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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
7b9186f5 | 12 | /* |
1da177e4 LT |
13 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
14 | * - changed to provide snprintf and vsnprintf functions | |
15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
16 | * - scnprintf and vscnprintf | |
17 | */ | |
18 | ||
19 | #include <stdarg.h> | |
ef27ac18 | 20 | #include <linux/build_bug.h> |
0d1d7a55 | 21 | #include <linux/clk.h> |
900cca29 | 22 | #include <linux/clk-provider.h> |
8bc3bcc9 | 23 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
24 | #include <linux/types.h> |
25 | #include <linux/string.h> | |
26 | #include <linux/ctype.h> | |
27 | #include <linux/kernel.h> | |
0fe1ef24 | 28 | #include <linux/kallsyms.h> |
53809751 | 29 | #include <linux/math64.h> |
0fe1ef24 | 30 | #include <linux/uaccess.h> |
332d2e78 | 31 | #include <linux/ioport.h> |
4b6ccca7 | 32 | #include <linux/dcache.h> |
312b4e22 | 33 | #include <linux/cred.h> |
4d42c447 | 34 | #include <linux/rtc.h> |
2b1b0d66 | 35 | #include <linux/uuid.h> |
ce4fecf1 | 36 | #include <linux/of.h> |
8a27f7c9 | 37 | #include <net/addrconf.h> |
ad67b74d TH |
38 | #include <linux/siphash.h> |
39 | #include <linux/compiler.h> | |
1031bc58 DM |
40 | #ifdef CONFIG_BLOCK |
41 | #include <linux/blkdev.h> | |
42 | #endif | |
1da177e4 | 43 | |
edf14cdb VB |
44 | #include "../mm/internal.h" /* For the trace_print_flags arrays */ |
45 | ||
4e57b681 | 46 | #include <asm/page.h> /* for PAGE_SIZE */ |
7c43d9a3 | 47 | #include <asm/byteorder.h> /* cpu_to_le16 */ |
1da177e4 | 48 | |
71dca95d | 49 | #include <linux/string_helpers.h> |
1dff46d6 | 50 | #include "kstrtox.h" |
aa46a63e | 51 | |
1da177e4 | 52 | /** |
922ac25c | 53 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
54 | * @cp: The start of the string |
55 | * @endp: A pointer to the end of the parsed string will be placed here | |
56 | * @base: The number base to use | |
462e4711 EZ |
57 | * |
58 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 59 | */ |
922ac25c | 60 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 61 | { |
1dff46d6 AD |
62 | unsigned long long result; |
63 | unsigned int rv; | |
aa46a63e | 64 | |
1dff46d6 AD |
65 | cp = _parse_integer_fixup_radix(cp, &base); |
66 | rv = _parse_integer(cp, base, &result); | |
67 | /* FIXME */ | |
68 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 69 | |
1da177e4 LT |
70 | if (endp) |
71 | *endp = (char *)cp; | |
7b9186f5 | 72 | |
1da177e4 LT |
73 | return result; |
74 | } | |
922ac25c | 75 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
76 | |
77 | /** | |
922ac25c | 78 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
79 | * @cp: The start of the string |
80 | * @endp: A pointer to the end of the parsed string will be placed here | |
81 | * @base: The number base to use | |
462e4711 EZ |
82 | * |
83 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 84 | */ |
922ac25c | 85 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 86 | { |
922ac25c | 87 | return simple_strtoull(cp, endp, base); |
1da177e4 | 88 | } |
922ac25c | 89 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
90 | |
91 | /** | |
922ac25c | 92 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
93 | * @cp: The start of the string |
94 | * @endp: A pointer to the end of the parsed string will be placed here | |
95 | * @base: The number base to use | |
462e4711 EZ |
96 | * |
97 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 98 | */ |
922ac25c | 99 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 100 | { |
922ac25c AGR |
101 | if (*cp == '-') |
102 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 103 | |
922ac25c | 104 | return simple_strtoul(cp, endp, base); |
1da177e4 | 105 | } |
922ac25c | 106 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
107 | |
108 | /** | |
109 | * simple_strtoll - convert a string to a signed long long | |
110 | * @cp: The start of the string | |
111 | * @endp: A pointer to the end of the parsed string will be placed here | |
112 | * @base: The number base to use | |
462e4711 EZ |
113 | * |
114 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 115 | */ |
22d27051 | 116 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 117 | { |
7b9186f5 | 118 | if (*cp == '-') |
22d27051 | 119 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 120 | |
22d27051 | 121 | return simple_strtoull(cp, endp, base); |
1da177e4 | 122 | } |
98d5ce0d | 123 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 124 | |
cf3b429b JP |
125 | static noinline_for_stack |
126 | int skip_atoi(const char **s) | |
1da177e4 | 127 | { |
7b9186f5 | 128 | int i = 0; |
1da177e4 | 129 | |
43e5b666 | 130 | do { |
1da177e4 | 131 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 132 | } while (isdigit(**s)); |
7b9186f5 | 133 | |
1da177e4 LT |
134 | return i; |
135 | } | |
136 | ||
7c43d9a3 RV |
137 | /* |
138 | * Decimal conversion is by far the most typical, and is used for | |
139 | * /proc and /sys data. This directly impacts e.g. top performance | |
140 | * with many processes running. We optimize it for speed by emitting | |
141 | * two characters at a time, using a 200 byte lookup table. This | |
142 | * roughly halves the number of multiplications compared to computing | |
143 | * the digits one at a time. Implementation strongly inspired by the | |
144 | * previous version, which in turn used ideas described at | |
145 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
146 | * from the author, Douglas W. Jones). | |
147 | * | |
148 | * It turns out there is precisely one 26 bit fixed-point | |
149 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
150 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
151 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
152 | * irrelevant for our purpose. | |
153 | * | |
154 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
155 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
156 | * | |
157 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
158 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
159 | * for all x <= 43698. | |
133fd9f5 | 160 | */ |
4277eedd | 161 | |
7c43d9a3 RV |
162 | static const u16 decpair[100] = { |
163 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
164 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
165 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
166 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
167 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
168 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
169 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
170 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
171 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
172 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
173 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
174 | #undef _ | |
175 | }; | |
176 | ||
177 | /* | |
178 | * This will print a single '0' even if r == 0, since we would | |
675cf53c RV |
179 | * immediately jump to out_r where two 0s would be written but only |
180 | * one of them accounted for in buf. This is needed by ip4_string | |
181 | * below. All other callers pass a non-zero value of r. | |
7c43d9a3 | 182 | */ |
cf3b429b | 183 | static noinline_for_stack |
7c43d9a3 | 184 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 185 | { |
7c43d9a3 RV |
186 | unsigned q; |
187 | ||
188 | /* 1 <= r < 10^8 */ | |
189 | if (r < 100) | |
190 | goto out_r; | |
191 | ||
192 | /* 100 <= r < 10^8 */ | |
193 | q = (r * (u64)0x28f5c29) >> 32; | |
194 | *((u16 *)buf) = decpair[r - 100*q]; | |
195 | buf += 2; | |
196 | ||
197 | /* 1 <= q < 10^6 */ | |
198 | if (q < 100) | |
199 | goto out_q; | |
200 | ||
201 | /* 100 <= q < 10^6 */ | |
202 | r = (q * (u64)0x28f5c29) >> 32; | |
203 | *((u16 *)buf) = decpair[q - 100*r]; | |
204 | buf += 2; | |
205 | ||
206 | /* 1 <= r < 10^4 */ | |
207 | if (r < 100) | |
208 | goto out_r; | |
209 | ||
210 | /* 100 <= r < 10^4 */ | |
211 | q = (r * 0x147b) >> 19; | |
212 | *((u16 *)buf) = decpair[r - 100*q]; | |
213 | buf += 2; | |
214 | out_q: | |
215 | /* 1 <= q < 100 */ | |
216 | r = q; | |
217 | out_r: | |
218 | /* 1 <= r < 100 */ | |
219 | *((u16 *)buf) = decpair[r]; | |
675cf53c | 220 | buf += r < 10 ? 1 : 2; |
4277eedd DV |
221 | return buf; |
222 | } | |
133fd9f5 | 223 | |
7c43d9a3 | 224 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 |
cf3b429b | 225 | static noinline_for_stack |
7c43d9a3 | 226 | char *put_dec_full8(char *buf, unsigned r) |
4277eedd | 227 | { |
133fd9f5 DV |
228 | unsigned q; |
229 | ||
7c43d9a3 RV |
230 | /* 0 <= r < 10^8 */ |
231 | q = (r * (u64)0x28f5c29) >> 32; | |
232 | *((u16 *)buf) = decpair[r - 100*q]; | |
233 | buf += 2; | |
4277eedd | 234 | |
7c43d9a3 RV |
235 | /* 0 <= q < 10^6 */ |
236 | r = (q * (u64)0x28f5c29) >> 32; | |
237 | *((u16 *)buf) = decpair[q - 100*r]; | |
238 | buf += 2; | |
7b9186f5 | 239 | |
7c43d9a3 RV |
240 | /* 0 <= r < 10^4 */ |
241 | q = (r * 0x147b) >> 19; | |
242 | *((u16 *)buf) = decpair[r - 100*q]; | |
243 | buf += 2; | |
133fd9f5 | 244 | |
7c43d9a3 RV |
245 | /* 0 <= q < 100 */ |
246 | *((u16 *)buf) = decpair[q]; | |
247 | buf += 2; | |
248 | return buf; | |
249 | } | |
133fd9f5 | 250 | |
7c43d9a3 | 251 | static noinline_for_stack |
133fd9f5 DV |
252 | char *put_dec(char *buf, unsigned long long n) |
253 | { | |
7c43d9a3 RV |
254 | if (n >= 100*1000*1000) |
255 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
256 | /* 1 <= n <= 1.6e11 */ | |
257 | if (n >= 100*1000*1000) | |
258 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
259 | /* 1 <= n < 1e8 */ | |
133fd9f5 | 260 | return put_dec_trunc8(buf, n); |
4277eedd | 261 | } |
133fd9f5 | 262 | |
7c43d9a3 | 263 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 |
133fd9f5 | 264 | |
7c43d9a3 RV |
265 | static void |
266 | put_dec_full4(char *buf, unsigned r) | |
4277eedd | 267 | { |
7c43d9a3 RV |
268 | unsigned q; |
269 | ||
270 | /* 0 <= r < 10^4 */ | |
271 | q = (r * 0x147b) >> 19; | |
272 | *((u16 *)buf) = decpair[r - 100*q]; | |
273 | buf += 2; | |
274 | /* 0 <= q < 100 */ | |
275 | *((u16 *)buf) = decpair[q]; | |
2359172a GS |
276 | } |
277 | ||
278 | /* | |
279 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
280 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
281 | * holds for all x < 1,128,869,999. The largest value this | |
282 | * helper will ever be asked to convert is 1,125,520,955. | |
7c43d9a3 | 283 | * (second call in the put_dec code, assuming n is all-ones). |
2359172a | 284 | */ |
7c43d9a3 | 285 | static noinline_for_stack |
2359172a GS |
286 | unsigned put_dec_helper4(char *buf, unsigned x) |
287 | { | |
288 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
289 | ||
290 | put_dec_full4(buf, x - q * 10000); | |
291 | return q; | |
4277eedd DV |
292 | } |
293 | ||
133fd9f5 DV |
294 | /* Based on code by Douglas W. Jones found at |
295 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
296 | * (with permission from the author). | |
297 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
298 | */ | |
299 | static | |
300 | char *put_dec(char *buf, unsigned long long n) | |
301 | { | |
302 | uint32_t d3, d2, d1, q, h; | |
303 | ||
304 | if (n < 100*1000*1000) | |
305 | return put_dec_trunc8(buf, n); | |
306 | ||
307 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
308 | h = (n >> 32); | |
309 | d2 = (h ) & 0xffff; | |
310 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
311 | ||
7c43d9a3 RV |
312 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 |
313 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
133fd9f5 | 314 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
2359172a GS |
315 | q = put_dec_helper4(buf, q); |
316 | ||
317 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
318 | q = put_dec_helper4(buf+4, q); | |
319 | ||
320 | q += 4749 * d3 + 42 * d2; | |
321 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 322 | |
2359172a GS |
323 | q += 281 * d3; |
324 | buf += 12; | |
325 | if (q) | |
326 | buf = put_dec_trunc8(buf, q); | |
327 | else while (buf[-1] == '0') | |
133fd9f5 DV |
328 | --buf; |
329 | ||
330 | return buf; | |
331 | } | |
332 | ||
333 | #endif | |
334 | ||
1ac101a5 KH |
335 | /* |
336 | * Convert passed number to decimal string. | |
337 | * Returns the length of string. On buffer overflow, returns 0. | |
338 | * | |
339 | * If speed is not important, use snprintf(). It's easy to read the code. | |
340 | */ | |
d1be35cb | 341 | int num_to_str(char *buf, int size, unsigned long long num, unsigned int width) |
1ac101a5 | 342 | { |
7c43d9a3 RV |
343 | /* put_dec requires 2-byte alignment of the buffer. */ |
344 | char tmp[sizeof(num) * 3] __aligned(2); | |
1ac101a5 KH |
345 | int idx, len; |
346 | ||
133fd9f5 DV |
347 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
348 | if (num <= 9) { | |
349 | tmp[0] = '0' + num; | |
350 | len = 1; | |
351 | } else { | |
352 | len = put_dec(tmp, num) - tmp; | |
353 | } | |
1ac101a5 | 354 | |
d1be35cb | 355 | if (len > size || width > size) |
1ac101a5 | 356 | return 0; |
d1be35cb AV |
357 | |
358 | if (width > len) { | |
359 | width = width - len; | |
360 | for (idx = 0; idx < width; idx++) | |
361 | buf[idx] = ' '; | |
362 | } else { | |
363 | width = 0; | |
364 | } | |
365 | ||
1ac101a5 | 366 | for (idx = 0; idx < len; ++idx) |
d1be35cb AV |
367 | buf[idx + width] = tmp[len - idx - 1]; |
368 | ||
369 | return len + width; | |
1ac101a5 KH |
370 | } |
371 | ||
51be17df | 372 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 373 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
374 | #define PLUS 4 /* show plus */ |
375 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 376 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
377 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
378 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 379 | |
fef20d9c FW |
380 | enum format_type { |
381 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 382 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
383 | FORMAT_TYPE_PRECISION, |
384 | FORMAT_TYPE_CHAR, | |
385 | FORMAT_TYPE_STR, | |
386 | FORMAT_TYPE_PTR, | |
387 | FORMAT_TYPE_PERCENT_CHAR, | |
388 | FORMAT_TYPE_INVALID, | |
389 | FORMAT_TYPE_LONG_LONG, | |
390 | FORMAT_TYPE_ULONG, | |
391 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
392 | FORMAT_TYPE_UBYTE, |
393 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
394 | FORMAT_TYPE_USHORT, |
395 | FORMAT_TYPE_SHORT, | |
396 | FORMAT_TYPE_UINT, | |
397 | FORMAT_TYPE_INT, | |
fef20d9c FW |
398 | FORMAT_TYPE_SIZE_T, |
399 | FORMAT_TYPE_PTRDIFF | |
400 | }; | |
401 | ||
402 | struct printf_spec { | |
d0484193 RV |
403 | unsigned int type:8; /* format_type enum */ |
404 | signed int field_width:24; /* width of output field */ | |
405 | unsigned int flags:8; /* flags to number() */ | |
406 | unsigned int base:8; /* number base, 8, 10 or 16 only */ | |
407 | signed int precision:16; /* # of digits/chars */ | |
408 | } __packed; | |
ef27ac18 RV |
409 | static_assert(sizeof(struct printf_spec) == 8); |
410 | ||
4d72ba01 RV |
411 | #define FIELD_WIDTH_MAX ((1 << 23) - 1) |
412 | #define PRECISION_MAX ((1 << 15) - 1) | |
fef20d9c | 413 | |
cf3b429b JP |
414 | static noinline_for_stack |
415 | char *number(char *buf, char *end, unsigned long long num, | |
416 | struct printf_spec spec) | |
1da177e4 | 417 | { |
7c43d9a3 RV |
418 | /* put_dec requires 2-byte alignment of the buffer. */ |
419 | char tmp[3 * sizeof(num)] __aligned(2); | |
9b706aee DV |
420 | char sign; |
421 | char locase; | |
fef20d9c | 422 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 423 | int i; |
7c203422 | 424 | bool is_zero = num == 0LL; |
1c7a8e62 RV |
425 | int field_width = spec.field_width; |
426 | int precision = spec.precision; | |
1da177e4 | 427 | |
9b706aee DV |
428 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
429 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
430 | locase = (spec.flags & SMALL); |
431 | if (spec.flags & LEFT) | |
432 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 433 | sign = 0; |
fef20d9c | 434 | if (spec.flags & SIGN) { |
7b9186f5 | 435 | if ((signed long long)num < 0) { |
1da177e4 | 436 | sign = '-'; |
7b9186f5 | 437 | num = -(signed long long)num; |
1c7a8e62 | 438 | field_width--; |
fef20d9c | 439 | } else if (spec.flags & PLUS) { |
1da177e4 | 440 | sign = '+'; |
1c7a8e62 | 441 | field_width--; |
fef20d9c | 442 | } else if (spec.flags & SPACE) { |
1da177e4 | 443 | sign = ' '; |
1c7a8e62 | 444 | field_width--; |
1da177e4 LT |
445 | } |
446 | } | |
b39a7340 | 447 | if (need_pfx) { |
fef20d9c | 448 | if (spec.base == 16) |
1c7a8e62 | 449 | field_width -= 2; |
7c203422 | 450 | else if (!is_zero) |
1c7a8e62 | 451 | field_width--; |
1da177e4 | 452 | } |
b39a7340 DV |
453 | |
454 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 455 | i = 0; |
133fd9f5 | 456 | if (num < spec.base) |
3ea8d440 | 457 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
458 | else if (spec.base != 10) { /* 8 or 16 */ |
459 | int mask = spec.base - 1; | |
b39a7340 | 460 | int shift = 3; |
7b9186f5 AGR |
461 | |
462 | if (spec.base == 16) | |
463 | shift = 4; | |
b39a7340 | 464 | do { |
3ea8d440 | 465 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
466 | num >>= shift; |
467 | } while (num); | |
4277eedd DV |
468 | } else { /* base 10 */ |
469 | i = put_dec(tmp, num) - tmp; | |
470 | } | |
b39a7340 DV |
471 | |
472 | /* printing 100 using %2d gives "100", not "00" */ | |
1c7a8e62 RV |
473 | if (i > precision) |
474 | precision = i; | |
b39a7340 | 475 | /* leading space padding */ |
1c7a8e62 | 476 | field_width -= precision; |
51be17df | 477 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
1c7a8e62 | 478 | while (--field_width >= 0) { |
f796937a | 479 | if (buf < end) |
1da177e4 LT |
480 | *buf = ' '; |
481 | ++buf; | |
482 | } | |
483 | } | |
b39a7340 | 484 | /* sign */ |
1da177e4 | 485 | if (sign) { |
f796937a | 486 | if (buf < end) |
1da177e4 LT |
487 | *buf = sign; |
488 | ++buf; | |
489 | } | |
b39a7340 DV |
490 | /* "0x" / "0" prefix */ |
491 | if (need_pfx) { | |
7c203422 PC |
492 | if (spec.base == 16 || !is_zero) { |
493 | if (buf < end) | |
494 | *buf = '0'; | |
495 | ++buf; | |
496 | } | |
fef20d9c | 497 | if (spec.base == 16) { |
f796937a | 498 | if (buf < end) |
9b706aee | 499 | *buf = ('X' | locase); |
1da177e4 LT |
500 | ++buf; |
501 | } | |
502 | } | |
b39a7340 | 503 | /* zero or space padding */ |
fef20d9c | 504 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
505 | char c = ' ' + (spec.flags & ZEROPAD); |
506 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
1c7a8e62 | 507 | while (--field_width >= 0) { |
f796937a | 508 | if (buf < end) |
1da177e4 LT |
509 | *buf = c; |
510 | ++buf; | |
511 | } | |
512 | } | |
b39a7340 | 513 | /* hmm even more zero padding? */ |
1c7a8e62 | 514 | while (i <= --precision) { |
f796937a | 515 | if (buf < end) |
1da177e4 LT |
516 | *buf = '0'; |
517 | ++buf; | |
518 | } | |
b39a7340 DV |
519 | /* actual digits of result */ |
520 | while (--i >= 0) { | |
f796937a | 521 | if (buf < end) |
1da177e4 LT |
522 | *buf = tmp[i]; |
523 | ++buf; | |
524 | } | |
b39a7340 | 525 | /* trailing space padding */ |
1c7a8e62 | 526 | while (--field_width >= 0) { |
f796937a | 527 | if (buf < end) |
1da177e4 LT |
528 | *buf = ' '; |
529 | ++buf; | |
530 | } | |
7b9186f5 | 531 | |
1da177e4 LT |
532 | return buf; |
533 | } | |
534 | ||
3cab1e71 AS |
535 | static noinline_for_stack |
536 | char *special_hex_number(char *buf, char *end, unsigned long long num, int size) | |
537 | { | |
538 | struct printf_spec spec; | |
539 | ||
540 | spec.type = FORMAT_TYPE_PTR; | |
541 | spec.field_width = 2 + 2 * size; /* 0x + hex */ | |
542 | spec.flags = SPECIAL | SMALL | ZEROPAD; | |
543 | spec.base = 16; | |
544 | spec.precision = -1; | |
545 | ||
546 | return number(buf, end, num, spec); | |
547 | } | |
548 | ||
cfccde04 | 549 | static void move_right(char *buf, char *end, unsigned len, unsigned spaces) |
4b6ccca7 AV |
550 | { |
551 | size_t size; | |
552 | if (buf >= end) /* nowhere to put anything */ | |
553 | return; | |
554 | size = end - buf; | |
555 | if (size <= spaces) { | |
556 | memset(buf, ' ', size); | |
557 | return; | |
558 | } | |
559 | if (len) { | |
560 | if (len > size - spaces) | |
561 | len = size - spaces; | |
562 | memmove(buf + spaces, buf, len); | |
563 | } | |
564 | memset(buf, ' ', spaces); | |
565 | } | |
566 | ||
cfccde04 RV |
567 | /* |
568 | * Handle field width padding for a string. | |
569 | * @buf: current buffer position | |
570 | * @n: length of string | |
571 | * @end: end of output buffer | |
572 | * @spec: for field width and flags | |
573 | * Returns: new buffer position after padding. | |
574 | */ | |
575 | static noinline_for_stack | |
576 | char *widen_string(char *buf, int n, char *end, struct printf_spec spec) | |
577 | { | |
578 | unsigned spaces; | |
579 | ||
580 | if (likely(n >= spec.field_width)) | |
581 | return buf; | |
582 | /* we want to pad the sucker */ | |
583 | spaces = spec.field_width - n; | |
584 | if (!(spec.flags & LEFT)) { | |
585 | move_right(buf - n, end, n, spaces); | |
586 | return buf + spaces; | |
587 | } | |
588 | while (spaces--) { | |
589 | if (buf < end) | |
590 | *buf = ' '; | |
591 | ++buf; | |
592 | } | |
593 | return buf; | |
594 | } | |
595 | ||
95508cfa RV |
596 | static noinline_for_stack |
597 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
598 | { | |
34fc8b90 RV |
599 | int len = 0; |
600 | size_t lim = spec.precision; | |
95508cfa RV |
601 | |
602 | if ((unsigned long)s < PAGE_SIZE) | |
603 | s = "(null)"; | |
604 | ||
34fc8b90 RV |
605 | while (lim--) { |
606 | char c = *s++; | |
607 | if (!c) | |
608 | break; | |
95508cfa | 609 | if (buf < end) |
34fc8b90 | 610 | *buf = c; |
95508cfa | 611 | ++buf; |
34fc8b90 | 612 | ++len; |
95508cfa | 613 | } |
34fc8b90 | 614 | return widen_string(buf, len, end, spec); |
95508cfa RV |
615 | } |
616 | ||
9073dac1 GU |
617 | static noinline_for_stack |
618 | char *pointer_string(char *buf, char *end, const void *ptr, | |
619 | struct printf_spec spec) | |
620 | { | |
621 | spec.base = 16; | |
622 | spec.flags |= SMALL; | |
623 | if (spec.field_width == -1) { | |
624 | spec.field_width = 2 * sizeof(ptr); | |
625 | spec.flags |= ZEROPAD; | |
626 | } | |
627 | ||
628 | return number(buf, end, (unsigned long int)ptr, spec); | |
629 | } | |
630 | ||
631 | /* Make pointers available for printing early in the boot sequence. */ | |
632 | static int debug_boot_weak_hash __ro_after_init; | |
633 | ||
634 | static int __init debug_boot_weak_hash_enable(char *str) | |
635 | { | |
636 | debug_boot_weak_hash = 1; | |
637 | pr_info("debug_boot_weak_hash enabled\n"); | |
638 | return 0; | |
639 | } | |
640 | early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable); | |
641 | ||
642 | static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key); | |
643 | static siphash_key_t ptr_key __read_mostly; | |
644 | ||
645 | static void enable_ptr_key_workfn(struct work_struct *work) | |
646 | { | |
647 | get_random_bytes(&ptr_key, sizeof(ptr_key)); | |
648 | /* Needs to run from preemptible context */ | |
649 | static_branch_disable(¬_filled_random_ptr_key); | |
650 | } | |
651 | ||
652 | static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn); | |
653 | ||
654 | static void fill_random_ptr_key(struct random_ready_callback *unused) | |
655 | { | |
656 | /* This may be in an interrupt handler. */ | |
657 | queue_work(system_unbound_wq, &enable_ptr_key_work); | |
658 | } | |
659 | ||
660 | static struct random_ready_callback random_ready = { | |
661 | .func = fill_random_ptr_key | |
662 | }; | |
663 | ||
664 | static int __init initialize_ptr_random(void) | |
665 | { | |
666 | int key_size = sizeof(ptr_key); | |
667 | int ret; | |
668 | ||
669 | /* Use hw RNG if available. */ | |
670 | if (get_random_bytes_arch(&ptr_key, key_size) == key_size) { | |
671 | static_branch_disable(¬_filled_random_ptr_key); | |
672 | return 0; | |
673 | } | |
674 | ||
675 | ret = add_random_ready_callback(&random_ready); | |
676 | if (!ret) { | |
677 | return 0; | |
678 | } else if (ret == -EALREADY) { | |
679 | /* This is in preemptible context */ | |
680 | enable_ptr_key_workfn(&enable_ptr_key_work); | |
681 | return 0; | |
682 | } | |
683 | ||
684 | return ret; | |
685 | } | |
686 | early_initcall(initialize_ptr_random); | |
687 | ||
688 | /* Maps a pointer to a 32 bit unique identifier. */ | |
689 | static char *ptr_to_id(char *buf, char *end, const void *ptr, | |
690 | struct printf_spec spec) | |
691 | { | |
692 | const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)"; | |
693 | unsigned long hashval; | |
694 | ||
695 | /* When debugging early boot use non-cryptographically secure hash. */ | |
696 | if (unlikely(debug_boot_weak_hash)) { | |
697 | hashval = hash_long((unsigned long)ptr, 32); | |
698 | return pointer_string(buf, end, (const void *)hashval, spec); | |
699 | } | |
700 | ||
701 | if (static_branch_unlikely(¬_filled_random_ptr_key)) { | |
702 | spec.field_width = 2 * sizeof(ptr); | |
703 | /* string length must be less than default_width */ | |
704 | return string(buf, end, str, spec); | |
705 | } | |
706 | ||
707 | #ifdef CONFIG_64BIT | |
708 | hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key); | |
709 | /* | |
710 | * Mask off the first 32 bits, this makes explicit that we have | |
711 | * modified the address (and 32 bits is plenty for a unique ID). | |
712 | */ | |
713 | hashval = hashval & 0xffffffff; | |
714 | #else | |
715 | hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key); | |
716 | #endif | |
717 | return pointer_string(buf, end, (const void *)hashval, spec); | |
718 | } | |
719 | ||
4b6ccca7 AV |
720 | static noinline_for_stack |
721 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
722 | const char *fmt) | |
723 | { | |
724 | const char *array[4], *s; | |
725 | const struct dentry *p; | |
726 | int depth; | |
727 | int i, n; | |
728 | ||
729 | switch (fmt[1]) { | |
730 | case '2': case '3': case '4': | |
731 | depth = fmt[1] - '0'; | |
732 | break; | |
733 | default: | |
734 | depth = 1; | |
735 | } | |
736 | ||
737 | rcu_read_lock(); | |
738 | for (i = 0; i < depth; i++, d = p) { | |
6aa7de05 MR |
739 | p = READ_ONCE(d->d_parent); |
740 | array[i] = READ_ONCE(d->d_name.name); | |
4b6ccca7 AV |
741 | if (p == d) { |
742 | if (i) | |
743 | array[i] = ""; | |
744 | i++; | |
745 | break; | |
746 | } | |
747 | } | |
748 | s = array[--i]; | |
749 | for (n = 0; n != spec.precision; n++, buf++) { | |
750 | char c = *s++; | |
751 | if (!c) { | |
752 | if (!i) | |
753 | break; | |
754 | c = '/'; | |
755 | s = array[--i]; | |
756 | } | |
757 | if (buf < end) | |
758 | *buf = c; | |
759 | } | |
760 | rcu_read_unlock(); | |
cfccde04 | 761 | return widen_string(buf, n, end, spec); |
4b6ccca7 AV |
762 | } |
763 | ||
1031bc58 DM |
764 | #ifdef CONFIG_BLOCK |
765 | static noinline_for_stack | |
766 | char *bdev_name(char *buf, char *end, struct block_device *bdev, | |
767 | struct printf_spec spec, const char *fmt) | |
768 | { | |
769 | struct gendisk *hd = bdev->bd_disk; | |
770 | ||
771 | buf = string(buf, end, hd->disk_name, spec); | |
772 | if (bdev->bd_part->partno) { | |
773 | if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { | |
774 | if (buf < end) | |
775 | *buf = 'p'; | |
776 | buf++; | |
777 | } | |
778 | buf = number(buf, end, bdev->bd_part->partno, spec); | |
779 | } | |
780 | return buf; | |
781 | } | |
782 | #endif | |
783 | ||
cf3b429b JP |
784 | static noinline_for_stack |
785 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 786 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 787 | { |
b0d33c2b | 788 | unsigned long value; |
0fe1ef24 LT |
789 | #ifdef CONFIG_KALLSYMS |
790 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
791 | #endif |
792 | ||
793 | if (fmt[1] == 'R') | |
794 | ptr = __builtin_extract_return_addr(ptr); | |
795 | value = (unsigned long)ptr; | |
796 | ||
797 | #ifdef CONFIG_KALLSYMS | |
798 | if (*fmt == 'B') | |
0f77a8d3 | 799 | sprint_backtrace(sym, value); |
b0d33c2b | 800 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
801 | sprint_symbol(sym, value); |
802 | else | |
4796dd20 | 803 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 804 | |
fef20d9c | 805 | return string(buf, end, sym, spec); |
0fe1ef24 | 806 | #else |
3cab1e71 | 807 | return special_hex_number(buf, end, value, sizeof(void *)); |
0fe1ef24 LT |
808 | #endif |
809 | } | |
810 | ||
abd4fe62 AS |
811 | static const struct printf_spec default_str_spec = { |
812 | .field_width = -1, | |
813 | .precision = -1, | |
814 | }; | |
815 | ||
54433973 AS |
816 | static const struct printf_spec default_flag_spec = { |
817 | .base = 16, | |
818 | .precision = -1, | |
819 | .flags = SPECIAL | SMALL, | |
820 | }; | |
821 | ||
ce0b4910 AS |
822 | static const struct printf_spec default_dec_spec = { |
823 | .base = 10, | |
824 | .precision = -1, | |
825 | }; | |
826 | ||
4d42c447 AS |
827 | static const struct printf_spec default_dec02_spec = { |
828 | .base = 10, | |
829 | .field_width = 2, | |
830 | .precision = -1, | |
831 | .flags = ZEROPAD, | |
832 | }; | |
833 | ||
834 | static const struct printf_spec default_dec04_spec = { | |
835 | .base = 10, | |
836 | .field_width = 4, | |
837 | .precision = -1, | |
838 | .flags = ZEROPAD, | |
839 | }; | |
840 | ||
cf3b429b JP |
841 | static noinline_for_stack |
842 | char *resource_string(char *buf, char *end, struct resource *res, | |
843 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
844 | { |
845 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 846 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
847 | #endif |
848 | ||
849 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 850 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 851 | #endif |
4da0b66c | 852 | static const struct printf_spec io_spec = { |
fef20d9c | 853 | .base = 16, |
4da0b66c | 854 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
855 | .precision = -1, |
856 | .flags = SPECIAL | SMALL | ZEROPAD, | |
857 | }; | |
4da0b66c BH |
858 | static const struct printf_spec mem_spec = { |
859 | .base = 16, | |
860 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
861 | .precision = -1, | |
862 | .flags = SPECIAL | SMALL | ZEROPAD, | |
863 | }; | |
0f4050c7 BH |
864 | static const struct printf_spec bus_spec = { |
865 | .base = 16, | |
866 | .field_width = 2, | |
867 | .precision = -1, | |
868 | .flags = SMALL | ZEROPAD, | |
869 | }; | |
4da0b66c | 870 | static const struct printf_spec str_spec = { |
fd95541e BH |
871 | .field_width = -1, |
872 | .precision = 10, | |
873 | .flags = LEFT, | |
874 | }; | |
c7dabef8 BH |
875 | |
876 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
877 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
878 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
879 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 880 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
881 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
882 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
883 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
884 | ||
332d2e78 | 885 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 886 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 887 | const struct printf_spec *specp; |
332d2e78 LT |
888 | |
889 | *p++ = '['; | |
4da0b66c | 890 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 891 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
892 | specp = &io_spec; |
893 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 894 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
895 | specp = &mem_spec; |
896 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 897 | p = string(p, pend, "irq ", str_spec); |
ce0b4910 | 898 | specp = &default_dec_spec; |
4da0b66c | 899 | } else if (res->flags & IORESOURCE_DMA) { |
c7dabef8 | 900 | p = string(p, pend, "dma ", str_spec); |
ce0b4910 | 901 | specp = &default_dec_spec; |
0f4050c7 BH |
902 | } else if (res->flags & IORESOURCE_BUS) { |
903 | p = string(p, pend, "bus ", str_spec); | |
904 | specp = &bus_spec; | |
4da0b66c | 905 | } else { |
c7dabef8 | 906 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 907 | specp = &mem_spec; |
c7dabef8 | 908 | decode = 0; |
fd95541e | 909 | } |
d19cb803 BH |
910 | if (decode && res->flags & IORESOURCE_UNSET) { |
911 | p = string(p, pend, "size ", str_spec); | |
912 | p = number(p, pend, resource_size(res), *specp); | |
913 | } else { | |
914 | p = number(p, pend, res->start, *specp); | |
915 | if (res->start != res->end) { | |
916 | *p++ = '-'; | |
917 | p = number(p, pend, res->end, *specp); | |
918 | } | |
c91d3376 | 919 | } |
c7dabef8 | 920 | if (decode) { |
fd95541e BH |
921 | if (res->flags & IORESOURCE_MEM_64) |
922 | p = string(p, pend, " 64bit", str_spec); | |
923 | if (res->flags & IORESOURCE_PREFETCH) | |
924 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
925 | if (res->flags & IORESOURCE_WINDOW) |
926 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
927 | if (res->flags & IORESOURCE_DISABLED) |
928 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
929 | } else { |
930 | p = string(p, pend, " flags ", str_spec); | |
54433973 | 931 | p = number(p, pend, res->flags, default_flag_spec); |
fd95541e | 932 | } |
332d2e78 | 933 | *p++ = ']'; |
c7dabef8 | 934 | *p = '\0'; |
332d2e78 | 935 | |
fef20d9c | 936 | return string(buf, end, sym, spec); |
332d2e78 LT |
937 | } |
938 | ||
31550a16 AS |
939 | static noinline_for_stack |
940 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
941 | const char *fmt) | |
942 | { | |
360603a1 | 943 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
944 | negative value, fallback to the default */ |
945 | char separator; | |
946 | ||
947 | if (spec.field_width == 0) | |
948 | /* nothing to print */ | |
949 | return buf; | |
950 | ||
951 | if (ZERO_OR_NULL_PTR(addr)) | |
952 | /* NULL pointer */ | |
953 | return string(buf, end, NULL, spec); | |
954 | ||
955 | switch (fmt[1]) { | |
956 | case 'C': | |
957 | separator = ':'; | |
958 | break; | |
959 | case 'D': | |
960 | separator = '-'; | |
961 | break; | |
962 | case 'N': | |
963 | separator = 0; | |
964 | break; | |
965 | default: | |
966 | separator = ' '; | |
967 | break; | |
968 | } | |
969 | ||
970 | if (spec.field_width > 0) | |
971 | len = min_t(int, spec.field_width, 64); | |
972 | ||
9c98f235 RV |
973 | for (i = 0; i < len; ++i) { |
974 | if (buf < end) | |
975 | *buf = hex_asc_hi(addr[i]); | |
976 | ++buf; | |
977 | if (buf < end) | |
978 | *buf = hex_asc_lo(addr[i]); | |
979 | ++buf; | |
31550a16 | 980 | |
9c98f235 RV |
981 | if (separator && i != len - 1) { |
982 | if (buf < end) | |
983 | *buf = separator; | |
984 | ++buf; | |
985 | } | |
31550a16 AS |
986 | } |
987 | ||
988 | return buf; | |
989 | } | |
990 | ||
dbc760bc TH |
991 | static noinline_for_stack |
992 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
993 | struct printf_spec spec, const char *fmt) | |
994 | { | |
995 | const int CHUNKSZ = 32; | |
996 | int nr_bits = max_t(int, spec.field_width, 0); | |
997 | int i, chunksz; | |
998 | bool first = true; | |
999 | ||
1000 | /* reused to print numbers */ | |
1001 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
1002 | ||
1003 | chunksz = nr_bits & (CHUNKSZ - 1); | |
1004 | if (chunksz == 0) | |
1005 | chunksz = CHUNKSZ; | |
1006 | ||
1007 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
1008 | for (; i >= 0; i -= CHUNKSZ) { | |
1009 | u32 chunkmask, val; | |
1010 | int word, bit; | |
1011 | ||
1012 | chunkmask = ((1ULL << chunksz) - 1); | |
1013 | word = i / BITS_PER_LONG; | |
1014 | bit = i % BITS_PER_LONG; | |
1015 | val = (bitmap[word] >> bit) & chunkmask; | |
1016 | ||
1017 | if (!first) { | |
1018 | if (buf < end) | |
1019 | *buf = ','; | |
1020 | buf++; | |
1021 | } | |
1022 | first = false; | |
1023 | ||
1024 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
1025 | buf = number(buf, end, val, spec); | |
1026 | ||
1027 | chunksz = CHUNKSZ; | |
1028 | } | |
1029 | return buf; | |
1030 | } | |
1031 | ||
1032 | static noinline_for_stack | |
1033 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
1034 | struct printf_spec spec, const char *fmt) | |
1035 | { | |
1036 | int nr_bits = max_t(int, spec.field_width, 0); | |
1037 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
1038 | int cur, rbot, rtop; | |
1039 | bool first = true; | |
1040 | ||
dbc760bc TH |
1041 | rbot = cur = find_first_bit(bitmap, nr_bits); |
1042 | while (cur < nr_bits) { | |
1043 | rtop = cur; | |
1044 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
1045 | if (cur < nr_bits && cur <= rtop + 1) | |
1046 | continue; | |
1047 | ||
1048 | if (!first) { | |
1049 | if (buf < end) | |
1050 | *buf = ','; | |
1051 | buf++; | |
1052 | } | |
1053 | first = false; | |
1054 | ||
ce0b4910 | 1055 | buf = number(buf, end, rbot, default_dec_spec); |
dbc760bc TH |
1056 | if (rbot < rtop) { |
1057 | if (buf < end) | |
1058 | *buf = '-'; | |
1059 | buf++; | |
1060 | ||
ce0b4910 | 1061 | buf = number(buf, end, rtop, default_dec_spec); |
dbc760bc TH |
1062 | } |
1063 | ||
1064 | rbot = cur; | |
1065 | } | |
1066 | return buf; | |
1067 | } | |
1068 | ||
cf3b429b JP |
1069 | static noinline_for_stack |
1070 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
1071 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 1072 | { |
8a27f7c9 | 1073 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
1074 | char *p = mac_addr; |
1075 | int i; | |
bc7259a2 | 1076 | char separator; |
76597ff9 | 1077 | bool reversed = false; |
bc7259a2 | 1078 | |
76597ff9 AE |
1079 | switch (fmt[1]) { |
1080 | case 'F': | |
bc7259a2 | 1081 | separator = '-'; |
76597ff9 AE |
1082 | break; |
1083 | ||
1084 | case 'R': | |
1085 | reversed = true; | |
1086 | /* fall through */ | |
1087 | ||
1088 | default: | |
bc7259a2 | 1089 | separator = ':'; |
76597ff9 | 1090 | break; |
bc7259a2 | 1091 | } |
dd45c9cf HH |
1092 | |
1093 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
1094 | if (reversed) |
1095 | p = hex_byte_pack(p, addr[5 - i]); | |
1096 | else | |
1097 | p = hex_byte_pack(p, addr[i]); | |
1098 | ||
8a27f7c9 | 1099 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 1100 | *p++ = separator; |
dd45c9cf HH |
1101 | } |
1102 | *p = '\0'; | |
1103 | ||
fef20d9c | 1104 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
1105 | } |
1106 | ||
cf3b429b JP |
1107 | static noinline_for_stack |
1108 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
1109 | { |
1110 | int i; | |
0159f24e JP |
1111 | bool leading_zeros = (fmt[0] == 'i'); |
1112 | int index; | |
1113 | int step; | |
1114 | ||
1115 | switch (fmt[2]) { | |
1116 | case 'h': | |
1117 | #ifdef __BIG_ENDIAN | |
1118 | index = 0; | |
1119 | step = 1; | |
1120 | #else | |
1121 | index = 3; | |
1122 | step = -1; | |
1123 | #endif | |
1124 | break; | |
1125 | case 'l': | |
1126 | index = 3; | |
1127 | step = -1; | |
1128 | break; | |
1129 | case 'n': | |
1130 | case 'b': | |
1131 | default: | |
1132 | index = 0; | |
1133 | step = 1; | |
1134 | break; | |
1135 | } | |
8a27f7c9 | 1136 | for (i = 0; i < 4; i++) { |
7c43d9a3 | 1137 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ |
133fd9f5 | 1138 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
1139 | if (leading_zeros) { |
1140 | if (digits < 3) | |
1141 | *p++ = '0'; | |
1142 | if (digits < 2) | |
1143 | *p++ = '0'; | |
1144 | } | |
1145 | /* reverse the digits in the quad */ | |
1146 | while (digits--) | |
1147 | *p++ = temp[digits]; | |
1148 | if (i < 3) | |
1149 | *p++ = '.'; | |
0159f24e | 1150 | index += step; |
8a27f7c9 | 1151 | } |
8a27f7c9 | 1152 | *p = '\0'; |
7b9186f5 | 1153 | |
8a27f7c9 JP |
1154 | return p; |
1155 | } | |
1156 | ||
cf3b429b JP |
1157 | static noinline_for_stack |
1158 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 1159 | { |
7b9186f5 | 1160 | int i, j, range; |
8a27f7c9 JP |
1161 | unsigned char zerolength[8]; |
1162 | int longest = 1; | |
1163 | int colonpos = -1; | |
1164 | u16 word; | |
7b9186f5 | 1165 | u8 hi, lo; |
8a27f7c9 | 1166 | bool needcolon = false; |
eb78cd26 JP |
1167 | bool useIPv4; |
1168 | struct in6_addr in6; | |
1169 | ||
1170 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
1171 | ||
1172 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
1173 | |
1174 | memset(zerolength, 0, sizeof(zerolength)); | |
1175 | ||
1176 | if (useIPv4) | |
1177 | range = 6; | |
1178 | else | |
1179 | range = 8; | |
1180 | ||
1181 | /* find position of longest 0 run */ | |
1182 | for (i = 0; i < range; i++) { | |
1183 | for (j = i; j < range; j++) { | |
eb78cd26 | 1184 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
1185 | break; |
1186 | zerolength[i]++; | |
1187 | } | |
1188 | } | |
1189 | for (i = 0; i < range; i++) { | |
1190 | if (zerolength[i] > longest) { | |
1191 | longest = zerolength[i]; | |
1192 | colonpos = i; | |
1193 | } | |
1194 | } | |
29cf519e JP |
1195 | if (longest == 1) /* don't compress a single 0 */ |
1196 | colonpos = -1; | |
689afa7d | 1197 | |
8a27f7c9 JP |
1198 | /* emit address */ |
1199 | for (i = 0; i < range; i++) { | |
1200 | if (i == colonpos) { | |
1201 | if (needcolon || i == 0) | |
1202 | *p++ = ':'; | |
1203 | *p++ = ':'; | |
1204 | needcolon = false; | |
1205 | i += longest - 1; | |
1206 | continue; | |
1207 | } | |
1208 | if (needcolon) { | |
1209 | *p++ = ':'; | |
1210 | needcolon = false; | |
1211 | } | |
1212 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1213 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1214 | hi = word >> 8; |
1215 | lo = word & 0xff; | |
1216 | if (hi) { | |
1217 | if (hi > 0x0f) | |
55036ba7 | 1218 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1219 | else |
1220 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1221 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1222 | } |
b5ff992b | 1223 | else if (lo > 0x0f) |
55036ba7 | 1224 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1225 | else |
1226 | *p++ = hex_asc_lo(lo); | |
1227 | needcolon = true; | |
1228 | } | |
1229 | ||
1230 | if (useIPv4) { | |
1231 | if (needcolon) | |
1232 | *p++ = ':'; | |
0159f24e | 1233 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1234 | } |
8a27f7c9 | 1235 | *p = '\0'; |
7b9186f5 | 1236 | |
8a27f7c9 JP |
1237 | return p; |
1238 | } | |
1239 | ||
cf3b429b JP |
1240 | static noinline_for_stack |
1241 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1242 | { |
1243 | int i; | |
7b9186f5 | 1244 | |
689afa7d | 1245 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1246 | p = hex_byte_pack(p, *addr++); |
1247 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1248 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1249 | *p++ = ':'; |
1250 | } | |
1251 | *p = '\0'; | |
7b9186f5 | 1252 | |
8a27f7c9 JP |
1253 | return p; |
1254 | } | |
1255 | ||
cf3b429b JP |
1256 | static noinline_for_stack |
1257 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1258 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1259 | { |
1260 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1261 | ||
1262 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1263 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1264 | else |
eb78cd26 | 1265 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1266 | |
fef20d9c | 1267 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
1268 | } |
1269 | ||
cf3b429b JP |
1270 | static noinline_for_stack |
1271 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1272 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1273 | { |
8a27f7c9 | 1274 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1275 | |
0159f24e | 1276 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1277 | |
fef20d9c | 1278 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
1279 | } |
1280 | ||
10679643 DB |
1281 | static noinline_for_stack |
1282 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1283 | struct printf_spec spec, const char *fmt) | |
1284 | { | |
1285 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1286 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1287 | sizeof(":12345") + sizeof("/123456789") + | |
1288 | sizeof("%1234567890")]; | |
1289 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1290 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1291 | char fmt6[2] = { fmt[0], '6' }; | |
1292 | u8 off = 0; | |
1293 | ||
1294 | fmt++; | |
1295 | while (isalpha(*++fmt)) { | |
1296 | switch (*fmt) { | |
1297 | case 'p': | |
1298 | have_p = true; | |
1299 | break; | |
1300 | case 'f': | |
1301 | have_f = true; | |
1302 | break; | |
1303 | case 's': | |
1304 | have_s = true; | |
1305 | break; | |
1306 | case 'c': | |
1307 | have_c = true; | |
1308 | break; | |
1309 | } | |
1310 | } | |
1311 | ||
1312 | if (have_p || have_s || have_f) { | |
1313 | *p = '['; | |
1314 | off = 1; | |
1315 | } | |
1316 | ||
1317 | if (fmt6[0] == 'I' && have_c) | |
1318 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1319 | else | |
1320 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1321 | ||
1322 | if (have_p || have_s || have_f) | |
1323 | *p++ = ']'; | |
1324 | ||
1325 | if (have_p) { | |
1326 | *p++ = ':'; | |
1327 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1328 | } | |
1329 | if (have_f) { | |
1330 | *p++ = '/'; | |
1331 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1332 | IPV6_FLOWINFO_MASK), spec); | |
1333 | } | |
1334 | if (have_s) { | |
1335 | *p++ = '%'; | |
1336 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1337 | } | |
1338 | *p = '\0'; | |
1339 | ||
1340 | return string(buf, end, ip6_addr, spec); | |
1341 | } | |
1342 | ||
1343 | static noinline_for_stack | |
1344 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1345 | struct printf_spec spec, const char *fmt) | |
1346 | { | |
1347 | bool have_p = false; | |
1348 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1349 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1350 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1351 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1352 | ||
1353 | fmt++; | |
1354 | while (isalpha(*++fmt)) { | |
1355 | switch (*fmt) { | |
1356 | case 'p': | |
1357 | have_p = true; | |
1358 | break; | |
1359 | case 'h': | |
1360 | case 'l': | |
1361 | case 'n': | |
1362 | case 'b': | |
1363 | fmt4[2] = *fmt; | |
1364 | break; | |
1365 | } | |
1366 | } | |
1367 | ||
1368 | p = ip4_string(ip4_addr, addr, fmt4); | |
1369 | if (have_p) { | |
1370 | *p++ = ':'; | |
1371 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1372 | } | |
1373 | *p = '\0'; | |
1374 | ||
1375 | return string(buf, end, ip4_addr, spec); | |
1376 | } | |
1377 | ||
71dca95d AS |
1378 | static noinline_for_stack |
1379 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1380 | const char *fmt) | |
1381 | { | |
1382 | bool found = true; | |
1383 | int count = 1; | |
1384 | unsigned int flags = 0; | |
1385 | int len; | |
1386 | ||
1387 | if (spec.field_width == 0) | |
1388 | return buf; /* nothing to print */ | |
1389 | ||
1390 | if (ZERO_OR_NULL_PTR(addr)) | |
1391 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1392 | ||
1393 | ||
1394 | do { | |
1395 | switch (fmt[count++]) { | |
1396 | case 'a': | |
1397 | flags |= ESCAPE_ANY; | |
1398 | break; | |
1399 | case 'c': | |
1400 | flags |= ESCAPE_SPECIAL; | |
1401 | break; | |
1402 | case 'h': | |
1403 | flags |= ESCAPE_HEX; | |
1404 | break; | |
1405 | case 'n': | |
1406 | flags |= ESCAPE_NULL; | |
1407 | break; | |
1408 | case 'o': | |
1409 | flags |= ESCAPE_OCTAL; | |
1410 | break; | |
1411 | case 'p': | |
1412 | flags |= ESCAPE_NP; | |
1413 | break; | |
1414 | case 's': | |
1415 | flags |= ESCAPE_SPACE; | |
1416 | break; | |
1417 | default: | |
1418 | found = false; | |
1419 | break; | |
1420 | } | |
1421 | } while (found); | |
1422 | ||
1423 | if (!flags) | |
1424 | flags = ESCAPE_ANY_NP; | |
1425 | ||
1426 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1427 | ||
41416f23 RV |
1428 | /* |
1429 | * string_escape_mem() writes as many characters as it can to | |
1430 | * the given buffer, and returns the total size of the output | |
1431 | * had the buffer been big enough. | |
1432 | */ | |
1433 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
71dca95d AS |
1434 | |
1435 | return buf; | |
1436 | } | |
1437 | ||
cf3b429b JP |
1438 | static noinline_for_stack |
1439 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1440 | struct printf_spec spec, const char *fmt) | |
9ac6e44e | 1441 | { |
2b1b0d66 | 1442 | char uuid[UUID_STRING_LEN + 1]; |
9ac6e44e JP |
1443 | char *p = uuid; |
1444 | int i; | |
f9727a17 | 1445 | const u8 *index = uuid_index; |
9ac6e44e JP |
1446 | bool uc = false; |
1447 | ||
1448 | switch (*(++fmt)) { | |
1449 | case 'L': | |
1450 | uc = true; /* fall-through */ | |
1451 | case 'l': | |
f9727a17 | 1452 | index = guid_index; |
9ac6e44e JP |
1453 | break; |
1454 | case 'B': | |
1455 | uc = true; | |
1456 | break; | |
1457 | } | |
1458 | ||
1459 | for (i = 0; i < 16; i++) { | |
aa4ea1c3 AS |
1460 | if (uc) |
1461 | p = hex_byte_pack_upper(p, addr[index[i]]); | |
1462 | else | |
1463 | p = hex_byte_pack(p, addr[index[i]]); | |
9ac6e44e JP |
1464 | switch (i) { |
1465 | case 3: | |
1466 | case 5: | |
1467 | case 7: | |
1468 | case 9: | |
1469 | *p++ = '-'; | |
1470 | break; | |
1471 | } | |
1472 | } | |
1473 | ||
1474 | *p = 0; | |
1475 | ||
9ac6e44e JP |
1476 | return string(buf, end, uuid, spec); |
1477 | } | |
1478 | ||
57e73442 TH |
1479 | int kptr_restrict __read_mostly; |
1480 | ||
1481 | static noinline_for_stack | |
1482 | char *restricted_pointer(char *buf, char *end, const void *ptr, | |
1483 | struct printf_spec spec) | |
1484 | { | |
57e73442 TH |
1485 | switch (kptr_restrict) { |
1486 | case 0: | |
1487 | /* Always print %pK values */ | |
1488 | break; | |
1489 | case 1: { | |
1490 | const struct cred *cred; | |
1491 | ||
1492 | /* | |
1493 | * kptr_restrict==1 cannot be used in IRQ context | |
1494 | * because its test for CAP_SYSLOG would be meaningless. | |
1495 | */ | |
496a9a5f AS |
1496 | if (in_irq() || in_serving_softirq() || in_nmi()) { |
1497 | if (spec.field_width == -1) | |
1498 | spec.field_width = 2 * sizeof(ptr); | |
57e73442 | 1499 | return string(buf, end, "pK-error", spec); |
496a9a5f | 1500 | } |
57e73442 TH |
1501 | |
1502 | /* | |
1503 | * Only print the real pointer value if the current | |
1504 | * process has CAP_SYSLOG and is running with the | |
1505 | * same credentials it started with. This is because | |
1506 | * access to files is checked at open() time, but %pK | |
1507 | * checks permission at read() time. We don't want to | |
1508 | * leak pointer values if a binary opens a file using | |
1509 | * %pK and then elevates privileges before reading it. | |
1510 | */ | |
1511 | cred = current_cred(); | |
1512 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1513 | !uid_eq(cred->euid, cred->uid) || | |
1514 | !gid_eq(cred->egid, cred->gid)) | |
1515 | ptr = NULL; | |
1516 | break; | |
1517 | } | |
1518 | case 2: | |
1519 | default: | |
1520 | /* Always print 0's for %pK */ | |
1521 | ptr = NULL; | |
1522 | break; | |
1523 | } | |
1524 | ||
496a9a5f | 1525 | return pointer_string(buf, end, ptr, spec); |
57e73442 TH |
1526 | } |
1527 | ||
5b17aecf | 1528 | static noinline_for_stack |
431bca24 GU |
1529 | char *netdev_bits(char *buf, char *end, const void *addr, |
1530 | struct printf_spec spec, const char *fmt) | |
c8f44aff | 1531 | { |
5b17aecf AS |
1532 | unsigned long long num; |
1533 | int size; | |
1534 | ||
1535 | switch (fmt[1]) { | |
1536 | case 'F': | |
1537 | num = *(const netdev_features_t *)addr; | |
1538 | size = sizeof(netdev_features_t); | |
1539 | break; | |
1540 | default: | |
431bca24 | 1541 | return ptr_to_id(buf, end, addr, spec); |
5b17aecf | 1542 | } |
c8f44aff | 1543 | |
3cab1e71 | 1544 | return special_hex_number(buf, end, num, size); |
c8f44aff MM |
1545 | } |
1546 | ||
aaf07621 | 1547 | static noinline_for_stack |
3cab1e71 | 1548 | char *address_val(char *buf, char *end, const void *addr, const char *fmt) |
aaf07621 JP |
1549 | { |
1550 | unsigned long long num; | |
3cab1e71 | 1551 | int size; |
aaf07621 JP |
1552 | |
1553 | switch (fmt[1]) { | |
1554 | case 'd': | |
1555 | num = *(const dma_addr_t *)addr; | |
3cab1e71 | 1556 | size = sizeof(dma_addr_t); |
aaf07621 JP |
1557 | break; |
1558 | case 'p': | |
1559 | default: | |
1560 | num = *(const phys_addr_t *)addr; | |
3cab1e71 | 1561 | size = sizeof(phys_addr_t); |
aaf07621 JP |
1562 | break; |
1563 | } | |
1564 | ||
3cab1e71 | 1565 | return special_hex_number(buf, end, num, size); |
aaf07621 JP |
1566 | } |
1567 | ||
4d42c447 AS |
1568 | static noinline_for_stack |
1569 | char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r) | |
1570 | { | |
1571 | int year = tm->tm_year + (r ? 0 : 1900); | |
1572 | int mon = tm->tm_mon + (r ? 0 : 1); | |
1573 | ||
1574 | buf = number(buf, end, year, default_dec04_spec); | |
1575 | if (buf < end) | |
1576 | *buf = '-'; | |
1577 | buf++; | |
1578 | ||
1579 | buf = number(buf, end, mon, default_dec02_spec); | |
1580 | if (buf < end) | |
1581 | *buf = '-'; | |
1582 | buf++; | |
1583 | ||
1584 | return number(buf, end, tm->tm_mday, default_dec02_spec); | |
1585 | } | |
1586 | ||
1587 | static noinline_for_stack | |
1588 | char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r) | |
1589 | { | |
1590 | buf = number(buf, end, tm->tm_hour, default_dec02_spec); | |
1591 | if (buf < end) | |
1592 | *buf = ':'; | |
1593 | buf++; | |
1594 | ||
1595 | buf = number(buf, end, tm->tm_min, default_dec02_spec); | |
1596 | if (buf < end) | |
1597 | *buf = ':'; | |
1598 | buf++; | |
1599 | ||
1600 | return number(buf, end, tm->tm_sec, default_dec02_spec); | |
1601 | } | |
1602 | ||
1603 | static noinline_for_stack | |
1604 | char *rtc_str(char *buf, char *end, const struct rtc_time *tm, const char *fmt) | |
1605 | { | |
1606 | bool have_t = true, have_d = true; | |
1607 | bool raw = false; | |
1608 | int count = 2; | |
1609 | ||
1610 | switch (fmt[count]) { | |
1611 | case 'd': | |
1612 | have_t = false; | |
1613 | count++; | |
1614 | break; | |
1615 | case 't': | |
1616 | have_d = false; | |
1617 | count++; | |
1618 | break; | |
1619 | } | |
1620 | ||
1621 | raw = fmt[count] == 'r'; | |
1622 | ||
1623 | if (have_d) | |
1624 | buf = date_str(buf, end, tm, raw); | |
1625 | if (have_d && have_t) { | |
1626 | /* Respect ISO 8601 */ | |
1627 | if (buf < end) | |
1628 | *buf = 'T'; | |
1629 | buf++; | |
1630 | } | |
1631 | if (have_t) | |
1632 | buf = time_str(buf, end, tm, raw); | |
1633 | ||
1634 | return buf; | |
1635 | } | |
1636 | ||
1637 | static noinline_for_stack | |
1638 | char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec, | |
1639 | const char *fmt) | |
1640 | { | |
1641 | switch (fmt[1]) { | |
1642 | case 'R': | |
1643 | return rtc_str(buf, end, (const struct rtc_time *)ptr, fmt); | |
1644 | default: | |
1645 | return ptr_to_id(buf, end, ptr, spec); | |
1646 | } | |
1647 | } | |
1648 | ||
900cca29 GU |
1649 | static noinline_for_stack |
1650 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1651 | const char *fmt) | |
1652 | { | |
1653 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk) | |
1654 | return string(buf, end, NULL, spec); | |
1655 | ||
1656 | switch (fmt[1]) { | |
900cca29 GU |
1657 | case 'n': |
1658 | default: | |
1659 | #ifdef CONFIG_COMMON_CLK | |
1660 | return string(buf, end, __clk_get_name(clk), spec); | |
1661 | #else | |
ec12bc29 | 1662 | return ptr_to_id(buf, end, clk, spec); |
900cca29 GU |
1663 | #endif |
1664 | } | |
1665 | } | |
1666 | ||
edf14cdb VB |
1667 | static |
1668 | char *format_flags(char *buf, char *end, unsigned long flags, | |
1669 | const struct trace_print_flags *names) | |
1670 | { | |
1671 | unsigned long mask; | |
edf14cdb VB |
1672 | |
1673 | for ( ; flags && names->name; names++) { | |
1674 | mask = names->mask; | |
1675 | if ((flags & mask) != mask) | |
1676 | continue; | |
1677 | ||
abd4fe62 | 1678 | buf = string(buf, end, names->name, default_str_spec); |
edf14cdb VB |
1679 | |
1680 | flags &= ~mask; | |
1681 | if (flags) { | |
1682 | if (buf < end) | |
1683 | *buf = '|'; | |
1684 | buf++; | |
1685 | } | |
1686 | } | |
1687 | ||
1688 | if (flags) | |
54433973 | 1689 | buf = number(buf, end, flags, default_flag_spec); |
edf14cdb VB |
1690 | |
1691 | return buf; | |
1692 | } | |
1693 | ||
1694 | static noinline_for_stack | |
1695 | char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt) | |
1696 | { | |
1697 | unsigned long flags; | |
1698 | const struct trace_print_flags *names; | |
1699 | ||
1700 | switch (fmt[1]) { | |
1701 | case 'p': | |
1702 | flags = *(unsigned long *)flags_ptr; | |
1703 | /* Remove zone id */ | |
1704 | flags &= (1UL << NR_PAGEFLAGS) - 1; | |
1705 | names = pageflag_names; | |
1706 | break; | |
1707 | case 'v': | |
1708 | flags = *(unsigned long *)flags_ptr; | |
1709 | names = vmaflag_names; | |
1710 | break; | |
1711 | case 'g': | |
1712 | flags = *(gfp_t *)flags_ptr; | |
1713 | names = gfpflag_names; | |
1714 | break; | |
1715 | default: | |
1716 | WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]); | |
1717 | return buf; | |
1718 | } | |
1719 | ||
1720 | return format_flags(buf, end, flags, names); | |
1721 | } | |
1722 | ||
ce4fecf1 PA |
1723 | static const char *device_node_name_for_depth(const struct device_node *np, int depth) |
1724 | { | |
1725 | for ( ; np && depth; depth--) | |
1726 | np = np->parent; | |
1727 | ||
1728 | return kbasename(np->full_name); | |
1729 | } | |
1730 | ||
1731 | static noinline_for_stack | |
1732 | char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end) | |
1733 | { | |
1734 | int depth; | |
1735 | const struct device_node *parent = np->parent; | |
ce4fecf1 PA |
1736 | |
1737 | /* special case for root node */ | |
1738 | if (!parent) | |
abd4fe62 | 1739 | return string(buf, end, "/", default_str_spec); |
ce4fecf1 PA |
1740 | |
1741 | for (depth = 0; parent->parent; depth++) | |
1742 | parent = parent->parent; | |
1743 | ||
1744 | for ( ; depth >= 0; depth--) { | |
abd4fe62 | 1745 | buf = string(buf, end, "/", default_str_spec); |
ce4fecf1 | 1746 | buf = string(buf, end, device_node_name_for_depth(np, depth), |
abd4fe62 | 1747 | default_str_spec); |
ce4fecf1 PA |
1748 | } |
1749 | return buf; | |
1750 | } | |
1751 | ||
1752 | static noinline_for_stack | |
1753 | char *device_node_string(char *buf, char *end, struct device_node *dn, | |
1754 | struct printf_spec spec, const char *fmt) | |
1755 | { | |
1756 | char tbuf[sizeof("xxxx") + 1]; | |
1757 | const char *p; | |
1758 | int ret; | |
1759 | char *buf_start = buf; | |
1760 | struct property *prop; | |
1761 | bool has_mult, pass; | |
1762 | static const struct printf_spec num_spec = { | |
1763 | .flags = SMALL, | |
1764 | .field_width = -1, | |
1765 | .precision = -1, | |
1766 | .base = 10, | |
1767 | }; | |
1768 | ||
1769 | struct printf_spec str_spec = spec; | |
1770 | str_spec.field_width = -1; | |
1771 | ||
1772 | if (!IS_ENABLED(CONFIG_OF)) | |
1773 | return string(buf, end, "(!OF)", spec); | |
1774 | ||
1775 | if ((unsigned long)dn < PAGE_SIZE) | |
1776 | return string(buf, end, "(null)", spec); | |
1777 | ||
1778 | /* simple case without anything any more format specifiers */ | |
1779 | fmt++; | |
1780 | if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0) | |
1781 | fmt = "f"; | |
1782 | ||
1783 | for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) { | |
6d0a70a2 | 1784 | int precision; |
ce4fecf1 PA |
1785 | if (pass) { |
1786 | if (buf < end) | |
1787 | *buf = ':'; | |
1788 | buf++; | |
1789 | } | |
1790 | ||
1791 | switch (*fmt) { | |
1792 | case 'f': /* full_name */ | |
1793 | buf = device_node_gen_full_name(dn, buf, end); | |
1794 | break; | |
1795 | case 'n': /* name */ | |
6d0a70a2 RH |
1796 | p = kbasename(of_node_full_name(dn)); |
1797 | precision = str_spec.precision; | |
1798 | str_spec.precision = strchrnul(p, '@') - p; | |
1799 | buf = string(buf, end, p, str_spec); | |
1800 | str_spec.precision = precision; | |
ce4fecf1 PA |
1801 | break; |
1802 | case 'p': /* phandle */ | |
1803 | buf = number(buf, end, (unsigned int)dn->phandle, num_spec); | |
1804 | break; | |
1805 | case 'P': /* path-spec */ | |
1806 | p = kbasename(of_node_full_name(dn)); | |
1807 | if (!p[1]) | |
1808 | p = "/"; | |
1809 | buf = string(buf, end, p, str_spec); | |
1810 | break; | |
1811 | case 'F': /* flags */ | |
1812 | tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-'; | |
1813 | tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-'; | |
1814 | tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-'; | |
1815 | tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-'; | |
1816 | tbuf[4] = 0; | |
1817 | buf = string(buf, end, tbuf, str_spec); | |
1818 | break; | |
1819 | case 'c': /* major compatible string */ | |
1820 | ret = of_property_read_string(dn, "compatible", &p); | |
1821 | if (!ret) | |
1822 | buf = string(buf, end, p, str_spec); | |
1823 | break; | |
1824 | case 'C': /* full compatible string */ | |
1825 | has_mult = false; | |
1826 | of_property_for_each_string(dn, "compatible", prop, p) { | |
1827 | if (has_mult) | |
1828 | buf = string(buf, end, ",", str_spec); | |
1829 | buf = string(buf, end, "\"", str_spec); | |
1830 | buf = string(buf, end, p, str_spec); | |
1831 | buf = string(buf, end, "\"", str_spec); | |
1832 | ||
1833 | has_mult = true; | |
1834 | } | |
1835 | break; | |
1836 | default: | |
1837 | break; | |
1838 | } | |
1839 | } | |
1840 | ||
1841 | return widen_string(buf, buf - buf_start, end, spec); | |
1842 | } | |
1843 | ||
4d8a743c LT |
1844 | /* |
1845 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1846 | * by an extra set of alphanumeric characters that are extended format | |
1847 | * specifiers. | |
1848 | * | |
0b523769 JP |
1849 | * Please update scripts/checkpatch.pl when adding/removing conversion |
1850 | * characters. (Search for "check for vsprintf extension"). | |
1851 | * | |
332d2e78 LT |
1852 | * Right now we handle: |
1853 | * | |
cdb7e52d SS |
1854 | * - 'S' For symbolic direct pointers (or function descriptors) with offset |
1855 | * - 's' For symbolic direct pointers (or function descriptors) without offset | |
1856 | * - 'F' Same as 'S' | |
1857 | * - 'f' Same as 's' | |
b0d33c2b | 1858 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1859 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1860 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1861 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
1862 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
1863 | * width which must be explicitly specified either as part of the | |
1864 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1865 | * range-list format instead of hex format | |
dd45c9cf HH |
1866 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1867 | * usual colon-separated hex notation | |
8a27f7c9 | 1868 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1869 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1870 | * with a dash-separated hex notation |
7c59154e | 1871 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1872 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1873 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1874 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1875 | * [S][pfs] |
1876 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1877 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1878 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1879 | * IPv6 omits the colons (01020304...0f) | |
1880 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1881 | * [S][pfs] |
1882 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1883 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1884 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1885 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1886 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
1887 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
1888 | * of the following flags (see string_escape_mem() for the | |
1889 | * details): | |
1890 | * a - ESCAPE_ANY | |
1891 | * c - ESCAPE_SPECIAL | |
1892 | * h - ESCAPE_HEX | |
1893 | * n - ESCAPE_NULL | |
1894 | * o - ESCAPE_OCTAL | |
1895 | * p - ESCAPE_NP | |
1896 | * s - ESCAPE_SPACE | |
1897 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
1898 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1899 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1900 | * Options for %pU are: | |
1901 | * b big endian lower case hex (default) | |
1902 | * B big endian UPPER case hex | |
1903 | * l little endian lower case hex | |
1904 | * L little endian UPPER case hex | |
1905 | * big endian output byte order is: | |
1906 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1907 | * little endian output byte order is: | |
1908 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1909 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1910 | * call vsnprintf(->format, *->va_list). | |
1911 | * Implements a "recursive vsnprintf". | |
1912 | * Do not use this feature without some mechanism to verify the | |
1913 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1914 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1915 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1916 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1917 | * a certain separator (' ' by default): | |
1918 | * C colon | |
1919 | * D dash | |
1920 | * N no separator | |
1921 | * The maximum supported length is 64 bytes of the input. Consider | |
1922 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
1923 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1924 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
1925 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1926 | * - 'D[234]' Same as 'd' but for a struct file | |
1031bc58 | 1927 | * - 'g' For block_device name (gendisk + partition number) |
4d42c447 AS |
1928 | * - 't[R][dt][r]' For time and date as represented: |
1929 | * R struct rtc_time | |
900cca29 GU |
1930 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
1931 | * (legacy clock framework) of the clock | |
1932 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
1933 | * (legacy clock framework) of the clock | |
edf14cdb VB |
1934 | * - 'G' For flags to be printed as a collection of symbolic strings that would |
1935 | * construct the specific value. Supported flags given by option: | |
1936 | * p page flags (see struct page) given as pointer to unsigned long | |
1937 | * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t | |
1938 | * v vma flags (VM_*) given as pointer to unsigned long | |
94ac8f20 GU |
1939 | * - 'OF[fnpPcCF]' For a device tree object |
1940 | * Without any optional arguments prints the full_name | |
1941 | * f device node full_name | |
1942 | * n device node name | |
1943 | * p device node phandle | |
1944 | * P device node path spec (name + @unit) | |
1945 | * F device node flags | |
1946 | * c major compatible string | |
1947 | * C full compatible string | |
7b1924a1 TH |
1948 | * - 'x' For printing the address. Equivalent to "%lx". |
1949 | * | |
b3ed2321 TH |
1950 | * ** When making changes please also update: |
1951 | * Documentation/core-api/printk-formats.rst | |
9ac6e44e | 1952 | * |
ad67b74d TH |
1953 | * Note: The default behaviour (unadorned %p) is to hash the address, |
1954 | * rendering it useful as a unique identifier. | |
4d8a743c | 1955 | */ |
cf3b429b JP |
1956 | static noinline_for_stack |
1957 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1958 | struct printf_spec spec) | |
78a8bf69 | 1959 | { |
80c9eb46 | 1960 | const int default_width = 2 * sizeof(void *); |
725fe002 | 1961 | |
3a129cc2 | 1962 | if (!ptr && *fmt != 'K' && *fmt != 'x') { |
5e057981 JP |
1963 | /* |
1964 | * Print (null) with the same width as a pointer so it makes | |
1965 | * tabular output look nice. | |
1966 | */ | |
1967 | if (spec.field_width == -1) | |
725fe002 | 1968 | spec.field_width = default_width; |
fef20d9c | 1969 | return string(buf, end, "(null)", spec); |
5e057981 | 1970 | } |
d97106ab | 1971 | |
0fe1ef24 LT |
1972 | switch (*fmt) { |
1973 | case 'F': | |
0c8b946e | 1974 | case 'f': |
0fe1ef24 | 1975 | case 'S': |
9ac6e44e | 1976 | case 's': |
04b8eb7a SS |
1977 | ptr = dereference_symbol_descriptor(ptr); |
1978 | /* Fallthrough */ | |
0f77a8d3 | 1979 | case 'B': |
b0d33c2b | 1980 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1981 | case 'R': |
c7dabef8 | 1982 | case 'r': |
fd95541e | 1983 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1984 | case 'h': |
1985 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
1986 | case 'b': |
1987 | switch (fmt[1]) { | |
1988 | case 'l': | |
1989 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1990 | default: | |
1991 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1992 | } | |
8a27f7c9 JP |
1993 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1994 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1995 | /* [mM]F (FDDI) */ |
1996 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1997 | return mac_address_string(buf, end, ptr, spec, fmt); |
1998 | case 'I': /* Formatted IP supported | |
1999 | * 4: 1.2.3.4 | |
2000 | * 6: 0001:0203:...:0708 | |
2001 | * 6c: 1::708 or 1::1.2.3.4 | |
2002 | */ | |
2003 | case 'i': /* Contiguous: | |
2004 | * 4: 001.002.003.004 | |
2005 | * 6: 000102...0f | |
2006 | */ | |
2007 | switch (fmt[1]) { | |
2008 | case '6': | |
2009 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
2010 | case '4': | |
2011 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
2012 | case 'S': { |
2013 | const union { | |
2014 | struct sockaddr raw; | |
2015 | struct sockaddr_in v4; | |
2016 | struct sockaddr_in6 v6; | |
2017 | } *sa = ptr; | |
2018 | ||
2019 | switch (sa->raw.sa_family) { | |
2020 | case AF_INET: | |
2021 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
2022 | case AF_INET6: | |
2023 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
2024 | default: | |
2025 | return string(buf, end, "(invalid address)", spec); | |
2026 | }} | |
8a27f7c9 | 2027 | } |
fef20d9c | 2028 | break; |
71dca95d AS |
2029 | case 'E': |
2030 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
2031 | case 'U': |
2032 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 2033 | case 'V': |
5756b76e JB |
2034 | { |
2035 | va_list va; | |
2036 | ||
2037 | va_copy(va, *((struct va_format *)ptr)->va); | |
2038 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
2039 | ((struct va_format *)ptr)->fmt, va); | |
2040 | va_end(va); | |
2041 | return buf; | |
2042 | } | |
455cd5ab | 2043 | case 'K': |
ef0010a3 LT |
2044 | if (!kptr_restrict) |
2045 | break; | |
57e73442 | 2046 | return restricted_pointer(buf, end, ptr, spec); |
c8f44aff | 2047 | case 'N': |
431bca24 | 2048 | return netdev_bits(buf, end, ptr, spec, fmt); |
7d799210 | 2049 | case 'a': |
3cab1e71 | 2050 | return address_val(buf, end, ptr, fmt); |
4b6ccca7 AV |
2051 | case 'd': |
2052 | return dentry_name(buf, end, ptr, spec, fmt); | |
4d42c447 AS |
2053 | case 't': |
2054 | return time_and_date(buf, end, ptr, spec, fmt); | |
900cca29 GU |
2055 | case 'C': |
2056 | return clock(buf, end, ptr, spec, fmt); | |
4b6ccca7 AV |
2057 | case 'D': |
2058 | return dentry_name(buf, end, | |
2059 | ((const struct file *)ptr)->f_path.dentry, | |
2060 | spec, fmt); | |
1031bc58 DM |
2061 | #ifdef CONFIG_BLOCK |
2062 | case 'g': | |
2063 | return bdev_name(buf, end, ptr, spec, fmt); | |
2064 | #endif | |
2065 | ||
edf14cdb VB |
2066 | case 'G': |
2067 | return flags_string(buf, end, ptr, fmt); | |
ce4fecf1 PA |
2068 | case 'O': |
2069 | switch (fmt[1]) { | |
2070 | case 'F': | |
2071 | return device_node_string(buf, end, ptr, spec, fmt + 1); | |
2072 | } | |
554ec508 | 2073 | break; |
7b1924a1 TH |
2074 | case 'x': |
2075 | return pointer_string(buf, end, ptr, spec); | |
fef20d9c | 2076 | } |
fef20d9c | 2077 | |
ad67b74d TH |
2078 | /* default is to _not_ leak addresses, hash before printing */ |
2079 | return ptr_to_id(buf, end, ptr, spec); | |
fef20d9c FW |
2080 | } |
2081 | ||
2082 | /* | |
2083 | * Helper function to decode printf style format. | |
2084 | * Each call decode a token from the format and return the | |
2085 | * number of characters read (or likely the delta where it wants | |
2086 | * to go on the next call). | |
2087 | * The decoded token is returned through the parameters | |
2088 | * | |
2089 | * 'h', 'l', or 'L' for integer fields | |
2090 | * 'z' support added 23/7/1999 S.H. | |
2091 | * 'z' changed to 'Z' --davidm 1/25/99 | |
5b5e0928 | 2092 | * 'Z' changed to 'z' --adobriyan 2017-01-25 |
fef20d9c FW |
2093 | * 't' added for ptrdiff_t |
2094 | * | |
2095 | * @fmt: the format string | |
2096 | * @type of the token returned | |
2097 | * @flags: various flags such as +, -, # tokens.. | |
2098 | * @field_width: overwritten width | |
2099 | * @base: base of the number (octal, hex, ...) | |
2100 | * @precision: precision of a number | |
2101 | * @qualifier: qualifier of a number (long, size_t, ...) | |
2102 | */ | |
cf3b429b JP |
2103 | static noinline_for_stack |
2104 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
2105 | { |
2106 | const char *start = fmt; | |
d0484193 | 2107 | char qualifier; |
fef20d9c FW |
2108 | |
2109 | /* we finished early by reading the field width */ | |
ed681a91 | 2110 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
2111 | if (spec->field_width < 0) { |
2112 | spec->field_width = -spec->field_width; | |
2113 | spec->flags |= LEFT; | |
2114 | } | |
2115 | spec->type = FORMAT_TYPE_NONE; | |
2116 | goto precision; | |
2117 | } | |
2118 | ||
2119 | /* we finished early by reading the precision */ | |
2120 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
2121 | if (spec->precision < 0) | |
2122 | spec->precision = 0; | |
2123 | ||
2124 | spec->type = FORMAT_TYPE_NONE; | |
2125 | goto qualifier; | |
2126 | } | |
2127 | ||
2128 | /* By default */ | |
2129 | spec->type = FORMAT_TYPE_NONE; | |
2130 | ||
2131 | for (; *fmt ; ++fmt) { | |
2132 | if (*fmt == '%') | |
2133 | break; | |
2134 | } | |
2135 | ||
2136 | /* Return the current non-format string */ | |
2137 | if (fmt != start || !*fmt) | |
2138 | return fmt - start; | |
2139 | ||
2140 | /* Process flags */ | |
2141 | spec->flags = 0; | |
2142 | ||
2143 | while (1) { /* this also skips first '%' */ | |
2144 | bool found = true; | |
2145 | ||
2146 | ++fmt; | |
2147 | ||
2148 | switch (*fmt) { | |
2149 | case '-': spec->flags |= LEFT; break; | |
2150 | case '+': spec->flags |= PLUS; break; | |
2151 | case ' ': spec->flags |= SPACE; break; | |
2152 | case '#': spec->flags |= SPECIAL; break; | |
2153 | case '0': spec->flags |= ZEROPAD; break; | |
2154 | default: found = false; | |
2155 | } | |
2156 | ||
2157 | if (!found) | |
2158 | break; | |
2159 | } | |
2160 | ||
2161 | /* get field width */ | |
2162 | spec->field_width = -1; | |
2163 | ||
2164 | if (isdigit(*fmt)) | |
2165 | spec->field_width = skip_atoi(&fmt); | |
2166 | else if (*fmt == '*') { | |
2167 | /* it's the next argument */ | |
ed681a91 | 2168 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
2169 | return ++fmt - start; |
2170 | } | |
2171 | ||
2172 | precision: | |
2173 | /* get the precision */ | |
2174 | spec->precision = -1; | |
2175 | if (*fmt == '.') { | |
2176 | ++fmt; | |
2177 | if (isdigit(*fmt)) { | |
2178 | spec->precision = skip_atoi(&fmt); | |
2179 | if (spec->precision < 0) | |
2180 | spec->precision = 0; | |
2181 | } else if (*fmt == '*') { | |
2182 | /* it's the next argument */ | |
adf26f84 | 2183 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
2184 | return ++fmt - start; |
2185 | } | |
2186 | } | |
2187 | ||
2188 | qualifier: | |
2189 | /* get the conversion qualifier */ | |
d0484193 | 2190 | qualifier = 0; |
75fb8f26 | 2191 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
5b5e0928 | 2192 | *fmt == 'z' || *fmt == 't') { |
d0484193 RV |
2193 | qualifier = *fmt++; |
2194 | if (unlikely(qualifier == *fmt)) { | |
2195 | if (qualifier == 'l') { | |
2196 | qualifier = 'L'; | |
a4e94ef0 | 2197 | ++fmt; |
d0484193 RV |
2198 | } else if (qualifier == 'h') { |
2199 | qualifier = 'H'; | |
a4e94ef0 Z |
2200 | ++fmt; |
2201 | } | |
fef20d9c FW |
2202 | } |
2203 | } | |
2204 | ||
2205 | /* default base */ | |
2206 | spec->base = 10; | |
2207 | switch (*fmt) { | |
2208 | case 'c': | |
2209 | spec->type = FORMAT_TYPE_CHAR; | |
2210 | return ++fmt - start; | |
2211 | ||
2212 | case 's': | |
2213 | spec->type = FORMAT_TYPE_STR; | |
2214 | return ++fmt - start; | |
2215 | ||
2216 | case 'p': | |
2217 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 2218 | return ++fmt - start; |
fef20d9c | 2219 | |
fef20d9c FW |
2220 | case '%': |
2221 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
2222 | return ++fmt - start; | |
2223 | ||
2224 | /* integer number formats - set up the flags and "break" */ | |
2225 | case 'o': | |
2226 | spec->base = 8; | |
2227 | break; | |
2228 | ||
2229 | case 'x': | |
2230 | spec->flags |= SMALL; | |
7e6bd6f3 | 2231 | /* fall through */ |
fef20d9c FW |
2232 | |
2233 | case 'X': | |
2234 | spec->base = 16; | |
2235 | break; | |
2236 | ||
2237 | case 'd': | |
2238 | case 'i': | |
39e874f8 | 2239 | spec->flags |= SIGN; |
fef20d9c | 2240 | case 'u': |
4aa99606 | 2241 | break; |
fef20d9c | 2242 | |
708d96fd RM |
2243 | case 'n': |
2244 | /* | |
b006f19b RV |
2245 | * Since %n poses a greater security risk than |
2246 | * utility, treat it as any other invalid or | |
2247 | * unsupported format specifier. | |
708d96fd | 2248 | */ |
708d96fd RM |
2249 | /* Fall-through */ |
2250 | ||
fef20d9c | 2251 | default: |
b006f19b | 2252 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); |
fef20d9c FW |
2253 | spec->type = FORMAT_TYPE_INVALID; |
2254 | return fmt - start; | |
0fe1ef24 | 2255 | } |
fef20d9c | 2256 | |
d0484193 | 2257 | if (qualifier == 'L') |
fef20d9c | 2258 | spec->type = FORMAT_TYPE_LONG_LONG; |
d0484193 | 2259 | else if (qualifier == 'l') { |
51be17df RV |
2260 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
2261 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
5b5e0928 | 2262 | } else if (qualifier == 'z') { |
fef20d9c | 2263 | spec->type = FORMAT_TYPE_SIZE_T; |
d0484193 | 2264 | } else if (qualifier == 't') { |
fef20d9c | 2265 | spec->type = FORMAT_TYPE_PTRDIFF; |
d0484193 | 2266 | } else if (qualifier == 'H') { |
51be17df RV |
2267 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
2268 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
d0484193 | 2269 | } else if (qualifier == 'h') { |
51be17df RV |
2270 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
2271 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 2272 | } else { |
51be17df RV |
2273 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
2274 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 2275 | } |
fef20d9c FW |
2276 | |
2277 | return ++fmt - start; | |
78a8bf69 LT |
2278 | } |
2279 | ||
4d72ba01 RV |
2280 | static void |
2281 | set_field_width(struct printf_spec *spec, int width) | |
2282 | { | |
2283 | spec->field_width = width; | |
2284 | if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) { | |
2285 | spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX); | |
2286 | } | |
2287 | } | |
2288 | ||
2289 | static void | |
2290 | set_precision(struct printf_spec *spec, int prec) | |
2291 | { | |
2292 | spec->precision = prec; | |
2293 | if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) { | |
2294 | spec->precision = clamp(prec, 0, PRECISION_MAX); | |
2295 | } | |
2296 | } | |
2297 | ||
1da177e4 LT |
2298 | /** |
2299 | * vsnprintf - Format a string and place it in a buffer | |
2300 | * @buf: The buffer to place the result into | |
2301 | * @size: The size of the buffer, including the trailing null space | |
2302 | * @fmt: The format string to use | |
2303 | * @args: Arguments for the format string | |
2304 | * | |
d7ec9a05 RV |
2305 | * This function generally follows C99 vsnprintf, but has some |
2306 | * extensions and a few limitations: | |
2307 | * | |
6cc89134 MCC |
2308 | * - ``%n`` is unsupported |
2309 | * - ``%p*`` is handled by pointer() | |
5e4ee7b1 | 2310 | * |
27e7c0e8 | 2311 | * See pointer() or Documentation/core-api/printk-formats.rst for more |
5e4ee7b1 | 2312 | * extensive description. |
20036fdc | 2313 | * |
6cc89134 | 2314 | * **Please update the documentation in both places when making changes** |
80f548e0 | 2315 | * |
1da177e4 LT |
2316 | * The return value is the number of characters which would |
2317 | * be generated for the given input, excluding the trailing | |
2318 | * '\0', as per ISO C99. If you want to have the exact | |
2319 | * number of characters written into @buf as return value | |
72fd4a35 | 2320 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
2321 | * return is greater than or equal to @size, the resulting |
2322 | * string is truncated. | |
2323 | * | |
ba1835eb | 2324 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
2325 | */ |
2326 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2327 | { | |
1da177e4 | 2328 | unsigned long long num; |
d4be151b | 2329 | char *str, *end; |
fef20d9c | 2330 | struct printf_spec spec = {0}; |
1da177e4 | 2331 | |
f796937a JF |
2332 | /* Reject out-of-range values early. Large positive sizes are |
2333 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 2334 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 2335 | return 0; |
1da177e4 LT |
2336 | |
2337 | str = buf; | |
f796937a | 2338 | end = buf + size; |
1da177e4 | 2339 | |
f796937a JF |
2340 | /* Make sure end is always >= buf */ |
2341 | if (end < buf) { | |
2342 | end = ((void *)-1); | |
2343 | size = end - buf; | |
1da177e4 LT |
2344 | } |
2345 | ||
fef20d9c FW |
2346 | while (*fmt) { |
2347 | const char *old_fmt = fmt; | |
d4be151b | 2348 | int read = format_decode(fmt, &spec); |
1da177e4 | 2349 | |
fef20d9c | 2350 | fmt += read; |
1da177e4 | 2351 | |
fef20d9c FW |
2352 | switch (spec.type) { |
2353 | case FORMAT_TYPE_NONE: { | |
2354 | int copy = read; | |
2355 | if (str < end) { | |
2356 | if (copy > end - str) | |
2357 | copy = end - str; | |
2358 | memcpy(str, old_fmt, copy); | |
1da177e4 | 2359 | } |
fef20d9c FW |
2360 | str += read; |
2361 | break; | |
1da177e4 LT |
2362 | } |
2363 | ||
ed681a91 | 2364 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2365 | set_field_width(&spec, va_arg(args, int)); |
fef20d9c | 2366 | break; |
1da177e4 | 2367 | |
fef20d9c | 2368 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2369 | set_precision(&spec, va_arg(args, int)); |
fef20d9c | 2370 | break; |
1da177e4 | 2371 | |
d4be151b AGR |
2372 | case FORMAT_TYPE_CHAR: { |
2373 | char c; | |
2374 | ||
fef20d9c FW |
2375 | if (!(spec.flags & LEFT)) { |
2376 | while (--spec.field_width > 0) { | |
f796937a | 2377 | if (str < end) |
1da177e4 LT |
2378 | *str = ' '; |
2379 | ++str; | |
1da177e4 | 2380 | |
fef20d9c FW |
2381 | } |
2382 | } | |
2383 | c = (unsigned char) va_arg(args, int); | |
2384 | if (str < end) | |
2385 | *str = c; | |
2386 | ++str; | |
2387 | while (--spec.field_width > 0) { | |
f796937a | 2388 | if (str < end) |
fef20d9c | 2389 | *str = ' '; |
1da177e4 | 2390 | ++str; |
fef20d9c FW |
2391 | } |
2392 | break; | |
d4be151b | 2393 | } |
1da177e4 | 2394 | |
fef20d9c FW |
2395 | case FORMAT_TYPE_STR: |
2396 | str = string(str, end, va_arg(args, char *), spec); | |
2397 | break; | |
1da177e4 | 2398 | |
fef20d9c | 2399 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2400 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
2401 | spec); |
2402 | while (isalnum(*fmt)) | |
2403 | fmt++; | |
2404 | break; | |
1da177e4 | 2405 | |
fef20d9c FW |
2406 | case FORMAT_TYPE_PERCENT_CHAR: |
2407 | if (str < end) | |
2408 | *str = '%'; | |
2409 | ++str; | |
2410 | break; | |
1da177e4 | 2411 | |
fef20d9c | 2412 | case FORMAT_TYPE_INVALID: |
b006f19b RV |
2413 | /* |
2414 | * Presumably the arguments passed gcc's type | |
2415 | * checking, but there is no safe or sane way | |
2416 | * for us to continue parsing the format and | |
2417 | * fetching from the va_list; the remaining | |
2418 | * specifiers and arguments would be out of | |
2419 | * sync. | |
2420 | */ | |
2421 | goto out; | |
fef20d9c | 2422 | |
fef20d9c FW |
2423 | default: |
2424 | switch (spec.type) { | |
2425 | case FORMAT_TYPE_LONG_LONG: | |
2426 | num = va_arg(args, long long); | |
2427 | break; | |
2428 | case FORMAT_TYPE_ULONG: | |
2429 | num = va_arg(args, unsigned long); | |
2430 | break; | |
2431 | case FORMAT_TYPE_LONG: | |
2432 | num = va_arg(args, long); | |
2433 | break; | |
2434 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
2435 | if (spec.flags & SIGN) |
2436 | num = va_arg(args, ssize_t); | |
2437 | else | |
2438 | num = va_arg(args, size_t); | |
fef20d9c FW |
2439 | break; |
2440 | case FORMAT_TYPE_PTRDIFF: | |
2441 | num = va_arg(args, ptrdiff_t); | |
2442 | break; | |
a4e94ef0 Z |
2443 | case FORMAT_TYPE_UBYTE: |
2444 | num = (unsigned char) va_arg(args, int); | |
2445 | break; | |
2446 | case FORMAT_TYPE_BYTE: | |
2447 | num = (signed char) va_arg(args, int); | |
2448 | break; | |
fef20d9c FW |
2449 | case FORMAT_TYPE_USHORT: |
2450 | num = (unsigned short) va_arg(args, int); | |
2451 | break; | |
2452 | case FORMAT_TYPE_SHORT: | |
2453 | num = (short) va_arg(args, int); | |
2454 | break; | |
39e874f8 FW |
2455 | case FORMAT_TYPE_INT: |
2456 | num = (int) va_arg(args, int); | |
fef20d9c FW |
2457 | break; |
2458 | default: | |
2459 | num = va_arg(args, unsigned int); | |
2460 | } | |
2461 | ||
2462 | str = number(str, end, num, spec); | |
1da177e4 | 2463 | } |
1da177e4 | 2464 | } |
fef20d9c | 2465 | |
b006f19b | 2466 | out: |
f796937a JF |
2467 | if (size > 0) { |
2468 | if (str < end) | |
2469 | *str = '\0'; | |
2470 | else | |
0a6047ee | 2471 | end[-1] = '\0'; |
f796937a | 2472 | } |
fef20d9c | 2473 | |
f796937a | 2474 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 2475 | return str-buf; |
fef20d9c | 2476 | |
1da177e4 | 2477 | } |
1da177e4 LT |
2478 | EXPORT_SYMBOL(vsnprintf); |
2479 | ||
2480 | /** | |
2481 | * vscnprintf - Format a string and place it in a buffer | |
2482 | * @buf: The buffer to place the result into | |
2483 | * @size: The size of the buffer, including the trailing null space | |
2484 | * @fmt: The format string to use | |
2485 | * @args: Arguments for the format string | |
2486 | * | |
2487 | * The return value is the number of characters which have been written into | |
b921c69f | 2488 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
2489 | * returns 0. |
2490 | * | |
ba1835eb | 2491 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
2492 | * |
2493 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2494 | */ |
2495 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2496 | { | |
2497 | int i; | |
2498 | ||
7b9186f5 AGR |
2499 | i = vsnprintf(buf, size, fmt, args); |
2500 | ||
b921c69f AA |
2501 | if (likely(i < size)) |
2502 | return i; | |
2503 | if (size != 0) | |
2504 | return size - 1; | |
2505 | return 0; | |
1da177e4 | 2506 | } |
1da177e4 LT |
2507 | EXPORT_SYMBOL(vscnprintf); |
2508 | ||
2509 | /** | |
2510 | * snprintf - Format a string and place it in a buffer | |
2511 | * @buf: The buffer to place the result into | |
2512 | * @size: The size of the buffer, including the trailing null space | |
2513 | * @fmt: The format string to use | |
2514 | * @...: Arguments for the format string | |
2515 | * | |
2516 | * The return value is the number of characters which would be | |
2517 | * generated for the given input, excluding the trailing null, | |
2518 | * as per ISO C99. If the return is greater than or equal to | |
2519 | * @size, the resulting string is truncated. | |
20036fdc AK |
2520 | * |
2521 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2522 | */ |
7b9186f5 | 2523 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2524 | { |
2525 | va_list args; | |
2526 | int i; | |
2527 | ||
2528 | va_start(args, fmt); | |
7b9186f5 | 2529 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2530 | va_end(args); |
7b9186f5 | 2531 | |
1da177e4 LT |
2532 | return i; |
2533 | } | |
1da177e4 LT |
2534 | EXPORT_SYMBOL(snprintf); |
2535 | ||
2536 | /** | |
2537 | * scnprintf - Format a string and place it in a buffer | |
2538 | * @buf: The buffer to place the result into | |
2539 | * @size: The size of the buffer, including the trailing null space | |
2540 | * @fmt: The format string to use | |
2541 | * @...: Arguments for the format string | |
2542 | * | |
2543 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2544 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2545 | */ |
2546 | ||
7b9186f5 | 2547 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2548 | { |
2549 | va_list args; | |
2550 | int i; | |
2551 | ||
2552 | va_start(args, fmt); | |
b921c69f | 2553 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2554 | va_end(args); |
7b9186f5 | 2555 | |
b921c69f | 2556 | return i; |
1da177e4 LT |
2557 | } |
2558 | EXPORT_SYMBOL(scnprintf); | |
2559 | ||
2560 | /** | |
2561 | * vsprintf - Format a string and place it in a buffer | |
2562 | * @buf: The buffer to place the result into | |
2563 | * @fmt: The format string to use | |
2564 | * @args: Arguments for the format string | |
2565 | * | |
2566 | * The function returns the number of characters written | |
72fd4a35 | 2567 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2568 | * buffer overflows. |
2569 | * | |
ba1835eb | 2570 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2571 | * |
2572 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2573 | */ |
2574 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2575 | { | |
2576 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2577 | } | |
1da177e4 LT |
2578 | EXPORT_SYMBOL(vsprintf); |
2579 | ||
2580 | /** | |
2581 | * sprintf - Format a string and place it in a buffer | |
2582 | * @buf: The buffer to place the result into | |
2583 | * @fmt: The format string to use | |
2584 | * @...: Arguments for the format string | |
2585 | * | |
2586 | * The function returns the number of characters written | |
72fd4a35 | 2587 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2588 | * buffer overflows. |
20036fdc AK |
2589 | * |
2590 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2591 | */ |
7b9186f5 | 2592 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2593 | { |
2594 | va_list args; | |
2595 | int i; | |
2596 | ||
2597 | va_start(args, fmt); | |
7b9186f5 | 2598 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2599 | va_end(args); |
7b9186f5 | 2600 | |
1da177e4 LT |
2601 | return i; |
2602 | } | |
1da177e4 LT |
2603 | EXPORT_SYMBOL(sprintf); |
2604 | ||
4370aa4a LJ |
2605 | #ifdef CONFIG_BINARY_PRINTF |
2606 | /* | |
2607 | * bprintf service: | |
2608 | * vbin_printf() - VA arguments to binary data | |
2609 | * bstr_printf() - Binary data to text string | |
2610 | */ | |
2611 | ||
2612 | /** | |
2613 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2614 | * @bin_buf: The buffer to place args' binary value | |
2615 | * @size: The size of the buffer(by words(32bits), not characters) | |
2616 | * @fmt: The format string to use | |
2617 | * @args: Arguments for the format string | |
2618 | * | |
2619 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2620 | * is skipped. |
4370aa4a LJ |
2621 | * |
2622 | * The return value is the number of words(32bits) which would be generated for | |
2623 | * the given input. | |
2624 | * | |
2625 | * NOTE: | |
2626 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2627 | * valid for bstr_printf(). | |
2628 | */ | |
2629 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2630 | { | |
fef20d9c | 2631 | struct printf_spec spec = {0}; |
4370aa4a | 2632 | char *str, *end; |
841a915d | 2633 | int width; |
4370aa4a LJ |
2634 | |
2635 | str = (char *)bin_buf; | |
2636 | end = (char *)(bin_buf + size); | |
2637 | ||
2638 | #define save_arg(type) \ | |
841a915d SRV |
2639 | ({ \ |
2640 | unsigned long long value; \ | |
4370aa4a | 2641 | if (sizeof(type) == 8) { \ |
841a915d | 2642 | unsigned long long val8; \ |
4370aa4a | 2643 | str = PTR_ALIGN(str, sizeof(u32)); \ |
841a915d | 2644 | val8 = va_arg(args, unsigned long long); \ |
4370aa4a | 2645 | if (str + sizeof(type) <= end) { \ |
841a915d SRV |
2646 | *(u32 *)str = *(u32 *)&val8; \ |
2647 | *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \ | |
4370aa4a | 2648 | } \ |
841a915d | 2649 | value = val8; \ |
4370aa4a | 2650 | } else { \ |
841a915d | 2651 | unsigned int val4; \ |
4370aa4a | 2652 | str = PTR_ALIGN(str, sizeof(type)); \ |
841a915d | 2653 | val4 = va_arg(args, int); \ |
4370aa4a | 2654 | if (str + sizeof(type) <= end) \ |
841a915d SRV |
2655 | *(typeof(type) *)str = (type)(long)val4; \ |
2656 | value = (unsigned long long)val4; \ | |
4370aa4a LJ |
2657 | } \ |
2658 | str += sizeof(type); \ | |
841a915d SRV |
2659 | value; \ |
2660 | }) | |
4370aa4a | 2661 | |
fef20d9c | 2662 | while (*fmt) { |
d4be151b | 2663 | int read = format_decode(fmt, &spec); |
4370aa4a | 2664 | |
fef20d9c | 2665 | fmt += read; |
4370aa4a | 2666 | |
fef20d9c FW |
2667 | switch (spec.type) { |
2668 | case FORMAT_TYPE_NONE: | |
d4be151b | 2669 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2670 | break; |
b006f19b RV |
2671 | case FORMAT_TYPE_INVALID: |
2672 | goto out; | |
fef20d9c | 2673 | |
ed681a91 | 2674 | case FORMAT_TYPE_WIDTH: |
fef20d9c | 2675 | case FORMAT_TYPE_PRECISION: |
841a915d SRV |
2676 | width = (int)save_arg(int); |
2677 | /* Pointers may require the width */ | |
2678 | if (*fmt == 'p') | |
2679 | set_field_width(&spec, width); | |
fef20d9c FW |
2680 | break; |
2681 | ||
2682 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2683 | save_arg(char); |
fef20d9c FW |
2684 | break; |
2685 | ||
2686 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
2687 | const char *save_str = va_arg(args, char *); |
2688 | size_t len; | |
6c356634 | 2689 | |
4370aa4a LJ |
2690 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2691 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 2692 | save_str = "(null)"; |
6c356634 AGR |
2693 | len = strlen(save_str) + 1; |
2694 | if (str + len < end) | |
2695 | memcpy(str, save_str, len); | |
2696 | str += len; | |
fef20d9c | 2697 | break; |
4370aa4a | 2698 | } |
fef20d9c FW |
2699 | |
2700 | case FORMAT_TYPE_PTR: | |
841a915d SRV |
2701 | /* Dereferenced pointers must be done now */ |
2702 | switch (*fmt) { | |
2703 | /* Dereference of functions is still OK */ | |
2704 | case 'S': | |
2705 | case 's': | |
2706 | case 'F': | |
2707 | case 'f': | |
1e6338cf SRV |
2708 | case 'x': |
2709 | case 'K': | |
841a915d SRV |
2710 | save_arg(void *); |
2711 | break; | |
2712 | default: | |
2713 | if (!isalnum(*fmt)) { | |
2714 | save_arg(void *); | |
2715 | break; | |
2716 | } | |
2717 | str = pointer(fmt, str, end, va_arg(args, void *), | |
2718 | spec); | |
2719 | if (str + 1 < end) | |
2720 | *str++ = '\0'; | |
2721 | else | |
2722 | end[-1] = '\0'; /* Must be nul terminated */ | |
2723 | } | |
4370aa4a | 2724 | /* skip all alphanumeric pointer suffixes */ |
fef20d9c | 2725 | while (isalnum(*fmt)) |
4370aa4a | 2726 | fmt++; |
fef20d9c FW |
2727 | break; |
2728 | ||
fef20d9c FW |
2729 | default: |
2730 | switch (spec.type) { | |
2731 | ||
2732 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2733 | save_arg(long long); |
fef20d9c FW |
2734 | break; |
2735 | case FORMAT_TYPE_ULONG: | |
2736 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2737 | save_arg(unsigned long); |
fef20d9c FW |
2738 | break; |
2739 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2740 | save_arg(size_t); |
fef20d9c FW |
2741 | break; |
2742 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2743 | save_arg(ptrdiff_t); |
fef20d9c | 2744 | break; |
a4e94ef0 Z |
2745 | case FORMAT_TYPE_UBYTE: |
2746 | case FORMAT_TYPE_BYTE: | |
2747 | save_arg(char); | |
2748 | break; | |
fef20d9c FW |
2749 | case FORMAT_TYPE_USHORT: |
2750 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2751 | save_arg(short); |
fef20d9c FW |
2752 | break; |
2753 | default: | |
4370aa4a | 2754 | save_arg(int); |
fef20d9c | 2755 | } |
4370aa4a LJ |
2756 | } |
2757 | } | |
fef20d9c | 2758 | |
b006f19b | 2759 | out: |
7b9186f5 | 2760 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2761 | #undef save_arg |
4370aa4a LJ |
2762 | } |
2763 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2764 | ||
2765 | /** | |
2766 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2767 | * @buf: The buffer to place the result into | |
2768 | * @size: The size of the buffer, including the trailing null space | |
2769 | * @fmt: The format string to use | |
2770 | * @bin_buf: Binary arguments for the format string | |
2771 | * | |
2772 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2773 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2774 | * a binary buffer that generated by vbin_printf. | |
2775 | * | |
2776 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2777 | * see vsnprintf comment for details. |
4370aa4a LJ |
2778 | * |
2779 | * The return value is the number of characters which would | |
2780 | * be generated for the given input, excluding the trailing | |
2781 | * '\0', as per ISO C99. If you want to have the exact | |
2782 | * number of characters written into @buf as return value | |
2783 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2784 | * return is greater than or equal to @size, the resulting | |
2785 | * string is truncated. | |
2786 | */ | |
2787 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2788 | { | |
fef20d9c | 2789 | struct printf_spec spec = {0}; |
d4be151b AGR |
2790 | char *str, *end; |
2791 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2792 | |
762abb51 | 2793 | if (WARN_ON_ONCE(size > INT_MAX)) |
4370aa4a | 2794 | return 0; |
4370aa4a LJ |
2795 | |
2796 | str = buf; | |
2797 | end = buf + size; | |
2798 | ||
2799 | #define get_arg(type) \ | |
2800 | ({ \ | |
2801 | typeof(type) value; \ | |
2802 | if (sizeof(type) == 8) { \ | |
2803 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2804 | *(u32 *)&value = *(u32 *)args; \ | |
2805 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2806 | } else { \ | |
2807 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2808 | value = *(typeof(type) *)args; \ | |
2809 | } \ | |
2810 | args += sizeof(type); \ | |
2811 | value; \ | |
2812 | }) | |
2813 | ||
2814 | /* Make sure end is always >= buf */ | |
2815 | if (end < buf) { | |
2816 | end = ((void *)-1); | |
2817 | size = end - buf; | |
2818 | } | |
2819 | ||
fef20d9c | 2820 | while (*fmt) { |
fef20d9c | 2821 | const char *old_fmt = fmt; |
d4be151b | 2822 | int read = format_decode(fmt, &spec); |
4370aa4a | 2823 | |
fef20d9c | 2824 | fmt += read; |
4370aa4a | 2825 | |
fef20d9c FW |
2826 | switch (spec.type) { |
2827 | case FORMAT_TYPE_NONE: { | |
2828 | int copy = read; | |
2829 | if (str < end) { | |
2830 | if (copy > end - str) | |
2831 | copy = end - str; | |
2832 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2833 | } |
fef20d9c FW |
2834 | str += read; |
2835 | break; | |
4370aa4a LJ |
2836 | } |
2837 | ||
ed681a91 | 2838 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2839 | set_field_width(&spec, get_arg(int)); |
fef20d9c | 2840 | break; |
4370aa4a | 2841 | |
fef20d9c | 2842 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2843 | set_precision(&spec, get_arg(int)); |
fef20d9c | 2844 | break; |
4370aa4a | 2845 | |
d4be151b AGR |
2846 | case FORMAT_TYPE_CHAR: { |
2847 | char c; | |
2848 | ||
fef20d9c FW |
2849 | if (!(spec.flags & LEFT)) { |
2850 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2851 | if (str < end) |
2852 | *str = ' '; | |
2853 | ++str; | |
2854 | } | |
2855 | } | |
2856 | c = (unsigned char) get_arg(char); | |
2857 | if (str < end) | |
2858 | *str = c; | |
2859 | ++str; | |
fef20d9c | 2860 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2861 | if (str < end) |
2862 | *str = ' '; | |
2863 | ++str; | |
2864 | } | |
fef20d9c | 2865 | break; |
d4be151b | 2866 | } |
4370aa4a | 2867 | |
fef20d9c | 2868 | case FORMAT_TYPE_STR: { |
4370aa4a | 2869 | const char *str_arg = args; |
d4be151b | 2870 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2871 | str = string(str, end, (char *)str_arg, spec); |
2872 | break; | |
4370aa4a LJ |
2873 | } |
2874 | ||
841a915d SRV |
2875 | case FORMAT_TYPE_PTR: { |
2876 | bool process = false; | |
2877 | int copy, len; | |
2878 | /* Non function dereferences were already done */ | |
2879 | switch (*fmt) { | |
2880 | case 'S': | |
2881 | case 's': | |
2882 | case 'F': | |
2883 | case 'f': | |
1e6338cf SRV |
2884 | case 'x': |
2885 | case 'K': | |
841a915d SRV |
2886 | process = true; |
2887 | break; | |
2888 | default: | |
2889 | if (!isalnum(*fmt)) { | |
2890 | process = true; | |
2891 | break; | |
2892 | } | |
2893 | /* Pointer dereference was already processed */ | |
2894 | if (str < end) { | |
2895 | len = copy = strlen(args); | |
2896 | if (copy > end - str) | |
2897 | copy = end - str; | |
2898 | memcpy(str, args, copy); | |
2899 | str += len; | |
62165600 | 2900 | args += len + 1; |
841a915d SRV |
2901 | } |
2902 | } | |
2903 | if (process) | |
2904 | str = pointer(fmt, str, end, get_arg(void *), spec); | |
2905 | ||
fef20d9c | 2906 | while (isalnum(*fmt)) |
4370aa4a | 2907 | fmt++; |
fef20d9c | 2908 | break; |
841a915d | 2909 | } |
4370aa4a | 2910 | |
fef20d9c | 2911 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
2912 | if (str < end) |
2913 | *str = '%'; | |
2914 | ++str; | |
fef20d9c FW |
2915 | break; |
2916 | ||
b006f19b RV |
2917 | case FORMAT_TYPE_INVALID: |
2918 | goto out; | |
2919 | ||
d4be151b AGR |
2920 | default: { |
2921 | unsigned long long num; | |
2922 | ||
fef20d9c FW |
2923 | switch (spec.type) { |
2924 | ||
2925 | case FORMAT_TYPE_LONG_LONG: | |
2926 | num = get_arg(long long); | |
2927 | break; | |
2928 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2929 | case FORMAT_TYPE_LONG: |
2930 | num = get_arg(unsigned long); | |
2931 | break; | |
2932 | case FORMAT_TYPE_SIZE_T: | |
2933 | num = get_arg(size_t); | |
2934 | break; | |
2935 | case FORMAT_TYPE_PTRDIFF: | |
2936 | num = get_arg(ptrdiff_t); | |
2937 | break; | |
a4e94ef0 Z |
2938 | case FORMAT_TYPE_UBYTE: |
2939 | num = get_arg(unsigned char); | |
2940 | break; | |
2941 | case FORMAT_TYPE_BYTE: | |
2942 | num = get_arg(signed char); | |
2943 | break; | |
fef20d9c FW |
2944 | case FORMAT_TYPE_USHORT: |
2945 | num = get_arg(unsigned short); | |
2946 | break; | |
2947 | case FORMAT_TYPE_SHORT: | |
2948 | num = get_arg(short); | |
2949 | break; | |
2950 | case FORMAT_TYPE_UINT: | |
2951 | num = get_arg(unsigned int); | |
2952 | break; | |
2953 | default: | |
2954 | num = get_arg(int); | |
2955 | } | |
2956 | ||
2957 | str = number(str, end, num, spec); | |
d4be151b AGR |
2958 | } /* default: */ |
2959 | } /* switch(spec.type) */ | |
2960 | } /* while(*fmt) */ | |
fef20d9c | 2961 | |
b006f19b | 2962 | out: |
4370aa4a LJ |
2963 | if (size > 0) { |
2964 | if (str < end) | |
2965 | *str = '\0'; | |
2966 | else | |
2967 | end[-1] = '\0'; | |
2968 | } | |
fef20d9c | 2969 | |
4370aa4a LJ |
2970 | #undef get_arg |
2971 | ||
2972 | /* the trailing null byte doesn't count towards the total */ | |
2973 | return str - buf; | |
2974 | } | |
2975 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2976 | ||
2977 | /** | |
2978 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2979 | * @bin_buf: The buffer to place args' binary value | |
2980 | * @size: The size of the buffer(by words(32bits), not characters) | |
2981 | * @fmt: The format string to use | |
2982 | * @...: Arguments for the format string | |
2983 | * | |
2984 | * The function returns the number of words(u32) written | |
2985 | * into @bin_buf. | |
2986 | */ | |
2987 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2988 | { | |
2989 | va_list args; | |
2990 | int ret; | |
2991 | ||
2992 | va_start(args, fmt); | |
2993 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2994 | va_end(args); | |
7b9186f5 | 2995 | |
4370aa4a LJ |
2996 | return ret; |
2997 | } | |
2998 | EXPORT_SYMBOL_GPL(bprintf); | |
2999 | ||
3000 | #endif /* CONFIG_BINARY_PRINTF */ | |
3001 | ||
1da177e4 LT |
3002 | /** |
3003 | * vsscanf - Unformat a buffer into a list of arguments | |
3004 | * @buf: input buffer | |
3005 | * @fmt: format of buffer | |
3006 | * @args: arguments | |
3007 | */ | |
7b9186f5 | 3008 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
3009 | { |
3010 | const char *str = buf; | |
3011 | char *next; | |
3012 | char digit; | |
3013 | int num = 0; | |
ef0658f3 | 3014 | u8 qualifier; |
53809751 JB |
3015 | unsigned int base; |
3016 | union { | |
3017 | long long s; | |
3018 | unsigned long long u; | |
3019 | } val; | |
ef0658f3 | 3020 | s16 field_width; |
d4be151b | 3021 | bool is_sign; |
1da177e4 | 3022 | |
da99075c | 3023 | while (*fmt) { |
1da177e4 LT |
3024 | /* skip any white space in format */ |
3025 | /* white space in format matchs any amount of | |
3026 | * white space, including none, in the input. | |
3027 | */ | |
3028 | if (isspace(*fmt)) { | |
e7d2860b AGR |
3029 | fmt = skip_spaces(++fmt); |
3030 | str = skip_spaces(str); | |
1da177e4 LT |
3031 | } |
3032 | ||
3033 | /* anything that is not a conversion must match exactly */ | |
3034 | if (*fmt != '%' && *fmt) { | |
3035 | if (*fmt++ != *str++) | |
3036 | break; | |
3037 | continue; | |
3038 | } | |
3039 | ||
3040 | if (!*fmt) | |
3041 | break; | |
3042 | ++fmt; | |
7b9186f5 | 3043 | |
1da177e4 LT |
3044 | /* skip this conversion. |
3045 | * advance both strings to next white space | |
3046 | */ | |
3047 | if (*fmt == '*') { | |
da99075c JB |
3048 | if (!*str) |
3049 | break; | |
f9310b2f JY |
3050 | while (!isspace(*fmt) && *fmt != '%' && *fmt) { |
3051 | /* '%*[' not yet supported, invalid format */ | |
3052 | if (*fmt == '[') | |
3053 | return num; | |
1da177e4 | 3054 | fmt++; |
f9310b2f | 3055 | } |
1da177e4 LT |
3056 | while (!isspace(*str) && *str) |
3057 | str++; | |
3058 | continue; | |
3059 | } | |
3060 | ||
3061 | /* get field width */ | |
3062 | field_width = -1; | |
53809751 | 3063 | if (isdigit(*fmt)) { |
1da177e4 | 3064 | field_width = skip_atoi(&fmt); |
53809751 JB |
3065 | if (field_width <= 0) |
3066 | break; | |
3067 | } | |
1da177e4 LT |
3068 | |
3069 | /* get conversion qualifier */ | |
3070 | qualifier = -1; | |
75fb8f26 | 3071 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
5b5e0928 | 3072 | *fmt == 'z') { |
1da177e4 LT |
3073 | qualifier = *fmt++; |
3074 | if (unlikely(qualifier == *fmt)) { | |
3075 | if (qualifier == 'h') { | |
3076 | qualifier = 'H'; | |
3077 | fmt++; | |
3078 | } else if (qualifier == 'l') { | |
3079 | qualifier = 'L'; | |
3080 | fmt++; | |
3081 | } | |
3082 | } | |
3083 | } | |
1da177e4 | 3084 | |
da99075c JB |
3085 | if (!*fmt) |
3086 | break; | |
3087 | ||
3088 | if (*fmt == 'n') { | |
3089 | /* return number of characters read so far */ | |
3090 | *va_arg(args, int *) = str - buf; | |
3091 | ++fmt; | |
3092 | continue; | |
3093 | } | |
3094 | ||
3095 | if (!*str) | |
1da177e4 LT |
3096 | break; |
3097 | ||
d4be151b | 3098 | base = 10; |
3f623eba | 3099 | is_sign = false; |
d4be151b | 3100 | |
7b9186f5 | 3101 | switch (*fmt++) { |
1da177e4 LT |
3102 | case 'c': |
3103 | { | |
7b9186f5 | 3104 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
3105 | if (field_width == -1) |
3106 | field_width = 1; | |
3107 | do { | |
3108 | *s++ = *str++; | |
3109 | } while (--field_width > 0 && *str); | |
3110 | num++; | |
3111 | } | |
3112 | continue; | |
3113 | case 's': | |
3114 | { | |
7b9186f5 AGR |
3115 | char *s = (char *)va_arg(args, char *); |
3116 | if (field_width == -1) | |
4be929be | 3117 | field_width = SHRT_MAX; |
1da177e4 | 3118 | /* first, skip leading white space in buffer */ |
e7d2860b | 3119 | str = skip_spaces(str); |
1da177e4 LT |
3120 | |
3121 | /* now copy until next white space */ | |
7b9186f5 | 3122 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 3123 | *s++ = *str++; |
1da177e4 LT |
3124 | *s = '\0'; |
3125 | num++; | |
3126 | } | |
3127 | continue; | |
f9310b2f JY |
3128 | /* |
3129 | * Warning: This implementation of the '[' conversion specifier | |
3130 | * deviates from its glibc counterpart in the following ways: | |
3131 | * (1) It does NOT support ranges i.e. '-' is NOT a special | |
3132 | * character | |
3133 | * (2) It cannot match the closing bracket ']' itself | |
3134 | * (3) A field width is required | |
3135 | * (4) '%*[' (discard matching input) is currently not supported | |
3136 | * | |
3137 | * Example usage: | |
3138 | * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]", | |
3139 | * buf1, buf2, buf3); | |
3140 | * if (ret < 3) | |
3141 | * // etc.. | |
3142 | */ | |
3143 | case '[': | |
3144 | { | |
3145 | char *s = (char *)va_arg(args, char *); | |
3146 | DECLARE_BITMAP(set, 256) = {0}; | |
3147 | unsigned int len = 0; | |
3148 | bool negate = (*fmt == '^'); | |
3149 | ||
3150 | /* field width is required */ | |
3151 | if (field_width == -1) | |
3152 | return num; | |
3153 | ||
3154 | if (negate) | |
3155 | ++fmt; | |
3156 | ||
3157 | for ( ; *fmt && *fmt != ']'; ++fmt, ++len) | |
3158 | set_bit((u8)*fmt, set); | |
3159 | ||
3160 | /* no ']' or no character set found */ | |
3161 | if (!*fmt || !len) | |
3162 | return num; | |
3163 | ++fmt; | |
3164 | ||
3165 | if (negate) { | |
3166 | bitmap_complement(set, set, 256); | |
3167 | /* exclude null '\0' byte */ | |
3168 | clear_bit(0, set); | |
3169 | } | |
3170 | ||
3171 | /* match must be non-empty */ | |
3172 | if (!test_bit((u8)*str, set)) | |
3173 | return num; | |
3174 | ||
3175 | while (test_bit((u8)*str, set) && field_width--) | |
3176 | *s++ = *str++; | |
3177 | *s = '\0'; | |
3178 | ++num; | |
3179 | } | |
3180 | continue; | |
1da177e4 LT |
3181 | case 'o': |
3182 | base = 8; | |
3183 | break; | |
3184 | case 'x': | |
3185 | case 'X': | |
3186 | base = 16; | |
3187 | break; | |
3188 | case 'i': | |
7b9186f5 | 3189 | base = 0; |
7e6bd6f3 | 3190 | /* fall through */ |
1da177e4 | 3191 | case 'd': |
3f623eba | 3192 | is_sign = true; |
7e6bd6f3 | 3193 | /* fall through */ |
1da177e4 LT |
3194 | case 'u': |
3195 | break; | |
3196 | case '%': | |
3197 | /* looking for '%' in str */ | |
7b9186f5 | 3198 | if (*str++ != '%') |
1da177e4 LT |
3199 | return num; |
3200 | continue; | |
3201 | default: | |
3202 | /* invalid format; stop here */ | |
3203 | return num; | |
3204 | } | |
3205 | ||
3206 | /* have some sort of integer conversion. | |
3207 | * first, skip white space in buffer. | |
3208 | */ | |
e7d2860b | 3209 | str = skip_spaces(str); |
1da177e4 LT |
3210 | |
3211 | digit = *str; | |
3212 | if (is_sign && digit == '-') | |
3213 | digit = *(str + 1); | |
3214 | ||
3215 | if (!digit | |
7b9186f5 AGR |
3216 | || (base == 16 && !isxdigit(digit)) |
3217 | || (base == 10 && !isdigit(digit)) | |
3218 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
3219 | || (base == 0 && !isdigit(digit))) | |
3220 | break; | |
1da177e4 | 3221 | |
53809751 JB |
3222 | if (is_sign) |
3223 | val.s = qualifier != 'L' ? | |
3224 | simple_strtol(str, &next, base) : | |
3225 | simple_strtoll(str, &next, base); | |
3226 | else | |
3227 | val.u = qualifier != 'L' ? | |
3228 | simple_strtoul(str, &next, base) : | |
3229 | simple_strtoull(str, &next, base); | |
3230 | ||
3231 | if (field_width > 0 && next - str > field_width) { | |
3232 | if (base == 0) | |
3233 | _parse_integer_fixup_radix(str, &base); | |
3234 | while (next - str > field_width) { | |
3235 | if (is_sign) | |
3236 | val.s = div_s64(val.s, base); | |
3237 | else | |
3238 | val.u = div_u64(val.u, base); | |
3239 | --next; | |
3240 | } | |
3241 | } | |
3242 | ||
7b9186f5 | 3243 | switch (qualifier) { |
1da177e4 | 3244 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
3245 | if (is_sign) |
3246 | *va_arg(args, signed char *) = val.s; | |
3247 | else | |
3248 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
3249 | break; |
3250 | case 'h': | |
53809751 JB |
3251 | if (is_sign) |
3252 | *va_arg(args, short *) = val.s; | |
3253 | else | |
3254 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
3255 | break; |
3256 | case 'l': | |
53809751 JB |
3257 | if (is_sign) |
3258 | *va_arg(args, long *) = val.s; | |
3259 | else | |
3260 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
3261 | break; |
3262 | case 'L': | |
53809751 JB |
3263 | if (is_sign) |
3264 | *va_arg(args, long long *) = val.s; | |
3265 | else | |
3266 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 | 3267 | break; |
1da177e4 | 3268 | case 'z': |
53809751 JB |
3269 | *va_arg(args, size_t *) = val.u; |
3270 | break; | |
1da177e4 | 3271 | default: |
53809751 JB |
3272 | if (is_sign) |
3273 | *va_arg(args, int *) = val.s; | |
3274 | else | |
3275 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
3276 | break; |
3277 | } | |
3278 | num++; | |
3279 | ||
3280 | if (!next) | |
3281 | break; | |
3282 | str = next; | |
3283 | } | |
c6b40d16 | 3284 | |
1da177e4 LT |
3285 | return num; |
3286 | } | |
1da177e4 LT |
3287 | EXPORT_SYMBOL(vsscanf); |
3288 | ||
3289 | /** | |
3290 | * sscanf - Unformat a buffer into a list of arguments | |
3291 | * @buf: input buffer | |
3292 | * @fmt: formatting of buffer | |
3293 | * @...: resulting arguments | |
3294 | */ | |
7b9186f5 | 3295 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
3296 | { |
3297 | va_list args; | |
3298 | int i; | |
3299 | ||
7b9186f5 AGR |
3300 | va_start(args, fmt); |
3301 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 3302 | va_end(args); |
7b9186f5 | 3303 | |
1da177e4 LT |
3304 | return i; |
3305 | } | |
1da177e4 | 3306 | EXPORT_SYMBOL(sscanf); |