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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> | |
0d1d7a55 | 20 | #include <linux/clk.h> |
900cca29 | 21 | #include <linux/clk-provider.h> |
8bc3bcc9 | 22 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
23 | #include <linux/types.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/kernel.h> | |
0fe1ef24 | 27 | #include <linux/kallsyms.h> |
53809751 | 28 | #include <linux/math64.h> |
0fe1ef24 | 29 | #include <linux/uaccess.h> |
332d2e78 | 30 | #include <linux/ioport.h> |
4b6ccca7 | 31 | #include <linux/dcache.h> |
312b4e22 | 32 | #include <linux/cred.h> |
8a27f7c9 | 33 | #include <net/addrconf.h> |
1031bc58 DM |
34 | #ifdef CONFIG_BLOCK |
35 | #include <linux/blkdev.h> | |
36 | #endif | |
1da177e4 | 37 | |
edf14cdb VB |
38 | #include "../mm/internal.h" /* For the trace_print_flags arrays */ |
39 | ||
4e57b681 | 40 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 41 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
7c43d9a3 | 42 | #include <asm/byteorder.h> /* cpu_to_le16 */ |
1da177e4 | 43 | |
71dca95d | 44 | #include <linux/string_helpers.h> |
1dff46d6 | 45 | #include "kstrtox.h" |
aa46a63e | 46 | |
1da177e4 | 47 | /** |
922ac25c | 48 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
49 | * @cp: The start of the string |
50 | * @endp: A pointer to the end of the parsed string will be placed here | |
51 | * @base: The number base to use | |
462e4711 EZ |
52 | * |
53 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 54 | */ |
922ac25c | 55 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 56 | { |
1dff46d6 AD |
57 | unsigned long long result; |
58 | unsigned int rv; | |
aa46a63e | 59 | |
1dff46d6 AD |
60 | cp = _parse_integer_fixup_radix(cp, &base); |
61 | rv = _parse_integer(cp, base, &result); | |
62 | /* FIXME */ | |
63 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 64 | |
1da177e4 LT |
65 | if (endp) |
66 | *endp = (char *)cp; | |
7b9186f5 | 67 | |
1da177e4 LT |
68 | return result; |
69 | } | |
922ac25c | 70 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
71 | |
72 | /** | |
922ac25c | 73 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
74 | * @cp: The start of the string |
75 | * @endp: A pointer to the end of the parsed string will be placed here | |
76 | * @base: The number base to use | |
462e4711 EZ |
77 | * |
78 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 79 | */ |
922ac25c | 80 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 81 | { |
922ac25c | 82 | return simple_strtoull(cp, endp, base); |
1da177e4 | 83 | } |
922ac25c | 84 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
85 | |
86 | /** | |
922ac25c | 87 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
88 | * @cp: The start of the string |
89 | * @endp: A pointer to the end of the parsed string will be placed here | |
90 | * @base: The number base to use | |
462e4711 EZ |
91 | * |
92 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 93 | */ |
922ac25c | 94 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 95 | { |
922ac25c AGR |
96 | if (*cp == '-') |
97 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 98 | |
922ac25c | 99 | return simple_strtoul(cp, endp, base); |
1da177e4 | 100 | } |
922ac25c | 101 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
102 | |
103 | /** | |
104 | * simple_strtoll - convert a string to a signed long long | |
105 | * @cp: The start of the string | |
106 | * @endp: A pointer to the end of the parsed string will be placed here | |
107 | * @base: The number base to use | |
462e4711 EZ |
108 | * |
109 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 110 | */ |
22d27051 | 111 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 112 | { |
7b9186f5 | 113 | if (*cp == '-') |
22d27051 | 114 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 115 | |
22d27051 | 116 | return simple_strtoull(cp, endp, base); |
1da177e4 | 117 | } |
98d5ce0d | 118 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 119 | |
cf3b429b JP |
120 | static noinline_for_stack |
121 | int skip_atoi(const char **s) | |
1da177e4 | 122 | { |
7b9186f5 | 123 | int i = 0; |
1da177e4 | 124 | |
43e5b666 | 125 | do { |
1da177e4 | 126 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 127 | } while (isdigit(**s)); |
7b9186f5 | 128 | |
1da177e4 LT |
129 | return i; |
130 | } | |
131 | ||
7c43d9a3 RV |
132 | /* |
133 | * Decimal conversion is by far the most typical, and is used for | |
134 | * /proc and /sys data. This directly impacts e.g. top performance | |
135 | * with many processes running. We optimize it for speed by emitting | |
136 | * two characters at a time, using a 200 byte lookup table. This | |
137 | * roughly halves the number of multiplications compared to computing | |
138 | * the digits one at a time. Implementation strongly inspired by the | |
139 | * previous version, which in turn used ideas described at | |
140 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
141 | * from the author, Douglas W. Jones). | |
142 | * | |
143 | * It turns out there is precisely one 26 bit fixed-point | |
144 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
145 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
146 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
147 | * irrelevant for our purpose. | |
148 | * | |
149 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
150 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
151 | * | |
152 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
153 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
154 | * for all x <= 43698. | |
133fd9f5 | 155 | */ |
4277eedd | 156 | |
7c43d9a3 RV |
157 | static const u16 decpair[100] = { |
158 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
159 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
160 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
161 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
162 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
163 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
164 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
165 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
166 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
167 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
168 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
169 | #undef _ | |
170 | }; | |
171 | ||
172 | /* | |
173 | * This will print a single '0' even if r == 0, since we would | |
675cf53c RV |
174 | * immediately jump to out_r where two 0s would be written but only |
175 | * one of them accounted for in buf. This is needed by ip4_string | |
176 | * below. All other callers pass a non-zero value of r. | |
7c43d9a3 | 177 | */ |
cf3b429b | 178 | static noinline_for_stack |
7c43d9a3 | 179 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 180 | { |
7c43d9a3 RV |
181 | unsigned q; |
182 | ||
183 | /* 1 <= r < 10^8 */ | |
184 | if (r < 100) | |
185 | goto out_r; | |
186 | ||
187 | /* 100 <= r < 10^8 */ | |
188 | q = (r * (u64)0x28f5c29) >> 32; | |
189 | *((u16 *)buf) = decpair[r - 100*q]; | |
190 | buf += 2; | |
191 | ||
192 | /* 1 <= q < 10^6 */ | |
193 | if (q < 100) | |
194 | goto out_q; | |
195 | ||
196 | /* 100 <= q < 10^6 */ | |
197 | r = (q * (u64)0x28f5c29) >> 32; | |
198 | *((u16 *)buf) = decpair[q - 100*r]; | |
199 | buf += 2; | |
200 | ||
201 | /* 1 <= r < 10^4 */ | |
202 | if (r < 100) | |
203 | goto out_r; | |
204 | ||
205 | /* 100 <= r < 10^4 */ | |
206 | q = (r * 0x147b) >> 19; | |
207 | *((u16 *)buf) = decpair[r - 100*q]; | |
208 | buf += 2; | |
209 | out_q: | |
210 | /* 1 <= q < 100 */ | |
211 | r = q; | |
212 | out_r: | |
213 | /* 1 <= r < 100 */ | |
214 | *((u16 *)buf) = decpair[r]; | |
675cf53c | 215 | buf += r < 10 ? 1 : 2; |
4277eedd DV |
216 | return buf; |
217 | } | |
133fd9f5 | 218 | |
7c43d9a3 | 219 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 |
cf3b429b | 220 | static noinline_for_stack |
7c43d9a3 | 221 | char *put_dec_full8(char *buf, unsigned r) |
4277eedd | 222 | { |
133fd9f5 DV |
223 | unsigned q; |
224 | ||
7c43d9a3 RV |
225 | /* 0 <= r < 10^8 */ |
226 | q = (r * (u64)0x28f5c29) >> 32; | |
227 | *((u16 *)buf) = decpair[r - 100*q]; | |
228 | buf += 2; | |
4277eedd | 229 | |
7c43d9a3 RV |
230 | /* 0 <= q < 10^6 */ |
231 | r = (q * (u64)0x28f5c29) >> 32; | |
232 | *((u16 *)buf) = decpair[q - 100*r]; | |
233 | buf += 2; | |
7b9186f5 | 234 | |
7c43d9a3 RV |
235 | /* 0 <= r < 10^4 */ |
236 | q = (r * 0x147b) >> 19; | |
237 | *((u16 *)buf) = decpair[r - 100*q]; | |
238 | buf += 2; | |
133fd9f5 | 239 | |
7c43d9a3 RV |
240 | /* 0 <= q < 100 */ |
241 | *((u16 *)buf) = decpair[q]; | |
242 | buf += 2; | |
243 | return buf; | |
244 | } | |
133fd9f5 | 245 | |
7c43d9a3 | 246 | static noinline_for_stack |
133fd9f5 DV |
247 | char *put_dec(char *buf, unsigned long long n) |
248 | { | |
7c43d9a3 RV |
249 | if (n >= 100*1000*1000) |
250 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
251 | /* 1 <= n <= 1.6e11 */ | |
252 | if (n >= 100*1000*1000) | |
253 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
254 | /* 1 <= n < 1e8 */ | |
133fd9f5 | 255 | return put_dec_trunc8(buf, n); |
4277eedd | 256 | } |
133fd9f5 | 257 | |
7c43d9a3 | 258 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 |
133fd9f5 | 259 | |
7c43d9a3 RV |
260 | static void |
261 | put_dec_full4(char *buf, unsigned r) | |
4277eedd | 262 | { |
7c43d9a3 RV |
263 | unsigned q; |
264 | ||
265 | /* 0 <= r < 10^4 */ | |
266 | q = (r * 0x147b) >> 19; | |
267 | *((u16 *)buf) = decpair[r - 100*q]; | |
268 | buf += 2; | |
269 | /* 0 <= q < 100 */ | |
270 | *((u16 *)buf) = decpair[q]; | |
2359172a GS |
271 | } |
272 | ||
273 | /* | |
274 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
275 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
276 | * holds for all x < 1,128,869,999. The largest value this | |
277 | * helper will ever be asked to convert is 1,125,520,955. | |
7c43d9a3 | 278 | * (second call in the put_dec code, assuming n is all-ones). |
2359172a | 279 | */ |
7c43d9a3 | 280 | static noinline_for_stack |
2359172a GS |
281 | unsigned put_dec_helper4(char *buf, unsigned x) |
282 | { | |
283 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
284 | ||
285 | put_dec_full4(buf, x - q * 10000); | |
286 | return q; | |
4277eedd DV |
287 | } |
288 | ||
133fd9f5 DV |
289 | /* Based on code by Douglas W. Jones found at |
290 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
291 | * (with permission from the author). | |
292 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
293 | */ | |
294 | static | |
295 | char *put_dec(char *buf, unsigned long long n) | |
296 | { | |
297 | uint32_t d3, d2, d1, q, h; | |
298 | ||
299 | if (n < 100*1000*1000) | |
300 | return put_dec_trunc8(buf, n); | |
301 | ||
302 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
303 | h = (n >> 32); | |
304 | d2 = (h ) & 0xffff; | |
305 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
306 | ||
7c43d9a3 RV |
307 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 |
308 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
133fd9f5 | 309 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
2359172a GS |
310 | q = put_dec_helper4(buf, q); |
311 | ||
312 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
313 | q = put_dec_helper4(buf+4, q); | |
314 | ||
315 | q += 4749 * d3 + 42 * d2; | |
316 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 317 | |
2359172a GS |
318 | q += 281 * d3; |
319 | buf += 12; | |
320 | if (q) | |
321 | buf = put_dec_trunc8(buf, q); | |
322 | else while (buf[-1] == '0') | |
133fd9f5 DV |
323 | --buf; |
324 | ||
325 | return buf; | |
326 | } | |
327 | ||
328 | #endif | |
329 | ||
1ac101a5 KH |
330 | /* |
331 | * Convert passed number to decimal string. | |
332 | * Returns the length of string. On buffer overflow, returns 0. | |
333 | * | |
334 | * If speed is not important, use snprintf(). It's easy to read the code. | |
335 | */ | |
336 | int num_to_str(char *buf, int size, unsigned long long num) | |
337 | { | |
7c43d9a3 RV |
338 | /* put_dec requires 2-byte alignment of the buffer. */ |
339 | char tmp[sizeof(num) * 3] __aligned(2); | |
1ac101a5 KH |
340 | int idx, len; |
341 | ||
133fd9f5 DV |
342 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
343 | if (num <= 9) { | |
344 | tmp[0] = '0' + num; | |
345 | len = 1; | |
346 | } else { | |
347 | len = put_dec(tmp, num) - tmp; | |
348 | } | |
1ac101a5 KH |
349 | |
350 | if (len > size) | |
351 | return 0; | |
352 | for (idx = 0; idx < len; ++idx) | |
353 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 354 | return len; |
1ac101a5 KH |
355 | } |
356 | ||
51be17df | 357 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 358 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
359 | #define PLUS 4 /* show plus */ |
360 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 361 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
362 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
363 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 364 | |
fef20d9c FW |
365 | enum format_type { |
366 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 367 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
368 | FORMAT_TYPE_PRECISION, |
369 | FORMAT_TYPE_CHAR, | |
370 | FORMAT_TYPE_STR, | |
371 | FORMAT_TYPE_PTR, | |
372 | FORMAT_TYPE_PERCENT_CHAR, | |
373 | FORMAT_TYPE_INVALID, | |
374 | FORMAT_TYPE_LONG_LONG, | |
375 | FORMAT_TYPE_ULONG, | |
376 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
377 | FORMAT_TYPE_UBYTE, |
378 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
379 | FORMAT_TYPE_USHORT, |
380 | FORMAT_TYPE_SHORT, | |
381 | FORMAT_TYPE_UINT, | |
382 | FORMAT_TYPE_INT, | |
fef20d9c FW |
383 | FORMAT_TYPE_SIZE_T, |
384 | FORMAT_TYPE_PTRDIFF | |
385 | }; | |
386 | ||
387 | struct printf_spec { | |
d0484193 RV |
388 | unsigned int type:8; /* format_type enum */ |
389 | signed int field_width:24; /* width of output field */ | |
390 | unsigned int flags:8; /* flags to number() */ | |
391 | unsigned int base:8; /* number base, 8, 10 or 16 only */ | |
392 | signed int precision:16; /* # of digits/chars */ | |
393 | } __packed; | |
4d72ba01 RV |
394 | #define FIELD_WIDTH_MAX ((1 << 23) - 1) |
395 | #define PRECISION_MAX ((1 << 15) - 1) | |
fef20d9c | 396 | |
cf3b429b JP |
397 | static noinline_for_stack |
398 | char *number(char *buf, char *end, unsigned long long num, | |
399 | struct printf_spec spec) | |
1da177e4 | 400 | { |
7c43d9a3 RV |
401 | /* put_dec requires 2-byte alignment of the buffer. */ |
402 | char tmp[3 * sizeof(num)] __aligned(2); | |
9b706aee DV |
403 | char sign; |
404 | char locase; | |
fef20d9c | 405 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 406 | int i; |
7c203422 | 407 | bool is_zero = num == 0LL; |
1c7a8e62 RV |
408 | int field_width = spec.field_width; |
409 | int precision = spec.precision; | |
1da177e4 | 410 | |
d0484193 RV |
411 | BUILD_BUG_ON(sizeof(struct printf_spec) != 8); |
412 | ||
9b706aee DV |
413 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
414 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
415 | locase = (spec.flags & SMALL); |
416 | if (spec.flags & LEFT) | |
417 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 418 | sign = 0; |
fef20d9c | 419 | if (spec.flags & SIGN) { |
7b9186f5 | 420 | if ((signed long long)num < 0) { |
1da177e4 | 421 | sign = '-'; |
7b9186f5 | 422 | num = -(signed long long)num; |
1c7a8e62 | 423 | field_width--; |
fef20d9c | 424 | } else if (spec.flags & PLUS) { |
1da177e4 | 425 | sign = '+'; |
1c7a8e62 | 426 | field_width--; |
fef20d9c | 427 | } else if (spec.flags & SPACE) { |
1da177e4 | 428 | sign = ' '; |
1c7a8e62 | 429 | field_width--; |
1da177e4 LT |
430 | } |
431 | } | |
b39a7340 | 432 | if (need_pfx) { |
fef20d9c | 433 | if (spec.base == 16) |
1c7a8e62 | 434 | field_width -= 2; |
7c203422 | 435 | else if (!is_zero) |
1c7a8e62 | 436 | field_width--; |
1da177e4 | 437 | } |
b39a7340 DV |
438 | |
439 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 440 | i = 0; |
133fd9f5 | 441 | if (num < spec.base) |
3ea8d440 | 442 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
443 | else if (spec.base != 10) { /* 8 or 16 */ |
444 | int mask = spec.base - 1; | |
b39a7340 | 445 | int shift = 3; |
7b9186f5 AGR |
446 | |
447 | if (spec.base == 16) | |
448 | shift = 4; | |
b39a7340 | 449 | do { |
3ea8d440 | 450 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
451 | num >>= shift; |
452 | } while (num); | |
4277eedd DV |
453 | } else { /* base 10 */ |
454 | i = put_dec(tmp, num) - tmp; | |
455 | } | |
b39a7340 DV |
456 | |
457 | /* printing 100 using %2d gives "100", not "00" */ | |
1c7a8e62 RV |
458 | if (i > precision) |
459 | precision = i; | |
b39a7340 | 460 | /* leading space padding */ |
1c7a8e62 | 461 | field_width -= precision; |
51be17df | 462 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
1c7a8e62 | 463 | while (--field_width >= 0) { |
f796937a | 464 | if (buf < end) |
1da177e4 LT |
465 | *buf = ' '; |
466 | ++buf; | |
467 | } | |
468 | } | |
b39a7340 | 469 | /* sign */ |
1da177e4 | 470 | if (sign) { |
f796937a | 471 | if (buf < end) |
1da177e4 LT |
472 | *buf = sign; |
473 | ++buf; | |
474 | } | |
b39a7340 DV |
475 | /* "0x" / "0" prefix */ |
476 | if (need_pfx) { | |
7c203422 PC |
477 | if (spec.base == 16 || !is_zero) { |
478 | if (buf < end) | |
479 | *buf = '0'; | |
480 | ++buf; | |
481 | } | |
fef20d9c | 482 | if (spec.base == 16) { |
f796937a | 483 | if (buf < end) |
9b706aee | 484 | *buf = ('X' | locase); |
1da177e4 LT |
485 | ++buf; |
486 | } | |
487 | } | |
b39a7340 | 488 | /* zero or space padding */ |
fef20d9c | 489 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
490 | char c = ' ' + (spec.flags & ZEROPAD); |
491 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
1c7a8e62 | 492 | while (--field_width >= 0) { |
f796937a | 493 | if (buf < end) |
1da177e4 LT |
494 | *buf = c; |
495 | ++buf; | |
496 | } | |
497 | } | |
b39a7340 | 498 | /* hmm even more zero padding? */ |
1c7a8e62 | 499 | while (i <= --precision) { |
f796937a | 500 | if (buf < end) |
1da177e4 LT |
501 | *buf = '0'; |
502 | ++buf; | |
503 | } | |
b39a7340 DV |
504 | /* actual digits of result */ |
505 | while (--i >= 0) { | |
f796937a | 506 | if (buf < end) |
1da177e4 LT |
507 | *buf = tmp[i]; |
508 | ++buf; | |
509 | } | |
b39a7340 | 510 | /* trailing space padding */ |
1c7a8e62 | 511 | while (--field_width >= 0) { |
f796937a | 512 | if (buf < end) |
1da177e4 LT |
513 | *buf = ' '; |
514 | ++buf; | |
515 | } | |
7b9186f5 | 516 | |
1da177e4 LT |
517 | return buf; |
518 | } | |
519 | ||
3cab1e71 AS |
520 | static noinline_for_stack |
521 | char *special_hex_number(char *buf, char *end, unsigned long long num, int size) | |
522 | { | |
523 | struct printf_spec spec; | |
524 | ||
525 | spec.type = FORMAT_TYPE_PTR; | |
526 | spec.field_width = 2 + 2 * size; /* 0x + hex */ | |
527 | spec.flags = SPECIAL | SMALL | ZEROPAD; | |
528 | spec.base = 16; | |
529 | spec.precision = -1; | |
530 | ||
531 | return number(buf, end, num, spec); | |
532 | } | |
533 | ||
cfccde04 | 534 | static void move_right(char *buf, char *end, unsigned len, unsigned spaces) |
4b6ccca7 AV |
535 | { |
536 | size_t size; | |
537 | if (buf >= end) /* nowhere to put anything */ | |
538 | return; | |
539 | size = end - buf; | |
540 | if (size <= spaces) { | |
541 | memset(buf, ' ', size); | |
542 | return; | |
543 | } | |
544 | if (len) { | |
545 | if (len > size - spaces) | |
546 | len = size - spaces; | |
547 | memmove(buf + spaces, buf, len); | |
548 | } | |
549 | memset(buf, ' ', spaces); | |
550 | } | |
551 | ||
cfccde04 RV |
552 | /* |
553 | * Handle field width padding for a string. | |
554 | * @buf: current buffer position | |
555 | * @n: length of string | |
556 | * @end: end of output buffer | |
557 | * @spec: for field width and flags | |
558 | * Returns: new buffer position after padding. | |
559 | */ | |
560 | static noinline_for_stack | |
561 | char *widen_string(char *buf, int n, char *end, struct printf_spec spec) | |
562 | { | |
563 | unsigned spaces; | |
564 | ||
565 | if (likely(n >= spec.field_width)) | |
566 | return buf; | |
567 | /* we want to pad the sucker */ | |
568 | spaces = spec.field_width - n; | |
569 | if (!(spec.flags & LEFT)) { | |
570 | move_right(buf - n, end, n, spaces); | |
571 | return buf + spaces; | |
572 | } | |
573 | while (spaces--) { | |
574 | if (buf < end) | |
575 | *buf = ' '; | |
576 | ++buf; | |
577 | } | |
578 | return buf; | |
579 | } | |
580 | ||
95508cfa RV |
581 | static noinline_for_stack |
582 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
583 | { | |
34fc8b90 RV |
584 | int len = 0; |
585 | size_t lim = spec.precision; | |
95508cfa RV |
586 | |
587 | if ((unsigned long)s < PAGE_SIZE) | |
588 | s = "(null)"; | |
589 | ||
34fc8b90 RV |
590 | while (lim--) { |
591 | char c = *s++; | |
592 | if (!c) | |
593 | break; | |
95508cfa | 594 | if (buf < end) |
34fc8b90 | 595 | *buf = c; |
95508cfa | 596 | ++buf; |
34fc8b90 | 597 | ++len; |
95508cfa | 598 | } |
34fc8b90 | 599 | return widen_string(buf, len, end, spec); |
95508cfa RV |
600 | } |
601 | ||
4b6ccca7 AV |
602 | static noinline_for_stack |
603 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
604 | const char *fmt) | |
605 | { | |
606 | const char *array[4], *s; | |
607 | const struct dentry *p; | |
608 | int depth; | |
609 | int i, n; | |
610 | ||
611 | switch (fmt[1]) { | |
612 | case '2': case '3': case '4': | |
613 | depth = fmt[1] - '0'; | |
614 | break; | |
615 | default: | |
616 | depth = 1; | |
617 | } | |
618 | ||
619 | rcu_read_lock(); | |
620 | for (i = 0; i < depth; i++, d = p) { | |
621 | p = ACCESS_ONCE(d->d_parent); | |
622 | array[i] = ACCESS_ONCE(d->d_name.name); | |
623 | if (p == d) { | |
624 | if (i) | |
625 | array[i] = ""; | |
626 | i++; | |
627 | break; | |
628 | } | |
629 | } | |
630 | s = array[--i]; | |
631 | for (n = 0; n != spec.precision; n++, buf++) { | |
632 | char c = *s++; | |
633 | if (!c) { | |
634 | if (!i) | |
635 | break; | |
636 | c = '/'; | |
637 | s = array[--i]; | |
638 | } | |
639 | if (buf < end) | |
640 | *buf = c; | |
641 | } | |
642 | rcu_read_unlock(); | |
cfccde04 | 643 | return widen_string(buf, n, end, spec); |
4b6ccca7 AV |
644 | } |
645 | ||
1031bc58 DM |
646 | #ifdef CONFIG_BLOCK |
647 | static noinline_for_stack | |
648 | char *bdev_name(char *buf, char *end, struct block_device *bdev, | |
649 | struct printf_spec spec, const char *fmt) | |
650 | { | |
651 | struct gendisk *hd = bdev->bd_disk; | |
652 | ||
653 | buf = string(buf, end, hd->disk_name, spec); | |
654 | if (bdev->bd_part->partno) { | |
655 | if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { | |
656 | if (buf < end) | |
657 | *buf = 'p'; | |
658 | buf++; | |
659 | } | |
660 | buf = number(buf, end, bdev->bd_part->partno, spec); | |
661 | } | |
662 | return buf; | |
663 | } | |
664 | #endif | |
665 | ||
cf3b429b JP |
666 | static noinline_for_stack |
667 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 668 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 669 | { |
b0d33c2b | 670 | unsigned long value; |
0fe1ef24 LT |
671 | #ifdef CONFIG_KALLSYMS |
672 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
673 | #endif |
674 | ||
675 | if (fmt[1] == 'R') | |
676 | ptr = __builtin_extract_return_addr(ptr); | |
677 | value = (unsigned long)ptr; | |
678 | ||
679 | #ifdef CONFIG_KALLSYMS | |
680 | if (*fmt == 'B') | |
0f77a8d3 | 681 | sprint_backtrace(sym, value); |
b0d33c2b | 682 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
683 | sprint_symbol(sym, value); |
684 | else | |
4796dd20 | 685 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 686 | |
fef20d9c | 687 | return string(buf, end, sym, spec); |
0fe1ef24 | 688 | #else |
3cab1e71 | 689 | return special_hex_number(buf, end, value, sizeof(void *)); |
0fe1ef24 LT |
690 | #endif |
691 | } | |
692 | ||
cf3b429b JP |
693 | static noinline_for_stack |
694 | char *resource_string(char *buf, char *end, struct resource *res, | |
695 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
696 | { |
697 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 698 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
699 | #endif |
700 | ||
701 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 702 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 703 | #endif |
4da0b66c | 704 | static const struct printf_spec io_spec = { |
fef20d9c | 705 | .base = 16, |
4da0b66c | 706 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
707 | .precision = -1, |
708 | .flags = SPECIAL | SMALL | ZEROPAD, | |
709 | }; | |
4da0b66c BH |
710 | static const struct printf_spec mem_spec = { |
711 | .base = 16, | |
712 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
713 | .precision = -1, | |
714 | .flags = SPECIAL | SMALL | ZEROPAD, | |
715 | }; | |
0f4050c7 BH |
716 | static const struct printf_spec bus_spec = { |
717 | .base = 16, | |
718 | .field_width = 2, | |
719 | .precision = -1, | |
720 | .flags = SMALL | ZEROPAD, | |
721 | }; | |
4da0b66c | 722 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
723 | .base = 10, |
724 | .precision = -1, | |
725 | .flags = 0, | |
726 | }; | |
4da0b66c | 727 | static const struct printf_spec str_spec = { |
fd95541e BH |
728 | .field_width = -1, |
729 | .precision = 10, | |
730 | .flags = LEFT, | |
731 | }; | |
4da0b66c | 732 | static const struct printf_spec flag_spec = { |
fd95541e BH |
733 | .base = 16, |
734 | .precision = -1, | |
735 | .flags = SPECIAL | SMALL, | |
736 | }; | |
c7dabef8 BH |
737 | |
738 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
739 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
740 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
741 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 742 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
743 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
744 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
745 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
746 | ||
332d2e78 | 747 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 748 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 749 | const struct printf_spec *specp; |
332d2e78 LT |
750 | |
751 | *p++ = '['; | |
4da0b66c | 752 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 753 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
754 | specp = &io_spec; |
755 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 756 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
757 | specp = &mem_spec; |
758 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 759 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
760 | specp = &dec_spec; |
761 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 762 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 763 | specp = &dec_spec; |
0f4050c7 BH |
764 | } else if (res->flags & IORESOURCE_BUS) { |
765 | p = string(p, pend, "bus ", str_spec); | |
766 | specp = &bus_spec; | |
4da0b66c | 767 | } else { |
c7dabef8 | 768 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 769 | specp = &mem_spec; |
c7dabef8 | 770 | decode = 0; |
fd95541e | 771 | } |
d19cb803 BH |
772 | if (decode && res->flags & IORESOURCE_UNSET) { |
773 | p = string(p, pend, "size ", str_spec); | |
774 | p = number(p, pend, resource_size(res), *specp); | |
775 | } else { | |
776 | p = number(p, pend, res->start, *specp); | |
777 | if (res->start != res->end) { | |
778 | *p++ = '-'; | |
779 | p = number(p, pend, res->end, *specp); | |
780 | } | |
c91d3376 | 781 | } |
c7dabef8 | 782 | if (decode) { |
fd95541e BH |
783 | if (res->flags & IORESOURCE_MEM_64) |
784 | p = string(p, pend, " 64bit", str_spec); | |
785 | if (res->flags & IORESOURCE_PREFETCH) | |
786 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
787 | if (res->flags & IORESOURCE_WINDOW) |
788 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
789 | if (res->flags & IORESOURCE_DISABLED) |
790 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
791 | } else { |
792 | p = string(p, pend, " flags ", str_spec); | |
793 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 794 | } |
332d2e78 | 795 | *p++ = ']'; |
c7dabef8 | 796 | *p = '\0'; |
332d2e78 | 797 | |
fef20d9c | 798 | return string(buf, end, sym, spec); |
332d2e78 LT |
799 | } |
800 | ||
31550a16 AS |
801 | static noinline_for_stack |
802 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
803 | const char *fmt) | |
804 | { | |
360603a1 | 805 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
806 | negative value, fallback to the default */ |
807 | char separator; | |
808 | ||
809 | if (spec.field_width == 0) | |
810 | /* nothing to print */ | |
811 | return buf; | |
812 | ||
813 | if (ZERO_OR_NULL_PTR(addr)) | |
814 | /* NULL pointer */ | |
815 | return string(buf, end, NULL, spec); | |
816 | ||
817 | switch (fmt[1]) { | |
818 | case 'C': | |
819 | separator = ':'; | |
820 | break; | |
821 | case 'D': | |
822 | separator = '-'; | |
823 | break; | |
824 | case 'N': | |
825 | separator = 0; | |
826 | break; | |
827 | default: | |
828 | separator = ' '; | |
829 | break; | |
830 | } | |
831 | ||
832 | if (spec.field_width > 0) | |
833 | len = min_t(int, spec.field_width, 64); | |
834 | ||
9c98f235 RV |
835 | for (i = 0; i < len; ++i) { |
836 | if (buf < end) | |
837 | *buf = hex_asc_hi(addr[i]); | |
838 | ++buf; | |
839 | if (buf < end) | |
840 | *buf = hex_asc_lo(addr[i]); | |
841 | ++buf; | |
31550a16 | 842 | |
9c98f235 RV |
843 | if (separator && i != len - 1) { |
844 | if (buf < end) | |
845 | *buf = separator; | |
846 | ++buf; | |
847 | } | |
31550a16 AS |
848 | } |
849 | ||
850 | return buf; | |
851 | } | |
852 | ||
dbc760bc TH |
853 | static noinline_for_stack |
854 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
855 | struct printf_spec spec, const char *fmt) | |
856 | { | |
857 | const int CHUNKSZ = 32; | |
858 | int nr_bits = max_t(int, spec.field_width, 0); | |
859 | int i, chunksz; | |
860 | bool first = true; | |
861 | ||
862 | /* reused to print numbers */ | |
863 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
864 | ||
865 | chunksz = nr_bits & (CHUNKSZ - 1); | |
866 | if (chunksz == 0) | |
867 | chunksz = CHUNKSZ; | |
868 | ||
869 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
870 | for (; i >= 0; i -= CHUNKSZ) { | |
871 | u32 chunkmask, val; | |
872 | int word, bit; | |
873 | ||
874 | chunkmask = ((1ULL << chunksz) - 1); | |
875 | word = i / BITS_PER_LONG; | |
876 | bit = i % BITS_PER_LONG; | |
877 | val = (bitmap[word] >> bit) & chunkmask; | |
878 | ||
879 | if (!first) { | |
880 | if (buf < end) | |
881 | *buf = ','; | |
882 | buf++; | |
883 | } | |
884 | first = false; | |
885 | ||
886 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
887 | buf = number(buf, end, val, spec); | |
888 | ||
889 | chunksz = CHUNKSZ; | |
890 | } | |
891 | return buf; | |
892 | } | |
893 | ||
894 | static noinline_for_stack | |
895 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
896 | struct printf_spec spec, const char *fmt) | |
897 | { | |
898 | int nr_bits = max_t(int, spec.field_width, 0); | |
899 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
900 | int cur, rbot, rtop; | |
901 | bool first = true; | |
902 | ||
903 | /* reused to print numbers */ | |
904 | spec = (struct printf_spec){ .base = 10 }; | |
905 | ||
906 | rbot = cur = find_first_bit(bitmap, nr_bits); | |
907 | while (cur < nr_bits) { | |
908 | rtop = cur; | |
909 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
910 | if (cur < nr_bits && cur <= rtop + 1) | |
911 | continue; | |
912 | ||
913 | if (!first) { | |
914 | if (buf < end) | |
915 | *buf = ','; | |
916 | buf++; | |
917 | } | |
918 | first = false; | |
919 | ||
920 | buf = number(buf, end, rbot, spec); | |
921 | if (rbot < rtop) { | |
922 | if (buf < end) | |
923 | *buf = '-'; | |
924 | buf++; | |
925 | ||
926 | buf = number(buf, end, rtop, spec); | |
927 | } | |
928 | ||
929 | rbot = cur; | |
930 | } | |
931 | return buf; | |
932 | } | |
933 | ||
cf3b429b JP |
934 | static noinline_for_stack |
935 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
936 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 937 | { |
8a27f7c9 | 938 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
939 | char *p = mac_addr; |
940 | int i; | |
bc7259a2 | 941 | char separator; |
76597ff9 | 942 | bool reversed = false; |
bc7259a2 | 943 | |
76597ff9 AE |
944 | switch (fmt[1]) { |
945 | case 'F': | |
bc7259a2 | 946 | separator = '-'; |
76597ff9 AE |
947 | break; |
948 | ||
949 | case 'R': | |
950 | reversed = true; | |
951 | /* fall through */ | |
952 | ||
953 | default: | |
bc7259a2 | 954 | separator = ':'; |
76597ff9 | 955 | break; |
bc7259a2 | 956 | } |
dd45c9cf HH |
957 | |
958 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
959 | if (reversed) |
960 | p = hex_byte_pack(p, addr[5 - i]); | |
961 | else | |
962 | p = hex_byte_pack(p, addr[i]); | |
963 | ||
8a27f7c9 | 964 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 965 | *p++ = separator; |
dd45c9cf HH |
966 | } |
967 | *p = '\0'; | |
968 | ||
fef20d9c | 969 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
970 | } |
971 | ||
cf3b429b JP |
972 | static noinline_for_stack |
973 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
974 | { |
975 | int i; | |
0159f24e JP |
976 | bool leading_zeros = (fmt[0] == 'i'); |
977 | int index; | |
978 | int step; | |
979 | ||
980 | switch (fmt[2]) { | |
981 | case 'h': | |
982 | #ifdef __BIG_ENDIAN | |
983 | index = 0; | |
984 | step = 1; | |
985 | #else | |
986 | index = 3; | |
987 | step = -1; | |
988 | #endif | |
989 | break; | |
990 | case 'l': | |
991 | index = 3; | |
992 | step = -1; | |
993 | break; | |
994 | case 'n': | |
995 | case 'b': | |
996 | default: | |
997 | index = 0; | |
998 | step = 1; | |
999 | break; | |
1000 | } | |
8a27f7c9 | 1001 | for (i = 0; i < 4; i++) { |
7c43d9a3 | 1002 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ |
133fd9f5 | 1003 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
1004 | if (leading_zeros) { |
1005 | if (digits < 3) | |
1006 | *p++ = '0'; | |
1007 | if (digits < 2) | |
1008 | *p++ = '0'; | |
1009 | } | |
1010 | /* reverse the digits in the quad */ | |
1011 | while (digits--) | |
1012 | *p++ = temp[digits]; | |
1013 | if (i < 3) | |
1014 | *p++ = '.'; | |
0159f24e | 1015 | index += step; |
8a27f7c9 | 1016 | } |
8a27f7c9 | 1017 | *p = '\0'; |
7b9186f5 | 1018 | |
8a27f7c9 JP |
1019 | return p; |
1020 | } | |
1021 | ||
cf3b429b JP |
1022 | static noinline_for_stack |
1023 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 1024 | { |
7b9186f5 | 1025 | int i, j, range; |
8a27f7c9 JP |
1026 | unsigned char zerolength[8]; |
1027 | int longest = 1; | |
1028 | int colonpos = -1; | |
1029 | u16 word; | |
7b9186f5 | 1030 | u8 hi, lo; |
8a27f7c9 | 1031 | bool needcolon = false; |
eb78cd26 JP |
1032 | bool useIPv4; |
1033 | struct in6_addr in6; | |
1034 | ||
1035 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
1036 | ||
1037 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
1038 | |
1039 | memset(zerolength, 0, sizeof(zerolength)); | |
1040 | ||
1041 | if (useIPv4) | |
1042 | range = 6; | |
1043 | else | |
1044 | range = 8; | |
1045 | ||
1046 | /* find position of longest 0 run */ | |
1047 | for (i = 0; i < range; i++) { | |
1048 | for (j = i; j < range; j++) { | |
eb78cd26 | 1049 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
1050 | break; |
1051 | zerolength[i]++; | |
1052 | } | |
1053 | } | |
1054 | for (i = 0; i < range; i++) { | |
1055 | if (zerolength[i] > longest) { | |
1056 | longest = zerolength[i]; | |
1057 | colonpos = i; | |
1058 | } | |
1059 | } | |
29cf519e JP |
1060 | if (longest == 1) /* don't compress a single 0 */ |
1061 | colonpos = -1; | |
689afa7d | 1062 | |
8a27f7c9 JP |
1063 | /* emit address */ |
1064 | for (i = 0; i < range; i++) { | |
1065 | if (i == colonpos) { | |
1066 | if (needcolon || i == 0) | |
1067 | *p++ = ':'; | |
1068 | *p++ = ':'; | |
1069 | needcolon = false; | |
1070 | i += longest - 1; | |
1071 | continue; | |
1072 | } | |
1073 | if (needcolon) { | |
1074 | *p++ = ':'; | |
1075 | needcolon = false; | |
1076 | } | |
1077 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1078 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1079 | hi = word >> 8; |
1080 | lo = word & 0xff; | |
1081 | if (hi) { | |
1082 | if (hi > 0x0f) | |
55036ba7 | 1083 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1084 | else |
1085 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1086 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1087 | } |
b5ff992b | 1088 | else if (lo > 0x0f) |
55036ba7 | 1089 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1090 | else |
1091 | *p++ = hex_asc_lo(lo); | |
1092 | needcolon = true; | |
1093 | } | |
1094 | ||
1095 | if (useIPv4) { | |
1096 | if (needcolon) | |
1097 | *p++ = ':'; | |
0159f24e | 1098 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1099 | } |
8a27f7c9 | 1100 | *p = '\0'; |
7b9186f5 | 1101 | |
8a27f7c9 JP |
1102 | return p; |
1103 | } | |
1104 | ||
cf3b429b JP |
1105 | static noinline_for_stack |
1106 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1107 | { |
1108 | int i; | |
7b9186f5 | 1109 | |
689afa7d | 1110 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1111 | p = hex_byte_pack(p, *addr++); |
1112 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1113 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1114 | *p++ = ':'; |
1115 | } | |
1116 | *p = '\0'; | |
7b9186f5 | 1117 | |
8a27f7c9 JP |
1118 | return p; |
1119 | } | |
1120 | ||
cf3b429b JP |
1121 | static noinline_for_stack |
1122 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1123 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1124 | { |
1125 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1126 | ||
1127 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1128 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1129 | else |
eb78cd26 | 1130 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1131 | |
fef20d9c | 1132 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
1133 | } |
1134 | ||
cf3b429b JP |
1135 | static noinline_for_stack |
1136 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1137 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1138 | { |
8a27f7c9 | 1139 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1140 | |
0159f24e | 1141 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1142 | |
fef20d9c | 1143 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
1144 | } |
1145 | ||
10679643 DB |
1146 | static noinline_for_stack |
1147 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1148 | struct printf_spec spec, const char *fmt) | |
1149 | { | |
1150 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1151 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1152 | sizeof(":12345") + sizeof("/123456789") + | |
1153 | sizeof("%1234567890")]; | |
1154 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1155 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1156 | char fmt6[2] = { fmt[0], '6' }; | |
1157 | u8 off = 0; | |
1158 | ||
1159 | fmt++; | |
1160 | while (isalpha(*++fmt)) { | |
1161 | switch (*fmt) { | |
1162 | case 'p': | |
1163 | have_p = true; | |
1164 | break; | |
1165 | case 'f': | |
1166 | have_f = true; | |
1167 | break; | |
1168 | case 's': | |
1169 | have_s = true; | |
1170 | break; | |
1171 | case 'c': | |
1172 | have_c = true; | |
1173 | break; | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | if (have_p || have_s || have_f) { | |
1178 | *p = '['; | |
1179 | off = 1; | |
1180 | } | |
1181 | ||
1182 | if (fmt6[0] == 'I' && have_c) | |
1183 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1184 | else | |
1185 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1186 | ||
1187 | if (have_p || have_s || have_f) | |
1188 | *p++ = ']'; | |
1189 | ||
1190 | if (have_p) { | |
1191 | *p++ = ':'; | |
1192 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1193 | } | |
1194 | if (have_f) { | |
1195 | *p++ = '/'; | |
1196 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1197 | IPV6_FLOWINFO_MASK), spec); | |
1198 | } | |
1199 | if (have_s) { | |
1200 | *p++ = '%'; | |
1201 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1202 | } | |
1203 | *p = '\0'; | |
1204 | ||
1205 | return string(buf, end, ip6_addr, spec); | |
1206 | } | |
1207 | ||
1208 | static noinline_for_stack | |
1209 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1210 | struct printf_spec spec, const char *fmt) | |
1211 | { | |
1212 | bool have_p = false; | |
1213 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1214 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1215 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1216 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1217 | ||
1218 | fmt++; | |
1219 | while (isalpha(*++fmt)) { | |
1220 | switch (*fmt) { | |
1221 | case 'p': | |
1222 | have_p = true; | |
1223 | break; | |
1224 | case 'h': | |
1225 | case 'l': | |
1226 | case 'n': | |
1227 | case 'b': | |
1228 | fmt4[2] = *fmt; | |
1229 | break; | |
1230 | } | |
1231 | } | |
1232 | ||
1233 | p = ip4_string(ip4_addr, addr, fmt4); | |
1234 | if (have_p) { | |
1235 | *p++ = ':'; | |
1236 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1237 | } | |
1238 | *p = '\0'; | |
1239 | ||
1240 | return string(buf, end, ip4_addr, spec); | |
1241 | } | |
1242 | ||
71dca95d AS |
1243 | static noinline_for_stack |
1244 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1245 | const char *fmt) | |
1246 | { | |
1247 | bool found = true; | |
1248 | int count = 1; | |
1249 | unsigned int flags = 0; | |
1250 | int len; | |
1251 | ||
1252 | if (spec.field_width == 0) | |
1253 | return buf; /* nothing to print */ | |
1254 | ||
1255 | if (ZERO_OR_NULL_PTR(addr)) | |
1256 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1257 | ||
1258 | ||
1259 | do { | |
1260 | switch (fmt[count++]) { | |
1261 | case 'a': | |
1262 | flags |= ESCAPE_ANY; | |
1263 | break; | |
1264 | case 'c': | |
1265 | flags |= ESCAPE_SPECIAL; | |
1266 | break; | |
1267 | case 'h': | |
1268 | flags |= ESCAPE_HEX; | |
1269 | break; | |
1270 | case 'n': | |
1271 | flags |= ESCAPE_NULL; | |
1272 | break; | |
1273 | case 'o': | |
1274 | flags |= ESCAPE_OCTAL; | |
1275 | break; | |
1276 | case 'p': | |
1277 | flags |= ESCAPE_NP; | |
1278 | break; | |
1279 | case 's': | |
1280 | flags |= ESCAPE_SPACE; | |
1281 | break; | |
1282 | default: | |
1283 | found = false; | |
1284 | break; | |
1285 | } | |
1286 | } while (found); | |
1287 | ||
1288 | if (!flags) | |
1289 | flags = ESCAPE_ANY_NP; | |
1290 | ||
1291 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1292 | ||
41416f23 RV |
1293 | /* |
1294 | * string_escape_mem() writes as many characters as it can to | |
1295 | * the given buffer, and returns the total size of the output | |
1296 | * had the buffer been big enough. | |
1297 | */ | |
1298 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
71dca95d AS |
1299 | |
1300 | return buf; | |
1301 | } | |
1302 | ||
cf3b429b JP |
1303 | static noinline_for_stack |
1304 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1305 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
1306 | { |
1307 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1308 | char *p = uuid; | |
1309 | int i; | |
1310 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1311 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1312 | const u8 *index = be; | |
1313 | bool uc = false; | |
1314 | ||
1315 | switch (*(++fmt)) { | |
1316 | case 'L': | |
1317 | uc = true; /* fall-through */ | |
1318 | case 'l': | |
1319 | index = le; | |
1320 | break; | |
1321 | case 'B': | |
1322 | uc = true; | |
1323 | break; | |
1324 | } | |
1325 | ||
1326 | for (i = 0; i < 16; i++) { | |
55036ba7 | 1327 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
1328 | switch (i) { |
1329 | case 3: | |
1330 | case 5: | |
1331 | case 7: | |
1332 | case 9: | |
1333 | *p++ = '-'; | |
1334 | break; | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | *p = 0; | |
1339 | ||
1340 | if (uc) { | |
1341 | p = uuid; | |
1342 | do { | |
1343 | *p = toupper(*p); | |
1344 | } while (*(++p)); | |
1345 | } | |
1346 | ||
1347 | return string(buf, end, uuid, spec); | |
1348 | } | |
1349 | ||
5b17aecf AS |
1350 | static noinline_for_stack |
1351 | char *netdev_bits(char *buf, char *end, const void *addr, const char *fmt) | |
c8f44aff | 1352 | { |
5b17aecf AS |
1353 | unsigned long long num; |
1354 | int size; | |
1355 | ||
1356 | switch (fmt[1]) { | |
1357 | case 'F': | |
1358 | num = *(const netdev_features_t *)addr; | |
1359 | size = sizeof(netdev_features_t); | |
1360 | break; | |
1361 | default: | |
1362 | num = (unsigned long)addr; | |
1363 | size = sizeof(unsigned long); | |
1364 | break; | |
1365 | } | |
c8f44aff | 1366 | |
3cab1e71 | 1367 | return special_hex_number(buf, end, num, size); |
c8f44aff MM |
1368 | } |
1369 | ||
aaf07621 | 1370 | static noinline_for_stack |
3cab1e71 | 1371 | char *address_val(char *buf, char *end, const void *addr, const char *fmt) |
aaf07621 JP |
1372 | { |
1373 | unsigned long long num; | |
3cab1e71 | 1374 | int size; |
aaf07621 JP |
1375 | |
1376 | switch (fmt[1]) { | |
1377 | case 'd': | |
1378 | num = *(const dma_addr_t *)addr; | |
3cab1e71 | 1379 | size = sizeof(dma_addr_t); |
aaf07621 JP |
1380 | break; |
1381 | case 'p': | |
1382 | default: | |
1383 | num = *(const phys_addr_t *)addr; | |
3cab1e71 | 1384 | size = sizeof(phys_addr_t); |
aaf07621 JP |
1385 | break; |
1386 | } | |
1387 | ||
3cab1e71 | 1388 | return special_hex_number(buf, end, num, size); |
aaf07621 JP |
1389 | } |
1390 | ||
900cca29 GU |
1391 | static noinline_for_stack |
1392 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1393 | const char *fmt) | |
1394 | { | |
1395 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk) | |
1396 | return string(buf, end, NULL, spec); | |
1397 | ||
1398 | switch (fmt[1]) { | |
1399 | case 'r': | |
1400 | return number(buf, end, clk_get_rate(clk), spec); | |
1401 | ||
1402 | case 'n': | |
1403 | default: | |
1404 | #ifdef CONFIG_COMMON_CLK | |
1405 | return string(buf, end, __clk_get_name(clk), spec); | |
1406 | #else | |
3cab1e71 | 1407 | return special_hex_number(buf, end, (unsigned long)clk, sizeof(unsigned long)); |
900cca29 GU |
1408 | #endif |
1409 | } | |
1410 | } | |
1411 | ||
edf14cdb VB |
1412 | static |
1413 | char *format_flags(char *buf, char *end, unsigned long flags, | |
1414 | const struct trace_print_flags *names) | |
1415 | { | |
1416 | unsigned long mask; | |
1417 | const struct printf_spec strspec = { | |
1418 | .field_width = -1, | |
1419 | .precision = -1, | |
1420 | }; | |
1421 | const struct printf_spec numspec = { | |
1422 | .flags = SPECIAL|SMALL, | |
1423 | .field_width = -1, | |
1424 | .precision = -1, | |
1425 | .base = 16, | |
1426 | }; | |
1427 | ||
1428 | for ( ; flags && names->name; names++) { | |
1429 | mask = names->mask; | |
1430 | if ((flags & mask) != mask) | |
1431 | continue; | |
1432 | ||
1433 | buf = string(buf, end, names->name, strspec); | |
1434 | ||
1435 | flags &= ~mask; | |
1436 | if (flags) { | |
1437 | if (buf < end) | |
1438 | *buf = '|'; | |
1439 | buf++; | |
1440 | } | |
1441 | } | |
1442 | ||
1443 | if (flags) | |
1444 | buf = number(buf, end, flags, numspec); | |
1445 | ||
1446 | return buf; | |
1447 | } | |
1448 | ||
1449 | static noinline_for_stack | |
1450 | char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt) | |
1451 | { | |
1452 | unsigned long flags; | |
1453 | const struct trace_print_flags *names; | |
1454 | ||
1455 | switch (fmt[1]) { | |
1456 | case 'p': | |
1457 | flags = *(unsigned long *)flags_ptr; | |
1458 | /* Remove zone id */ | |
1459 | flags &= (1UL << NR_PAGEFLAGS) - 1; | |
1460 | names = pageflag_names; | |
1461 | break; | |
1462 | case 'v': | |
1463 | flags = *(unsigned long *)flags_ptr; | |
1464 | names = vmaflag_names; | |
1465 | break; | |
1466 | case 'g': | |
1467 | flags = *(gfp_t *)flags_ptr; | |
1468 | names = gfpflag_names; | |
1469 | break; | |
1470 | default: | |
1471 | WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]); | |
1472 | return buf; | |
1473 | } | |
1474 | ||
1475 | return format_flags(buf, end, flags, names); | |
1476 | } | |
1477 | ||
411f05f1 | 1478 | int kptr_restrict __read_mostly; |
455cd5ab | 1479 | |
4d8a743c LT |
1480 | /* |
1481 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1482 | * by an extra set of alphanumeric characters that are extended format | |
1483 | * specifiers. | |
1484 | * | |
332d2e78 LT |
1485 | * Right now we handle: |
1486 | * | |
0c8b946e FW |
1487 | * - 'F' For symbolic function descriptor pointers with offset |
1488 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
1489 | * - 'S' For symbolic direct pointers with offset |
1490 | * - 's' For symbolic direct pointers without offset | |
b0d33c2b | 1491 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1492 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1493 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1494 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
1495 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
1496 | * width which must be explicitly specified either as part of the | |
1497 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1498 | * range-list format instead of hex format | |
dd45c9cf HH |
1499 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1500 | * usual colon-separated hex notation | |
8a27f7c9 | 1501 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1502 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1503 | * with a dash-separated hex notation |
7c59154e | 1504 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1505 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1506 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1507 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1508 | * [S][pfs] |
1509 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1510 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1511 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1512 | * IPv6 omits the colons (01020304...0f) | |
1513 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1514 | * [S][pfs] |
1515 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1516 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1517 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1518 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1519 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
1520 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
1521 | * of the following flags (see string_escape_mem() for the | |
1522 | * details): | |
1523 | * a - ESCAPE_ANY | |
1524 | * c - ESCAPE_SPECIAL | |
1525 | * h - ESCAPE_HEX | |
1526 | * n - ESCAPE_NULL | |
1527 | * o - ESCAPE_OCTAL | |
1528 | * p - ESCAPE_NP | |
1529 | * s - ESCAPE_SPACE | |
1530 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
1531 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1532 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1533 | * Options for %pU are: | |
1534 | * b big endian lower case hex (default) | |
1535 | * B big endian UPPER case hex | |
1536 | * l little endian lower case hex | |
1537 | * L little endian UPPER case hex | |
1538 | * big endian output byte order is: | |
1539 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1540 | * little endian output byte order is: | |
1541 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1542 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1543 | * call vsnprintf(->format, *->va_list). | |
1544 | * Implements a "recursive vsnprintf". | |
1545 | * Do not use this feature without some mechanism to verify the | |
1546 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1547 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1548 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1549 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1550 | * a certain separator (' ' by default): | |
1551 | * C colon | |
1552 | * D dash | |
1553 | * N no separator | |
1554 | * The maximum supported length is 64 bytes of the input. Consider | |
1555 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
1556 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1557 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
1558 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1559 | * - 'D[234]' Same as 'd' but for a struct file | |
1031bc58 | 1560 | * - 'g' For block_device name (gendisk + partition number) |
900cca29 GU |
1561 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
1562 | * (legacy clock framework) of the clock | |
1563 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
1564 | * (legacy clock framework) of the clock | |
1565 | * - 'Cr' For a clock, it prints the current rate of the clock | |
edf14cdb VB |
1566 | * - 'G' For flags to be printed as a collection of symbolic strings that would |
1567 | * construct the specific value. Supported flags given by option: | |
1568 | * p page flags (see struct page) given as pointer to unsigned long | |
1569 | * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t | |
1570 | * v vma flags (VM_*) given as pointer to unsigned long | |
5e4ee7b1 MK |
1571 | * |
1572 | * ** Please update also Documentation/printk-formats.txt when making changes ** | |
9ac6e44e | 1573 | * |
332d2e78 LT |
1574 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1575 | * function pointers are really function descriptors, which contain a | |
1576 | * pointer to the real address. | |
4d8a743c | 1577 | */ |
cf3b429b JP |
1578 | static noinline_for_stack |
1579 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1580 | struct printf_spec spec) | |
78a8bf69 | 1581 | { |
80c9eb46 | 1582 | const int default_width = 2 * sizeof(void *); |
725fe002 | 1583 | |
9f36e2c4 | 1584 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1585 | /* |
1586 | * Print (null) with the same width as a pointer so it makes | |
1587 | * tabular output look nice. | |
1588 | */ | |
1589 | if (spec.field_width == -1) | |
725fe002 | 1590 | spec.field_width = default_width; |
fef20d9c | 1591 | return string(buf, end, "(null)", spec); |
5e057981 | 1592 | } |
d97106ab | 1593 | |
0fe1ef24 LT |
1594 | switch (*fmt) { |
1595 | case 'F': | |
0c8b946e | 1596 | case 'f': |
0fe1ef24 LT |
1597 | ptr = dereference_function_descriptor(ptr); |
1598 | /* Fallthrough */ | |
1599 | case 'S': | |
9ac6e44e | 1600 | case 's': |
0f77a8d3 | 1601 | case 'B': |
b0d33c2b | 1602 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1603 | case 'R': |
c7dabef8 | 1604 | case 'r': |
fd95541e | 1605 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1606 | case 'h': |
1607 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
1608 | case 'b': |
1609 | switch (fmt[1]) { | |
1610 | case 'l': | |
1611 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1612 | default: | |
1613 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1614 | } | |
8a27f7c9 JP |
1615 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1616 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1617 | /* [mM]F (FDDI) */ |
1618 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1619 | return mac_address_string(buf, end, ptr, spec, fmt); |
1620 | case 'I': /* Formatted IP supported | |
1621 | * 4: 1.2.3.4 | |
1622 | * 6: 0001:0203:...:0708 | |
1623 | * 6c: 1::708 or 1::1.2.3.4 | |
1624 | */ | |
1625 | case 'i': /* Contiguous: | |
1626 | * 4: 001.002.003.004 | |
1627 | * 6: 000102...0f | |
1628 | */ | |
1629 | switch (fmt[1]) { | |
1630 | case '6': | |
1631 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1632 | case '4': | |
1633 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
1634 | case 'S': { |
1635 | const union { | |
1636 | struct sockaddr raw; | |
1637 | struct sockaddr_in v4; | |
1638 | struct sockaddr_in6 v6; | |
1639 | } *sa = ptr; | |
1640 | ||
1641 | switch (sa->raw.sa_family) { | |
1642 | case AF_INET: | |
1643 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1644 | case AF_INET6: | |
1645 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1646 | default: | |
1647 | return string(buf, end, "(invalid address)", spec); | |
1648 | }} | |
8a27f7c9 | 1649 | } |
fef20d9c | 1650 | break; |
71dca95d AS |
1651 | case 'E': |
1652 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
1653 | case 'U': |
1654 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1655 | case 'V': |
5756b76e JB |
1656 | { |
1657 | va_list va; | |
1658 | ||
1659 | va_copy(va, *((struct va_format *)ptr)->va); | |
1660 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1661 | ((struct va_format *)ptr)->fmt, va); | |
1662 | va_end(va); | |
1663 | return buf; | |
1664 | } | |
455cd5ab | 1665 | case 'K': |
312b4e22 RM |
1666 | switch (kptr_restrict) { |
1667 | case 0: | |
1668 | /* Always print %pK values */ | |
1669 | break; | |
1670 | case 1: { | |
7eb39129 JD |
1671 | const struct cred *cred; |
1672 | ||
1673 | /* | |
1674 | * kptr_restrict==1 cannot be used in IRQ context | |
1675 | * because its test for CAP_SYSLOG would be meaningless. | |
1676 | */ | |
1677 | if (in_irq() || in_serving_softirq() || in_nmi()) { | |
1678 | if (spec.field_width == -1) | |
1679 | spec.field_width = default_width; | |
1680 | return string(buf, end, "pK-error", spec); | |
1681 | } | |
1682 | ||
312b4e22 RM |
1683 | /* |
1684 | * Only print the real pointer value if the current | |
1685 | * process has CAP_SYSLOG and is running with the | |
1686 | * same credentials it started with. This is because | |
1687 | * access to files is checked at open() time, but %pK | |
1688 | * checks permission at read() time. We don't want to | |
1689 | * leak pointer values if a binary opens a file using | |
1690 | * %pK and then elevates privileges before reading it. | |
1691 | */ | |
7eb39129 | 1692 | cred = current_cred(); |
312b4e22 RM |
1693 | if (!has_capability_noaudit(current, CAP_SYSLOG) || |
1694 | !uid_eq(cred->euid, cred->uid) || | |
1695 | !gid_eq(cred->egid, cred->gid)) | |
1696 | ptr = NULL; | |
1697 | break; | |
1698 | } | |
1699 | case 2: | |
1700 | default: | |
1701 | /* Always print 0's for %pK */ | |
26297607 | 1702 | ptr = NULL; |
312b4e22 RM |
1703 | break; |
1704 | } | |
26297607 | 1705 | break; |
312b4e22 | 1706 | |
c8f44aff | 1707 | case 'N': |
5b17aecf | 1708 | return netdev_bits(buf, end, ptr, fmt); |
7d799210 | 1709 | case 'a': |
3cab1e71 | 1710 | return address_val(buf, end, ptr, fmt); |
4b6ccca7 AV |
1711 | case 'd': |
1712 | return dentry_name(buf, end, ptr, spec, fmt); | |
900cca29 GU |
1713 | case 'C': |
1714 | return clock(buf, end, ptr, spec, fmt); | |
4b6ccca7 AV |
1715 | case 'D': |
1716 | return dentry_name(buf, end, | |
1717 | ((const struct file *)ptr)->f_path.dentry, | |
1718 | spec, fmt); | |
1031bc58 DM |
1719 | #ifdef CONFIG_BLOCK |
1720 | case 'g': | |
1721 | return bdev_name(buf, end, ptr, spec, fmt); | |
1722 | #endif | |
1723 | ||
edf14cdb VB |
1724 | case 'G': |
1725 | return flags_string(buf, end, ptr, fmt); | |
fef20d9c FW |
1726 | } |
1727 | spec.flags |= SMALL; | |
1728 | if (spec.field_width == -1) { | |
725fe002 | 1729 | spec.field_width = default_width; |
fef20d9c FW |
1730 | spec.flags |= ZEROPAD; |
1731 | } | |
1732 | spec.base = 16; | |
1733 | ||
1734 | return number(buf, end, (unsigned long) ptr, spec); | |
1735 | } | |
1736 | ||
1737 | /* | |
1738 | * Helper function to decode printf style format. | |
1739 | * Each call decode a token from the format and return the | |
1740 | * number of characters read (or likely the delta where it wants | |
1741 | * to go on the next call). | |
1742 | * The decoded token is returned through the parameters | |
1743 | * | |
1744 | * 'h', 'l', or 'L' for integer fields | |
1745 | * 'z' support added 23/7/1999 S.H. | |
1746 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1747 | * 't' added for ptrdiff_t | |
1748 | * | |
1749 | * @fmt: the format string | |
1750 | * @type of the token returned | |
1751 | * @flags: various flags such as +, -, # tokens.. | |
1752 | * @field_width: overwritten width | |
1753 | * @base: base of the number (octal, hex, ...) | |
1754 | * @precision: precision of a number | |
1755 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1756 | */ | |
cf3b429b JP |
1757 | static noinline_for_stack |
1758 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1759 | { |
1760 | const char *start = fmt; | |
d0484193 | 1761 | char qualifier; |
fef20d9c FW |
1762 | |
1763 | /* we finished early by reading the field width */ | |
ed681a91 | 1764 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1765 | if (spec->field_width < 0) { |
1766 | spec->field_width = -spec->field_width; | |
1767 | spec->flags |= LEFT; | |
1768 | } | |
1769 | spec->type = FORMAT_TYPE_NONE; | |
1770 | goto precision; | |
1771 | } | |
1772 | ||
1773 | /* we finished early by reading the precision */ | |
1774 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1775 | if (spec->precision < 0) | |
1776 | spec->precision = 0; | |
1777 | ||
1778 | spec->type = FORMAT_TYPE_NONE; | |
1779 | goto qualifier; | |
1780 | } | |
1781 | ||
1782 | /* By default */ | |
1783 | spec->type = FORMAT_TYPE_NONE; | |
1784 | ||
1785 | for (; *fmt ; ++fmt) { | |
1786 | if (*fmt == '%') | |
1787 | break; | |
1788 | } | |
1789 | ||
1790 | /* Return the current non-format string */ | |
1791 | if (fmt != start || !*fmt) | |
1792 | return fmt - start; | |
1793 | ||
1794 | /* Process flags */ | |
1795 | spec->flags = 0; | |
1796 | ||
1797 | while (1) { /* this also skips first '%' */ | |
1798 | bool found = true; | |
1799 | ||
1800 | ++fmt; | |
1801 | ||
1802 | switch (*fmt) { | |
1803 | case '-': spec->flags |= LEFT; break; | |
1804 | case '+': spec->flags |= PLUS; break; | |
1805 | case ' ': spec->flags |= SPACE; break; | |
1806 | case '#': spec->flags |= SPECIAL; break; | |
1807 | case '0': spec->flags |= ZEROPAD; break; | |
1808 | default: found = false; | |
1809 | } | |
1810 | ||
1811 | if (!found) | |
1812 | break; | |
1813 | } | |
1814 | ||
1815 | /* get field width */ | |
1816 | spec->field_width = -1; | |
1817 | ||
1818 | if (isdigit(*fmt)) | |
1819 | spec->field_width = skip_atoi(&fmt); | |
1820 | else if (*fmt == '*') { | |
1821 | /* it's the next argument */ | |
ed681a91 | 1822 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1823 | return ++fmt - start; |
1824 | } | |
1825 | ||
1826 | precision: | |
1827 | /* get the precision */ | |
1828 | spec->precision = -1; | |
1829 | if (*fmt == '.') { | |
1830 | ++fmt; | |
1831 | if (isdigit(*fmt)) { | |
1832 | spec->precision = skip_atoi(&fmt); | |
1833 | if (spec->precision < 0) | |
1834 | spec->precision = 0; | |
1835 | } else if (*fmt == '*') { | |
1836 | /* it's the next argument */ | |
adf26f84 | 1837 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1838 | return ++fmt - start; |
1839 | } | |
1840 | } | |
1841 | ||
1842 | qualifier: | |
1843 | /* get the conversion qualifier */ | |
d0484193 | 1844 | qualifier = 0; |
75fb8f26 AS |
1845 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1846 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
d0484193 RV |
1847 | qualifier = *fmt++; |
1848 | if (unlikely(qualifier == *fmt)) { | |
1849 | if (qualifier == 'l') { | |
1850 | qualifier = 'L'; | |
a4e94ef0 | 1851 | ++fmt; |
d0484193 RV |
1852 | } else if (qualifier == 'h') { |
1853 | qualifier = 'H'; | |
a4e94ef0 Z |
1854 | ++fmt; |
1855 | } | |
fef20d9c FW |
1856 | } |
1857 | } | |
1858 | ||
1859 | /* default base */ | |
1860 | spec->base = 10; | |
1861 | switch (*fmt) { | |
1862 | case 'c': | |
1863 | spec->type = FORMAT_TYPE_CHAR; | |
1864 | return ++fmt - start; | |
1865 | ||
1866 | case 's': | |
1867 | spec->type = FORMAT_TYPE_STR; | |
1868 | return ++fmt - start; | |
1869 | ||
1870 | case 'p': | |
1871 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 1872 | return ++fmt - start; |
fef20d9c | 1873 | |
fef20d9c FW |
1874 | case '%': |
1875 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1876 | return ++fmt - start; | |
1877 | ||
1878 | /* integer number formats - set up the flags and "break" */ | |
1879 | case 'o': | |
1880 | spec->base = 8; | |
1881 | break; | |
1882 | ||
1883 | case 'x': | |
1884 | spec->flags |= SMALL; | |
1885 | ||
1886 | case 'X': | |
1887 | spec->base = 16; | |
1888 | break; | |
1889 | ||
1890 | case 'd': | |
1891 | case 'i': | |
39e874f8 | 1892 | spec->flags |= SIGN; |
fef20d9c | 1893 | case 'u': |
4aa99606 | 1894 | break; |
fef20d9c | 1895 | |
708d96fd RM |
1896 | case 'n': |
1897 | /* | |
b006f19b RV |
1898 | * Since %n poses a greater security risk than |
1899 | * utility, treat it as any other invalid or | |
1900 | * unsupported format specifier. | |
708d96fd | 1901 | */ |
708d96fd RM |
1902 | /* Fall-through */ |
1903 | ||
fef20d9c | 1904 | default: |
b006f19b | 1905 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); |
fef20d9c FW |
1906 | spec->type = FORMAT_TYPE_INVALID; |
1907 | return fmt - start; | |
0fe1ef24 | 1908 | } |
fef20d9c | 1909 | |
d0484193 | 1910 | if (qualifier == 'L') |
fef20d9c | 1911 | spec->type = FORMAT_TYPE_LONG_LONG; |
d0484193 | 1912 | else if (qualifier == 'l') { |
51be17df RV |
1913 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
1914 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
d0484193 | 1915 | } else if (_tolower(qualifier) == 'z') { |
fef20d9c | 1916 | spec->type = FORMAT_TYPE_SIZE_T; |
d0484193 | 1917 | } else if (qualifier == 't') { |
fef20d9c | 1918 | spec->type = FORMAT_TYPE_PTRDIFF; |
d0484193 | 1919 | } else if (qualifier == 'H') { |
51be17df RV |
1920 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
1921 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
d0484193 | 1922 | } else if (qualifier == 'h') { |
51be17df RV |
1923 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
1924 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 1925 | } else { |
51be17df RV |
1926 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
1927 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 1928 | } |
fef20d9c FW |
1929 | |
1930 | return ++fmt - start; | |
78a8bf69 LT |
1931 | } |
1932 | ||
4d72ba01 RV |
1933 | static void |
1934 | set_field_width(struct printf_spec *spec, int width) | |
1935 | { | |
1936 | spec->field_width = width; | |
1937 | if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) { | |
1938 | spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX); | |
1939 | } | |
1940 | } | |
1941 | ||
1942 | static void | |
1943 | set_precision(struct printf_spec *spec, int prec) | |
1944 | { | |
1945 | spec->precision = prec; | |
1946 | if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) { | |
1947 | spec->precision = clamp(prec, 0, PRECISION_MAX); | |
1948 | } | |
1949 | } | |
1950 | ||
1da177e4 LT |
1951 | /** |
1952 | * vsnprintf - Format a string and place it in a buffer | |
1953 | * @buf: The buffer to place the result into | |
1954 | * @size: The size of the buffer, including the trailing null space | |
1955 | * @fmt: The format string to use | |
1956 | * @args: Arguments for the format string | |
1957 | * | |
d7ec9a05 RV |
1958 | * This function generally follows C99 vsnprintf, but has some |
1959 | * extensions and a few limitations: | |
1960 | * | |
1961 | * %n is unsupported | |
5e4ee7b1 MK |
1962 | * %p* is handled by pointer() |
1963 | * | |
1964 | * See pointer() or Documentation/printk-formats.txt for more | |
1965 | * extensive description. | |
20036fdc | 1966 | * |
5e4ee7b1 | 1967 | * ** Please update the documentation in both places when making changes ** |
80f548e0 | 1968 | * |
1da177e4 LT |
1969 | * The return value is the number of characters which would |
1970 | * be generated for the given input, excluding the trailing | |
1971 | * '\0', as per ISO C99. If you want to have the exact | |
1972 | * number of characters written into @buf as return value | |
72fd4a35 | 1973 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1974 | * return is greater than or equal to @size, the resulting |
1975 | * string is truncated. | |
1976 | * | |
ba1835eb | 1977 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1978 | */ |
1979 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1980 | { | |
1da177e4 | 1981 | unsigned long long num; |
d4be151b | 1982 | char *str, *end; |
fef20d9c | 1983 | struct printf_spec spec = {0}; |
1da177e4 | 1984 | |
f796937a JF |
1985 | /* Reject out-of-range values early. Large positive sizes are |
1986 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 1987 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 1988 | return 0; |
1da177e4 LT |
1989 | |
1990 | str = buf; | |
f796937a | 1991 | end = buf + size; |
1da177e4 | 1992 | |
f796937a JF |
1993 | /* Make sure end is always >= buf */ |
1994 | if (end < buf) { | |
1995 | end = ((void *)-1); | |
1996 | size = end - buf; | |
1da177e4 LT |
1997 | } |
1998 | ||
fef20d9c FW |
1999 | while (*fmt) { |
2000 | const char *old_fmt = fmt; | |
d4be151b | 2001 | int read = format_decode(fmt, &spec); |
1da177e4 | 2002 | |
fef20d9c | 2003 | fmt += read; |
1da177e4 | 2004 | |
fef20d9c FW |
2005 | switch (spec.type) { |
2006 | case FORMAT_TYPE_NONE: { | |
2007 | int copy = read; | |
2008 | if (str < end) { | |
2009 | if (copy > end - str) | |
2010 | copy = end - str; | |
2011 | memcpy(str, old_fmt, copy); | |
1da177e4 | 2012 | } |
fef20d9c FW |
2013 | str += read; |
2014 | break; | |
1da177e4 LT |
2015 | } |
2016 | ||
ed681a91 | 2017 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2018 | set_field_width(&spec, va_arg(args, int)); |
fef20d9c | 2019 | break; |
1da177e4 | 2020 | |
fef20d9c | 2021 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2022 | set_precision(&spec, va_arg(args, int)); |
fef20d9c | 2023 | break; |
1da177e4 | 2024 | |
d4be151b AGR |
2025 | case FORMAT_TYPE_CHAR: { |
2026 | char c; | |
2027 | ||
fef20d9c FW |
2028 | if (!(spec.flags & LEFT)) { |
2029 | while (--spec.field_width > 0) { | |
f796937a | 2030 | if (str < end) |
1da177e4 LT |
2031 | *str = ' '; |
2032 | ++str; | |
1da177e4 | 2033 | |
fef20d9c FW |
2034 | } |
2035 | } | |
2036 | c = (unsigned char) va_arg(args, int); | |
2037 | if (str < end) | |
2038 | *str = c; | |
2039 | ++str; | |
2040 | while (--spec.field_width > 0) { | |
f796937a | 2041 | if (str < end) |
fef20d9c | 2042 | *str = ' '; |
1da177e4 | 2043 | ++str; |
fef20d9c FW |
2044 | } |
2045 | break; | |
d4be151b | 2046 | } |
1da177e4 | 2047 | |
fef20d9c FW |
2048 | case FORMAT_TYPE_STR: |
2049 | str = string(str, end, va_arg(args, char *), spec); | |
2050 | break; | |
1da177e4 | 2051 | |
fef20d9c | 2052 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2053 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
2054 | spec); |
2055 | while (isalnum(*fmt)) | |
2056 | fmt++; | |
2057 | break; | |
1da177e4 | 2058 | |
fef20d9c FW |
2059 | case FORMAT_TYPE_PERCENT_CHAR: |
2060 | if (str < end) | |
2061 | *str = '%'; | |
2062 | ++str; | |
2063 | break; | |
1da177e4 | 2064 | |
fef20d9c | 2065 | case FORMAT_TYPE_INVALID: |
b006f19b RV |
2066 | /* |
2067 | * Presumably the arguments passed gcc's type | |
2068 | * checking, but there is no safe or sane way | |
2069 | * for us to continue parsing the format and | |
2070 | * fetching from the va_list; the remaining | |
2071 | * specifiers and arguments would be out of | |
2072 | * sync. | |
2073 | */ | |
2074 | goto out; | |
fef20d9c | 2075 | |
fef20d9c FW |
2076 | default: |
2077 | switch (spec.type) { | |
2078 | case FORMAT_TYPE_LONG_LONG: | |
2079 | num = va_arg(args, long long); | |
2080 | break; | |
2081 | case FORMAT_TYPE_ULONG: | |
2082 | num = va_arg(args, unsigned long); | |
2083 | break; | |
2084 | case FORMAT_TYPE_LONG: | |
2085 | num = va_arg(args, long); | |
2086 | break; | |
2087 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
2088 | if (spec.flags & SIGN) |
2089 | num = va_arg(args, ssize_t); | |
2090 | else | |
2091 | num = va_arg(args, size_t); | |
fef20d9c FW |
2092 | break; |
2093 | case FORMAT_TYPE_PTRDIFF: | |
2094 | num = va_arg(args, ptrdiff_t); | |
2095 | break; | |
a4e94ef0 Z |
2096 | case FORMAT_TYPE_UBYTE: |
2097 | num = (unsigned char) va_arg(args, int); | |
2098 | break; | |
2099 | case FORMAT_TYPE_BYTE: | |
2100 | num = (signed char) va_arg(args, int); | |
2101 | break; | |
fef20d9c FW |
2102 | case FORMAT_TYPE_USHORT: |
2103 | num = (unsigned short) va_arg(args, int); | |
2104 | break; | |
2105 | case FORMAT_TYPE_SHORT: | |
2106 | num = (short) va_arg(args, int); | |
2107 | break; | |
39e874f8 FW |
2108 | case FORMAT_TYPE_INT: |
2109 | num = (int) va_arg(args, int); | |
fef20d9c FW |
2110 | break; |
2111 | default: | |
2112 | num = va_arg(args, unsigned int); | |
2113 | } | |
2114 | ||
2115 | str = number(str, end, num, spec); | |
1da177e4 | 2116 | } |
1da177e4 | 2117 | } |
fef20d9c | 2118 | |
b006f19b | 2119 | out: |
f796937a JF |
2120 | if (size > 0) { |
2121 | if (str < end) | |
2122 | *str = '\0'; | |
2123 | else | |
0a6047ee | 2124 | end[-1] = '\0'; |
f796937a | 2125 | } |
fef20d9c | 2126 | |
f796937a | 2127 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 2128 | return str-buf; |
fef20d9c | 2129 | |
1da177e4 | 2130 | } |
1da177e4 LT |
2131 | EXPORT_SYMBOL(vsnprintf); |
2132 | ||
2133 | /** | |
2134 | * vscnprintf - Format a string and place it in a buffer | |
2135 | * @buf: The buffer to place the result into | |
2136 | * @size: The size of the buffer, including the trailing null space | |
2137 | * @fmt: The format string to use | |
2138 | * @args: Arguments for the format string | |
2139 | * | |
2140 | * The return value is the number of characters which have been written into | |
b921c69f | 2141 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
2142 | * returns 0. |
2143 | * | |
ba1835eb | 2144 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
2145 | * |
2146 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2147 | */ |
2148 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2149 | { | |
2150 | int i; | |
2151 | ||
7b9186f5 AGR |
2152 | i = vsnprintf(buf, size, fmt, args); |
2153 | ||
b921c69f AA |
2154 | if (likely(i < size)) |
2155 | return i; | |
2156 | if (size != 0) | |
2157 | return size - 1; | |
2158 | return 0; | |
1da177e4 | 2159 | } |
1da177e4 LT |
2160 | EXPORT_SYMBOL(vscnprintf); |
2161 | ||
2162 | /** | |
2163 | * snprintf - Format a string and place it in a buffer | |
2164 | * @buf: The buffer to place the result into | |
2165 | * @size: The size of the buffer, including the trailing null space | |
2166 | * @fmt: The format string to use | |
2167 | * @...: Arguments for the format string | |
2168 | * | |
2169 | * The return value is the number of characters which would be | |
2170 | * generated for the given input, excluding the trailing null, | |
2171 | * as per ISO C99. If the return is greater than or equal to | |
2172 | * @size, the resulting string is truncated. | |
20036fdc AK |
2173 | * |
2174 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2175 | */ |
7b9186f5 | 2176 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2177 | { |
2178 | va_list args; | |
2179 | int i; | |
2180 | ||
2181 | va_start(args, fmt); | |
7b9186f5 | 2182 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2183 | va_end(args); |
7b9186f5 | 2184 | |
1da177e4 LT |
2185 | return i; |
2186 | } | |
1da177e4 LT |
2187 | EXPORT_SYMBOL(snprintf); |
2188 | ||
2189 | /** | |
2190 | * scnprintf - Format a string and place it in a buffer | |
2191 | * @buf: The buffer to place the result into | |
2192 | * @size: The size of the buffer, including the trailing null space | |
2193 | * @fmt: The format string to use | |
2194 | * @...: Arguments for the format string | |
2195 | * | |
2196 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2197 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2198 | */ |
2199 | ||
7b9186f5 | 2200 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2201 | { |
2202 | va_list args; | |
2203 | int i; | |
2204 | ||
2205 | va_start(args, fmt); | |
b921c69f | 2206 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2207 | va_end(args); |
7b9186f5 | 2208 | |
b921c69f | 2209 | return i; |
1da177e4 LT |
2210 | } |
2211 | EXPORT_SYMBOL(scnprintf); | |
2212 | ||
2213 | /** | |
2214 | * vsprintf - Format a string and place it in a buffer | |
2215 | * @buf: The buffer to place the result into | |
2216 | * @fmt: The format string to use | |
2217 | * @args: Arguments for the format string | |
2218 | * | |
2219 | * The function returns the number of characters written | |
72fd4a35 | 2220 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2221 | * buffer overflows. |
2222 | * | |
ba1835eb | 2223 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2224 | * |
2225 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2226 | */ |
2227 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2228 | { | |
2229 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2230 | } | |
1da177e4 LT |
2231 | EXPORT_SYMBOL(vsprintf); |
2232 | ||
2233 | /** | |
2234 | * sprintf - Format a string and place it in a buffer | |
2235 | * @buf: The buffer to place the result into | |
2236 | * @fmt: The format string to use | |
2237 | * @...: Arguments for the format string | |
2238 | * | |
2239 | * The function returns the number of characters written | |
72fd4a35 | 2240 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2241 | * buffer overflows. |
20036fdc AK |
2242 | * |
2243 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2244 | */ |
7b9186f5 | 2245 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2246 | { |
2247 | va_list args; | |
2248 | int i; | |
2249 | ||
2250 | va_start(args, fmt); | |
7b9186f5 | 2251 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2252 | va_end(args); |
7b9186f5 | 2253 | |
1da177e4 LT |
2254 | return i; |
2255 | } | |
1da177e4 LT |
2256 | EXPORT_SYMBOL(sprintf); |
2257 | ||
4370aa4a LJ |
2258 | #ifdef CONFIG_BINARY_PRINTF |
2259 | /* | |
2260 | * bprintf service: | |
2261 | * vbin_printf() - VA arguments to binary data | |
2262 | * bstr_printf() - Binary data to text string | |
2263 | */ | |
2264 | ||
2265 | /** | |
2266 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2267 | * @bin_buf: The buffer to place args' binary value | |
2268 | * @size: The size of the buffer(by words(32bits), not characters) | |
2269 | * @fmt: The format string to use | |
2270 | * @args: Arguments for the format string | |
2271 | * | |
2272 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2273 | * is skipped. |
4370aa4a LJ |
2274 | * |
2275 | * The return value is the number of words(32bits) which would be generated for | |
2276 | * the given input. | |
2277 | * | |
2278 | * NOTE: | |
2279 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2280 | * valid for bstr_printf(). | |
2281 | */ | |
2282 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2283 | { | |
fef20d9c | 2284 | struct printf_spec spec = {0}; |
4370aa4a | 2285 | char *str, *end; |
4370aa4a LJ |
2286 | |
2287 | str = (char *)bin_buf; | |
2288 | end = (char *)(bin_buf + size); | |
2289 | ||
2290 | #define save_arg(type) \ | |
2291 | do { \ | |
2292 | if (sizeof(type) == 8) { \ | |
2293 | unsigned long long value; \ | |
2294 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2295 | value = va_arg(args, unsigned long long); \ | |
2296 | if (str + sizeof(type) <= end) { \ | |
2297 | *(u32 *)str = *(u32 *)&value; \ | |
2298 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2299 | } \ | |
2300 | } else { \ | |
2301 | unsigned long value; \ | |
2302 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2303 | value = va_arg(args, int); \ | |
2304 | if (str + sizeof(type) <= end) \ | |
2305 | *(typeof(type) *)str = (type)value; \ | |
2306 | } \ | |
2307 | str += sizeof(type); \ | |
2308 | } while (0) | |
2309 | ||
fef20d9c | 2310 | while (*fmt) { |
d4be151b | 2311 | int read = format_decode(fmt, &spec); |
4370aa4a | 2312 | |
fef20d9c | 2313 | fmt += read; |
4370aa4a | 2314 | |
fef20d9c FW |
2315 | switch (spec.type) { |
2316 | case FORMAT_TYPE_NONE: | |
d4be151b | 2317 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2318 | break; |
b006f19b RV |
2319 | case FORMAT_TYPE_INVALID: |
2320 | goto out; | |
fef20d9c | 2321 | |
ed681a91 | 2322 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2323 | case FORMAT_TYPE_PRECISION: |
2324 | save_arg(int); | |
2325 | break; | |
2326 | ||
2327 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2328 | save_arg(char); |
fef20d9c FW |
2329 | break; |
2330 | ||
2331 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
2332 | const char *save_str = va_arg(args, char *); |
2333 | size_t len; | |
6c356634 | 2334 | |
4370aa4a LJ |
2335 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2336 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 2337 | save_str = "(null)"; |
6c356634 AGR |
2338 | len = strlen(save_str) + 1; |
2339 | if (str + len < end) | |
2340 | memcpy(str, save_str, len); | |
2341 | str += len; | |
fef20d9c | 2342 | break; |
4370aa4a | 2343 | } |
fef20d9c FW |
2344 | |
2345 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
2346 | save_arg(void *); |
2347 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 2348 | while (isalnum(*fmt)) |
4370aa4a | 2349 | fmt++; |
fef20d9c FW |
2350 | break; |
2351 | ||
fef20d9c FW |
2352 | default: |
2353 | switch (spec.type) { | |
2354 | ||
2355 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2356 | save_arg(long long); |
fef20d9c FW |
2357 | break; |
2358 | case FORMAT_TYPE_ULONG: | |
2359 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2360 | save_arg(unsigned long); |
fef20d9c FW |
2361 | break; |
2362 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2363 | save_arg(size_t); |
fef20d9c FW |
2364 | break; |
2365 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2366 | save_arg(ptrdiff_t); |
fef20d9c | 2367 | break; |
a4e94ef0 Z |
2368 | case FORMAT_TYPE_UBYTE: |
2369 | case FORMAT_TYPE_BYTE: | |
2370 | save_arg(char); | |
2371 | break; | |
fef20d9c FW |
2372 | case FORMAT_TYPE_USHORT: |
2373 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2374 | save_arg(short); |
fef20d9c FW |
2375 | break; |
2376 | default: | |
4370aa4a | 2377 | save_arg(int); |
fef20d9c | 2378 | } |
4370aa4a LJ |
2379 | } |
2380 | } | |
fef20d9c | 2381 | |
b006f19b | 2382 | out: |
7b9186f5 | 2383 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2384 | #undef save_arg |
4370aa4a LJ |
2385 | } |
2386 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2387 | ||
2388 | /** | |
2389 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2390 | * @buf: The buffer to place the result into | |
2391 | * @size: The size of the buffer, including the trailing null space | |
2392 | * @fmt: The format string to use | |
2393 | * @bin_buf: Binary arguments for the format string | |
2394 | * | |
2395 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2396 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2397 | * a binary buffer that generated by vbin_printf. | |
2398 | * | |
2399 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2400 | * see vsnprintf comment for details. |
4370aa4a LJ |
2401 | * |
2402 | * The return value is the number of characters which would | |
2403 | * be generated for the given input, excluding the trailing | |
2404 | * '\0', as per ISO C99. If you want to have the exact | |
2405 | * number of characters written into @buf as return value | |
2406 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2407 | * return is greater than or equal to @size, the resulting | |
2408 | * string is truncated. | |
2409 | */ | |
2410 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2411 | { | |
fef20d9c | 2412 | struct printf_spec spec = {0}; |
d4be151b AGR |
2413 | char *str, *end; |
2414 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2415 | |
762abb51 | 2416 | if (WARN_ON_ONCE(size > INT_MAX)) |
4370aa4a | 2417 | return 0; |
4370aa4a LJ |
2418 | |
2419 | str = buf; | |
2420 | end = buf + size; | |
2421 | ||
2422 | #define get_arg(type) \ | |
2423 | ({ \ | |
2424 | typeof(type) value; \ | |
2425 | if (sizeof(type) == 8) { \ | |
2426 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2427 | *(u32 *)&value = *(u32 *)args; \ | |
2428 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2429 | } else { \ | |
2430 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2431 | value = *(typeof(type) *)args; \ | |
2432 | } \ | |
2433 | args += sizeof(type); \ | |
2434 | value; \ | |
2435 | }) | |
2436 | ||
2437 | /* Make sure end is always >= buf */ | |
2438 | if (end < buf) { | |
2439 | end = ((void *)-1); | |
2440 | size = end - buf; | |
2441 | } | |
2442 | ||
fef20d9c | 2443 | while (*fmt) { |
fef20d9c | 2444 | const char *old_fmt = fmt; |
d4be151b | 2445 | int read = format_decode(fmt, &spec); |
4370aa4a | 2446 | |
fef20d9c | 2447 | fmt += read; |
4370aa4a | 2448 | |
fef20d9c FW |
2449 | switch (spec.type) { |
2450 | case FORMAT_TYPE_NONE: { | |
2451 | int copy = read; | |
2452 | if (str < end) { | |
2453 | if (copy > end - str) | |
2454 | copy = end - str; | |
2455 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2456 | } |
fef20d9c FW |
2457 | str += read; |
2458 | break; | |
4370aa4a LJ |
2459 | } |
2460 | ||
ed681a91 | 2461 | case FORMAT_TYPE_WIDTH: |
4d72ba01 | 2462 | set_field_width(&spec, get_arg(int)); |
fef20d9c | 2463 | break; |
4370aa4a | 2464 | |
fef20d9c | 2465 | case FORMAT_TYPE_PRECISION: |
4d72ba01 | 2466 | set_precision(&spec, get_arg(int)); |
fef20d9c | 2467 | break; |
4370aa4a | 2468 | |
d4be151b AGR |
2469 | case FORMAT_TYPE_CHAR: { |
2470 | char c; | |
2471 | ||
fef20d9c FW |
2472 | if (!(spec.flags & LEFT)) { |
2473 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2474 | if (str < end) |
2475 | *str = ' '; | |
2476 | ++str; | |
2477 | } | |
2478 | } | |
2479 | c = (unsigned char) get_arg(char); | |
2480 | if (str < end) | |
2481 | *str = c; | |
2482 | ++str; | |
fef20d9c | 2483 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2484 | if (str < end) |
2485 | *str = ' '; | |
2486 | ++str; | |
2487 | } | |
fef20d9c | 2488 | break; |
d4be151b | 2489 | } |
4370aa4a | 2490 | |
fef20d9c | 2491 | case FORMAT_TYPE_STR: { |
4370aa4a | 2492 | const char *str_arg = args; |
d4be151b | 2493 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2494 | str = string(str, end, (char *)str_arg, spec); |
2495 | break; | |
4370aa4a LJ |
2496 | } |
2497 | ||
fef20d9c | 2498 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2499 | str = pointer(fmt, str, end, get_arg(void *), spec); |
fef20d9c | 2500 | while (isalnum(*fmt)) |
4370aa4a | 2501 | fmt++; |
fef20d9c | 2502 | break; |
4370aa4a | 2503 | |
fef20d9c | 2504 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
2505 | if (str < end) |
2506 | *str = '%'; | |
2507 | ++str; | |
fef20d9c FW |
2508 | break; |
2509 | ||
b006f19b RV |
2510 | case FORMAT_TYPE_INVALID: |
2511 | goto out; | |
2512 | ||
d4be151b AGR |
2513 | default: { |
2514 | unsigned long long num; | |
2515 | ||
fef20d9c FW |
2516 | switch (spec.type) { |
2517 | ||
2518 | case FORMAT_TYPE_LONG_LONG: | |
2519 | num = get_arg(long long); | |
2520 | break; | |
2521 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2522 | case FORMAT_TYPE_LONG: |
2523 | num = get_arg(unsigned long); | |
2524 | break; | |
2525 | case FORMAT_TYPE_SIZE_T: | |
2526 | num = get_arg(size_t); | |
2527 | break; | |
2528 | case FORMAT_TYPE_PTRDIFF: | |
2529 | num = get_arg(ptrdiff_t); | |
2530 | break; | |
a4e94ef0 Z |
2531 | case FORMAT_TYPE_UBYTE: |
2532 | num = get_arg(unsigned char); | |
2533 | break; | |
2534 | case FORMAT_TYPE_BYTE: | |
2535 | num = get_arg(signed char); | |
2536 | break; | |
fef20d9c FW |
2537 | case FORMAT_TYPE_USHORT: |
2538 | num = get_arg(unsigned short); | |
2539 | break; | |
2540 | case FORMAT_TYPE_SHORT: | |
2541 | num = get_arg(short); | |
2542 | break; | |
2543 | case FORMAT_TYPE_UINT: | |
2544 | num = get_arg(unsigned int); | |
2545 | break; | |
2546 | default: | |
2547 | num = get_arg(int); | |
2548 | } | |
2549 | ||
2550 | str = number(str, end, num, spec); | |
d4be151b AGR |
2551 | } /* default: */ |
2552 | } /* switch(spec.type) */ | |
2553 | } /* while(*fmt) */ | |
fef20d9c | 2554 | |
b006f19b | 2555 | out: |
4370aa4a LJ |
2556 | if (size > 0) { |
2557 | if (str < end) | |
2558 | *str = '\0'; | |
2559 | else | |
2560 | end[-1] = '\0'; | |
2561 | } | |
fef20d9c | 2562 | |
4370aa4a LJ |
2563 | #undef get_arg |
2564 | ||
2565 | /* the trailing null byte doesn't count towards the total */ | |
2566 | return str - buf; | |
2567 | } | |
2568 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2569 | ||
2570 | /** | |
2571 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2572 | * @bin_buf: The buffer to place args' binary value | |
2573 | * @size: The size of the buffer(by words(32bits), not characters) | |
2574 | * @fmt: The format string to use | |
2575 | * @...: Arguments for the format string | |
2576 | * | |
2577 | * The function returns the number of words(u32) written | |
2578 | * into @bin_buf. | |
2579 | */ | |
2580 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2581 | { | |
2582 | va_list args; | |
2583 | int ret; | |
2584 | ||
2585 | va_start(args, fmt); | |
2586 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2587 | va_end(args); | |
7b9186f5 | 2588 | |
4370aa4a LJ |
2589 | return ret; |
2590 | } | |
2591 | EXPORT_SYMBOL_GPL(bprintf); | |
2592 | ||
2593 | #endif /* CONFIG_BINARY_PRINTF */ | |
2594 | ||
1da177e4 LT |
2595 | /** |
2596 | * vsscanf - Unformat a buffer into a list of arguments | |
2597 | * @buf: input buffer | |
2598 | * @fmt: format of buffer | |
2599 | * @args: arguments | |
2600 | */ | |
7b9186f5 | 2601 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2602 | { |
2603 | const char *str = buf; | |
2604 | char *next; | |
2605 | char digit; | |
2606 | int num = 0; | |
ef0658f3 | 2607 | u8 qualifier; |
53809751 JB |
2608 | unsigned int base; |
2609 | union { | |
2610 | long long s; | |
2611 | unsigned long long u; | |
2612 | } val; | |
ef0658f3 | 2613 | s16 field_width; |
d4be151b | 2614 | bool is_sign; |
1da177e4 | 2615 | |
da99075c | 2616 | while (*fmt) { |
1da177e4 LT |
2617 | /* skip any white space in format */ |
2618 | /* white space in format matchs any amount of | |
2619 | * white space, including none, in the input. | |
2620 | */ | |
2621 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2622 | fmt = skip_spaces(++fmt); |
2623 | str = skip_spaces(str); | |
1da177e4 LT |
2624 | } |
2625 | ||
2626 | /* anything that is not a conversion must match exactly */ | |
2627 | if (*fmt != '%' && *fmt) { | |
2628 | if (*fmt++ != *str++) | |
2629 | break; | |
2630 | continue; | |
2631 | } | |
2632 | ||
2633 | if (!*fmt) | |
2634 | break; | |
2635 | ++fmt; | |
7b9186f5 | 2636 | |
1da177e4 LT |
2637 | /* skip this conversion. |
2638 | * advance both strings to next white space | |
2639 | */ | |
2640 | if (*fmt == '*') { | |
da99075c JB |
2641 | if (!*str) |
2642 | break; | |
f9310b2f JY |
2643 | while (!isspace(*fmt) && *fmt != '%' && *fmt) { |
2644 | /* '%*[' not yet supported, invalid format */ | |
2645 | if (*fmt == '[') | |
2646 | return num; | |
1da177e4 | 2647 | fmt++; |
f9310b2f | 2648 | } |
1da177e4 LT |
2649 | while (!isspace(*str) && *str) |
2650 | str++; | |
2651 | continue; | |
2652 | } | |
2653 | ||
2654 | /* get field width */ | |
2655 | field_width = -1; | |
53809751 | 2656 | if (isdigit(*fmt)) { |
1da177e4 | 2657 | field_width = skip_atoi(&fmt); |
53809751 JB |
2658 | if (field_width <= 0) |
2659 | break; | |
2660 | } | |
1da177e4 LT |
2661 | |
2662 | /* get conversion qualifier */ | |
2663 | qualifier = -1; | |
75fb8f26 AS |
2664 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2665 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
2666 | qualifier = *fmt++; |
2667 | if (unlikely(qualifier == *fmt)) { | |
2668 | if (qualifier == 'h') { | |
2669 | qualifier = 'H'; | |
2670 | fmt++; | |
2671 | } else if (qualifier == 'l') { | |
2672 | qualifier = 'L'; | |
2673 | fmt++; | |
2674 | } | |
2675 | } | |
2676 | } | |
1da177e4 | 2677 | |
da99075c JB |
2678 | if (!*fmt) |
2679 | break; | |
2680 | ||
2681 | if (*fmt == 'n') { | |
2682 | /* return number of characters read so far */ | |
2683 | *va_arg(args, int *) = str - buf; | |
2684 | ++fmt; | |
2685 | continue; | |
2686 | } | |
2687 | ||
2688 | if (!*str) | |
1da177e4 LT |
2689 | break; |
2690 | ||
d4be151b | 2691 | base = 10; |
3f623eba | 2692 | is_sign = false; |
d4be151b | 2693 | |
7b9186f5 | 2694 | switch (*fmt++) { |
1da177e4 LT |
2695 | case 'c': |
2696 | { | |
7b9186f5 | 2697 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2698 | if (field_width == -1) |
2699 | field_width = 1; | |
2700 | do { | |
2701 | *s++ = *str++; | |
2702 | } while (--field_width > 0 && *str); | |
2703 | num++; | |
2704 | } | |
2705 | continue; | |
2706 | case 's': | |
2707 | { | |
7b9186f5 AGR |
2708 | char *s = (char *)va_arg(args, char *); |
2709 | if (field_width == -1) | |
4be929be | 2710 | field_width = SHRT_MAX; |
1da177e4 | 2711 | /* first, skip leading white space in buffer */ |
e7d2860b | 2712 | str = skip_spaces(str); |
1da177e4 LT |
2713 | |
2714 | /* now copy until next white space */ | |
7b9186f5 | 2715 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2716 | *s++ = *str++; |
1da177e4 LT |
2717 | *s = '\0'; |
2718 | num++; | |
2719 | } | |
2720 | continue; | |
f9310b2f JY |
2721 | /* |
2722 | * Warning: This implementation of the '[' conversion specifier | |
2723 | * deviates from its glibc counterpart in the following ways: | |
2724 | * (1) It does NOT support ranges i.e. '-' is NOT a special | |
2725 | * character | |
2726 | * (2) It cannot match the closing bracket ']' itself | |
2727 | * (3) A field width is required | |
2728 | * (4) '%*[' (discard matching input) is currently not supported | |
2729 | * | |
2730 | * Example usage: | |
2731 | * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]", | |
2732 | * buf1, buf2, buf3); | |
2733 | * if (ret < 3) | |
2734 | * // etc.. | |
2735 | */ | |
2736 | case '[': | |
2737 | { | |
2738 | char *s = (char *)va_arg(args, char *); | |
2739 | DECLARE_BITMAP(set, 256) = {0}; | |
2740 | unsigned int len = 0; | |
2741 | bool negate = (*fmt == '^'); | |
2742 | ||
2743 | /* field width is required */ | |
2744 | if (field_width == -1) | |
2745 | return num; | |
2746 | ||
2747 | if (negate) | |
2748 | ++fmt; | |
2749 | ||
2750 | for ( ; *fmt && *fmt != ']'; ++fmt, ++len) | |
2751 | set_bit((u8)*fmt, set); | |
2752 | ||
2753 | /* no ']' or no character set found */ | |
2754 | if (!*fmt || !len) | |
2755 | return num; | |
2756 | ++fmt; | |
2757 | ||
2758 | if (negate) { | |
2759 | bitmap_complement(set, set, 256); | |
2760 | /* exclude null '\0' byte */ | |
2761 | clear_bit(0, set); | |
2762 | } | |
2763 | ||
2764 | /* match must be non-empty */ | |
2765 | if (!test_bit((u8)*str, set)) | |
2766 | return num; | |
2767 | ||
2768 | while (test_bit((u8)*str, set) && field_width--) | |
2769 | *s++ = *str++; | |
2770 | *s = '\0'; | |
2771 | ++num; | |
2772 | } | |
2773 | continue; | |
1da177e4 LT |
2774 | case 'o': |
2775 | base = 8; | |
2776 | break; | |
2777 | case 'x': | |
2778 | case 'X': | |
2779 | base = 16; | |
2780 | break; | |
2781 | case 'i': | |
7b9186f5 | 2782 | base = 0; |
1da177e4 | 2783 | case 'd': |
3f623eba | 2784 | is_sign = true; |
1da177e4 LT |
2785 | case 'u': |
2786 | break; | |
2787 | case '%': | |
2788 | /* looking for '%' in str */ | |
7b9186f5 | 2789 | if (*str++ != '%') |
1da177e4 LT |
2790 | return num; |
2791 | continue; | |
2792 | default: | |
2793 | /* invalid format; stop here */ | |
2794 | return num; | |
2795 | } | |
2796 | ||
2797 | /* have some sort of integer conversion. | |
2798 | * first, skip white space in buffer. | |
2799 | */ | |
e7d2860b | 2800 | str = skip_spaces(str); |
1da177e4 LT |
2801 | |
2802 | digit = *str; | |
2803 | if (is_sign && digit == '-') | |
2804 | digit = *(str + 1); | |
2805 | ||
2806 | if (!digit | |
7b9186f5 AGR |
2807 | || (base == 16 && !isxdigit(digit)) |
2808 | || (base == 10 && !isdigit(digit)) | |
2809 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2810 | || (base == 0 && !isdigit(digit))) | |
2811 | break; | |
1da177e4 | 2812 | |
53809751 JB |
2813 | if (is_sign) |
2814 | val.s = qualifier != 'L' ? | |
2815 | simple_strtol(str, &next, base) : | |
2816 | simple_strtoll(str, &next, base); | |
2817 | else | |
2818 | val.u = qualifier != 'L' ? | |
2819 | simple_strtoul(str, &next, base) : | |
2820 | simple_strtoull(str, &next, base); | |
2821 | ||
2822 | if (field_width > 0 && next - str > field_width) { | |
2823 | if (base == 0) | |
2824 | _parse_integer_fixup_radix(str, &base); | |
2825 | while (next - str > field_width) { | |
2826 | if (is_sign) | |
2827 | val.s = div_s64(val.s, base); | |
2828 | else | |
2829 | val.u = div_u64(val.u, base); | |
2830 | --next; | |
2831 | } | |
2832 | } | |
2833 | ||
7b9186f5 | 2834 | switch (qualifier) { |
1da177e4 | 2835 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2836 | if (is_sign) |
2837 | *va_arg(args, signed char *) = val.s; | |
2838 | else | |
2839 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2840 | break; |
2841 | case 'h': | |
53809751 JB |
2842 | if (is_sign) |
2843 | *va_arg(args, short *) = val.s; | |
2844 | else | |
2845 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2846 | break; |
2847 | case 'l': | |
53809751 JB |
2848 | if (is_sign) |
2849 | *va_arg(args, long *) = val.s; | |
2850 | else | |
2851 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2852 | break; |
2853 | case 'L': | |
53809751 JB |
2854 | if (is_sign) |
2855 | *va_arg(args, long long *) = val.s; | |
2856 | else | |
2857 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 LT |
2858 | break; |
2859 | case 'Z': | |
2860 | case 'z': | |
53809751 JB |
2861 | *va_arg(args, size_t *) = val.u; |
2862 | break; | |
1da177e4 | 2863 | default: |
53809751 JB |
2864 | if (is_sign) |
2865 | *va_arg(args, int *) = val.s; | |
2866 | else | |
2867 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
2868 | break; |
2869 | } | |
2870 | num++; | |
2871 | ||
2872 | if (!next) | |
2873 | break; | |
2874 | str = next; | |
2875 | } | |
c6b40d16 | 2876 | |
1da177e4 LT |
2877 | return num; |
2878 | } | |
1da177e4 LT |
2879 | EXPORT_SYMBOL(vsscanf); |
2880 | ||
2881 | /** | |
2882 | * sscanf - Unformat a buffer into a list of arguments | |
2883 | * @buf: input buffer | |
2884 | * @fmt: formatting of buffer | |
2885 | * @...: resulting arguments | |
2886 | */ | |
7b9186f5 | 2887 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2888 | { |
2889 | va_list args; | |
2890 | int i; | |
2891 | ||
7b9186f5 AGR |
2892 | va_start(args, fmt); |
2893 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2894 | va_end(args); |
7b9186f5 | 2895 | |
1da177e4 LT |
2896 | return i; |
2897 | } | |
1da177e4 | 2898 | EXPORT_SYMBOL(sscanf); |