Commit | Line | Data |
---|---|---|
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> | |
20 | #include <linux/module.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
0fe1ef24 LT |
25 | #include <linux/kallsyms.h> |
26 | #include <linux/uaccess.h> | |
332d2e78 | 27 | #include <linux/ioport.h> |
8a27f7c9 | 28 | #include <net/addrconf.h> |
1da177e4 | 29 | |
4e57b681 | 30 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 | 31 | #include <asm/div64.h> |
deac93df | 32 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 33 | |
9b706aee DV |
34 | /* Works only for digits and letters, but small and fast */ |
35 | #define TOLOWER(x) ((x) | 0x20) | |
36 | ||
aa46a63e HH |
37 | static unsigned int simple_guess_base(const char *cp) |
38 | { | |
39 | if (cp[0] == '0') { | |
40 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) | |
41 | return 16; | |
42 | else | |
43 | return 8; | |
44 | } else { | |
45 | return 10; | |
46 | } | |
47 | } | |
48 | ||
1da177e4 | 49 | /** |
922ac25c | 50 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
51 | * @cp: The start of the string |
52 | * @endp: A pointer to the end of the parsed string will be placed here | |
53 | * @base: The number base to use | |
54 | */ | |
922ac25c | 55 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 56 | { |
922ac25c | 57 | unsigned long long result = 0; |
aa46a63e HH |
58 | |
59 | if (!base) | |
60 | base = simple_guess_base(cp); | |
61 | ||
62 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
63 | cp += 2; | |
64 | ||
65 | while (isxdigit(*cp)) { | |
66 | unsigned int value; | |
67 | ||
68 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
69 | if (value >= base) | |
70 | break; | |
71 | result = result * base + value; | |
1da177e4 LT |
72 | cp++; |
73 | } | |
74 | if (endp) | |
75 | *endp = (char *)cp; | |
7b9186f5 | 76 | |
1da177e4 LT |
77 | return result; |
78 | } | |
922ac25c | 79 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
80 | |
81 | /** | |
922ac25c | 82 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
83 | * @cp: The start of the string |
84 | * @endp: A pointer to the end of the parsed string will be placed here | |
85 | * @base: The number base to use | |
86 | */ | |
922ac25c | 87 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 88 | { |
922ac25c | 89 | return simple_strtoull(cp, endp, base); |
1da177e4 | 90 | } |
922ac25c | 91 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
92 | |
93 | /** | |
922ac25c | 94 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
95 | * @cp: The start of the string |
96 | * @endp: A pointer to the end of the parsed string will be placed here | |
97 | * @base: The number base to use | |
98 | */ | |
922ac25c | 99 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 100 | { |
922ac25c AGR |
101 | if (*cp == '-') |
102 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 103 | |
922ac25c | 104 | return simple_strtoul(cp, endp, base); |
1da177e4 | 105 | } |
922ac25c | 106 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
107 | |
108 | /** | |
109 | * simple_strtoll - convert a string to a signed long long | |
110 | * @cp: The start of the string | |
111 | * @endp: A pointer to the end of the parsed string will be placed here | |
112 | * @base: The number base to use | |
113 | */ | |
22d27051 | 114 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 115 | { |
7b9186f5 | 116 | if (*cp == '-') |
22d27051 | 117 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 118 | |
22d27051 | 119 | return simple_strtoull(cp, endp, base); |
1da177e4 | 120 | } |
98d5ce0d | 121 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 122 | |
06b2a76d YY |
123 | /** |
124 | * strict_strtoul - convert a string to an unsigned long strictly | |
125 | * @cp: The string to be converted | |
126 | * @base: The number base to use | |
127 | * @res: The converted result value | |
128 | * | |
129 | * strict_strtoul converts a string to an unsigned long only if the | |
130 | * string is really an unsigned long string, any string containing | |
131 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
132 | * only a newline char at the tail is acceptible because people generally | |
133 | * change a module parameter in the following way: | |
134 | * | |
135 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
136 | * | |
137 | * echo will append a newline to the tail. | |
138 | * | |
139 | * It returns 0 if conversion is successful and *res is set to the converted | |
140 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
141 | * | |
142 | * simple_strtoul just ignores the successive invalid characters and | |
143 | * return the converted value of prefix part of the string. | |
144 | */ | |
9d85db22 HH |
145 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) |
146 | { | |
147 | char *tail; | |
148 | unsigned long val; | |
149 | size_t len; | |
150 | ||
151 | *res = 0; | |
152 | len = strlen(cp); | |
153 | if (len == 0) | |
154 | return -EINVAL; | |
155 | ||
156 | val = simple_strtoul(cp, &tail, base); | |
e899aa82 PM |
157 | if (tail == cp) |
158 | return -EINVAL; | |
7b9186f5 | 159 | |
9d85db22 HH |
160 | if ((*tail == '\0') || |
161 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
162 | *res = val; | |
163 | return 0; | |
164 | } | |
165 | ||
166 | return -EINVAL; | |
167 | } | |
168 | EXPORT_SYMBOL(strict_strtoul); | |
06b2a76d YY |
169 | |
170 | /** | |
171 | * strict_strtol - convert a string to a long strictly | |
172 | * @cp: The string to be converted | |
173 | * @base: The number base to use | |
174 | * @res: The converted result value | |
175 | * | |
176 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
177 | * character of a string is '-'. | |
178 | * | |
179 | * It returns 0 if conversion is successful and *res is set to the converted | |
180 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
181 | */ | |
9d85db22 HH |
182 | int strict_strtol(const char *cp, unsigned int base, long *res) |
183 | { | |
184 | int ret; | |
185 | if (*cp == '-') { | |
186 | ret = strict_strtoul(cp + 1, base, (unsigned long *)res); | |
187 | if (!ret) | |
188 | *res = -(*res); | |
189 | } else { | |
190 | ret = strict_strtoul(cp, base, (unsigned long *)res); | |
191 | } | |
192 | ||
193 | return ret; | |
194 | } | |
195 | EXPORT_SYMBOL(strict_strtol); | |
06b2a76d YY |
196 | |
197 | /** | |
198 | * strict_strtoull - convert a string to an unsigned long long strictly | |
199 | * @cp: The string to be converted | |
200 | * @base: The number base to use | |
201 | * @res: The converted result value | |
202 | * | |
203 | * strict_strtoull converts a string to an unsigned long long only if the | |
204 | * string is really an unsigned long long string, any string containing | |
205 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
206 | * only a newline char at the tail is acceptible because people generally | |
207 | * change a module parameter in the following way: | |
208 | * | |
209 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
210 | * | |
211 | * echo will append a newline to the tail of the string. | |
212 | * | |
213 | * It returns 0 if conversion is successful and *res is set to the converted | |
214 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
215 | * | |
216 | * simple_strtoull just ignores the successive invalid characters and | |
217 | * return the converted value of prefix part of the string. | |
218 | */ | |
9d85db22 HH |
219 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) |
220 | { | |
221 | char *tail; | |
222 | unsigned long long val; | |
223 | size_t len; | |
224 | ||
225 | *res = 0; | |
226 | len = strlen(cp); | |
227 | if (len == 0) | |
228 | return -EINVAL; | |
229 | ||
230 | val = simple_strtoull(cp, &tail, base); | |
e899aa82 PM |
231 | if (tail == cp) |
232 | return -EINVAL; | |
9d85db22 HH |
233 | if ((*tail == '\0') || |
234 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
235 | *res = val; | |
236 | return 0; | |
237 | } | |
238 | ||
239 | return -EINVAL; | |
240 | } | |
241 | EXPORT_SYMBOL(strict_strtoull); | |
06b2a76d YY |
242 | |
243 | /** | |
244 | * strict_strtoll - convert a string to a long long strictly | |
245 | * @cp: The string to be converted | |
246 | * @base: The number base to use | |
247 | * @res: The converted result value | |
248 | * | |
249 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
250 | * character of a string is '-'. | |
251 | * | |
252 | * It returns 0 if conversion is successful and *res is set to the converted | |
253 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
254 | */ | |
9d85db22 HH |
255 | int strict_strtoll(const char *cp, unsigned int base, long long *res) |
256 | { | |
257 | int ret; | |
258 | if (*cp == '-') { | |
259 | ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); | |
260 | if (!ret) | |
261 | *res = -(*res); | |
262 | } else { | |
263 | ret = strict_strtoull(cp, base, (unsigned long long *)res); | |
264 | } | |
06b2a76d | 265 | |
9d85db22 HH |
266 | return ret; |
267 | } | |
06b2a76d | 268 | EXPORT_SYMBOL(strict_strtoll); |
06b2a76d | 269 | |
1da177e4 LT |
270 | static int skip_atoi(const char **s) |
271 | { | |
7b9186f5 | 272 | int i = 0; |
1da177e4 LT |
273 | |
274 | while (isdigit(**s)) | |
275 | i = i*10 + *((*s)++) - '0'; | |
7b9186f5 | 276 | |
1da177e4 LT |
277 | return i; |
278 | } | |
279 | ||
4277eedd DV |
280 | /* Decimal conversion is by far the most typical, and is used |
281 | * for /proc and /sys data. This directly impacts e.g. top performance | |
282 | * with many processes running. We optimize it for speed | |
283 | * using code from | |
284 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
285 | * (with permission from the author, Douglas W. Jones). */ | |
286 | ||
287 | /* Formats correctly any integer in [0,99999]. | |
288 | * Outputs from one to five digits depending on input. | |
289 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
7b9186f5 | 290 | static char *put_dec_trunc(char *buf, unsigned q) |
4277eedd DV |
291 | { |
292 | unsigned d3, d2, d1, d0; | |
293 | d1 = (q>>4) & 0xf; | |
294 | d2 = (q>>8) & 0xf; | |
295 | d3 = (q>>12); | |
296 | ||
297 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
298 | q = (d0 * 0xcd) >> 11; | |
299 | d0 = d0 - 10*q; | |
300 | *buf++ = d0 + '0'; /* least significant digit */ | |
301 | d1 = q + 9*d3 + 5*d2 + d1; | |
302 | if (d1 != 0) { | |
303 | q = (d1 * 0xcd) >> 11; | |
304 | d1 = d1 - 10*q; | |
305 | *buf++ = d1 + '0'; /* next digit */ | |
306 | ||
307 | d2 = q + 2*d2; | |
308 | if ((d2 != 0) || (d3 != 0)) { | |
309 | q = (d2 * 0xd) >> 7; | |
310 | d2 = d2 - 10*q; | |
311 | *buf++ = d2 + '0'; /* next digit */ | |
312 | ||
313 | d3 = q + 4*d3; | |
314 | if (d3 != 0) { | |
315 | q = (d3 * 0xcd) >> 11; | |
316 | d3 = d3 - 10*q; | |
317 | *buf++ = d3 + '0'; /* next digit */ | |
318 | if (q != 0) | |
7b9186f5 | 319 | *buf++ = q + '0'; /* most sign. digit */ |
4277eedd DV |
320 | } |
321 | } | |
322 | } | |
7b9186f5 | 323 | |
4277eedd DV |
324 | return buf; |
325 | } | |
326 | /* Same with if's removed. Always emits five digits */ | |
7b9186f5 | 327 | static char *put_dec_full(char *buf, unsigned q) |
4277eedd DV |
328 | { |
329 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
330 | /* but anyway, gcc produces better code with full-sized ints */ | |
331 | unsigned d3, d2, d1, d0; | |
332 | d1 = (q>>4) & 0xf; | |
333 | d2 = (q>>8) & 0xf; | |
334 | d3 = (q>>12); | |
335 | ||
7b9186f5 AGR |
336 | /* |
337 | * Possible ways to approx. divide by 10 | |
338 | * gcc -O2 replaces multiply with shifts and adds | |
339 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
340 | * (x * 0x67) >> 10: 1100111 | |
341 | * (x * 0x34) >> 9: 110100 - same | |
342 | * (x * 0x1a) >> 8: 11010 - same | |
343 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
344 | */ | |
4277eedd DV |
345 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
346 | q = (d0 * 0xcd) >> 11; | |
347 | d0 = d0 - 10*q; | |
348 | *buf++ = d0 + '0'; | |
349 | d1 = q + 9*d3 + 5*d2 + d1; | |
350 | q = (d1 * 0xcd) >> 11; | |
351 | d1 = d1 - 10*q; | |
352 | *buf++ = d1 + '0'; | |
353 | ||
354 | d2 = q + 2*d2; | |
355 | q = (d2 * 0xd) >> 7; | |
356 | d2 = d2 - 10*q; | |
357 | *buf++ = d2 + '0'; | |
358 | ||
359 | d3 = q + 4*d3; | |
360 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
361 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
362 | d3 = d3 - 10*q; | |
363 | *buf++ = d3 + '0'; | |
364 | *buf++ = q + '0'; | |
7b9186f5 | 365 | |
4277eedd DV |
366 | return buf; |
367 | } | |
368 | /* No inlining helps gcc to use registers better */ | |
7b9186f5 | 369 | static noinline char *put_dec(char *buf, unsigned long long num) |
4277eedd DV |
370 | { |
371 | while (1) { | |
372 | unsigned rem; | |
373 | if (num < 100000) | |
374 | return put_dec_trunc(buf, num); | |
375 | rem = do_div(num, 100000); | |
376 | buf = put_dec_full(buf, rem); | |
377 | } | |
378 | } | |
379 | ||
1da177e4 LT |
380 | #define ZEROPAD 1 /* pad with zero */ |
381 | #define SIGN 2 /* unsigned/signed long */ | |
382 | #define PLUS 4 /* show plus */ | |
383 | #define SPACE 8 /* space if plus */ | |
384 | #define LEFT 16 /* left justified */ | |
b89dc5d6 BH |
385 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
386 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 387 | |
fef20d9c FW |
388 | enum format_type { |
389 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 390 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
391 | FORMAT_TYPE_PRECISION, |
392 | FORMAT_TYPE_CHAR, | |
393 | FORMAT_TYPE_STR, | |
394 | FORMAT_TYPE_PTR, | |
395 | FORMAT_TYPE_PERCENT_CHAR, | |
396 | FORMAT_TYPE_INVALID, | |
397 | FORMAT_TYPE_LONG_LONG, | |
398 | FORMAT_TYPE_ULONG, | |
399 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
400 | FORMAT_TYPE_UBYTE, |
401 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
402 | FORMAT_TYPE_USHORT, |
403 | FORMAT_TYPE_SHORT, | |
404 | FORMAT_TYPE_UINT, | |
405 | FORMAT_TYPE_INT, | |
406 | FORMAT_TYPE_NRCHARS, | |
407 | FORMAT_TYPE_SIZE_T, | |
408 | FORMAT_TYPE_PTRDIFF | |
409 | }; | |
410 | ||
411 | struct printf_spec { | |
4e310fda | 412 | u8 type; /* format_type enum */ |
ef0658f3 | 413 | u8 flags; /* flags to number() */ |
4e310fda JP |
414 | u8 base; /* number base, 8, 10 or 16 only */ |
415 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
416 | s16 field_width; /* width of output field */ | |
417 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
418 | }; |
419 | ||
420 | static char *number(char *buf, char *end, unsigned long long num, | |
421 | struct printf_spec spec) | |
1da177e4 | 422 | { |
9b706aee DV |
423 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
424 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
425 | ||
426 | char tmp[66]; | |
427 | char sign; | |
428 | char locase; | |
fef20d9c | 429 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 LT |
430 | int i; |
431 | ||
9b706aee DV |
432 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
433 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
434 | locase = (spec.flags & SMALL); |
435 | if (spec.flags & LEFT) | |
436 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 437 | sign = 0; |
fef20d9c | 438 | if (spec.flags & SIGN) { |
7b9186f5 | 439 | if ((signed long long)num < 0) { |
1da177e4 | 440 | sign = '-'; |
7b9186f5 | 441 | num = -(signed long long)num; |
fef20d9c FW |
442 | spec.field_width--; |
443 | } else if (spec.flags & PLUS) { | |
1da177e4 | 444 | sign = '+'; |
fef20d9c FW |
445 | spec.field_width--; |
446 | } else if (spec.flags & SPACE) { | |
1da177e4 | 447 | sign = ' '; |
fef20d9c | 448 | spec.field_width--; |
1da177e4 LT |
449 | } |
450 | } | |
b39a7340 | 451 | if (need_pfx) { |
fef20d9c FW |
452 | spec.field_width--; |
453 | if (spec.base == 16) | |
454 | spec.field_width--; | |
1da177e4 | 455 | } |
b39a7340 DV |
456 | |
457 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
458 | i = 0; |
459 | if (num == 0) | |
b39a7340 | 460 | tmp[i++] = '0'; |
4277eedd DV |
461 | /* Generic code, for any base: |
462 | else do { | |
9b706aee | 463 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
464 | } while (num != 0); |
465 | */ | |
fef20d9c FW |
466 | else if (spec.base != 10) { /* 8 or 16 */ |
467 | int mask = spec.base - 1; | |
b39a7340 | 468 | int shift = 3; |
7b9186f5 AGR |
469 | |
470 | if (spec.base == 16) | |
471 | shift = 4; | |
b39a7340 | 472 | do { |
9b706aee | 473 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
474 | num >>= shift; |
475 | } while (num); | |
4277eedd DV |
476 | } else { /* base 10 */ |
477 | i = put_dec(tmp, num) - tmp; | |
478 | } | |
b39a7340 DV |
479 | |
480 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
481 | if (i > spec.precision) |
482 | spec.precision = i; | |
b39a7340 | 483 | /* leading space padding */ |
fef20d9c FW |
484 | spec.field_width -= spec.precision; |
485 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
7b9186f5 | 486 | while (--spec.field_width >= 0) { |
f796937a | 487 | if (buf < end) |
1da177e4 LT |
488 | *buf = ' '; |
489 | ++buf; | |
490 | } | |
491 | } | |
b39a7340 | 492 | /* sign */ |
1da177e4 | 493 | if (sign) { |
f796937a | 494 | if (buf < end) |
1da177e4 LT |
495 | *buf = sign; |
496 | ++buf; | |
497 | } | |
b39a7340 DV |
498 | /* "0x" / "0" prefix */ |
499 | if (need_pfx) { | |
500 | if (buf < end) | |
501 | *buf = '0'; | |
502 | ++buf; | |
fef20d9c | 503 | if (spec.base == 16) { |
f796937a | 504 | if (buf < end) |
9b706aee | 505 | *buf = ('X' | locase); |
1da177e4 LT |
506 | ++buf; |
507 | } | |
508 | } | |
b39a7340 | 509 | /* zero or space padding */ |
fef20d9c FW |
510 | if (!(spec.flags & LEFT)) { |
511 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
512 | while (--spec.field_width >= 0) { | |
f796937a | 513 | if (buf < end) |
1da177e4 LT |
514 | *buf = c; |
515 | ++buf; | |
516 | } | |
517 | } | |
b39a7340 | 518 | /* hmm even more zero padding? */ |
fef20d9c | 519 | while (i <= --spec.precision) { |
f796937a | 520 | if (buf < end) |
1da177e4 LT |
521 | *buf = '0'; |
522 | ++buf; | |
523 | } | |
b39a7340 DV |
524 | /* actual digits of result */ |
525 | while (--i >= 0) { | |
f796937a | 526 | if (buf < end) |
1da177e4 LT |
527 | *buf = tmp[i]; |
528 | ++buf; | |
529 | } | |
b39a7340 | 530 | /* trailing space padding */ |
fef20d9c | 531 | while (--spec.field_width >= 0) { |
f796937a | 532 | if (buf < end) |
1da177e4 LT |
533 | *buf = ' '; |
534 | ++buf; | |
535 | } | |
7b9186f5 | 536 | |
1da177e4 LT |
537 | return buf; |
538 | } | |
539 | ||
0f4f81dc | 540 | static char *string(char *buf, char *end, const char *s, struct printf_spec spec) |
0f9bfa56 LT |
541 | { |
542 | int len, i; | |
543 | ||
544 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 545 | s = "(null)"; |
0f9bfa56 | 546 | |
fef20d9c | 547 | len = strnlen(s, spec.precision); |
0f9bfa56 | 548 | |
fef20d9c FW |
549 | if (!(spec.flags & LEFT)) { |
550 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
551 | if (buf < end) |
552 | *buf = ' '; | |
553 | ++buf; | |
554 | } | |
555 | } | |
556 | for (i = 0; i < len; ++i) { | |
557 | if (buf < end) | |
558 | *buf = *s; | |
559 | ++buf; ++s; | |
560 | } | |
fef20d9c | 561 | while (len < spec.field_width--) { |
0f9bfa56 LT |
562 | if (buf < end) |
563 | *buf = ' '; | |
564 | ++buf; | |
565 | } | |
7b9186f5 | 566 | |
0f9bfa56 LT |
567 | return buf; |
568 | } | |
569 | ||
fef20d9c | 570 | static char *symbol_string(char *buf, char *end, void *ptr, |
0c8b946e | 571 | struct printf_spec spec, char ext) |
0fe1ef24 LT |
572 | { |
573 | unsigned long value = (unsigned long) ptr; | |
574 | #ifdef CONFIG_KALLSYMS | |
575 | char sym[KSYM_SYMBOL_LEN]; | |
91adcd2c | 576 | if (ext != 'f' && ext != 's') |
0c8b946e FW |
577 | sprint_symbol(sym, value); |
578 | else | |
579 | kallsyms_lookup(value, NULL, NULL, NULL, sym); | |
7b9186f5 | 580 | |
fef20d9c | 581 | return string(buf, end, sym, spec); |
0fe1ef24 | 582 | #else |
7b9186f5 | 583 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
584 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
585 | spec.base = 16; | |
7b9186f5 | 586 | |
fef20d9c | 587 | return number(buf, end, value, spec); |
0fe1ef24 LT |
588 | #endif |
589 | } | |
590 | ||
fef20d9c | 591 | static char *resource_string(char *buf, char *end, struct resource *res, |
fd95541e | 592 | struct printf_spec spec, const char *fmt) |
332d2e78 LT |
593 | { |
594 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 595 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
596 | #endif |
597 | ||
598 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 599 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 600 | #endif |
4da0b66c | 601 | static const struct printf_spec io_spec = { |
fef20d9c | 602 | .base = 16, |
4da0b66c | 603 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
604 | .precision = -1, |
605 | .flags = SPECIAL | SMALL | ZEROPAD, | |
606 | }; | |
4da0b66c BH |
607 | static const struct printf_spec mem_spec = { |
608 | .base = 16, | |
609 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
610 | .precision = -1, | |
611 | .flags = SPECIAL | SMALL | ZEROPAD, | |
612 | }; | |
0f4050c7 BH |
613 | static const struct printf_spec bus_spec = { |
614 | .base = 16, | |
615 | .field_width = 2, | |
616 | .precision = -1, | |
617 | .flags = SMALL | ZEROPAD, | |
618 | }; | |
4da0b66c | 619 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
620 | .base = 10, |
621 | .precision = -1, | |
622 | .flags = 0, | |
623 | }; | |
4da0b66c | 624 | static const struct printf_spec str_spec = { |
fd95541e BH |
625 | .field_width = -1, |
626 | .precision = 10, | |
627 | .flags = LEFT, | |
628 | }; | |
4da0b66c | 629 | static const struct printf_spec flag_spec = { |
fd95541e BH |
630 | .base = 16, |
631 | .precision = -1, | |
632 | .flags = SPECIAL | SMALL, | |
633 | }; | |
c7dabef8 BH |
634 | |
635 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
636 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
637 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
638 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 639 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
640 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
641 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
642 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
643 | ||
332d2e78 | 644 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 645 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 646 | const struct printf_spec *specp; |
332d2e78 LT |
647 | |
648 | *p++ = '['; | |
4da0b66c | 649 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 650 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
651 | specp = &io_spec; |
652 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 653 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
654 | specp = &mem_spec; |
655 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 656 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
657 | specp = &dec_spec; |
658 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 659 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 660 | specp = &dec_spec; |
0f4050c7 BH |
661 | } else if (res->flags & IORESOURCE_BUS) { |
662 | p = string(p, pend, "bus ", str_spec); | |
663 | specp = &bus_spec; | |
4da0b66c | 664 | } else { |
c7dabef8 | 665 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 666 | specp = &mem_spec; |
c7dabef8 | 667 | decode = 0; |
fd95541e | 668 | } |
4da0b66c | 669 | p = number(p, pend, res->start, *specp); |
c91d3376 BH |
670 | if (res->start != res->end) { |
671 | *p++ = '-'; | |
4da0b66c | 672 | p = number(p, pend, res->end, *specp); |
c91d3376 | 673 | } |
c7dabef8 | 674 | if (decode) { |
fd95541e BH |
675 | if (res->flags & IORESOURCE_MEM_64) |
676 | p = string(p, pend, " 64bit", str_spec); | |
677 | if (res->flags & IORESOURCE_PREFETCH) | |
678 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
679 | if (res->flags & IORESOURCE_WINDOW) |
680 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
681 | if (res->flags & IORESOURCE_DISABLED) |
682 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
683 | } else { |
684 | p = string(p, pend, " flags ", str_spec); | |
685 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 686 | } |
332d2e78 | 687 | *p++ = ']'; |
c7dabef8 | 688 | *p = '\0'; |
332d2e78 | 689 | |
fef20d9c | 690 | return string(buf, end, sym, spec); |
332d2e78 LT |
691 | } |
692 | ||
fef20d9c | 693 | static char *mac_address_string(char *buf, char *end, u8 *addr, |
8a27f7c9 | 694 | struct printf_spec spec, const char *fmt) |
dd45c9cf | 695 | { |
8a27f7c9 | 696 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
697 | char *p = mac_addr; |
698 | int i; | |
bc7259a2 JP |
699 | char separator; |
700 | ||
701 | if (fmt[1] == 'F') { /* FDDI canonical format */ | |
bc7259a2 JP |
702 | separator = '-'; |
703 | } else { | |
bc7259a2 JP |
704 | separator = ':'; |
705 | } | |
dd45c9cf HH |
706 | |
707 | for (i = 0; i < 6; i++) { | |
c8e00060 | 708 | p = pack_hex_byte(p, addr[i]); |
8a27f7c9 | 709 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 710 | *p++ = separator; |
dd45c9cf HH |
711 | } |
712 | *p = '\0'; | |
713 | ||
fef20d9c | 714 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
715 | } |
716 | ||
0159f24e | 717 | static char *ip4_string(char *p, const u8 *addr, const char *fmt) |
8a27f7c9 JP |
718 | { |
719 | int i; | |
0159f24e JP |
720 | bool leading_zeros = (fmt[0] == 'i'); |
721 | int index; | |
722 | int step; | |
723 | ||
724 | switch (fmt[2]) { | |
725 | case 'h': | |
726 | #ifdef __BIG_ENDIAN | |
727 | index = 0; | |
728 | step = 1; | |
729 | #else | |
730 | index = 3; | |
731 | step = -1; | |
732 | #endif | |
733 | break; | |
734 | case 'l': | |
735 | index = 3; | |
736 | step = -1; | |
737 | break; | |
738 | case 'n': | |
739 | case 'b': | |
740 | default: | |
741 | index = 0; | |
742 | step = 1; | |
743 | break; | |
744 | } | |
8a27f7c9 JP |
745 | for (i = 0; i < 4; i++) { |
746 | char temp[3]; /* hold each IP quad in reverse order */ | |
0159f24e | 747 | int digits = put_dec_trunc(temp, addr[index]) - temp; |
8a27f7c9 JP |
748 | if (leading_zeros) { |
749 | if (digits < 3) | |
750 | *p++ = '0'; | |
751 | if (digits < 2) | |
752 | *p++ = '0'; | |
753 | } | |
754 | /* reverse the digits in the quad */ | |
755 | while (digits--) | |
756 | *p++ = temp[digits]; | |
757 | if (i < 3) | |
758 | *p++ = '.'; | |
0159f24e | 759 | index += step; |
8a27f7c9 | 760 | } |
8a27f7c9 | 761 | *p = '\0'; |
7b9186f5 | 762 | |
8a27f7c9 JP |
763 | return p; |
764 | } | |
765 | ||
eb78cd26 | 766 | static char *ip6_compressed_string(char *p, const char *addr) |
689afa7d | 767 | { |
7b9186f5 | 768 | int i, j, range; |
8a27f7c9 JP |
769 | unsigned char zerolength[8]; |
770 | int longest = 1; | |
771 | int colonpos = -1; | |
772 | u16 word; | |
7b9186f5 | 773 | u8 hi, lo; |
8a27f7c9 | 774 | bool needcolon = false; |
eb78cd26 JP |
775 | bool useIPv4; |
776 | struct in6_addr in6; | |
777 | ||
778 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
779 | ||
780 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
781 | |
782 | memset(zerolength, 0, sizeof(zerolength)); | |
783 | ||
784 | if (useIPv4) | |
785 | range = 6; | |
786 | else | |
787 | range = 8; | |
788 | ||
789 | /* find position of longest 0 run */ | |
790 | for (i = 0; i < range; i++) { | |
791 | for (j = i; j < range; j++) { | |
eb78cd26 | 792 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
793 | break; |
794 | zerolength[i]++; | |
795 | } | |
796 | } | |
797 | for (i = 0; i < range; i++) { | |
798 | if (zerolength[i] > longest) { | |
799 | longest = zerolength[i]; | |
800 | colonpos = i; | |
801 | } | |
802 | } | |
689afa7d | 803 | |
8a27f7c9 JP |
804 | /* emit address */ |
805 | for (i = 0; i < range; i++) { | |
806 | if (i == colonpos) { | |
807 | if (needcolon || i == 0) | |
808 | *p++ = ':'; | |
809 | *p++ = ':'; | |
810 | needcolon = false; | |
811 | i += longest - 1; | |
812 | continue; | |
813 | } | |
814 | if (needcolon) { | |
815 | *p++ = ':'; | |
816 | needcolon = false; | |
817 | } | |
818 | /* hex u16 without leading 0s */ | |
eb78cd26 | 819 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
820 | hi = word >> 8; |
821 | lo = word & 0xff; | |
822 | if (hi) { | |
823 | if (hi > 0x0f) | |
824 | p = pack_hex_byte(p, hi); | |
825 | else | |
826 | *p++ = hex_asc_lo(hi); | |
b5ff992b | 827 | p = pack_hex_byte(p, lo); |
8a27f7c9 | 828 | } |
b5ff992b | 829 | else if (lo > 0x0f) |
8a27f7c9 JP |
830 | p = pack_hex_byte(p, lo); |
831 | else | |
832 | *p++ = hex_asc_lo(lo); | |
833 | needcolon = true; | |
834 | } | |
835 | ||
836 | if (useIPv4) { | |
837 | if (needcolon) | |
838 | *p++ = ':'; | |
0159f24e | 839 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 840 | } |
8a27f7c9 | 841 | *p = '\0'; |
7b9186f5 | 842 | |
8a27f7c9 JP |
843 | return p; |
844 | } | |
845 | ||
eb78cd26 | 846 | static char *ip6_string(char *p, const char *addr, const char *fmt) |
8a27f7c9 JP |
847 | { |
848 | int i; | |
7b9186f5 | 849 | |
689afa7d | 850 | for (i = 0; i < 8; i++) { |
eb78cd26 JP |
851 | p = pack_hex_byte(p, *addr++); |
852 | p = pack_hex_byte(p, *addr++); | |
8a27f7c9 | 853 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
854 | *p++ = ':'; |
855 | } | |
856 | *p = '\0'; | |
7b9186f5 | 857 | |
8a27f7c9 JP |
858 | return p; |
859 | } | |
860 | ||
861 | static char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
862 | struct printf_spec spec, const char *fmt) | |
863 | { | |
864 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
865 | ||
866 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 867 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 868 | else |
eb78cd26 | 869 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 870 | |
fef20d9c | 871 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
872 | } |
873 | ||
8a27f7c9 JP |
874 | static char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
875 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 876 | { |
8a27f7c9 | 877 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 878 | |
0159f24e | 879 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 880 | |
fef20d9c | 881 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
882 | } |
883 | ||
9ac6e44e JP |
884 | static char *uuid_string(char *buf, char *end, const u8 *addr, |
885 | struct printf_spec spec, const char *fmt) | |
886 | { | |
887 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
888 | char *p = uuid; | |
889 | int i; | |
890 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
891 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
892 | const u8 *index = be; | |
893 | bool uc = false; | |
894 | ||
895 | switch (*(++fmt)) { | |
896 | case 'L': | |
897 | uc = true; /* fall-through */ | |
898 | case 'l': | |
899 | index = le; | |
900 | break; | |
901 | case 'B': | |
902 | uc = true; | |
903 | break; | |
904 | } | |
905 | ||
906 | for (i = 0; i < 16; i++) { | |
907 | p = pack_hex_byte(p, addr[index[i]]); | |
908 | switch (i) { | |
909 | case 3: | |
910 | case 5: | |
911 | case 7: | |
912 | case 9: | |
913 | *p++ = '-'; | |
914 | break; | |
915 | } | |
916 | } | |
917 | ||
918 | *p = 0; | |
919 | ||
920 | if (uc) { | |
921 | p = uuid; | |
922 | do { | |
923 | *p = toupper(*p); | |
924 | } while (*(++p)); | |
925 | } | |
926 | ||
927 | return string(buf, end, uuid, spec); | |
928 | } | |
929 | ||
4d8a743c LT |
930 | /* |
931 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
932 | * by an extra set of alphanumeric characters that are extended format | |
933 | * specifiers. | |
934 | * | |
332d2e78 LT |
935 | * Right now we handle: |
936 | * | |
0c8b946e FW |
937 | * - 'F' For symbolic function descriptor pointers with offset |
938 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
939 | * - 'S' For symbolic direct pointers with offset |
940 | * - 's' For symbolic direct pointers without offset | |
c7dabef8 BH |
941 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
942 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dd45c9cf HH |
943 | * - 'M' For a 6-byte MAC address, it prints the address in the |
944 | * usual colon-separated hex notation | |
8a27f7c9 | 945 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 946 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 947 | * with a dash-separated hex notation |
8a27f7c9 JP |
948 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
949 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
950 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
951 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
952 | * IPv6 omits the colons (01020304...0f) | |
953 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
0159f24e | 954 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order |
8a27f7c9 | 955 | * - 'I6c' for IPv6 addresses printed as specified by |
3f472402 | 956 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
9ac6e44e JP |
957 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
958 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
959 | * Options for %pU are: | |
960 | * b big endian lower case hex (default) | |
961 | * B big endian UPPER case hex | |
962 | * l little endian lower case hex | |
963 | * L little endian UPPER case hex | |
964 | * big endian output byte order is: | |
965 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
966 | * little endian output byte order is: | |
967 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
968 | * | |
332d2e78 LT |
969 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
970 | * function pointers are really function descriptors, which contain a | |
971 | * pointer to the real address. | |
4d8a743c | 972 | */ |
fef20d9c FW |
973 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
974 | struct printf_spec spec) | |
78a8bf69 | 975 | { |
d97106ab | 976 | if (!ptr) |
fef20d9c | 977 | return string(buf, end, "(null)", spec); |
d97106ab | 978 | |
0fe1ef24 LT |
979 | switch (*fmt) { |
980 | case 'F': | |
0c8b946e | 981 | case 'f': |
0fe1ef24 LT |
982 | ptr = dereference_function_descriptor(ptr); |
983 | /* Fallthrough */ | |
984 | case 'S': | |
9ac6e44e | 985 | case 's': |
0c8b946e | 986 | return symbol_string(buf, end, ptr, spec, *fmt); |
332d2e78 | 987 | case 'R': |
c7dabef8 | 988 | case 'r': |
fd95541e | 989 | return resource_string(buf, end, ptr, spec, fmt); |
8a27f7c9 JP |
990 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
991 | case 'm': /* Contiguous: 000102030405 */ | |
bc7259a2 | 992 | /* [mM]F (FDDI, bit reversed) */ |
8a27f7c9 JP |
993 | return mac_address_string(buf, end, ptr, spec, fmt); |
994 | case 'I': /* Formatted IP supported | |
995 | * 4: 1.2.3.4 | |
996 | * 6: 0001:0203:...:0708 | |
997 | * 6c: 1::708 or 1::1.2.3.4 | |
998 | */ | |
999 | case 'i': /* Contiguous: | |
1000 | * 4: 001.002.003.004 | |
1001 | * 6: 000102...0f | |
1002 | */ | |
1003 | switch (fmt[1]) { | |
1004 | case '6': | |
1005 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1006 | case '4': | |
1007 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1008 | } | |
fef20d9c | 1009 | break; |
9ac6e44e JP |
1010 | case 'U': |
1011 | return uuid_string(buf, end, ptr, spec, fmt); | |
fef20d9c FW |
1012 | } |
1013 | spec.flags |= SMALL; | |
1014 | if (spec.field_width == -1) { | |
1015 | spec.field_width = 2*sizeof(void *); | |
1016 | spec.flags |= ZEROPAD; | |
1017 | } | |
1018 | spec.base = 16; | |
1019 | ||
1020 | return number(buf, end, (unsigned long) ptr, spec); | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * Helper function to decode printf style format. | |
1025 | * Each call decode a token from the format and return the | |
1026 | * number of characters read (or likely the delta where it wants | |
1027 | * to go on the next call). | |
1028 | * The decoded token is returned through the parameters | |
1029 | * | |
1030 | * 'h', 'l', or 'L' for integer fields | |
1031 | * 'z' support added 23/7/1999 S.H. | |
1032 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1033 | * 't' added for ptrdiff_t | |
1034 | * | |
1035 | * @fmt: the format string | |
1036 | * @type of the token returned | |
1037 | * @flags: various flags such as +, -, # tokens.. | |
1038 | * @field_width: overwritten width | |
1039 | * @base: base of the number (octal, hex, ...) | |
1040 | * @precision: precision of a number | |
1041 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1042 | */ | |
1043 | static int format_decode(const char *fmt, struct printf_spec *spec) | |
1044 | { | |
1045 | const char *start = fmt; | |
fef20d9c FW |
1046 | |
1047 | /* we finished early by reading the field width */ | |
ed681a91 | 1048 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1049 | if (spec->field_width < 0) { |
1050 | spec->field_width = -spec->field_width; | |
1051 | spec->flags |= LEFT; | |
1052 | } | |
1053 | spec->type = FORMAT_TYPE_NONE; | |
1054 | goto precision; | |
1055 | } | |
1056 | ||
1057 | /* we finished early by reading the precision */ | |
1058 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1059 | if (spec->precision < 0) | |
1060 | spec->precision = 0; | |
1061 | ||
1062 | spec->type = FORMAT_TYPE_NONE; | |
1063 | goto qualifier; | |
1064 | } | |
1065 | ||
1066 | /* By default */ | |
1067 | spec->type = FORMAT_TYPE_NONE; | |
1068 | ||
1069 | for (; *fmt ; ++fmt) { | |
1070 | if (*fmt == '%') | |
1071 | break; | |
1072 | } | |
1073 | ||
1074 | /* Return the current non-format string */ | |
1075 | if (fmt != start || !*fmt) | |
1076 | return fmt - start; | |
1077 | ||
1078 | /* Process flags */ | |
1079 | spec->flags = 0; | |
1080 | ||
1081 | while (1) { /* this also skips first '%' */ | |
1082 | bool found = true; | |
1083 | ||
1084 | ++fmt; | |
1085 | ||
1086 | switch (*fmt) { | |
1087 | case '-': spec->flags |= LEFT; break; | |
1088 | case '+': spec->flags |= PLUS; break; | |
1089 | case ' ': spec->flags |= SPACE; break; | |
1090 | case '#': spec->flags |= SPECIAL; break; | |
1091 | case '0': spec->flags |= ZEROPAD; break; | |
1092 | default: found = false; | |
1093 | } | |
1094 | ||
1095 | if (!found) | |
1096 | break; | |
1097 | } | |
1098 | ||
1099 | /* get field width */ | |
1100 | spec->field_width = -1; | |
1101 | ||
1102 | if (isdigit(*fmt)) | |
1103 | spec->field_width = skip_atoi(&fmt); | |
1104 | else if (*fmt == '*') { | |
1105 | /* it's the next argument */ | |
ed681a91 | 1106 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1107 | return ++fmt - start; |
1108 | } | |
1109 | ||
1110 | precision: | |
1111 | /* get the precision */ | |
1112 | spec->precision = -1; | |
1113 | if (*fmt == '.') { | |
1114 | ++fmt; | |
1115 | if (isdigit(*fmt)) { | |
1116 | spec->precision = skip_atoi(&fmt); | |
1117 | if (spec->precision < 0) | |
1118 | spec->precision = 0; | |
1119 | } else if (*fmt == '*') { | |
1120 | /* it's the next argument */ | |
adf26f84 | 1121 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1122 | return ++fmt - start; |
1123 | } | |
1124 | } | |
1125 | ||
1126 | qualifier: | |
1127 | /* get the conversion qualifier */ | |
1128 | spec->qualifier = -1; | |
08562cb2 AGR |
1129 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1130 | TOLOWER(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1131 | spec->qualifier = *fmt++; |
1132 | if (unlikely(spec->qualifier == *fmt)) { | |
1133 | if (spec->qualifier == 'l') { | |
1134 | spec->qualifier = 'L'; | |
1135 | ++fmt; | |
1136 | } else if (spec->qualifier == 'h') { | |
1137 | spec->qualifier = 'H'; | |
1138 | ++fmt; | |
1139 | } | |
fef20d9c FW |
1140 | } |
1141 | } | |
1142 | ||
1143 | /* default base */ | |
1144 | spec->base = 10; | |
1145 | switch (*fmt) { | |
1146 | case 'c': | |
1147 | spec->type = FORMAT_TYPE_CHAR; | |
1148 | return ++fmt - start; | |
1149 | ||
1150 | case 's': | |
1151 | spec->type = FORMAT_TYPE_STR; | |
1152 | return ++fmt - start; | |
1153 | ||
1154 | case 'p': | |
1155 | spec->type = FORMAT_TYPE_PTR; | |
1156 | return fmt - start; | |
1157 | /* skip alnum */ | |
1158 | ||
1159 | case 'n': | |
1160 | spec->type = FORMAT_TYPE_NRCHARS; | |
1161 | return ++fmt - start; | |
1162 | ||
1163 | case '%': | |
1164 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1165 | return ++fmt - start; | |
1166 | ||
1167 | /* integer number formats - set up the flags and "break" */ | |
1168 | case 'o': | |
1169 | spec->base = 8; | |
1170 | break; | |
1171 | ||
1172 | case 'x': | |
1173 | spec->flags |= SMALL; | |
1174 | ||
1175 | case 'X': | |
1176 | spec->base = 16; | |
1177 | break; | |
1178 | ||
1179 | case 'd': | |
1180 | case 'i': | |
39e874f8 | 1181 | spec->flags |= SIGN; |
fef20d9c | 1182 | case 'u': |
4aa99606 | 1183 | break; |
fef20d9c FW |
1184 | |
1185 | default: | |
1186 | spec->type = FORMAT_TYPE_INVALID; | |
1187 | return fmt - start; | |
0fe1ef24 | 1188 | } |
fef20d9c FW |
1189 | |
1190 | if (spec->qualifier == 'L') | |
1191 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1192 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1193 | if (spec->flags & SIGN) |
fef20d9c FW |
1194 | spec->type = FORMAT_TYPE_LONG; |
1195 | else | |
1196 | spec->type = FORMAT_TYPE_ULONG; | |
08562cb2 | 1197 | } else if (TOLOWER(spec->qualifier) == 'z') { |
fef20d9c FW |
1198 | spec->type = FORMAT_TYPE_SIZE_T; |
1199 | } else if (spec->qualifier == 't') { | |
1200 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1201 | } else if (spec->qualifier == 'H') { |
1202 | if (spec->flags & SIGN) | |
1203 | spec->type = FORMAT_TYPE_BYTE; | |
1204 | else | |
1205 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1206 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1207 | if (spec->flags & SIGN) |
fef20d9c FW |
1208 | spec->type = FORMAT_TYPE_SHORT; |
1209 | else | |
1210 | spec->type = FORMAT_TYPE_USHORT; | |
1211 | } else { | |
39e874f8 | 1212 | if (spec->flags & SIGN) |
fef20d9c FW |
1213 | spec->type = FORMAT_TYPE_INT; |
1214 | else | |
1215 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1216 | } |
fef20d9c FW |
1217 | |
1218 | return ++fmt - start; | |
78a8bf69 LT |
1219 | } |
1220 | ||
1da177e4 LT |
1221 | /** |
1222 | * vsnprintf - Format a string and place it in a buffer | |
1223 | * @buf: The buffer to place the result into | |
1224 | * @size: The size of the buffer, including the trailing null space | |
1225 | * @fmt: The format string to use | |
1226 | * @args: Arguments for the format string | |
1227 | * | |
20036fdc | 1228 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1229 | * %pS output the name of a text symbol with offset |
1230 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1231 | * %pF output the name of a function pointer with its offset |
1232 | * %pf output the name of a function pointer without its offset | |
8a79503a UKK |
1233 | * %pR output the address range in a struct resource with decoded flags |
1234 | * %pr output the address range in a struct resource with raw flags | |
1235 | * %pM output a 6-byte MAC address with colons | |
1236 | * %pm output a 6-byte MAC address without colons | |
1237 | * %pI4 print an IPv4 address without leading zeros | |
1238 | * %pi4 print an IPv4 address with leading zeros | |
1239 | * %pI6 print an IPv6 address with colons | |
1240 | * %pi6 print an IPv6 address without colons | |
1241 | * %pI6c print an IPv6 address as specified by | |
3f472402 | 1242 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
8a79503a UKK |
1243 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1244 | * case. | |
0efb4d20 | 1245 | * %n is ignored |
20036fdc | 1246 | * |
1da177e4 LT |
1247 | * The return value is the number of characters which would |
1248 | * be generated for the given input, excluding the trailing | |
1249 | * '\0', as per ISO C99. If you want to have the exact | |
1250 | * number of characters written into @buf as return value | |
72fd4a35 | 1251 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1252 | * return is greater than or equal to @size, the resulting |
1253 | * string is truncated. | |
1254 | * | |
1255 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1256 | * You probably want snprintf() instead. |
1da177e4 LT |
1257 | */ |
1258 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1259 | { | |
1da177e4 | 1260 | unsigned long long num; |
d4be151b | 1261 | char *str, *end; |
fef20d9c | 1262 | struct printf_spec spec = {0}; |
1da177e4 | 1263 | |
f796937a JF |
1264 | /* Reject out-of-range values early. Large positive sizes are |
1265 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1266 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1267 | return 0; |
1da177e4 LT |
1268 | |
1269 | str = buf; | |
f796937a | 1270 | end = buf + size; |
1da177e4 | 1271 | |
f796937a JF |
1272 | /* Make sure end is always >= buf */ |
1273 | if (end < buf) { | |
1274 | end = ((void *)-1); | |
1275 | size = end - buf; | |
1da177e4 LT |
1276 | } |
1277 | ||
fef20d9c FW |
1278 | while (*fmt) { |
1279 | const char *old_fmt = fmt; | |
d4be151b | 1280 | int read = format_decode(fmt, &spec); |
1da177e4 | 1281 | |
fef20d9c | 1282 | fmt += read; |
1da177e4 | 1283 | |
fef20d9c FW |
1284 | switch (spec.type) { |
1285 | case FORMAT_TYPE_NONE: { | |
1286 | int copy = read; | |
1287 | if (str < end) { | |
1288 | if (copy > end - str) | |
1289 | copy = end - str; | |
1290 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1291 | } |
fef20d9c FW |
1292 | str += read; |
1293 | break; | |
1da177e4 LT |
1294 | } |
1295 | ||
ed681a91 | 1296 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1297 | spec.field_width = va_arg(args, int); |
1298 | break; | |
1da177e4 | 1299 | |
fef20d9c FW |
1300 | case FORMAT_TYPE_PRECISION: |
1301 | spec.precision = va_arg(args, int); | |
1302 | break; | |
1da177e4 | 1303 | |
d4be151b AGR |
1304 | case FORMAT_TYPE_CHAR: { |
1305 | char c; | |
1306 | ||
fef20d9c FW |
1307 | if (!(spec.flags & LEFT)) { |
1308 | while (--spec.field_width > 0) { | |
f796937a | 1309 | if (str < end) |
1da177e4 LT |
1310 | *str = ' '; |
1311 | ++str; | |
1da177e4 | 1312 | |
fef20d9c FW |
1313 | } |
1314 | } | |
1315 | c = (unsigned char) va_arg(args, int); | |
1316 | if (str < end) | |
1317 | *str = c; | |
1318 | ++str; | |
1319 | while (--spec.field_width > 0) { | |
f796937a | 1320 | if (str < end) |
fef20d9c | 1321 | *str = ' '; |
1da177e4 | 1322 | ++str; |
fef20d9c FW |
1323 | } |
1324 | break; | |
d4be151b | 1325 | } |
1da177e4 | 1326 | |
fef20d9c FW |
1327 | case FORMAT_TYPE_STR: |
1328 | str = string(str, end, va_arg(args, char *), spec); | |
1329 | break; | |
1da177e4 | 1330 | |
fef20d9c FW |
1331 | case FORMAT_TYPE_PTR: |
1332 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1333 | spec); | |
1334 | while (isalnum(*fmt)) | |
1335 | fmt++; | |
1336 | break; | |
1da177e4 | 1337 | |
fef20d9c FW |
1338 | case FORMAT_TYPE_PERCENT_CHAR: |
1339 | if (str < end) | |
1340 | *str = '%'; | |
1341 | ++str; | |
1342 | break; | |
1da177e4 | 1343 | |
fef20d9c FW |
1344 | case FORMAT_TYPE_INVALID: |
1345 | if (str < end) | |
1346 | *str = '%'; | |
1347 | ++str; | |
fef20d9c FW |
1348 | break; |
1349 | ||
1350 | case FORMAT_TYPE_NRCHARS: { | |
ef0658f3 | 1351 | u8 qualifier = spec.qualifier; |
fef20d9c FW |
1352 | |
1353 | if (qualifier == 'l') { | |
1354 | long *ip = va_arg(args, long *); | |
1355 | *ip = (str - buf); | |
08562cb2 | 1356 | } else if (TOLOWER(qualifier) == 'z') { |
fef20d9c FW |
1357 | size_t *ip = va_arg(args, size_t *); |
1358 | *ip = (str - buf); | |
1359 | } else { | |
1360 | int *ip = va_arg(args, int *); | |
1361 | *ip = (str - buf); | |
1362 | } | |
1363 | break; | |
1da177e4 | 1364 | } |
fef20d9c FW |
1365 | |
1366 | default: | |
1367 | switch (spec.type) { | |
1368 | case FORMAT_TYPE_LONG_LONG: | |
1369 | num = va_arg(args, long long); | |
1370 | break; | |
1371 | case FORMAT_TYPE_ULONG: | |
1372 | num = va_arg(args, unsigned long); | |
1373 | break; | |
1374 | case FORMAT_TYPE_LONG: | |
1375 | num = va_arg(args, long); | |
1376 | break; | |
1377 | case FORMAT_TYPE_SIZE_T: | |
1378 | num = va_arg(args, size_t); | |
1379 | break; | |
1380 | case FORMAT_TYPE_PTRDIFF: | |
1381 | num = va_arg(args, ptrdiff_t); | |
1382 | break; | |
a4e94ef0 Z |
1383 | case FORMAT_TYPE_UBYTE: |
1384 | num = (unsigned char) va_arg(args, int); | |
1385 | break; | |
1386 | case FORMAT_TYPE_BYTE: | |
1387 | num = (signed char) va_arg(args, int); | |
1388 | break; | |
fef20d9c FW |
1389 | case FORMAT_TYPE_USHORT: |
1390 | num = (unsigned short) va_arg(args, int); | |
1391 | break; | |
1392 | case FORMAT_TYPE_SHORT: | |
1393 | num = (short) va_arg(args, int); | |
1394 | break; | |
39e874f8 FW |
1395 | case FORMAT_TYPE_INT: |
1396 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1397 | break; |
1398 | default: | |
1399 | num = va_arg(args, unsigned int); | |
1400 | } | |
1401 | ||
1402 | str = number(str, end, num, spec); | |
1da177e4 | 1403 | } |
1da177e4 | 1404 | } |
fef20d9c | 1405 | |
f796937a JF |
1406 | if (size > 0) { |
1407 | if (str < end) | |
1408 | *str = '\0'; | |
1409 | else | |
0a6047ee | 1410 | end[-1] = '\0'; |
f796937a | 1411 | } |
fef20d9c | 1412 | |
f796937a | 1413 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1414 | return str-buf; |
fef20d9c | 1415 | |
1da177e4 | 1416 | } |
1da177e4 LT |
1417 | EXPORT_SYMBOL(vsnprintf); |
1418 | ||
1419 | /** | |
1420 | * vscnprintf - Format a string and place it in a buffer | |
1421 | * @buf: The buffer to place the result into | |
1422 | * @size: The size of the buffer, including the trailing null space | |
1423 | * @fmt: The format string to use | |
1424 | * @args: Arguments for the format string | |
1425 | * | |
1426 | * The return value is the number of characters which have been written into | |
1427 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
1428 | * returns 0. | |
1429 | * | |
1430 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1431 | * You probably want scnprintf() instead. |
20036fdc AK |
1432 | * |
1433 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1434 | */ |
1435 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1436 | { | |
1437 | int i; | |
1438 | ||
7b9186f5 AGR |
1439 | i = vsnprintf(buf, size, fmt, args); |
1440 | ||
1da177e4 LT |
1441 | return (i >= size) ? (size - 1) : i; |
1442 | } | |
1da177e4 LT |
1443 | EXPORT_SYMBOL(vscnprintf); |
1444 | ||
1445 | /** | |
1446 | * snprintf - Format a string and place it in a buffer | |
1447 | * @buf: The buffer to place the result into | |
1448 | * @size: The size of the buffer, including the trailing null space | |
1449 | * @fmt: The format string to use | |
1450 | * @...: Arguments for the format string | |
1451 | * | |
1452 | * The return value is the number of characters which would be | |
1453 | * generated for the given input, excluding the trailing null, | |
1454 | * as per ISO C99. If the return is greater than or equal to | |
1455 | * @size, the resulting string is truncated. | |
20036fdc AK |
1456 | * |
1457 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1458 | */ |
7b9186f5 | 1459 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1460 | { |
1461 | va_list args; | |
1462 | int i; | |
1463 | ||
1464 | va_start(args, fmt); | |
7b9186f5 | 1465 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1466 | va_end(args); |
7b9186f5 | 1467 | |
1da177e4 LT |
1468 | return i; |
1469 | } | |
1da177e4 LT |
1470 | EXPORT_SYMBOL(snprintf); |
1471 | ||
1472 | /** | |
1473 | * scnprintf - Format a string and place it in a buffer | |
1474 | * @buf: The buffer to place the result into | |
1475 | * @size: The size of the buffer, including the trailing null space | |
1476 | * @fmt: The format string to use | |
1477 | * @...: Arguments for the format string | |
1478 | * | |
1479 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 1480 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
1481 | */ |
1482 | ||
7b9186f5 | 1483 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1484 | { |
1485 | va_list args; | |
1486 | int i; | |
1487 | ||
1488 | va_start(args, fmt); | |
1489 | i = vsnprintf(buf, size, fmt, args); | |
1490 | va_end(args); | |
7b9186f5 | 1491 | |
1da177e4 LT |
1492 | return (i >= size) ? (size - 1) : i; |
1493 | } | |
1494 | EXPORT_SYMBOL(scnprintf); | |
1495 | ||
1496 | /** | |
1497 | * vsprintf - Format a string and place it in a buffer | |
1498 | * @buf: The buffer to place the result into | |
1499 | * @fmt: The format string to use | |
1500 | * @args: Arguments for the format string | |
1501 | * | |
1502 | * The function returns the number of characters written | |
72fd4a35 | 1503 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1504 | * buffer overflows. |
1505 | * | |
1506 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1507 | * You probably want sprintf() instead. |
20036fdc AK |
1508 | * |
1509 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1510 | */ |
1511 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1512 | { | |
1513 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1514 | } | |
1da177e4 LT |
1515 | EXPORT_SYMBOL(vsprintf); |
1516 | ||
1517 | /** | |
1518 | * sprintf - Format a string and place it in a buffer | |
1519 | * @buf: The buffer to place the result into | |
1520 | * @fmt: The format string to use | |
1521 | * @...: Arguments for the format string | |
1522 | * | |
1523 | * The function returns the number of characters written | |
72fd4a35 | 1524 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1525 | * buffer overflows. |
20036fdc AK |
1526 | * |
1527 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1528 | */ |
7b9186f5 | 1529 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
1530 | { |
1531 | va_list args; | |
1532 | int i; | |
1533 | ||
1534 | va_start(args, fmt); | |
7b9186f5 | 1535 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 1536 | va_end(args); |
7b9186f5 | 1537 | |
1da177e4 LT |
1538 | return i; |
1539 | } | |
1da177e4 LT |
1540 | EXPORT_SYMBOL(sprintf); |
1541 | ||
4370aa4a LJ |
1542 | #ifdef CONFIG_BINARY_PRINTF |
1543 | /* | |
1544 | * bprintf service: | |
1545 | * vbin_printf() - VA arguments to binary data | |
1546 | * bstr_printf() - Binary data to text string | |
1547 | */ | |
1548 | ||
1549 | /** | |
1550 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1551 | * @bin_buf: The buffer to place args' binary value | |
1552 | * @size: The size of the buffer(by words(32bits), not characters) | |
1553 | * @fmt: The format string to use | |
1554 | * @args: Arguments for the format string | |
1555 | * | |
1556 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1557 | * is skiped. | |
1558 | * | |
1559 | * The return value is the number of words(32bits) which would be generated for | |
1560 | * the given input. | |
1561 | * | |
1562 | * NOTE: | |
1563 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1564 | * valid for bstr_printf(). | |
1565 | */ | |
1566 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1567 | { | |
fef20d9c | 1568 | struct printf_spec spec = {0}; |
4370aa4a | 1569 | char *str, *end; |
4370aa4a LJ |
1570 | |
1571 | str = (char *)bin_buf; | |
1572 | end = (char *)(bin_buf + size); | |
1573 | ||
1574 | #define save_arg(type) \ | |
1575 | do { \ | |
1576 | if (sizeof(type) == 8) { \ | |
1577 | unsigned long long value; \ | |
1578 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1579 | value = va_arg(args, unsigned long long); \ | |
1580 | if (str + sizeof(type) <= end) { \ | |
1581 | *(u32 *)str = *(u32 *)&value; \ | |
1582 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1583 | } \ | |
1584 | } else { \ | |
1585 | unsigned long value; \ | |
1586 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1587 | value = va_arg(args, int); \ | |
1588 | if (str + sizeof(type) <= end) \ | |
1589 | *(typeof(type) *)str = (type)value; \ | |
1590 | } \ | |
1591 | str += sizeof(type); \ | |
1592 | } while (0) | |
1593 | ||
fef20d9c | 1594 | while (*fmt) { |
d4be151b | 1595 | int read = format_decode(fmt, &spec); |
4370aa4a | 1596 | |
fef20d9c | 1597 | fmt += read; |
4370aa4a | 1598 | |
fef20d9c FW |
1599 | switch (spec.type) { |
1600 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
1601 | case FORMAT_TYPE_INVALID: |
1602 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
1603 | break; |
1604 | ||
ed681a91 | 1605 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1606 | case FORMAT_TYPE_PRECISION: |
1607 | save_arg(int); | |
1608 | break; | |
1609 | ||
1610 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1611 | save_arg(char); |
fef20d9c FW |
1612 | break; |
1613 | ||
1614 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1615 | const char *save_str = va_arg(args, char *); |
1616 | size_t len; | |
6c356634 | 1617 | |
4370aa4a LJ |
1618 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1619 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 1620 | save_str = "(null)"; |
6c356634 AGR |
1621 | len = strlen(save_str) + 1; |
1622 | if (str + len < end) | |
1623 | memcpy(str, save_str, len); | |
1624 | str += len; | |
fef20d9c | 1625 | break; |
4370aa4a | 1626 | } |
fef20d9c FW |
1627 | |
1628 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1629 | save_arg(void *); |
1630 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1631 | while (isalnum(*fmt)) |
4370aa4a | 1632 | fmt++; |
fef20d9c FW |
1633 | break; |
1634 | ||
fef20d9c | 1635 | case FORMAT_TYPE_NRCHARS: { |
4370aa4a | 1636 | /* skip %n 's argument */ |
ef0658f3 | 1637 | u8 qualifier = spec.qualifier; |
4370aa4a LJ |
1638 | void *skip_arg; |
1639 | if (qualifier == 'l') | |
1640 | skip_arg = va_arg(args, long *); | |
08562cb2 | 1641 | else if (TOLOWER(qualifier) == 'z') |
4370aa4a LJ |
1642 | skip_arg = va_arg(args, size_t *); |
1643 | else | |
1644 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1645 | break; |
4370aa4a | 1646 | } |
fef20d9c FW |
1647 | |
1648 | default: | |
1649 | switch (spec.type) { | |
1650 | ||
1651 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1652 | save_arg(long long); |
fef20d9c FW |
1653 | break; |
1654 | case FORMAT_TYPE_ULONG: | |
1655 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1656 | save_arg(unsigned long); |
fef20d9c FW |
1657 | break; |
1658 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1659 | save_arg(size_t); |
fef20d9c FW |
1660 | break; |
1661 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 1662 | save_arg(ptrdiff_t); |
fef20d9c | 1663 | break; |
a4e94ef0 Z |
1664 | case FORMAT_TYPE_UBYTE: |
1665 | case FORMAT_TYPE_BYTE: | |
1666 | save_arg(char); | |
1667 | break; | |
fef20d9c FW |
1668 | case FORMAT_TYPE_USHORT: |
1669 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 1670 | save_arg(short); |
fef20d9c FW |
1671 | break; |
1672 | default: | |
4370aa4a | 1673 | save_arg(int); |
fef20d9c | 1674 | } |
4370aa4a LJ |
1675 | } |
1676 | } | |
fef20d9c | 1677 | |
7b9186f5 | 1678 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 1679 | #undef save_arg |
4370aa4a LJ |
1680 | } |
1681 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1682 | ||
1683 | /** | |
1684 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1685 | * @buf: The buffer to place the result into | |
1686 | * @size: The size of the buffer, including the trailing null space | |
1687 | * @fmt: The format string to use | |
1688 | * @bin_buf: Binary arguments for the format string | |
1689 | * | |
1690 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1691 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1692 | * a binary buffer that generated by vbin_printf. | |
1693 | * | |
1694 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 1695 | * see vsnprintf comment for details. |
4370aa4a LJ |
1696 | * |
1697 | * The return value is the number of characters which would | |
1698 | * be generated for the given input, excluding the trailing | |
1699 | * '\0', as per ISO C99. If you want to have the exact | |
1700 | * number of characters written into @buf as return value | |
1701 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1702 | * return is greater than or equal to @size, the resulting | |
1703 | * string is truncated. | |
1704 | */ | |
1705 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1706 | { | |
fef20d9c | 1707 | struct printf_spec spec = {0}; |
d4be151b AGR |
1708 | char *str, *end; |
1709 | const char *args = (const char *)bin_buf; | |
4370aa4a | 1710 | |
2f30b1f9 | 1711 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 1712 | return 0; |
4370aa4a LJ |
1713 | |
1714 | str = buf; | |
1715 | end = buf + size; | |
1716 | ||
1717 | #define get_arg(type) \ | |
1718 | ({ \ | |
1719 | typeof(type) value; \ | |
1720 | if (sizeof(type) == 8) { \ | |
1721 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1722 | *(u32 *)&value = *(u32 *)args; \ | |
1723 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1724 | } else { \ | |
1725 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1726 | value = *(typeof(type) *)args; \ | |
1727 | } \ | |
1728 | args += sizeof(type); \ | |
1729 | value; \ | |
1730 | }) | |
1731 | ||
1732 | /* Make sure end is always >= buf */ | |
1733 | if (end < buf) { | |
1734 | end = ((void *)-1); | |
1735 | size = end - buf; | |
1736 | } | |
1737 | ||
fef20d9c | 1738 | while (*fmt) { |
fef20d9c | 1739 | const char *old_fmt = fmt; |
d4be151b | 1740 | int read = format_decode(fmt, &spec); |
4370aa4a | 1741 | |
fef20d9c | 1742 | fmt += read; |
4370aa4a | 1743 | |
fef20d9c FW |
1744 | switch (spec.type) { |
1745 | case FORMAT_TYPE_NONE: { | |
1746 | int copy = read; | |
1747 | if (str < end) { | |
1748 | if (copy > end - str) | |
1749 | copy = end - str; | |
1750 | memcpy(str, old_fmt, copy); | |
4370aa4a | 1751 | } |
fef20d9c FW |
1752 | str += read; |
1753 | break; | |
4370aa4a LJ |
1754 | } |
1755 | ||
ed681a91 | 1756 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1757 | spec.field_width = get_arg(int); |
1758 | break; | |
4370aa4a | 1759 | |
fef20d9c FW |
1760 | case FORMAT_TYPE_PRECISION: |
1761 | spec.precision = get_arg(int); | |
1762 | break; | |
4370aa4a | 1763 | |
d4be151b AGR |
1764 | case FORMAT_TYPE_CHAR: { |
1765 | char c; | |
1766 | ||
fef20d9c FW |
1767 | if (!(spec.flags & LEFT)) { |
1768 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
1769 | if (str < end) |
1770 | *str = ' '; | |
1771 | ++str; | |
1772 | } | |
1773 | } | |
1774 | c = (unsigned char) get_arg(char); | |
1775 | if (str < end) | |
1776 | *str = c; | |
1777 | ++str; | |
fef20d9c | 1778 | while (--spec.field_width > 0) { |
4370aa4a LJ |
1779 | if (str < end) |
1780 | *str = ' '; | |
1781 | ++str; | |
1782 | } | |
fef20d9c | 1783 | break; |
d4be151b | 1784 | } |
4370aa4a | 1785 | |
fef20d9c | 1786 | case FORMAT_TYPE_STR: { |
4370aa4a | 1787 | const char *str_arg = args; |
d4be151b | 1788 | args += strlen(str_arg) + 1; |
fef20d9c FW |
1789 | str = string(str, end, (char *)str_arg, spec); |
1790 | break; | |
4370aa4a LJ |
1791 | } |
1792 | ||
fef20d9c FW |
1793 | case FORMAT_TYPE_PTR: |
1794 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1795 | while (isalnum(*fmt)) | |
4370aa4a | 1796 | fmt++; |
fef20d9c | 1797 | break; |
4370aa4a | 1798 | |
fef20d9c | 1799 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 1800 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
1801 | if (str < end) |
1802 | *str = '%'; | |
1803 | ++str; | |
fef20d9c FW |
1804 | break; |
1805 | ||
1806 | case FORMAT_TYPE_NRCHARS: | |
1807 | /* skip */ | |
1808 | break; | |
1809 | ||
d4be151b AGR |
1810 | default: { |
1811 | unsigned long long num; | |
1812 | ||
fef20d9c FW |
1813 | switch (spec.type) { |
1814 | ||
1815 | case FORMAT_TYPE_LONG_LONG: | |
1816 | num = get_arg(long long); | |
1817 | break; | |
1818 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
1819 | case FORMAT_TYPE_LONG: |
1820 | num = get_arg(unsigned long); | |
1821 | break; | |
1822 | case FORMAT_TYPE_SIZE_T: | |
1823 | num = get_arg(size_t); | |
1824 | break; | |
1825 | case FORMAT_TYPE_PTRDIFF: | |
1826 | num = get_arg(ptrdiff_t); | |
1827 | break; | |
a4e94ef0 Z |
1828 | case FORMAT_TYPE_UBYTE: |
1829 | num = get_arg(unsigned char); | |
1830 | break; | |
1831 | case FORMAT_TYPE_BYTE: | |
1832 | num = get_arg(signed char); | |
1833 | break; | |
fef20d9c FW |
1834 | case FORMAT_TYPE_USHORT: |
1835 | num = get_arg(unsigned short); | |
1836 | break; | |
1837 | case FORMAT_TYPE_SHORT: | |
1838 | num = get_arg(short); | |
1839 | break; | |
1840 | case FORMAT_TYPE_UINT: | |
1841 | num = get_arg(unsigned int); | |
1842 | break; | |
1843 | default: | |
1844 | num = get_arg(int); | |
1845 | } | |
1846 | ||
1847 | str = number(str, end, num, spec); | |
d4be151b AGR |
1848 | } /* default: */ |
1849 | } /* switch(spec.type) */ | |
1850 | } /* while(*fmt) */ | |
fef20d9c | 1851 | |
4370aa4a LJ |
1852 | if (size > 0) { |
1853 | if (str < end) | |
1854 | *str = '\0'; | |
1855 | else | |
1856 | end[-1] = '\0'; | |
1857 | } | |
fef20d9c | 1858 | |
4370aa4a LJ |
1859 | #undef get_arg |
1860 | ||
1861 | /* the trailing null byte doesn't count towards the total */ | |
1862 | return str - buf; | |
1863 | } | |
1864 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1865 | ||
1866 | /** | |
1867 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1868 | * @bin_buf: The buffer to place args' binary value | |
1869 | * @size: The size of the buffer(by words(32bits), not characters) | |
1870 | * @fmt: The format string to use | |
1871 | * @...: Arguments for the format string | |
1872 | * | |
1873 | * The function returns the number of words(u32) written | |
1874 | * into @bin_buf. | |
1875 | */ | |
1876 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1877 | { | |
1878 | va_list args; | |
1879 | int ret; | |
1880 | ||
1881 | va_start(args, fmt); | |
1882 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1883 | va_end(args); | |
7b9186f5 | 1884 | |
4370aa4a LJ |
1885 | return ret; |
1886 | } | |
1887 | EXPORT_SYMBOL_GPL(bprintf); | |
1888 | ||
1889 | #endif /* CONFIG_BINARY_PRINTF */ | |
1890 | ||
1da177e4 LT |
1891 | /** |
1892 | * vsscanf - Unformat a buffer into a list of arguments | |
1893 | * @buf: input buffer | |
1894 | * @fmt: format of buffer | |
1895 | * @args: arguments | |
1896 | */ | |
7b9186f5 | 1897 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
1898 | { |
1899 | const char *str = buf; | |
1900 | char *next; | |
1901 | char digit; | |
1902 | int num = 0; | |
ef0658f3 JP |
1903 | u8 qualifier; |
1904 | u8 base; | |
1905 | s16 field_width; | |
d4be151b | 1906 | bool is_sign; |
1da177e4 | 1907 | |
7b9186f5 | 1908 | while (*fmt && *str) { |
1da177e4 LT |
1909 | /* skip any white space in format */ |
1910 | /* white space in format matchs any amount of | |
1911 | * white space, including none, in the input. | |
1912 | */ | |
1913 | if (isspace(*fmt)) { | |
e7d2860b AGR |
1914 | fmt = skip_spaces(++fmt); |
1915 | str = skip_spaces(str); | |
1da177e4 LT |
1916 | } |
1917 | ||
1918 | /* anything that is not a conversion must match exactly */ | |
1919 | if (*fmt != '%' && *fmt) { | |
1920 | if (*fmt++ != *str++) | |
1921 | break; | |
1922 | continue; | |
1923 | } | |
1924 | ||
1925 | if (!*fmt) | |
1926 | break; | |
1927 | ++fmt; | |
7b9186f5 | 1928 | |
1da177e4 LT |
1929 | /* skip this conversion. |
1930 | * advance both strings to next white space | |
1931 | */ | |
1932 | if (*fmt == '*') { | |
8fccae2c | 1933 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
1934 | fmt++; |
1935 | while (!isspace(*str) && *str) | |
1936 | str++; | |
1937 | continue; | |
1938 | } | |
1939 | ||
1940 | /* get field width */ | |
1941 | field_width = -1; | |
1942 | if (isdigit(*fmt)) | |
1943 | field_width = skip_atoi(&fmt); | |
1944 | ||
1945 | /* get conversion qualifier */ | |
1946 | qualifier = -1; | |
08562cb2 AGR |
1947 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1948 | TOLOWER(*fmt) == 'z') { | |
1da177e4 LT |
1949 | qualifier = *fmt++; |
1950 | if (unlikely(qualifier == *fmt)) { | |
1951 | if (qualifier == 'h') { | |
1952 | qualifier = 'H'; | |
1953 | fmt++; | |
1954 | } else if (qualifier == 'l') { | |
1955 | qualifier = 'L'; | |
1956 | fmt++; | |
1957 | } | |
1958 | } | |
1959 | } | |
1da177e4 LT |
1960 | |
1961 | if (!*fmt || !*str) | |
1962 | break; | |
1963 | ||
d4be151b AGR |
1964 | base = 10; |
1965 | is_sign = 0; | |
1966 | ||
7b9186f5 | 1967 | switch (*fmt++) { |
1da177e4 LT |
1968 | case 'c': |
1969 | { | |
7b9186f5 | 1970 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
1971 | if (field_width == -1) |
1972 | field_width = 1; | |
1973 | do { | |
1974 | *s++ = *str++; | |
1975 | } while (--field_width > 0 && *str); | |
1976 | num++; | |
1977 | } | |
1978 | continue; | |
1979 | case 's': | |
1980 | { | |
7b9186f5 AGR |
1981 | char *s = (char *)va_arg(args, char *); |
1982 | if (field_width == -1) | |
ef0658f3 | 1983 | field_width = SHORT_MAX; |
1da177e4 | 1984 | /* first, skip leading white space in buffer */ |
e7d2860b | 1985 | str = skip_spaces(str); |
1da177e4 LT |
1986 | |
1987 | /* now copy until next white space */ | |
7b9186f5 | 1988 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 1989 | *s++ = *str++; |
1da177e4 LT |
1990 | *s = '\0'; |
1991 | num++; | |
1992 | } | |
1993 | continue; | |
1994 | case 'n': | |
1995 | /* return number of characters read so far */ | |
1996 | { | |
7b9186f5 | 1997 | int *i = (int *)va_arg(args, int*); |
1da177e4 LT |
1998 | *i = str - buf; |
1999 | } | |
2000 | continue; | |
2001 | case 'o': | |
2002 | base = 8; | |
2003 | break; | |
2004 | case 'x': | |
2005 | case 'X': | |
2006 | base = 16; | |
2007 | break; | |
2008 | case 'i': | |
7b9186f5 | 2009 | base = 0; |
1da177e4 LT |
2010 | case 'd': |
2011 | is_sign = 1; | |
2012 | case 'u': | |
2013 | break; | |
2014 | case '%': | |
2015 | /* looking for '%' in str */ | |
7b9186f5 | 2016 | if (*str++ != '%') |
1da177e4 LT |
2017 | return num; |
2018 | continue; | |
2019 | default: | |
2020 | /* invalid format; stop here */ | |
2021 | return num; | |
2022 | } | |
2023 | ||
2024 | /* have some sort of integer conversion. | |
2025 | * first, skip white space in buffer. | |
2026 | */ | |
e7d2860b | 2027 | str = skip_spaces(str); |
1da177e4 LT |
2028 | |
2029 | digit = *str; | |
2030 | if (is_sign && digit == '-') | |
2031 | digit = *(str + 1); | |
2032 | ||
2033 | if (!digit | |
7b9186f5 AGR |
2034 | || (base == 16 && !isxdigit(digit)) |
2035 | || (base == 10 && !isdigit(digit)) | |
2036 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2037 | || (base == 0 && !isdigit(digit))) | |
2038 | break; | |
1da177e4 | 2039 | |
7b9186f5 | 2040 | switch (qualifier) { |
1da177e4 LT |
2041 | case 'H': /* that's 'hh' in format */ |
2042 | if (is_sign) { | |
7b9186f5 AGR |
2043 | signed char *s = (signed char *)va_arg(args, signed char *); |
2044 | *s = (signed char)simple_strtol(str, &next, base); | |
1da177e4 | 2045 | } else { |
7b9186f5 AGR |
2046 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); |
2047 | *s = (unsigned char)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2048 | } |
2049 | break; | |
2050 | case 'h': | |
2051 | if (is_sign) { | |
7b9186f5 AGR |
2052 | short *s = (short *)va_arg(args, short *); |
2053 | *s = (short)simple_strtol(str, &next, base); | |
1da177e4 | 2054 | } else { |
7b9186f5 AGR |
2055 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); |
2056 | *s = (unsigned short)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2057 | } |
2058 | break; | |
2059 | case 'l': | |
2060 | if (is_sign) { | |
7b9186f5 AGR |
2061 | long *l = (long *)va_arg(args, long *); |
2062 | *l = simple_strtol(str, &next, base); | |
1da177e4 | 2063 | } else { |
7b9186f5 AGR |
2064 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); |
2065 | *l = simple_strtoul(str, &next, base); | |
1da177e4 LT |
2066 | } |
2067 | break; | |
2068 | case 'L': | |
2069 | if (is_sign) { | |
7b9186f5 AGR |
2070 | long long *l = (long long *)va_arg(args, long long *); |
2071 | *l = simple_strtoll(str, &next, base); | |
1da177e4 | 2072 | } else { |
7b9186f5 AGR |
2073 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); |
2074 | *l = simple_strtoull(str, &next, base); | |
1da177e4 LT |
2075 | } |
2076 | break; | |
2077 | case 'Z': | |
2078 | case 'z': | |
2079 | { | |
7b9186f5 AGR |
2080 | size_t *s = (size_t *)va_arg(args, size_t *); |
2081 | *s = (size_t)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2082 | } |
2083 | break; | |
2084 | default: | |
2085 | if (is_sign) { | |
7b9186f5 AGR |
2086 | int *i = (int *)va_arg(args, int *); |
2087 | *i = (int)simple_strtol(str, &next, base); | |
1da177e4 | 2088 | } else { |
7b9186f5 AGR |
2089 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); |
2090 | *i = (unsigned int)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2091 | } |
2092 | break; | |
2093 | } | |
2094 | num++; | |
2095 | ||
2096 | if (!next) | |
2097 | break; | |
2098 | str = next; | |
2099 | } | |
c6b40d16 JB |
2100 | |
2101 | /* | |
2102 | * Now we've come all the way through so either the input string or the | |
2103 | * format ended. In the former case, there can be a %n at the current | |
2104 | * position in the format that needs to be filled. | |
2105 | */ | |
2106 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
2107 | int *p = (int *)va_arg(args, int *); | |
2108 | *p = str - buf; | |
2109 | } | |
2110 | ||
1da177e4 LT |
2111 | return num; |
2112 | } | |
1da177e4 LT |
2113 | EXPORT_SYMBOL(vsscanf); |
2114 | ||
2115 | /** | |
2116 | * sscanf - Unformat a buffer into a list of arguments | |
2117 | * @buf: input buffer | |
2118 | * @fmt: formatting of buffer | |
2119 | * @...: resulting arguments | |
2120 | */ | |
7b9186f5 | 2121 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2122 | { |
2123 | va_list args; | |
2124 | int i; | |
2125 | ||
7b9186f5 AGR |
2126 | va_start(args, fmt); |
2127 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2128 | va_end(args); |
7b9186f5 | 2129 | |
1da177e4 LT |
2130 | return i; |
2131 | } | |
1da177e4 | 2132 | EXPORT_SYMBOL(sscanf); |