Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
12 | /* | |
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> | |
25 | ||
4e57b681 | 26 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 LT |
27 | #include <asm/div64.h> |
28 | ||
9b706aee DV |
29 | /* Works only for digits and letters, but small and fast */ |
30 | #define TOLOWER(x) ((x) | 0x20) | |
31 | ||
1da177e4 LT |
32 | /** |
33 | * simple_strtoul - convert a string to an unsigned long | |
34 | * @cp: The start of the string | |
35 | * @endp: A pointer to the end of the parsed string will be placed here | |
36 | * @base: The number base to use | |
37 | */ | |
38 | unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base) | |
39 | { | |
40 | unsigned long result = 0,value; | |
41 | ||
42 | if (!base) { | |
43 | base = 10; | |
44 | if (*cp == '0') { | |
45 | base = 8; | |
46 | cp++; | |
9b706aee | 47 | if ((TOLOWER(*cp) == 'x') && isxdigit(cp[1])) { |
1da177e4 LT |
48 | cp++; |
49 | base = 16; | |
50 | } | |
51 | } | |
52 | } else if (base == 16) { | |
9b706aee | 53 | if (cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
1da177e4 LT |
54 | cp += 2; |
55 | } | |
56 | while (isxdigit(*cp) && | |
9b706aee | 57 | (value = isdigit(*cp) ? *cp-'0' : TOLOWER(*cp)-'a'+10) < base) { |
1da177e4 LT |
58 | result = result*base + value; |
59 | cp++; | |
60 | } | |
61 | if (endp) | |
62 | *endp = (char *)cp; | |
63 | return result; | |
64 | } | |
65 | ||
66 | EXPORT_SYMBOL(simple_strtoul); | |
67 | ||
68 | /** | |
69 | * simple_strtol - convert a string to a signed long | |
70 | * @cp: The start of the string | |
71 | * @endp: A pointer to the end of the parsed string will be placed here | |
72 | * @base: The number base to use | |
73 | */ | |
74 | long simple_strtol(const char *cp,char **endp,unsigned int base) | |
75 | { | |
76 | if(*cp=='-') | |
77 | return -simple_strtoul(cp+1,endp,base); | |
78 | return simple_strtoul(cp,endp,base); | |
79 | } | |
80 | ||
81 | EXPORT_SYMBOL(simple_strtol); | |
82 | ||
83 | /** | |
84 | * simple_strtoull - convert a string to an unsigned long long | |
85 | * @cp: The start of the string | |
86 | * @endp: A pointer to the end of the parsed string will be placed here | |
87 | * @base: The number base to use | |
88 | */ | |
89 | unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base) | |
90 | { | |
91 | unsigned long long result = 0,value; | |
92 | ||
93 | if (!base) { | |
94 | base = 10; | |
95 | if (*cp == '0') { | |
96 | base = 8; | |
97 | cp++; | |
9b706aee | 98 | if ((TOLOWER(*cp) == 'x') && isxdigit(cp[1])) { |
1da177e4 LT |
99 | cp++; |
100 | base = 16; | |
101 | } | |
102 | } | |
103 | } else if (base == 16) { | |
9b706aee | 104 | if (cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
1da177e4 LT |
105 | cp += 2; |
106 | } | |
9b706aee DV |
107 | while (isxdigit(*cp) |
108 | && (value = isdigit(*cp) ? *cp-'0' : TOLOWER(*cp)-'a'+10) < base) { | |
1da177e4 LT |
109 | result = result*base + value; |
110 | cp++; | |
111 | } | |
112 | if (endp) | |
113 | *endp = (char *)cp; | |
114 | return result; | |
115 | } | |
116 | ||
117 | EXPORT_SYMBOL(simple_strtoull); | |
118 | ||
119 | /** | |
120 | * simple_strtoll - convert a string to a signed long long | |
121 | * @cp: The start of the string | |
122 | * @endp: A pointer to the end of the parsed string will be placed here | |
123 | * @base: The number base to use | |
124 | */ | |
125 | long long simple_strtoll(const char *cp,char **endp,unsigned int base) | |
126 | { | |
127 | if(*cp=='-') | |
128 | return -simple_strtoull(cp+1,endp,base); | |
129 | return simple_strtoull(cp,endp,base); | |
130 | } | |
131 | ||
06b2a76d YY |
132 | |
133 | /** | |
134 | * strict_strtoul - convert a string to an unsigned long strictly | |
135 | * @cp: The string to be converted | |
136 | * @base: The number base to use | |
137 | * @res: The converted result value | |
138 | * | |
139 | * strict_strtoul converts a string to an unsigned long only if the | |
140 | * string is really an unsigned long string, any string containing | |
141 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
142 | * only a newline char at the tail is acceptible because people generally | |
143 | * change a module parameter in the following way: | |
144 | * | |
145 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
146 | * | |
147 | * echo will append a newline to the tail. | |
148 | * | |
149 | * It returns 0 if conversion is successful and *res is set to the converted | |
150 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
151 | * | |
152 | * simple_strtoul just ignores the successive invalid characters and | |
153 | * return the converted value of prefix part of the string. | |
154 | */ | |
155 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res); | |
156 | ||
157 | /** | |
158 | * strict_strtol - convert a string to a long strictly | |
159 | * @cp: The string to be converted | |
160 | * @base: The number base to use | |
161 | * @res: The converted result value | |
162 | * | |
163 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
164 | * character of a string is '-'. | |
165 | * | |
166 | * It returns 0 if conversion is successful and *res is set to the converted | |
167 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
168 | */ | |
169 | int strict_strtol(const char *cp, unsigned int base, long *res); | |
170 | ||
171 | /** | |
172 | * strict_strtoull - convert a string to an unsigned long long strictly | |
173 | * @cp: The string to be converted | |
174 | * @base: The number base to use | |
175 | * @res: The converted result value | |
176 | * | |
177 | * strict_strtoull converts a string to an unsigned long long only if the | |
178 | * string is really an unsigned long long string, any string containing | |
179 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
180 | * only a newline char at the tail is acceptible because people generally | |
181 | * change a module parameter in the following way: | |
182 | * | |
183 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
184 | * | |
185 | * echo will append a newline to the tail of the string. | |
186 | * | |
187 | * It returns 0 if conversion is successful and *res is set to the converted | |
188 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
189 | * | |
190 | * simple_strtoull just ignores the successive invalid characters and | |
191 | * return the converted value of prefix part of the string. | |
192 | */ | |
193 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res); | |
194 | ||
195 | /** | |
196 | * strict_strtoll - convert a string to a long long strictly | |
197 | * @cp: The string to be converted | |
198 | * @base: The number base to use | |
199 | * @res: The converted result value | |
200 | * | |
201 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
202 | * character of a string is '-'. | |
203 | * | |
204 | * It returns 0 if conversion is successful and *res is set to the converted | |
205 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
206 | */ | |
207 | int strict_strtoll(const char *cp, unsigned int base, long long *res); | |
208 | ||
209 | #define define_strict_strtoux(type, valtype) \ | |
210 | int strict_strtou##type(const char *cp, unsigned int base, valtype *res)\ | |
211 | { \ | |
212 | char *tail; \ | |
213 | valtype val; \ | |
214 | size_t len; \ | |
215 | \ | |
216 | *res = 0; \ | |
217 | len = strlen(cp); \ | |
218 | if (len == 0) \ | |
219 | return -EINVAL; \ | |
220 | \ | |
221 | val = simple_strtoul(cp, &tail, base); \ | |
222 | if ((*tail == '\0') || \ | |
223 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {\ | |
224 | *res = val; \ | |
225 | return 0; \ | |
226 | } \ | |
227 | \ | |
228 | return -EINVAL; \ | |
229 | } \ | |
230 | ||
231 | #define define_strict_strtox(type, valtype) \ | |
232 | int strict_strto##type(const char *cp, unsigned int base, valtype *res) \ | |
233 | { \ | |
234 | int ret; \ | |
235 | if (*cp == '-') { \ | |
236 | ret = strict_strtou##type(cp+1, base, res); \ | |
4f9d5f4a | 237 | if (!ret) \ |
06b2a76d YY |
238 | *res = -(*res); \ |
239 | } else \ | |
240 | ret = strict_strtou##type(cp, base, res); \ | |
241 | \ | |
242 | return ret; \ | |
243 | } \ | |
244 | ||
245 | define_strict_strtoux(l, unsigned long) | |
246 | define_strict_strtox(l, long) | |
247 | define_strict_strtoux(ll, unsigned long long) | |
248 | define_strict_strtox(ll, long long) | |
249 | ||
250 | EXPORT_SYMBOL(strict_strtoul); | |
251 | EXPORT_SYMBOL(strict_strtol); | |
252 | EXPORT_SYMBOL(strict_strtoll); | |
253 | EXPORT_SYMBOL(strict_strtoull); | |
254 | ||
1da177e4 LT |
255 | static int skip_atoi(const char **s) |
256 | { | |
257 | int i=0; | |
258 | ||
259 | while (isdigit(**s)) | |
260 | i = i*10 + *((*s)++) - '0'; | |
261 | return i; | |
262 | } | |
263 | ||
4277eedd DV |
264 | /* Decimal conversion is by far the most typical, and is used |
265 | * for /proc and /sys data. This directly impacts e.g. top performance | |
266 | * with many processes running. We optimize it for speed | |
267 | * using code from | |
268 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
269 | * (with permission from the author, Douglas W. Jones). */ | |
270 | ||
271 | /* Formats correctly any integer in [0,99999]. | |
272 | * Outputs from one to five digits depending on input. | |
273 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
274 | static char* put_dec_trunc(char *buf, unsigned q) | |
275 | { | |
276 | unsigned d3, d2, d1, d0; | |
277 | d1 = (q>>4) & 0xf; | |
278 | d2 = (q>>8) & 0xf; | |
279 | d3 = (q>>12); | |
280 | ||
281 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
282 | q = (d0 * 0xcd) >> 11; | |
283 | d0 = d0 - 10*q; | |
284 | *buf++ = d0 + '0'; /* least significant digit */ | |
285 | d1 = q + 9*d3 + 5*d2 + d1; | |
286 | if (d1 != 0) { | |
287 | q = (d1 * 0xcd) >> 11; | |
288 | d1 = d1 - 10*q; | |
289 | *buf++ = d1 + '0'; /* next digit */ | |
290 | ||
291 | d2 = q + 2*d2; | |
292 | if ((d2 != 0) || (d3 != 0)) { | |
293 | q = (d2 * 0xd) >> 7; | |
294 | d2 = d2 - 10*q; | |
295 | *buf++ = d2 + '0'; /* next digit */ | |
296 | ||
297 | d3 = q + 4*d3; | |
298 | if (d3 != 0) { | |
299 | q = (d3 * 0xcd) >> 11; | |
300 | d3 = d3 - 10*q; | |
301 | *buf++ = d3 + '0'; /* next digit */ | |
302 | if (q != 0) | |
303 | *buf++ = q + '0'; /* most sign. digit */ | |
304 | } | |
305 | } | |
306 | } | |
307 | return buf; | |
308 | } | |
309 | /* Same with if's removed. Always emits five digits */ | |
310 | static char* put_dec_full(char *buf, unsigned q) | |
311 | { | |
312 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
313 | /* but anyway, gcc produces better code with full-sized ints */ | |
314 | unsigned d3, d2, d1, d0; | |
315 | d1 = (q>>4) & 0xf; | |
316 | d2 = (q>>8) & 0xf; | |
317 | d3 = (q>>12); | |
318 | ||
319 | /* Possible ways to approx. divide by 10 */ | |
320 | /* gcc -O2 replaces multiply with shifts and adds */ | |
321 | // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
322 | // (x * 0x67) >> 10: 1100111 | |
323 | // (x * 0x34) >> 9: 110100 - same | |
324 | // (x * 0x1a) >> 8: 11010 - same | |
325 | // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
326 | ||
327 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
328 | q = (d0 * 0xcd) >> 11; | |
329 | d0 = d0 - 10*q; | |
330 | *buf++ = d0 + '0'; | |
331 | d1 = q + 9*d3 + 5*d2 + d1; | |
332 | q = (d1 * 0xcd) >> 11; | |
333 | d1 = d1 - 10*q; | |
334 | *buf++ = d1 + '0'; | |
335 | ||
336 | d2 = q + 2*d2; | |
337 | q = (d2 * 0xd) >> 7; | |
338 | d2 = d2 - 10*q; | |
339 | *buf++ = d2 + '0'; | |
340 | ||
341 | d3 = q + 4*d3; | |
342 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
343 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
344 | d3 = d3 - 10*q; | |
345 | *buf++ = d3 + '0'; | |
346 | *buf++ = q + '0'; | |
347 | return buf; | |
348 | } | |
349 | /* No inlining helps gcc to use registers better */ | |
350 | static noinline char* put_dec(char *buf, unsigned long long num) | |
351 | { | |
352 | while (1) { | |
353 | unsigned rem; | |
354 | if (num < 100000) | |
355 | return put_dec_trunc(buf, num); | |
356 | rem = do_div(num, 100000); | |
357 | buf = put_dec_full(buf, rem); | |
358 | } | |
359 | } | |
360 | ||
1da177e4 LT |
361 | #define ZEROPAD 1 /* pad with zero */ |
362 | #define SIGN 2 /* unsigned/signed long */ | |
363 | #define PLUS 4 /* show plus */ | |
364 | #define SPACE 8 /* space if plus */ | |
365 | #define LEFT 16 /* left justified */ | |
9b706aee DV |
366 | #define SMALL 32 /* Must be 32 == 0x20 */ |
367 | #define SPECIAL 64 /* 0x */ | |
1da177e4 | 368 | |
b39a7340 | 369 | static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type) |
1da177e4 | 370 | { |
9b706aee DV |
371 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
372 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
373 | ||
374 | char tmp[66]; | |
375 | char sign; | |
376 | char locase; | |
b39a7340 | 377 | int need_pfx = ((type & SPECIAL) && base != 10); |
1da177e4 LT |
378 | int i; |
379 | ||
9b706aee DV |
380 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
381 | * produces same digits or (maybe lowercased) letters */ | |
382 | locase = (type & SMALL); | |
1da177e4 LT |
383 | if (type & LEFT) |
384 | type &= ~ZEROPAD; | |
1da177e4 LT |
385 | sign = 0; |
386 | if (type & SIGN) { | |
387 | if ((signed long long) num < 0) { | |
388 | sign = '-'; | |
389 | num = - (signed long long) num; | |
390 | size--; | |
391 | } else if (type & PLUS) { | |
392 | sign = '+'; | |
393 | size--; | |
394 | } else if (type & SPACE) { | |
395 | sign = ' '; | |
396 | size--; | |
397 | } | |
398 | } | |
b39a7340 DV |
399 | if (need_pfx) { |
400 | size--; | |
1da177e4 | 401 | if (base == 16) |
1da177e4 LT |
402 | size--; |
403 | } | |
b39a7340 DV |
404 | |
405 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
406 | i = 0; |
407 | if (num == 0) | |
b39a7340 | 408 | tmp[i++] = '0'; |
4277eedd DV |
409 | /* Generic code, for any base: |
410 | else do { | |
9b706aee | 411 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
412 | } while (num != 0); |
413 | */ | |
b39a7340 DV |
414 | else if (base != 10) { /* 8 or 16 */ |
415 | int mask = base - 1; | |
416 | int shift = 3; | |
417 | if (base == 16) shift = 4; | |
418 | do { | |
9b706aee | 419 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
420 | num >>= shift; |
421 | } while (num); | |
4277eedd DV |
422 | } else { /* base 10 */ |
423 | i = put_dec(tmp, num) - tmp; | |
424 | } | |
b39a7340 DV |
425 | |
426 | /* printing 100 using %2d gives "100", not "00" */ | |
1da177e4 LT |
427 | if (i > precision) |
428 | precision = i; | |
b39a7340 | 429 | /* leading space padding */ |
1da177e4 | 430 | size -= precision; |
b39a7340 DV |
431 | if (!(type & (ZEROPAD+LEFT))) { |
432 | while(--size >= 0) { | |
f796937a | 433 | if (buf < end) |
1da177e4 LT |
434 | *buf = ' '; |
435 | ++buf; | |
436 | } | |
437 | } | |
b39a7340 | 438 | /* sign */ |
1da177e4 | 439 | if (sign) { |
f796937a | 440 | if (buf < end) |
1da177e4 LT |
441 | *buf = sign; |
442 | ++buf; | |
443 | } | |
b39a7340 DV |
444 | /* "0x" / "0" prefix */ |
445 | if (need_pfx) { | |
446 | if (buf < end) | |
447 | *buf = '0'; | |
448 | ++buf; | |
449 | if (base == 16) { | |
f796937a | 450 | if (buf < end) |
9b706aee | 451 | *buf = ('X' | locase); |
1da177e4 LT |
452 | ++buf; |
453 | } | |
454 | } | |
b39a7340 | 455 | /* zero or space padding */ |
1da177e4 | 456 | if (!(type & LEFT)) { |
b39a7340 DV |
457 | char c = (type & ZEROPAD) ? '0' : ' '; |
458 | while (--size >= 0) { | |
f796937a | 459 | if (buf < end) |
1da177e4 LT |
460 | *buf = c; |
461 | ++buf; | |
462 | } | |
463 | } | |
b39a7340 DV |
464 | /* hmm even more zero padding? */ |
465 | while (i <= --precision) { | |
f796937a | 466 | if (buf < end) |
1da177e4 LT |
467 | *buf = '0'; |
468 | ++buf; | |
469 | } | |
b39a7340 DV |
470 | /* actual digits of result */ |
471 | while (--i >= 0) { | |
f796937a | 472 | if (buf < end) |
1da177e4 LT |
473 | *buf = tmp[i]; |
474 | ++buf; | |
475 | } | |
b39a7340 DV |
476 | /* trailing space padding */ |
477 | while (--size >= 0) { | |
f796937a | 478 | if (buf < end) |
1da177e4 LT |
479 | *buf = ' '; |
480 | ++buf; | |
481 | } | |
482 | return buf; | |
483 | } | |
484 | ||
0f9bfa56 LT |
485 | static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags) |
486 | { | |
487 | int len, i; | |
488 | ||
489 | if ((unsigned long)s < PAGE_SIZE) | |
490 | s = "<NULL>"; | |
491 | ||
492 | len = strnlen(s, precision); | |
493 | ||
494 | if (!(flags & LEFT)) { | |
495 | while (len < field_width--) { | |
496 | if (buf < end) | |
497 | *buf = ' '; | |
498 | ++buf; | |
499 | } | |
500 | } | |
501 | for (i = 0; i < len; ++i) { | |
502 | if (buf < end) | |
503 | *buf = *s; | |
504 | ++buf; ++s; | |
505 | } | |
506 | while (len < field_width--) { | |
507 | if (buf < end) | |
508 | *buf = ' '; | |
509 | ++buf; | |
510 | } | |
511 | return buf; | |
512 | } | |
513 | ||
78a8bf69 LT |
514 | static char *pointer(char *buf, char *end, void *ptr, int field_width, int precision, int flags) |
515 | { | |
516 | flags |= SMALL; | |
517 | if (field_width == -1) { | |
518 | field_width = 2*sizeof(void *); | |
519 | flags |= ZEROPAD; | |
520 | } | |
521 | return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags); | |
522 | } | |
523 | ||
1da177e4 LT |
524 | /** |
525 | * vsnprintf - Format a string and place it in a buffer | |
526 | * @buf: The buffer to place the result into | |
527 | * @size: The size of the buffer, including the trailing null space | |
528 | * @fmt: The format string to use | |
529 | * @args: Arguments for the format string | |
530 | * | |
531 | * The return value is the number of characters which would | |
532 | * be generated for the given input, excluding the trailing | |
533 | * '\0', as per ISO C99. If you want to have the exact | |
534 | * number of characters written into @buf as return value | |
72fd4a35 | 535 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
536 | * return is greater than or equal to @size, the resulting |
537 | * string is truncated. | |
538 | * | |
539 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 540 | * You probably want snprintf() instead. |
1da177e4 LT |
541 | */ |
542 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
543 | { | |
1da177e4 | 544 | unsigned long long num; |
0f9bfa56 | 545 | int base; |
1da177e4 | 546 | char *str, *end, c; |
1da177e4 LT |
547 | |
548 | int flags; /* flags to number() */ | |
549 | ||
550 | int field_width; /* width of output field */ | |
551 | int precision; /* min. # of digits for integers; max | |
552 | number of chars for from string */ | |
553 | int qualifier; /* 'h', 'l', or 'L' for integer fields */ | |
554 | /* 'z' support added 23/7/1999 S.H. */ | |
555 | /* 'z' changed to 'Z' --davidm 1/25/99 */ | |
80322306 | 556 | /* 't' added for ptrdiff_t */ |
1da177e4 | 557 | |
f796937a JF |
558 | /* Reject out-of-range values early. Large positive sizes are |
559 | used for unknown buffer sizes. */ | |
1da177e4 LT |
560 | if (unlikely((int) size < 0)) { |
561 | /* There can be only one.. */ | |
b39a7340 | 562 | static char warn = 1; |
1da177e4 LT |
563 | WARN_ON(warn); |
564 | warn = 0; | |
565 | return 0; | |
566 | } | |
567 | ||
568 | str = buf; | |
f796937a | 569 | end = buf + size; |
1da177e4 | 570 | |
f796937a JF |
571 | /* Make sure end is always >= buf */ |
572 | if (end < buf) { | |
573 | end = ((void *)-1); | |
574 | size = end - buf; | |
1da177e4 LT |
575 | } |
576 | ||
577 | for (; *fmt ; ++fmt) { | |
578 | if (*fmt != '%') { | |
f796937a | 579 | if (str < end) |
1da177e4 LT |
580 | *str = *fmt; |
581 | ++str; | |
582 | continue; | |
583 | } | |
584 | ||
585 | /* process flags */ | |
586 | flags = 0; | |
587 | repeat: | |
588 | ++fmt; /* this also skips first '%' */ | |
589 | switch (*fmt) { | |
590 | case '-': flags |= LEFT; goto repeat; | |
591 | case '+': flags |= PLUS; goto repeat; | |
592 | case ' ': flags |= SPACE; goto repeat; | |
593 | case '#': flags |= SPECIAL; goto repeat; | |
594 | case '0': flags |= ZEROPAD; goto repeat; | |
595 | } | |
596 | ||
597 | /* get field width */ | |
598 | field_width = -1; | |
599 | if (isdigit(*fmt)) | |
600 | field_width = skip_atoi(&fmt); | |
601 | else if (*fmt == '*') { | |
602 | ++fmt; | |
603 | /* it's the next argument */ | |
604 | field_width = va_arg(args, int); | |
605 | if (field_width < 0) { | |
606 | field_width = -field_width; | |
607 | flags |= LEFT; | |
608 | } | |
609 | } | |
610 | ||
611 | /* get the precision */ | |
612 | precision = -1; | |
613 | if (*fmt == '.') { | |
614 | ++fmt; | |
615 | if (isdigit(*fmt)) | |
616 | precision = skip_atoi(&fmt); | |
617 | else if (*fmt == '*') { | |
618 | ++fmt; | |
619 | /* it's the next argument */ | |
620 | precision = va_arg(args, int); | |
621 | } | |
622 | if (precision < 0) | |
623 | precision = 0; | |
624 | } | |
625 | ||
626 | /* get the conversion qualifier */ | |
627 | qualifier = -1; | |
628 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
80322306 | 629 | *fmt =='Z' || *fmt == 'z' || *fmt == 't') { |
1da177e4 LT |
630 | qualifier = *fmt; |
631 | ++fmt; | |
632 | if (qualifier == 'l' && *fmt == 'l') { | |
633 | qualifier = 'L'; | |
634 | ++fmt; | |
635 | } | |
636 | } | |
637 | ||
638 | /* default base */ | |
639 | base = 10; | |
640 | ||
641 | switch (*fmt) { | |
642 | case 'c': | |
643 | if (!(flags & LEFT)) { | |
644 | while (--field_width > 0) { | |
f796937a | 645 | if (str < end) |
1da177e4 LT |
646 | *str = ' '; |
647 | ++str; | |
648 | } | |
649 | } | |
650 | c = (unsigned char) va_arg(args, int); | |
f796937a | 651 | if (str < end) |
1da177e4 LT |
652 | *str = c; |
653 | ++str; | |
654 | while (--field_width > 0) { | |
f796937a | 655 | if (str < end) |
1da177e4 LT |
656 | *str = ' '; |
657 | ++str; | |
658 | } | |
659 | continue; | |
660 | ||
661 | case 's': | |
0f9bfa56 | 662 | str = string(str, end, va_arg(args, char *), field_width, precision, flags); |
1da177e4 LT |
663 | continue; |
664 | ||
665 | case 'p': | |
78a8bf69 | 666 | str = pointer(str, end, va_arg(args, void *), field_width, precision, flags); |
1da177e4 LT |
667 | continue; |
668 | ||
1da177e4 LT |
669 | case 'n': |
670 | /* FIXME: | |
671 | * What does C99 say about the overflow case here? */ | |
672 | if (qualifier == 'l') { | |
673 | long * ip = va_arg(args, long *); | |
674 | *ip = (str - buf); | |
675 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
676 | size_t * ip = va_arg(args, size_t *); | |
677 | *ip = (str - buf); | |
678 | } else { | |
679 | int * ip = va_arg(args, int *); | |
680 | *ip = (str - buf); | |
681 | } | |
682 | continue; | |
683 | ||
684 | case '%': | |
f796937a | 685 | if (str < end) |
1da177e4 LT |
686 | *str = '%'; |
687 | ++str; | |
688 | continue; | |
689 | ||
690 | /* integer number formats - set up the flags and "break" */ | |
691 | case 'o': | |
692 | base = 8; | |
693 | break; | |
694 | ||
1da177e4 | 695 | case 'x': |
9b706aee DV |
696 | flags |= SMALL; |
697 | case 'X': | |
1da177e4 LT |
698 | base = 16; |
699 | break; | |
700 | ||
701 | case 'd': | |
702 | case 'i': | |
703 | flags |= SIGN; | |
704 | case 'u': | |
705 | break; | |
706 | ||
707 | default: | |
f796937a | 708 | if (str < end) |
1da177e4 LT |
709 | *str = '%'; |
710 | ++str; | |
711 | if (*fmt) { | |
f796937a | 712 | if (str < end) |
1da177e4 LT |
713 | *str = *fmt; |
714 | ++str; | |
715 | } else { | |
716 | --fmt; | |
717 | } | |
718 | continue; | |
719 | } | |
720 | if (qualifier == 'L') | |
721 | num = va_arg(args, long long); | |
722 | else if (qualifier == 'l') { | |
723 | num = va_arg(args, unsigned long); | |
724 | if (flags & SIGN) | |
725 | num = (signed long) num; | |
726 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
727 | num = va_arg(args, size_t); | |
80322306 AV |
728 | } else if (qualifier == 't') { |
729 | num = va_arg(args, ptrdiff_t); | |
1da177e4 LT |
730 | } else if (qualifier == 'h') { |
731 | num = (unsigned short) va_arg(args, int); | |
732 | if (flags & SIGN) | |
733 | num = (signed short) num; | |
734 | } else { | |
735 | num = va_arg(args, unsigned int); | |
736 | if (flags & SIGN) | |
737 | num = (signed int) num; | |
738 | } | |
739 | str = number(str, end, num, base, | |
740 | field_width, precision, flags); | |
741 | } | |
f796937a JF |
742 | if (size > 0) { |
743 | if (str < end) | |
744 | *str = '\0'; | |
745 | else | |
0a6047ee | 746 | end[-1] = '\0'; |
f796937a JF |
747 | } |
748 | /* the trailing null byte doesn't count towards the total */ | |
1da177e4 LT |
749 | return str-buf; |
750 | } | |
751 | ||
752 | EXPORT_SYMBOL(vsnprintf); | |
753 | ||
754 | /** | |
755 | * vscnprintf - Format a string and place it in a buffer | |
756 | * @buf: The buffer to place the result into | |
757 | * @size: The size of the buffer, including the trailing null space | |
758 | * @fmt: The format string to use | |
759 | * @args: Arguments for the format string | |
760 | * | |
761 | * The return value is the number of characters which have been written into | |
762 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
763 | * returns 0. | |
764 | * | |
765 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 766 | * You probably want scnprintf() instead. |
1da177e4 LT |
767 | */ |
768 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
769 | { | |
770 | int i; | |
771 | ||
772 | i=vsnprintf(buf,size,fmt,args); | |
773 | return (i >= size) ? (size - 1) : i; | |
774 | } | |
775 | ||
776 | EXPORT_SYMBOL(vscnprintf); | |
777 | ||
778 | /** | |
779 | * snprintf - Format a string and place it in a buffer | |
780 | * @buf: The buffer to place the result into | |
781 | * @size: The size of the buffer, including the trailing null space | |
782 | * @fmt: The format string to use | |
783 | * @...: Arguments for the format string | |
784 | * | |
785 | * The return value is the number of characters which would be | |
786 | * generated for the given input, excluding the trailing null, | |
787 | * as per ISO C99. If the return is greater than or equal to | |
788 | * @size, the resulting string is truncated. | |
789 | */ | |
790 | int snprintf(char * buf, size_t size, const char *fmt, ...) | |
791 | { | |
792 | va_list args; | |
793 | int i; | |
794 | ||
795 | va_start(args, fmt); | |
796 | i=vsnprintf(buf,size,fmt,args); | |
797 | va_end(args); | |
798 | return i; | |
799 | } | |
800 | ||
801 | EXPORT_SYMBOL(snprintf); | |
802 | ||
803 | /** | |
804 | * scnprintf - Format a string and place it in a buffer | |
805 | * @buf: The buffer to place the result into | |
806 | * @size: The size of the buffer, including the trailing null space | |
807 | * @fmt: The format string to use | |
808 | * @...: Arguments for the format string | |
809 | * | |
810 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 811 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
812 | */ |
813 | ||
814 | int scnprintf(char * buf, size_t size, const char *fmt, ...) | |
815 | { | |
816 | va_list args; | |
817 | int i; | |
818 | ||
819 | va_start(args, fmt); | |
820 | i = vsnprintf(buf, size, fmt, args); | |
821 | va_end(args); | |
822 | return (i >= size) ? (size - 1) : i; | |
823 | } | |
824 | EXPORT_SYMBOL(scnprintf); | |
825 | ||
826 | /** | |
827 | * vsprintf - Format a string and place it in a buffer | |
828 | * @buf: The buffer to place the result into | |
829 | * @fmt: The format string to use | |
830 | * @args: Arguments for the format string | |
831 | * | |
832 | * The function returns the number of characters written | |
72fd4a35 | 833 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
834 | * buffer overflows. |
835 | * | |
836 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 837 | * You probably want sprintf() instead. |
1da177e4 LT |
838 | */ |
839 | int vsprintf(char *buf, const char *fmt, va_list args) | |
840 | { | |
841 | return vsnprintf(buf, INT_MAX, fmt, args); | |
842 | } | |
843 | ||
844 | EXPORT_SYMBOL(vsprintf); | |
845 | ||
846 | /** | |
847 | * sprintf - Format a string and place it in a buffer | |
848 | * @buf: The buffer to place the result into | |
849 | * @fmt: The format string to use | |
850 | * @...: Arguments for the format string | |
851 | * | |
852 | * The function returns the number of characters written | |
72fd4a35 | 853 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 LT |
854 | * buffer overflows. |
855 | */ | |
856 | int sprintf(char * buf, const char *fmt, ...) | |
857 | { | |
858 | va_list args; | |
859 | int i; | |
860 | ||
861 | va_start(args, fmt); | |
862 | i=vsnprintf(buf, INT_MAX, fmt, args); | |
863 | va_end(args); | |
864 | return i; | |
865 | } | |
866 | ||
867 | EXPORT_SYMBOL(sprintf); | |
868 | ||
869 | /** | |
870 | * vsscanf - Unformat a buffer into a list of arguments | |
871 | * @buf: input buffer | |
872 | * @fmt: format of buffer | |
873 | * @args: arguments | |
874 | */ | |
875 | int vsscanf(const char * buf, const char * fmt, va_list args) | |
876 | { | |
877 | const char *str = buf; | |
878 | char *next; | |
879 | char digit; | |
880 | int num = 0; | |
881 | int qualifier; | |
882 | int base; | |
883 | int field_width; | |
884 | int is_sign = 0; | |
885 | ||
886 | while(*fmt && *str) { | |
887 | /* skip any white space in format */ | |
888 | /* white space in format matchs any amount of | |
889 | * white space, including none, in the input. | |
890 | */ | |
891 | if (isspace(*fmt)) { | |
892 | while (isspace(*fmt)) | |
893 | ++fmt; | |
894 | while (isspace(*str)) | |
895 | ++str; | |
896 | } | |
897 | ||
898 | /* anything that is not a conversion must match exactly */ | |
899 | if (*fmt != '%' && *fmt) { | |
900 | if (*fmt++ != *str++) | |
901 | break; | |
902 | continue; | |
903 | } | |
904 | ||
905 | if (!*fmt) | |
906 | break; | |
907 | ++fmt; | |
908 | ||
909 | /* skip this conversion. | |
910 | * advance both strings to next white space | |
911 | */ | |
912 | if (*fmt == '*') { | |
913 | while (!isspace(*fmt) && *fmt) | |
914 | fmt++; | |
915 | while (!isspace(*str) && *str) | |
916 | str++; | |
917 | continue; | |
918 | } | |
919 | ||
920 | /* get field width */ | |
921 | field_width = -1; | |
922 | if (isdigit(*fmt)) | |
923 | field_width = skip_atoi(&fmt); | |
924 | ||
925 | /* get conversion qualifier */ | |
926 | qualifier = -1; | |
927 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
928 | *fmt == 'Z' || *fmt == 'z') { | |
929 | qualifier = *fmt++; | |
930 | if (unlikely(qualifier == *fmt)) { | |
931 | if (qualifier == 'h') { | |
932 | qualifier = 'H'; | |
933 | fmt++; | |
934 | } else if (qualifier == 'l') { | |
935 | qualifier = 'L'; | |
936 | fmt++; | |
937 | } | |
938 | } | |
939 | } | |
940 | base = 10; | |
941 | is_sign = 0; | |
942 | ||
943 | if (!*fmt || !*str) | |
944 | break; | |
945 | ||
946 | switch(*fmt++) { | |
947 | case 'c': | |
948 | { | |
949 | char *s = (char *) va_arg(args,char*); | |
950 | if (field_width == -1) | |
951 | field_width = 1; | |
952 | do { | |
953 | *s++ = *str++; | |
954 | } while (--field_width > 0 && *str); | |
955 | num++; | |
956 | } | |
957 | continue; | |
958 | case 's': | |
959 | { | |
960 | char *s = (char *) va_arg(args, char *); | |
961 | if(field_width == -1) | |
962 | field_width = INT_MAX; | |
963 | /* first, skip leading white space in buffer */ | |
964 | while (isspace(*str)) | |
965 | str++; | |
966 | ||
967 | /* now copy until next white space */ | |
968 | while (*str && !isspace(*str) && field_width--) { | |
969 | *s++ = *str++; | |
970 | } | |
971 | *s = '\0'; | |
972 | num++; | |
973 | } | |
974 | continue; | |
975 | case 'n': | |
976 | /* return number of characters read so far */ | |
977 | { | |
978 | int *i = (int *)va_arg(args,int*); | |
979 | *i = str - buf; | |
980 | } | |
981 | continue; | |
982 | case 'o': | |
983 | base = 8; | |
984 | break; | |
985 | case 'x': | |
986 | case 'X': | |
987 | base = 16; | |
988 | break; | |
989 | case 'i': | |
990 | base = 0; | |
991 | case 'd': | |
992 | is_sign = 1; | |
993 | case 'u': | |
994 | break; | |
995 | case '%': | |
996 | /* looking for '%' in str */ | |
997 | if (*str++ != '%') | |
998 | return num; | |
999 | continue; | |
1000 | default: | |
1001 | /* invalid format; stop here */ | |
1002 | return num; | |
1003 | } | |
1004 | ||
1005 | /* have some sort of integer conversion. | |
1006 | * first, skip white space in buffer. | |
1007 | */ | |
1008 | while (isspace(*str)) | |
1009 | str++; | |
1010 | ||
1011 | digit = *str; | |
1012 | if (is_sign && digit == '-') | |
1013 | digit = *(str + 1); | |
1014 | ||
1015 | if (!digit | |
1016 | || (base == 16 && !isxdigit(digit)) | |
1017 | || (base == 10 && !isdigit(digit)) | |
1018 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1019 | || (base == 0 && !isdigit(digit))) | |
1020 | break; | |
1021 | ||
1022 | switch(qualifier) { | |
1023 | case 'H': /* that's 'hh' in format */ | |
1024 | if (is_sign) { | |
1025 | signed char *s = (signed char *) va_arg(args,signed char *); | |
1026 | *s = (signed char) simple_strtol(str,&next,base); | |
1027 | } else { | |
1028 | unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); | |
1029 | *s = (unsigned char) simple_strtoul(str, &next, base); | |
1030 | } | |
1031 | break; | |
1032 | case 'h': | |
1033 | if (is_sign) { | |
1034 | short *s = (short *) va_arg(args,short *); | |
1035 | *s = (short) simple_strtol(str,&next,base); | |
1036 | } else { | |
1037 | unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); | |
1038 | *s = (unsigned short) simple_strtoul(str, &next, base); | |
1039 | } | |
1040 | break; | |
1041 | case 'l': | |
1042 | if (is_sign) { | |
1043 | long *l = (long *) va_arg(args,long *); | |
1044 | *l = simple_strtol(str,&next,base); | |
1045 | } else { | |
1046 | unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); | |
1047 | *l = simple_strtoul(str,&next,base); | |
1048 | } | |
1049 | break; | |
1050 | case 'L': | |
1051 | if (is_sign) { | |
1052 | long long *l = (long long*) va_arg(args,long long *); | |
1053 | *l = simple_strtoll(str,&next,base); | |
1054 | } else { | |
1055 | unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); | |
1056 | *l = simple_strtoull(str,&next,base); | |
1057 | } | |
1058 | break; | |
1059 | case 'Z': | |
1060 | case 'z': | |
1061 | { | |
1062 | size_t *s = (size_t*) va_arg(args,size_t*); | |
1063 | *s = (size_t) simple_strtoul(str,&next,base); | |
1064 | } | |
1065 | break; | |
1066 | default: | |
1067 | if (is_sign) { | |
1068 | int *i = (int *) va_arg(args, int*); | |
1069 | *i = (int) simple_strtol(str,&next,base); | |
1070 | } else { | |
1071 | unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); | |
1072 | *i = (unsigned int) simple_strtoul(str,&next,base); | |
1073 | } | |
1074 | break; | |
1075 | } | |
1076 | num++; | |
1077 | ||
1078 | if (!next) | |
1079 | break; | |
1080 | str = next; | |
1081 | } | |
c6b40d16 JB |
1082 | |
1083 | /* | |
1084 | * Now we've come all the way through so either the input string or the | |
1085 | * format ended. In the former case, there can be a %n at the current | |
1086 | * position in the format that needs to be filled. | |
1087 | */ | |
1088 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
1089 | int *p = (int *)va_arg(args, int *); | |
1090 | *p = str - buf; | |
1091 | } | |
1092 | ||
1da177e4 LT |
1093 | return num; |
1094 | } | |
1095 | ||
1096 | EXPORT_SYMBOL(vsscanf); | |
1097 | ||
1098 | /** | |
1099 | * sscanf - Unformat a buffer into a list of arguments | |
1100 | * @buf: input buffer | |
1101 | * @fmt: formatting of buffer | |
1102 | * @...: resulting arguments | |
1103 | */ | |
1104 | int sscanf(const char * buf, const char * fmt, ...) | |
1105 | { | |
1106 | va_list args; | |
1107 | int i; | |
1108 | ||
1109 | va_start(args,fmt); | |
1110 | i = vsscanf(buf,fmt,args); | |
1111 | va_end(args); | |
1112 | return i; | |
1113 | } | |
1114 | ||
1115 | EXPORT_SYMBOL(sscanf); |