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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> | |
0fe1ef24 LT |
25 | #include <linux/kallsyms.h> |
26 | #include <linux/uaccess.h> | |
332d2e78 | 27 | #include <linux/ioport.h> |
8a27f7c9 | 28 | #include <net/addrconf.h> |
1da177e4 | 29 | |
4e57b681 | 30 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 | 31 | #include <asm/div64.h> |
deac93df | 32 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 33 | |
9b706aee DV |
34 | /* Works only for digits and letters, but small and fast */ |
35 | #define TOLOWER(x) ((x) | 0x20) | |
36 | ||
aa46a63e HH |
37 | static unsigned int simple_guess_base(const char *cp) |
38 | { | |
39 | if (cp[0] == '0') { | |
40 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) | |
41 | return 16; | |
42 | else | |
43 | return 8; | |
44 | } else { | |
45 | return 10; | |
46 | } | |
47 | } | |
48 | ||
1da177e4 LT |
49 | /** |
50 | * simple_strtoul - convert a string to an unsigned long | |
51 | * @cp: The start of the string | |
52 | * @endp: A pointer to the end of the parsed string will be placed here | |
53 | * @base: The number base to use | |
54 | */ | |
22d27051 | 55 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 56 | { |
aa46a63e HH |
57 | unsigned long result = 0; |
58 | ||
59 | if (!base) | |
60 | base = simple_guess_base(cp); | |
61 | ||
62 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
63 | cp += 2; | |
64 | ||
65 | while (isxdigit(*cp)) { | |
66 | unsigned int value; | |
67 | ||
68 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
69 | if (value >= base) | |
70 | break; | |
71 | result = result * base + value; | |
1da177e4 LT |
72 | cp++; |
73 | } | |
aa46a63e | 74 | |
1da177e4 LT |
75 | if (endp) |
76 | *endp = (char *)cp; | |
77 | return result; | |
78 | } | |
1da177e4 LT |
79 | EXPORT_SYMBOL(simple_strtoul); |
80 | ||
81 | /** | |
82 | * simple_strtol - convert a string to a signed long | |
83 | * @cp: The start of the string | |
84 | * @endp: A pointer to the end of the parsed string will be placed here | |
85 | * @base: The number base to use | |
86 | */ | |
22d27051 | 87 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 88 | { |
22d27051 HH |
89 | if(*cp == '-') |
90 | return -simple_strtoul(cp + 1, endp, base); | |
91 | return simple_strtoul(cp, endp, base); | |
1da177e4 | 92 | } |
1da177e4 LT |
93 | EXPORT_SYMBOL(simple_strtol); |
94 | ||
95 | /** | |
96 | * simple_strtoull - convert a string to an unsigned long long | |
97 | * @cp: The start of the string | |
98 | * @endp: A pointer to the end of the parsed string will be placed here | |
99 | * @base: The number base to use | |
100 | */ | |
22d27051 | 101 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 102 | { |
aa46a63e HH |
103 | unsigned long long result = 0; |
104 | ||
105 | if (!base) | |
106 | base = simple_guess_base(cp); | |
107 | ||
108 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
109 | cp += 2; | |
110 | ||
111 | while (isxdigit(*cp)) { | |
112 | unsigned int value; | |
113 | ||
114 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
115 | if (value >= base) | |
116 | break; | |
117 | result = result * base + value; | |
1da177e4 LT |
118 | cp++; |
119 | } | |
aa46a63e | 120 | |
1da177e4 LT |
121 | if (endp) |
122 | *endp = (char *)cp; | |
123 | return result; | |
124 | } | |
1da177e4 LT |
125 | EXPORT_SYMBOL(simple_strtoull); |
126 | ||
127 | /** | |
128 | * simple_strtoll - convert a string to a signed long long | |
129 | * @cp: The start of the string | |
130 | * @endp: A pointer to the end of the parsed string will be placed here | |
131 | * @base: The number base to use | |
132 | */ | |
22d27051 | 133 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 LT |
134 | { |
135 | if(*cp=='-') | |
22d27051 HH |
136 | return -simple_strtoull(cp + 1, endp, base); |
137 | return simple_strtoull(cp, endp, base); | |
1da177e4 LT |
138 | } |
139 | ||
06b2a76d YY |
140 | /** |
141 | * strict_strtoul - convert a string to an unsigned long strictly | |
142 | * @cp: The string to be converted | |
143 | * @base: The number base to use | |
144 | * @res: The converted result value | |
145 | * | |
146 | * strict_strtoul converts a string to an unsigned long only if the | |
147 | * string is really an unsigned long string, any string containing | |
148 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
149 | * only a newline char at the tail is acceptible because people generally | |
150 | * change a module parameter in the following way: | |
151 | * | |
152 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
153 | * | |
154 | * echo will append a newline to the tail. | |
155 | * | |
156 | * It returns 0 if conversion is successful and *res is set to the converted | |
157 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
158 | * | |
159 | * simple_strtoul just ignores the successive invalid characters and | |
160 | * return the converted value of prefix part of the string. | |
161 | */ | |
9d85db22 HH |
162 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) |
163 | { | |
164 | char *tail; | |
165 | unsigned long val; | |
166 | size_t len; | |
167 | ||
168 | *res = 0; | |
169 | len = strlen(cp); | |
170 | if (len == 0) | |
171 | return -EINVAL; | |
172 | ||
173 | val = simple_strtoul(cp, &tail, base); | |
e899aa82 PM |
174 | if (tail == cp) |
175 | return -EINVAL; | |
9d85db22 HH |
176 | if ((*tail == '\0') || |
177 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
178 | *res = val; | |
179 | return 0; | |
180 | } | |
181 | ||
182 | return -EINVAL; | |
183 | } | |
184 | EXPORT_SYMBOL(strict_strtoul); | |
06b2a76d YY |
185 | |
186 | /** | |
187 | * strict_strtol - convert a string to a long strictly | |
188 | * @cp: The string to be converted | |
189 | * @base: The number base to use | |
190 | * @res: The converted result value | |
191 | * | |
192 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
193 | * character of a string is '-'. | |
194 | * | |
195 | * It returns 0 if conversion is successful and *res is set to the converted | |
196 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
197 | */ | |
9d85db22 HH |
198 | int strict_strtol(const char *cp, unsigned int base, long *res) |
199 | { | |
200 | int ret; | |
201 | if (*cp == '-') { | |
202 | ret = strict_strtoul(cp + 1, base, (unsigned long *)res); | |
203 | if (!ret) | |
204 | *res = -(*res); | |
205 | } else { | |
206 | ret = strict_strtoul(cp, base, (unsigned long *)res); | |
207 | } | |
208 | ||
209 | return ret; | |
210 | } | |
211 | EXPORT_SYMBOL(strict_strtol); | |
06b2a76d YY |
212 | |
213 | /** | |
214 | * strict_strtoull - convert a string to an unsigned long long strictly | |
215 | * @cp: The string to be converted | |
216 | * @base: The number base to use | |
217 | * @res: The converted result value | |
218 | * | |
219 | * strict_strtoull converts a string to an unsigned long long only if the | |
220 | * string is really an unsigned long long string, any string containing | |
221 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
222 | * only a newline char at the tail is acceptible because people generally | |
223 | * change a module parameter in the following way: | |
224 | * | |
225 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
226 | * | |
227 | * echo will append a newline to the tail of the string. | |
228 | * | |
229 | * It returns 0 if conversion is successful and *res is set to the converted | |
230 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
231 | * | |
232 | * simple_strtoull just ignores the successive invalid characters and | |
233 | * return the converted value of prefix part of the string. | |
234 | */ | |
9d85db22 HH |
235 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) |
236 | { | |
237 | char *tail; | |
238 | unsigned long long val; | |
239 | size_t len; | |
240 | ||
241 | *res = 0; | |
242 | len = strlen(cp); | |
243 | if (len == 0) | |
244 | return -EINVAL; | |
245 | ||
246 | val = simple_strtoull(cp, &tail, base); | |
e899aa82 PM |
247 | if (tail == cp) |
248 | return -EINVAL; | |
9d85db22 HH |
249 | if ((*tail == '\0') || |
250 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
251 | *res = val; | |
252 | return 0; | |
253 | } | |
254 | ||
255 | return -EINVAL; | |
256 | } | |
257 | EXPORT_SYMBOL(strict_strtoull); | |
06b2a76d YY |
258 | |
259 | /** | |
260 | * strict_strtoll - convert a string to a long long strictly | |
261 | * @cp: The string to be converted | |
262 | * @base: The number base to use | |
263 | * @res: The converted result value | |
264 | * | |
265 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
266 | * character of a string is '-'. | |
267 | * | |
268 | * It returns 0 if conversion is successful and *res is set to the converted | |
269 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
270 | */ | |
9d85db22 HH |
271 | int strict_strtoll(const char *cp, unsigned int base, long long *res) |
272 | { | |
273 | int ret; | |
274 | if (*cp == '-') { | |
275 | ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); | |
276 | if (!ret) | |
277 | *res = -(*res); | |
278 | } else { | |
279 | ret = strict_strtoull(cp, base, (unsigned long long *)res); | |
280 | } | |
06b2a76d | 281 | |
9d85db22 HH |
282 | return ret; |
283 | } | |
06b2a76d | 284 | EXPORT_SYMBOL(strict_strtoll); |
06b2a76d | 285 | |
1da177e4 LT |
286 | static int skip_atoi(const char **s) |
287 | { | |
288 | int i=0; | |
289 | ||
290 | while (isdigit(**s)) | |
291 | i = i*10 + *((*s)++) - '0'; | |
292 | return i; | |
293 | } | |
294 | ||
4277eedd DV |
295 | /* Decimal conversion is by far the most typical, and is used |
296 | * for /proc and /sys data. This directly impacts e.g. top performance | |
297 | * with many processes running. We optimize it for speed | |
298 | * using code from | |
299 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
300 | * (with permission from the author, Douglas W. Jones). */ | |
301 | ||
302 | /* Formats correctly any integer in [0,99999]. | |
303 | * Outputs from one to five digits depending on input. | |
304 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
305 | static char* put_dec_trunc(char *buf, unsigned q) | |
306 | { | |
307 | unsigned d3, d2, d1, d0; | |
308 | d1 = (q>>4) & 0xf; | |
309 | d2 = (q>>8) & 0xf; | |
310 | d3 = (q>>12); | |
311 | ||
312 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
313 | q = (d0 * 0xcd) >> 11; | |
314 | d0 = d0 - 10*q; | |
315 | *buf++ = d0 + '0'; /* least significant digit */ | |
316 | d1 = q + 9*d3 + 5*d2 + d1; | |
317 | if (d1 != 0) { | |
318 | q = (d1 * 0xcd) >> 11; | |
319 | d1 = d1 - 10*q; | |
320 | *buf++ = d1 + '0'; /* next digit */ | |
321 | ||
322 | d2 = q + 2*d2; | |
323 | if ((d2 != 0) || (d3 != 0)) { | |
324 | q = (d2 * 0xd) >> 7; | |
325 | d2 = d2 - 10*q; | |
326 | *buf++ = d2 + '0'; /* next digit */ | |
327 | ||
328 | d3 = q + 4*d3; | |
329 | if (d3 != 0) { | |
330 | q = (d3 * 0xcd) >> 11; | |
331 | d3 = d3 - 10*q; | |
332 | *buf++ = d3 + '0'; /* next digit */ | |
333 | if (q != 0) | |
334 | *buf++ = q + '0'; /* most sign. digit */ | |
335 | } | |
336 | } | |
337 | } | |
338 | return buf; | |
339 | } | |
340 | /* Same with if's removed. Always emits five digits */ | |
341 | static char* put_dec_full(char *buf, unsigned q) | |
342 | { | |
343 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
344 | /* but anyway, gcc produces better code with full-sized ints */ | |
345 | unsigned d3, d2, d1, d0; | |
346 | d1 = (q>>4) & 0xf; | |
347 | d2 = (q>>8) & 0xf; | |
348 | d3 = (q>>12); | |
349 | ||
350 | /* Possible ways to approx. divide by 10 */ | |
351 | /* gcc -O2 replaces multiply with shifts and adds */ | |
352 | // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
353 | // (x * 0x67) >> 10: 1100111 | |
354 | // (x * 0x34) >> 9: 110100 - same | |
355 | // (x * 0x1a) >> 8: 11010 - same | |
356 | // (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
357 | ||
358 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
359 | q = (d0 * 0xcd) >> 11; | |
360 | d0 = d0 - 10*q; | |
361 | *buf++ = d0 + '0'; | |
362 | d1 = q + 9*d3 + 5*d2 + d1; | |
363 | q = (d1 * 0xcd) >> 11; | |
364 | d1 = d1 - 10*q; | |
365 | *buf++ = d1 + '0'; | |
366 | ||
367 | d2 = q + 2*d2; | |
368 | q = (d2 * 0xd) >> 7; | |
369 | d2 = d2 - 10*q; | |
370 | *buf++ = d2 + '0'; | |
371 | ||
372 | d3 = q + 4*d3; | |
373 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
374 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
375 | d3 = d3 - 10*q; | |
376 | *buf++ = d3 + '0'; | |
377 | *buf++ = q + '0'; | |
378 | return buf; | |
379 | } | |
380 | /* No inlining helps gcc to use registers better */ | |
381 | static noinline char* put_dec(char *buf, unsigned long long num) | |
382 | { | |
383 | while (1) { | |
384 | unsigned rem; | |
385 | if (num < 100000) | |
386 | return put_dec_trunc(buf, num); | |
387 | rem = do_div(num, 100000); | |
388 | buf = put_dec_full(buf, rem); | |
389 | } | |
390 | } | |
391 | ||
1da177e4 LT |
392 | #define ZEROPAD 1 /* pad with zero */ |
393 | #define SIGN 2 /* unsigned/signed long */ | |
394 | #define PLUS 4 /* show plus */ | |
395 | #define SPACE 8 /* space if plus */ | |
396 | #define LEFT 16 /* left justified */ | |
9b706aee DV |
397 | #define SMALL 32 /* Must be 32 == 0x20 */ |
398 | #define SPECIAL 64 /* 0x */ | |
1da177e4 | 399 | |
fef20d9c FW |
400 | enum format_type { |
401 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 402 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
403 | FORMAT_TYPE_PRECISION, |
404 | FORMAT_TYPE_CHAR, | |
405 | FORMAT_TYPE_STR, | |
406 | FORMAT_TYPE_PTR, | |
407 | FORMAT_TYPE_PERCENT_CHAR, | |
408 | FORMAT_TYPE_INVALID, | |
409 | FORMAT_TYPE_LONG_LONG, | |
410 | FORMAT_TYPE_ULONG, | |
411 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
412 | FORMAT_TYPE_UBYTE, |
413 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
414 | FORMAT_TYPE_USHORT, |
415 | FORMAT_TYPE_SHORT, | |
416 | FORMAT_TYPE_UINT, | |
417 | FORMAT_TYPE_INT, | |
418 | FORMAT_TYPE_NRCHARS, | |
419 | FORMAT_TYPE_SIZE_T, | |
420 | FORMAT_TYPE_PTRDIFF | |
421 | }; | |
422 | ||
423 | struct printf_spec { | |
424 | enum format_type type; | |
425 | int flags; /* flags to number() */ | |
426 | int field_width; /* width of output field */ | |
427 | int base; | |
428 | int precision; /* # of digits/chars */ | |
429 | int qualifier; | |
430 | }; | |
431 | ||
432 | static char *number(char *buf, char *end, unsigned long long num, | |
433 | struct printf_spec spec) | |
1da177e4 | 434 | { |
9b706aee DV |
435 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
436 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
437 | ||
438 | char tmp[66]; | |
439 | char sign; | |
440 | char locase; | |
fef20d9c | 441 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 LT |
442 | int i; |
443 | ||
9b706aee DV |
444 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
445 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
446 | locase = (spec.flags & SMALL); |
447 | if (spec.flags & LEFT) | |
448 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 449 | sign = 0; |
fef20d9c | 450 | if (spec.flags & SIGN) { |
1da177e4 LT |
451 | if ((signed long long) num < 0) { |
452 | sign = '-'; | |
453 | num = - (signed long long) num; | |
fef20d9c FW |
454 | spec.field_width--; |
455 | } else if (spec.flags & PLUS) { | |
1da177e4 | 456 | sign = '+'; |
fef20d9c FW |
457 | spec.field_width--; |
458 | } else if (spec.flags & SPACE) { | |
1da177e4 | 459 | sign = ' '; |
fef20d9c | 460 | spec.field_width--; |
1da177e4 LT |
461 | } |
462 | } | |
b39a7340 | 463 | if (need_pfx) { |
fef20d9c FW |
464 | spec.field_width--; |
465 | if (spec.base == 16) | |
466 | spec.field_width--; | |
1da177e4 | 467 | } |
b39a7340 DV |
468 | |
469 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
470 | i = 0; |
471 | if (num == 0) | |
b39a7340 | 472 | tmp[i++] = '0'; |
4277eedd DV |
473 | /* Generic code, for any base: |
474 | else do { | |
9b706aee | 475 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
476 | } while (num != 0); |
477 | */ | |
fef20d9c FW |
478 | else if (spec.base != 10) { /* 8 or 16 */ |
479 | int mask = spec.base - 1; | |
b39a7340 | 480 | int shift = 3; |
fef20d9c | 481 | if (spec.base == 16) shift = 4; |
b39a7340 | 482 | do { |
9b706aee | 483 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
484 | num >>= shift; |
485 | } while (num); | |
4277eedd DV |
486 | } else { /* base 10 */ |
487 | i = put_dec(tmp, num) - tmp; | |
488 | } | |
b39a7340 DV |
489 | |
490 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
491 | if (i > spec.precision) |
492 | spec.precision = i; | |
b39a7340 | 493 | /* leading space padding */ |
fef20d9c FW |
494 | spec.field_width -= spec.precision; |
495 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
496 | while(--spec.field_width >= 0) { | |
f796937a | 497 | if (buf < end) |
1da177e4 LT |
498 | *buf = ' '; |
499 | ++buf; | |
500 | } | |
501 | } | |
b39a7340 | 502 | /* sign */ |
1da177e4 | 503 | if (sign) { |
f796937a | 504 | if (buf < end) |
1da177e4 LT |
505 | *buf = sign; |
506 | ++buf; | |
507 | } | |
b39a7340 DV |
508 | /* "0x" / "0" prefix */ |
509 | if (need_pfx) { | |
510 | if (buf < end) | |
511 | *buf = '0'; | |
512 | ++buf; | |
fef20d9c | 513 | if (spec.base == 16) { |
f796937a | 514 | if (buf < end) |
9b706aee | 515 | *buf = ('X' | locase); |
1da177e4 LT |
516 | ++buf; |
517 | } | |
518 | } | |
b39a7340 | 519 | /* zero or space padding */ |
fef20d9c FW |
520 | if (!(spec.flags & LEFT)) { |
521 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
522 | while (--spec.field_width >= 0) { | |
f796937a | 523 | if (buf < end) |
1da177e4 LT |
524 | *buf = c; |
525 | ++buf; | |
526 | } | |
527 | } | |
b39a7340 | 528 | /* hmm even more zero padding? */ |
fef20d9c | 529 | while (i <= --spec.precision) { |
f796937a | 530 | if (buf < end) |
1da177e4 LT |
531 | *buf = '0'; |
532 | ++buf; | |
533 | } | |
b39a7340 DV |
534 | /* actual digits of result */ |
535 | while (--i >= 0) { | |
f796937a | 536 | if (buf < end) |
1da177e4 LT |
537 | *buf = tmp[i]; |
538 | ++buf; | |
539 | } | |
b39a7340 | 540 | /* trailing space padding */ |
fef20d9c | 541 | while (--spec.field_width >= 0) { |
f796937a | 542 | if (buf < end) |
1da177e4 LT |
543 | *buf = ' '; |
544 | ++buf; | |
545 | } | |
546 | return buf; | |
547 | } | |
548 | ||
fef20d9c | 549 | static char *string(char *buf, char *end, char *s, struct printf_spec spec) |
0f9bfa56 LT |
550 | { |
551 | int len, i; | |
552 | ||
553 | if ((unsigned long)s < PAGE_SIZE) | |
554 | s = "<NULL>"; | |
555 | ||
fef20d9c | 556 | len = strnlen(s, spec.precision); |
0f9bfa56 | 557 | |
fef20d9c FW |
558 | if (!(spec.flags & LEFT)) { |
559 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
560 | if (buf < end) |
561 | *buf = ' '; | |
562 | ++buf; | |
563 | } | |
564 | } | |
565 | for (i = 0; i < len; ++i) { | |
566 | if (buf < end) | |
567 | *buf = *s; | |
568 | ++buf; ++s; | |
569 | } | |
fef20d9c | 570 | while (len < spec.field_width--) { |
0f9bfa56 LT |
571 | if (buf < end) |
572 | *buf = ' '; | |
573 | ++buf; | |
574 | } | |
575 | return buf; | |
576 | } | |
577 | ||
fef20d9c | 578 | static char *symbol_string(char *buf, char *end, void *ptr, |
0c8b946e | 579 | struct printf_spec spec, char ext) |
0fe1ef24 LT |
580 | { |
581 | unsigned long value = (unsigned long) ptr; | |
582 | #ifdef CONFIG_KALLSYMS | |
583 | char sym[KSYM_SYMBOL_LEN]; | |
91adcd2c | 584 | if (ext != 'f' && ext != 's') |
0c8b946e FW |
585 | sprint_symbol(sym, value); |
586 | else | |
587 | kallsyms_lookup(value, NULL, NULL, NULL, sym); | |
fef20d9c | 588 | return string(buf, end, sym, spec); |
0fe1ef24 | 589 | #else |
fef20d9c FW |
590 | spec.field_width = 2*sizeof(void *); |
591 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
592 | spec.base = 16; | |
593 | return number(buf, end, value, spec); | |
0fe1ef24 LT |
594 | #endif |
595 | } | |
596 | ||
fef20d9c FW |
597 | static char *resource_string(char *buf, char *end, struct resource *res, |
598 | struct printf_spec spec) | |
332d2e78 LT |
599 | { |
600 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 601 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
602 | #endif |
603 | ||
604 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 605 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 606 | #endif |
fef20d9c FW |
607 | struct printf_spec num_spec = { |
608 | .base = 16, | |
609 | .precision = -1, | |
610 | .flags = SPECIAL | SMALL | ZEROPAD, | |
611 | }; | |
332d2e78 LT |
612 | /* room for the actual numbers, the two "0x", -, [, ] and the final zero */ |
613 | char sym[4*sizeof(resource_size_t) + 8]; | |
614 | char *p = sym, *pend = sym + sizeof(sym); | |
615 | int size = -1; | |
616 | ||
617 | if (res->flags & IORESOURCE_IO) | |
618 | size = IO_RSRC_PRINTK_SIZE; | |
619 | else if (res->flags & IORESOURCE_MEM) | |
620 | size = MEM_RSRC_PRINTK_SIZE; | |
621 | ||
622 | *p++ = '['; | |
fef20d9c FW |
623 | num_spec.field_width = size; |
624 | p = number(p, pend, res->start, num_spec); | |
332d2e78 | 625 | *p++ = '-'; |
fef20d9c | 626 | p = number(p, pend, res->end, num_spec); |
332d2e78 LT |
627 | *p++ = ']'; |
628 | *p = 0; | |
629 | ||
fef20d9c | 630 | return string(buf, end, sym, spec); |
332d2e78 LT |
631 | } |
632 | ||
fef20d9c | 633 | static char *mac_address_string(char *buf, char *end, u8 *addr, |
8a27f7c9 | 634 | struct printf_spec spec, const char *fmt) |
dd45c9cf | 635 | { |
8a27f7c9 | 636 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
637 | char *p = mac_addr; |
638 | int i; | |
639 | ||
640 | for (i = 0; i < 6; i++) { | |
641 | p = pack_hex_byte(p, addr[i]); | |
8a27f7c9 | 642 | if (fmt[0] == 'M' && i != 5) |
dd45c9cf HH |
643 | *p++ = ':'; |
644 | } | |
645 | *p = '\0'; | |
646 | ||
fef20d9c | 647 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
648 | } |
649 | ||
8a27f7c9 JP |
650 | static char *ip4_string(char *p, const u8 *addr, bool leading_zeros) |
651 | { | |
652 | int i; | |
653 | ||
654 | for (i = 0; i < 4; i++) { | |
655 | char temp[3]; /* hold each IP quad in reverse order */ | |
656 | int digits = put_dec_trunc(temp, addr[i]) - temp; | |
657 | if (leading_zeros) { | |
658 | if (digits < 3) | |
659 | *p++ = '0'; | |
660 | if (digits < 2) | |
661 | *p++ = '0'; | |
662 | } | |
663 | /* reverse the digits in the quad */ | |
664 | while (digits--) | |
665 | *p++ = temp[digits]; | |
666 | if (i < 3) | |
667 | *p++ = '.'; | |
668 | } | |
669 | ||
670 | *p = '\0'; | |
671 | return p; | |
672 | } | |
673 | ||
eb78cd26 | 674 | static char *ip6_compressed_string(char *p, const char *addr) |
689afa7d | 675 | { |
689afa7d | 676 | int i; |
8a27f7c9 JP |
677 | int j; |
678 | int range; | |
679 | unsigned char zerolength[8]; | |
680 | int longest = 1; | |
681 | int colonpos = -1; | |
682 | u16 word; | |
683 | u8 hi; | |
684 | u8 lo; | |
685 | bool needcolon = false; | |
eb78cd26 JP |
686 | bool useIPv4; |
687 | struct in6_addr in6; | |
688 | ||
689 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
690 | ||
691 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
692 | |
693 | memset(zerolength, 0, sizeof(zerolength)); | |
694 | ||
695 | if (useIPv4) | |
696 | range = 6; | |
697 | else | |
698 | range = 8; | |
699 | ||
700 | /* find position of longest 0 run */ | |
701 | for (i = 0; i < range; i++) { | |
702 | for (j = i; j < range; j++) { | |
eb78cd26 | 703 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
704 | break; |
705 | zerolength[i]++; | |
706 | } | |
707 | } | |
708 | for (i = 0; i < range; i++) { | |
709 | if (zerolength[i] > longest) { | |
710 | longest = zerolength[i]; | |
711 | colonpos = i; | |
712 | } | |
713 | } | |
689afa7d | 714 | |
8a27f7c9 JP |
715 | /* emit address */ |
716 | for (i = 0; i < range; i++) { | |
717 | if (i == colonpos) { | |
718 | if (needcolon || i == 0) | |
719 | *p++ = ':'; | |
720 | *p++ = ':'; | |
721 | needcolon = false; | |
722 | i += longest - 1; | |
723 | continue; | |
724 | } | |
725 | if (needcolon) { | |
726 | *p++ = ':'; | |
727 | needcolon = false; | |
728 | } | |
729 | /* hex u16 without leading 0s */ | |
eb78cd26 | 730 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
731 | hi = word >> 8; |
732 | lo = word & 0xff; | |
733 | if (hi) { | |
734 | if (hi > 0x0f) | |
735 | p = pack_hex_byte(p, hi); | |
736 | else | |
737 | *p++ = hex_asc_lo(hi); | |
738 | } | |
739 | if (hi || lo > 0x0f) | |
740 | p = pack_hex_byte(p, lo); | |
741 | else | |
742 | *p++ = hex_asc_lo(lo); | |
743 | needcolon = true; | |
744 | } | |
745 | ||
746 | if (useIPv4) { | |
747 | if (needcolon) | |
748 | *p++ = ':'; | |
eb78cd26 | 749 | p = ip4_string(p, &in6.s6_addr[12], false); |
8a27f7c9 JP |
750 | } |
751 | ||
752 | *p = '\0'; | |
753 | return p; | |
754 | } | |
755 | ||
eb78cd26 | 756 | static char *ip6_string(char *p, const char *addr, const char *fmt) |
8a27f7c9 JP |
757 | { |
758 | int i; | |
689afa7d | 759 | for (i = 0; i < 8; i++) { |
eb78cd26 JP |
760 | p = pack_hex_byte(p, *addr++); |
761 | p = pack_hex_byte(p, *addr++); | |
8a27f7c9 | 762 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
763 | *p++ = ':'; |
764 | } | |
8a27f7c9 | 765 | |
689afa7d | 766 | *p = '\0'; |
8a27f7c9 JP |
767 | return p; |
768 | } | |
769 | ||
770 | static char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
771 | struct printf_spec spec, const char *fmt) | |
772 | { | |
773 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
774 | ||
775 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 776 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 777 | else |
eb78cd26 | 778 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 779 | |
fef20d9c | 780 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
781 | } |
782 | ||
8a27f7c9 JP |
783 | static char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
784 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 785 | { |
8a27f7c9 | 786 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 787 | |
8a27f7c9 | 788 | ip4_string(ip4_addr, addr, fmt[0] == 'i'); |
4aa99606 | 789 | |
fef20d9c | 790 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
791 | } |
792 | ||
4d8a743c LT |
793 | /* |
794 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
795 | * by an extra set of alphanumeric characters that are extended format | |
796 | * specifiers. | |
797 | * | |
332d2e78 LT |
798 | * Right now we handle: |
799 | * | |
0c8b946e FW |
800 | * - 'F' For symbolic function descriptor pointers with offset |
801 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
802 | * - 'S' For symbolic direct pointers with offset |
803 | * - 's' For symbolic direct pointers without offset | |
332d2e78 LT |
804 | * - 'R' For a struct resource pointer, it prints the range of |
805 | * addresses (not the name nor the flags) | |
dd45c9cf HH |
806 | * - 'M' For a 6-byte MAC address, it prints the address in the |
807 | * usual colon-separated hex notation | |
8a27f7c9 JP |
808 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
809 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way | |
810 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
811 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
812 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
813 | * IPv6 omits the colons (01020304...0f) | |
814 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
815 | * - 'I6c' for IPv6 addresses printed as specified by | |
816 | * http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt | |
332d2e78 LT |
817 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
818 | * function pointers are really function descriptors, which contain a | |
819 | * pointer to the real address. | |
4d8a743c | 820 | */ |
fef20d9c FW |
821 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
822 | struct printf_spec spec) | |
78a8bf69 | 823 | { |
d97106ab | 824 | if (!ptr) |
fef20d9c | 825 | return string(buf, end, "(null)", spec); |
d97106ab | 826 | |
0fe1ef24 LT |
827 | switch (*fmt) { |
828 | case 'F': | |
0c8b946e | 829 | case 'f': |
0fe1ef24 | 830 | ptr = dereference_function_descriptor(ptr); |
91adcd2c | 831 | case 's': |
0fe1ef24 LT |
832 | /* Fallthrough */ |
833 | case 'S': | |
0c8b946e | 834 | return symbol_string(buf, end, ptr, spec, *fmt); |
332d2e78 | 835 | case 'R': |
fef20d9c | 836 | return resource_string(buf, end, ptr, spec); |
8a27f7c9 JP |
837 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
838 | case 'm': /* Contiguous: 000102030405 */ | |
839 | return mac_address_string(buf, end, ptr, spec, fmt); | |
840 | case 'I': /* Formatted IP supported | |
841 | * 4: 1.2.3.4 | |
842 | * 6: 0001:0203:...:0708 | |
843 | * 6c: 1::708 or 1::1.2.3.4 | |
844 | */ | |
845 | case 'i': /* Contiguous: | |
846 | * 4: 001.002.003.004 | |
847 | * 6: 000102...0f | |
848 | */ | |
849 | switch (fmt[1]) { | |
850 | case '6': | |
851 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
852 | case '4': | |
853 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
854 | } | |
fef20d9c FW |
855 | break; |
856 | } | |
857 | spec.flags |= SMALL; | |
858 | if (spec.field_width == -1) { | |
859 | spec.field_width = 2*sizeof(void *); | |
860 | spec.flags |= ZEROPAD; | |
861 | } | |
862 | spec.base = 16; | |
863 | ||
864 | return number(buf, end, (unsigned long) ptr, spec); | |
865 | } | |
866 | ||
867 | /* | |
868 | * Helper function to decode printf style format. | |
869 | * Each call decode a token from the format and return the | |
870 | * number of characters read (or likely the delta where it wants | |
871 | * to go on the next call). | |
872 | * The decoded token is returned through the parameters | |
873 | * | |
874 | * 'h', 'l', or 'L' for integer fields | |
875 | * 'z' support added 23/7/1999 S.H. | |
876 | * 'z' changed to 'Z' --davidm 1/25/99 | |
877 | * 't' added for ptrdiff_t | |
878 | * | |
879 | * @fmt: the format string | |
880 | * @type of the token returned | |
881 | * @flags: various flags such as +, -, # tokens.. | |
882 | * @field_width: overwritten width | |
883 | * @base: base of the number (octal, hex, ...) | |
884 | * @precision: precision of a number | |
885 | * @qualifier: qualifier of a number (long, size_t, ...) | |
886 | */ | |
887 | static int format_decode(const char *fmt, struct printf_spec *spec) | |
888 | { | |
889 | const char *start = fmt; | |
fef20d9c FW |
890 | |
891 | /* we finished early by reading the field width */ | |
ed681a91 | 892 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
893 | if (spec->field_width < 0) { |
894 | spec->field_width = -spec->field_width; | |
895 | spec->flags |= LEFT; | |
896 | } | |
897 | spec->type = FORMAT_TYPE_NONE; | |
898 | goto precision; | |
899 | } | |
900 | ||
901 | /* we finished early by reading the precision */ | |
902 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
903 | if (spec->precision < 0) | |
904 | spec->precision = 0; | |
905 | ||
906 | spec->type = FORMAT_TYPE_NONE; | |
907 | goto qualifier; | |
908 | } | |
909 | ||
910 | /* By default */ | |
911 | spec->type = FORMAT_TYPE_NONE; | |
912 | ||
913 | for (; *fmt ; ++fmt) { | |
914 | if (*fmt == '%') | |
915 | break; | |
916 | } | |
917 | ||
918 | /* Return the current non-format string */ | |
919 | if (fmt != start || !*fmt) | |
920 | return fmt - start; | |
921 | ||
922 | /* Process flags */ | |
923 | spec->flags = 0; | |
924 | ||
925 | while (1) { /* this also skips first '%' */ | |
926 | bool found = true; | |
927 | ||
928 | ++fmt; | |
929 | ||
930 | switch (*fmt) { | |
931 | case '-': spec->flags |= LEFT; break; | |
932 | case '+': spec->flags |= PLUS; break; | |
933 | case ' ': spec->flags |= SPACE; break; | |
934 | case '#': spec->flags |= SPECIAL; break; | |
935 | case '0': spec->flags |= ZEROPAD; break; | |
936 | default: found = false; | |
937 | } | |
938 | ||
939 | if (!found) | |
940 | break; | |
941 | } | |
942 | ||
943 | /* get field width */ | |
944 | spec->field_width = -1; | |
945 | ||
946 | if (isdigit(*fmt)) | |
947 | spec->field_width = skip_atoi(&fmt); | |
948 | else if (*fmt == '*') { | |
949 | /* it's the next argument */ | |
ed681a91 | 950 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
951 | return ++fmt - start; |
952 | } | |
953 | ||
954 | precision: | |
955 | /* get the precision */ | |
956 | spec->precision = -1; | |
957 | if (*fmt == '.') { | |
958 | ++fmt; | |
959 | if (isdigit(*fmt)) { | |
960 | spec->precision = skip_atoi(&fmt); | |
961 | if (spec->precision < 0) | |
962 | spec->precision = 0; | |
963 | } else if (*fmt == '*') { | |
964 | /* it's the next argument */ | |
adf26f84 | 965 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
966 | return ++fmt - start; |
967 | } | |
968 | } | |
969 | ||
970 | qualifier: | |
971 | /* get the conversion qualifier */ | |
972 | spec->qualifier = -1; | |
973 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
974 | *fmt == 'Z' || *fmt == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
975 | spec->qualifier = *fmt++; |
976 | if (unlikely(spec->qualifier == *fmt)) { | |
977 | if (spec->qualifier == 'l') { | |
978 | spec->qualifier = 'L'; | |
979 | ++fmt; | |
980 | } else if (spec->qualifier == 'h') { | |
981 | spec->qualifier = 'H'; | |
982 | ++fmt; | |
983 | } | |
fef20d9c FW |
984 | } |
985 | } | |
986 | ||
987 | /* default base */ | |
988 | spec->base = 10; | |
989 | switch (*fmt) { | |
990 | case 'c': | |
991 | spec->type = FORMAT_TYPE_CHAR; | |
992 | return ++fmt - start; | |
993 | ||
994 | case 's': | |
995 | spec->type = FORMAT_TYPE_STR; | |
996 | return ++fmt - start; | |
997 | ||
998 | case 'p': | |
999 | spec->type = FORMAT_TYPE_PTR; | |
1000 | return fmt - start; | |
1001 | /* skip alnum */ | |
1002 | ||
1003 | case 'n': | |
1004 | spec->type = FORMAT_TYPE_NRCHARS; | |
1005 | return ++fmt - start; | |
1006 | ||
1007 | case '%': | |
1008 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1009 | return ++fmt - start; | |
1010 | ||
1011 | /* integer number formats - set up the flags and "break" */ | |
1012 | case 'o': | |
1013 | spec->base = 8; | |
1014 | break; | |
1015 | ||
1016 | case 'x': | |
1017 | spec->flags |= SMALL; | |
1018 | ||
1019 | case 'X': | |
1020 | spec->base = 16; | |
1021 | break; | |
1022 | ||
1023 | case 'd': | |
1024 | case 'i': | |
39e874f8 | 1025 | spec->flags |= SIGN; |
fef20d9c | 1026 | case 'u': |
4aa99606 | 1027 | break; |
fef20d9c FW |
1028 | |
1029 | default: | |
1030 | spec->type = FORMAT_TYPE_INVALID; | |
1031 | return fmt - start; | |
0fe1ef24 | 1032 | } |
fef20d9c FW |
1033 | |
1034 | if (spec->qualifier == 'L') | |
1035 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1036 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1037 | if (spec->flags & SIGN) |
fef20d9c FW |
1038 | spec->type = FORMAT_TYPE_LONG; |
1039 | else | |
1040 | spec->type = FORMAT_TYPE_ULONG; | |
1041 | } else if (spec->qualifier == 'Z' || spec->qualifier == 'z') { | |
1042 | spec->type = FORMAT_TYPE_SIZE_T; | |
1043 | } else if (spec->qualifier == 't') { | |
1044 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1045 | } else if (spec->qualifier == 'H') { |
1046 | if (spec->flags & SIGN) | |
1047 | spec->type = FORMAT_TYPE_BYTE; | |
1048 | else | |
1049 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1050 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1051 | if (spec->flags & SIGN) |
fef20d9c FW |
1052 | spec->type = FORMAT_TYPE_SHORT; |
1053 | else | |
1054 | spec->type = FORMAT_TYPE_USHORT; | |
1055 | } else { | |
39e874f8 | 1056 | if (spec->flags & SIGN) |
fef20d9c FW |
1057 | spec->type = FORMAT_TYPE_INT; |
1058 | else | |
1059 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1060 | } |
fef20d9c FW |
1061 | |
1062 | return ++fmt - start; | |
78a8bf69 LT |
1063 | } |
1064 | ||
1da177e4 LT |
1065 | /** |
1066 | * vsnprintf - Format a string and place it in a buffer | |
1067 | * @buf: The buffer to place the result into | |
1068 | * @size: The size of the buffer, including the trailing null space | |
1069 | * @fmt: The format string to use | |
1070 | * @args: Arguments for the format string | |
1071 | * | |
20036fdc | 1072 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1073 | * %pS output the name of a text symbol with offset |
1074 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1075 | * %pF output the name of a function pointer with its offset |
1076 | * %pf output the name of a function pointer without its offset | |
332d2e78 | 1077 | * %pR output the address range in a struct resource |
0efb4d20 | 1078 | * %n is ignored |
20036fdc | 1079 | * |
1da177e4 LT |
1080 | * The return value is the number of characters which would |
1081 | * be generated for the given input, excluding the trailing | |
1082 | * '\0', as per ISO C99. If you want to have the exact | |
1083 | * number of characters written into @buf as return value | |
72fd4a35 | 1084 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1085 | * return is greater than or equal to @size, the resulting |
1086 | * string is truncated. | |
1087 | * | |
1088 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1089 | * You probably want snprintf() instead. |
1da177e4 LT |
1090 | */ |
1091 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1092 | { | |
1da177e4 | 1093 | unsigned long long num; |
1da177e4 | 1094 | char *str, *end, c; |
fef20d9c FW |
1095 | int read; |
1096 | struct printf_spec spec = {0}; | |
1da177e4 | 1097 | |
f796937a JF |
1098 | /* Reject out-of-range values early. Large positive sizes are |
1099 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1100 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1101 | return 0; |
1da177e4 LT |
1102 | |
1103 | str = buf; | |
f796937a | 1104 | end = buf + size; |
1da177e4 | 1105 | |
f796937a JF |
1106 | /* Make sure end is always >= buf */ |
1107 | if (end < buf) { | |
1108 | end = ((void *)-1); | |
1109 | size = end - buf; | |
1da177e4 LT |
1110 | } |
1111 | ||
fef20d9c FW |
1112 | while (*fmt) { |
1113 | const char *old_fmt = fmt; | |
1da177e4 | 1114 | |
fef20d9c | 1115 | read = format_decode(fmt, &spec); |
1da177e4 | 1116 | |
fef20d9c | 1117 | fmt += read; |
1da177e4 | 1118 | |
fef20d9c FW |
1119 | switch (spec.type) { |
1120 | case FORMAT_TYPE_NONE: { | |
1121 | int copy = read; | |
1122 | if (str < end) { | |
1123 | if (copy > end - str) | |
1124 | copy = end - str; | |
1125 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1126 | } |
fef20d9c FW |
1127 | str += read; |
1128 | break; | |
1da177e4 LT |
1129 | } |
1130 | ||
ed681a91 | 1131 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1132 | spec.field_width = va_arg(args, int); |
1133 | break; | |
1da177e4 | 1134 | |
fef20d9c FW |
1135 | case FORMAT_TYPE_PRECISION: |
1136 | spec.precision = va_arg(args, int); | |
1137 | break; | |
1da177e4 | 1138 | |
fef20d9c FW |
1139 | case FORMAT_TYPE_CHAR: |
1140 | if (!(spec.flags & LEFT)) { | |
1141 | while (--spec.field_width > 0) { | |
f796937a | 1142 | if (str < end) |
1da177e4 LT |
1143 | *str = ' '; |
1144 | ++str; | |
1da177e4 | 1145 | |
fef20d9c FW |
1146 | } |
1147 | } | |
1148 | c = (unsigned char) va_arg(args, int); | |
1149 | if (str < end) | |
1150 | *str = c; | |
1151 | ++str; | |
1152 | while (--spec.field_width > 0) { | |
f796937a | 1153 | if (str < end) |
fef20d9c | 1154 | *str = ' '; |
1da177e4 | 1155 | ++str; |
fef20d9c FW |
1156 | } |
1157 | break; | |
1da177e4 | 1158 | |
fef20d9c FW |
1159 | case FORMAT_TYPE_STR: |
1160 | str = string(str, end, va_arg(args, char *), spec); | |
1161 | break; | |
1da177e4 | 1162 | |
fef20d9c FW |
1163 | case FORMAT_TYPE_PTR: |
1164 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1165 | spec); | |
1166 | while (isalnum(*fmt)) | |
1167 | fmt++; | |
1168 | break; | |
1da177e4 | 1169 | |
fef20d9c FW |
1170 | case FORMAT_TYPE_PERCENT_CHAR: |
1171 | if (str < end) | |
1172 | *str = '%'; | |
1173 | ++str; | |
1174 | break; | |
1da177e4 | 1175 | |
fef20d9c FW |
1176 | case FORMAT_TYPE_INVALID: |
1177 | if (str < end) | |
1178 | *str = '%'; | |
1179 | ++str; | |
fef20d9c FW |
1180 | break; |
1181 | ||
1182 | case FORMAT_TYPE_NRCHARS: { | |
1183 | int qualifier = spec.qualifier; | |
1184 | ||
1185 | if (qualifier == 'l') { | |
1186 | long *ip = va_arg(args, long *); | |
1187 | *ip = (str - buf); | |
1188 | } else if (qualifier == 'Z' || | |
1189 | qualifier == 'z') { | |
1190 | size_t *ip = va_arg(args, size_t *); | |
1191 | *ip = (str - buf); | |
1192 | } else { | |
1193 | int *ip = va_arg(args, int *); | |
1194 | *ip = (str - buf); | |
1195 | } | |
1196 | break; | |
1da177e4 | 1197 | } |
fef20d9c FW |
1198 | |
1199 | default: | |
1200 | switch (spec.type) { | |
1201 | case FORMAT_TYPE_LONG_LONG: | |
1202 | num = va_arg(args, long long); | |
1203 | break; | |
1204 | case FORMAT_TYPE_ULONG: | |
1205 | num = va_arg(args, unsigned long); | |
1206 | break; | |
1207 | case FORMAT_TYPE_LONG: | |
1208 | num = va_arg(args, long); | |
1209 | break; | |
1210 | case FORMAT_TYPE_SIZE_T: | |
1211 | num = va_arg(args, size_t); | |
1212 | break; | |
1213 | case FORMAT_TYPE_PTRDIFF: | |
1214 | num = va_arg(args, ptrdiff_t); | |
1215 | break; | |
a4e94ef0 Z |
1216 | case FORMAT_TYPE_UBYTE: |
1217 | num = (unsigned char) va_arg(args, int); | |
1218 | break; | |
1219 | case FORMAT_TYPE_BYTE: | |
1220 | num = (signed char) va_arg(args, int); | |
1221 | break; | |
fef20d9c FW |
1222 | case FORMAT_TYPE_USHORT: |
1223 | num = (unsigned short) va_arg(args, int); | |
1224 | break; | |
1225 | case FORMAT_TYPE_SHORT: | |
1226 | num = (short) va_arg(args, int); | |
1227 | break; | |
39e874f8 FW |
1228 | case FORMAT_TYPE_INT: |
1229 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1230 | break; |
1231 | default: | |
1232 | num = va_arg(args, unsigned int); | |
1233 | } | |
1234 | ||
1235 | str = number(str, end, num, spec); | |
1da177e4 | 1236 | } |
1da177e4 | 1237 | } |
fef20d9c | 1238 | |
f796937a JF |
1239 | if (size > 0) { |
1240 | if (str < end) | |
1241 | *str = '\0'; | |
1242 | else | |
0a6047ee | 1243 | end[-1] = '\0'; |
f796937a | 1244 | } |
fef20d9c | 1245 | |
f796937a | 1246 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1247 | return str-buf; |
fef20d9c | 1248 | |
1da177e4 | 1249 | } |
1da177e4 LT |
1250 | EXPORT_SYMBOL(vsnprintf); |
1251 | ||
1252 | /** | |
1253 | * vscnprintf - Format a string and place it in a buffer | |
1254 | * @buf: The buffer to place the result into | |
1255 | * @size: The size of the buffer, including the trailing null space | |
1256 | * @fmt: The format string to use | |
1257 | * @args: Arguments for the format string | |
1258 | * | |
1259 | * The return value is the number of characters which have been written into | |
1260 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
1261 | * returns 0. | |
1262 | * | |
1263 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1264 | * You probably want scnprintf() instead. |
20036fdc AK |
1265 | * |
1266 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1267 | */ |
1268 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1269 | { | |
1270 | int i; | |
1271 | ||
1272 | i=vsnprintf(buf,size,fmt,args); | |
1273 | return (i >= size) ? (size - 1) : i; | |
1274 | } | |
1da177e4 LT |
1275 | EXPORT_SYMBOL(vscnprintf); |
1276 | ||
1277 | /** | |
1278 | * snprintf - Format a string and place it in a buffer | |
1279 | * @buf: The buffer to place the result into | |
1280 | * @size: The size of the buffer, including the trailing null space | |
1281 | * @fmt: The format string to use | |
1282 | * @...: Arguments for the format string | |
1283 | * | |
1284 | * The return value is the number of characters which would be | |
1285 | * generated for the given input, excluding the trailing null, | |
1286 | * as per ISO C99. If the return is greater than or equal to | |
1287 | * @size, the resulting string is truncated. | |
20036fdc AK |
1288 | * |
1289 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1290 | */ |
1291 | int snprintf(char * buf, size_t size, const char *fmt, ...) | |
1292 | { | |
1293 | va_list args; | |
1294 | int i; | |
1295 | ||
1296 | va_start(args, fmt); | |
1297 | i=vsnprintf(buf,size,fmt,args); | |
1298 | va_end(args); | |
1299 | return i; | |
1300 | } | |
1da177e4 LT |
1301 | EXPORT_SYMBOL(snprintf); |
1302 | ||
1303 | /** | |
1304 | * scnprintf - Format a string and place it in a buffer | |
1305 | * @buf: The buffer to place the result into | |
1306 | * @size: The size of the buffer, including the trailing null space | |
1307 | * @fmt: The format string to use | |
1308 | * @...: Arguments for the format string | |
1309 | * | |
1310 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 1311 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
1312 | */ |
1313 | ||
1314 | int scnprintf(char * buf, size_t size, const char *fmt, ...) | |
1315 | { | |
1316 | va_list args; | |
1317 | int i; | |
1318 | ||
1319 | va_start(args, fmt); | |
1320 | i = vsnprintf(buf, size, fmt, args); | |
1321 | va_end(args); | |
1322 | return (i >= size) ? (size - 1) : i; | |
1323 | } | |
1324 | EXPORT_SYMBOL(scnprintf); | |
1325 | ||
1326 | /** | |
1327 | * vsprintf - Format a string and place it in a buffer | |
1328 | * @buf: The buffer to place the result into | |
1329 | * @fmt: The format string to use | |
1330 | * @args: Arguments for the format string | |
1331 | * | |
1332 | * The function returns the number of characters written | |
72fd4a35 | 1333 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1334 | * buffer overflows. |
1335 | * | |
1336 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1337 | * You probably want sprintf() instead. |
20036fdc AK |
1338 | * |
1339 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1340 | */ |
1341 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1342 | { | |
1343 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1344 | } | |
1da177e4 LT |
1345 | EXPORT_SYMBOL(vsprintf); |
1346 | ||
1347 | /** | |
1348 | * sprintf - Format a string and place it in a buffer | |
1349 | * @buf: The buffer to place the result into | |
1350 | * @fmt: The format string to use | |
1351 | * @...: Arguments for the format string | |
1352 | * | |
1353 | * The function returns the number of characters written | |
72fd4a35 | 1354 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1355 | * buffer overflows. |
20036fdc AK |
1356 | * |
1357 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1358 | */ |
1359 | int sprintf(char * buf, const char *fmt, ...) | |
1360 | { | |
1361 | va_list args; | |
1362 | int i; | |
1363 | ||
1364 | va_start(args, fmt); | |
1365 | i=vsnprintf(buf, INT_MAX, fmt, args); | |
1366 | va_end(args); | |
1367 | return i; | |
1368 | } | |
1da177e4 LT |
1369 | EXPORT_SYMBOL(sprintf); |
1370 | ||
4370aa4a LJ |
1371 | #ifdef CONFIG_BINARY_PRINTF |
1372 | /* | |
1373 | * bprintf service: | |
1374 | * vbin_printf() - VA arguments to binary data | |
1375 | * bstr_printf() - Binary data to text string | |
1376 | */ | |
1377 | ||
1378 | /** | |
1379 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1380 | * @bin_buf: The buffer to place args' binary value | |
1381 | * @size: The size of the buffer(by words(32bits), not characters) | |
1382 | * @fmt: The format string to use | |
1383 | * @args: Arguments for the format string | |
1384 | * | |
1385 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1386 | * is skiped. | |
1387 | * | |
1388 | * The return value is the number of words(32bits) which would be generated for | |
1389 | * the given input. | |
1390 | * | |
1391 | * NOTE: | |
1392 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1393 | * valid for bstr_printf(). | |
1394 | */ | |
1395 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1396 | { | |
fef20d9c | 1397 | struct printf_spec spec = {0}; |
4370aa4a | 1398 | char *str, *end; |
fef20d9c | 1399 | int read; |
4370aa4a LJ |
1400 | |
1401 | str = (char *)bin_buf; | |
1402 | end = (char *)(bin_buf + size); | |
1403 | ||
1404 | #define save_arg(type) \ | |
1405 | do { \ | |
1406 | if (sizeof(type) == 8) { \ | |
1407 | unsigned long long value; \ | |
1408 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1409 | value = va_arg(args, unsigned long long); \ | |
1410 | if (str + sizeof(type) <= end) { \ | |
1411 | *(u32 *)str = *(u32 *)&value; \ | |
1412 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1413 | } \ | |
1414 | } else { \ | |
1415 | unsigned long value; \ | |
1416 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1417 | value = va_arg(args, int); \ | |
1418 | if (str + sizeof(type) <= end) \ | |
1419 | *(typeof(type) *)str = (type)value; \ | |
1420 | } \ | |
1421 | str += sizeof(type); \ | |
1422 | } while (0) | |
1423 | ||
4370aa4a | 1424 | |
fef20d9c FW |
1425 | while (*fmt) { |
1426 | read = format_decode(fmt, &spec); | |
4370aa4a | 1427 | |
fef20d9c | 1428 | fmt += read; |
4370aa4a | 1429 | |
fef20d9c FW |
1430 | switch (spec.type) { |
1431 | case FORMAT_TYPE_NONE: | |
1432 | break; | |
1433 | ||
ed681a91 | 1434 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1435 | case FORMAT_TYPE_PRECISION: |
1436 | save_arg(int); | |
1437 | break; | |
1438 | ||
1439 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1440 | save_arg(char); |
fef20d9c FW |
1441 | break; |
1442 | ||
1443 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1444 | const char *save_str = va_arg(args, char *); |
1445 | size_t len; | |
1446 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE | |
1447 | || (unsigned long)save_str < PAGE_SIZE) | |
1448 | save_str = "<NULL>"; | |
1449 | len = strlen(save_str); | |
1450 | if (str + len + 1 < end) | |
1451 | memcpy(str, save_str, len + 1); | |
1452 | str += len + 1; | |
fef20d9c | 1453 | break; |
4370aa4a | 1454 | } |
fef20d9c FW |
1455 | |
1456 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1457 | save_arg(void *); |
1458 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1459 | while (isalnum(*fmt)) |
4370aa4a | 1460 | fmt++; |
fef20d9c FW |
1461 | break; |
1462 | ||
1463 | case FORMAT_TYPE_PERCENT_CHAR: | |
1464 | break; | |
1465 | ||
1466 | case FORMAT_TYPE_INVALID: | |
fef20d9c FW |
1467 | break; |
1468 | ||
1469 | case FORMAT_TYPE_NRCHARS: { | |
4370aa4a | 1470 | /* skip %n 's argument */ |
fef20d9c | 1471 | int qualifier = spec.qualifier; |
4370aa4a LJ |
1472 | void *skip_arg; |
1473 | if (qualifier == 'l') | |
1474 | skip_arg = va_arg(args, long *); | |
1475 | else if (qualifier == 'Z' || qualifier == 'z') | |
1476 | skip_arg = va_arg(args, size_t *); | |
1477 | else | |
1478 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1479 | break; |
4370aa4a | 1480 | } |
fef20d9c FW |
1481 | |
1482 | default: | |
1483 | switch (spec.type) { | |
1484 | ||
1485 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1486 | save_arg(long long); |
fef20d9c FW |
1487 | break; |
1488 | case FORMAT_TYPE_ULONG: | |
1489 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1490 | save_arg(unsigned long); |
fef20d9c FW |
1491 | break; |
1492 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1493 | save_arg(size_t); |
fef20d9c FW |
1494 | break; |
1495 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 1496 | save_arg(ptrdiff_t); |
fef20d9c | 1497 | break; |
a4e94ef0 Z |
1498 | case FORMAT_TYPE_UBYTE: |
1499 | case FORMAT_TYPE_BYTE: | |
1500 | save_arg(char); | |
1501 | break; | |
fef20d9c FW |
1502 | case FORMAT_TYPE_USHORT: |
1503 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 1504 | save_arg(short); |
fef20d9c FW |
1505 | break; |
1506 | default: | |
4370aa4a | 1507 | save_arg(int); |
fef20d9c | 1508 | } |
4370aa4a LJ |
1509 | } |
1510 | } | |
4370aa4a | 1511 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c FW |
1512 | |
1513 | #undef save_arg | |
4370aa4a LJ |
1514 | } |
1515 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1516 | ||
1517 | /** | |
1518 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1519 | * @buf: The buffer to place the result into | |
1520 | * @size: The size of the buffer, including the trailing null space | |
1521 | * @fmt: The format string to use | |
1522 | * @bin_buf: Binary arguments for the format string | |
1523 | * | |
1524 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1525 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1526 | * a binary buffer that generated by vbin_printf. | |
1527 | * | |
1528 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 1529 | * see vsnprintf comment for details. |
4370aa4a LJ |
1530 | * |
1531 | * The return value is the number of characters which would | |
1532 | * be generated for the given input, excluding the trailing | |
1533 | * '\0', as per ISO C99. If you want to have the exact | |
1534 | * number of characters written into @buf as return value | |
1535 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1536 | * return is greater than or equal to @size, the resulting | |
1537 | * string is truncated. | |
1538 | */ | |
1539 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1540 | { | |
1541 | unsigned long long num; | |
4370aa4a LJ |
1542 | char *str, *end, c; |
1543 | const char *args = (const char *)bin_buf; | |
1544 | ||
fef20d9c | 1545 | struct printf_spec spec = {0}; |
4370aa4a | 1546 | |
2f30b1f9 | 1547 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 1548 | return 0; |
4370aa4a LJ |
1549 | |
1550 | str = buf; | |
1551 | end = buf + size; | |
1552 | ||
1553 | #define get_arg(type) \ | |
1554 | ({ \ | |
1555 | typeof(type) value; \ | |
1556 | if (sizeof(type) == 8) { \ | |
1557 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1558 | *(u32 *)&value = *(u32 *)args; \ | |
1559 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1560 | } else { \ | |
1561 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1562 | value = *(typeof(type) *)args; \ | |
1563 | } \ | |
1564 | args += sizeof(type); \ | |
1565 | value; \ | |
1566 | }) | |
1567 | ||
1568 | /* Make sure end is always >= buf */ | |
1569 | if (end < buf) { | |
1570 | end = ((void *)-1); | |
1571 | size = end - buf; | |
1572 | } | |
1573 | ||
fef20d9c FW |
1574 | while (*fmt) { |
1575 | int read; | |
1576 | const char *old_fmt = fmt; | |
4370aa4a | 1577 | |
fef20d9c | 1578 | read = format_decode(fmt, &spec); |
4370aa4a | 1579 | |
fef20d9c | 1580 | fmt += read; |
4370aa4a | 1581 | |
fef20d9c FW |
1582 | switch (spec.type) { |
1583 | case FORMAT_TYPE_NONE: { | |
1584 | int copy = read; | |
1585 | if (str < end) { | |
1586 | if (copy > end - str) | |
1587 | copy = end - str; | |
1588 | memcpy(str, old_fmt, copy); | |
4370aa4a | 1589 | } |
fef20d9c FW |
1590 | str += read; |
1591 | break; | |
4370aa4a LJ |
1592 | } |
1593 | ||
ed681a91 | 1594 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1595 | spec.field_width = get_arg(int); |
1596 | break; | |
4370aa4a | 1597 | |
fef20d9c FW |
1598 | case FORMAT_TYPE_PRECISION: |
1599 | spec.precision = get_arg(int); | |
1600 | break; | |
4370aa4a | 1601 | |
fef20d9c FW |
1602 | case FORMAT_TYPE_CHAR: |
1603 | if (!(spec.flags & LEFT)) { | |
1604 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
1605 | if (str < end) |
1606 | *str = ' '; | |
1607 | ++str; | |
1608 | } | |
1609 | } | |
1610 | c = (unsigned char) get_arg(char); | |
1611 | if (str < end) | |
1612 | *str = c; | |
1613 | ++str; | |
fef20d9c | 1614 | while (--spec.field_width > 0) { |
4370aa4a LJ |
1615 | if (str < end) |
1616 | *str = ' '; | |
1617 | ++str; | |
1618 | } | |
fef20d9c | 1619 | break; |
4370aa4a | 1620 | |
fef20d9c | 1621 | case FORMAT_TYPE_STR: { |
4370aa4a LJ |
1622 | const char *str_arg = args; |
1623 | size_t len = strlen(str_arg); | |
1624 | args += len + 1; | |
fef20d9c FW |
1625 | str = string(str, end, (char *)str_arg, spec); |
1626 | break; | |
4370aa4a LJ |
1627 | } |
1628 | ||
fef20d9c FW |
1629 | case FORMAT_TYPE_PTR: |
1630 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1631 | while (isalnum(*fmt)) | |
4370aa4a | 1632 | fmt++; |
fef20d9c | 1633 | break; |
4370aa4a | 1634 | |
fef20d9c | 1635 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
1636 | if (str < end) |
1637 | *str = '%'; | |
1638 | ++str; | |
4370aa4a LJ |
1639 | break; |
1640 | ||
fef20d9c | 1641 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
1642 | if (str < end) |
1643 | *str = '%'; | |
1644 | ++str; | |
fef20d9c FW |
1645 | break; |
1646 | ||
1647 | case FORMAT_TYPE_NRCHARS: | |
1648 | /* skip */ | |
1649 | break; | |
1650 | ||
1651 | default: | |
1652 | switch (spec.type) { | |
1653 | ||
1654 | case FORMAT_TYPE_LONG_LONG: | |
1655 | num = get_arg(long long); | |
1656 | break; | |
1657 | case FORMAT_TYPE_ULONG: | |
1658 | num = get_arg(unsigned long); | |
1659 | break; | |
1660 | case FORMAT_TYPE_LONG: | |
1661 | num = get_arg(unsigned long); | |
1662 | break; | |
1663 | case FORMAT_TYPE_SIZE_T: | |
1664 | num = get_arg(size_t); | |
1665 | break; | |
1666 | case FORMAT_TYPE_PTRDIFF: | |
1667 | num = get_arg(ptrdiff_t); | |
1668 | break; | |
a4e94ef0 Z |
1669 | case FORMAT_TYPE_UBYTE: |
1670 | num = get_arg(unsigned char); | |
1671 | break; | |
1672 | case FORMAT_TYPE_BYTE: | |
1673 | num = get_arg(signed char); | |
1674 | break; | |
fef20d9c FW |
1675 | case FORMAT_TYPE_USHORT: |
1676 | num = get_arg(unsigned short); | |
1677 | break; | |
1678 | case FORMAT_TYPE_SHORT: | |
1679 | num = get_arg(short); | |
1680 | break; | |
1681 | case FORMAT_TYPE_UINT: | |
1682 | num = get_arg(unsigned int); | |
1683 | break; | |
1684 | default: | |
1685 | num = get_arg(int); | |
1686 | } | |
1687 | ||
1688 | str = number(str, end, num, spec); | |
4370aa4a | 1689 | } |
4370aa4a | 1690 | } |
fef20d9c | 1691 | |
4370aa4a LJ |
1692 | if (size > 0) { |
1693 | if (str < end) | |
1694 | *str = '\0'; | |
1695 | else | |
1696 | end[-1] = '\0'; | |
1697 | } | |
fef20d9c | 1698 | |
4370aa4a LJ |
1699 | #undef get_arg |
1700 | ||
1701 | /* the trailing null byte doesn't count towards the total */ | |
1702 | return str - buf; | |
1703 | } | |
1704 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1705 | ||
1706 | /** | |
1707 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1708 | * @bin_buf: The buffer to place args' binary value | |
1709 | * @size: The size of the buffer(by words(32bits), not characters) | |
1710 | * @fmt: The format string to use | |
1711 | * @...: Arguments for the format string | |
1712 | * | |
1713 | * The function returns the number of words(u32) written | |
1714 | * into @bin_buf. | |
1715 | */ | |
1716 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1717 | { | |
1718 | va_list args; | |
1719 | int ret; | |
1720 | ||
1721 | va_start(args, fmt); | |
1722 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1723 | va_end(args); | |
1724 | return ret; | |
1725 | } | |
1726 | EXPORT_SYMBOL_GPL(bprintf); | |
1727 | ||
1728 | #endif /* CONFIG_BINARY_PRINTF */ | |
1729 | ||
1da177e4 LT |
1730 | /** |
1731 | * vsscanf - Unformat a buffer into a list of arguments | |
1732 | * @buf: input buffer | |
1733 | * @fmt: format of buffer | |
1734 | * @args: arguments | |
1735 | */ | |
1736 | int vsscanf(const char * buf, const char * fmt, va_list args) | |
1737 | { | |
1738 | const char *str = buf; | |
1739 | char *next; | |
1740 | char digit; | |
1741 | int num = 0; | |
1742 | int qualifier; | |
1743 | int base; | |
1744 | int field_width; | |
1745 | int is_sign = 0; | |
1746 | ||
1747 | while(*fmt && *str) { | |
1748 | /* skip any white space in format */ | |
1749 | /* white space in format matchs any amount of | |
1750 | * white space, including none, in the input. | |
1751 | */ | |
1752 | if (isspace(*fmt)) { | |
1753 | while (isspace(*fmt)) | |
1754 | ++fmt; | |
1755 | while (isspace(*str)) | |
1756 | ++str; | |
1757 | } | |
1758 | ||
1759 | /* anything that is not a conversion must match exactly */ | |
1760 | if (*fmt != '%' && *fmt) { | |
1761 | if (*fmt++ != *str++) | |
1762 | break; | |
1763 | continue; | |
1764 | } | |
1765 | ||
1766 | if (!*fmt) | |
1767 | break; | |
1768 | ++fmt; | |
1769 | ||
1770 | /* skip this conversion. | |
1771 | * advance both strings to next white space | |
1772 | */ | |
1773 | if (*fmt == '*') { | |
8fccae2c | 1774 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
1775 | fmt++; |
1776 | while (!isspace(*str) && *str) | |
1777 | str++; | |
1778 | continue; | |
1779 | } | |
1780 | ||
1781 | /* get field width */ | |
1782 | field_width = -1; | |
1783 | if (isdigit(*fmt)) | |
1784 | field_width = skip_atoi(&fmt); | |
1785 | ||
1786 | /* get conversion qualifier */ | |
1787 | qualifier = -1; | |
1788 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
1789 | *fmt == 'Z' || *fmt == 'z') { | |
1790 | qualifier = *fmt++; | |
1791 | if (unlikely(qualifier == *fmt)) { | |
1792 | if (qualifier == 'h') { | |
1793 | qualifier = 'H'; | |
1794 | fmt++; | |
1795 | } else if (qualifier == 'l') { | |
1796 | qualifier = 'L'; | |
1797 | fmt++; | |
1798 | } | |
1799 | } | |
1800 | } | |
1801 | base = 10; | |
1802 | is_sign = 0; | |
1803 | ||
1804 | if (!*fmt || !*str) | |
1805 | break; | |
1806 | ||
1807 | switch(*fmt++) { | |
1808 | case 'c': | |
1809 | { | |
1810 | char *s = (char *) va_arg(args,char*); | |
1811 | if (field_width == -1) | |
1812 | field_width = 1; | |
1813 | do { | |
1814 | *s++ = *str++; | |
1815 | } while (--field_width > 0 && *str); | |
1816 | num++; | |
1817 | } | |
1818 | continue; | |
1819 | case 's': | |
1820 | { | |
1821 | char *s = (char *) va_arg(args, char *); | |
1822 | if(field_width == -1) | |
1823 | field_width = INT_MAX; | |
1824 | /* first, skip leading white space in buffer */ | |
1825 | while (isspace(*str)) | |
1826 | str++; | |
1827 | ||
1828 | /* now copy until next white space */ | |
1829 | while (*str && !isspace(*str) && field_width--) { | |
1830 | *s++ = *str++; | |
1831 | } | |
1832 | *s = '\0'; | |
1833 | num++; | |
1834 | } | |
1835 | continue; | |
1836 | case 'n': | |
1837 | /* return number of characters read so far */ | |
1838 | { | |
1839 | int *i = (int *)va_arg(args,int*); | |
1840 | *i = str - buf; | |
1841 | } | |
1842 | continue; | |
1843 | case 'o': | |
1844 | base = 8; | |
1845 | break; | |
1846 | case 'x': | |
1847 | case 'X': | |
1848 | base = 16; | |
1849 | break; | |
1850 | case 'i': | |
1851 | base = 0; | |
1852 | case 'd': | |
1853 | is_sign = 1; | |
1854 | case 'u': | |
1855 | break; | |
1856 | case '%': | |
1857 | /* looking for '%' in str */ | |
1858 | if (*str++ != '%') | |
1859 | return num; | |
1860 | continue; | |
1861 | default: | |
1862 | /* invalid format; stop here */ | |
1863 | return num; | |
1864 | } | |
1865 | ||
1866 | /* have some sort of integer conversion. | |
1867 | * first, skip white space in buffer. | |
1868 | */ | |
1869 | while (isspace(*str)) | |
1870 | str++; | |
1871 | ||
1872 | digit = *str; | |
1873 | if (is_sign && digit == '-') | |
1874 | digit = *(str + 1); | |
1875 | ||
1876 | if (!digit | |
1877 | || (base == 16 && !isxdigit(digit)) | |
1878 | || (base == 10 && !isdigit(digit)) | |
1879 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1880 | || (base == 0 && !isdigit(digit))) | |
1881 | break; | |
1882 | ||
1883 | switch(qualifier) { | |
1884 | case 'H': /* that's 'hh' in format */ | |
1885 | if (is_sign) { | |
1886 | signed char *s = (signed char *) va_arg(args,signed char *); | |
1887 | *s = (signed char) simple_strtol(str,&next,base); | |
1888 | } else { | |
1889 | unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); | |
1890 | *s = (unsigned char) simple_strtoul(str, &next, base); | |
1891 | } | |
1892 | break; | |
1893 | case 'h': | |
1894 | if (is_sign) { | |
1895 | short *s = (short *) va_arg(args,short *); | |
1896 | *s = (short) simple_strtol(str,&next,base); | |
1897 | } else { | |
1898 | unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); | |
1899 | *s = (unsigned short) simple_strtoul(str, &next, base); | |
1900 | } | |
1901 | break; | |
1902 | case 'l': | |
1903 | if (is_sign) { | |
1904 | long *l = (long *) va_arg(args,long *); | |
1905 | *l = simple_strtol(str,&next,base); | |
1906 | } else { | |
1907 | unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); | |
1908 | *l = simple_strtoul(str,&next,base); | |
1909 | } | |
1910 | break; | |
1911 | case 'L': | |
1912 | if (is_sign) { | |
1913 | long long *l = (long long*) va_arg(args,long long *); | |
1914 | *l = simple_strtoll(str,&next,base); | |
1915 | } else { | |
1916 | unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); | |
1917 | *l = simple_strtoull(str,&next,base); | |
1918 | } | |
1919 | break; | |
1920 | case 'Z': | |
1921 | case 'z': | |
1922 | { | |
1923 | size_t *s = (size_t*) va_arg(args,size_t*); | |
1924 | *s = (size_t) simple_strtoul(str,&next,base); | |
1925 | } | |
1926 | break; | |
1927 | default: | |
1928 | if (is_sign) { | |
1929 | int *i = (int *) va_arg(args, int*); | |
1930 | *i = (int) simple_strtol(str,&next,base); | |
1931 | } else { | |
1932 | unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); | |
1933 | *i = (unsigned int) simple_strtoul(str,&next,base); | |
1934 | } | |
1935 | break; | |
1936 | } | |
1937 | num++; | |
1938 | ||
1939 | if (!next) | |
1940 | break; | |
1941 | str = next; | |
1942 | } | |
c6b40d16 JB |
1943 | |
1944 | /* | |
1945 | * Now we've come all the way through so either the input string or the | |
1946 | * format ended. In the former case, there can be a %n at the current | |
1947 | * position in the format that needs to be filled. | |
1948 | */ | |
1949 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
1950 | int *p = (int *)va_arg(args, int *); | |
1951 | *p = str - buf; | |
1952 | } | |
1953 | ||
1da177e4 LT |
1954 | return num; |
1955 | } | |
1da177e4 LT |
1956 | EXPORT_SYMBOL(vsscanf); |
1957 | ||
1958 | /** | |
1959 | * sscanf - Unformat a buffer into a list of arguments | |
1960 | * @buf: input buffer | |
1961 | * @fmt: formatting of buffer | |
1962 | * @...: resulting arguments | |
1963 | */ | |
1964 | int sscanf(const char * buf, const char * fmt, ...) | |
1965 | { | |
1966 | va_list args; | |
1967 | int i; | |
1968 | ||
1969 | va_start(args,fmt); | |
1970 | i = vsscanf(buf,fmt,args); | |
1971 | va_end(args); | |
1972 | return i; | |
1973 | } | |
1da177e4 | 1974 | EXPORT_SYMBOL(sscanf); |