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