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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 | ||
29 | /** | |
30 | * simple_strtoul - convert a string to an unsigned long | |
31 | * @cp: The start of the string | |
32 | * @endp: A pointer to the end of the parsed string will be placed here | |
33 | * @base: The number base to use | |
34 | */ | |
35 | unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base) | |
36 | { | |
37 | unsigned long result = 0,value; | |
38 | ||
39 | if (!base) { | |
40 | base = 10; | |
41 | if (*cp == '0') { | |
42 | base = 8; | |
43 | cp++; | |
44 | if ((toupper(*cp) == 'X') && isxdigit(cp[1])) { | |
45 | cp++; | |
46 | base = 16; | |
47 | } | |
48 | } | |
49 | } else if (base == 16) { | |
50 | if (cp[0] == '0' && toupper(cp[1]) == 'X') | |
51 | cp += 2; | |
52 | } | |
53 | while (isxdigit(*cp) && | |
54 | (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) { | |
55 | result = result*base + value; | |
56 | cp++; | |
57 | } | |
58 | if (endp) | |
59 | *endp = (char *)cp; | |
60 | return result; | |
61 | } | |
62 | ||
63 | EXPORT_SYMBOL(simple_strtoul); | |
64 | ||
65 | /** | |
66 | * simple_strtol - convert a string to a signed long | |
67 | * @cp: The start of the string | |
68 | * @endp: A pointer to the end of the parsed string will be placed here | |
69 | * @base: The number base to use | |
70 | */ | |
71 | long simple_strtol(const char *cp,char **endp,unsigned int base) | |
72 | { | |
73 | if(*cp=='-') | |
74 | return -simple_strtoul(cp+1,endp,base); | |
75 | return simple_strtoul(cp,endp,base); | |
76 | } | |
77 | ||
78 | EXPORT_SYMBOL(simple_strtol); | |
79 | ||
80 | /** | |
81 | * simple_strtoull - convert a string to an unsigned long long | |
82 | * @cp: The start of the string | |
83 | * @endp: A pointer to the end of the parsed string will be placed here | |
84 | * @base: The number base to use | |
85 | */ | |
86 | unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base) | |
87 | { | |
88 | unsigned long long result = 0,value; | |
89 | ||
90 | if (!base) { | |
91 | base = 10; | |
92 | if (*cp == '0') { | |
93 | base = 8; | |
94 | cp++; | |
95 | if ((toupper(*cp) == 'X') && isxdigit(cp[1])) { | |
96 | cp++; | |
97 | base = 16; | |
98 | } | |
99 | } | |
100 | } else if (base == 16) { | |
101 | if (cp[0] == '0' && toupper(cp[1]) == 'X') | |
102 | cp += 2; | |
103 | } | |
104 | while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp) | |
105 | ? toupper(*cp) : *cp)-'A'+10) < base) { | |
106 | result = result*base + value; | |
107 | cp++; | |
108 | } | |
109 | if (endp) | |
110 | *endp = (char *)cp; | |
111 | return result; | |
112 | } | |
113 | ||
114 | EXPORT_SYMBOL(simple_strtoull); | |
115 | ||
116 | /** | |
117 | * simple_strtoll - convert a string to a signed long long | |
118 | * @cp: The start of the string | |
119 | * @endp: A pointer to the end of the parsed string will be placed here | |
120 | * @base: The number base to use | |
121 | */ | |
122 | long long simple_strtoll(const char *cp,char **endp,unsigned int base) | |
123 | { | |
124 | if(*cp=='-') | |
125 | return -simple_strtoull(cp+1,endp,base); | |
126 | return simple_strtoull(cp,endp,base); | |
127 | } | |
128 | ||
129 | static int skip_atoi(const char **s) | |
130 | { | |
131 | int i=0; | |
132 | ||
133 | while (isdigit(**s)) | |
134 | i = i*10 + *((*s)++) - '0'; | |
135 | return i; | |
136 | } | |
137 | ||
138 | #define ZEROPAD 1 /* pad with zero */ | |
139 | #define SIGN 2 /* unsigned/signed long */ | |
140 | #define PLUS 4 /* show plus */ | |
141 | #define SPACE 8 /* space if plus */ | |
142 | #define LEFT 16 /* left justified */ | |
143 | #define SPECIAL 32 /* 0x */ | |
144 | #define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */ | |
145 | ||
b39a7340 | 146 | static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type) |
1da177e4 | 147 | { |
b39a7340 | 148 | char sign,tmp[66]; |
1da177e4 | 149 | const char *digits; |
b39a7340 DV |
150 | /* we are called with base 8, 10 or 16, only, thus don't need "g..." */ |
151 | static const char small_digits[] = "0123456789abcdefx"; /* "ghijklmnopqrstuvwxyz"; */ | |
152 | static const char large_digits[] = "0123456789ABCDEFX"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
153 | int need_pfx = ((type & SPECIAL) && base != 10); | |
1da177e4 LT |
154 | int i; |
155 | ||
156 | digits = (type & LARGE) ? large_digits : small_digits; | |
157 | if (type & LEFT) | |
158 | type &= ~ZEROPAD; | |
159 | if (base < 2 || base > 36) | |
160 | return NULL; | |
1da177e4 LT |
161 | sign = 0; |
162 | if (type & SIGN) { | |
163 | if ((signed long long) num < 0) { | |
164 | sign = '-'; | |
165 | num = - (signed long long) num; | |
166 | size--; | |
167 | } else if (type & PLUS) { | |
168 | sign = '+'; | |
169 | size--; | |
170 | } else if (type & SPACE) { | |
171 | sign = ' '; | |
172 | size--; | |
173 | } | |
174 | } | |
b39a7340 DV |
175 | if (need_pfx) { |
176 | size--; | |
1da177e4 | 177 | if (base == 16) |
1da177e4 LT |
178 | size--; |
179 | } | |
b39a7340 DV |
180 | |
181 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
182 | i = 0; |
183 | if (num == 0) | |
b39a7340 DV |
184 | tmp[i++] = '0'; |
185 | else if (base != 10) { /* 8 or 16 */ | |
186 | int mask = base - 1; | |
187 | int shift = 3; | |
188 | if (base == 16) shift = 4; | |
189 | do { | |
190 | tmp[i++] = digits[((unsigned char)num) & mask]; | |
191 | num >>= shift; | |
192 | } while (num); | |
193 | } else do { /* generic code, works for any base */ | |
194 | tmp[i++] = digits[do_div(num,10 /*base*/)]; | |
195 | } while (num); | |
196 | ||
197 | /* printing 100 using %2d gives "100", not "00" */ | |
1da177e4 LT |
198 | if (i > precision) |
199 | precision = i; | |
b39a7340 | 200 | /* leading space padding */ |
1da177e4 | 201 | size -= precision; |
b39a7340 DV |
202 | if (!(type & (ZEROPAD+LEFT))) { |
203 | while(--size >= 0) { | |
f796937a | 204 | if (buf < end) |
1da177e4 LT |
205 | *buf = ' '; |
206 | ++buf; | |
207 | } | |
208 | } | |
b39a7340 | 209 | /* sign */ |
1da177e4 | 210 | if (sign) { |
f796937a | 211 | if (buf < end) |
1da177e4 LT |
212 | *buf = sign; |
213 | ++buf; | |
214 | } | |
b39a7340 DV |
215 | /* "0x" / "0" prefix */ |
216 | if (need_pfx) { | |
217 | if (buf < end) | |
218 | *buf = '0'; | |
219 | ++buf; | |
220 | if (base == 16) { | |
f796937a | 221 | if (buf < end) |
b39a7340 | 222 | *buf = digits[16]; /* for arbitrary base: digits[33]; */ |
1da177e4 LT |
223 | ++buf; |
224 | } | |
225 | } | |
b39a7340 | 226 | /* zero or space padding */ |
1da177e4 | 227 | if (!(type & LEFT)) { |
b39a7340 DV |
228 | char c = (type & ZEROPAD) ? '0' : ' '; |
229 | while (--size >= 0) { | |
f796937a | 230 | if (buf < end) |
1da177e4 LT |
231 | *buf = c; |
232 | ++buf; | |
233 | } | |
234 | } | |
b39a7340 DV |
235 | /* hmm even more zero padding? */ |
236 | while (i <= --precision) { | |
f796937a | 237 | if (buf < end) |
1da177e4 LT |
238 | *buf = '0'; |
239 | ++buf; | |
240 | } | |
b39a7340 DV |
241 | /* actual digits of result */ |
242 | while (--i >= 0) { | |
f796937a | 243 | if (buf < end) |
1da177e4 LT |
244 | *buf = tmp[i]; |
245 | ++buf; | |
246 | } | |
b39a7340 DV |
247 | /* trailing space padding */ |
248 | while (--size >= 0) { | |
f796937a | 249 | if (buf < end) |
1da177e4 LT |
250 | *buf = ' '; |
251 | ++buf; | |
252 | } | |
253 | return buf; | |
254 | } | |
255 | ||
256 | /** | |
257 | * vsnprintf - Format a string and place it in a buffer | |
258 | * @buf: The buffer to place the result into | |
259 | * @size: The size of the buffer, including the trailing null space | |
260 | * @fmt: The format string to use | |
261 | * @args: Arguments for the format string | |
262 | * | |
263 | * The return value is the number of characters which would | |
264 | * be generated for the given input, excluding the trailing | |
265 | * '\0', as per ISO C99. If you want to have the exact | |
266 | * number of characters written into @buf as return value | |
72fd4a35 | 267 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
268 | * return is greater than or equal to @size, the resulting |
269 | * string is truncated. | |
270 | * | |
271 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 272 | * You probably want snprintf() instead. |
1da177e4 LT |
273 | */ |
274 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
275 | { | |
276 | int len; | |
277 | unsigned long long num; | |
278 | int i, base; | |
279 | char *str, *end, c; | |
280 | const char *s; | |
281 | ||
282 | int flags; /* flags to number() */ | |
283 | ||
284 | int field_width; /* width of output field */ | |
285 | int precision; /* min. # of digits for integers; max | |
286 | number of chars for from string */ | |
287 | int qualifier; /* 'h', 'l', or 'L' for integer fields */ | |
288 | /* 'z' support added 23/7/1999 S.H. */ | |
289 | /* 'z' changed to 'Z' --davidm 1/25/99 */ | |
80322306 | 290 | /* 't' added for ptrdiff_t */ |
1da177e4 | 291 | |
f796937a JF |
292 | /* Reject out-of-range values early. Large positive sizes are |
293 | used for unknown buffer sizes. */ | |
1da177e4 LT |
294 | if (unlikely((int) size < 0)) { |
295 | /* There can be only one.. */ | |
b39a7340 | 296 | static char warn = 1; |
1da177e4 LT |
297 | WARN_ON(warn); |
298 | warn = 0; | |
299 | return 0; | |
300 | } | |
301 | ||
302 | str = buf; | |
f796937a | 303 | end = buf + size; |
1da177e4 | 304 | |
f796937a JF |
305 | /* Make sure end is always >= buf */ |
306 | if (end < buf) { | |
307 | end = ((void *)-1); | |
308 | size = end - buf; | |
1da177e4 LT |
309 | } |
310 | ||
311 | for (; *fmt ; ++fmt) { | |
312 | if (*fmt != '%') { | |
f796937a | 313 | if (str < end) |
1da177e4 LT |
314 | *str = *fmt; |
315 | ++str; | |
316 | continue; | |
317 | } | |
318 | ||
319 | /* process flags */ | |
320 | flags = 0; | |
321 | repeat: | |
322 | ++fmt; /* this also skips first '%' */ | |
323 | switch (*fmt) { | |
324 | case '-': flags |= LEFT; goto repeat; | |
325 | case '+': flags |= PLUS; goto repeat; | |
326 | case ' ': flags |= SPACE; goto repeat; | |
327 | case '#': flags |= SPECIAL; goto repeat; | |
328 | case '0': flags |= ZEROPAD; goto repeat; | |
329 | } | |
330 | ||
331 | /* get field width */ | |
332 | field_width = -1; | |
333 | if (isdigit(*fmt)) | |
334 | field_width = skip_atoi(&fmt); | |
335 | else if (*fmt == '*') { | |
336 | ++fmt; | |
337 | /* it's the next argument */ | |
338 | field_width = va_arg(args, int); | |
339 | if (field_width < 0) { | |
340 | field_width = -field_width; | |
341 | flags |= LEFT; | |
342 | } | |
343 | } | |
344 | ||
345 | /* get the precision */ | |
346 | precision = -1; | |
347 | if (*fmt == '.') { | |
348 | ++fmt; | |
349 | if (isdigit(*fmt)) | |
350 | precision = skip_atoi(&fmt); | |
351 | else if (*fmt == '*') { | |
352 | ++fmt; | |
353 | /* it's the next argument */ | |
354 | precision = va_arg(args, int); | |
355 | } | |
356 | if (precision < 0) | |
357 | precision = 0; | |
358 | } | |
359 | ||
360 | /* get the conversion qualifier */ | |
361 | qualifier = -1; | |
362 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
80322306 | 363 | *fmt =='Z' || *fmt == 'z' || *fmt == 't') { |
1da177e4 LT |
364 | qualifier = *fmt; |
365 | ++fmt; | |
366 | if (qualifier == 'l' && *fmt == 'l') { | |
367 | qualifier = 'L'; | |
368 | ++fmt; | |
369 | } | |
370 | } | |
371 | ||
372 | /* default base */ | |
373 | base = 10; | |
374 | ||
375 | switch (*fmt) { | |
376 | case 'c': | |
377 | if (!(flags & LEFT)) { | |
378 | while (--field_width > 0) { | |
f796937a | 379 | if (str < end) |
1da177e4 LT |
380 | *str = ' '; |
381 | ++str; | |
382 | } | |
383 | } | |
384 | c = (unsigned char) va_arg(args, int); | |
f796937a | 385 | if (str < end) |
1da177e4 LT |
386 | *str = c; |
387 | ++str; | |
388 | while (--field_width > 0) { | |
f796937a | 389 | if (str < end) |
1da177e4 LT |
390 | *str = ' '; |
391 | ++str; | |
392 | } | |
393 | continue; | |
394 | ||
395 | case 's': | |
396 | s = va_arg(args, char *); | |
397 | if ((unsigned long)s < PAGE_SIZE) | |
398 | s = "<NULL>"; | |
399 | ||
400 | len = strnlen(s, precision); | |
401 | ||
402 | if (!(flags & LEFT)) { | |
403 | while (len < field_width--) { | |
f796937a | 404 | if (str < end) |
1da177e4 LT |
405 | *str = ' '; |
406 | ++str; | |
407 | } | |
408 | } | |
409 | for (i = 0; i < len; ++i) { | |
f796937a | 410 | if (str < end) |
1da177e4 LT |
411 | *str = *s; |
412 | ++str; ++s; | |
413 | } | |
414 | while (len < field_width--) { | |
f796937a | 415 | if (str < end) |
1da177e4 LT |
416 | *str = ' '; |
417 | ++str; | |
418 | } | |
419 | continue; | |
420 | ||
421 | case 'p': | |
422 | if (field_width == -1) { | |
423 | field_width = 2*sizeof(void *); | |
424 | flags |= ZEROPAD; | |
425 | } | |
426 | str = number(str, end, | |
427 | (unsigned long) va_arg(args, void *), | |
428 | 16, field_width, precision, flags); | |
429 | continue; | |
430 | ||
431 | ||
432 | case 'n': | |
433 | /* FIXME: | |
434 | * What does C99 say about the overflow case here? */ | |
435 | if (qualifier == 'l') { | |
436 | long * ip = va_arg(args, long *); | |
437 | *ip = (str - buf); | |
438 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
439 | size_t * ip = va_arg(args, size_t *); | |
440 | *ip = (str - buf); | |
441 | } else { | |
442 | int * ip = va_arg(args, int *); | |
443 | *ip = (str - buf); | |
444 | } | |
445 | continue; | |
446 | ||
447 | case '%': | |
f796937a | 448 | if (str < end) |
1da177e4 LT |
449 | *str = '%'; |
450 | ++str; | |
451 | continue; | |
452 | ||
453 | /* integer number formats - set up the flags and "break" */ | |
454 | case 'o': | |
455 | base = 8; | |
456 | break; | |
457 | ||
458 | case 'X': | |
459 | flags |= LARGE; | |
460 | case 'x': | |
461 | base = 16; | |
462 | break; | |
463 | ||
464 | case 'd': | |
465 | case 'i': | |
466 | flags |= SIGN; | |
467 | case 'u': | |
468 | break; | |
469 | ||
470 | default: | |
f796937a | 471 | if (str < end) |
1da177e4 LT |
472 | *str = '%'; |
473 | ++str; | |
474 | if (*fmt) { | |
f796937a | 475 | if (str < end) |
1da177e4 LT |
476 | *str = *fmt; |
477 | ++str; | |
478 | } else { | |
479 | --fmt; | |
480 | } | |
481 | continue; | |
482 | } | |
483 | if (qualifier == 'L') | |
484 | num = va_arg(args, long long); | |
485 | else if (qualifier == 'l') { | |
486 | num = va_arg(args, unsigned long); | |
487 | if (flags & SIGN) | |
488 | num = (signed long) num; | |
489 | } else if (qualifier == 'Z' || qualifier == 'z') { | |
490 | num = va_arg(args, size_t); | |
80322306 AV |
491 | } else if (qualifier == 't') { |
492 | num = va_arg(args, ptrdiff_t); | |
1da177e4 LT |
493 | } else if (qualifier == 'h') { |
494 | num = (unsigned short) va_arg(args, int); | |
495 | if (flags & SIGN) | |
496 | num = (signed short) num; | |
497 | } else { | |
498 | num = va_arg(args, unsigned int); | |
499 | if (flags & SIGN) | |
500 | num = (signed int) num; | |
501 | } | |
502 | str = number(str, end, num, base, | |
503 | field_width, precision, flags); | |
504 | } | |
f796937a JF |
505 | if (size > 0) { |
506 | if (str < end) | |
507 | *str = '\0'; | |
508 | else | |
0a6047ee | 509 | end[-1] = '\0'; |
f796937a JF |
510 | } |
511 | /* the trailing null byte doesn't count towards the total */ | |
1da177e4 LT |
512 | return str-buf; |
513 | } | |
514 | ||
515 | EXPORT_SYMBOL(vsnprintf); | |
516 | ||
517 | /** | |
518 | * vscnprintf - Format a string and place it in a buffer | |
519 | * @buf: The buffer to place the result into | |
520 | * @size: The size of the buffer, including the trailing null space | |
521 | * @fmt: The format string to use | |
522 | * @args: Arguments for the format string | |
523 | * | |
524 | * The return value is the number of characters which have been written into | |
525 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
526 | * returns 0. | |
527 | * | |
528 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 529 | * You probably want scnprintf() instead. |
1da177e4 LT |
530 | */ |
531 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
532 | { | |
533 | int i; | |
534 | ||
535 | i=vsnprintf(buf,size,fmt,args); | |
536 | return (i >= size) ? (size - 1) : i; | |
537 | } | |
538 | ||
539 | EXPORT_SYMBOL(vscnprintf); | |
540 | ||
541 | /** | |
542 | * snprintf - Format a string and place it in a buffer | |
543 | * @buf: The buffer to place the result into | |
544 | * @size: The size of the buffer, including the trailing null space | |
545 | * @fmt: The format string to use | |
546 | * @...: Arguments for the format string | |
547 | * | |
548 | * The return value is the number of characters which would be | |
549 | * generated for the given input, excluding the trailing null, | |
550 | * as per ISO C99. If the return is greater than or equal to | |
551 | * @size, the resulting string is truncated. | |
552 | */ | |
553 | int snprintf(char * buf, size_t size, const char *fmt, ...) | |
554 | { | |
555 | va_list args; | |
556 | int i; | |
557 | ||
558 | va_start(args, fmt); | |
559 | i=vsnprintf(buf,size,fmt,args); | |
560 | va_end(args); | |
561 | return i; | |
562 | } | |
563 | ||
564 | EXPORT_SYMBOL(snprintf); | |
565 | ||
566 | /** | |
567 | * scnprintf - Format a string and place it in a buffer | |
568 | * @buf: The buffer to place the result into | |
569 | * @size: The size of the buffer, including the trailing null space | |
570 | * @fmt: The format string to use | |
571 | * @...: Arguments for the format string | |
572 | * | |
573 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 574 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
575 | */ |
576 | ||
577 | int scnprintf(char * buf, size_t size, const char *fmt, ...) | |
578 | { | |
579 | va_list args; | |
580 | int i; | |
581 | ||
582 | va_start(args, fmt); | |
583 | i = vsnprintf(buf, size, fmt, args); | |
584 | va_end(args); | |
585 | return (i >= size) ? (size - 1) : i; | |
586 | } | |
587 | EXPORT_SYMBOL(scnprintf); | |
588 | ||
589 | /** | |
590 | * vsprintf - Format a string and place it in a buffer | |
591 | * @buf: The buffer to place the result into | |
592 | * @fmt: The format string to use | |
593 | * @args: Arguments for the format string | |
594 | * | |
595 | * The function returns the number of characters written | |
72fd4a35 | 596 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
597 | * buffer overflows. |
598 | * | |
599 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 600 | * You probably want sprintf() instead. |
1da177e4 LT |
601 | */ |
602 | int vsprintf(char *buf, const char *fmt, va_list args) | |
603 | { | |
604 | return vsnprintf(buf, INT_MAX, fmt, args); | |
605 | } | |
606 | ||
607 | EXPORT_SYMBOL(vsprintf); | |
608 | ||
609 | /** | |
610 | * sprintf - Format a string and place it in a buffer | |
611 | * @buf: The buffer to place the result into | |
612 | * @fmt: The format string to use | |
613 | * @...: Arguments for the format string | |
614 | * | |
615 | * The function returns the number of characters written | |
72fd4a35 | 616 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 LT |
617 | * buffer overflows. |
618 | */ | |
619 | int sprintf(char * buf, const char *fmt, ...) | |
620 | { | |
621 | va_list args; | |
622 | int i; | |
623 | ||
624 | va_start(args, fmt); | |
625 | i=vsnprintf(buf, INT_MAX, fmt, args); | |
626 | va_end(args); | |
627 | return i; | |
628 | } | |
629 | ||
630 | EXPORT_SYMBOL(sprintf); | |
631 | ||
632 | /** | |
633 | * vsscanf - Unformat a buffer into a list of arguments | |
634 | * @buf: input buffer | |
635 | * @fmt: format of buffer | |
636 | * @args: arguments | |
637 | */ | |
638 | int vsscanf(const char * buf, const char * fmt, va_list args) | |
639 | { | |
640 | const char *str = buf; | |
641 | char *next; | |
642 | char digit; | |
643 | int num = 0; | |
644 | int qualifier; | |
645 | int base; | |
646 | int field_width; | |
647 | int is_sign = 0; | |
648 | ||
649 | while(*fmt && *str) { | |
650 | /* skip any white space in format */ | |
651 | /* white space in format matchs any amount of | |
652 | * white space, including none, in the input. | |
653 | */ | |
654 | if (isspace(*fmt)) { | |
655 | while (isspace(*fmt)) | |
656 | ++fmt; | |
657 | while (isspace(*str)) | |
658 | ++str; | |
659 | } | |
660 | ||
661 | /* anything that is not a conversion must match exactly */ | |
662 | if (*fmt != '%' && *fmt) { | |
663 | if (*fmt++ != *str++) | |
664 | break; | |
665 | continue; | |
666 | } | |
667 | ||
668 | if (!*fmt) | |
669 | break; | |
670 | ++fmt; | |
671 | ||
672 | /* skip this conversion. | |
673 | * advance both strings to next white space | |
674 | */ | |
675 | if (*fmt == '*') { | |
676 | while (!isspace(*fmt) && *fmt) | |
677 | fmt++; | |
678 | while (!isspace(*str) && *str) | |
679 | str++; | |
680 | continue; | |
681 | } | |
682 | ||
683 | /* get field width */ | |
684 | field_width = -1; | |
685 | if (isdigit(*fmt)) | |
686 | field_width = skip_atoi(&fmt); | |
687 | ||
688 | /* get conversion qualifier */ | |
689 | qualifier = -1; | |
690 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
691 | *fmt == 'Z' || *fmt == 'z') { | |
692 | qualifier = *fmt++; | |
693 | if (unlikely(qualifier == *fmt)) { | |
694 | if (qualifier == 'h') { | |
695 | qualifier = 'H'; | |
696 | fmt++; | |
697 | } else if (qualifier == 'l') { | |
698 | qualifier = 'L'; | |
699 | fmt++; | |
700 | } | |
701 | } | |
702 | } | |
703 | base = 10; | |
704 | is_sign = 0; | |
705 | ||
706 | if (!*fmt || !*str) | |
707 | break; | |
708 | ||
709 | switch(*fmt++) { | |
710 | case 'c': | |
711 | { | |
712 | char *s = (char *) va_arg(args,char*); | |
713 | if (field_width == -1) | |
714 | field_width = 1; | |
715 | do { | |
716 | *s++ = *str++; | |
717 | } while (--field_width > 0 && *str); | |
718 | num++; | |
719 | } | |
720 | continue; | |
721 | case 's': | |
722 | { | |
723 | char *s = (char *) va_arg(args, char *); | |
724 | if(field_width == -1) | |
725 | field_width = INT_MAX; | |
726 | /* first, skip leading white space in buffer */ | |
727 | while (isspace(*str)) | |
728 | str++; | |
729 | ||
730 | /* now copy until next white space */ | |
731 | while (*str && !isspace(*str) && field_width--) { | |
732 | *s++ = *str++; | |
733 | } | |
734 | *s = '\0'; | |
735 | num++; | |
736 | } | |
737 | continue; | |
738 | case 'n': | |
739 | /* return number of characters read so far */ | |
740 | { | |
741 | int *i = (int *)va_arg(args,int*); | |
742 | *i = str - buf; | |
743 | } | |
744 | continue; | |
745 | case 'o': | |
746 | base = 8; | |
747 | break; | |
748 | case 'x': | |
749 | case 'X': | |
750 | base = 16; | |
751 | break; | |
752 | case 'i': | |
753 | base = 0; | |
754 | case 'd': | |
755 | is_sign = 1; | |
756 | case 'u': | |
757 | break; | |
758 | case '%': | |
759 | /* looking for '%' in str */ | |
760 | if (*str++ != '%') | |
761 | return num; | |
762 | continue; | |
763 | default: | |
764 | /* invalid format; stop here */ | |
765 | return num; | |
766 | } | |
767 | ||
768 | /* have some sort of integer conversion. | |
769 | * first, skip white space in buffer. | |
770 | */ | |
771 | while (isspace(*str)) | |
772 | str++; | |
773 | ||
774 | digit = *str; | |
775 | if (is_sign && digit == '-') | |
776 | digit = *(str + 1); | |
777 | ||
778 | if (!digit | |
779 | || (base == 16 && !isxdigit(digit)) | |
780 | || (base == 10 && !isdigit(digit)) | |
781 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
782 | || (base == 0 && !isdigit(digit))) | |
783 | break; | |
784 | ||
785 | switch(qualifier) { | |
786 | case 'H': /* that's 'hh' in format */ | |
787 | if (is_sign) { | |
788 | signed char *s = (signed char *) va_arg(args,signed char *); | |
789 | *s = (signed char) simple_strtol(str,&next,base); | |
790 | } else { | |
791 | unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); | |
792 | *s = (unsigned char) simple_strtoul(str, &next, base); | |
793 | } | |
794 | break; | |
795 | case 'h': | |
796 | if (is_sign) { | |
797 | short *s = (short *) va_arg(args,short *); | |
798 | *s = (short) simple_strtol(str,&next,base); | |
799 | } else { | |
800 | unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); | |
801 | *s = (unsigned short) simple_strtoul(str, &next, base); | |
802 | } | |
803 | break; | |
804 | case 'l': | |
805 | if (is_sign) { | |
806 | long *l = (long *) va_arg(args,long *); | |
807 | *l = simple_strtol(str,&next,base); | |
808 | } else { | |
809 | unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); | |
810 | *l = simple_strtoul(str,&next,base); | |
811 | } | |
812 | break; | |
813 | case 'L': | |
814 | if (is_sign) { | |
815 | long long *l = (long long*) va_arg(args,long long *); | |
816 | *l = simple_strtoll(str,&next,base); | |
817 | } else { | |
818 | unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); | |
819 | *l = simple_strtoull(str,&next,base); | |
820 | } | |
821 | break; | |
822 | case 'Z': | |
823 | case 'z': | |
824 | { | |
825 | size_t *s = (size_t*) va_arg(args,size_t*); | |
826 | *s = (size_t) simple_strtoul(str,&next,base); | |
827 | } | |
828 | break; | |
829 | default: | |
830 | if (is_sign) { | |
831 | int *i = (int *) va_arg(args, int*); | |
832 | *i = (int) simple_strtol(str,&next,base); | |
833 | } else { | |
834 | unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); | |
835 | *i = (unsigned int) simple_strtoul(str,&next,base); | |
836 | } | |
837 | break; | |
838 | } | |
839 | num++; | |
840 | ||
841 | if (!next) | |
842 | break; | |
843 | str = next; | |
844 | } | |
c6b40d16 JB |
845 | |
846 | /* | |
847 | * Now we've come all the way through so either the input string or the | |
848 | * format ended. In the former case, there can be a %n at the current | |
849 | * position in the format that needs to be filled. | |
850 | */ | |
851 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
852 | int *p = (int *)va_arg(args, int *); | |
853 | *p = str - buf; | |
854 | } | |
855 | ||
1da177e4 LT |
856 | return num; |
857 | } | |
858 | ||
859 | EXPORT_SYMBOL(vsscanf); | |
860 | ||
861 | /** | |
862 | * sscanf - Unformat a buffer into a list of arguments | |
863 | * @buf: input buffer | |
864 | * @fmt: formatting of buffer | |
865 | * @...: resulting arguments | |
866 | */ | |
867 | int sscanf(const char * buf, const char * fmt, ...) | |
868 | { | |
869 | va_list args; | |
870 | int i; | |
871 | ||
872 | va_start(args,fmt); | |
873 | i = vsscanf(buf,fmt,args); | |
874 | va_end(args); | |
875 | return i; | |
876 | } | |
877 | ||
878 | EXPORT_SYMBOL(sscanf); | |
e905914f JF |
879 | |
880 | ||
881 | /* Simplified asprintf. */ | |
11443ec7 | 882 | char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap) |
e905914f | 883 | { |
e905914f JF |
884 | unsigned int len; |
885 | char *p; | |
11443ec7 | 886 | va_list aq; |
e905914f | 887 | |
11443ec7 JF |
888 | va_copy(aq, ap); |
889 | len = vsnprintf(NULL, 0, fmt, aq); | |
890 | va_end(aq); | |
e905914f JF |
891 | |
892 | p = kmalloc(len+1, gfp); | |
893 | if (!p) | |
894 | return NULL; | |
11443ec7 | 895 | |
e905914f | 896 | vsnprintf(p, len+1, fmt, ap); |
11443ec7 | 897 | |
e905914f JF |
898 | return p; |
899 | } | |
11443ec7 JF |
900 | EXPORT_SYMBOL(kvasprintf); |
901 | ||
902 | char *kasprintf(gfp_t gfp, const char *fmt, ...) | |
903 | { | |
904 | va_list ap; | |
905 | char *p; | |
e905914f | 906 | |
11443ec7 JF |
907 | va_start(ap, fmt); |
908 | p = kvasprintf(gfp, fmt, ap); | |
909 | va_end(ap); | |
910 | ||
911 | return p; | |
912 | } | |
e905914f | 913 | EXPORT_SYMBOL(kasprintf); |