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 | |
cf3b429b JP |
270 | static noinline_for_stack |
271 | int skip_atoi(const char **s) | |
1da177e4 | 272 | { |
7b9186f5 | 273 | int i = 0; |
1da177e4 LT |
274 | |
275 | while (isdigit(**s)) | |
276 | i = i*10 + *((*s)++) - '0'; | |
7b9186f5 | 277 | |
1da177e4 LT |
278 | return i; |
279 | } | |
280 | ||
4277eedd DV |
281 | /* Decimal conversion is by far the most typical, and is used |
282 | * for /proc and /sys data. This directly impacts e.g. top performance | |
283 | * with many processes running. We optimize it for speed | |
284 | * using code from | |
285 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
286 | * (with permission from the author, Douglas W. Jones). */ | |
287 | ||
288 | /* Formats correctly any integer in [0,99999]. | |
289 | * Outputs from one to five digits depending on input. | |
290 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
cf3b429b JP |
291 | static noinline_for_stack |
292 | char *put_dec_trunc(char *buf, unsigned q) | |
4277eedd DV |
293 | { |
294 | unsigned d3, d2, d1, d0; | |
295 | d1 = (q>>4) & 0xf; | |
296 | d2 = (q>>8) & 0xf; | |
297 | d3 = (q>>12); | |
298 | ||
299 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
300 | q = (d0 * 0xcd) >> 11; | |
301 | d0 = d0 - 10*q; | |
302 | *buf++ = d0 + '0'; /* least significant digit */ | |
303 | d1 = q + 9*d3 + 5*d2 + d1; | |
304 | if (d1 != 0) { | |
305 | q = (d1 * 0xcd) >> 11; | |
306 | d1 = d1 - 10*q; | |
307 | *buf++ = d1 + '0'; /* next digit */ | |
308 | ||
309 | d2 = q + 2*d2; | |
310 | if ((d2 != 0) || (d3 != 0)) { | |
311 | q = (d2 * 0xd) >> 7; | |
312 | d2 = d2 - 10*q; | |
313 | *buf++ = d2 + '0'; /* next digit */ | |
314 | ||
315 | d3 = q + 4*d3; | |
316 | if (d3 != 0) { | |
317 | q = (d3 * 0xcd) >> 11; | |
318 | d3 = d3 - 10*q; | |
319 | *buf++ = d3 + '0'; /* next digit */ | |
320 | if (q != 0) | |
7b9186f5 | 321 | *buf++ = q + '0'; /* most sign. digit */ |
4277eedd DV |
322 | } |
323 | } | |
324 | } | |
7b9186f5 | 325 | |
4277eedd DV |
326 | return buf; |
327 | } | |
328 | /* Same with if's removed. Always emits five digits */ | |
cf3b429b JP |
329 | static noinline_for_stack |
330 | char *put_dec_full(char *buf, unsigned q) | |
4277eedd DV |
331 | { |
332 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
333 | /* but anyway, gcc produces better code with full-sized ints */ | |
334 | unsigned d3, d2, d1, d0; | |
335 | d1 = (q>>4) & 0xf; | |
336 | d2 = (q>>8) & 0xf; | |
337 | d3 = (q>>12); | |
338 | ||
7b9186f5 AGR |
339 | /* |
340 | * Possible ways to approx. divide by 10 | |
341 | * gcc -O2 replaces multiply with shifts and adds | |
342 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
343 | * (x * 0x67) >> 10: 1100111 | |
344 | * (x * 0x34) >> 9: 110100 - same | |
345 | * (x * 0x1a) >> 8: 11010 - same | |
346 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
347 | */ | |
4277eedd DV |
348 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
349 | q = (d0 * 0xcd) >> 11; | |
350 | d0 = d0 - 10*q; | |
351 | *buf++ = d0 + '0'; | |
352 | d1 = q + 9*d3 + 5*d2 + d1; | |
353 | q = (d1 * 0xcd) >> 11; | |
354 | d1 = d1 - 10*q; | |
355 | *buf++ = d1 + '0'; | |
356 | ||
357 | d2 = q + 2*d2; | |
358 | q = (d2 * 0xd) >> 7; | |
359 | d2 = d2 - 10*q; | |
360 | *buf++ = d2 + '0'; | |
361 | ||
362 | d3 = q + 4*d3; | |
363 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
364 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
365 | d3 = d3 - 10*q; | |
366 | *buf++ = d3 + '0'; | |
367 | *buf++ = q + '0'; | |
7b9186f5 | 368 | |
4277eedd DV |
369 | return buf; |
370 | } | |
371 | /* No inlining helps gcc to use registers better */ | |
cf3b429b JP |
372 | static noinline_for_stack |
373 | char *put_dec(char *buf, unsigned long long num) | |
4277eedd DV |
374 | { |
375 | while (1) { | |
376 | unsigned rem; | |
377 | if (num < 100000) | |
378 | return put_dec_trunc(buf, num); | |
379 | rem = do_div(num, 100000); | |
380 | buf = put_dec_full(buf, rem); | |
381 | } | |
382 | } | |
383 | ||
1da177e4 LT |
384 | #define ZEROPAD 1 /* pad with zero */ |
385 | #define SIGN 2 /* unsigned/signed long */ | |
386 | #define PLUS 4 /* show plus */ | |
387 | #define SPACE 8 /* space if plus */ | |
388 | #define LEFT 16 /* left justified */ | |
b89dc5d6 BH |
389 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
390 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 391 | |
fef20d9c FW |
392 | enum format_type { |
393 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 394 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
395 | FORMAT_TYPE_PRECISION, |
396 | FORMAT_TYPE_CHAR, | |
397 | FORMAT_TYPE_STR, | |
398 | FORMAT_TYPE_PTR, | |
399 | FORMAT_TYPE_PERCENT_CHAR, | |
400 | FORMAT_TYPE_INVALID, | |
401 | FORMAT_TYPE_LONG_LONG, | |
402 | FORMAT_TYPE_ULONG, | |
403 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
404 | FORMAT_TYPE_UBYTE, |
405 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
406 | FORMAT_TYPE_USHORT, |
407 | FORMAT_TYPE_SHORT, | |
408 | FORMAT_TYPE_UINT, | |
409 | FORMAT_TYPE_INT, | |
410 | FORMAT_TYPE_NRCHARS, | |
411 | FORMAT_TYPE_SIZE_T, | |
412 | FORMAT_TYPE_PTRDIFF | |
413 | }; | |
414 | ||
415 | struct printf_spec { | |
4e310fda | 416 | u8 type; /* format_type enum */ |
ef0658f3 | 417 | u8 flags; /* flags to number() */ |
4e310fda JP |
418 | u8 base; /* number base, 8, 10 or 16 only */ |
419 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
420 | s16 field_width; /* width of output field */ | |
421 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
422 | }; |
423 | ||
cf3b429b JP |
424 | static noinline_for_stack |
425 | char *number(char *buf, char *end, unsigned long long num, | |
426 | struct printf_spec spec) | |
1da177e4 | 427 | { |
9b706aee DV |
428 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
429 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
430 | ||
431 | char tmp[66]; | |
432 | char sign; | |
433 | char locase; | |
fef20d9c | 434 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 LT |
435 | int i; |
436 | ||
9b706aee DV |
437 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
438 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
439 | locase = (spec.flags & SMALL); |
440 | if (spec.flags & LEFT) | |
441 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 442 | sign = 0; |
fef20d9c | 443 | if (spec.flags & SIGN) { |
7b9186f5 | 444 | if ((signed long long)num < 0) { |
1da177e4 | 445 | sign = '-'; |
7b9186f5 | 446 | num = -(signed long long)num; |
fef20d9c FW |
447 | spec.field_width--; |
448 | } else if (spec.flags & PLUS) { | |
1da177e4 | 449 | sign = '+'; |
fef20d9c FW |
450 | spec.field_width--; |
451 | } else if (spec.flags & SPACE) { | |
1da177e4 | 452 | sign = ' '; |
fef20d9c | 453 | spec.field_width--; |
1da177e4 LT |
454 | } |
455 | } | |
b39a7340 | 456 | if (need_pfx) { |
fef20d9c FW |
457 | spec.field_width--; |
458 | if (spec.base == 16) | |
459 | spec.field_width--; | |
1da177e4 | 460 | } |
b39a7340 DV |
461 | |
462 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
463 | i = 0; |
464 | if (num == 0) | |
b39a7340 | 465 | tmp[i++] = '0'; |
4277eedd DV |
466 | /* Generic code, for any base: |
467 | else do { | |
9b706aee | 468 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
469 | } while (num != 0); |
470 | */ | |
fef20d9c FW |
471 | else if (spec.base != 10) { /* 8 or 16 */ |
472 | int mask = spec.base - 1; | |
b39a7340 | 473 | int shift = 3; |
7b9186f5 AGR |
474 | |
475 | if (spec.base == 16) | |
476 | shift = 4; | |
b39a7340 | 477 | do { |
9b706aee | 478 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
479 | num >>= shift; |
480 | } while (num); | |
4277eedd DV |
481 | } else { /* base 10 */ |
482 | i = put_dec(tmp, num) - tmp; | |
483 | } | |
b39a7340 DV |
484 | |
485 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
486 | if (i > spec.precision) |
487 | spec.precision = i; | |
b39a7340 | 488 | /* leading space padding */ |
fef20d9c FW |
489 | spec.field_width -= spec.precision; |
490 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
7b9186f5 | 491 | while (--spec.field_width >= 0) { |
f796937a | 492 | if (buf < end) |
1da177e4 LT |
493 | *buf = ' '; |
494 | ++buf; | |
495 | } | |
496 | } | |
b39a7340 | 497 | /* sign */ |
1da177e4 | 498 | if (sign) { |
f796937a | 499 | if (buf < end) |
1da177e4 LT |
500 | *buf = sign; |
501 | ++buf; | |
502 | } | |
b39a7340 DV |
503 | /* "0x" / "0" prefix */ |
504 | if (need_pfx) { | |
505 | if (buf < end) | |
506 | *buf = '0'; | |
507 | ++buf; | |
fef20d9c | 508 | if (spec.base == 16) { |
f796937a | 509 | if (buf < end) |
9b706aee | 510 | *buf = ('X' | locase); |
1da177e4 LT |
511 | ++buf; |
512 | } | |
513 | } | |
b39a7340 | 514 | /* zero or space padding */ |
fef20d9c FW |
515 | if (!(spec.flags & LEFT)) { |
516 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
517 | while (--spec.field_width >= 0) { | |
f796937a | 518 | if (buf < end) |
1da177e4 LT |
519 | *buf = c; |
520 | ++buf; | |
521 | } | |
522 | } | |
b39a7340 | 523 | /* hmm even more zero padding? */ |
fef20d9c | 524 | while (i <= --spec.precision) { |
f796937a | 525 | if (buf < end) |
1da177e4 LT |
526 | *buf = '0'; |
527 | ++buf; | |
528 | } | |
b39a7340 DV |
529 | /* actual digits of result */ |
530 | while (--i >= 0) { | |
f796937a | 531 | if (buf < end) |
1da177e4 LT |
532 | *buf = tmp[i]; |
533 | ++buf; | |
534 | } | |
b39a7340 | 535 | /* trailing space padding */ |
fef20d9c | 536 | while (--spec.field_width >= 0) { |
f796937a | 537 | if (buf < end) |
1da177e4 LT |
538 | *buf = ' '; |
539 | ++buf; | |
540 | } | |
7b9186f5 | 541 | |
1da177e4 LT |
542 | return buf; |
543 | } | |
544 | ||
cf3b429b JP |
545 | static noinline_for_stack |
546 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
547 | { |
548 | int len, i; | |
549 | ||
550 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 551 | s = "(null)"; |
0f9bfa56 | 552 | |
fef20d9c | 553 | len = strnlen(s, spec.precision); |
0f9bfa56 | 554 | |
fef20d9c FW |
555 | if (!(spec.flags & LEFT)) { |
556 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
557 | if (buf < end) |
558 | *buf = ' '; | |
559 | ++buf; | |
560 | } | |
561 | } | |
562 | for (i = 0; i < len; ++i) { | |
563 | if (buf < end) | |
564 | *buf = *s; | |
565 | ++buf; ++s; | |
566 | } | |
fef20d9c | 567 | while (len < spec.field_width--) { |
0f9bfa56 LT |
568 | if (buf < end) |
569 | *buf = ' '; | |
570 | ++buf; | |
571 | } | |
7b9186f5 | 572 | |
0f9bfa56 LT |
573 | return buf; |
574 | } | |
575 | ||
cf3b429b JP |
576 | static noinline_for_stack |
577 | char *symbol_string(char *buf, char *end, void *ptr, | |
578 | struct printf_spec spec, char ext) | |
0fe1ef24 LT |
579 | { |
580 | unsigned long value = (unsigned long) ptr; | |
581 | #ifdef CONFIG_KALLSYMS | |
582 | char sym[KSYM_SYMBOL_LEN]; | |
91adcd2c | 583 | if (ext != 'f' && ext != 's') |
0c8b946e FW |
584 | sprint_symbol(sym, value); |
585 | else | |
586 | kallsyms_lookup(value, NULL, NULL, NULL, sym); | |
7b9186f5 | 587 | |
fef20d9c | 588 | return string(buf, end, sym, spec); |
0fe1ef24 | 589 | #else |
7b9186f5 | 590 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
591 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
592 | spec.base = 16; | |
7b9186f5 | 593 | |
fef20d9c | 594 | return number(buf, end, value, spec); |
0fe1ef24 LT |
595 | #endif |
596 | } | |
597 | ||
cf3b429b JP |
598 | static noinline_for_stack |
599 | char *resource_string(char *buf, char *end, struct resource *res, | |
600 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
601 | { |
602 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 603 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
604 | #endif |
605 | ||
606 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 607 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 608 | #endif |
4da0b66c | 609 | static const struct printf_spec io_spec = { |
fef20d9c | 610 | .base = 16, |
4da0b66c | 611 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
612 | .precision = -1, |
613 | .flags = SPECIAL | SMALL | ZEROPAD, | |
614 | }; | |
4da0b66c BH |
615 | static const struct printf_spec mem_spec = { |
616 | .base = 16, | |
617 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
618 | .precision = -1, | |
619 | .flags = SPECIAL | SMALL | ZEROPAD, | |
620 | }; | |
0f4050c7 BH |
621 | static const struct printf_spec bus_spec = { |
622 | .base = 16, | |
623 | .field_width = 2, | |
624 | .precision = -1, | |
625 | .flags = SMALL | ZEROPAD, | |
626 | }; | |
4da0b66c | 627 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
628 | .base = 10, |
629 | .precision = -1, | |
630 | .flags = 0, | |
631 | }; | |
4da0b66c | 632 | static const struct printf_spec str_spec = { |
fd95541e BH |
633 | .field_width = -1, |
634 | .precision = 10, | |
635 | .flags = LEFT, | |
636 | }; | |
4da0b66c | 637 | static const struct printf_spec flag_spec = { |
fd95541e BH |
638 | .base = 16, |
639 | .precision = -1, | |
640 | .flags = SPECIAL | SMALL, | |
641 | }; | |
c7dabef8 BH |
642 | |
643 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
644 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
645 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
646 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 647 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
648 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
649 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
650 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
651 | ||
332d2e78 | 652 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 653 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 654 | const struct printf_spec *specp; |
332d2e78 LT |
655 | |
656 | *p++ = '['; | |
4da0b66c | 657 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 658 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
659 | specp = &io_spec; |
660 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 661 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
662 | specp = &mem_spec; |
663 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 664 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
665 | specp = &dec_spec; |
666 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 667 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 668 | specp = &dec_spec; |
0f4050c7 BH |
669 | } else if (res->flags & IORESOURCE_BUS) { |
670 | p = string(p, pend, "bus ", str_spec); | |
671 | specp = &bus_spec; | |
4da0b66c | 672 | } else { |
c7dabef8 | 673 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 674 | specp = &mem_spec; |
c7dabef8 | 675 | decode = 0; |
fd95541e | 676 | } |
4da0b66c | 677 | p = number(p, pend, res->start, *specp); |
c91d3376 BH |
678 | if (res->start != res->end) { |
679 | *p++ = '-'; | |
4da0b66c | 680 | p = number(p, pend, res->end, *specp); |
c91d3376 | 681 | } |
c7dabef8 | 682 | if (decode) { |
fd95541e BH |
683 | if (res->flags & IORESOURCE_MEM_64) |
684 | p = string(p, pend, " 64bit", str_spec); | |
685 | if (res->flags & IORESOURCE_PREFETCH) | |
686 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
687 | if (res->flags & IORESOURCE_WINDOW) |
688 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
689 | if (res->flags & IORESOURCE_DISABLED) |
690 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
691 | } else { |
692 | p = string(p, pend, " flags ", str_spec); | |
693 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 694 | } |
332d2e78 | 695 | *p++ = ']'; |
c7dabef8 | 696 | *p = '\0'; |
332d2e78 | 697 | |
fef20d9c | 698 | return string(buf, end, sym, spec); |
332d2e78 LT |
699 | } |
700 | ||
cf3b429b JP |
701 | static noinline_for_stack |
702 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
703 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 704 | { |
8a27f7c9 | 705 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
706 | char *p = mac_addr; |
707 | int i; | |
bc7259a2 JP |
708 | char separator; |
709 | ||
710 | if (fmt[1] == 'F') { /* FDDI canonical format */ | |
bc7259a2 JP |
711 | separator = '-'; |
712 | } else { | |
bc7259a2 JP |
713 | separator = ':'; |
714 | } | |
dd45c9cf HH |
715 | |
716 | for (i = 0; i < 6; i++) { | |
c8e00060 | 717 | p = pack_hex_byte(p, addr[i]); |
8a27f7c9 | 718 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 719 | *p++ = separator; |
dd45c9cf HH |
720 | } |
721 | *p = '\0'; | |
722 | ||
fef20d9c | 723 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
724 | } |
725 | ||
cf3b429b JP |
726 | static noinline_for_stack |
727 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
728 | { |
729 | int i; | |
0159f24e JP |
730 | bool leading_zeros = (fmt[0] == 'i'); |
731 | int index; | |
732 | int step; | |
733 | ||
734 | switch (fmt[2]) { | |
735 | case 'h': | |
736 | #ifdef __BIG_ENDIAN | |
737 | index = 0; | |
738 | step = 1; | |
739 | #else | |
740 | index = 3; | |
741 | step = -1; | |
742 | #endif | |
743 | break; | |
744 | case 'l': | |
745 | index = 3; | |
746 | step = -1; | |
747 | break; | |
748 | case 'n': | |
749 | case 'b': | |
750 | default: | |
751 | index = 0; | |
752 | step = 1; | |
753 | break; | |
754 | } | |
8a27f7c9 JP |
755 | for (i = 0; i < 4; i++) { |
756 | char temp[3]; /* hold each IP quad in reverse order */ | |
0159f24e | 757 | int digits = put_dec_trunc(temp, addr[index]) - temp; |
8a27f7c9 JP |
758 | if (leading_zeros) { |
759 | if (digits < 3) | |
760 | *p++ = '0'; | |
761 | if (digits < 2) | |
762 | *p++ = '0'; | |
763 | } | |
764 | /* reverse the digits in the quad */ | |
765 | while (digits--) | |
766 | *p++ = temp[digits]; | |
767 | if (i < 3) | |
768 | *p++ = '.'; | |
0159f24e | 769 | index += step; |
8a27f7c9 | 770 | } |
8a27f7c9 | 771 | *p = '\0'; |
7b9186f5 | 772 | |
8a27f7c9 JP |
773 | return p; |
774 | } | |
775 | ||
cf3b429b JP |
776 | static noinline_for_stack |
777 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 778 | { |
7b9186f5 | 779 | int i, j, range; |
8a27f7c9 JP |
780 | unsigned char zerolength[8]; |
781 | int longest = 1; | |
782 | int colonpos = -1; | |
783 | u16 word; | |
7b9186f5 | 784 | u8 hi, lo; |
8a27f7c9 | 785 | bool needcolon = false; |
eb78cd26 JP |
786 | bool useIPv4; |
787 | struct in6_addr in6; | |
788 | ||
789 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
790 | ||
791 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
792 | |
793 | memset(zerolength, 0, sizeof(zerolength)); | |
794 | ||
795 | if (useIPv4) | |
796 | range = 6; | |
797 | else | |
798 | range = 8; | |
799 | ||
800 | /* find position of longest 0 run */ | |
801 | for (i = 0; i < range; i++) { | |
802 | for (j = i; j < range; j++) { | |
eb78cd26 | 803 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
804 | break; |
805 | zerolength[i]++; | |
806 | } | |
807 | } | |
808 | for (i = 0; i < range; i++) { | |
809 | if (zerolength[i] > longest) { | |
810 | longest = zerolength[i]; | |
811 | colonpos = i; | |
812 | } | |
813 | } | |
689afa7d | 814 | |
8a27f7c9 JP |
815 | /* emit address */ |
816 | for (i = 0; i < range; i++) { | |
817 | if (i == colonpos) { | |
818 | if (needcolon || i == 0) | |
819 | *p++ = ':'; | |
820 | *p++ = ':'; | |
821 | needcolon = false; | |
822 | i += longest - 1; | |
823 | continue; | |
824 | } | |
825 | if (needcolon) { | |
826 | *p++ = ':'; | |
827 | needcolon = false; | |
828 | } | |
829 | /* hex u16 without leading 0s */ | |
eb78cd26 | 830 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
831 | hi = word >> 8; |
832 | lo = word & 0xff; | |
833 | if (hi) { | |
834 | if (hi > 0x0f) | |
835 | p = pack_hex_byte(p, hi); | |
836 | else | |
837 | *p++ = hex_asc_lo(hi); | |
b5ff992b | 838 | p = pack_hex_byte(p, lo); |
8a27f7c9 | 839 | } |
b5ff992b | 840 | else if (lo > 0x0f) |
8a27f7c9 JP |
841 | p = pack_hex_byte(p, lo); |
842 | else | |
843 | *p++ = hex_asc_lo(lo); | |
844 | needcolon = true; | |
845 | } | |
846 | ||
847 | if (useIPv4) { | |
848 | if (needcolon) | |
849 | *p++ = ':'; | |
0159f24e | 850 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 851 | } |
8a27f7c9 | 852 | *p = '\0'; |
7b9186f5 | 853 | |
8a27f7c9 JP |
854 | return p; |
855 | } | |
856 | ||
cf3b429b JP |
857 | static noinline_for_stack |
858 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
859 | { |
860 | int i; | |
7b9186f5 | 861 | |
689afa7d | 862 | for (i = 0; i < 8; i++) { |
eb78cd26 JP |
863 | p = pack_hex_byte(p, *addr++); |
864 | p = pack_hex_byte(p, *addr++); | |
8a27f7c9 | 865 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
866 | *p++ = ':'; |
867 | } | |
868 | *p = '\0'; | |
7b9186f5 | 869 | |
8a27f7c9 JP |
870 | return p; |
871 | } | |
872 | ||
cf3b429b JP |
873 | static noinline_for_stack |
874 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
875 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
876 | { |
877 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
878 | ||
879 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 880 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 881 | else |
eb78cd26 | 882 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 883 | |
fef20d9c | 884 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
885 | } |
886 | ||
cf3b429b JP |
887 | static noinline_for_stack |
888 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
889 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 890 | { |
8a27f7c9 | 891 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 892 | |
0159f24e | 893 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 894 | |
fef20d9c | 895 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
896 | } |
897 | ||
cf3b429b JP |
898 | static noinline_for_stack |
899 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
900 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
901 | { |
902 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
903 | char *p = uuid; | |
904 | int i; | |
905 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
906 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
907 | const u8 *index = be; | |
908 | bool uc = false; | |
909 | ||
910 | switch (*(++fmt)) { | |
911 | case 'L': | |
912 | uc = true; /* fall-through */ | |
913 | case 'l': | |
914 | index = le; | |
915 | break; | |
916 | case 'B': | |
917 | uc = true; | |
918 | break; | |
919 | } | |
920 | ||
921 | for (i = 0; i < 16; i++) { | |
922 | p = pack_hex_byte(p, addr[index[i]]); | |
923 | switch (i) { | |
924 | case 3: | |
925 | case 5: | |
926 | case 7: | |
927 | case 9: | |
928 | *p++ = '-'; | |
929 | break; | |
930 | } | |
931 | } | |
932 | ||
933 | *p = 0; | |
934 | ||
935 | if (uc) { | |
936 | p = uuid; | |
937 | do { | |
938 | *p = toupper(*p); | |
939 | } while (*(++p)); | |
940 | } | |
941 | ||
942 | return string(buf, end, uuid, spec); | |
943 | } | |
944 | ||
4d8a743c LT |
945 | /* |
946 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
947 | * by an extra set of alphanumeric characters that are extended format | |
948 | * specifiers. | |
949 | * | |
332d2e78 LT |
950 | * Right now we handle: |
951 | * | |
0c8b946e FW |
952 | * - 'F' For symbolic function descriptor pointers with offset |
953 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
954 | * - 'S' For symbolic direct pointers with offset |
955 | * - 's' For symbolic direct pointers without offset | |
c7dabef8 BH |
956 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
957 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dd45c9cf HH |
958 | * - 'M' For a 6-byte MAC address, it prints the address in the |
959 | * usual colon-separated hex notation | |
8a27f7c9 | 960 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 961 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 962 | * with a dash-separated hex notation |
8a27f7c9 JP |
963 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
964 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
965 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
966 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
967 | * IPv6 omits the colons (01020304...0f) | |
968 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
0159f24e | 969 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order |
8a27f7c9 | 970 | * - 'I6c' for IPv6 addresses printed as specified by |
3f472402 | 971 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
9ac6e44e JP |
972 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
973 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
974 | * Options for %pU are: | |
975 | * b big endian lower case hex (default) | |
976 | * B big endian UPPER case hex | |
977 | * l little endian lower case hex | |
978 | * L little endian UPPER case hex | |
979 | * big endian output byte order is: | |
980 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
981 | * little endian output byte order is: | |
982 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
983 | * | |
332d2e78 LT |
984 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
985 | * function pointers are really function descriptors, which contain a | |
986 | * pointer to the real address. | |
4d8a743c | 987 | */ |
cf3b429b JP |
988 | static noinline_for_stack |
989 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
990 | struct printf_spec spec) | |
78a8bf69 | 991 | { |
d97106ab | 992 | if (!ptr) |
fef20d9c | 993 | return string(buf, end, "(null)", spec); |
d97106ab | 994 | |
0fe1ef24 LT |
995 | switch (*fmt) { |
996 | case 'F': | |
0c8b946e | 997 | case 'f': |
0fe1ef24 LT |
998 | ptr = dereference_function_descriptor(ptr); |
999 | /* Fallthrough */ | |
1000 | case 'S': | |
9ac6e44e | 1001 | case 's': |
0c8b946e | 1002 | return symbol_string(buf, end, ptr, spec, *fmt); |
332d2e78 | 1003 | case 'R': |
c7dabef8 | 1004 | case 'r': |
fd95541e | 1005 | return resource_string(buf, end, ptr, spec, fmt); |
8a27f7c9 JP |
1006 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1007 | case 'm': /* Contiguous: 000102030405 */ | |
bc7259a2 | 1008 | /* [mM]F (FDDI, bit reversed) */ |
8a27f7c9 JP |
1009 | return mac_address_string(buf, end, ptr, spec, fmt); |
1010 | case 'I': /* Formatted IP supported | |
1011 | * 4: 1.2.3.4 | |
1012 | * 6: 0001:0203:...:0708 | |
1013 | * 6c: 1::708 or 1::1.2.3.4 | |
1014 | */ | |
1015 | case 'i': /* Contiguous: | |
1016 | * 4: 001.002.003.004 | |
1017 | * 6: 000102...0f | |
1018 | */ | |
1019 | switch (fmt[1]) { | |
1020 | case '6': | |
1021 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1022 | case '4': | |
1023 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1024 | } | |
fef20d9c | 1025 | break; |
9ac6e44e JP |
1026 | case 'U': |
1027 | return uuid_string(buf, end, ptr, spec, fmt); | |
fef20d9c FW |
1028 | } |
1029 | spec.flags |= SMALL; | |
1030 | if (spec.field_width == -1) { | |
1031 | spec.field_width = 2*sizeof(void *); | |
1032 | spec.flags |= ZEROPAD; | |
1033 | } | |
1034 | spec.base = 16; | |
1035 | ||
1036 | return number(buf, end, (unsigned long) ptr, spec); | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * Helper function to decode printf style format. | |
1041 | * Each call decode a token from the format and return the | |
1042 | * number of characters read (or likely the delta where it wants | |
1043 | * to go on the next call). | |
1044 | * The decoded token is returned through the parameters | |
1045 | * | |
1046 | * 'h', 'l', or 'L' for integer fields | |
1047 | * 'z' support added 23/7/1999 S.H. | |
1048 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1049 | * 't' added for ptrdiff_t | |
1050 | * | |
1051 | * @fmt: the format string | |
1052 | * @type of the token returned | |
1053 | * @flags: various flags such as +, -, # tokens.. | |
1054 | * @field_width: overwritten width | |
1055 | * @base: base of the number (octal, hex, ...) | |
1056 | * @precision: precision of a number | |
1057 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1058 | */ | |
cf3b429b JP |
1059 | static noinline_for_stack |
1060 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1061 | { |
1062 | const char *start = fmt; | |
fef20d9c FW |
1063 | |
1064 | /* we finished early by reading the field width */ | |
ed681a91 | 1065 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1066 | if (spec->field_width < 0) { |
1067 | spec->field_width = -spec->field_width; | |
1068 | spec->flags |= LEFT; | |
1069 | } | |
1070 | spec->type = FORMAT_TYPE_NONE; | |
1071 | goto precision; | |
1072 | } | |
1073 | ||
1074 | /* we finished early by reading the precision */ | |
1075 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1076 | if (spec->precision < 0) | |
1077 | spec->precision = 0; | |
1078 | ||
1079 | spec->type = FORMAT_TYPE_NONE; | |
1080 | goto qualifier; | |
1081 | } | |
1082 | ||
1083 | /* By default */ | |
1084 | spec->type = FORMAT_TYPE_NONE; | |
1085 | ||
1086 | for (; *fmt ; ++fmt) { | |
1087 | if (*fmt == '%') | |
1088 | break; | |
1089 | } | |
1090 | ||
1091 | /* Return the current non-format string */ | |
1092 | if (fmt != start || !*fmt) | |
1093 | return fmt - start; | |
1094 | ||
1095 | /* Process flags */ | |
1096 | spec->flags = 0; | |
1097 | ||
1098 | while (1) { /* this also skips first '%' */ | |
1099 | bool found = true; | |
1100 | ||
1101 | ++fmt; | |
1102 | ||
1103 | switch (*fmt) { | |
1104 | case '-': spec->flags |= LEFT; break; | |
1105 | case '+': spec->flags |= PLUS; break; | |
1106 | case ' ': spec->flags |= SPACE; break; | |
1107 | case '#': spec->flags |= SPECIAL; break; | |
1108 | case '0': spec->flags |= ZEROPAD; break; | |
1109 | default: found = false; | |
1110 | } | |
1111 | ||
1112 | if (!found) | |
1113 | break; | |
1114 | } | |
1115 | ||
1116 | /* get field width */ | |
1117 | spec->field_width = -1; | |
1118 | ||
1119 | if (isdigit(*fmt)) | |
1120 | spec->field_width = skip_atoi(&fmt); | |
1121 | else if (*fmt == '*') { | |
1122 | /* it's the next argument */ | |
ed681a91 | 1123 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1124 | return ++fmt - start; |
1125 | } | |
1126 | ||
1127 | precision: | |
1128 | /* get the precision */ | |
1129 | spec->precision = -1; | |
1130 | if (*fmt == '.') { | |
1131 | ++fmt; | |
1132 | if (isdigit(*fmt)) { | |
1133 | spec->precision = skip_atoi(&fmt); | |
1134 | if (spec->precision < 0) | |
1135 | spec->precision = 0; | |
1136 | } else if (*fmt == '*') { | |
1137 | /* it's the next argument */ | |
adf26f84 | 1138 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1139 | return ++fmt - start; |
1140 | } | |
1141 | } | |
1142 | ||
1143 | qualifier: | |
1144 | /* get the conversion qualifier */ | |
1145 | spec->qualifier = -1; | |
08562cb2 AGR |
1146 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1147 | TOLOWER(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1148 | spec->qualifier = *fmt++; |
1149 | if (unlikely(spec->qualifier == *fmt)) { | |
1150 | if (spec->qualifier == 'l') { | |
1151 | spec->qualifier = 'L'; | |
1152 | ++fmt; | |
1153 | } else if (spec->qualifier == 'h') { | |
1154 | spec->qualifier = 'H'; | |
1155 | ++fmt; | |
1156 | } | |
fef20d9c FW |
1157 | } |
1158 | } | |
1159 | ||
1160 | /* default base */ | |
1161 | spec->base = 10; | |
1162 | switch (*fmt) { | |
1163 | case 'c': | |
1164 | spec->type = FORMAT_TYPE_CHAR; | |
1165 | return ++fmt - start; | |
1166 | ||
1167 | case 's': | |
1168 | spec->type = FORMAT_TYPE_STR; | |
1169 | return ++fmt - start; | |
1170 | ||
1171 | case 'p': | |
1172 | spec->type = FORMAT_TYPE_PTR; | |
1173 | return fmt - start; | |
1174 | /* skip alnum */ | |
1175 | ||
1176 | case 'n': | |
1177 | spec->type = FORMAT_TYPE_NRCHARS; | |
1178 | return ++fmt - start; | |
1179 | ||
1180 | case '%': | |
1181 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1182 | return ++fmt - start; | |
1183 | ||
1184 | /* integer number formats - set up the flags and "break" */ | |
1185 | case 'o': | |
1186 | spec->base = 8; | |
1187 | break; | |
1188 | ||
1189 | case 'x': | |
1190 | spec->flags |= SMALL; | |
1191 | ||
1192 | case 'X': | |
1193 | spec->base = 16; | |
1194 | break; | |
1195 | ||
1196 | case 'd': | |
1197 | case 'i': | |
39e874f8 | 1198 | spec->flags |= SIGN; |
fef20d9c | 1199 | case 'u': |
4aa99606 | 1200 | break; |
fef20d9c FW |
1201 | |
1202 | default: | |
1203 | spec->type = FORMAT_TYPE_INVALID; | |
1204 | return fmt - start; | |
0fe1ef24 | 1205 | } |
fef20d9c FW |
1206 | |
1207 | if (spec->qualifier == 'L') | |
1208 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1209 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1210 | if (spec->flags & SIGN) |
fef20d9c FW |
1211 | spec->type = FORMAT_TYPE_LONG; |
1212 | else | |
1213 | spec->type = FORMAT_TYPE_ULONG; | |
08562cb2 | 1214 | } else if (TOLOWER(spec->qualifier) == 'z') { |
fef20d9c FW |
1215 | spec->type = FORMAT_TYPE_SIZE_T; |
1216 | } else if (spec->qualifier == 't') { | |
1217 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1218 | } else if (spec->qualifier == 'H') { |
1219 | if (spec->flags & SIGN) | |
1220 | spec->type = FORMAT_TYPE_BYTE; | |
1221 | else | |
1222 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1223 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1224 | if (spec->flags & SIGN) |
fef20d9c FW |
1225 | spec->type = FORMAT_TYPE_SHORT; |
1226 | else | |
1227 | spec->type = FORMAT_TYPE_USHORT; | |
1228 | } else { | |
39e874f8 | 1229 | if (spec->flags & SIGN) |
fef20d9c FW |
1230 | spec->type = FORMAT_TYPE_INT; |
1231 | else | |
1232 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1233 | } |
fef20d9c FW |
1234 | |
1235 | return ++fmt - start; | |
78a8bf69 LT |
1236 | } |
1237 | ||
1da177e4 LT |
1238 | /** |
1239 | * vsnprintf - Format a string and place it in a buffer | |
1240 | * @buf: The buffer to place the result into | |
1241 | * @size: The size of the buffer, including the trailing null space | |
1242 | * @fmt: The format string to use | |
1243 | * @args: Arguments for the format string | |
1244 | * | |
20036fdc | 1245 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1246 | * %pS output the name of a text symbol with offset |
1247 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1248 | * %pF output the name of a function pointer with its offset |
1249 | * %pf output the name of a function pointer without its offset | |
8a79503a UKK |
1250 | * %pR output the address range in a struct resource with decoded flags |
1251 | * %pr output the address range in a struct resource with raw flags | |
1252 | * %pM output a 6-byte MAC address with colons | |
1253 | * %pm output a 6-byte MAC address without colons | |
1254 | * %pI4 print an IPv4 address without leading zeros | |
1255 | * %pi4 print an IPv4 address with leading zeros | |
1256 | * %pI6 print an IPv6 address with colons | |
1257 | * %pi6 print an IPv6 address without colons | |
1258 | * %pI6c print an IPv6 address as specified by | |
3f472402 | 1259 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
8a79503a UKK |
1260 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1261 | * case. | |
0efb4d20 | 1262 | * %n is ignored |
20036fdc | 1263 | * |
1da177e4 LT |
1264 | * The return value is the number of characters which would |
1265 | * be generated for the given input, excluding the trailing | |
1266 | * '\0', as per ISO C99. If you want to have the exact | |
1267 | * number of characters written into @buf as return value | |
72fd4a35 | 1268 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1269 | * return is greater than or equal to @size, the resulting |
1270 | * string is truncated. | |
1271 | * | |
1272 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1273 | * You probably want snprintf() instead. |
1da177e4 LT |
1274 | */ |
1275 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1276 | { | |
1da177e4 | 1277 | unsigned long long num; |
d4be151b | 1278 | char *str, *end; |
fef20d9c | 1279 | struct printf_spec spec = {0}; |
1da177e4 | 1280 | |
f796937a JF |
1281 | /* Reject out-of-range values early. Large positive sizes are |
1282 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1283 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1284 | return 0; |
1da177e4 LT |
1285 | |
1286 | str = buf; | |
f796937a | 1287 | end = buf + size; |
1da177e4 | 1288 | |
f796937a JF |
1289 | /* Make sure end is always >= buf */ |
1290 | if (end < buf) { | |
1291 | end = ((void *)-1); | |
1292 | size = end - buf; | |
1da177e4 LT |
1293 | } |
1294 | ||
fef20d9c FW |
1295 | while (*fmt) { |
1296 | const char *old_fmt = fmt; | |
d4be151b | 1297 | int read = format_decode(fmt, &spec); |
1da177e4 | 1298 | |
fef20d9c | 1299 | fmt += read; |
1da177e4 | 1300 | |
fef20d9c FW |
1301 | switch (spec.type) { |
1302 | case FORMAT_TYPE_NONE: { | |
1303 | int copy = read; | |
1304 | if (str < end) { | |
1305 | if (copy > end - str) | |
1306 | copy = end - str; | |
1307 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1308 | } |
fef20d9c FW |
1309 | str += read; |
1310 | break; | |
1da177e4 LT |
1311 | } |
1312 | ||
ed681a91 | 1313 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1314 | spec.field_width = va_arg(args, int); |
1315 | break; | |
1da177e4 | 1316 | |
fef20d9c FW |
1317 | case FORMAT_TYPE_PRECISION: |
1318 | spec.precision = va_arg(args, int); | |
1319 | break; | |
1da177e4 | 1320 | |
d4be151b AGR |
1321 | case FORMAT_TYPE_CHAR: { |
1322 | char c; | |
1323 | ||
fef20d9c FW |
1324 | if (!(spec.flags & LEFT)) { |
1325 | while (--spec.field_width > 0) { | |
f796937a | 1326 | if (str < end) |
1da177e4 LT |
1327 | *str = ' '; |
1328 | ++str; | |
1da177e4 | 1329 | |
fef20d9c FW |
1330 | } |
1331 | } | |
1332 | c = (unsigned char) va_arg(args, int); | |
1333 | if (str < end) | |
1334 | *str = c; | |
1335 | ++str; | |
1336 | while (--spec.field_width > 0) { | |
f796937a | 1337 | if (str < end) |
fef20d9c | 1338 | *str = ' '; |
1da177e4 | 1339 | ++str; |
fef20d9c FW |
1340 | } |
1341 | break; | |
d4be151b | 1342 | } |
1da177e4 | 1343 | |
fef20d9c FW |
1344 | case FORMAT_TYPE_STR: |
1345 | str = string(str, end, va_arg(args, char *), spec); | |
1346 | break; | |
1da177e4 | 1347 | |
fef20d9c FW |
1348 | case FORMAT_TYPE_PTR: |
1349 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1350 | spec); | |
1351 | while (isalnum(*fmt)) | |
1352 | fmt++; | |
1353 | break; | |
1da177e4 | 1354 | |
fef20d9c FW |
1355 | case FORMAT_TYPE_PERCENT_CHAR: |
1356 | if (str < end) | |
1357 | *str = '%'; | |
1358 | ++str; | |
1359 | break; | |
1da177e4 | 1360 | |
fef20d9c FW |
1361 | case FORMAT_TYPE_INVALID: |
1362 | if (str < end) | |
1363 | *str = '%'; | |
1364 | ++str; | |
fef20d9c FW |
1365 | break; |
1366 | ||
1367 | case FORMAT_TYPE_NRCHARS: { | |
ef0658f3 | 1368 | u8 qualifier = spec.qualifier; |
fef20d9c FW |
1369 | |
1370 | if (qualifier == 'l') { | |
1371 | long *ip = va_arg(args, long *); | |
1372 | *ip = (str - buf); | |
08562cb2 | 1373 | } else if (TOLOWER(qualifier) == 'z') { |
fef20d9c FW |
1374 | size_t *ip = va_arg(args, size_t *); |
1375 | *ip = (str - buf); | |
1376 | } else { | |
1377 | int *ip = va_arg(args, int *); | |
1378 | *ip = (str - buf); | |
1379 | } | |
1380 | break; | |
1da177e4 | 1381 | } |
fef20d9c FW |
1382 | |
1383 | default: | |
1384 | switch (spec.type) { | |
1385 | case FORMAT_TYPE_LONG_LONG: | |
1386 | num = va_arg(args, long long); | |
1387 | break; | |
1388 | case FORMAT_TYPE_ULONG: | |
1389 | num = va_arg(args, unsigned long); | |
1390 | break; | |
1391 | case FORMAT_TYPE_LONG: | |
1392 | num = va_arg(args, long); | |
1393 | break; | |
1394 | case FORMAT_TYPE_SIZE_T: | |
1395 | num = va_arg(args, size_t); | |
1396 | break; | |
1397 | case FORMAT_TYPE_PTRDIFF: | |
1398 | num = va_arg(args, ptrdiff_t); | |
1399 | break; | |
a4e94ef0 Z |
1400 | case FORMAT_TYPE_UBYTE: |
1401 | num = (unsigned char) va_arg(args, int); | |
1402 | break; | |
1403 | case FORMAT_TYPE_BYTE: | |
1404 | num = (signed char) va_arg(args, int); | |
1405 | break; | |
fef20d9c FW |
1406 | case FORMAT_TYPE_USHORT: |
1407 | num = (unsigned short) va_arg(args, int); | |
1408 | break; | |
1409 | case FORMAT_TYPE_SHORT: | |
1410 | num = (short) va_arg(args, int); | |
1411 | break; | |
39e874f8 FW |
1412 | case FORMAT_TYPE_INT: |
1413 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1414 | break; |
1415 | default: | |
1416 | num = va_arg(args, unsigned int); | |
1417 | } | |
1418 | ||
1419 | str = number(str, end, num, spec); | |
1da177e4 | 1420 | } |
1da177e4 | 1421 | } |
fef20d9c | 1422 | |
f796937a JF |
1423 | if (size > 0) { |
1424 | if (str < end) | |
1425 | *str = '\0'; | |
1426 | else | |
0a6047ee | 1427 | end[-1] = '\0'; |
f796937a | 1428 | } |
fef20d9c | 1429 | |
f796937a | 1430 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1431 | return str-buf; |
fef20d9c | 1432 | |
1da177e4 | 1433 | } |
1da177e4 LT |
1434 | EXPORT_SYMBOL(vsnprintf); |
1435 | ||
1436 | /** | |
1437 | * vscnprintf - Format a string and place it in a buffer | |
1438 | * @buf: The buffer to place the result into | |
1439 | * @size: The size of the buffer, including the trailing null space | |
1440 | * @fmt: The format string to use | |
1441 | * @args: Arguments for the format string | |
1442 | * | |
1443 | * The return value is the number of characters which have been written into | |
1444 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
1445 | * returns 0. | |
1446 | * | |
1447 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1448 | * You probably want scnprintf() instead. |
20036fdc AK |
1449 | * |
1450 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1451 | */ |
1452 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1453 | { | |
1454 | int i; | |
1455 | ||
7b9186f5 AGR |
1456 | i = vsnprintf(buf, size, fmt, args); |
1457 | ||
1da177e4 LT |
1458 | return (i >= size) ? (size - 1) : i; |
1459 | } | |
1da177e4 LT |
1460 | EXPORT_SYMBOL(vscnprintf); |
1461 | ||
1462 | /** | |
1463 | * snprintf - Format a string and place it in a buffer | |
1464 | * @buf: The buffer to place the result into | |
1465 | * @size: The size of the buffer, including the trailing null space | |
1466 | * @fmt: The format string to use | |
1467 | * @...: Arguments for the format string | |
1468 | * | |
1469 | * The return value is the number of characters which would be | |
1470 | * generated for the given input, excluding the trailing null, | |
1471 | * as per ISO C99. If the return is greater than or equal to | |
1472 | * @size, the resulting string is truncated. | |
20036fdc AK |
1473 | * |
1474 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1475 | */ |
7b9186f5 | 1476 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1477 | { |
1478 | va_list args; | |
1479 | int i; | |
1480 | ||
1481 | va_start(args, fmt); | |
7b9186f5 | 1482 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1483 | va_end(args); |
7b9186f5 | 1484 | |
1da177e4 LT |
1485 | return i; |
1486 | } | |
1da177e4 LT |
1487 | EXPORT_SYMBOL(snprintf); |
1488 | ||
1489 | /** | |
1490 | * scnprintf - Format a string and place it in a buffer | |
1491 | * @buf: The buffer to place the result into | |
1492 | * @size: The size of the buffer, including the trailing null space | |
1493 | * @fmt: The format string to use | |
1494 | * @...: Arguments for the format string | |
1495 | * | |
1496 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 1497 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
1498 | */ |
1499 | ||
7b9186f5 | 1500 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1501 | { |
1502 | va_list args; | |
1503 | int i; | |
1504 | ||
1505 | va_start(args, fmt); | |
1506 | i = vsnprintf(buf, size, fmt, args); | |
1507 | va_end(args); | |
7b9186f5 | 1508 | |
1da177e4 LT |
1509 | return (i >= size) ? (size - 1) : i; |
1510 | } | |
1511 | EXPORT_SYMBOL(scnprintf); | |
1512 | ||
1513 | /** | |
1514 | * vsprintf - Format a string and place it in a buffer | |
1515 | * @buf: The buffer to place the result into | |
1516 | * @fmt: The format string to use | |
1517 | * @args: Arguments for the format string | |
1518 | * | |
1519 | * The function returns the number of characters written | |
72fd4a35 | 1520 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1521 | * buffer overflows. |
1522 | * | |
1523 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1524 | * You probably want sprintf() instead. |
20036fdc AK |
1525 | * |
1526 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1527 | */ |
1528 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1529 | { | |
1530 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1531 | } | |
1da177e4 LT |
1532 | EXPORT_SYMBOL(vsprintf); |
1533 | ||
1534 | /** | |
1535 | * sprintf - Format a string and place it in a buffer | |
1536 | * @buf: The buffer to place the result into | |
1537 | * @fmt: The format string to use | |
1538 | * @...: Arguments for the format string | |
1539 | * | |
1540 | * The function returns the number of characters written | |
72fd4a35 | 1541 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1542 | * buffer overflows. |
20036fdc AK |
1543 | * |
1544 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1545 | */ |
7b9186f5 | 1546 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
1547 | { |
1548 | va_list args; | |
1549 | int i; | |
1550 | ||
1551 | va_start(args, fmt); | |
7b9186f5 | 1552 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 1553 | va_end(args); |
7b9186f5 | 1554 | |
1da177e4 LT |
1555 | return i; |
1556 | } | |
1da177e4 LT |
1557 | EXPORT_SYMBOL(sprintf); |
1558 | ||
4370aa4a LJ |
1559 | #ifdef CONFIG_BINARY_PRINTF |
1560 | /* | |
1561 | * bprintf service: | |
1562 | * vbin_printf() - VA arguments to binary data | |
1563 | * bstr_printf() - Binary data to text string | |
1564 | */ | |
1565 | ||
1566 | /** | |
1567 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1568 | * @bin_buf: The buffer to place args' binary value | |
1569 | * @size: The size of the buffer(by words(32bits), not characters) | |
1570 | * @fmt: The format string to use | |
1571 | * @args: Arguments for the format string | |
1572 | * | |
1573 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1574 | * is skiped. | |
1575 | * | |
1576 | * The return value is the number of words(32bits) which would be generated for | |
1577 | * the given input. | |
1578 | * | |
1579 | * NOTE: | |
1580 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1581 | * valid for bstr_printf(). | |
1582 | */ | |
1583 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1584 | { | |
fef20d9c | 1585 | struct printf_spec spec = {0}; |
4370aa4a | 1586 | char *str, *end; |
4370aa4a LJ |
1587 | |
1588 | str = (char *)bin_buf; | |
1589 | end = (char *)(bin_buf + size); | |
1590 | ||
1591 | #define save_arg(type) \ | |
1592 | do { \ | |
1593 | if (sizeof(type) == 8) { \ | |
1594 | unsigned long long value; \ | |
1595 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1596 | value = va_arg(args, unsigned long long); \ | |
1597 | if (str + sizeof(type) <= end) { \ | |
1598 | *(u32 *)str = *(u32 *)&value; \ | |
1599 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1600 | } \ | |
1601 | } else { \ | |
1602 | unsigned long value; \ | |
1603 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1604 | value = va_arg(args, int); \ | |
1605 | if (str + sizeof(type) <= end) \ | |
1606 | *(typeof(type) *)str = (type)value; \ | |
1607 | } \ | |
1608 | str += sizeof(type); \ | |
1609 | } while (0) | |
1610 | ||
fef20d9c | 1611 | while (*fmt) { |
d4be151b | 1612 | int read = format_decode(fmt, &spec); |
4370aa4a | 1613 | |
fef20d9c | 1614 | fmt += read; |
4370aa4a | 1615 | |
fef20d9c FW |
1616 | switch (spec.type) { |
1617 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
1618 | case FORMAT_TYPE_INVALID: |
1619 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
1620 | break; |
1621 | ||
ed681a91 | 1622 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1623 | case FORMAT_TYPE_PRECISION: |
1624 | save_arg(int); | |
1625 | break; | |
1626 | ||
1627 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1628 | save_arg(char); |
fef20d9c FW |
1629 | break; |
1630 | ||
1631 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1632 | const char *save_str = va_arg(args, char *); |
1633 | size_t len; | |
6c356634 | 1634 | |
4370aa4a LJ |
1635 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1636 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 1637 | save_str = "(null)"; |
6c356634 AGR |
1638 | len = strlen(save_str) + 1; |
1639 | if (str + len < end) | |
1640 | memcpy(str, save_str, len); | |
1641 | str += len; | |
fef20d9c | 1642 | break; |
4370aa4a | 1643 | } |
fef20d9c FW |
1644 | |
1645 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1646 | save_arg(void *); |
1647 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1648 | while (isalnum(*fmt)) |
4370aa4a | 1649 | fmt++; |
fef20d9c FW |
1650 | break; |
1651 | ||
fef20d9c | 1652 | case FORMAT_TYPE_NRCHARS: { |
4370aa4a | 1653 | /* skip %n 's argument */ |
ef0658f3 | 1654 | u8 qualifier = spec.qualifier; |
4370aa4a LJ |
1655 | void *skip_arg; |
1656 | if (qualifier == 'l') | |
1657 | skip_arg = va_arg(args, long *); | |
08562cb2 | 1658 | else if (TOLOWER(qualifier) == 'z') |
4370aa4a LJ |
1659 | skip_arg = va_arg(args, size_t *); |
1660 | else | |
1661 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1662 | break; |
4370aa4a | 1663 | } |
fef20d9c FW |
1664 | |
1665 | default: | |
1666 | switch (spec.type) { | |
1667 | ||
1668 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1669 | save_arg(long long); |
fef20d9c FW |
1670 | break; |
1671 | case FORMAT_TYPE_ULONG: | |
1672 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1673 | save_arg(unsigned long); |
fef20d9c FW |
1674 | break; |
1675 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1676 | save_arg(size_t); |
fef20d9c FW |
1677 | break; |
1678 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 1679 | save_arg(ptrdiff_t); |
fef20d9c | 1680 | break; |
a4e94ef0 Z |
1681 | case FORMAT_TYPE_UBYTE: |
1682 | case FORMAT_TYPE_BYTE: | |
1683 | save_arg(char); | |
1684 | break; | |
fef20d9c FW |
1685 | case FORMAT_TYPE_USHORT: |
1686 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 1687 | save_arg(short); |
fef20d9c FW |
1688 | break; |
1689 | default: | |
4370aa4a | 1690 | save_arg(int); |
fef20d9c | 1691 | } |
4370aa4a LJ |
1692 | } |
1693 | } | |
fef20d9c | 1694 | |
7b9186f5 | 1695 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 1696 | #undef save_arg |
4370aa4a LJ |
1697 | } |
1698 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1699 | ||
1700 | /** | |
1701 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1702 | * @buf: The buffer to place the result into | |
1703 | * @size: The size of the buffer, including the trailing null space | |
1704 | * @fmt: The format string to use | |
1705 | * @bin_buf: Binary arguments for the format string | |
1706 | * | |
1707 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1708 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1709 | * a binary buffer that generated by vbin_printf. | |
1710 | * | |
1711 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 1712 | * see vsnprintf comment for details. |
4370aa4a LJ |
1713 | * |
1714 | * The return value is the number of characters which would | |
1715 | * be generated for the given input, excluding the trailing | |
1716 | * '\0', as per ISO C99. If you want to have the exact | |
1717 | * number of characters written into @buf as return value | |
1718 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1719 | * return is greater than or equal to @size, the resulting | |
1720 | * string is truncated. | |
1721 | */ | |
1722 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1723 | { | |
fef20d9c | 1724 | struct printf_spec spec = {0}; |
d4be151b AGR |
1725 | char *str, *end; |
1726 | const char *args = (const char *)bin_buf; | |
4370aa4a | 1727 | |
2f30b1f9 | 1728 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 1729 | return 0; |
4370aa4a LJ |
1730 | |
1731 | str = buf; | |
1732 | end = buf + size; | |
1733 | ||
1734 | #define get_arg(type) \ | |
1735 | ({ \ | |
1736 | typeof(type) value; \ | |
1737 | if (sizeof(type) == 8) { \ | |
1738 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1739 | *(u32 *)&value = *(u32 *)args; \ | |
1740 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1741 | } else { \ | |
1742 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1743 | value = *(typeof(type) *)args; \ | |
1744 | } \ | |
1745 | args += sizeof(type); \ | |
1746 | value; \ | |
1747 | }) | |
1748 | ||
1749 | /* Make sure end is always >= buf */ | |
1750 | if (end < buf) { | |
1751 | end = ((void *)-1); | |
1752 | size = end - buf; | |
1753 | } | |
1754 | ||
fef20d9c | 1755 | while (*fmt) { |
fef20d9c | 1756 | const char *old_fmt = fmt; |
d4be151b | 1757 | int read = format_decode(fmt, &spec); |
4370aa4a | 1758 | |
fef20d9c | 1759 | fmt += read; |
4370aa4a | 1760 | |
fef20d9c FW |
1761 | switch (spec.type) { |
1762 | case FORMAT_TYPE_NONE: { | |
1763 | int copy = read; | |
1764 | if (str < end) { | |
1765 | if (copy > end - str) | |
1766 | copy = end - str; | |
1767 | memcpy(str, old_fmt, copy); | |
4370aa4a | 1768 | } |
fef20d9c FW |
1769 | str += read; |
1770 | break; | |
4370aa4a LJ |
1771 | } |
1772 | ||
ed681a91 | 1773 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1774 | spec.field_width = get_arg(int); |
1775 | break; | |
4370aa4a | 1776 | |
fef20d9c FW |
1777 | case FORMAT_TYPE_PRECISION: |
1778 | spec.precision = get_arg(int); | |
1779 | break; | |
4370aa4a | 1780 | |
d4be151b AGR |
1781 | case FORMAT_TYPE_CHAR: { |
1782 | char c; | |
1783 | ||
fef20d9c FW |
1784 | if (!(spec.flags & LEFT)) { |
1785 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
1786 | if (str < end) |
1787 | *str = ' '; | |
1788 | ++str; | |
1789 | } | |
1790 | } | |
1791 | c = (unsigned char) get_arg(char); | |
1792 | if (str < end) | |
1793 | *str = c; | |
1794 | ++str; | |
fef20d9c | 1795 | while (--spec.field_width > 0) { |
4370aa4a LJ |
1796 | if (str < end) |
1797 | *str = ' '; | |
1798 | ++str; | |
1799 | } | |
fef20d9c | 1800 | break; |
d4be151b | 1801 | } |
4370aa4a | 1802 | |
fef20d9c | 1803 | case FORMAT_TYPE_STR: { |
4370aa4a | 1804 | const char *str_arg = args; |
d4be151b | 1805 | args += strlen(str_arg) + 1; |
fef20d9c FW |
1806 | str = string(str, end, (char *)str_arg, spec); |
1807 | break; | |
4370aa4a LJ |
1808 | } |
1809 | ||
fef20d9c FW |
1810 | case FORMAT_TYPE_PTR: |
1811 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1812 | while (isalnum(*fmt)) | |
4370aa4a | 1813 | fmt++; |
fef20d9c | 1814 | break; |
4370aa4a | 1815 | |
fef20d9c | 1816 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 1817 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
1818 | if (str < end) |
1819 | *str = '%'; | |
1820 | ++str; | |
fef20d9c FW |
1821 | break; |
1822 | ||
1823 | case FORMAT_TYPE_NRCHARS: | |
1824 | /* skip */ | |
1825 | break; | |
1826 | ||
d4be151b AGR |
1827 | default: { |
1828 | unsigned long long num; | |
1829 | ||
fef20d9c FW |
1830 | switch (spec.type) { |
1831 | ||
1832 | case FORMAT_TYPE_LONG_LONG: | |
1833 | num = get_arg(long long); | |
1834 | break; | |
1835 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
1836 | case FORMAT_TYPE_LONG: |
1837 | num = get_arg(unsigned long); | |
1838 | break; | |
1839 | case FORMAT_TYPE_SIZE_T: | |
1840 | num = get_arg(size_t); | |
1841 | break; | |
1842 | case FORMAT_TYPE_PTRDIFF: | |
1843 | num = get_arg(ptrdiff_t); | |
1844 | break; | |
a4e94ef0 Z |
1845 | case FORMAT_TYPE_UBYTE: |
1846 | num = get_arg(unsigned char); | |
1847 | break; | |
1848 | case FORMAT_TYPE_BYTE: | |
1849 | num = get_arg(signed char); | |
1850 | break; | |
fef20d9c FW |
1851 | case FORMAT_TYPE_USHORT: |
1852 | num = get_arg(unsigned short); | |
1853 | break; | |
1854 | case FORMAT_TYPE_SHORT: | |
1855 | num = get_arg(short); | |
1856 | break; | |
1857 | case FORMAT_TYPE_UINT: | |
1858 | num = get_arg(unsigned int); | |
1859 | break; | |
1860 | default: | |
1861 | num = get_arg(int); | |
1862 | } | |
1863 | ||
1864 | str = number(str, end, num, spec); | |
d4be151b AGR |
1865 | } /* default: */ |
1866 | } /* switch(spec.type) */ | |
1867 | } /* while(*fmt) */ | |
fef20d9c | 1868 | |
4370aa4a LJ |
1869 | if (size > 0) { |
1870 | if (str < end) | |
1871 | *str = '\0'; | |
1872 | else | |
1873 | end[-1] = '\0'; | |
1874 | } | |
fef20d9c | 1875 | |
4370aa4a LJ |
1876 | #undef get_arg |
1877 | ||
1878 | /* the trailing null byte doesn't count towards the total */ | |
1879 | return str - buf; | |
1880 | } | |
1881 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1882 | ||
1883 | /** | |
1884 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1885 | * @bin_buf: The buffer to place args' binary value | |
1886 | * @size: The size of the buffer(by words(32bits), not characters) | |
1887 | * @fmt: The format string to use | |
1888 | * @...: Arguments for the format string | |
1889 | * | |
1890 | * The function returns the number of words(u32) written | |
1891 | * into @bin_buf. | |
1892 | */ | |
1893 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1894 | { | |
1895 | va_list args; | |
1896 | int ret; | |
1897 | ||
1898 | va_start(args, fmt); | |
1899 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1900 | va_end(args); | |
7b9186f5 | 1901 | |
4370aa4a LJ |
1902 | return ret; |
1903 | } | |
1904 | EXPORT_SYMBOL_GPL(bprintf); | |
1905 | ||
1906 | #endif /* CONFIG_BINARY_PRINTF */ | |
1907 | ||
1da177e4 LT |
1908 | /** |
1909 | * vsscanf - Unformat a buffer into a list of arguments | |
1910 | * @buf: input buffer | |
1911 | * @fmt: format of buffer | |
1912 | * @args: arguments | |
1913 | */ | |
7b9186f5 | 1914 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
1915 | { |
1916 | const char *str = buf; | |
1917 | char *next; | |
1918 | char digit; | |
1919 | int num = 0; | |
ef0658f3 JP |
1920 | u8 qualifier; |
1921 | u8 base; | |
1922 | s16 field_width; | |
d4be151b | 1923 | bool is_sign; |
1da177e4 | 1924 | |
7b9186f5 | 1925 | while (*fmt && *str) { |
1da177e4 LT |
1926 | /* skip any white space in format */ |
1927 | /* white space in format matchs any amount of | |
1928 | * white space, including none, in the input. | |
1929 | */ | |
1930 | if (isspace(*fmt)) { | |
e7d2860b AGR |
1931 | fmt = skip_spaces(++fmt); |
1932 | str = skip_spaces(str); | |
1da177e4 LT |
1933 | } |
1934 | ||
1935 | /* anything that is not a conversion must match exactly */ | |
1936 | if (*fmt != '%' && *fmt) { | |
1937 | if (*fmt++ != *str++) | |
1938 | break; | |
1939 | continue; | |
1940 | } | |
1941 | ||
1942 | if (!*fmt) | |
1943 | break; | |
1944 | ++fmt; | |
7b9186f5 | 1945 | |
1da177e4 LT |
1946 | /* skip this conversion. |
1947 | * advance both strings to next white space | |
1948 | */ | |
1949 | if (*fmt == '*') { | |
8fccae2c | 1950 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
1951 | fmt++; |
1952 | while (!isspace(*str) && *str) | |
1953 | str++; | |
1954 | continue; | |
1955 | } | |
1956 | ||
1957 | /* get field width */ | |
1958 | field_width = -1; | |
1959 | if (isdigit(*fmt)) | |
1960 | field_width = skip_atoi(&fmt); | |
1961 | ||
1962 | /* get conversion qualifier */ | |
1963 | qualifier = -1; | |
08562cb2 AGR |
1964 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1965 | TOLOWER(*fmt) == 'z') { | |
1da177e4 LT |
1966 | qualifier = *fmt++; |
1967 | if (unlikely(qualifier == *fmt)) { | |
1968 | if (qualifier == 'h') { | |
1969 | qualifier = 'H'; | |
1970 | fmt++; | |
1971 | } else if (qualifier == 'l') { | |
1972 | qualifier = 'L'; | |
1973 | fmt++; | |
1974 | } | |
1975 | } | |
1976 | } | |
1da177e4 LT |
1977 | |
1978 | if (!*fmt || !*str) | |
1979 | break; | |
1980 | ||
d4be151b AGR |
1981 | base = 10; |
1982 | is_sign = 0; | |
1983 | ||
7b9186f5 | 1984 | switch (*fmt++) { |
1da177e4 LT |
1985 | case 'c': |
1986 | { | |
7b9186f5 | 1987 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
1988 | if (field_width == -1) |
1989 | field_width = 1; | |
1990 | do { | |
1991 | *s++ = *str++; | |
1992 | } while (--field_width > 0 && *str); | |
1993 | num++; | |
1994 | } | |
1995 | continue; | |
1996 | case 's': | |
1997 | { | |
7b9186f5 AGR |
1998 | char *s = (char *)va_arg(args, char *); |
1999 | if (field_width == -1) | |
4be929be | 2000 | field_width = SHRT_MAX; |
1da177e4 | 2001 | /* first, skip leading white space in buffer */ |
e7d2860b | 2002 | str = skip_spaces(str); |
1da177e4 LT |
2003 | |
2004 | /* now copy until next white space */ | |
7b9186f5 | 2005 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2006 | *s++ = *str++; |
1da177e4 LT |
2007 | *s = '\0'; |
2008 | num++; | |
2009 | } | |
2010 | continue; | |
2011 | case 'n': | |
2012 | /* return number of characters read so far */ | |
2013 | { | |
7b9186f5 | 2014 | int *i = (int *)va_arg(args, int*); |
1da177e4 LT |
2015 | *i = str - buf; |
2016 | } | |
2017 | continue; | |
2018 | case 'o': | |
2019 | base = 8; | |
2020 | break; | |
2021 | case 'x': | |
2022 | case 'X': | |
2023 | base = 16; | |
2024 | break; | |
2025 | case 'i': | |
7b9186f5 | 2026 | base = 0; |
1da177e4 LT |
2027 | case 'd': |
2028 | is_sign = 1; | |
2029 | case 'u': | |
2030 | break; | |
2031 | case '%': | |
2032 | /* looking for '%' in str */ | |
7b9186f5 | 2033 | if (*str++ != '%') |
1da177e4 LT |
2034 | return num; |
2035 | continue; | |
2036 | default: | |
2037 | /* invalid format; stop here */ | |
2038 | return num; | |
2039 | } | |
2040 | ||
2041 | /* have some sort of integer conversion. | |
2042 | * first, skip white space in buffer. | |
2043 | */ | |
e7d2860b | 2044 | str = skip_spaces(str); |
1da177e4 LT |
2045 | |
2046 | digit = *str; | |
2047 | if (is_sign && digit == '-') | |
2048 | digit = *(str + 1); | |
2049 | ||
2050 | if (!digit | |
7b9186f5 AGR |
2051 | || (base == 16 && !isxdigit(digit)) |
2052 | || (base == 10 && !isdigit(digit)) | |
2053 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2054 | || (base == 0 && !isdigit(digit))) | |
2055 | break; | |
1da177e4 | 2056 | |
7b9186f5 | 2057 | switch (qualifier) { |
1da177e4 LT |
2058 | case 'H': /* that's 'hh' in format */ |
2059 | if (is_sign) { | |
7b9186f5 AGR |
2060 | signed char *s = (signed char *)va_arg(args, signed char *); |
2061 | *s = (signed char)simple_strtol(str, &next, base); | |
1da177e4 | 2062 | } else { |
7b9186f5 AGR |
2063 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); |
2064 | *s = (unsigned char)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2065 | } |
2066 | break; | |
2067 | case 'h': | |
2068 | if (is_sign) { | |
7b9186f5 AGR |
2069 | short *s = (short *)va_arg(args, short *); |
2070 | *s = (short)simple_strtol(str, &next, base); | |
1da177e4 | 2071 | } else { |
7b9186f5 AGR |
2072 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); |
2073 | *s = (unsigned short)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2074 | } |
2075 | break; | |
2076 | case 'l': | |
2077 | if (is_sign) { | |
7b9186f5 AGR |
2078 | long *l = (long *)va_arg(args, long *); |
2079 | *l = simple_strtol(str, &next, base); | |
1da177e4 | 2080 | } else { |
7b9186f5 AGR |
2081 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); |
2082 | *l = simple_strtoul(str, &next, base); | |
1da177e4 LT |
2083 | } |
2084 | break; | |
2085 | case 'L': | |
2086 | if (is_sign) { | |
7b9186f5 AGR |
2087 | long long *l = (long long *)va_arg(args, long long *); |
2088 | *l = simple_strtoll(str, &next, base); | |
1da177e4 | 2089 | } else { |
7b9186f5 AGR |
2090 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); |
2091 | *l = simple_strtoull(str, &next, base); | |
1da177e4 LT |
2092 | } |
2093 | break; | |
2094 | case 'Z': | |
2095 | case 'z': | |
2096 | { | |
7b9186f5 AGR |
2097 | size_t *s = (size_t *)va_arg(args, size_t *); |
2098 | *s = (size_t)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2099 | } |
2100 | break; | |
2101 | default: | |
2102 | if (is_sign) { | |
7b9186f5 AGR |
2103 | int *i = (int *)va_arg(args, int *); |
2104 | *i = (int)simple_strtol(str, &next, base); | |
1da177e4 | 2105 | } else { |
7b9186f5 AGR |
2106 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); |
2107 | *i = (unsigned int)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2108 | } |
2109 | break; | |
2110 | } | |
2111 | num++; | |
2112 | ||
2113 | if (!next) | |
2114 | break; | |
2115 | str = next; | |
2116 | } | |
c6b40d16 JB |
2117 | |
2118 | /* | |
2119 | * Now we've come all the way through so either the input string or the | |
2120 | * format ended. In the former case, there can be a %n at the current | |
2121 | * position in the format that needs to be filled. | |
2122 | */ | |
2123 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
2124 | int *p = (int *)va_arg(args, int *); | |
2125 | *p = str - buf; | |
2126 | } | |
2127 | ||
1da177e4 LT |
2128 | return num; |
2129 | } | |
1da177e4 LT |
2130 | EXPORT_SYMBOL(vsscanf); |
2131 | ||
2132 | /** | |
2133 | * sscanf - Unformat a buffer into a list of arguments | |
2134 | * @buf: input buffer | |
2135 | * @fmt: formatting of buffer | |
2136 | * @...: resulting arguments | |
2137 | */ | |
7b9186f5 | 2138 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2139 | { |
2140 | va_list args; | |
2141 | int i; | |
2142 | ||
7b9186f5 AGR |
2143 | va_start(args, fmt); |
2144 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2145 | va_end(args); |
7b9186f5 | 2146 | |
1da177e4 LT |
2147 | return i; |
2148 | } | |
1da177e4 | 2149 | EXPORT_SYMBOL(sscanf); |