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Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/lib/vsprintf.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | */ | |
7 | ||
8 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
9 | /* | |
10 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
11 | */ | |
12 | ||
7b9186f5 | 13 | /* |
1da177e4 LT |
14 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
15 | * - changed to provide snprintf and vsnprintf functions | |
16 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
17 | * - scnprintf and vscnprintf | |
18 | */ | |
19 | ||
20 | #include <stdarg.h> | |
ef27ac18 | 21 | #include <linux/build_bug.h> |
0d1d7a55 | 22 | #include <linux/clk.h> |
900cca29 | 23 | #include <linux/clk-provider.h> |
57f5677e | 24 | #include <linux/errname.h> |
8bc3bcc9 | 25 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
26 | #include <linux/types.h> |
27 | #include <linux/string.h> | |
28 | #include <linux/ctype.h> | |
29 | #include <linux/kernel.h> | |
0fe1ef24 | 30 | #include <linux/kallsyms.h> |
53809751 | 31 | #include <linux/math64.h> |
0fe1ef24 | 32 | #include <linux/uaccess.h> |
332d2e78 | 33 | #include <linux/ioport.h> |
4b6ccca7 | 34 | #include <linux/dcache.h> |
312b4e22 | 35 | #include <linux/cred.h> |
4d42c447 | 36 | #include <linux/rtc.h> |
2b1b0d66 | 37 | #include <linux/uuid.h> |
ce4fecf1 | 38 | #include <linux/of.h> |
8a27f7c9 | 39 | #include <net/addrconf.h> |
ad67b74d TH |
40 | #include <linux/siphash.h> |
41 | #include <linux/compiler.h> | |
a92eb762 | 42 | #include <linux/property.h> |
1031bc58 DM |
43 | #ifdef CONFIG_BLOCK |
44 | #include <linux/blkdev.h> | |
45 | #endif | |
1da177e4 | 46 | |
edf14cdb VB |
47 | #include "../mm/internal.h" /* For the trace_print_flags arrays */ |
48 | ||
4e57b681 | 49 | #include <asm/page.h> /* for PAGE_SIZE */ |
7c43d9a3 | 50 | #include <asm/byteorder.h> /* cpu_to_le16 */ |
1da177e4 | 51 | |
71dca95d | 52 | #include <linux/string_helpers.h> |
1dff46d6 | 53 | #include "kstrtox.h" |
aa46a63e | 54 | |
1da177e4 | 55 | /** |
922ac25c | 56 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
57 | * @cp: The start of the string |
58 | * @endp: A pointer to the end of the parsed string will be placed here | |
59 | * @base: The number base to use | |
462e4711 EZ |
60 | * |
61 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 62 | */ |
922ac25c | 63 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 64 | { |
1dff46d6 AD |
65 | unsigned long long result; |
66 | unsigned int rv; | |
aa46a63e | 67 | |
1dff46d6 AD |
68 | cp = _parse_integer_fixup_radix(cp, &base); |
69 | rv = _parse_integer(cp, base, &result); | |
70 | /* FIXME */ | |
71 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 72 | |
1da177e4 LT |
73 | if (endp) |
74 | *endp = (char *)cp; | |
7b9186f5 | 75 | |
1da177e4 LT |
76 | return result; |
77 | } | |
922ac25c | 78 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
79 | |
80 | /** | |
922ac25c | 81 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
82 | * @cp: The start of the string |
83 | * @endp: A pointer to the end of the parsed string will be placed here | |
84 | * @base: The number base to use | |
462e4711 EZ |
85 | * |
86 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 87 | */ |
922ac25c | 88 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 89 | { |
922ac25c | 90 | return simple_strtoull(cp, endp, base); |
1da177e4 | 91 | } |
922ac25c | 92 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
93 | |
94 | /** | |
922ac25c | 95 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
96 | * @cp: The start of the string |
97 | * @endp: A pointer to the end of the parsed string will be placed here | |
98 | * @base: The number base to use | |
462e4711 EZ |
99 | * |
100 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 101 | */ |
922ac25c | 102 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 103 | { |
922ac25c AGR |
104 | if (*cp == '-') |
105 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 106 | |
922ac25c | 107 | return simple_strtoul(cp, endp, base); |
1da177e4 | 108 | } |
922ac25c | 109 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
110 | |
111 | /** | |
112 | * simple_strtoll - convert a string to a signed long long | |
113 | * @cp: The start of the string | |
114 | * @endp: A pointer to the end of the parsed string will be placed here | |
115 | * @base: The number base to use | |
462e4711 EZ |
116 | * |
117 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 118 | */ |
22d27051 | 119 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 120 | { |
7b9186f5 | 121 | if (*cp == '-') |
22d27051 | 122 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 123 | |
22d27051 | 124 | return simple_strtoull(cp, endp, base); |
1da177e4 | 125 | } |
98d5ce0d | 126 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 127 | |
cf3b429b JP |
128 | static noinline_for_stack |
129 | int skip_atoi(const char **s) | |
1da177e4 | 130 | { |
7b9186f5 | 131 | int i = 0; |
1da177e4 | 132 | |
43e5b666 | 133 | do { |
1da177e4 | 134 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 135 | } while (isdigit(**s)); |
7b9186f5 | 136 | |
1da177e4 LT |
137 | return i; |
138 | } | |
139 | ||
7c43d9a3 RV |
140 | /* |
141 | * Decimal conversion is by far the most typical, and is used for | |
142 | * /proc and /sys data. This directly impacts e.g. top performance | |
143 | * with many processes running. We optimize it for speed by emitting | |
144 | * two characters at a time, using a 200 byte lookup table. This | |
145 | * roughly halves the number of multiplications compared to computing | |
146 | * the digits one at a time. Implementation strongly inspired by the | |
147 | * previous version, which in turn used ideas described at | |
148 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
149 | * from the author, Douglas W. Jones). | |
150 | * | |
151 | * It turns out there is precisely one 26 bit fixed-point | |
152 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
153 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
154 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
155 | * irrelevant for our purpose. | |
156 | * | |
157 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
158 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
159 | * | |
160 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
161 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
162 | * for all x <= 43698. | |
133fd9f5 | 163 | */ |
4277eedd | 164 | |
7c43d9a3 RV |
165 | static const u16 decpair[100] = { |
166 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
167 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
168 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
169 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
170 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
171 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
172 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
173 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
174 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
175 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
176 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
177 | #undef _ | |
178 | }; | |
179 | ||
180 | /* | |
181 | * This will print a single '0' even if r == 0, since we would | |
675cf53c RV |
182 | * immediately jump to out_r where two 0s would be written but only |
183 | * one of them accounted for in buf. This is needed by ip4_string | |
184 | * below. All other callers pass a non-zero value of r. | |
7c43d9a3 | 185 | */ |
cf3b429b | 186 | static noinline_for_stack |
7c43d9a3 | 187 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 188 | { |
7c43d9a3 RV |
189 | unsigned q; |
190 | ||
191 | /* 1 <= r < 10^8 */ | |
192 | if (r < 100) | |
193 | goto out_r; | |
194 | ||
195 | /* 100 <= r < 10^8 */ | |
196 | q = (r * (u64)0x28f5c29) >> 32; | |
197 | *((u16 *)buf) = decpair[r - 100*q]; | |
198 | buf += 2; | |
199 | ||
200 | /* 1 <= q < 10^6 */ | |
201 | if (q < 100) | |
202 | goto out_q; | |
203 | ||
204 | /* 100 <= q < 10^6 */ | |
205 | r = (q * (u64)0x28f5c29) >> 32; | |
206 | *((u16 *)buf) = decpair[q - 100*r]; | |
207 | buf += 2; | |
208 | ||
209 | /* 1 <= r < 10^4 */ | |
210 | if (r < 100) | |
211 | goto out_r; | |
212 | ||
213 | /* 100 <= r < 10^4 */ | |
214 | q = (r * 0x147b) >> 19; | |
215 | *((u16 *)buf) = decpair[r - 100*q]; | |
216 | buf += 2; | |
217 | out_q: | |
218 | /* 1 <= q < 100 */ | |
219 | r = q; | |
220 | out_r: | |
221 | /* 1 <= r < 100 */ | |
222 | *((u16 *)buf) = decpair[r]; | |
675cf53c | 223 | buf += r < 10 ? 1 : 2; |
4277eedd DV |
224 | return buf; |
225 | } | |
133fd9f5 | 226 | |
7c43d9a3 | 227 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 |
cf3b429b | 228 | static noinline_for_stack |
7c43d9a3 | 229 | char *put_dec_full8(char *buf, unsigned r) |
4277eedd | 230 | { |
133fd9f5 DV |
231 | unsigned q; |
232 | ||
7c43d9a3 RV |
233 | /* 0 <= r < 10^8 */ |
234 | q = (r * (u64)0x28f5c29) >> 32; | |
235 | *((u16 *)buf) = decpair[r - 100*q]; | |
236 | buf += 2; | |
4277eedd | 237 | |
7c43d9a3 RV |
238 | /* 0 <= q < 10^6 */ |
239 | r = (q * (u64)0x28f5c29) >> 32; | |
240 | *((u16 *)buf) = decpair[q - 100*r]; | |
241 | buf += 2; | |
7b9186f5 | 242 | |
7c43d9a3 RV |
243 | /* 0 <= r < 10^4 */ |
244 | q = (r * 0x147b) >> 19; | |
245 | *((u16 *)buf) = decpair[r - 100*q]; | |
246 | buf += 2; | |
133fd9f5 | 247 | |
7c43d9a3 RV |
248 | /* 0 <= q < 100 */ |
249 | *((u16 *)buf) = decpair[q]; | |
250 | buf += 2; | |
251 | return buf; | |
252 | } | |
133fd9f5 | 253 | |
7c43d9a3 | 254 | static noinline_for_stack |
133fd9f5 DV |
255 | char *put_dec(char *buf, unsigned long long n) |
256 | { | |
7c43d9a3 RV |
257 | if (n >= 100*1000*1000) |
258 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
259 | /* 1 <= n <= 1.6e11 */ | |
260 | if (n >= 100*1000*1000) | |
261 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
262 | /* 1 <= n < 1e8 */ | |
133fd9f5 | 263 | return put_dec_trunc8(buf, n); |
4277eedd | 264 | } |
133fd9f5 | 265 | |
7c43d9a3 | 266 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 |
133fd9f5 | 267 | |
7c43d9a3 RV |
268 | static void |
269 | put_dec_full4(char *buf, unsigned r) | |
4277eedd | 270 | { |
7c43d9a3 RV |
271 | unsigned q; |
272 | ||
273 | /* 0 <= r < 10^4 */ | |
274 | q = (r * 0x147b) >> 19; | |
275 | *((u16 *)buf) = decpair[r - 100*q]; | |
276 | buf += 2; | |
277 | /* 0 <= q < 100 */ | |
278 | *((u16 *)buf) = decpair[q]; | |
2359172a GS |
279 | } |
280 | ||
281 | /* | |
282 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
283 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
284 | * holds for all x < 1,128,869,999. The largest value this | |
285 | * helper will ever be asked to convert is 1,125,520,955. | |
7c43d9a3 | 286 | * (second call in the put_dec code, assuming n is all-ones). |
2359172a | 287 | */ |
7c43d9a3 | 288 | static noinline_for_stack |
2359172a GS |
289 | unsigned put_dec_helper4(char *buf, unsigned x) |
290 | { | |
291 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
292 | ||
293 | put_dec_full4(buf, x - q * 10000); | |
294 | return q; | |
4277eedd DV |
295 | } |
296 | ||
133fd9f5 DV |
297 | /* Based on code by Douglas W. Jones found at |
298 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
299 | * (with permission from the author). | |
300 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
301 | */ | |
302 | static | |
303 | char *put_dec(char *buf, unsigned long long n) | |
304 | { | |
305 | uint32_t d3, d2, d1, q, h; | |
306 | ||
307 | if (n < 100*1000*1000) | |
308 | return put_dec_trunc8(buf, n); | |
309 | ||
310 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
311 | h = (n >> 32); | |
312 | d2 = (h ) & 0xffff; | |
313 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
314 | ||
7c43d9a3 RV |
315 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 |
316 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
133fd9f5 | 317 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
2359172a GS |
318 | q = put_dec_helper4(buf, q); |
319 | ||
320 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
321 | q = put_dec_helper4(buf+4, q); | |
322 | ||
323 | q += 4749 * d3 + 42 * d2; | |
324 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 325 | |
2359172a GS |
326 | q += 281 * d3; |
327 | buf += 12; | |
328 | if (q) | |
329 | buf = put_dec_trunc8(buf, q); | |
330 | else while (buf[-1] == '0') | |
133fd9f5 DV |
331 | --buf; |
332 | ||
333 | return buf; | |
334 | } | |
335 | ||
336 | #endif | |
337 | ||
1ac101a5 KH |
338 | /* |
339 | * Convert passed number to decimal string. | |
340 | * Returns the length of string. On buffer overflow, returns 0. | |
341 | * | |
342 | * If speed is not important, use snprintf(). It's easy to read the code. | |
343 | */ | |
d1be35cb | 344 | int num_to_str(char *buf, int size, unsigned long long num, unsigned int width) |
1ac101a5 | 345 | { |
7c43d9a3 RV |
346 | /* put_dec requires 2-byte alignment of the buffer. */ |
347 | char tmp[sizeof(num) * 3] __aligned(2); | |
1ac101a5 KH |
348 | int idx, len; |
349 | ||
133fd9f5 DV |
350 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
351 | if (num <= 9) { | |
352 | tmp[0] = '0' + num; | |
353 | len = 1; | |
354 | } else { | |
355 | len = put_dec(tmp, num) - tmp; | |
356 | } | |
1ac101a5 | 357 | |
d1be35cb | 358 | if (len > size || width > size) |
1ac101a5 | 359 | return 0; |
d1be35cb AV |
360 | |
361 | if (width > len) { | |
362 | width = width - len; | |
363 | for (idx = 0; idx < width; idx++) | |
364 | buf[idx] = ' '; | |
365 | } else { | |
366 | width = 0; | |
367 | } | |
368 | ||
1ac101a5 | 369 | for (idx = 0; idx < len; ++idx) |
d1be35cb AV |
370 | buf[idx + width] = tmp[len - idx - 1]; |
371 | ||
372 | return len + width; | |
1ac101a5 KH |
373 | } |
374 | ||
51be17df | 375 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 376 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
377 | #define PLUS 4 /* show plus */ |
378 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 379 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
380 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
381 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 382 | |
fef20d9c FW |
383 | enum format_type { |
384 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 385 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
386 | FORMAT_TYPE_PRECISION, |
387 | FORMAT_TYPE_CHAR, | |
388 | FORMAT_TYPE_STR, | |
389 | FORMAT_TYPE_PTR, | |
390 | FORMAT_TYPE_PERCENT_CHAR, | |
391 | FORMAT_TYPE_INVALID, | |
392 | FORMAT_TYPE_LONG_LONG, | |
393 | FORMAT_TYPE_ULONG, | |
394 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
395 | FORMAT_TYPE_UBYTE, |
396 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
397 | FORMAT_TYPE_USHORT, |
398 | FORMAT_TYPE_SHORT, | |
399 | FORMAT_TYPE_UINT, | |
400 | FORMAT_TYPE_INT, | |
fef20d9c FW |
401 | FORMAT_TYPE_SIZE_T, |
402 | FORMAT_TYPE_PTRDIFF | |
403 | }; | |
404 | ||
405 | struct printf_spec { | |
d0484193 RV |
406 | unsigned int type:8; /* format_type enum */ |
407 | signed int field_width:24; /* width of output field */ | |
408 | unsigned int flags:8; /* flags to number() */ | |
409 | unsigned int base:8; /* number base, 8, 10 or 16 only */ | |
410 | signed int precision:16; /* # of digits/chars */ | |
411 | } __packed; | |
ef27ac18 RV |
412 | static_assert(sizeof(struct printf_spec) == 8); |
413 | ||
4d72ba01 RV |
414 | #define FIELD_WIDTH_MAX ((1 << 23) - 1) |
415 | #define PRECISION_MAX ((1 << 15) - 1) | |
fef20d9c | 416 | |
cf3b429b JP |
417 | static noinline_for_stack |
418 | char *number(char *buf, char *end, unsigned long long num, | |
419 | struct printf_spec spec) | |
1da177e4 | 420 | { |
7c43d9a3 RV |
421 | /* put_dec requires 2-byte alignment of the buffer. */ |
422 | char tmp[3 * sizeof(num)] __aligned(2); | |
9b706aee DV |
423 | char sign; |
424 | char locase; | |
fef20d9c | 425 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 426 | int i; |
7c203422 | 427 | bool is_zero = num == 0LL; |
1c7a8e62 RV |
428 | int field_width = spec.field_width; |
429 | int precision = spec.precision; | |
1da177e4 | 430 | |
9b706aee DV |
431 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
432 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
433 | locase = (spec.flags & SMALL); |
434 | if (spec.flags & LEFT) | |
435 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 436 | sign = 0; |
fef20d9c | 437 | if (spec.flags & SIGN) { |
7b9186f5 | 438 | if ((signed long long)num < 0) { |
1da177e4 | 439 | sign = '-'; |
7b9186f5 | 440 | num = -(signed long long)num; |
1c7a8e62 | 441 | field_width--; |
fef20d9c | 442 | } else if (spec.flags & PLUS) { |
1da177e4 | 443 | sign = '+'; |
1c7a8e62 | 444 | field_width--; |
fef20d9c | 445 | } else if (spec.flags & SPACE) { |
1da177e4 | 446 | sign = ' '; |
1c7a8e62 | 447 | field_width--; |
1da177e4 LT |
448 | } |
449 | } | |
b39a7340 | 450 | if (need_pfx) { |
fef20d9c | 451 | if (spec.base == 16) |
1c7a8e62 | 452 | field_width -= 2; |
7c203422 | 453 | else if (!is_zero) |
1c7a8e62 | 454 | field_width--; |
1da177e4 | 455 | } |
b39a7340 DV |
456 | |
457 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 458 | i = 0; |
133fd9f5 | 459 | if (num < spec.base) |
3ea8d440 | 460 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
461 | else if (spec.base != 10) { /* 8 or 16 */ |
462 | int mask = spec.base - 1; | |
b39a7340 | 463 | int shift = 3; |
7b9186f5 AGR |
464 | |
465 | if (spec.base == 16) | |
466 | shift = 4; | |
b39a7340 | 467 | do { |
3ea8d440 | 468 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
469 | num >>= shift; |
470 | } while (num); | |
4277eedd DV |
471 | } else { /* base 10 */ |
472 | i = put_dec(tmp, num) - tmp; | |
473 | } | |
b39a7340 DV |
474 | |
475 | /* printing 100 using %2d gives "100", not "00" */ | |
1c7a8e62 RV |
476 | if (i > precision) |
477 | precision = i; | |
b39a7340 | 478 | /* leading space padding */ |
1c7a8e62 | 479 | field_width -= precision; |
51be17df | 480 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
1c7a8e62 | 481 | while (--field_width >= 0) { |
f796937a | 482 | if (buf < end) |
1da177e4 LT |
483 | *buf = ' '; |
484 | ++buf; | |
485 | } | |
486 | } | |
b39a7340 | 487 | /* sign */ |
1da177e4 | 488 | if (sign) { |
f796937a | 489 | if (buf < end) |
1da177e4 LT |
490 | *buf = sign; |
491 | ++buf; | |
492 | } | |
b39a7340 DV |
493 | /* "0x" / "0" prefix */ |
494 | if (need_pfx) { | |
7c203422 PC |
495 | if (spec.base == 16 || !is_zero) { |
496 | if (buf < end) | |
497 | *buf = '0'; | |
498 | ++buf; | |
499 | } | |
fef20d9c | 500 | if (spec.base == 16) { |
f796937a | 501 | if (buf < end) |
9b706aee | 502 | *buf = ('X' | locase); |
1da177e4 LT |
503 | ++buf; |
504 | } | |
505 | } | |
b39a7340 | 506 | /* zero or space padding */ |
fef20d9c | 507 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
508 | char c = ' ' + (spec.flags & ZEROPAD); |
509 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
1c7a8e62 | 510 | while (--field_width >= 0) { |
f796937a | 511 | if (buf < end) |
1da177e4 LT |
512 | *buf = c; |
513 | ++buf; | |
514 | } | |
515 | } | |
b39a7340 | 516 | /* hmm even more zero padding? */ |
1c7a8e62 | 517 | while (i <= --precision) { |
f796937a | 518 | if (buf < end) |
1da177e4 LT |
519 | *buf = '0'; |
520 | ++buf; | |
521 | } | |
b39a7340 DV |
522 | /* actual digits of result */ |
523 | while (--i >= 0) { | |
f796937a | 524 | if (buf < end) |
1da177e4 LT |
525 | *buf = tmp[i]; |
526 | ++buf; | |
527 | } | |
b39a7340 | 528 | /* trailing space padding */ |
1c7a8e62 | 529 | while (--field_width >= 0) { |
f796937a | 530 | if (buf < end) |
1da177e4 LT |
531 | *buf = ' '; |
532 | ++buf; | |
533 | } | |
7b9186f5 | 534 | |
1da177e4 LT |
535 | return buf; |
536 | } | |
537 | ||
3cab1e71 AS |
538 | static noinline_for_stack |
539 | char *special_hex_number(char *buf, char *end, unsigned long long num, int size) | |
540 | { | |
541 | struct printf_spec spec; | |
542 | ||
543 | spec.type = FORMAT_TYPE_PTR; | |
544 | spec.field_width = 2 + 2 * size; /* 0x + hex */ | |
545 | spec.flags = SPECIAL | SMALL | ZEROPAD; | |
546 | spec.base = 16; | |
547 | spec.precision = -1; | |
548 | ||
549 | return number(buf, end, num, spec); | |
550 | } | |
551 | ||
cfccde04 | 552 | static void move_right(char *buf, char *end, unsigned len, unsigned spaces) |
4b6ccca7 AV |
553 | { |
554 | size_t size; | |
555 | if (buf >= end) /* nowhere to put anything */ | |
556 | return; | |
557 | size = end - buf; | |
558 | if (size <= spaces) { | |
559 | memset(buf, ' ', size); | |
560 | return; | |
561 | } | |
562 | if (len) { | |
563 | if (len > size - spaces) | |
564 | len = size - spaces; | |
565 | memmove(buf + spaces, buf, len); | |
566 | } | |
567 | memset(buf, ' ', spaces); | |
568 | } | |
569 | ||
cfccde04 RV |
570 | /* |
571 | * Handle field width padding for a string. | |
572 | * @buf: current buffer position | |
573 | * @n: length of string | |
574 | * @end: end of output buffer | |
575 | * @spec: for field width and flags | |
576 | * Returns: new buffer position after padding. | |
577 | */ | |
578 | static noinline_for_stack | |
579 | char *widen_string(char *buf, int n, char *end, struct printf_spec spec) | |
580 | { | |
581 | unsigned spaces; | |
582 | ||
583 | if (likely(n >= spec.field_width)) | |
584 | return buf; | |
585 | /* we want to pad the sucker */ | |
586 | spaces = spec.field_width - n; | |
587 | if (!(spec.flags & LEFT)) { | |
588 | move_right(buf - n, end, n, spaces); | |
589 | return buf + spaces; | |
590 | } | |
591 | while (spaces--) { | |
592 | if (buf < end) | |
593 | *buf = ' '; | |
594 | ++buf; | |
595 | } | |
596 | return buf; | |
597 | } | |
598 | ||
d529ac41 PM |
599 | /* Handle string from a well known address. */ |
600 | static char *string_nocheck(char *buf, char *end, const char *s, | |
601 | struct printf_spec spec) | |
95508cfa | 602 | { |
34fc8b90 | 603 | int len = 0; |
b314dd49 | 604 | int lim = spec.precision; |
95508cfa | 605 | |
34fc8b90 RV |
606 | while (lim--) { |
607 | char c = *s++; | |
608 | if (!c) | |
609 | break; | |
95508cfa | 610 | if (buf < end) |
34fc8b90 | 611 | *buf = c; |
95508cfa | 612 | ++buf; |
34fc8b90 | 613 | ++len; |
95508cfa | 614 | } |
34fc8b90 | 615 | return widen_string(buf, len, end, spec); |
95508cfa RV |
616 | } |
617 | ||
57f5677e RV |
618 | static char *err_ptr(char *buf, char *end, void *ptr, |
619 | struct printf_spec spec) | |
620 | { | |
621 | int err = PTR_ERR(ptr); | |
622 | const char *sym = errname(err); | |
623 | ||
624 | if (sym) | |
625 | return string_nocheck(buf, end, sym, spec); | |
626 | ||
627 | /* | |
628 | * Somebody passed ERR_PTR(-1234) or some other non-existing | |
629 | * Efoo - or perhaps CONFIG_SYMBOLIC_ERRNAME=n. Fall back to | |
630 | * printing it as its decimal representation. | |
631 | */ | |
632 | spec.flags |= SIGN; | |
633 | spec.base = 10; | |
634 | return number(buf, end, err, spec); | |
635 | } | |
636 | ||
c8c3b584 PM |
637 | /* Be careful: error messages must fit into the given buffer. */ |
638 | static char *error_string(char *buf, char *end, const char *s, | |
639 | struct printf_spec spec) | |
640 | { | |
641 | /* | |
642 | * Hard limit to avoid a completely insane messages. It actually | |
643 | * works pretty well because most error messages are in | |
644 | * the many pointer format modifiers. | |
645 | */ | |
646 | if (spec.precision == -1) | |
647 | spec.precision = 2 * sizeof(void *); | |
648 | ||
649 | return string_nocheck(buf, end, s, spec); | |
650 | } | |
651 | ||
3e5903eb | 652 | /* |
2ac5a3bf PM |
653 | * Do not call any complex external code here. Nested printk()/vsprintf() |
654 | * might cause infinite loops. Failures might break printk() and would | |
655 | * be hard to debug. | |
3e5903eb PM |
656 | */ |
657 | static const char *check_pointer_msg(const void *ptr) | |
658 | { | |
3e5903eb PM |
659 | if (!ptr) |
660 | return "(null)"; | |
661 | ||
2ac5a3bf | 662 | if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr)) |
3e5903eb PM |
663 | return "(efault)"; |
664 | ||
665 | return NULL; | |
666 | } | |
667 | ||
668 | static int check_pointer(char **buf, char *end, const void *ptr, | |
669 | struct printf_spec spec) | |
670 | { | |
671 | const char *err_msg; | |
672 | ||
673 | err_msg = check_pointer_msg(ptr); | |
674 | if (err_msg) { | |
c8c3b584 | 675 | *buf = error_string(*buf, end, err_msg, spec); |
3e5903eb PM |
676 | return -EFAULT; |
677 | } | |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
9073dac1 | 682 | static noinline_for_stack |
d529ac41 PM |
683 | char *string(char *buf, char *end, const char *s, |
684 | struct printf_spec spec) | |
685 | { | |
3e5903eb PM |
686 | if (check_pointer(&buf, end, s, spec)) |
687 | return buf; | |
d529ac41 PM |
688 | |
689 | return string_nocheck(buf, end, s, spec); | |
690 | } | |
691 | ||
ce9d3ece Y |
692 | static char *pointer_string(char *buf, char *end, |
693 | const void *ptr, | |
694 | struct printf_spec spec) | |
9073dac1 GU |
695 | { |
696 | spec.base = 16; | |
697 | spec.flags |= SMALL; | |
698 | if (spec.field_width == -1) { | |
699 | spec.field_width = 2 * sizeof(ptr); | |
700 | spec.flags |= ZEROPAD; | |
701 | } | |
702 | ||
703 | return number(buf, end, (unsigned long int)ptr, spec); | |
704 | } | |
705 | ||
706 | /* Make pointers available for printing early in the boot sequence. */ | |
707 | static int debug_boot_weak_hash __ro_after_init; | |
708 | ||
709 | static int __init debug_boot_weak_hash_enable(char *str) | |
710 | { | |
711 | debug_boot_weak_hash = 1; | |
712 | pr_info("debug_boot_weak_hash enabled\n"); | |
713 | return 0; | |
714 | } | |
715 | early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable); | |
716 | ||
717 | static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key); | |
718 | static siphash_key_t ptr_key __read_mostly; | |
719 | ||
720 | static void enable_ptr_key_workfn(struct work_struct *work) | |
721 | { | |
722 | get_random_bytes(&ptr_key, sizeof(ptr_key)); | |
723 | /* Needs to run from preemptible context */ | |
724 | static_branch_disable(¬_filled_random_ptr_key); | |
725 | } | |
726 | ||
727 | static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn); | |
728 | ||
729 | static void fill_random_ptr_key(struct random_ready_callback *unused) | |
730 | { | |
731 | /* This may be in an interrupt handler. */ | |
732 | queue_work(system_unbound_wq, &enable_ptr_key_work); | |
733 | } | |
734 | ||
735 | static struct random_ready_callback random_ready = { | |
736 | .func = fill_random_ptr_key | |
737 | }; | |
738 | ||
739 | static int __init initialize_ptr_random(void) | |
740 | { | |
741 | int key_size = sizeof(ptr_key); | |
742 | int ret; | |
743 | ||
744 | /* Use hw RNG if available. */ | |
745 | if (get_random_bytes_arch(&ptr_key, key_size) == key_size) { | |
746 | static_branch_disable(¬_filled_random_ptr_key); | |
747 | return 0; | |
748 | } | |
749 | ||
750 | ret = add_random_ready_callback(&random_ready); | |
751 | if (!ret) { | |
752 | return 0; | |
753 | } else if (ret == -EALREADY) { | |
754 | /* This is in preemptible context */ | |
755 | enable_ptr_key_workfn(&enable_ptr_key_work); | |
756 | return 0; | |
757 | } | |
758 | ||
759 | return ret; | |
760 | } | |
761 | early_initcall(initialize_ptr_random); | |
762 | ||
763 | /* Maps a pointer to a 32 bit unique identifier. */ | |
e4dcad20 JFG |
764 | static inline int __ptr_to_hashval(const void *ptr, unsigned long *hashval_out) |
765 | { | |
766 | unsigned long hashval; | |
767 | ||
768 | if (static_branch_unlikely(¬_filled_random_ptr_key)) | |
769 | return -EAGAIN; | |
770 | ||
771 | #ifdef CONFIG_64BIT | |
772 | hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key); | |
773 | /* | |
774 | * Mask off the first 32 bits, this makes explicit that we have | |
775 | * modified the address (and 32 bits is plenty for a unique ID). | |
776 | */ | |
777 | hashval = hashval & 0xffffffff; | |
778 | #else | |
779 | hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key); | |
780 | #endif | |
781 | *hashval_out = hashval; | |
782 | return 0; | |
783 | } | |
784 | ||
785 | int ptr_to_hashval(const void *ptr, unsigned long *hashval_out) | |
786 | { | |
787 | return __ptr_to_hashval(ptr, hashval_out); | |
788 | } | |
789 | ||
9073dac1 GU |
790 | static char *ptr_to_id(char *buf, char *end, const void *ptr, |
791 | struct printf_spec spec) | |
792 | { | |
793 | const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)"; | |
794 | unsigned long hashval; | |
e4dcad20 | 795 | int ret; |
9073dac1 GU |
796 | |
797 | /* When debugging early boot use non-cryptographically secure hash. */ | |
798 | if (unlikely(debug_boot_weak_hash)) { | |
799 | hashval = hash_long((unsigned long)ptr, 32); | |
800 | return pointer_string(buf, end, (const void *)hashval, spec); | |
801 | } | |
802 | ||
e4dcad20 JFG |
803 | ret = __ptr_to_hashval(ptr, &hashval); |
804 | if (ret) { | |
9073dac1 GU |
805 | spec.field_width = 2 * sizeof(ptr); |
806 | /* string length must be less than default_width */ | |
c8c3b584 | 807 | return error_string(buf, end, str, spec); |
9073dac1 GU |
808 | } |
809 | ||
9073dac1 GU |
810 | return pointer_string(buf, end, (const void *)hashval, spec); |
811 | } | |
812 | ||
6eea242f PM |
813 | int kptr_restrict __read_mostly; |
814 | ||
815 | static noinline_for_stack | |
816 | char *restricted_pointer(char *buf, char *end, const void *ptr, | |
817 | struct printf_spec spec) | |
818 | { | |
819 | switch (kptr_restrict) { | |
820 | case 0: | |
1ac2f978 PM |
821 | /* Handle as %p, hash and do _not_ leak addresses. */ |
822 | return ptr_to_id(buf, end, ptr, spec); | |
6eea242f PM |
823 | case 1: { |
824 | const struct cred *cred; | |
825 | ||
826 | /* | |
827 | * kptr_restrict==1 cannot be used in IRQ context | |
828 | * because its test for CAP_SYSLOG would be meaningless. | |
829 | */ | |
830 | if (in_irq() || in_serving_softirq() || in_nmi()) { | |
831 | if (spec.field_width == -1) | |
832 | spec.field_width = 2 * sizeof(ptr); | |
c8c3b584 | 833 | return error_string(buf, end, "pK-error", spec); |
6eea242f PM |
834 | } |
835 | ||
836 | /* | |
837 | * Only print the real pointer value if the current | |
838 | * process has CAP_SYSLOG and is running with the | |
839 | * same credentials it started with. This is because | |
840 | * access to files is checked at open() time, but %pK | |
841 | * checks permission at read() time. We don't want to | |
842 | * leak pointer values if a binary opens a file using | |
843 | * %pK and then elevates privileges before reading it. | |
844 | */ | |
845 | cred = current_cred(); | |
846 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
847 | !uid_eq(cred->euid, cred->uid) || | |
848 | !gid_eq(cred->egid, cred->gid)) | |
849 | ptr = NULL; | |
850 | break; | |
851 | } | |
852 | case 2: | |
853 | default: | |
854 | /* Always print 0's for %pK */ | |
855 | ptr = NULL; | |
856 | break; | |
857 | } | |
858 | ||
859 | return pointer_string(buf, end, ptr, spec); | |
860 | } | |
861 | ||
4b6ccca7 AV |
862 | static noinline_for_stack |
863 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
864 | const char *fmt) | |
865 | { | |
866 | const char *array[4], *s; | |
867 | const struct dentry *p; | |
868 | int depth; | |
869 | int i, n; | |
870 | ||
871 | switch (fmt[1]) { | |
872 | case '2': case '3': case '4': | |
873 | depth = fmt[1] - '0'; | |
874 | break; | |
875 | default: | |
876 | depth = 1; | |
877 | } | |
878 | ||
879 | rcu_read_lock(); | |
880 | for (i = 0; i < depth; i++, d = p) { | |
3e5903eb PM |
881 | if (check_pointer(&buf, end, d, spec)) { |
882 | rcu_read_unlock(); | |
883 | return buf; | |
884 | } | |
885 | ||
6aa7de05 MR |
886 | p = READ_ONCE(d->d_parent); |
887 | array[i] = READ_ONCE(d->d_name.name); | |
4b6ccca7 AV |
888 | if (p == d) { |
889 | if (i) | |
890 | array[i] = ""; | |
891 | i++; | |
892 | break; | |
893 | } | |
894 | } | |
895 | s = array[--i]; | |
896 | for (n = 0; n != spec.precision; n++, buf++) { | |
897 | char c = *s++; | |
898 | if (!c) { | |
899 | if (!i) | |
900 | break; | |
901 | c = '/'; | |
902 | s = array[--i]; | |
903 | } | |
904 | if (buf < end) | |
905 | *buf = c; | |
906 | } | |
907 | rcu_read_unlock(); | |
cfccde04 | 908 | return widen_string(buf, n, end, spec); |
4b6ccca7 AV |
909 | } |
910 | ||
36594b31 JH |
911 | static noinline_for_stack |
912 | char *file_dentry_name(char *buf, char *end, const struct file *f, | |
913 | struct printf_spec spec, const char *fmt) | |
914 | { | |
915 | if (check_pointer(&buf, end, f, spec)) | |
916 | return buf; | |
917 | ||
918 | return dentry_name(buf, end, f->f_path.dentry, spec, fmt); | |
919 | } | |
1031bc58 DM |
920 | #ifdef CONFIG_BLOCK |
921 | static noinline_for_stack | |
922 | char *bdev_name(char *buf, char *end, struct block_device *bdev, | |
923 | struct printf_spec spec, const char *fmt) | |
924 | { | |
3e5903eb PM |
925 | struct gendisk *hd; |
926 | ||
927 | if (check_pointer(&buf, end, bdev, spec)) | |
928 | return buf; | |
929 | ||
930 | hd = bdev->bd_disk; | |
1031bc58 DM |
931 | buf = string(buf, end, hd->disk_name, spec); |
932 | if (bdev->bd_part->partno) { | |
933 | if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { | |
934 | if (buf < end) | |
935 | *buf = 'p'; | |
936 | buf++; | |
937 | } | |
938 | buf = number(buf, end, bdev->bd_part->partno, spec); | |
939 | } | |
940 | return buf; | |
941 | } | |
942 | #endif | |
943 | ||
cf3b429b JP |
944 | static noinline_for_stack |
945 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 946 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 947 | { |
b0d33c2b | 948 | unsigned long value; |
0fe1ef24 LT |
949 | #ifdef CONFIG_KALLSYMS |
950 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
951 | #endif |
952 | ||
953 | if (fmt[1] == 'R') | |
954 | ptr = __builtin_extract_return_addr(ptr); | |
955 | value = (unsigned long)ptr; | |
956 | ||
957 | #ifdef CONFIG_KALLSYMS | |
958 | if (*fmt == 'B') | |
0f77a8d3 | 959 | sprint_backtrace(sym, value); |
9af77064 | 960 | else if (*fmt != 's') |
0c8b946e FW |
961 | sprint_symbol(sym, value); |
962 | else | |
4796dd20 | 963 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 964 | |
d529ac41 | 965 | return string_nocheck(buf, end, sym, spec); |
0fe1ef24 | 966 | #else |
3cab1e71 | 967 | return special_hex_number(buf, end, value, sizeof(void *)); |
0fe1ef24 LT |
968 | #endif |
969 | } | |
970 | ||
abd4fe62 AS |
971 | static const struct printf_spec default_str_spec = { |
972 | .field_width = -1, | |
973 | .precision = -1, | |
974 | }; | |
975 | ||
54433973 AS |
976 | static const struct printf_spec default_flag_spec = { |
977 | .base = 16, | |
978 | .precision = -1, | |
979 | .flags = SPECIAL | SMALL, | |
980 | }; | |
981 | ||
ce0b4910 AS |
982 | static const struct printf_spec default_dec_spec = { |
983 | .base = 10, | |
984 | .precision = -1, | |
985 | }; | |
986 | ||
4d42c447 AS |
987 | static const struct printf_spec default_dec02_spec = { |
988 | .base = 10, | |
989 | .field_width = 2, | |
990 | .precision = -1, | |
991 | .flags = ZEROPAD, | |
992 | }; | |
993 | ||
994 | static const struct printf_spec default_dec04_spec = { | |
995 | .base = 10, | |
996 | .field_width = 4, | |
997 | .precision = -1, | |
998 | .flags = ZEROPAD, | |
999 | }; | |
1000 | ||
cf3b429b JP |
1001 | static noinline_for_stack |
1002 | char *resource_string(char *buf, char *end, struct resource *res, | |
1003 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
1004 | { |
1005 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 1006 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
1007 | #endif |
1008 | ||
1009 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 1010 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 1011 | #endif |
4da0b66c | 1012 | static const struct printf_spec io_spec = { |
fef20d9c | 1013 | .base = 16, |
4da0b66c | 1014 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
1015 | .precision = -1, |
1016 | .flags = SPECIAL | SMALL | ZEROPAD, | |
1017 | }; | |
4da0b66c BH |
1018 | static const struct printf_spec mem_spec = { |
1019 | .base = 16, | |
1020 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
1021 | .precision = -1, | |
1022 | .flags = SPECIAL | SMALL | ZEROPAD, | |
1023 | }; | |
0f4050c7 BH |
1024 | static const struct printf_spec bus_spec = { |
1025 | .base = 16, | |
1026 | .field_width = 2, | |
1027 | .precision = -1, | |
1028 | .flags = SMALL | ZEROPAD, | |
1029 | }; | |
4da0b66c | 1030 | static const struct printf_spec str_spec = { |
fd95541e BH |
1031 | .field_width = -1, |
1032 | .precision = 10, | |
1033 | .flags = LEFT, | |
1034 | }; | |
c7dabef8 BH |
1035 | |
1036 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
1037 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
1038 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
1039 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 1040 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
1041 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
1042 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
1043 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
1044 | ||
332d2e78 | 1045 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 1046 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 1047 | const struct printf_spec *specp; |
332d2e78 | 1048 | |
3e5903eb PM |
1049 | if (check_pointer(&buf, end, res, spec)) |
1050 | return buf; | |
1051 | ||
332d2e78 | 1052 | *p++ = '['; |
4da0b66c | 1053 | if (res->flags & IORESOURCE_IO) { |
d529ac41 | 1054 | p = string_nocheck(p, pend, "io ", str_spec); |
4da0b66c BH |
1055 | specp = &io_spec; |
1056 | } else if (res->flags & IORESOURCE_MEM) { | |
d529ac41 | 1057 | p = string_nocheck(p, pend, "mem ", str_spec); |
4da0b66c BH |
1058 | specp = &mem_spec; |
1059 | } else if (res->flags & IORESOURCE_IRQ) { | |
d529ac41 | 1060 | p = string_nocheck(p, pend, "irq ", str_spec); |
ce0b4910 | 1061 | specp = &default_dec_spec; |
4da0b66c | 1062 | } else if (res->flags & IORESOURCE_DMA) { |
d529ac41 | 1063 | p = string_nocheck(p, pend, "dma ", str_spec); |
ce0b4910 | 1064 | specp = &default_dec_spec; |
0f4050c7 | 1065 | } else if (res->flags & IORESOURCE_BUS) { |
d529ac41 | 1066 | p = string_nocheck(p, pend, "bus ", str_spec); |
0f4050c7 | 1067 | specp = &bus_spec; |
4da0b66c | 1068 | } else { |
d529ac41 | 1069 | p = string_nocheck(p, pend, "??? ", str_spec); |
4da0b66c | 1070 | specp = &mem_spec; |
c7dabef8 | 1071 | decode = 0; |
fd95541e | 1072 | } |
d19cb803 | 1073 | if (decode && res->flags & IORESOURCE_UNSET) { |
d529ac41 | 1074 | p = string_nocheck(p, pend, "size ", str_spec); |
d19cb803 BH |
1075 | p = number(p, pend, resource_size(res), *specp); |
1076 | } else { | |
1077 | p = number(p, pend, res->start, *specp); | |
1078 | if (res->start != res->end) { | |
1079 | *p++ = '-'; | |
1080 | p = number(p, pend, res->end, *specp); | |
1081 | } | |
c91d3376 | 1082 | } |
c7dabef8 | 1083 | if (decode) { |
fd95541e | 1084 | if (res->flags & IORESOURCE_MEM_64) |
d529ac41 | 1085 | p = string_nocheck(p, pend, " 64bit", str_spec); |
fd95541e | 1086 | if (res->flags & IORESOURCE_PREFETCH) |
d529ac41 | 1087 | p = string_nocheck(p, pend, " pref", str_spec); |
9d7cca04 | 1088 | if (res->flags & IORESOURCE_WINDOW) |
d529ac41 | 1089 | p = string_nocheck(p, pend, " window", str_spec); |
fd95541e | 1090 | if (res->flags & IORESOURCE_DISABLED) |
d529ac41 | 1091 | p = string_nocheck(p, pend, " disabled", str_spec); |
c7dabef8 | 1092 | } else { |
d529ac41 | 1093 | p = string_nocheck(p, pend, " flags ", str_spec); |
54433973 | 1094 | p = number(p, pend, res->flags, default_flag_spec); |
fd95541e | 1095 | } |
332d2e78 | 1096 | *p++ = ']'; |
c7dabef8 | 1097 | *p = '\0'; |
332d2e78 | 1098 | |
d529ac41 | 1099 | return string_nocheck(buf, end, sym, spec); |
332d2e78 LT |
1100 | } |
1101 | ||
31550a16 AS |
1102 | static noinline_for_stack |
1103 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1104 | const char *fmt) | |
1105 | { | |
360603a1 | 1106 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
1107 | negative value, fallback to the default */ |
1108 | char separator; | |
1109 | ||
1110 | if (spec.field_width == 0) | |
1111 | /* nothing to print */ | |
1112 | return buf; | |
1113 | ||
3e5903eb PM |
1114 | if (check_pointer(&buf, end, addr, spec)) |
1115 | return buf; | |
31550a16 AS |
1116 | |
1117 | switch (fmt[1]) { | |
1118 | case 'C': | |
1119 | separator = ':'; | |
1120 | break; | |
1121 | case 'D': | |
1122 | separator = '-'; | |
1123 | break; | |
1124 | case 'N': | |
1125 | separator = 0; | |
1126 | break; | |
1127 | default: | |
1128 | separator = ' '; | |
1129 | break; | |
1130 | } | |
1131 | ||
1132 | if (spec.field_width > 0) | |
1133 | len = min_t(int, spec.field_width, 64); | |
1134 | ||
9c98f235 RV |
1135 | for (i = 0; i < len; ++i) { |
1136 | if (buf < end) | |
1137 | *buf = hex_asc_hi(addr[i]); | |
1138 | ++buf; | |
1139 | if (buf < end) | |
1140 | *buf = hex_asc_lo(addr[i]); | |
1141 | ++buf; | |
31550a16 | 1142 | |
9c98f235 RV |
1143 | if (separator && i != len - 1) { |
1144 | if (buf < end) | |
1145 | *buf = separator; | |
1146 | ++buf; | |
1147 | } | |
31550a16 AS |
1148 | } |
1149 | ||
1150 | return buf; | |
1151 | } | |
1152 | ||
dbc760bc TH |
1153 | static noinline_for_stack |
1154 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
1155 | struct printf_spec spec, const char *fmt) | |
1156 | { | |
1157 | const int CHUNKSZ = 32; | |
1158 | int nr_bits = max_t(int, spec.field_width, 0); | |
1159 | int i, chunksz; | |
1160 | bool first = true; | |
1161 | ||
3e5903eb PM |
1162 | if (check_pointer(&buf, end, bitmap, spec)) |
1163 | return buf; | |
1164 | ||
dbc760bc TH |
1165 | /* reused to print numbers */ |
1166 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
1167 | ||
1168 | chunksz = nr_bits & (CHUNKSZ - 1); | |
1169 | if (chunksz == 0) | |
1170 | chunksz = CHUNKSZ; | |
1171 | ||
1172 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
1173 | for (; i >= 0; i -= CHUNKSZ) { | |
1174 | u32 chunkmask, val; | |
1175 | int word, bit; | |
1176 | ||
1177 | chunkmask = ((1ULL << chunksz) - 1); | |
1178 | word = i / BITS_PER_LONG; | |
1179 | bit = i % BITS_PER_LONG; | |
1180 | val = (bitmap[word] >> bit) & chunkmask; | |
1181 | ||
1182 | if (!first) { | |
1183 | if (buf < end) | |
1184 | *buf = ','; | |
1185 | buf++; | |
1186 | } | |
1187 | first = false; | |
1188 | ||
1189 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
1190 | buf = number(buf, end, val, spec); | |
1191 | ||
1192 | chunksz = CHUNKSZ; | |
1193 | } | |
1194 | return buf; | |
1195 | } | |
1196 | ||
1197 | static noinline_for_stack | |
1198 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
1199 | struct printf_spec spec, const char *fmt) | |
1200 | { | |
1201 | int nr_bits = max_t(int, spec.field_width, 0); | |
1202 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
1203 | int cur, rbot, rtop; | |
1204 | bool first = true; | |
1205 | ||
3e5903eb PM |
1206 | if (check_pointer(&buf, end, bitmap, spec)) |
1207 | return buf; | |
1208 | ||
dbc760bc TH |
1209 | rbot = cur = find_first_bit(bitmap, nr_bits); |
1210 | while (cur < nr_bits) { | |
1211 | rtop = cur; | |
1212 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
1213 | if (cur < nr_bits && cur <= rtop + 1) | |
1214 | continue; | |
1215 | ||
1216 | if (!first) { | |
1217 | if (buf < end) | |
1218 | *buf = ','; | |
1219 | buf++; | |
1220 | } | |
1221 | first = false; | |
1222 | ||
ce0b4910 | 1223 | buf = number(buf, end, rbot, default_dec_spec); |
dbc760bc TH |
1224 | if (rbot < rtop) { |
1225 | if (buf < end) | |
1226 | *buf = '-'; | |
1227 | buf++; | |
1228 | ||
ce0b4910 | 1229 | buf = number(buf, end, rtop, default_dec_spec); |
dbc760bc TH |
1230 | } |
1231 | ||
1232 | rbot = cur; | |
1233 | } | |
1234 | return buf; | |
1235 | } | |
1236 | ||
cf3b429b JP |
1237 | static noinline_for_stack |
1238 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
1239 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 1240 | { |
8a27f7c9 | 1241 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
1242 | char *p = mac_addr; |
1243 | int i; | |
bc7259a2 | 1244 | char separator; |
76597ff9 | 1245 | bool reversed = false; |
bc7259a2 | 1246 | |
3e5903eb PM |
1247 | if (check_pointer(&buf, end, addr, spec)) |
1248 | return buf; | |
1249 | ||
76597ff9 AE |
1250 | switch (fmt[1]) { |
1251 | case 'F': | |
bc7259a2 | 1252 | separator = '-'; |
76597ff9 AE |
1253 | break; |
1254 | ||
1255 | case 'R': | |
1256 | reversed = true; | |
1257 | /* fall through */ | |
1258 | ||
1259 | default: | |
bc7259a2 | 1260 | separator = ':'; |
76597ff9 | 1261 | break; |
bc7259a2 | 1262 | } |
dd45c9cf HH |
1263 | |
1264 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
1265 | if (reversed) |
1266 | p = hex_byte_pack(p, addr[5 - i]); | |
1267 | else | |
1268 | p = hex_byte_pack(p, addr[i]); | |
1269 | ||
8a27f7c9 | 1270 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 1271 | *p++ = separator; |
dd45c9cf HH |
1272 | } |
1273 | *p = '\0'; | |
1274 | ||
d529ac41 | 1275 | return string_nocheck(buf, end, mac_addr, spec); |
dd45c9cf HH |
1276 | } |
1277 | ||
cf3b429b JP |
1278 | static noinline_for_stack |
1279 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
1280 | { |
1281 | int i; | |
0159f24e JP |
1282 | bool leading_zeros = (fmt[0] == 'i'); |
1283 | int index; | |
1284 | int step; | |
1285 | ||
1286 | switch (fmt[2]) { | |
1287 | case 'h': | |
1288 | #ifdef __BIG_ENDIAN | |
1289 | index = 0; | |
1290 | step = 1; | |
1291 | #else | |
1292 | index = 3; | |
1293 | step = -1; | |
1294 | #endif | |
1295 | break; | |
1296 | case 'l': | |
1297 | index = 3; | |
1298 | step = -1; | |
1299 | break; | |
1300 | case 'n': | |
1301 | case 'b': | |
1302 | default: | |
1303 | index = 0; | |
1304 | step = 1; | |
1305 | break; | |
1306 | } | |
8a27f7c9 | 1307 | for (i = 0; i < 4; i++) { |
7c43d9a3 | 1308 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ |
133fd9f5 | 1309 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
1310 | if (leading_zeros) { |
1311 | if (digits < 3) | |
1312 | *p++ = '0'; | |
1313 | if (digits < 2) | |
1314 | *p++ = '0'; | |
1315 | } | |
1316 | /* reverse the digits in the quad */ | |
1317 | while (digits--) | |
1318 | *p++ = temp[digits]; | |
1319 | if (i < 3) | |
1320 | *p++ = '.'; | |
0159f24e | 1321 | index += step; |
8a27f7c9 | 1322 | } |
8a27f7c9 | 1323 | *p = '\0'; |
7b9186f5 | 1324 | |
8a27f7c9 JP |
1325 | return p; |
1326 | } | |
1327 | ||
cf3b429b JP |
1328 | static noinline_for_stack |
1329 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 1330 | { |
7b9186f5 | 1331 | int i, j, range; |
8a27f7c9 JP |
1332 | unsigned char zerolength[8]; |
1333 | int longest = 1; | |
1334 | int colonpos = -1; | |
1335 | u16 word; | |
7b9186f5 | 1336 | u8 hi, lo; |
8a27f7c9 | 1337 | bool needcolon = false; |
eb78cd26 JP |
1338 | bool useIPv4; |
1339 | struct in6_addr in6; | |
1340 | ||
1341 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
1342 | ||
1343 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
1344 | |
1345 | memset(zerolength, 0, sizeof(zerolength)); | |
1346 | ||
1347 | if (useIPv4) | |
1348 | range = 6; | |
1349 | else | |
1350 | range = 8; | |
1351 | ||
1352 | /* find position of longest 0 run */ | |
1353 | for (i = 0; i < range; i++) { | |
1354 | for (j = i; j < range; j++) { | |
eb78cd26 | 1355 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
1356 | break; |
1357 | zerolength[i]++; | |
1358 | } | |
1359 | } | |
1360 | for (i = 0; i < range; i++) { | |
1361 | if (zerolength[i] > longest) { | |
1362 | longest = zerolength[i]; | |
1363 | colonpos = i; | |
1364 | } | |
1365 | } | |
29cf519e JP |
1366 | if (longest == 1) /* don't compress a single 0 */ |
1367 | colonpos = -1; | |
689afa7d | 1368 | |
8a27f7c9 JP |
1369 | /* emit address */ |
1370 | for (i = 0; i < range; i++) { | |
1371 | if (i == colonpos) { | |
1372 | if (needcolon || i == 0) | |
1373 | *p++ = ':'; | |
1374 | *p++ = ':'; | |
1375 | needcolon = false; | |
1376 | i += longest - 1; | |
1377 | continue; | |
1378 | } | |
1379 | if (needcolon) { | |
1380 | *p++ = ':'; | |
1381 | needcolon = false; | |
1382 | } | |
1383 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1384 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1385 | hi = word >> 8; |
1386 | lo = word & 0xff; | |
1387 | if (hi) { | |
1388 | if (hi > 0x0f) | |
55036ba7 | 1389 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1390 | else |
1391 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1392 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1393 | } |
b5ff992b | 1394 | else if (lo > 0x0f) |
55036ba7 | 1395 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1396 | else |
1397 | *p++ = hex_asc_lo(lo); | |
1398 | needcolon = true; | |
1399 | } | |
1400 | ||
1401 | if (useIPv4) { | |
1402 | if (needcolon) | |
1403 | *p++ = ':'; | |
0159f24e | 1404 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1405 | } |
8a27f7c9 | 1406 | *p = '\0'; |
7b9186f5 | 1407 | |
8a27f7c9 JP |
1408 | return p; |
1409 | } | |
1410 | ||
cf3b429b JP |
1411 | static noinline_for_stack |
1412 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1413 | { |
1414 | int i; | |
7b9186f5 | 1415 | |
689afa7d | 1416 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1417 | p = hex_byte_pack(p, *addr++); |
1418 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1419 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1420 | *p++ = ':'; |
1421 | } | |
1422 | *p = '\0'; | |
7b9186f5 | 1423 | |
8a27f7c9 JP |
1424 | return p; |
1425 | } | |
1426 | ||
cf3b429b JP |
1427 | static noinline_for_stack |
1428 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1429 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1430 | { |
1431 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1432 | ||
1433 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1434 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1435 | else |
eb78cd26 | 1436 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1437 | |
d529ac41 | 1438 | return string_nocheck(buf, end, ip6_addr, spec); |
689afa7d HH |
1439 | } |
1440 | ||
cf3b429b JP |
1441 | static noinline_for_stack |
1442 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1443 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1444 | { |
8a27f7c9 | 1445 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1446 | |
0159f24e | 1447 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1448 | |
d529ac41 | 1449 | return string_nocheck(buf, end, ip4_addr, spec); |
4aa99606 HH |
1450 | } |
1451 | ||
10679643 DB |
1452 | static noinline_for_stack |
1453 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1454 | struct printf_spec spec, const char *fmt) | |
1455 | { | |
1456 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1457 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1458 | sizeof(":12345") + sizeof("/123456789") + | |
1459 | sizeof("%1234567890")]; | |
1460 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1461 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1462 | char fmt6[2] = { fmt[0], '6' }; | |
1463 | u8 off = 0; | |
1464 | ||
1465 | fmt++; | |
1466 | while (isalpha(*++fmt)) { | |
1467 | switch (*fmt) { | |
1468 | case 'p': | |
1469 | have_p = true; | |
1470 | break; | |
1471 | case 'f': | |
1472 | have_f = true; | |
1473 | break; | |
1474 | case 's': | |
1475 | have_s = true; | |
1476 | break; | |
1477 | case 'c': | |
1478 | have_c = true; | |
1479 | break; | |
1480 | } | |
1481 | } | |
1482 | ||
1483 | if (have_p || have_s || have_f) { | |
1484 | *p = '['; | |
1485 | off = 1; | |
1486 | } | |
1487 | ||
1488 | if (fmt6[0] == 'I' && have_c) | |
1489 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1490 | else | |
1491 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1492 | ||
1493 | if (have_p || have_s || have_f) | |
1494 | *p++ = ']'; | |
1495 | ||
1496 | if (have_p) { | |
1497 | *p++ = ':'; | |
1498 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1499 | } | |
1500 | if (have_f) { | |
1501 | *p++ = '/'; | |
1502 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1503 | IPV6_FLOWINFO_MASK), spec); | |
1504 | } | |
1505 | if (have_s) { | |
1506 | *p++ = '%'; | |
1507 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1508 | } | |
1509 | *p = '\0'; | |
1510 | ||
d529ac41 | 1511 | return string_nocheck(buf, end, ip6_addr, spec); |
10679643 DB |
1512 | } |
1513 | ||
1514 | static noinline_for_stack | |
1515 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1516 | struct printf_spec spec, const char *fmt) | |
1517 | { | |
1518 | bool have_p = false; | |
1519 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1520 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1521 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1522 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1523 | ||
1524 | fmt++; | |
1525 | while (isalpha(*++fmt)) { | |
1526 | switch (*fmt) { | |
1527 | case 'p': | |
1528 | have_p = true; | |
1529 | break; | |
1530 | case 'h': | |
1531 | case 'l': | |
1532 | case 'n': | |
1533 | case 'b': | |
1534 | fmt4[2] = *fmt; | |
1535 | break; | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | p = ip4_string(ip4_addr, addr, fmt4); | |
1540 | if (have_p) { | |
1541 | *p++ = ':'; | |
1542 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1543 | } | |
1544 | *p = '\0'; | |
1545 | ||
d529ac41 | 1546 | return string_nocheck(buf, end, ip4_addr, spec); |
10679643 DB |
1547 | } |
1548 | ||
f00cc102 PM |
1549 | static noinline_for_stack |
1550 | char *ip_addr_string(char *buf, char *end, const void *ptr, | |
1551 | struct printf_spec spec, const char *fmt) | |
1552 | { | |
0b74d4d7 PM |
1553 | char *err_fmt_msg; |
1554 | ||
3e5903eb PM |
1555 | if (check_pointer(&buf, end, ptr, spec)) |
1556 | return buf; | |
1557 | ||
f00cc102 PM |
1558 | switch (fmt[1]) { |
1559 | case '6': | |
1560 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1561 | case '4': | |
1562 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1563 | case 'S': { | |
1564 | const union { | |
1565 | struct sockaddr raw; | |
1566 | struct sockaddr_in v4; | |
1567 | struct sockaddr_in6 v6; | |
1568 | } *sa = ptr; | |
1569 | ||
1570 | switch (sa->raw.sa_family) { | |
1571 | case AF_INET: | |
1572 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1573 | case AF_INET6: | |
1574 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1575 | default: | |
c8c3b584 | 1576 | return error_string(buf, end, "(einval)", spec); |
f00cc102 PM |
1577 | }} |
1578 | } | |
1579 | ||
0b74d4d7 | 1580 | err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)"; |
c8c3b584 | 1581 | return error_string(buf, end, err_fmt_msg, spec); |
f00cc102 PM |
1582 | } |
1583 | ||
71dca95d AS |
1584 | static noinline_for_stack |
1585 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1586 | const char *fmt) | |
1587 | { | |
1588 | bool found = true; | |
1589 | int count = 1; | |
1590 | unsigned int flags = 0; | |
1591 | int len; | |
1592 | ||
1593 | if (spec.field_width == 0) | |
1594 | return buf; /* nothing to print */ | |
1595 | ||
3e5903eb PM |
1596 | if (check_pointer(&buf, end, addr, spec)) |
1597 | return buf; | |
71dca95d AS |
1598 | |
1599 | do { | |
1600 | switch (fmt[count++]) { | |
1601 | case 'a': | |
1602 | flags |= ESCAPE_ANY; | |
1603 | break; | |
1604 | case 'c': | |
1605 | flags |= ESCAPE_SPECIAL; | |
1606 | break; | |
1607 | case 'h': | |
1608 | flags |= ESCAPE_HEX; | |
1609 | break; | |
1610 | case 'n': | |
1611 | flags |= ESCAPE_NULL; | |
1612 | break; | |
1613 | case 'o': | |
1614 | flags |= ESCAPE_OCTAL; | |
1615 | break; | |
1616 | case 'p': | |
1617 | flags |= ESCAPE_NP; | |
1618 | break; | |
1619 | case 's': | |
1620 | flags |= ESCAPE_SPACE; | |
1621 | break; | |
1622 | default: | |
1623 | found = false; | |
1624 | break; | |
1625 | } | |
1626 | } while (found); | |
1627 | ||
1628 | if (!flags) | |
1629 | flags = ESCAPE_ANY_NP; | |
1630 | ||
1631 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1632 | ||
41416f23 RV |
1633 | /* |
1634 | * string_escape_mem() writes as many characters as it can to | |
1635 | * the given buffer, and returns the total size of the output | |
1636 | * had the buffer been big enough. | |
1637 | */ | |
1638 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
71dca95d AS |
1639 | |
1640 | return buf; | |
1641 | } | |
1642 | ||
3e5903eb PM |
1643 | static char *va_format(char *buf, char *end, struct va_format *va_fmt, |
1644 | struct printf_spec spec, const char *fmt) | |
45c3e93d PM |
1645 | { |
1646 | va_list va; | |
1647 | ||
3e5903eb PM |
1648 | if (check_pointer(&buf, end, va_fmt, spec)) |
1649 | return buf; | |
1650 | ||
45c3e93d PM |
1651 | va_copy(va, *va_fmt->va); |
1652 | buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va); | |
1653 | va_end(va); | |
1654 | ||
1655 | return buf; | |
1656 | } | |
1657 | ||
cf3b429b JP |
1658 | static noinline_for_stack |
1659 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1660 | struct printf_spec spec, const char *fmt) | |
9ac6e44e | 1661 | { |
2b1b0d66 | 1662 | char uuid[UUID_STRING_LEN + 1]; |
9ac6e44e JP |
1663 | char *p = uuid; |
1664 | int i; | |
f9727a17 | 1665 | const u8 *index = uuid_index; |
9ac6e44e JP |
1666 | bool uc = false; |
1667 | ||
3e5903eb PM |
1668 | if (check_pointer(&buf, end, addr, spec)) |
1669 | return buf; | |
1670 | ||
9ac6e44e JP |
1671 | switch (*(++fmt)) { |
1672 | case 'L': | |
1673 | uc = true; /* fall-through */ | |
1674 | case 'l': | |
f9727a17 | 1675 | index = guid_index; |
9ac6e44e JP |
1676 | break; |
1677 | case 'B': | |
1678 | uc = true; | |
1679 | break; | |
1680 | } | |
1681 | ||
1682 | for (i = 0; i < 16; i++) { | |
aa4ea1c3 AS |
1683 | if (uc) |
1684 | p = hex_byte_pack_upper(p, addr[index[i]]); | |
1685 | else | |
1686 | p = hex_byte_pack(p, addr[index[i]]); | |
9ac6e44e JP |
1687 | switch (i) { |
1688 | case 3: | |
1689 | case 5: | |
1690 | case 7: | |
1691 | case 9: | |
1692 | *p++ = '-'; | |
1693 | break; | |
1694 | } | |
1695 | } | |
1696 | ||
1697 | *p = 0; | |
1698 | ||
d529ac41 | 1699 | return string_nocheck(buf, end, uuid, spec); |
9ac6e44e JP |
1700 | } |
1701 | ||
5b17aecf | 1702 | static noinline_for_stack |
431bca24 GU |
1703 | char *netdev_bits(char *buf, char *end, const void *addr, |
1704 | struct printf_spec spec, const char *fmt) | |
c8f44aff | 1705 | { |
5b17aecf AS |
1706 | unsigned long long num; |
1707 | int size; | |
1708 | ||
3e5903eb PM |
1709 | if (check_pointer(&buf, end, addr, spec)) |
1710 | return buf; | |
1711 | ||
5b17aecf AS |
1712 | switch (fmt[1]) { |
1713 | case 'F': | |
1714 | num = *(const netdev_features_t *)addr; | |
1715 | size = sizeof(netdev_features_t); | |
1716 | break; | |
1717 | default: | |
c8c3b584 | 1718 | return error_string(buf, end, "(%pN?)", spec); |
5b17aecf | 1719 | } |
c8f44aff | 1720 | |
3cab1e71 | 1721 | return special_hex_number(buf, end, num, size); |
c8f44aff MM |
1722 | } |
1723 | ||
aaf07621 | 1724 | static noinline_for_stack |
3e5903eb PM |
1725 | char *address_val(char *buf, char *end, const void *addr, |
1726 | struct printf_spec spec, const char *fmt) | |
aaf07621 JP |
1727 | { |
1728 | unsigned long long num; | |
3cab1e71 | 1729 | int size; |
aaf07621 | 1730 | |
3e5903eb PM |
1731 | if (check_pointer(&buf, end, addr, spec)) |
1732 | return buf; | |
1733 | ||
aaf07621 JP |
1734 | switch (fmt[1]) { |
1735 | case 'd': | |
1736 | num = *(const dma_addr_t *)addr; | |
3cab1e71 | 1737 | size = sizeof(dma_addr_t); |
aaf07621 JP |
1738 | break; |
1739 | case 'p': | |
1740 | default: | |
1741 | num = *(const phys_addr_t *)addr; | |
3cab1e71 | 1742 | size = sizeof(phys_addr_t); |
aaf07621 JP |
1743 | break; |
1744 | } | |
1745 | ||
3cab1e71 | 1746 | return special_hex_number(buf, end, num, size); |
aaf07621 JP |
1747 | } |
1748 | ||
4d42c447 AS |
1749 | static noinline_for_stack |
1750 | char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r) | |
1751 | { | |
1752 | int year = tm->tm_year + (r ? 0 : 1900); | |
1753 | int mon = tm->tm_mon + (r ? 0 : 1); | |
1754 | ||
1755 | buf = number(buf, end, year, default_dec04_spec); | |
1756 | if (buf < end) | |
1757 | *buf = '-'; | |
1758 | buf++; | |
1759 | ||
1760 | buf = number(buf, end, mon, default_dec02_spec); | |
1761 | if (buf < end) | |
1762 | *buf = '-'; | |
1763 | buf++; | |
1764 | ||
1765 | return number(buf, end, tm->tm_mday, default_dec02_spec); | |
1766 | } | |
1767 | ||
1768 | static noinline_for_stack | |
1769 | char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r) | |
1770 | { | |
1771 | buf = number(buf, end, tm->tm_hour, default_dec02_spec); | |
1772 | if (buf < end) | |
1773 | *buf = ':'; | |
1774 | buf++; | |
1775 | ||
1776 | buf = number(buf, end, tm->tm_min, default_dec02_spec); | |
1777 | if (buf < end) | |
1778 | *buf = ':'; | |
1779 | buf++; | |
1780 | ||
1781 | return number(buf, end, tm->tm_sec, default_dec02_spec); | |
1782 | } | |
1783 | ||
1784 | static noinline_for_stack | |
3e5903eb PM |
1785 | char *rtc_str(char *buf, char *end, const struct rtc_time *tm, |
1786 | struct printf_spec spec, const char *fmt) | |
4d42c447 AS |
1787 | { |
1788 | bool have_t = true, have_d = true; | |
1789 | bool raw = false; | |
1790 | int count = 2; | |
1791 | ||
3e5903eb PM |
1792 | if (check_pointer(&buf, end, tm, spec)) |
1793 | return buf; | |
1794 | ||
4d42c447 AS |
1795 | switch (fmt[count]) { |
1796 | case 'd': | |
1797 | have_t = false; | |
1798 | count++; | |
1799 | break; | |
1800 | case 't': | |
1801 | have_d = false; | |
1802 | count++; | |
1803 | break; | |
1804 | } | |
1805 | ||
1806 | raw = fmt[count] == 'r'; | |
1807 | ||
1808 | if (have_d) | |
1809 | buf = date_str(buf, end, tm, raw); | |
1810 | if (have_d && have_t) { | |
1811 | /* Respect ISO 8601 */ | |
1812 | if (buf < end) | |
1813 | *buf = 'T'; | |
1814 | buf++; | |
1815 | } | |
1816 | if (have_t) | |
1817 | buf = time_str(buf, end, tm, raw); | |
1818 | ||
1819 | return buf; | |
1820 | } | |
1821 | ||
1822 | static noinline_for_stack | |
1823 | char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec, | |
1824 | const char *fmt) | |
1825 | { | |
1826 | switch (fmt[1]) { | |
1827 | case 'R': | |
3e5903eb | 1828 | return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt); |
4d42c447 | 1829 | default: |
c8c3b584 | 1830 | return error_string(buf, end, "(%ptR?)", spec); |
4d42c447 AS |
1831 | } |
1832 | } | |
1833 | ||
900cca29 GU |
1834 | static noinline_for_stack |
1835 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1836 | const char *fmt) | |
1837 | { | |
0b74d4d7 | 1838 | if (!IS_ENABLED(CONFIG_HAVE_CLK)) |
c8c3b584 | 1839 | return error_string(buf, end, "(%pC?)", spec); |
0b74d4d7 | 1840 | |
3e5903eb PM |
1841 | if (check_pointer(&buf, end, clk, spec)) |
1842 | return buf; | |
900cca29 GU |
1843 | |
1844 | switch (fmt[1]) { | |
900cca29 GU |
1845 | case 'n': |
1846 | default: | |
1847 | #ifdef CONFIG_COMMON_CLK | |
1848 | return string(buf, end, __clk_get_name(clk), spec); | |
1849 | #else | |
4ca96aa9 | 1850 | return ptr_to_id(buf, end, clk, spec); |
900cca29 GU |
1851 | #endif |
1852 | } | |
1853 | } | |
1854 | ||
edf14cdb VB |
1855 | static |
1856 | char *format_flags(char *buf, char *end, unsigned long flags, | |
1857 | const struct trace_print_flags *names) | |
1858 | { | |
1859 | unsigned long mask; | |
edf14cdb VB |
1860 | |
1861 | for ( ; flags && names->name; names++) { | |
1862 | mask = names->mask; | |
1863 | if ((flags & mask) != mask) | |
1864 | continue; | |
1865 | ||
abd4fe62 | 1866 | buf = string(buf, end, names->name, default_str_spec); |
edf14cdb VB |
1867 | |
1868 | flags &= ~mask; | |
1869 | if (flags) { | |
1870 | if (buf < end) | |
1871 | *buf = '|'; | |
1872 | buf++; | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | if (flags) | |
54433973 | 1877 | buf = number(buf, end, flags, default_flag_spec); |
edf14cdb VB |
1878 | |
1879 | return buf; | |
1880 | } | |
1881 | ||
1882 | static noinline_for_stack | |
0b74d4d7 PM |
1883 | char *flags_string(char *buf, char *end, void *flags_ptr, |
1884 | struct printf_spec spec, const char *fmt) | |
edf14cdb VB |
1885 | { |
1886 | unsigned long flags; | |
1887 | const struct trace_print_flags *names; | |
1888 | ||
3e5903eb PM |
1889 | if (check_pointer(&buf, end, flags_ptr, spec)) |
1890 | return buf; | |
1891 | ||
edf14cdb VB |
1892 | switch (fmt[1]) { |
1893 | case 'p': | |
1894 | flags = *(unsigned long *)flags_ptr; | |
1895 | /* Remove zone id */ | |
1896 | flags &= (1UL << NR_PAGEFLAGS) - 1; | |
1897 | names = pageflag_names; | |
1898 | break; | |
1899 | case 'v': | |
1900 | flags = *(unsigned long *)flags_ptr; | |
1901 | names = vmaflag_names; | |
1902 | break; | |
1903 | case 'g': | |
1904 | flags = *(gfp_t *)flags_ptr; | |
1905 | names = gfpflag_names; | |
1906 | break; | |
1907 | default: | |
c8c3b584 | 1908 | return error_string(buf, end, "(%pG?)", spec); |
edf14cdb VB |
1909 | } |
1910 | ||
1911 | return format_flags(buf, end, flags, names); | |
1912 | } | |
1913 | ||
ce4fecf1 | 1914 | static noinline_for_stack |
a92eb762 SA |
1915 | char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf, |
1916 | char *end) | |
ce4fecf1 PA |
1917 | { |
1918 | int depth; | |
ce4fecf1 | 1919 | |
a92eb762 SA |
1920 | /* Loop starting from the root node to the current node. */ |
1921 | for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) { | |
1922 | struct fwnode_handle *__fwnode = | |
1923 | fwnode_get_nth_parent(fwnode, depth); | |
ce4fecf1 | 1924 | |
a92eb762 | 1925 | buf = string(buf, end, fwnode_get_name_prefix(__fwnode), |
abd4fe62 | 1926 | default_str_spec); |
a92eb762 | 1927 | buf = string(buf, end, fwnode_get_name(__fwnode), |
abd4fe62 | 1928 | default_str_spec); |
a92eb762 SA |
1929 | |
1930 | fwnode_handle_put(__fwnode); | |
ce4fecf1 | 1931 | } |
a92eb762 | 1932 | |
ce4fecf1 PA |
1933 | return buf; |
1934 | } | |
1935 | ||
1936 | static noinline_for_stack | |
1937 | char *device_node_string(char *buf, char *end, struct device_node *dn, | |
1938 | struct printf_spec spec, const char *fmt) | |
1939 | { | |
1940 | char tbuf[sizeof("xxxx") + 1]; | |
1941 | const char *p; | |
1942 | int ret; | |
1943 | char *buf_start = buf; | |
1944 | struct property *prop; | |
1945 | bool has_mult, pass; | |
1946 | static const struct printf_spec num_spec = { | |
1947 | .flags = SMALL, | |
1948 | .field_width = -1, | |
1949 | .precision = -1, | |
1950 | .base = 10, | |
1951 | }; | |
1952 | ||
1953 | struct printf_spec str_spec = spec; | |
1954 | str_spec.field_width = -1; | |
1955 | ||
83abc5a7 SA |
1956 | if (fmt[0] != 'F') |
1957 | return error_string(buf, end, "(%pO?)", spec); | |
1958 | ||
ce4fecf1 | 1959 | if (!IS_ENABLED(CONFIG_OF)) |
c8c3b584 | 1960 | return error_string(buf, end, "(%pOF?)", spec); |
ce4fecf1 | 1961 | |
3e5903eb PM |
1962 | if (check_pointer(&buf, end, dn, spec)) |
1963 | return buf; | |
ce4fecf1 PA |
1964 | |
1965 | /* simple case without anything any more format specifiers */ | |
1966 | fmt++; | |
1967 | if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0) | |
1968 | fmt = "f"; | |
1969 | ||
1970 | for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) { | |
6d0a70a2 | 1971 | int precision; |
ce4fecf1 PA |
1972 | if (pass) { |
1973 | if (buf < end) | |
1974 | *buf = ':'; | |
1975 | buf++; | |
1976 | } | |
1977 | ||
1978 | switch (*fmt) { | |
1979 | case 'f': /* full_name */ | |
a92eb762 SA |
1980 | buf = fwnode_full_name_string(of_fwnode_handle(dn), buf, |
1981 | end); | |
ce4fecf1 PA |
1982 | break; |
1983 | case 'n': /* name */ | |
a92eb762 | 1984 | p = fwnode_get_name(of_fwnode_handle(dn)); |
6d0a70a2 RH |
1985 | precision = str_spec.precision; |
1986 | str_spec.precision = strchrnul(p, '@') - p; | |
1987 | buf = string(buf, end, p, str_spec); | |
1988 | str_spec.precision = precision; | |
ce4fecf1 PA |
1989 | break; |
1990 | case 'p': /* phandle */ | |
1991 | buf = number(buf, end, (unsigned int)dn->phandle, num_spec); | |
1992 | break; | |
1993 | case 'P': /* path-spec */ | |
a92eb762 | 1994 | p = fwnode_get_name(of_fwnode_handle(dn)); |
ce4fecf1 PA |
1995 | if (!p[1]) |
1996 | p = "/"; | |
1997 | buf = string(buf, end, p, str_spec); | |
1998 | break; | |
1999 | case 'F': /* flags */ | |
2000 | tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-'; | |
2001 | tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-'; | |
2002 | tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-'; | |
2003 | tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-'; | |
2004 | tbuf[4] = 0; | |
d529ac41 | 2005 | buf = string_nocheck(buf, end, tbuf, str_spec); |
ce4fecf1 PA |
2006 | break; |
2007 | case 'c': /* major compatible string */ | |
2008 | ret = of_property_read_string(dn, "compatible", &p); | |
2009 | if (!ret) | |
2010 | buf = string(buf, end, p, str_spec); | |
2011 | break; | |
2012 | case 'C': /* full compatible string */ | |
2013 | has_mult = false; | |
2014 | of_property_for_each_string(dn, "compatible", prop, p) { | |
2015 | if (has_mult) | |
d529ac41 PM |
2016 | buf = string_nocheck(buf, end, ",", str_spec); |
2017 | buf = string_nocheck(buf, end, "\"", str_spec); | |
ce4fecf1 | 2018 | buf = string(buf, end, p, str_spec); |
d529ac41 | 2019 | buf = string_nocheck(buf, end, "\"", str_spec); |
ce4fecf1 PA |
2020 | |
2021 | has_mult = true; | |
2022 | } | |
2023 | break; | |
2024 | default: | |
2025 | break; | |
2026 | } | |
2027 | } | |
2028 | ||
2029 | return widen_string(buf, buf - buf_start, end, spec); | |
2030 | } | |
2031 | ||
3bd32d6a SA |
2032 | static noinline_for_stack |
2033 | char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode, | |
2034 | struct printf_spec spec, const char *fmt) | |
798cc27a | 2035 | { |
3bd32d6a SA |
2036 | struct printf_spec str_spec = spec; |
2037 | char *buf_start = buf; | |
2038 | ||
2039 | str_spec.field_width = -1; | |
2040 | ||
2041 | if (*fmt != 'w') | |
2042 | return error_string(buf, end, "(%pf?)", spec); | |
2043 | ||
2044 | if (check_pointer(&buf, end, fwnode, spec)) | |
2045 | return buf; | |
2046 | ||
2047 | fmt++; | |
2048 | ||
2049 | switch (*fmt) { | |
2050 | case 'P': /* name */ | |
2051 | buf = string(buf, end, fwnode_get_name(fwnode), str_spec); | |
2052 | break; | |
2053 | case 'f': /* full_name */ | |
2054 | default: | |
2055 | buf = fwnode_full_name_string(fwnode, buf, end); | |
2056 | break; | |
798cc27a PM |
2057 | } |
2058 | ||
3bd32d6a | 2059 | return widen_string(buf, buf - buf_start, end, spec); |
798cc27a PM |
2060 | } |
2061 | ||
4d8a743c LT |
2062 | /* |
2063 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
2064 | * by an extra set of alphanumeric characters that are extended format | |
2065 | * specifiers. | |
2066 | * | |
0b523769 JP |
2067 | * Please update scripts/checkpatch.pl when adding/removing conversion |
2068 | * characters. (Search for "check for vsprintf extension"). | |
2069 | * | |
332d2e78 LT |
2070 | * Right now we handle: |
2071 | * | |
cdb7e52d SS |
2072 | * - 'S' For symbolic direct pointers (or function descriptors) with offset |
2073 | * - 's' For symbolic direct pointers (or function descriptors) without offset | |
9af77064 | 2074 | * - '[Ss]R' as above with __builtin_extract_return_addr() translation |
1586c5ae SA |
2075 | * - '[Ff]' %pf and %pF were obsoleted and later removed in favor of |
2076 | * %ps and %pS. Be careful when re-using these specifiers. | |
0f77a8d3 | 2077 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
2078 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
2079 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
2080 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
2081 | * width which must be explicitly specified either as part of the | |
2082 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
2083 | * range-list format instead of hex format | |
dd45c9cf HH |
2084 | * - 'M' For a 6-byte MAC address, it prints the address in the |
2085 | * usual colon-separated hex notation | |
8a27f7c9 | 2086 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 2087 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 2088 | * with a dash-separated hex notation |
7c59154e | 2089 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
2090 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
2091 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
2092 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
2093 | * [S][pfs] |
2094 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
2095 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
2096 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
2097 | * IPv6 omits the colons (01020304...0f) | |
2098 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
2099 | * [S][pfs] |
2100 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
2101 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
2102 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
2103 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 2104 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
2105 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
2106 | * of the following flags (see string_escape_mem() for the | |
2107 | * details): | |
2108 | * a - ESCAPE_ANY | |
2109 | * c - ESCAPE_SPECIAL | |
2110 | * h - ESCAPE_HEX | |
2111 | * n - ESCAPE_NULL | |
2112 | * o - ESCAPE_OCTAL | |
2113 | * p - ESCAPE_NP | |
2114 | * s - ESCAPE_SPACE | |
2115 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
2116 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
2117 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
2118 | * Options for %pU are: | |
2119 | * b big endian lower case hex (default) | |
2120 | * B big endian UPPER case hex | |
2121 | * l little endian lower case hex | |
2122 | * L little endian UPPER case hex | |
2123 | * big endian output byte order is: | |
2124 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
2125 | * little endian output byte order is: | |
2126 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
2127 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
2128 | * call vsnprintf(->format, *->va_list). | |
2129 | * Implements a "recursive vsnprintf". | |
2130 | * Do not use this feature without some mechanism to verify the | |
2131 | * correctness of the format string and va_list arguments. | |
455cd5ab | 2132 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 2133 | * - 'NF' For a netdev_features_t |
31550a16 AS |
2134 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
2135 | * a certain separator (' ' by default): | |
2136 | * C colon | |
2137 | * D dash | |
2138 | * N no separator | |
2139 | * The maximum supported length is 64 bytes of the input. Consider | |
2140 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
2141 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
2142 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
2143 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
2144 | * - 'D[234]' Same as 'd' but for a struct file | |
1031bc58 | 2145 | * - 'g' For block_device name (gendisk + partition number) |
4d42c447 AS |
2146 | * - 't[R][dt][r]' For time and date as represented: |
2147 | * R struct rtc_time | |
900cca29 GU |
2148 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
2149 | * (legacy clock framework) of the clock | |
2150 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
2151 | * (legacy clock framework) of the clock | |
edf14cdb VB |
2152 | * - 'G' For flags to be printed as a collection of symbolic strings that would |
2153 | * construct the specific value. Supported flags given by option: | |
2154 | * p page flags (see struct page) given as pointer to unsigned long | |
2155 | * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t | |
2156 | * v vma flags (VM_*) given as pointer to unsigned long | |
94ac8f20 GU |
2157 | * - 'OF[fnpPcCF]' For a device tree object |
2158 | * Without any optional arguments prints the full_name | |
2159 | * f device node full_name | |
2160 | * n device node name | |
2161 | * p device node phandle | |
2162 | * P device node path spec (name + @unit) | |
2163 | * F device node flags | |
2164 | * c major compatible string | |
2165 | * C full compatible string | |
3bd32d6a SA |
2166 | * - 'fw[fP]' For a firmware node (struct fwnode_handle) pointer |
2167 | * Without an option prints the full name of the node | |
2168 | * f full name | |
2169 | * P node name, including a possible unit address | |
7b1924a1 | 2170 | * - 'x' For printing the address. Equivalent to "%lx". |
b2a5212f DB |
2171 | * - '[ku]s' For a BPF/tracing related format specifier, e.g. used out of |
2172 | * bpf_trace_printk() where [ku] prefix specifies either kernel (k) | |
2173 | * or user (u) memory to probe, and: | |
2174 | * s a string, equivalent to "%s" on direct vsnprintf() use | |
7b1924a1 | 2175 | * |
b3ed2321 TH |
2176 | * ** When making changes please also update: |
2177 | * Documentation/core-api/printk-formats.rst | |
9ac6e44e | 2178 | * |
ad67b74d TH |
2179 | * Note: The default behaviour (unadorned %p) is to hash the address, |
2180 | * rendering it useful as a unique identifier. | |
4d8a743c | 2181 | */ |
cf3b429b JP |
2182 | static noinline_for_stack |
2183 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
2184 | struct printf_spec spec) | |
78a8bf69 | 2185 | { |
0fe1ef24 | 2186 | switch (*fmt) { |
0fe1ef24 | 2187 | case 'S': |
9ac6e44e | 2188 | case 's': |
04b8eb7a SS |
2189 | ptr = dereference_symbol_descriptor(ptr); |
2190 | /* Fallthrough */ | |
0f77a8d3 | 2191 | case 'B': |
b0d33c2b | 2192 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 2193 | case 'R': |
c7dabef8 | 2194 | case 'r': |
fd95541e | 2195 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
2196 | case 'h': |
2197 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
2198 | case 'b': |
2199 | switch (fmt[1]) { | |
2200 | case 'l': | |
2201 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
2202 | default: | |
2203 | return bitmap_string(buf, end, ptr, spec, fmt); | |
2204 | } | |
8a27f7c9 JP |
2205 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
2206 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
2207 | /* [mM]F (FDDI) */ |
2208 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
2209 | return mac_address_string(buf, end, ptr, spec, fmt); |
2210 | case 'I': /* Formatted IP supported | |
2211 | * 4: 1.2.3.4 | |
2212 | * 6: 0001:0203:...:0708 | |
2213 | * 6c: 1::708 or 1::1.2.3.4 | |
2214 | */ | |
2215 | case 'i': /* Contiguous: | |
2216 | * 4: 001.002.003.004 | |
2217 | * 6: 000102...0f | |
2218 | */ | |
f00cc102 | 2219 | return ip_addr_string(buf, end, ptr, spec, fmt); |
71dca95d AS |
2220 | case 'E': |
2221 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
2222 | case 'U': |
2223 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 2224 | case 'V': |
3e5903eb | 2225 | return va_format(buf, end, ptr, spec, fmt); |
455cd5ab | 2226 | case 'K': |
57e73442 | 2227 | return restricted_pointer(buf, end, ptr, spec); |
c8f44aff | 2228 | case 'N': |
431bca24 | 2229 | return netdev_bits(buf, end, ptr, spec, fmt); |
7d799210 | 2230 | case 'a': |
3e5903eb | 2231 | return address_val(buf, end, ptr, spec, fmt); |
4b6ccca7 AV |
2232 | case 'd': |
2233 | return dentry_name(buf, end, ptr, spec, fmt); | |
4d42c447 AS |
2234 | case 't': |
2235 | return time_and_date(buf, end, ptr, spec, fmt); | |
900cca29 GU |
2236 | case 'C': |
2237 | return clock(buf, end, ptr, spec, fmt); | |
4b6ccca7 | 2238 | case 'D': |
36594b31 | 2239 | return file_dentry_name(buf, end, ptr, spec, fmt); |
1031bc58 DM |
2240 | #ifdef CONFIG_BLOCK |
2241 | case 'g': | |
2242 | return bdev_name(buf, end, ptr, spec, fmt); | |
2243 | #endif | |
2244 | ||
edf14cdb | 2245 | case 'G': |
0b74d4d7 | 2246 | return flags_string(buf, end, ptr, spec, fmt); |
ce4fecf1 | 2247 | case 'O': |
83abc5a7 | 2248 | return device_node_string(buf, end, ptr, spec, fmt + 1); |
3bd32d6a SA |
2249 | case 'f': |
2250 | return fwnode_string(buf, end, ptr, spec, fmt + 1); | |
7b1924a1 TH |
2251 | case 'x': |
2252 | return pointer_string(buf, end, ptr, spec); | |
57f5677e RV |
2253 | case 'e': |
2254 | /* %pe with a non-ERR_PTR gets treated as plain %p */ | |
2255 | if (!IS_ERR(ptr)) | |
2256 | break; | |
2257 | return err_ptr(buf, end, ptr, spec); | |
b2a5212f DB |
2258 | case 'u': |
2259 | case 'k': | |
2260 | switch (fmt[1]) { | |
2261 | case 's': | |
2262 | return string(buf, end, ptr, spec); | |
2263 | default: | |
2264 | return error_string(buf, end, "(einval)", spec); | |
2265 | } | |
fef20d9c | 2266 | } |
fef20d9c | 2267 | |
ad67b74d TH |
2268 | /* default is to _not_ leak addresses, hash before printing */ |
2269 | return ptr_to_id(buf, end, ptr, spec); | |
fef20d9c FW |
2270 | } |
2271 | ||
2272 | /* | |
2273 | * Helper function to decode printf style format. | |
2274 | * Each call decode a token from the format and return the | |
2275 | * number of characters read (or likely the delta where it wants | |
2276 | * to go on the next call). | |
2277 | * The decoded token is returned through the parameters | |
2278 | * | |
2279 | * 'h', 'l', or 'L' for integer fields | |
2280 | * 'z' support added 23/7/1999 S.H. | |
2281 | * 'z' changed to 'Z' --davidm 1/25/99 | |
5b5e0928 | 2282 | * 'Z' changed to 'z' --adobriyan 2017-01-25 |
fef20d9c FW |
2283 | * 't' added for ptrdiff_t |
2284 | * | |
2285 | * @fmt: the format string | |
2286 | * @type of the token returned | |
2287 | * @flags: various flags such as +, -, # tokens.. | |
2288 | * @field_width: overwritten width | |
2289 | * @base: base of the number (octal, hex, ...) | |
2290 | * @precision: precision of a number | |
2291 | * @qualifier: qualifier of a number (long, size_t, ...) | |
2292 | */ | |
cf3b429b JP |
2293 | static noinline_for_stack |
2294 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
2295 | { |
2296 | const char *start = fmt; | |
d0484193 | 2297 | char qualifier; |
fef20d9c FW |
2298 | |
2299 | /* we finished early by reading the field width */ | |
ed681a91 | 2300 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
2301 | if (spec->field_width < 0) { |
2302 | spec->field_width = -spec->field_width; | |
2303 | spec->flags |= LEFT; | |
2304 | } | |
2305 | spec->type = FORMAT_TYPE_NONE; | |
2306 | goto precision; | |
2307 | } | |
2308 | ||
2309 | /* we finished early by reading the precision */ | |
2310 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
2311 | if (spec->precision < 0) | |
2312 | spec->precision = 0; | |
2313 | ||
2314 | spec->type = FORMAT_TYPE_NONE; | |
2315 | goto qualifier; | |
2316 | } | |
2317 | ||
2318 | /* By default */ | |
2319 | spec->type = FORMAT_TYPE_NONE; | |
2320 | ||
2321 | for (; *fmt ; ++fmt) { | |
2322 | if (*fmt == '%') | |
2323 | break; | |
2324 | } | |
2325 | ||
2326 | /* Return the current non-format string */ | |
2327 | if (fmt != start || !*fmt) | |
2328 | return fmt - start; | |
2329 | ||
2330 | /* Process flags */ | |
2331 | spec->flags = 0; | |
2332 | ||
2333 | while (1) { /* this also skips first '%' */ | |
2334 | bool found = true; | |
2335 | ||
2336 | ++fmt; | |
2337 | ||
2338 | switch (*fmt) { | |
2339 | case '-': spec->flags |= LEFT; break; | |
2340 | case '+': spec->flags |= PLUS; break; | |
2341 | case ' ': spec->flags |= SPACE; break; | |
2342 | case '#': spec->flags |= SPECIAL; break; | |
2343 | case '0': spec->flags |= ZEROPAD; break; | |
2344 | default: found = false; | |
2345 | } | |
2346 | ||
2347 | if (!found) | |
2348 | break; | |
2349 | } | |
2350 | ||
2351 | /* get field width */ | |
2352 | spec->field_width = -1; | |
2353 | ||
2354 | if (isdigit(*fmt)) | |
2355 | spec->field_width = skip_atoi(&fmt); | |
2356 | else if (*fmt == '*') { | |
2357 | /* it's the next argument */ | |
ed681a91 | 2358 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
2359 | return ++fmt - start; |
2360 | } | |
2361 | ||
2362 | precision: | |
2363 | /* get the precision */ | |
2364 | spec->precision = -1; | |
2365 | if (*fmt == '.') { | |
2366 | ++fmt; | |
2367 | if (isdigit(*fmt)) { | |
2368 | spec->precision = skip_atoi(&fmt); | |
2369 | if (spec->precision < 0) | |
2370 | spec->precision = 0; | |
2371 | } else if (*fmt == '*') { | |
2372 | /* it's the next argument */ | |
adf26f84 | 2373 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
2374 | return ++fmt - start; |
2375 | } | |
2376 | } | |
2377 | ||
2378 | qualifier: | |
2379 | /* get the conversion qualifier */ | |
d0484193 | 2380 | qualifier = 0; |
75fb8f26 | 2381 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
5b5e0928 | 2382 | *fmt == 'z' || *fmt == 't') { |
d0484193 RV |
2383 | qualifier = *fmt++; |
2384 | if (unlikely(qualifier == *fmt)) { | |
2385 | if (qualifier == 'l') { | |
2386 | qualifier = 'L'; | |
a4e94ef0 | 2387 | ++fmt; |
d0484193 RV |
2388 | } else if (qualifier == 'h') { |
2389 | qualifier = 'H'; | |
a4e94ef0 Z |
2390 | ++fmt; |
2391 | } | |
fef20d9c FW |
2392 | } |
2393 | } | |
2394 | ||
2395 | /* default base */ | |
2396 | spec->base = 10; | |
2397 | switch (*fmt) { | |
2398 | case 'c': | |
2399 | spec->type = FORMAT_TYPE_CHAR; | |
2400 | return ++fmt - start; | |
2401 | ||
2402 | case 's': | |
2403 | spec->type = FORMAT_TYPE_STR; | |
2404 | return ++fmt - start; | |
2405 | ||
2406 | case 'p': | |
2407 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 2408 | return ++fmt - start; |
fef20d9c | 2409 | |
fef20d9c FW |
2410 | case '%': |
2411 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
2412 | return ++fmt - start; | |
2413 | ||
2414 | /* integer number formats - set up the flags and "break" */ | |
2415 | case 'o': | |
2416 | spec->base = 8; | |
2417 | break; | |
2418 | ||
2419 | case 'x': | |
2420 | spec->flags |= SMALL; | |
7e6bd6f3 | 2421 | /* fall through */ |
fef20d9c FW |
2422 | |
2423 | case 'X': | |
2424 | spec->base = 16; | |
2425 | break; | |
2426 | ||
2427 | case 'd': | |
2428 | case 'i': | |
39e874f8 | 2429 | spec->flags |= SIGN; |
fef20d9c | 2430 | case 'u': |
4aa99606 | 2431 | break; |
fef20d9c | 2432 | |
708d96fd RM |
2433 | case 'n': |
2434 | /* | |
b006f19b RV |
2435 | * Since %n poses a greater security risk than |
2436 | * utility, treat it as any other invalid or | |
2437 | * unsupported format specifier. | |
708d96fd | 2438 | */ |
708d96fd RM |
2439 | /* Fall-through */ |
2440 | ||
fef20d9c | 2441 | default: |
b006f19b | 2442 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); |
fef20d9c FW |
2443 | spec->type = FORMAT_TYPE_INVALID; |
2444 | return fmt - start; | |
0fe1ef24 | 2445 | } |
fef20d9c | 2446 | |
d0484193 | 2447 | if (qualifier == 'L') |
fef20d9c | 2448 | spec->type = FORMAT_TYPE_LONG_LONG; |
d0484193 | 2449 | else if (qualifier == 'l') { |
51be17df RV |
2450 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
2451 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
5b5e0928 | 2452 | } else if (qualifier == 'z') { |
fef20d9c | 2453 | spec->type = FORMAT_TYPE_SIZE_T; |
d0484193 | 2454 | } else if (qualifier == 't') { |
fef20d9c | 2455 | spec->type = FORMAT_TYPE_PTRDIFF; |
d0484193 | 2456 | } else if (qualifier == 'H') { |
51be17df RV |
2457 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
2458 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
d0484193 | 2459 | } else if (qualifier == 'h') { |
51be17df RV |
2460 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
2461 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 2462 | } else { |
51be17df RV |
2463 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
2464 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 2465 | } |
fef20d9c FW |
2466 | |
2467 | return ++fmt - start; | |
78a8bf69 LT |
2468 | } |
2469 | ||
4d72ba01 RV |
2470 | static void |
2471 | set_field_width(struct printf_spec *spec, int width) | |
2472 | { | |
2473 | spec->field_width = width; | |
2474 | if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) { | |
2475 | spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX); | |
2476 | } | |
2477 | } | |
2478 | ||
2479 | static void | |
2480 | set_precision(struct printf_spec *spec, int prec) | |
2481 | { | |
2482 | spec->precision = prec; | |
2483 | if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) { | |
2484 | spec->precision = clamp(prec, 0, PRECISION_MAX); | |
2485 | } | |
2486 | } | |
2487 | ||
1da177e4 LT |
2488 | /** |
2489 | * vsnprintf - Format a string and place it in a buffer | |
2490 | * @buf: The buffer to place the result into | |
2491 | * @size: The size of the buffer, including the trailing null space | |
2492 | * @fmt: The format string to use | |
2493 | * @args: Arguments for the format string | |
2494 | * | |
d7ec9a05 RV |
2495 | * This function generally follows C99 vsnprintf, but has some |
2496 | * extensions and a few limitations: | |
2497 | * | |
6cc89134 | 2498 | * - ``%n`` is unsupported |
2499 | * - ``%p*`` is handled by pointer() | |
5e4ee7b1 | 2500 | * |
27e7c0e8 | 2501 | * See pointer() or Documentation/core-api/printk-formats.rst for more |
5e4ee7b1 | 2502 | * extensive description. |
20036fdc | 2503 | * |
6cc89134 | 2504 | * **Please update the documentation in both places when making changes** |
80f548e0 | 2505 | * |
1da177e4 LT |
2506 | * The return value is the number of characters which would |
2507 | * be generated for the given input, excluding the trailing | |
2508 | * '\0', as per ISO C99. If you want to have the exact | |
2509 | * number of characters written into @buf as return value | |
72fd4a35 | 2510 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
2511 | * return is greater than or equal to @size, the resulting |
2512 | * string is truncated. | |
2513 | * | |
ba1835eb | 2514 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
2515 | */ |
2516 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2517 | { | |
1da177e4 | 2518 | unsigned long long num; |
d4be151b | 2519 | char *str, *end; |
fef20d9c | 2520 | struct printf_spec spec = {0}; |
1da177e4 | 2521 | |
f796937a JF |
2522 | /* Reject out-of-range values early. Large positive sizes are |
2523 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 2524 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 2525 | return 0; |
1da177e4 LT |
2526 | |
2527 | str = buf; | |
f796937a | 2528 | end = buf + size; |
1da177e4 | 2529 | |
f796937a JF |
2530 | /* Make sure end is always >= buf */ |
2531 | if (end < buf) { | |
2532 | end = ((void *)-1); | |
2533 | size = end - buf; | |
1da177e4 LT |
2534 | } |
2535 | ||
fef20d9c FW |
2536 | while (*fmt) { |
2537 | const char *old_fmt = fmt; | |
d4be151b | 2538 | int read = format_decode(fmt, &spec); |
1da177e4 | 2539 | |
fef20d9c | 2540 | fmt += read; |
1da177e4 | 2541 | |
fef20d9c FW |
2542 | switch (spec.type) { |
2543 | case FORMAT_TYPE_NONE: { | |
2544 | int copy = read; | |
2545 | if (str < end) { | |
2546 | if (copy > end - str) | |
2547 | copy = end - str; | |
2548 | memcpy(str, old_fmt, copy); | |
1da177e4 | 2549 | } |
fef20d9c FW |
2550 | str += read; |
2551 | break; | |
1da177e4 LT |
2552 | } |
2553 | ||
ed681a91 | 2554 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2555 | set_field_width(&spec, va_arg(args, int)); |
fef20d9c | 2556 | break; |
1da177e4 | 2557 | |
fef20d9c | 2558 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2559 | set_precision(&spec, va_arg(args, int)); |
fef20d9c | 2560 | break; |
1da177e4 | 2561 | |
d4be151b AGR |
2562 | case FORMAT_TYPE_CHAR: { |
2563 | char c; | |
2564 | ||
fef20d9c FW |
2565 | if (!(spec.flags & LEFT)) { |
2566 | while (--spec.field_width > 0) { | |
f796937a | 2567 | if (str < end) |
1da177e4 LT |
2568 | *str = ' '; |
2569 | ++str; | |
1da177e4 | 2570 | |
fef20d9c FW |
2571 | } |
2572 | } | |
2573 | c = (unsigned char) va_arg(args, int); | |
2574 | if (str < end) | |
2575 | *str = c; | |
2576 | ++str; | |
2577 | while (--spec.field_width > 0) { | |
f796937a | 2578 | if (str < end) |
fef20d9c | 2579 | *str = ' '; |
1da177e4 | 2580 | ++str; |
fef20d9c FW |
2581 | } |
2582 | break; | |
d4be151b | 2583 | } |
1da177e4 | 2584 | |
fef20d9c FW |
2585 | case FORMAT_TYPE_STR: |
2586 | str = string(str, end, va_arg(args, char *), spec); | |
2587 | break; | |
1da177e4 | 2588 | |
fef20d9c | 2589 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2590 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
2591 | spec); |
2592 | while (isalnum(*fmt)) | |
2593 | fmt++; | |
2594 | break; | |
1da177e4 | 2595 | |
fef20d9c FW |
2596 | case FORMAT_TYPE_PERCENT_CHAR: |
2597 | if (str < end) | |
2598 | *str = '%'; | |
2599 | ++str; | |
2600 | break; | |
1da177e4 | 2601 | |
fef20d9c | 2602 | case FORMAT_TYPE_INVALID: |
b006f19b RV |
2603 | /* |
2604 | * Presumably the arguments passed gcc's type | |
2605 | * checking, but there is no safe or sane way | |
2606 | * for us to continue parsing the format and | |
2607 | * fetching from the va_list; the remaining | |
2608 | * specifiers and arguments would be out of | |
2609 | * sync. | |
2610 | */ | |
2611 | goto out; | |
fef20d9c | 2612 | |
fef20d9c FW |
2613 | default: |
2614 | switch (spec.type) { | |
2615 | case FORMAT_TYPE_LONG_LONG: | |
2616 | num = va_arg(args, long long); | |
2617 | break; | |
2618 | case FORMAT_TYPE_ULONG: | |
2619 | num = va_arg(args, unsigned long); | |
2620 | break; | |
2621 | case FORMAT_TYPE_LONG: | |
2622 | num = va_arg(args, long); | |
2623 | break; | |
2624 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
2625 | if (spec.flags & SIGN) |
2626 | num = va_arg(args, ssize_t); | |
2627 | else | |
2628 | num = va_arg(args, size_t); | |
fef20d9c FW |
2629 | break; |
2630 | case FORMAT_TYPE_PTRDIFF: | |
2631 | num = va_arg(args, ptrdiff_t); | |
2632 | break; | |
a4e94ef0 Z |
2633 | case FORMAT_TYPE_UBYTE: |
2634 | num = (unsigned char) va_arg(args, int); | |
2635 | break; | |
2636 | case FORMAT_TYPE_BYTE: | |
2637 | num = (signed char) va_arg(args, int); | |
2638 | break; | |
fef20d9c FW |
2639 | case FORMAT_TYPE_USHORT: |
2640 | num = (unsigned short) va_arg(args, int); | |
2641 | break; | |
2642 | case FORMAT_TYPE_SHORT: | |
2643 | num = (short) va_arg(args, int); | |
2644 | break; | |
39e874f8 FW |
2645 | case FORMAT_TYPE_INT: |
2646 | num = (int) va_arg(args, int); | |
fef20d9c FW |
2647 | break; |
2648 | default: | |
2649 | num = va_arg(args, unsigned int); | |
2650 | } | |
2651 | ||
2652 | str = number(str, end, num, spec); | |
1da177e4 | 2653 | } |
1da177e4 | 2654 | } |
fef20d9c | 2655 | |
b006f19b | 2656 | out: |
f796937a JF |
2657 | if (size > 0) { |
2658 | if (str < end) | |
2659 | *str = '\0'; | |
2660 | else | |
0a6047ee | 2661 | end[-1] = '\0'; |
f796937a | 2662 | } |
fef20d9c | 2663 | |
f796937a | 2664 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 2665 | return str-buf; |
fef20d9c | 2666 | |
1da177e4 | 2667 | } |
1da177e4 LT |
2668 | EXPORT_SYMBOL(vsnprintf); |
2669 | ||
2670 | /** | |
2671 | * vscnprintf - Format a string and place it in a buffer | |
2672 | * @buf: The buffer to place the result into | |
2673 | * @size: The size of the buffer, including the trailing null space | |
2674 | * @fmt: The format string to use | |
2675 | * @args: Arguments for the format string | |
2676 | * | |
2677 | * The return value is the number of characters which have been written into | |
b921c69f | 2678 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
2679 | * returns 0. |
2680 | * | |
ba1835eb | 2681 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
2682 | * |
2683 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2684 | */ |
2685 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2686 | { | |
2687 | int i; | |
2688 | ||
7b9186f5 AGR |
2689 | i = vsnprintf(buf, size, fmt, args); |
2690 | ||
b921c69f AA |
2691 | if (likely(i < size)) |
2692 | return i; | |
2693 | if (size != 0) | |
2694 | return size - 1; | |
2695 | return 0; | |
1da177e4 | 2696 | } |
1da177e4 LT |
2697 | EXPORT_SYMBOL(vscnprintf); |
2698 | ||
2699 | /** | |
2700 | * snprintf - Format a string and place it in a buffer | |
2701 | * @buf: The buffer to place the result into | |
2702 | * @size: The size of the buffer, including the trailing null space | |
2703 | * @fmt: The format string to use | |
2704 | * @...: Arguments for the format string | |
2705 | * | |
2706 | * The return value is the number of characters which would be | |
2707 | * generated for the given input, excluding the trailing null, | |
2708 | * as per ISO C99. If the return is greater than or equal to | |
2709 | * @size, the resulting string is truncated. | |
20036fdc AK |
2710 | * |
2711 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2712 | */ |
7b9186f5 | 2713 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2714 | { |
2715 | va_list args; | |
2716 | int i; | |
2717 | ||
2718 | va_start(args, fmt); | |
7b9186f5 | 2719 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2720 | va_end(args); |
7b9186f5 | 2721 | |
1da177e4 LT |
2722 | return i; |
2723 | } | |
1da177e4 LT |
2724 | EXPORT_SYMBOL(snprintf); |
2725 | ||
2726 | /** | |
2727 | * scnprintf - Format a string and place it in a buffer | |
2728 | * @buf: The buffer to place the result into | |
2729 | * @size: The size of the buffer, including the trailing null space | |
2730 | * @fmt: The format string to use | |
2731 | * @...: Arguments for the format string | |
2732 | * | |
2733 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2734 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2735 | */ |
2736 | ||
7b9186f5 | 2737 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2738 | { |
2739 | va_list args; | |
2740 | int i; | |
2741 | ||
2742 | va_start(args, fmt); | |
b921c69f | 2743 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2744 | va_end(args); |
7b9186f5 | 2745 | |
b921c69f | 2746 | return i; |
1da177e4 LT |
2747 | } |
2748 | EXPORT_SYMBOL(scnprintf); | |
2749 | ||
2750 | /** | |
2751 | * vsprintf - Format a string and place it in a buffer | |
2752 | * @buf: The buffer to place the result into | |
2753 | * @fmt: The format string to use | |
2754 | * @args: Arguments for the format string | |
2755 | * | |
2756 | * The function returns the number of characters written | |
72fd4a35 | 2757 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2758 | * buffer overflows. |
2759 | * | |
ba1835eb | 2760 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2761 | * |
2762 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2763 | */ |
2764 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2765 | { | |
2766 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2767 | } | |
1da177e4 LT |
2768 | EXPORT_SYMBOL(vsprintf); |
2769 | ||
2770 | /** | |
2771 | * sprintf - Format a string and place it in a buffer | |
2772 | * @buf: The buffer to place the result into | |
2773 | * @fmt: The format string to use | |
2774 | * @...: Arguments for the format string | |
2775 | * | |
2776 | * The function returns the number of characters written | |
72fd4a35 | 2777 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2778 | * buffer overflows. |
20036fdc AK |
2779 | * |
2780 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2781 | */ |
7b9186f5 | 2782 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2783 | { |
2784 | va_list args; | |
2785 | int i; | |
2786 | ||
2787 | va_start(args, fmt); | |
7b9186f5 | 2788 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2789 | va_end(args); |
7b9186f5 | 2790 | |
1da177e4 LT |
2791 | return i; |
2792 | } | |
1da177e4 LT |
2793 | EXPORT_SYMBOL(sprintf); |
2794 | ||
4370aa4a LJ |
2795 | #ifdef CONFIG_BINARY_PRINTF |
2796 | /* | |
2797 | * bprintf service: | |
2798 | * vbin_printf() - VA arguments to binary data | |
2799 | * bstr_printf() - Binary data to text string | |
2800 | */ | |
2801 | ||
2802 | /** | |
2803 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2804 | * @bin_buf: The buffer to place args' binary value | |
2805 | * @size: The size of the buffer(by words(32bits), not characters) | |
2806 | * @fmt: The format string to use | |
2807 | * @args: Arguments for the format string | |
2808 | * | |
2809 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2810 | * is skipped. |
4370aa4a LJ |
2811 | * |
2812 | * The return value is the number of words(32bits) which would be generated for | |
2813 | * the given input. | |
2814 | * | |
2815 | * NOTE: | |
2816 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2817 | * valid for bstr_printf(). | |
2818 | */ | |
2819 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2820 | { | |
fef20d9c | 2821 | struct printf_spec spec = {0}; |
4370aa4a | 2822 | char *str, *end; |
841a915d | 2823 | int width; |
4370aa4a LJ |
2824 | |
2825 | str = (char *)bin_buf; | |
2826 | end = (char *)(bin_buf + size); | |
2827 | ||
2828 | #define save_arg(type) \ | |
841a915d SRV |
2829 | ({ \ |
2830 | unsigned long long value; \ | |
4370aa4a | 2831 | if (sizeof(type) == 8) { \ |
841a915d | 2832 | unsigned long long val8; \ |
4370aa4a | 2833 | str = PTR_ALIGN(str, sizeof(u32)); \ |
841a915d | 2834 | val8 = va_arg(args, unsigned long long); \ |
4370aa4a | 2835 | if (str + sizeof(type) <= end) { \ |
841a915d SRV |
2836 | *(u32 *)str = *(u32 *)&val8; \ |
2837 | *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \ | |
4370aa4a | 2838 | } \ |
841a915d | 2839 | value = val8; \ |
4370aa4a | 2840 | } else { \ |
841a915d | 2841 | unsigned int val4; \ |
4370aa4a | 2842 | str = PTR_ALIGN(str, sizeof(type)); \ |
841a915d | 2843 | val4 = va_arg(args, int); \ |
4370aa4a | 2844 | if (str + sizeof(type) <= end) \ |
841a915d SRV |
2845 | *(typeof(type) *)str = (type)(long)val4; \ |
2846 | value = (unsigned long long)val4; \ | |
4370aa4a LJ |
2847 | } \ |
2848 | str += sizeof(type); \ | |
841a915d SRV |
2849 | value; \ |
2850 | }) | |
4370aa4a | 2851 | |
fef20d9c | 2852 | while (*fmt) { |
d4be151b | 2853 | int read = format_decode(fmt, &spec); |
4370aa4a | 2854 | |
fef20d9c | 2855 | fmt += read; |
4370aa4a | 2856 | |
fef20d9c FW |
2857 | switch (spec.type) { |
2858 | case FORMAT_TYPE_NONE: | |
d4be151b | 2859 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2860 | break; |
b006f19b RV |
2861 | case FORMAT_TYPE_INVALID: |
2862 | goto out; | |
fef20d9c | 2863 | |
ed681a91 | 2864 | case FORMAT_TYPE_WIDTH: |
fef20d9c | 2865 | case FORMAT_TYPE_PRECISION: |
841a915d SRV |
2866 | width = (int)save_arg(int); |
2867 | /* Pointers may require the width */ | |
2868 | if (*fmt == 'p') | |
2869 | set_field_width(&spec, width); | |
fef20d9c FW |
2870 | break; |
2871 | ||
2872 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2873 | save_arg(char); |
fef20d9c FW |
2874 | break; |
2875 | ||
2876 | case FORMAT_TYPE_STR: { | |
4370aa4a | 2877 | const char *save_str = va_arg(args, char *); |
3e5903eb | 2878 | const char *err_msg; |
4370aa4a | 2879 | size_t len; |
6c356634 | 2880 | |
3e5903eb PM |
2881 | err_msg = check_pointer_msg(save_str); |
2882 | if (err_msg) | |
2883 | save_str = err_msg; | |
2884 | ||
6c356634 AGR |
2885 | len = strlen(save_str) + 1; |
2886 | if (str + len < end) | |
2887 | memcpy(str, save_str, len); | |
2888 | str += len; | |
fef20d9c | 2889 | break; |
4370aa4a | 2890 | } |
fef20d9c FW |
2891 | |
2892 | case FORMAT_TYPE_PTR: | |
841a915d SRV |
2893 | /* Dereferenced pointers must be done now */ |
2894 | switch (*fmt) { | |
2895 | /* Dereference of functions is still OK */ | |
2896 | case 'S': | |
2897 | case 's': | |
1e6338cf SRV |
2898 | case 'x': |
2899 | case 'K': | |
57f5677e | 2900 | case 'e': |
841a915d SRV |
2901 | save_arg(void *); |
2902 | break; | |
2903 | default: | |
2904 | if (!isalnum(*fmt)) { | |
2905 | save_arg(void *); | |
2906 | break; | |
2907 | } | |
2908 | str = pointer(fmt, str, end, va_arg(args, void *), | |
2909 | spec); | |
2910 | if (str + 1 < end) | |
2911 | *str++ = '\0'; | |
2912 | else | |
2913 | end[-1] = '\0'; /* Must be nul terminated */ | |
2914 | } | |
4370aa4a | 2915 | /* skip all alphanumeric pointer suffixes */ |
fef20d9c | 2916 | while (isalnum(*fmt)) |
4370aa4a | 2917 | fmt++; |
fef20d9c FW |
2918 | break; |
2919 | ||
fef20d9c FW |
2920 | default: |
2921 | switch (spec.type) { | |
2922 | ||
2923 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2924 | save_arg(long long); |
fef20d9c FW |
2925 | break; |
2926 | case FORMAT_TYPE_ULONG: | |
2927 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2928 | save_arg(unsigned long); |
fef20d9c FW |
2929 | break; |
2930 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2931 | save_arg(size_t); |
fef20d9c FW |
2932 | break; |
2933 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2934 | save_arg(ptrdiff_t); |
fef20d9c | 2935 | break; |
a4e94ef0 Z |
2936 | case FORMAT_TYPE_UBYTE: |
2937 | case FORMAT_TYPE_BYTE: | |
2938 | save_arg(char); | |
2939 | break; | |
fef20d9c FW |
2940 | case FORMAT_TYPE_USHORT: |
2941 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2942 | save_arg(short); |
fef20d9c FW |
2943 | break; |
2944 | default: | |
4370aa4a | 2945 | save_arg(int); |
fef20d9c | 2946 | } |
4370aa4a LJ |
2947 | } |
2948 | } | |
fef20d9c | 2949 | |
b006f19b | 2950 | out: |
7b9186f5 | 2951 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2952 | #undef save_arg |
4370aa4a LJ |
2953 | } |
2954 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2955 | ||
2956 | /** | |
2957 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2958 | * @buf: The buffer to place the result into | |
2959 | * @size: The size of the buffer, including the trailing null space | |
2960 | * @fmt: The format string to use | |
2961 | * @bin_buf: Binary arguments for the format string | |
2962 | * | |
2963 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2964 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2965 | * a binary buffer that generated by vbin_printf. | |
2966 | * | |
2967 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2968 | * see vsnprintf comment for details. |
4370aa4a LJ |
2969 | * |
2970 | * The return value is the number of characters which would | |
2971 | * be generated for the given input, excluding the trailing | |
2972 | * '\0', as per ISO C99. If you want to have the exact | |
2973 | * number of characters written into @buf as return value | |
2974 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2975 | * return is greater than or equal to @size, the resulting | |
2976 | * string is truncated. | |
2977 | */ | |
2978 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2979 | { | |
fef20d9c | 2980 | struct printf_spec spec = {0}; |
d4be151b AGR |
2981 | char *str, *end; |
2982 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2983 | |
762abb51 | 2984 | if (WARN_ON_ONCE(size > INT_MAX)) |
4370aa4a | 2985 | return 0; |
4370aa4a LJ |
2986 | |
2987 | str = buf; | |
2988 | end = buf + size; | |
2989 | ||
2990 | #define get_arg(type) \ | |
2991 | ({ \ | |
2992 | typeof(type) value; \ | |
2993 | if (sizeof(type) == 8) { \ | |
2994 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2995 | *(u32 *)&value = *(u32 *)args; \ | |
2996 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2997 | } else { \ | |
2998 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2999 | value = *(typeof(type) *)args; \ | |
3000 | } \ | |
3001 | args += sizeof(type); \ | |
3002 | value; \ | |
3003 | }) | |
3004 | ||
3005 | /* Make sure end is always >= buf */ | |
3006 | if (end < buf) { | |
3007 | end = ((void *)-1); | |
3008 | size = end - buf; | |
3009 | } | |
3010 | ||
fef20d9c | 3011 | while (*fmt) { |
fef20d9c | 3012 | const char *old_fmt = fmt; |
d4be151b | 3013 | int read = format_decode(fmt, &spec); |
4370aa4a | 3014 | |
fef20d9c | 3015 | fmt += read; |
4370aa4a | 3016 | |
fef20d9c FW |
3017 | switch (spec.type) { |
3018 | case FORMAT_TYPE_NONE: { | |
3019 | int copy = read; | |
3020 | if (str < end) { | |
3021 | if (copy > end - str) | |
3022 | copy = end - str; | |
3023 | memcpy(str, old_fmt, copy); | |
4370aa4a | 3024 | } |
fef20d9c FW |
3025 | str += read; |
3026 | break; | |
4370aa4a LJ |
3027 | } |
3028 | ||
ed681a91 | 3029 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 3030 | set_field_width(&spec, get_arg(int)); |
fef20d9c | 3031 | break; |
4370aa4a | 3032 | |
fef20d9c | 3033 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 3034 | set_precision(&spec, get_arg(int)); |
fef20d9c | 3035 | break; |
4370aa4a | 3036 | |
d4be151b AGR |
3037 | case FORMAT_TYPE_CHAR: { |
3038 | char c; | |
3039 | ||
fef20d9c FW |
3040 | if (!(spec.flags & LEFT)) { |
3041 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
3042 | if (str < end) |
3043 | *str = ' '; | |
3044 | ++str; | |
3045 | } | |
3046 | } | |
3047 | c = (unsigned char) get_arg(char); | |
3048 | if (str < end) | |
3049 | *str = c; | |
3050 | ++str; | |
fef20d9c | 3051 | while (--spec.field_width > 0) { |
4370aa4a LJ |
3052 | if (str < end) |
3053 | *str = ' '; | |
3054 | ++str; | |
3055 | } | |
fef20d9c | 3056 | break; |
d4be151b | 3057 | } |
4370aa4a | 3058 | |
fef20d9c | 3059 | case FORMAT_TYPE_STR: { |
4370aa4a | 3060 | const char *str_arg = args; |
d4be151b | 3061 | args += strlen(str_arg) + 1; |
fef20d9c FW |
3062 | str = string(str, end, (char *)str_arg, spec); |
3063 | break; | |
4370aa4a LJ |
3064 | } |
3065 | ||
841a915d SRV |
3066 | case FORMAT_TYPE_PTR: { |
3067 | bool process = false; | |
3068 | int copy, len; | |
3069 | /* Non function dereferences were already done */ | |
3070 | switch (*fmt) { | |
3071 | case 'S': | |
3072 | case 's': | |
3073 | case 'F': | |
3074 | case 'f': | |
1e6338cf SRV |
3075 | case 'x': |
3076 | case 'K': | |
57f5677e | 3077 | case 'e': |
841a915d SRV |
3078 | process = true; |
3079 | break; | |
3080 | default: | |
3081 | if (!isalnum(*fmt)) { | |
3082 | process = true; | |
3083 | break; | |
3084 | } | |
3085 | /* Pointer dereference was already processed */ | |
3086 | if (str < end) { | |
3087 | len = copy = strlen(args); | |
3088 | if (copy > end - str) | |
3089 | copy = end - str; | |
3090 | memcpy(str, args, copy); | |
3091 | str += len; | |
62165600 | 3092 | args += len + 1; |
841a915d SRV |
3093 | } |
3094 | } | |
3095 | if (process) | |
3096 | str = pointer(fmt, str, end, get_arg(void *), spec); | |
3097 | ||
fef20d9c | 3098 | while (isalnum(*fmt)) |
4370aa4a | 3099 | fmt++; |
fef20d9c | 3100 | break; |
841a915d | 3101 | } |
4370aa4a | 3102 | |
fef20d9c | 3103 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
3104 | if (str < end) |
3105 | *str = '%'; | |
3106 | ++str; | |
fef20d9c FW |
3107 | break; |
3108 | ||
b006f19b RV |
3109 | case FORMAT_TYPE_INVALID: |
3110 | goto out; | |
3111 | ||
d4be151b AGR |
3112 | default: { |
3113 | unsigned long long num; | |
3114 | ||
fef20d9c FW |
3115 | switch (spec.type) { |
3116 | ||
3117 | case FORMAT_TYPE_LONG_LONG: | |
3118 | num = get_arg(long long); | |
3119 | break; | |
3120 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
3121 | case FORMAT_TYPE_LONG: |
3122 | num = get_arg(unsigned long); | |
3123 | break; | |
3124 | case FORMAT_TYPE_SIZE_T: | |
3125 | num = get_arg(size_t); | |
3126 | break; | |
3127 | case FORMAT_TYPE_PTRDIFF: | |
3128 | num = get_arg(ptrdiff_t); | |
3129 | break; | |
a4e94ef0 Z |
3130 | case FORMAT_TYPE_UBYTE: |
3131 | num = get_arg(unsigned char); | |
3132 | break; | |
3133 | case FORMAT_TYPE_BYTE: | |
3134 | num = get_arg(signed char); | |
3135 | break; | |
fef20d9c FW |
3136 | case FORMAT_TYPE_USHORT: |
3137 | num = get_arg(unsigned short); | |
3138 | break; | |
3139 | case FORMAT_TYPE_SHORT: | |
3140 | num = get_arg(short); | |
3141 | break; | |
3142 | case FORMAT_TYPE_UINT: | |
3143 | num = get_arg(unsigned int); | |
3144 | break; | |
3145 | default: | |
3146 | num = get_arg(int); | |
3147 | } | |
3148 | ||
3149 | str = number(str, end, num, spec); | |
d4be151b AGR |
3150 | } /* default: */ |
3151 | } /* switch(spec.type) */ | |
3152 | } /* while(*fmt) */ | |
fef20d9c | 3153 | |
b006f19b | 3154 | out: |
4370aa4a LJ |
3155 | if (size > 0) { |
3156 | if (str < end) | |
3157 | *str = '\0'; | |
3158 | else | |
3159 | end[-1] = '\0'; | |
3160 | } | |
fef20d9c | 3161 | |
4370aa4a LJ |
3162 | #undef get_arg |
3163 | ||
3164 | /* the trailing null byte doesn't count towards the total */ | |
3165 | return str - buf; | |
3166 | } | |
3167 | EXPORT_SYMBOL_GPL(bstr_printf); | |
3168 | ||
3169 | /** | |
3170 | * bprintf - Parse a format string and place args' binary value in a buffer | |
3171 | * @bin_buf: The buffer to place args' binary value | |
3172 | * @size: The size of the buffer(by words(32bits), not characters) | |
3173 | * @fmt: The format string to use | |
3174 | * @...: Arguments for the format string | |
3175 | * | |
3176 | * The function returns the number of words(u32) written | |
3177 | * into @bin_buf. | |
3178 | */ | |
3179 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
3180 | { | |
3181 | va_list args; | |
3182 | int ret; | |
3183 | ||
3184 | va_start(args, fmt); | |
3185 | ret = vbin_printf(bin_buf, size, fmt, args); | |
3186 | va_end(args); | |
7b9186f5 | 3187 | |
4370aa4a LJ |
3188 | return ret; |
3189 | } | |
3190 | EXPORT_SYMBOL_GPL(bprintf); | |
3191 | ||
3192 | #endif /* CONFIG_BINARY_PRINTF */ | |
3193 | ||
1da177e4 LT |
3194 | /** |
3195 | * vsscanf - Unformat a buffer into a list of arguments | |
3196 | * @buf: input buffer | |
3197 | * @fmt: format of buffer | |
3198 | * @args: arguments | |
3199 | */ | |
7b9186f5 | 3200 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
3201 | { |
3202 | const char *str = buf; | |
3203 | char *next; | |
3204 | char digit; | |
3205 | int num = 0; | |
ef0658f3 | 3206 | u8 qualifier; |
53809751 JB |
3207 | unsigned int base; |
3208 | union { | |
3209 | long long s; | |
3210 | unsigned long long u; | |
3211 | } val; | |
ef0658f3 | 3212 | s16 field_width; |
d4be151b | 3213 | bool is_sign; |
1da177e4 | 3214 | |
da99075c | 3215 | while (*fmt) { |
1da177e4 LT |
3216 | /* skip any white space in format */ |
3217 | /* white space in format matchs any amount of | |
3218 | * white space, including none, in the input. | |
3219 | */ | |
3220 | if (isspace(*fmt)) { | |
e7d2860b AGR |
3221 | fmt = skip_spaces(++fmt); |
3222 | str = skip_spaces(str); | |
1da177e4 LT |
3223 | } |
3224 | ||
3225 | /* anything that is not a conversion must match exactly */ | |
3226 | if (*fmt != '%' && *fmt) { | |
3227 | if (*fmt++ != *str++) | |
3228 | break; | |
3229 | continue; | |
3230 | } | |
3231 | ||
3232 | if (!*fmt) | |
3233 | break; | |
3234 | ++fmt; | |
7b9186f5 | 3235 | |
1da177e4 LT |
3236 | /* skip this conversion. |
3237 | * advance both strings to next white space | |
3238 | */ | |
3239 | if (*fmt == '*') { | |
da99075c JB |
3240 | if (!*str) |
3241 | break; | |
f9310b2f JY |
3242 | while (!isspace(*fmt) && *fmt != '%' && *fmt) { |
3243 | /* '%*[' not yet supported, invalid format */ | |
3244 | if (*fmt == '[') | |
3245 | return num; | |
1da177e4 | 3246 | fmt++; |
f9310b2f | 3247 | } |
1da177e4 LT |
3248 | while (!isspace(*str) && *str) |
3249 | str++; | |
3250 | continue; | |
3251 | } | |
3252 | ||
3253 | /* get field width */ | |
3254 | field_width = -1; | |
53809751 | 3255 | if (isdigit(*fmt)) { |
1da177e4 | 3256 | field_width = skip_atoi(&fmt); |
53809751 JB |
3257 | if (field_width <= 0) |
3258 | break; | |
3259 | } | |
1da177e4 LT |
3260 | |
3261 | /* get conversion qualifier */ | |
3262 | qualifier = -1; | |
75fb8f26 | 3263 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
5b5e0928 | 3264 | *fmt == 'z') { |
1da177e4 LT |
3265 | qualifier = *fmt++; |
3266 | if (unlikely(qualifier == *fmt)) { | |
3267 | if (qualifier == 'h') { | |
3268 | qualifier = 'H'; | |
3269 | fmt++; | |
3270 | } else if (qualifier == 'l') { | |
3271 | qualifier = 'L'; | |
3272 | fmt++; | |
3273 | } | |
3274 | } | |
3275 | } | |
1da177e4 | 3276 | |
da99075c JB |
3277 | if (!*fmt) |
3278 | break; | |
3279 | ||
3280 | if (*fmt == 'n') { | |
3281 | /* return number of characters read so far */ | |
3282 | *va_arg(args, int *) = str - buf; | |
3283 | ++fmt; | |
3284 | continue; | |
3285 | } | |
3286 | ||
3287 | if (!*str) | |
1da177e4 LT |
3288 | break; |
3289 | ||
d4be151b | 3290 | base = 10; |
3f623eba | 3291 | is_sign = false; |
d4be151b | 3292 | |
7b9186f5 | 3293 | switch (*fmt++) { |
1da177e4 LT |
3294 | case 'c': |
3295 | { | |
7b9186f5 | 3296 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
3297 | if (field_width == -1) |
3298 | field_width = 1; | |
3299 | do { | |
3300 | *s++ = *str++; | |
3301 | } while (--field_width > 0 && *str); | |
3302 | num++; | |
3303 | } | |
3304 | continue; | |
3305 | case 's': | |
3306 | { | |
7b9186f5 AGR |
3307 | char *s = (char *)va_arg(args, char *); |
3308 | if (field_width == -1) | |
4be929be | 3309 | field_width = SHRT_MAX; |
1da177e4 | 3310 | /* first, skip leading white space in buffer */ |
e7d2860b | 3311 | str = skip_spaces(str); |
1da177e4 LT |
3312 | |
3313 | /* now copy until next white space */ | |
7b9186f5 | 3314 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 3315 | *s++ = *str++; |
1da177e4 LT |
3316 | *s = '\0'; |
3317 | num++; | |
3318 | } | |
3319 | continue; | |
f9310b2f JY |
3320 | /* |
3321 | * Warning: This implementation of the '[' conversion specifier | |
3322 | * deviates from its glibc counterpart in the following ways: | |
3323 | * (1) It does NOT support ranges i.e. '-' is NOT a special | |
3324 | * character | |
3325 | * (2) It cannot match the closing bracket ']' itself | |
3326 | * (3) A field width is required | |
3327 | * (4) '%*[' (discard matching input) is currently not supported | |
3328 | * | |
3329 | * Example usage: | |
3330 | * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]", | |
3331 | * buf1, buf2, buf3); | |
3332 | * if (ret < 3) | |
3333 | * // etc.. | |
3334 | */ | |
3335 | case '[': | |
3336 | { | |
3337 | char *s = (char *)va_arg(args, char *); | |
3338 | DECLARE_BITMAP(set, 256) = {0}; | |
3339 | unsigned int len = 0; | |
3340 | bool negate = (*fmt == '^'); | |
3341 | ||
3342 | /* field width is required */ | |
3343 | if (field_width == -1) | |
3344 | return num; | |
3345 | ||
3346 | if (negate) | |
3347 | ++fmt; | |
3348 | ||
3349 | for ( ; *fmt && *fmt != ']'; ++fmt, ++len) | |
3350 | set_bit((u8)*fmt, set); | |
3351 | ||
3352 | /* no ']' or no character set found */ | |
3353 | if (!*fmt || !len) | |
3354 | return num; | |
3355 | ++fmt; | |
3356 | ||
3357 | if (negate) { | |
3358 | bitmap_complement(set, set, 256); | |
3359 | /* exclude null '\0' byte */ | |
3360 | clear_bit(0, set); | |
3361 | } | |
3362 | ||
3363 | /* match must be non-empty */ | |
3364 | if (!test_bit((u8)*str, set)) | |
3365 | return num; | |
3366 | ||
3367 | while (test_bit((u8)*str, set) && field_width--) | |
3368 | *s++ = *str++; | |
3369 | *s = '\0'; | |
3370 | ++num; | |
3371 | } | |
3372 | continue; | |
1da177e4 LT |
3373 | case 'o': |
3374 | base = 8; | |
3375 | break; | |
3376 | case 'x': | |
3377 | case 'X': | |
3378 | base = 16; | |
3379 | break; | |
3380 | case 'i': | |
7b9186f5 | 3381 | base = 0; |
7e6bd6f3 | 3382 | /* fall through */ |
1da177e4 | 3383 | case 'd': |
3f623eba | 3384 | is_sign = true; |
7e6bd6f3 | 3385 | /* fall through */ |
1da177e4 LT |
3386 | case 'u': |
3387 | break; | |
3388 | case '%': | |
3389 | /* looking for '%' in str */ | |
7b9186f5 | 3390 | if (*str++ != '%') |
1da177e4 LT |
3391 | return num; |
3392 | continue; | |
3393 | default: | |
3394 | /* invalid format; stop here */ | |
3395 | return num; | |
3396 | } | |
3397 | ||
3398 | /* have some sort of integer conversion. | |
3399 | * first, skip white space in buffer. | |
3400 | */ | |
e7d2860b | 3401 | str = skip_spaces(str); |
1da177e4 LT |
3402 | |
3403 | digit = *str; | |
3404 | if (is_sign && digit == '-') | |
3405 | digit = *(str + 1); | |
3406 | ||
3407 | if (!digit | |
7b9186f5 AGR |
3408 | || (base == 16 && !isxdigit(digit)) |
3409 | || (base == 10 && !isdigit(digit)) | |
3410 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
3411 | || (base == 0 && !isdigit(digit))) | |
3412 | break; | |
1da177e4 | 3413 | |
53809751 JB |
3414 | if (is_sign) |
3415 | val.s = qualifier != 'L' ? | |
3416 | simple_strtol(str, &next, base) : | |
3417 | simple_strtoll(str, &next, base); | |
3418 | else | |
3419 | val.u = qualifier != 'L' ? | |
3420 | simple_strtoul(str, &next, base) : | |
3421 | simple_strtoull(str, &next, base); | |
3422 | ||
3423 | if (field_width > 0 && next - str > field_width) { | |
3424 | if (base == 0) | |
3425 | _parse_integer_fixup_radix(str, &base); | |
3426 | while (next - str > field_width) { | |
3427 | if (is_sign) | |
3428 | val.s = div_s64(val.s, base); | |
3429 | else | |
3430 | val.u = div_u64(val.u, base); | |
3431 | --next; | |
3432 | } | |
3433 | } | |
3434 | ||
7b9186f5 | 3435 | switch (qualifier) { |
1da177e4 | 3436 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
3437 | if (is_sign) |
3438 | *va_arg(args, signed char *) = val.s; | |
3439 | else | |
3440 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
3441 | break; |
3442 | case 'h': | |
53809751 JB |
3443 | if (is_sign) |
3444 | *va_arg(args, short *) = val.s; | |
3445 | else | |
3446 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
3447 | break; |
3448 | case 'l': | |
53809751 JB |
3449 | if (is_sign) |
3450 | *va_arg(args, long *) = val.s; | |
3451 | else | |
3452 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
3453 | break; |
3454 | case 'L': | |
53809751 JB |
3455 | if (is_sign) |
3456 | *va_arg(args, long long *) = val.s; | |
3457 | else | |
3458 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 | 3459 | break; |
1da177e4 | 3460 | case 'z': |
53809751 JB |
3461 | *va_arg(args, size_t *) = val.u; |
3462 | break; | |
1da177e4 | 3463 | default: |
53809751 JB |
3464 | if (is_sign) |
3465 | *va_arg(args, int *) = val.s; | |
3466 | else | |
3467 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
3468 | break; |
3469 | } | |
3470 | num++; | |
3471 | ||
3472 | if (!next) | |
3473 | break; | |
3474 | str = next; | |
3475 | } | |
c6b40d16 | 3476 | |
1da177e4 LT |
3477 | return num; |
3478 | } | |
1da177e4 LT |
3479 | EXPORT_SYMBOL(vsscanf); |
3480 | ||
3481 | /** | |
3482 | * sscanf - Unformat a buffer into a list of arguments | |
3483 | * @buf: input buffer | |
3484 | * @fmt: formatting of buffer | |
3485 | * @...: resulting arguments | |
3486 | */ | |
7b9186f5 | 3487 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
3488 | { |
3489 | va_list args; | |
3490 | int i; | |
3491 | ||
7b9186f5 AGR |
3492 | va_start(args, fmt); |
3493 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 3494 | va_end(args); |
7b9186f5 | 3495 | |
1da177e4 LT |
3496 | return i; |
3497 | } | |
1da177e4 | 3498 | EXPORT_SYMBOL(sscanf); |