Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
7b9186f5 | 12 | /* |
1da177e4 LT |
13 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
14 | * - changed to provide snprintf and vsnprintf functions | |
15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
16 | * - scnprintf and vscnprintf | |
17 | */ | |
18 | ||
19 | #include <stdarg.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
0fe1ef24 LT |
25 | #include <linux/kallsyms.h> |
26 | #include <linux/uaccess.h> | |
332d2e78 | 27 | #include <linux/ioport.h> |
8a27f7c9 | 28 | #include <net/addrconf.h> |
1da177e4 | 29 | |
4e57b681 | 30 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 | 31 | #include <asm/div64.h> |
deac93df | 32 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 33 | |
9b706aee DV |
34 | /* Works only for digits and letters, but small and fast */ |
35 | #define TOLOWER(x) ((x) | 0x20) | |
36 | ||
aa46a63e HH |
37 | static unsigned int simple_guess_base(const char *cp) |
38 | { | |
39 | if (cp[0] == '0') { | |
40 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) | |
41 | return 16; | |
42 | else | |
43 | return 8; | |
44 | } else { | |
45 | return 10; | |
46 | } | |
47 | } | |
48 | ||
1da177e4 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 | } | |
74 | if (endp) | |
75 | *endp = (char *)cp; | |
7b9186f5 | 76 | |
1da177e4 LT |
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 | { |
7b9186f5 | 89 | if (*cp == '-') |
22d27051 | 90 | return -simple_strtoul(cp + 1, endp, base); |
7b9186f5 | 91 | |
22d27051 | 92 | return simple_strtoul(cp, endp, base); |
1da177e4 | 93 | } |
1da177e4 LT |
94 | EXPORT_SYMBOL(simple_strtol); |
95 | ||
96 | /** | |
97 | * simple_strtoull - convert a string to an unsigned long long | |
98 | * @cp: The start of the string | |
99 | * @endp: A pointer to the end of the parsed string will be placed here | |
100 | * @base: The number base to use | |
101 | */ | |
22d27051 | 102 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 103 | { |
aa46a63e HH |
104 | unsigned long long result = 0; |
105 | ||
106 | if (!base) | |
107 | base = simple_guess_base(cp); | |
108 | ||
109 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') | |
110 | cp += 2; | |
111 | ||
112 | while (isxdigit(*cp)) { | |
113 | unsigned int value; | |
114 | ||
115 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
116 | if (value >= base) | |
117 | break; | |
118 | result = result * base + value; | |
1da177e4 LT |
119 | cp++; |
120 | } | |
121 | if (endp) | |
122 | *endp = (char *)cp; | |
7b9186f5 | 123 | |
1da177e4 LT |
124 | return result; |
125 | } | |
1da177e4 LT |
126 | EXPORT_SYMBOL(simple_strtoull); |
127 | ||
128 | /** | |
129 | * simple_strtoll - convert a string to a signed long long | |
130 | * @cp: The start of the string | |
131 | * @endp: A pointer to the end of the parsed string will be placed here | |
132 | * @base: The number base to use | |
133 | */ | |
22d27051 | 134 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 135 | { |
7b9186f5 | 136 | if (*cp == '-') |
22d27051 | 137 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 138 | |
22d27051 | 139 | return simple_strtoull(cp, endp, base); |
1da177e4 LT |
140 | } |
141 | ||
06b2a76d YY |
142 | /** |
143 | * strict_strtoul - convert a string to an unsigned long strictly | |
144 | * @cp: The string to be converted | |
145 | * @base: The number base to use | |
146 | * @res: The converted result value | |
147 | * | |
148 | * strict_strtoul converts a string to an unsigned long only if the | |
149 | * string is really an unsigned long string, any string containing | |
150 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
151 | * only a newline char at the tail is acceptible because people generally | |
152 | * change a module parameter in the following way: | |
153 | * | |
154 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
155 | * | |
156 | * echo will append a newline to the tail. | |
157 | * | |
158 | * It returns 0 if conversion is successful and *res is set to the converted | |
159 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
160 | * | |
161 | * simple_strtoul just ignores the successive invalid characters and | |
162 | * return the converted value of prefix part of the string. | |
163 | */ | |
9d85db22 HH |
164 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) |
165 | { | |
166 | char *tail; | |
167 | unsigned long val; | |
168 | size_t len; | |
169 | ||
170 | *res = 0; | |
171 | len = strlen(cp); | |
172 | if (len == 0) | |
173 | return -EINVAL; | |
174 | ||
175 | val = simple_strtoul(cp, &tail, base); | |
e899aa82 PM |
176 | if (tail == cp) |
177 | return -EINVAL; | |
7b9186f5 | 178 | |
9d85db22 HH |
179 | if ((*tail == '\0') || |
180 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
181 | *res = val; | |
182 | return 0; | |
183 | } | |
184 | ||
185 | return -EINVAL; | |
186 | } | |
187 | EXPORT_SYMBOL(strict_strtoul); | |
06b2a76d YY |
188 | |
189 | /** | |
190 | * strict_strtol - convert a string to a long strictly | |
191 | * @cp: The string to be converted | |
192 | * @base: The number base to use | |
193 | * @res: The converted result value | |
194 | * | |
195 | * strict_strtol is similiar to strict_strtoul, but it allows the first | |
196 | * character of a string is '-'. | |
197 | * | |
198 | * It returns 0 if conversion is successful and *res is set to the converted | |
199 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
200 | */ | |
9d85db22 HH |
201 | int strict_strtol(const char *cp, unsigned int base, long *res) |
202 | { | |
203 | int ret; | |
204 | if (*cp == '-') { | |
205 | ret = strict_strtoul(cp + 1, base, (unsigned long *)res); | |
206 | if (!ret) | |
207 | *res = -(*res); | |
208 | } else { | |
209 | ret = strict_strtoul(cp, base, (unsigned long *)res); | |
210 | } | |
211 | ||
212 | return ret; | |
213 | } | |
214 | EXPORT_SYMBOL(strict_strtol); | |
06b2a76d YY |
215 | |
216 | /** | |
217 | * strict_strtoull - convert a string to an unsigned long long strictly | |
218 | * @cp: The string to be converted | |
219 | * @base: The number base to use | |
220 | * @res: The converted result value | |
221 | * | |
222 | * strict_strtoull converts a string to an unsigned long long only if the | |
223 | * string is really an unsigned long long string, any string containing | |
224 | * any invalid char at the tail will be rejected and -EINVAL is returned, | |
225 | * only a newline char at the tail is acceptible because people generally | |
226 | * change a module parameter in the following way: | |
227 | * | |
228 | * echo 1024 > /sys/module/e1000/parameters/copybreak | |
229 | * | |
230 | * echo will append a newline to the tail of the string. | |
231 | * | |
232 | * It returns 0 if conversion is successful and *res is set to the converted | |
233 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
234 | * | |
235 | * simple_strtoull just ignores the successive invalid characters and | |
236 | * return the converted value of prefix part of the string. | |
237 | */ | |
9d85db22 HH |
238 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) |
239 | { | |
240 | char *tail; | |
241 | unsigned long long val; | |
242 | size_t len; | |
243 | ||
244 | *res = 0; | |
245 | len = strlen(cp); | |
246 | if (len == 0) | |
247 | return -EINVAL; | |
248 | ||
249 | val = simple_strtoull(cp, &tail, base); | |
e899aa82 PM |
250 | if (tail == cp) |
251 | return -EINVAL; | |
9d85db22 HH |
252 | if ((*tail == '\0') || |
253 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { | |
254 | *res = val; | |
255 | return 0; | |
256 | } | |
257 | ||
258 | return -EINVAL; | |
259 | } | |
260 | EXPORT_SYMBOL(strict_strtoull); | |
06b2a76d YY |
261 | |
262 | /** | |
263 | * strict_strtoll - convert a string to a long long strictly | |
264 | * @cp: The string to be converted | |
265 | * @base: The number base to use | |
266 | * @res: The converted result value | |
267 | * | |
268 | * strict_strtoll is similiar to strict_strtoull, but it allows the first | |
269 | * character of a string is '-'. | |
270 | * | |
271 | * It returns 0 if conversion is successful and *res is set to the converted | |
272 | * value, otherwise it returns -EINVAL and *res is set to 0. | |
273 | */ | |
9d85db22 HH |
274 | int strict_strtoll(const char *cp, unsigned int base, long long *res) |
275 | { | |
276 | int ret; | |
277 | if (*cp == '-') { | |
278 | ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); | |
279 | if (!ret) | |
280 | *res = -(*res); | |
281 | } else { | |
282 | ret = strict_strtoull(cp, base, (unsigned long long *)res); | |
283 | } | |
06b2a76d | 284 | |
9d85db22 HH |
285 | return ret; |
286 | } | |
06b2a76d | 287 | EXPORT_SYMBOL(strict_strtoll); |
06b2a76d | 288 | |
1da177e4 LT |
289 | static int skip_atoi(const char **s) |
290 | { | |
7b9186f5 | 291 | int i = 0; |
1da177e4 LT |
292 | |
293 | while (isdigit(**s)) | |
294 | i = i*10 + *((*s)++) - '0'; | |
7b9186f5 | 295 | |
1da177e4 LT |
296 | return i; |
297 | } | |
298 | ||
4277eedd DV |
299 | /* Decimal conversion is by far the most typical, and is used |
300 | * for /proc and /sys data. This directly impacts e.g. top performance | |
301 | * with many processes running. We optimize it for speed | |
302 | * using code from | |
303 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
304 | * (with permission from the author, Douglas W. Jones). */ | |
305 | ||
306 | /* Formats correctly any integer in [0,99999]. | |
307 | * Outputs from one to five digits depending on input. | |
308 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
7b9186f5 | 309 | static char *put_dec_trunc(char *buf, unsigned q) |
4277eedd DV |
310 | { |
311 | unsigned d3, d2, d1, d0; | |
312 | d1 = (q>>4) & 0xf; | |
313 | d2 = (q>>8) & 0xf; | |
314 | d3 = (q>>12); | |
315 | ||
316 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
317 | q = (d0 * 0xcd) >> 11; | |
318 | d0 = d0 - 10*q; | |
319 | *buf++ = d0 + '0'; /* least significant digit */ | |
320 | d1 = q + 9*d3 + 5*d2 + d1; | |
321 | if (d1 != 0) { | |
322 | q = (d1 * 0xcd) >> 11; | |
323 | d1 = d1 - 10*q; | |
324 | *buf++ = d1 + '0'; /* next digit */ | |
325 | ||
326 | d2 = q + 2*d2; | |
327 | if ((d2 != 0) || (d3 != 0)) { | |
328 | q = (d2 * 0xd) >> 7; | |
329 | d2 = d2 - 10*q; | |
330 | *buf++ = d2 + '0'; /* next digit */ | |
331 | ||
332 | d3 = q + 4*d3; | |
333 | if (d3 != 0) { | |
334 | q = (d3 * 0xcd) >> 11; | |
335 | d3 = d3 - 10*q; | |
336 | *buf++ = d3 + '0'; /* next digit */ | |
337 | if (q != 0) | |
7b9186f5 | 338 | *buf++ = q + '0'; /* most sign. digit */ |
4277eedd DV |
339 | } |
340 | } | |
341 | } | |
7b9186f5 | 342 | |
4277eedd DV |
343 | return buf; |
344 | } | |
345 | /* Same with if's removed. Always emits five digits */ | |
7b9186f5 | 346 | static char *put_dec_full(char *buf, unsigned q) |
4277eedd DV |
347 | { |
348 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
349 | /* but anyway, gcc produces better code with full-sized ints */ | |
350 | unsigned d3, d2, d1, d0; | |
351 | d1 = (q>>4) & 0xf; | |
352 | d2 = (q>>8) & 0xf; | |
353 | d3 = (q>>12); | |
354 | ||
7b9186f5 AGR |
355 | /* |
356 | * Possible ways to approx. divide by 10 | |
357 | * gcc -O2 replaces multiply with shifts and adds | |
358 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
359 | * (x * 0x67) >> 10: 1100111 | |
360 | * (x * 0x34) >> 9: 110100 - same | |
361 | * (x * 0x1a) >> 8: 11010 - same | |
362 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
363 | */ | |
4277eedd DV |
364 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
365 | q = (d0 * 0xcd) >> 11; | |
366 | d0 = d0 - 10*q; | |
367 | *buf++ = d0 + '0'; | |
368 | d1 = q + 9*d3 + 5*d2 + d1; | |
369 | q = (d1 * 0xcd) >> 11; | |
370 | d1 = d1 - 10*q; | |
371 | *buf++ = d1 + '0'; | |
372 | ||
373 | d2 = q + 2*d2; | |
374 | q = (d2 * 0xd) >> 7; | |
375 | d2 = d2 - 10*q; | |
376 | *buf++ = d2 + '0'; | |
377 | ||
378 | d3 = q + 4*d3; | |
379 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
380 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
381 | d3 = d3 - 10*q; | |
382 | *buf++ = d3 + '0'; | |
383 | *buf++ = q + '0'; | |
7b9186f5 | 384 | |
4277eedd DV |
385 | return buf; |
386 | } | |
387 | /* No inlining helps gcc to use registers better */ | |
7b9186f5 | 388 | static noinline char *put_dec(char *buf, unsigned long long num) |
4277eedd DV |
389 | { |
390 | while (1) { | |
391 | unsigned rem; | |
392 | if (num < 100000) | |
393 | return put_dec_trunc(buf, num); | |
394 | rem = do_div(num, 100000); | |
395 | buf = put_dec_full(buf, rem); | |
396 | } | |
397 | } | |
398 | ||
1da177e4 LT |
399 | #define ZEROPAD 1 /* pad with zero */ |
400 | #define SIGN 2 /* unsigned/signed long */ | |
401 | #define PLUS 4 /* show plus */ | |
402 | #define SPACE 8 /* space if plus */ | |
403 | #define LEFT 16 /* left justified */ | |
9b706aee DV |
404 | #define SMALL 32 /* Must be 32 == 0x20 */ |
405 | #define SPECIAL 64 /* 0x */ | |
1da177e4 | 406 | |
fef20d9c FW |
407 | enum format_type { |
408 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 409 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
410 | FORMAT_TYPE_PRECISION, |
411 | FORMAT_TYPE_CHAR, | |
412 | FORMAT_TYPE_STR, | |
413 | FORMAT_TYPE_PTR, | |
414 | FORMAT_TYPE_PERCENT_CHAR, | |
415 | FORMAT_TYPE_INVALID, | |
416 | FORMAT_TYPE_LONG_LONG, | |
417 | FORMAT_TYPE_ULONG, | |
418 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
419 | FORMAT_TYPE_UBYTE, |
420 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
421 | FORMAT_TYPE_USHORT, |
422 | FORMAT_TYPE_SHORT, | |
423 | FORMAT_TYPE_UINT, | |
424 | FORMAT_TYPE_INT, | |
425 | FORMAT_TYPE_NRCHARS, | |
426 | FORMAT_TYPE_SIZE_T, | |
427 | FORMAT_TYPE_PTRDIFF | |
428 | }; | |
429 | ||
430 | struct printf_spec { | |
431 | enum format_type type; | |
432 | int flags; /* flags to number() */ | |
433 | int field_width; /* width of output field */ | |
434 | int base; | |
435 | int precision; /* # of digits/chars */ | |
436 | int qualifier; | |
437 | }; | |
438 | ||
439 | static char *number(char *buf, char *end, unsigned long long num, | |
440 | struct printf_spec spec) | |
1da177e4 | 441 | { |
9b706aee DV |
442 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
443 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
444 | ||
445 | char tmp[66]; | |
446 | char sign; | |
447 | char locase; | |
fef20d9c | 448 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 LT |
449 | int i; |
450 | ||
9b706aee DV |
451 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
452 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
453 | locase = (spec.flags & SMALL); |
454 | if (spec.flags & LEFT) | |
455 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 456 | sign = 0; |
fef20d9c | 457 | if (spec.flags & SIGN) { |
7b9186f5 | 458 | if ((signed long long)num < 0) { |
1da177e4 | 459 | sign = '-'; |
7b9186f5 | 460 | num = -(signed long long)num; |
fef20d9c FW |
461 | spec.field_width--; |
462 | } else if (spec.flags & PLUS) { | |
1da177e4 | 463 | sign = '+'; |
fef20d9c FW |
464 | spec.field_width--; |
465 | } else if (spec.flags & SPACE) { | |
1da177e4 | 466 | sign = ' '; |
fef20d9c | 467 | spec.field_width--; |
1da177e4 LT |
468 | } |
469 | } | |
b39a7340 | 470 | if (need_pfx) { |
fef20d9c FW |
471 | spec.field_width--; |
472 | if (spec.base == 16) | |
473 | spec.field_width--; | |
1da177e4 | 474 | } |
b39a7340 DV |
475 | |
476 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
477 | i = 0; |
478 | if (num == 0) | |
b39a7340 | 479 | tmp[i++] = '0'; |
4277eedd DV |
480 | /* Generic code, for any base: |
481 | else do { | |
9b706aee | 482 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
483 | } while (num != 0); |
484 | */ | |
fef20d9c FW |
485 | else if (spec.base != 10) { /* 8 or 16 */ |
486 | int mask = spec.base - 1; | |
b39a7340 | 487 | int shift = 3; |
7b9186f5 AGR |
488 | |
489 | if (spec.base == 16) | |
490 | shift = 4; | |
b39a7340 | 491 | do { |
9b706aee | 492 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
493 | num >>= shift; |
494 | } while (num); | |
4277eedd DV |
495 | } else { /* base 10 */ |
496 | i = put_dec(tmp, num) - tmp; | |
497 | } | |
b39a7340 DV |
498 | |
499 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
500 | if (i > spec.precision) |
501 | spec.precision = i; | |
b39a7340 | 502 | /* leading space padding */ |
fef20d9c FW |
503 | spec.field_width -= spec.precision; |
504 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
7b9186f5 | 505 | while (--spec.field_width >= 0) { |
f796937a | 506 | if (buf < end) |
1da177e4 LT |
507 | *buf = ' '; |
508 | ++buf; | |
509 | } | |
510 | } | |
b39a7340 | 511 | /* sign */ |
1da177e4 | 512 | if (sign) { |
f796937a | 513 | if (buf < end) |
1da177e4 LT |
514 | *buf = sign; |
515 | ++buf; | |
516 | } | |
b39a7340 DV |
517 | /* "0x" / "0" prefix */ |
518 | if (need_pfx) { | |
519 | if (buf < end) | |
520 | *buf = '0'; | |
521 | ++buf; | |
fef20d9c | 522 | if (spec.base == 16) { |
f796937a | 523 | if (buf < end) |
9b706aee | 524 | *buf = ('X' | locase); |
1da177e4 LT |
525 | ++buf; |
526 | } | |
527 | } | |
b39a7340 | 528 | /* zero or space padding */ |
fef20d9c FW |
529 | if (!(spec.flags & LEFT)) { |
530 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
531 | while (--spec.field_width >= 0) { | |
f796937a | 532 | if (buf < end) |
1da177e4 LT |
533 | *buf = c; |
534 | ++buf; | |
535 | } | |
536 | } | |
b39a7340 | 537 | /* hmm even more zero padding? */ |
fef20d9c | 538 | while (i <= --spec.precision) { |
f796937a | 539 | if (buf < end) |
1da177e4 LT |
540 | *buf = '0'; |
541 | ++buf; | |
542 | } | |
b39a7340 DV |
543 | /* actual digits of result */ |
544 | while (--i >= 0) { | |
f796937a | 545 | if (buf < end) |
1da177e4 LT |
546 | *buf = tmp[i]; |
547 | ++buf; | |
548 | } | |
b39a7340 | 549 | /* trailing space padding */ |
fef20d9c | 550 | while (--spec.field_width >= 0) { |
f796937a | 551 | if (buf < end) |
1da177e4 LT |
552 | *buf = ' '; |
553 | ++buf; | |
554 | } | |
7b9186f5 | 555 | |
1da177e4 LT |
556 | return buf; |
557 | } | |
558 | ||
0f4f81dc | 559 | static char *string(char *buf, char *end, const char *s, struct printf_spec spec) |
0f9bfa56 LT |
560 | { |
561 | int len, i; | |
562 | ||
563 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 564 | s = "(null)"; |
0f9bfa56 | 565 | |
fef20d9c | 566 | len = strnlen(s, spec.precision); |
0f9bfa56 | 567 | |
fef20d9c FW |
568 | if (!(spec.flags & LEFT)) { |
569 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
570 | if (buf < end) |
571 | *buf = ' '; | |
572 | ++buf; | |
573 | } | |
574 | } | |
575 | for (i = 0; i < len; ++i) { | |
576 | if (buf < end) | |
577 | *buf = *s; | |
578 | ++buf; ++s; | |
579 | } | |
fef20d9c | 580 | while (len < spec.field_width--) { |
0f9bfa56 LT |
581 | if (buf < end) |
582 | *buf = ' '; | |
583 | ++buf; | |
584 | } | |
7b9186f5 | 585 | |
0f9bfa56 LT |
586 | return buf; |
587 | } | |
588 | ||
fef20d9c | 589 | static char *symbol_string(char *buf, char *end, void *ptr, |
0c8b946e | 590 | struct printf_spec spec, char ext) |
0fe1ef24 LT |
591 | { |
592 | unsigned long value = (unsigned long) ptr; | |
593 | #ifdef CONFIG_KALLSYMS | |
594 | char sym[KSYM_SYMBOL_LEN]; | |
91adcd2c | 595 | if (ext != 'f' && ext != 's') |
0c8b946e FW |
596 | sprint_symbol(sym, value); |
597 | else | |
598 | kallsyms_lookup(value, NULL, NULL, NULL, sym); | |
7b9186f5 | 599 | |
fef20d9c | 600 | return string(buf, end, sym, spec); |
0fe1ef24 | 601 | #else |
7b9186f5 | 602 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
603 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
604 | spec.base = 16; | |
7b9186f5 | 605 | |
fef20d9c | 606 | return number(buf, end, value, spec); |
0fe1ef24 LT |
607 | #endif |
608 | } | |
609 | ||
fef20d9c | 610 | static char *resource_string(char *buf, char *end, struct resource *res, |
fd95541e | 611 | struct printf_spec spec, const char *fmt) |
332d2e78 LT |
612 | { |
613 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 614 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
615 | #endif |
616 | ||
617 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 618 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 619 | #endif |
c91d3376 | 620 | struct printf_spec hex_spec = { |
fef20d9c FW |
621 | .base = 16, |
622 | .precision = -1, | |
623 | .flags = SPECIAL | SMALL | ZEROPAD, | |
624 | }; | |
c91d3376 BH |
625 | struct printf_spec dec_spec = { |
626 | .base = 10, | |
627 | .precision = -1, | |
628 | .flags = 0, | |
629 | }; | |
fd95541e BH |
630 | struct printf_spec str_spec = { |
631 | .field_width = -1, | |
632 | .precision = 10, | |
633 | .flags = LEFT, | |
634 | }; | |
635 | struct printf_spec flag_spec = { | |
636 | .base = 16, | |
637 | .precision = -1, | |
638 | .flags = SPECIAL | SMALL, | |
639 | }; | |
c7dabef8 BH |
640 | |
641 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
642 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
643 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
644 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
645 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref disabled]") | |
646 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") | |
647 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
648 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
649 | ||
332d2e78 | 650 | char *p = sym, *pend = sym + sizeof(sym); |
c91d3376 | 651 | int size = -1, addr = 0; |
c7dabef8 | 652 | int decode = (fmt[0] == 'R') ? 1 : 0; |
332d2e78 | 653 | |
c91d3376 | 654 | if (res->flags & IORESOURCE_IO) { |
332d2e78 | 655 | size = IO_RSRC_PRINTK_SIZE; |
c91d3376 BH |
656 | addr = 1; |
657 | } else if (res->flags & IORESOURCE_MEM) { | |
332d2e78 | 658 | size = MEM_RSRC_PRINTK_SIZE; |
c91d3376 BH |
659 | addr = 1; |
660 | } | |
332d2e78 LT |
661 | |
662 | *p++ = '['; | |
c7dabef8 BH |
663 | if (res->flags & IORESOURCE_IO) |
664 | p = string(p, pend, "io ", str_spec); | |
665 | else if (res->flags & IORESOURCE_MEM) | |
666 | p = string(p, pend, "mem ", str_spec); | |
667 | else if (res->flags & IORESOURCE_IRQ) | |
668 | p = string(p, pend, "irq ", str_spec); | |
669 | else if (res->flags & IORESOURCE_DMA) | |
670 | p = string(p, pend, "dma ", str_spec); | |
671 | else { | |
672 | p = string(p, pend, "??? ", str_spec); | |
673 | decode = 0; | |
fd95541e | 674 | } |
c91d3376 BH |
675 | hex_spec.field_width = size; |
676 | p = number(p, pend, res->start, addr ? hex_spec : dec_spec); | |
677 | if (res->start != res->end) { | |
678 | *p++ = '-'; | |
679 | p = number(p, pend, res->end, addr ? hex_spec : dec_spec); | |
680 | } | |
c7dabef8 | 681 | if (decode) { |
fd95541e BH |
682 | if (res->flags & IORESOURCE_MEM_64) |
683 | p = string(p, pend, " 64bit", str_spec); | |
684 | if (res->flags & IORESOURCE_PREFETCH) | |
685 | p = string(p, pend, " pref", str_spec); | |
686 | if (res->flags & IORESOURCE_DISABLED) | |
687 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
688 | } else { |
689 | p = string(p, pend, " flags ", str_spec); | |
690 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 691 | } |
332d2e78 | 692 | *p++ = ']'; |
c7dabef8 | 693 | *p = '\0'; |
332d2e78 | 694 | |
fef20d9c | 695 | return string(buf, end, sym, spec); |
332d2e78 LT |
696 | } |
697 | ||
fef20d9c | 698 | static char *mac_address_string(char *buf, char *end, u8 *addr, |
8a27f7c9 | 699 | struct printf_spec spec, const char *fmt) |
dd45c9cf | 700 | { |
8a27f7c9 | 701 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
702 | char *p = mac_addr; |
703 | int i; | |
704 | ||
705 | for (i = 0; i < 6; i++) { | |
706 | p = pack_hex_byte(p, addr[i]); | |
8a27f7c9 | 707 | if (fmt[0] == 'M' && i != 5) |
dd45c9cf HH |
708 | *p++ = ':'; |
709 | } | |
710 | *p = '\0'; | |
711 | ||
fef20d9c | 712 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
713 | } |
714 | ||
8a27f7c9 JP |
715 | static char *ip4_string(char *p, const u8 *addr, bool leading_zeros) |
716 | { | |
717 | int i; | |
718 | ||
719 | for (i = 0; i < 4; i++) { | |
720 | char temp[3]; /* hold each IP quad in reverse order */ | |
721 | int digits = put_dec_trunc(temp, addr[i]) - temp; | |
722 | if (leading_zeros) { | |
723 | if (digits < 3) | |
724 | *p++ = '0'; | |
725 | if (digits < 2) | |
726 | *p++ = '0'; | |
727 | } | |
728 | /* reverse the digits in the quad */ | |
729 | while (digits--) | |
730 | *p++ = temp[digits]; | |
731 | if (i < 3) | |
732 | *p++ = '.'; | |
733 | } | |
8a27f7c9 | 734 | *p = '\0'; |
7b9186f5 | 735 | |
8a27f7c9 JP |
736 | return p; |
737 | } | |
738 | ||
eb78cd26 | 739 | static char *ip6_compressed_string(char *p, const char *addr) |
689afa7d | 740 | { |
7b9186f5 | 741 | int i, j, range; |
8a27f7c9 JP |
742 | unsigned char zerolength[8]; |
743 | int longest = 1; | |
744 | int colonpos = -1; | |
745 | u16 word; | |
7b9186f5 | 746 | u8 hi, lo; |
8a27f7c9 | 747 | bool needcolon = false; |
eb78cd26 JP |
748 | bool useIPv4; |
749 | struct in6_addr in6; | |
750 | ||
751 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
752 | ||
753 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
754 | |
755 | memset(zerolength, 0, sizeof(zerolength)); | |
756 | ||
757 | if (useIPv4) | |
758 | range = 6; | |
759 | else | |
760 | range = 8; | |
761 | ||
762 | /* find position of longest 0 run */ | |
763 | for (i = 0; i < range; i++) { | |
764 | for (j = i; j < range; j++) { | |
eb78cd26 | 765 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
766 | break; |
767 | zerolength[i]++; | |
768 | } | |
769 | } | |
770 | for (i = 0; i < range; i++) { | |
771 | if (zerolength[i] > longest) { | |
772 | longest = zerolength[i]; | |
773 | colonpos = i; | |
774 | } | |
775 | } | |
689afa7d | 776 | |
8a27f7c9 JP |
777 | /* emit address */ |
778 | for (i = 0; i < range; i++) { | |
779 | if (i == colonpos) { | |
780 | if (needcolon || i == 0) | |
781 | *p++ = ':'; | |
782 | *p++ = ':'; | |
783 | needcolon = false; | |
784 | i += longest - 1; | |
785 | continue; | |
786 | } | |
787 | if (needcolon) { | |
788 | *p++ = ':'; | |
789 | needcolon = false; | |
790 | } | |
791 | /* hex u16 without leading 0s */ | |
eb78cd26 | 792 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
793 | hi = word >> 8; |
794 | lo = word & 0xff; | |
795 | if (hi) { | |
796 | if (hi > 0x0f) | |
797 | p = pack_hex_byte(p, hi); | |
798 | else | |
799 | *p++ = hex_asc_lo(hi); | |
800 | } | |
801 | if (hi || lo > 0x0f) | |
802 | p = pack_hex_byte(p, lo); | |
803 | else | |
804 | *p++ = hex_asc_lo(lo); | |
805 | needcolon = true; | |
806 | } | |
807 | ||
808 | if (useIPv4) { | |
809 | if (needcolon) | |
810 | *p++ = ':'; | |
eb78cd26 | 811 | p = ip4_string(p, &in6.s6_addr[12], false); |
8a27f7c9 | 812 | } |
8a27f7c9 | 813 | *p = '\0'; |
7b9186f5 | 814 | |
8a27f7c9 JP |
815 | return p; |
816 | } | |
817 | ||
eb78cd26 | 818 | static char *ip6_string(char *p, const char *addr, const char *fmt) |
8a27f7c9 JP |
819 | { |
820 | int i; | |
7b9186f5 | 821 | |
689afa7d | 822 | for (i = 0; i < 8; i++) { |
eb78cd26 JP |
823 | p = pack_hex_byte(p, *addr++); |
824 | p = pack_hex_byte(p, *addr++); | |
8a27f7c9 | 825 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
826 | *p++ = ':'; |
827 | } | |
828 | *p = '\0'; | |
7b9186f5 | 829 | |
8a27f7c9 JP |
830 | return p; |
831 | } | |
832 | ||
833 | static char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
834 | struct printf_spec spec, const char *fmt) | |
835 | { | |
836 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
837 | ||
838 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 839 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 840 | else |
eb78cd26 | 841 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 842 | |
fef20d9c | 843 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
844 | } |
845 | ||
8a27f7c9 JP |
846 | static char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
847 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 848 | { |
8a27f7c9 | 849 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 850 | |
8a27f7c9 | 851 | ip4_string(ip4_addr, addr, fmt[0] == 'i'); |
4aa99606 | 852 | |
fef20d9c | 853 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
854 | } |
855 | ||
4d8a743c LT |
856 | /* |
857 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
858 | * by an extra set of alphanumeric characters that are extended format | |
859 | * specifiers. | |
860 | * | |
332d2e78 LT |
861 | * Right now we handle: |
862 | * | |
0c8b946e FW |
863 | * - 'F' For symbolic function descriptor pointers with offset |
864 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
865 | * - 'S' For symbolic direct pointers with offset |
866 | * - 's' For symbolic direct pointers without offset | |
c7dabef8 BH |
867 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
868 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dd45c9cf HH |
869 | * - 'M' For a 6-byte MAC address, it prints the address in the |
870 | * usual colon-separated hex notation | |
8a27f7c9 JP |
871 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
872 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way | |
873 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
874 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
875 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
876 | * IPv6 omits the colons (01020304...0f) | |
877 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
878 | * - 'I6c' for IPv6 addresses printed as specified by | |
879 | * http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt | |
332d2e78 LT |
880 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
881 | * function pointers are really function descriptors, which contain a | |
882 | * pointer to the real address. | |
4d8a743c | 883 | */ |
fef20d9c FW |
884 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
885 | struct printf_spec spec) | |
78a8bf69 | 886 | { |
d97106ab | 887 | if (!ptr) |
fef20d9c | 888 | return string(buf, end, "(null)", spec); |
d97106ab | 889 | |
0fe1ef24 LT |
890 | switch (*fmt) { |
891 | case 'F': | |
0c8b946e | 892 | case 'f': |
0fe1ef24 | 893 | ptr = dereference_function_descriptor(ptr); |
91adcd2c | 894 | case 's': |
0fe1ef24 LT |
895 | /* Fallthrough */ |
896 | case 'S': | |
0c8b946e | 897 | return symbol_string(buf, end, ptr, spec, *fmt); |
332d2e78 | 898 | case 'R': |
c7dabef8 | 899 | case 'r': |
fd95541e | 900 | return resource_string(buf, end, ptr, spec, fmt); |
8a27f7c9 JP |
901 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
902 | case 'm': /* Contiguous: 000102030405 */ | |
903 | return mac_address_string(buf, end, ptr, spec, fmt); | |
904 | case 'I': /* Formatted IP supported | |
905 | * 4: 1.2.3.4 | |
906 | * 6: 0001:0203:...:0708 | |
907 | * 6c: 1::708 or 1::1.2.3.4 | |
908 | */ | |
909 | case 'i': /* Contiguous: | |
910 | * 4: 001.002.003.004 | |
911 | * 6: 000102...0f | |
912 | */ | |
913 | switch (fmt[1]) { | |
914 | case '6': | |
915 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
916 | case '4': | |
917 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
918 | } | |
fef20d9c FW |
919 | break; |
920 | } | |
921 | spec.flags |= SMALL; | |
922 | if (spec.field_width == -1) { | |
923 | spec.field_width = 2*sizeof(void *); | |
924 | spec.flags |= ZEROPAD; | |
925 | } | |
926 | spec.base = 16; | |
927 | ||
928 | return number(buf, end, (unsigned long) ptr, spec); | |
929 | } | |
930 | ||
931 | /* | |
932 | * Helper function to decode printf style format. | |
933 | * Each call decode a token from the format and return the | |
934 | * number of characters read (or likely the delta where it wants | |
935 | * to go on the next call). | |
936 | * The decoded token is returned through the parameters | |
937 | * | |
938 | * 'h', 'l', or 'L' for integer fields | |
939 | * 'z' support added 23/7/1999 S.H. | |
940 | * 'z' changed to 'Z' --davidm 1/25/99 | |
941 | * 't' added for ptrdiff_t | |
942 | * | |
943 | * @fmt: the format string | |
944 | * @type of the token returned | |
945 | * @flags: various flags such as +, -, # tokens.. | |
946 | * @field_width: overwritten width | |
947 | * @base: base of the number (octal, hex, ...) | |
948 | * @precision: precision of a number | |
949 | * @qualifier: qualifier of a number (long, size_t, ...) | |
950 | */ | |
951 | static int format_decode(const char *fmt, struct printf_spec *spec) | |
952 | { | |
953 | const char *start = fmt; | |
fef20d9c FW |
954 | |
955 | /* we finished early by reading the field width */ | |
ed681a91 | 956 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
957 | if (spec->field_width < 0) { |
958 | spec->field_width = -spec->field_width; | |
959 | spec->flags |= LEFT; | |
960 | } | |
961 | spec->type = FORMAT_TYPE_NONE; | |
962 | goto precision; | |
963 | } | |
964 | ||
965 | /* we finished early by reading the precision */ | |
966 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
967 | if (spec->precision < 0) | |
968 | spec->precision = 0; | |
969 | ||
970 | spec->type = FORMAT_TYPE_NONE; | |
971 | goto qualifier; | |
972 | } | |
973 | ||
974 | /* By default */ | |
975 | spec->type = FORMAT_TYPE_NONE; | |
976 | ||
977 | for (; *fmt ; ++fmt) { | |
978 | if (*fmt == '%') | |
979 | break; | |
980 | } | |
981 | ||
982 | /* Return the current non-format string */ | |
983 | if (fmt != start || !*fmt) | |
984 | return fmt - start; | |
985 | ||
986 | /* Process flags */ | |
987 | spec->flags = 0; | |
988 | ||
989 | while (1) { /* this also skips first '%' */ | |
990 | bool found = true; | |
991 | ||
992 | ++fmt; | |
993 | ||
994 | switch (*fmt) { | |
995 | case '-': spec->flags |= LEFT; break; | |
996 | case '+': spec->flags |= PLUS; break; | |
997 | case ' ': spec->flags |= SPACE; break; | |
998 | case '#': spec->flags |= SPECIAL; break; | |
999 | case '0': spec->flags |= ZEROPAD; break; | |
1000 | default: found = false; | |
1001 | } | |
1002 | ||
1003 | if (!found) | |
1004 | break; | |
1005 | } | |
1006 | ||
1007 | /* get field width */ | |
1008 | spec->field_width = -1; | |
1009 | ||
1010 | if (isdigit(*fmt)) | |
1011 | spec->field_width = skip_atoi(&fmt); | |
1012 | else if (*fmt == '*') { | |
1013 | /* it's the next argument */ | |
ed681a91 | 1014 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1015 | return ++fmt - start; |
1016 | } | |
1017 | ||
1018 | precision: | |
1019 | /* get the precision */ | |
1020 | spec->precision = -1; | |
1021 | if (*fmt == '.') { | |
1022 | ++fmt; | |
1023 | if (isdigit(*fmt)) { | |
1024 | spec->precision = skip_atoi(&fmt); | |
1025 | if (spec->precision < 0) | |
1026 | spec->precision = 0; | |
1027 | } else if (*fmt == '*') { | |
1028 | /* it's the next argument */ | |
adf26f84 | 1029 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1030 | return ++fmt - start; |
1031 | } | |
1032 | } | |
1033 | ||
1034 | qualifier: | |
1035 | /* get the conversion qualifier */ | |
1036 | spec->qualifier = -1; | |
1037 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
1038 | *fmt == 'Z' || *fmt == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1039 | spec->qualifier = *fmt++; |
1040 | if (unlikely(spec->qualifier == *fmt)) { | |
1041 | if (spec->qualifier == 'l') { | |
1042 | spec->qualifier = 'L'; | |
1043 | ++fmt; | |
1044 | } else if (spec->qualifier == 'h') { | |
1045 | spec->qualifier = 'H'; | |
1046 | ++fmt; | |
1047 | } | |
fef20d9c FW |
1048 | } |
1049 | } | |
1050 | ||
1051 | /* default base */ | |
1052 | spec->base = 10; | |
1053 | switch (*fmt) { | |
1054 | case 'c': | |
1055 | spec->type = FORMAT_TYPE_CHAR; | |
1056 | return ++fmt - start; | |
1057 | ||
1058 | case 's': | |
1059 | spec->type = FORMAT_TYPE_STR; | |
1060 | return ++fmt - start; | |
1061 | ||
1062 | case 'p': | |
1063 | spec->type = FORMAT_TYPE_PTR; | |
1064 | return fmt - start; | |
1065 | /* skip alnum */ | |
1066 | ||
1067 | case 'n': | |
1068 | spec->type = FORMAT_TYPE_NRCHARS; | |
1069 | return ++fmt - start; | |
1070 | ||
1071 | case '%': | |
1072 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1073 | return ++fmt - start; | |
1074 | ||
1075 | /* integer number formats - set up the flags and "break" */ | |
1076 | case 'o': | |
1077 | spec->base = 8; | |
1078 | break; | |
1079 | ||
1080 | case 'x': | |
1081 | spec->flags |= SMALL; | |
1082 | ||
1083 | case 'X': | |
1084 | spec->base = 16; | |
1085 | break; | |
1086 | ||
1087 | case 'd': | |
1088 | case 'i': | |
39e874f8 | 1089 | spec->flags |= SIGN; |
fef20d9c | 1090 | case 'u': |
4aa99606 | 1091 | break; |
fef20d9c FW |
1092 | |
1093 | default: | |
1094 | spec->type = FORMAT_TYPE_INVALID; | |
1095 | return fmt - start; | |
0fe1ef24 | 1096 | } |
fef20d9c FW |
1097 | |
1098 | if (spec->qualifier == 'L') | |
1099 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1100 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1101 | if (spec->flags & SIGN) |
fef20d9c FW |
1102 | spec->type = FORMAT_TYPE_LONG; |
1103 | else | |
1104 | spec->type = FORMAT_TYPE_ULONG; | |
1105 | } else if (spec->qualifier == 'Z' || spec->qualifier == 'z') { | |
1106 | spec->type = FORMAT_TYPE_SIZE_T; | |
1107 | } else if (spec->qualifier == 't') { | |
1108 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1109 | } else if (spec->qualifier == 'H') { |
1110 | if (spec->flags & SIGN) | |
1111 | spec->type = FORMAT_TYPE_BYTE; | |
1112 | else | |
1113 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1114 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1115 | if (spec->flags & SIGN) |
fef20d9c FW |
1116 | spec->type = FORMAT_TYPE_SHORT; |
1117 | else | |
1118 | spec->type = FORMAT_TYPE_USHORT; | |
1119 | } else { | |
39e874f8 | 1120 | if (spec->flags & SIGN) |
fef20d9c FW |
1121 | spec->type = FORMAT_TYPE_INT; |
1122 | else | |
1123 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1124 | } |
fef20d9c FW |
1125 | |
1126 | return ++fmt - start; | |
78a8bf69 LT |
1127 | } |
1128 | ||
1da177e4 LT |
1129 | /** |
1130 | * vsnprintf - Format a string and place it in a buffer | |
1131 | * @buf: The buffer to place the result into | |
1132 | * @size: The size of the buffer, including the trailing null space | |
1133 | * @fmt: The format string to use | |
1134 | * @args: Arguments for the format string | |
1135 | * | |
20036fdc | 1136 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1137 | * %pS output the name of a text symbol with offset |
1138 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1139 | * %pF output the name of a function pointer with its offset |
1140 | * %pf output the name of a function pointer without its offset | |
332d2e78 | 1141 | * %pR output the address range in a struct resource |
0efb4d20 | 1142 | * %n is ignored |
20036fdc | 1143 | * |
1da177e4 LT |
1144 | * The return value is the number of characters which would |
1145 | * be generated for the given input, excluding the trailing | |
1146 | * '\0', as per ISO C99. If you want to have the exact | |
1147 | * number of characters written into @buf as return value | |
72fd4a35 | 1148 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1149 | * return is greater than or equal to @size, the resulting |
1150 | * string is truncated. | |
1151 | * | |
1152 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1153 | * You probably want snprintf() instead. |
1da177e4 LT |
1154 | */ |
1155 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1156 | { | |
1da177e4 | 1157 | unsigned long long num; |
1da177e4 | 1158 | char *str, *end, c; |
fef20d9c FW |
1159 | int read; |
1160 | struct printf_spec spec = {0}; | |
1da177e4 | 1161 | |
f796937a JF |
1162 | /* Reject out-of-range values early. Large positive sizes are |
1163 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1164 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1165 | return 0; |
1da177e4 LT |
1166 | |
1167 | str = buf; | |
f796937a | 1168 | end = buf + size; |
1da177e4 | 1169 | |
f796937a JF |
1170 | /* Make sure end is always >= buf */ |
1171 | if (end < buf) { | |
1172 | end = ((void *)-1); | |
1173 | size = end - buf; | |
1da177e4 LT |
1174 | } |
1175 | ||
fef20d9c FW |
1176 | while (*fmt) { |
1177 | const char *old_fmt = fmt; | |
1da177e4 | 1178 | |
fef20d9c | 1179 | read = format_decode(fmt, &spec); |
1da177e4 | 1180 | |
fef20d9c | 1181 | fmt += read; |
1da177e4 | 1182 | |
fef20d9c FW |
1183 | switch (spec.type) { |
1184 | case FORMAT_TYPE_NONE: { | |
1185 | int copy = read; | |
1186 | if (str < end) { | |
1187 | if (copy > end - str) | |
1188 | copy = end - str; | |
1189 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1190 | } |
fef20d9c FW |
1191 | str += read; |
1192 | break; | |
1da177e4 LT |
1193 | } |
1194 | ||
ed681a91 | 1195 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1196 | spec.field_width = va_arg(args, int); |
1197 | break; | |
1da177e4 | 1198 | |
fef20d9c FW |
1199 | case FORMAT_TYPE_PRECISION: |
1200 | spec.precision = va_arg(args, int); | |
1201 | break; | |
1da177e4 | 1202 | |
fef20d9c FW |
1203 | case FORMAT_TYPE_CHAR: |
1204 | if (!(spec.flags & LEFT)) { | |
1205 | while (--spec.field_width > 0) { | |
f796937a | 1206 | if (str < end) |
1da177e4 LT |
1207 | *str = ' '; |
1208 | ++str; | |
1da177e4 | 1209 | |
fef20d9c FW |
1210 | } |
1211 | } | |
1212 | c = (unsigned char) va_arg(args, int); | |
1213 | if (str < end) | |
1214 | *str = c; | |
1215 | ++str; | |
1216 | while (--spec.field_width > 0) { | |
f796937a | 1217 | if (str < end) |
fef20d9c | 1218 | *str = ' '; |
1da177e4 | 1219 | ++str; |
fef20d9c FW |
1220 | } |
1221 | break; | |
1da177e4 | 1222 | |
fef20d9c FW |
1223 | case FORMAT_TYPE_STR: |
1224 | str = string(str, end, va_arg(args, char *), spec); | |
1225 | break; | |
1da177e4 | 1226 | |
fef20d9c FW |
1227 | case FORMAT_TYPE_PTR: |
1228 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1229 | spec); | |
1230 | while (isalnum(*fmt)) | |
1231 | fmt++; | |
1232 | break; | |
1da177e4 | 1233 | |
fef20d9c FW |
1234 | case FORMAT_TYPE_PERCENT_CHAR: |
1235 | if (str < end) | |
1236 | *str = '%'; | |
1237 | ++str; | |
1238 | break; | |
1da177e4 | 1239 | |
fef20d9c FW |
1240 | case FORMAT_TYPE_INVALID: |
1241 | if (str < end) | |
1242 | *str = '%'; | |
1243 | ++str; | |
fef20d9c FW |
1244 | break; |
1245 | ||
1246 | case FORMAT_TYPE_NRCHARS: { | |
1247 | int qualifier = spec.qualifier; | |
1248 | ||
1249 | if (qualifier == 'l') { | |
1250 | long *ip = va_arg(args, long *); | |
1251 | *ip = (str - buf); | |
1252 | } else if (qualifier == 'Z' || | |
1253 | qualifier == 'z') { | |
1254 | size_t *ip = va_arg(args, size_t *); | |
1255 | *ip = (str - buf); | |
1256 | } else { | |
1257 | int *ip = va_arg(args, int *); | |
1258 | *ip = (str - buf); | |
1259 | } | |
1260 | break; | |
1da177e4 | 1261 | } |
fef20d9c FW |
1262 | |
1263 | default: | |
1264 | switch (spec.type) { | |
1265 | case FORMAT_TYPE_LONG_LONG: | |
1266 | num = va_arg(args, long long); | |
1267 | break; | |
1268 | case FORMAT_TYPE_ULONG: | |
1269 | num = va_arg(args, unsigned long); | |
1270 | break; | |
1271 | case FORMAT_TYPE_LONG: | |
1272 | num = va_arg(args, long); | |
1273 | break; | |
1274 | case FORMAT_TYPE_SIZE_T: | |
1275 | num = va_arg(args, size_t); | |
1276 | break; | |
1277 | case FORMAT_TYPE_PTRDIFF: | |
1278 | num = va_arg(args, ptrdiff_t); | |
1279 | break; | |
a4e94ef0 Z |
1280 | case FORMAT_TYPE_UBYTE: |
1281 | num = (unsigned char) va_arg(args, int); | |
1282 | break; | |
1283 | case FORMAT_TYPE_BYTE: | |
1284 | num = (signed char) va_arg(args, int); | |
1285 | break; | |
fef20d9c FW |
1286 | case FORMAT_TYPE_USHORT: |
1287 | num = (unsigned short) va_arg(args, int); | |
1288 | break; | |
1289 | case FORMAT_TYPE_SHORT: | |
1290 | num = (short) va_arg(args, int); | |
1291 | break; | |
39e874f8 FW |
1292 | case FORMAT_TYPE_INT: |
1293 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1294 | break; |
1295 | default: | |
1296 | num = va_arg(args, unsigned int); | |
1297 | } | |
1298 | ||
1299 | str = number(str, end, num, spec); | |
1da177e4 | 1300 | } |
1da177e4 | 1301 | } |
fef20d9c | 1302 | |
f796937a JF |
1303 | if (size > 0) { |
1304 | if (str < end) | |
1305 | *str = '\0'; | |
1306 | else | |
0a6047ee | 1307 | end[-1] = '\0'; |
f796937a | 1308 | } |
fef20d9c | 1309 | |
f796937a | 1310 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1311 | return str-buf; |
fef20d9c | 1312 | |
1da177e4 | 1313 | } |
1da177e4 LT |
1314 | EXPORT_SYMBOL(vsnprintf); |
1315 | ||
1316 | /** | |
1317 | * vscnprintf - Format a string and place it in a buffer | |
1318 | * @buf: The buffer to place the result into | |
1319 | * @size: The size of the buffer, including the trailing null space | |
1320 | * @fmt: The format string to use | |
1321 | * @args: Arguments for the format string | |
1322 | * | |
1323 | * The return value is the number of characters which have been written into | |
1324 | * the @buf not including the trailing '\0'. If @size is <= 0 the function | |
1325 | * returns 0. | |
1326 | * | |
1327 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1328 | * You probably want scnprintf() instead. |
20036fdc AK |
1329 | * |
1330 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1331 | */ |
1332 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1333 | { | |
1334 | int i; | |
1335 | ||
7b9186f5 AGR |
1336 | i = vsnprintf(buf, size, fmt, args); |
1337 | ||
1da177e4 LT |
1338 | return (i >= size) ? (size - 1) : i; |
1339 | } | |
1da177e4 LT |
1340 | EXPORT_SYMBOL(vscnprintf); |
1341 | ||
1342 | /** | |
1343 | * snprintf - Format a string and place it in a buffer | |
1344 | * @buf: The buffer to place the result into | |
1345 | * @size: The size of the buffer, including the trailing null space | |
1346 | * @fmt: The format string to use | |
1347 | * @...: Arguments for the format string | |
1348 | * | |
1349 | * The return value is the number of characters which would be | |
1350 | * generated for the given input, excluding the trailing null, | |
1351 | * as per ISO C99. If the return is greater than or equal to | |
1352 | * @size, the resulting string is truncated. | |
20036fdc AK |
1353 | * |
1354 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1355 | */ |
7b9186f5 | 1356 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1357 | { |
1358 | va_list args; | |
1359 | int i; | |
1360 | ||
1361 | va_start(args, fmt); | |
7b9186f5 | 1362 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1363 | va_end(args); |
7b9186f5 | 1364 | |
1da177e4 LT |
1365 | return i; |
1366 | } | |
1da177e4 LT |
1367 | EXPORT_SYMBOL(snprintf); |
1368 | ||
1369 | /** | |
1370 | * scnprintf - Format a string and place it in a buffer | |
1371 | * @buf: The buffer to place the result into | |
1372 | * @size: The size of the buffer, including the trailing null space | |
1373 | * @fmt: The format string to use | |
1374 | * @...: Arguments for the format string | |
1375 | * | |
1376 | * The return value is the number of characters written into @buf not including | |
ea6f3281 | 1377 | * the trailing '\0'. If @size is <= 0 the function returns 0. |
1da177e4 LT |
1378 | */ |
1379 | ||
7b9186f5 | 1380 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1381 | { |
1382 | va_list args; | |
1383 | int i; | |
1384 | ||
1385 | va_start(args, fmt); | |
1386 | i = vsnprintf(buf, size, fmt, args); | |
1387 | va_end(args); | |
7b9186f5 | 1388 | |
1da177e4 LT |
1389 | return (i >= size) ? (size - 1) : i; |
1390 | } | |
1391 | EXPORT_SYMBOL(scnprintf); | |
1392 | ||
1393 | /** | |
1394 | * vsprintf - Format a string and place it in a buffer | |
1395 | * @buf: The buffer to place the result into | |
1396 | * @fmt: The format string to use | |
1397 | * @args: Arguments for the format string | |
1398 | * | |
1399 | * The function returns the number of characters written | |
72fd4a35 | 1400 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1401 | * buffer overflows. |
1402 | * | |
1403 | * Call this function if you are already dealing with a va_list. | |
72fd4a35 | 1404 | * You probably want sprintf() instead. |
20036fdc AK |
1405 | * |
1406 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1407 | */ |
1408 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1409 | { | |
1410 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1411 | } | |
1da177e4 LT |
1412 | EXPORT_SYMBOL(vsprintf); |
1413 | ||
1414 | /** | |
1415 | * sprintf - Format a string and place it in a buffer | |
1416 | * @buf: The buffer to place the result into | |
1417 | * @fmt: The format string to use | |
1418 | * @...: Arguments for the format string | |
1419 | * | |
1420 | * The function returns the number of characters written | |
72fd4a35 | 1421 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1422 | * buffer overflows. |
20036fdc AK |
1423 | * |
1424 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1425 | */ |
7b9186f5 | 1426 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
1427 | { |
1428 | va_list args; | |
1429 | int i; | |
1430 | ||
1431 | va_start(args, fmt); | |
7b9186f5 | 1432 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 1433 | va_end(args); |
7b9186f5 | 1434 | |
1da177e4 LT |
1435 | return i; |
1436 | } | |
1da177e4 LT |
1437 | EXPORT_SYMBOL(sprintf); |
1438 | ||
4370aa4a LJ |
1439 | #ifdef CONFIG_BINARY_PRINTF |
1440 | /* | |
1441 | * bprintf service: | |
1442 | * vbin_printf() - VA arguments to binary data | |
1443 | * bstr_printf() - Binary data to text string | |
1444 | */ | |
1445 | ||
1446 | /** | |
1447 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1448 | * @bin_buf: The buffer to place args' binary value | |
1449 | * @size: The size of the buffer(by words(32bits), not characters) | |
1450 | * @fmt: The format string to use | |
1451 | * @args: Arguments for the format string | |
1452 | * | |
1453 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1454 | * is skiped. | |
1455 | * | |
1456 | * The return value is the number of words(32bits) which would be generated for | |
1457 | * the given input. | |
1458 | * | |
1459 | * NOTE: | |
1460 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1461 | * valid for bstr_printf(). | |
1462 | */ | |
1463 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1464 | { | |
fef20d9c | 1465 | struct printf_spec spec = {0}; |
4370aa4a | 1466 | char *str, *end; |
fef20d9c | 1467 | int read; |
4370aa4a LJ |
1468 | |
1469 | str = (char *)bin_buf; | |
1470 | end = (char *)(bin_buf + size); | |
1471 | ||
1472 | #define save_arg(type) \ | |
1473 | do { \ | |
1474 | if (sizeof(type) == 8) { \ | |
1475 | unsigned long long value; \ | |
1476 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1477 | value = va_arg(args, unsigned long long); \ | |
1478 | if (str + sizeof(type) <= end) { \ | |
1479 | *(u32 *)str = *(u32 *)&value; \ | |
1480 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1481 | } \ | |
1482 | } else { \ | |
1483 | unsigned long value; \ | |
1484 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1485 | value = va_arg(args, int); \ | |
1486 | if (str + sizeof(type) <= end) \ | |
1487 | *(typeof(type) *)str = (type)value; \ | |
1488 | } \ | |
1489 | str += sizeof(type); \ | |
1490 | } while (0) | |
1491 | ||
fef20d9c FW |
1492 | while (*fmt) { |
1493 | read = format_decode(fmt, &spec); | |
4370aa4a | 1494 | |
fef20d9c | 1495 | fmt += read; |
4370aa4a | 1496 | |
fef20d9c FW |
1497 | switch (spec.type) { |
1498 | case FORMAT_TYPE_NONE: | |
1499 | break; | |
1500 | ||
ed681a91 | 1501 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1502 | case FORMAT_TYPE_PRECISION: |
1503 | save_arg(int); | |
1504 | break; | |
1505 | ||
1506 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1507 | save_arg(char); |
fef20d9c FW |
1508 | break; |
1509 | ||
1510 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1511 | const char *save_str = va_arg(args, char *); |
1512 | size_t len; | |
6c356634 | 1513 | |
4370aa4a LJ |
1514 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1515 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 1516 | save_str = "(null)"; |
6c356634 AGR |
1517 | len = strlen(save_str) + 1; |
1518 | if (str + len < end) | |
1519 | memcpy(str, save_str, len); | |
1520 | str += len; | |
fef20d9c | 1521 | break; |
4370aa4a | 1522 | } |
fef20d9c FW |
1523 | |
1524 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1525 | save_arg(void *); |
1526 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1527 | while (isalnum(*fmt)) |
4370aa4a | 1528 | fmt++; |
fef20d9c FW |
1529 | break; |
1530 | ||
1531 | case FORMAT_TYPE_PERCENT_CHAR: | |
1532 | break; | |
1533 | ||
1534 | case FORMAT_TYPE_INVALID: | |
fef20d9c FW |
1535 | break; |
1536 | ||
1537 | case FORMAT_TYPE_NRCHARS: { | |
4370aa4a | 1538 | /* skip %n 's argument */ |
fef20d9c | 1539 | int qualifier = spec.qualifier; |
4370aa4a LJ |
1540 | void *skip_arg; |
1541 | if (qualifier == 'l') | |
1542 | skip_arg = va_arg(args, long *); | |
1543 | else if (qualifier == 'Z' || qualifier == 'z') | |
1544 | skip_arg = va_arg(args, size_t *); | |
1545 | else | |
1546 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1547 | break; |
4370aa4a | 1548 | } |
fef20d9c FW |
1549 | |
1550 | default: | |
1551 | switch (spec.type) { | |
1552 | ||
1553 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1554 | save_arg(long long); |
fef20d9c FW |
1555 | break; |
1556 | case FORMAT_TYPE_ULONG: | |
1557 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1558 | save_arg(unsigned long); |
fef20d9c FW |
1559 | break; |
1560 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1561 | save_arg(size_t); |
fef20d9c FW |
1562 | break; |
1563 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 1564 | save_arg(ptrdiff_t); |
fef20d9c | 1565 | break; |
a4e94ef0 Z |
1566 | case FORMAT_TYPE_UBYTE: |
1567 | case FORMAT_TYPE_BYTE: | |
1568 | save_arg(char); | |
1569 | break; | |
fef20d9c FW |
1570 | case FORMAT_TYPE_USHORT: |
1571 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 1572 | save_arg(short); |
fef20d9c FW |
1573 | break; |
1574 | default: | |
4370aa4a | 1575 | save_arg(int); |
fef20d9c | 1576 | } |
4370aa4a LJ |
1577 | } |
1578 | } | |
fef20d9c | 1579 | |
7b9186f5 | 1580 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 1581 | #undef save_arg |
4370aa4a LJ |
1582 | } |
1583 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1584 | ||
1585 | /** | |
1586 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1587 | * @buf: The buffer to place the result into | |
1588 | * @size: The size of the buffer, including the trailing null space | |
1589 | * @fmt: The format string to use | |
1590 | * @bin_buf: Binary arguments for the format string | |
1591 | * | |
1592 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1593 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1594 | * a binary buffer that generated by vbin_printf. | |
1595 | * | |
1596 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 1597 | * see vsnprintf comment for details. |
4370aa4a LJ |
1598 | * |
1599 | * The return value is the number of characters which would | |
1600 | * be generated for the given input, excluding the trailing | |
1601 | * '\0', as per ISO C99. If you want to have the exact | |
1602 | * number of characters written into @buf as return value | |
1603 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1604 | * return is greater than or equal to @size, the resulting | |
1605 | * string is truncated. | |
1606 | */ | |
1607 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1608 | { | |
1609 | unsigned long long num; | |
4370aa4a LJ |
1610 | char *str, *end, c; |
1611 | const char *args = (const char *)bin_buf; | |
fef20d9c | 1612 | struct printf_spec spec = {0}; |
4370aa4a | 1613 | |
2f30b1f9 | 1614 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 1615 | return 0; |
4370aa4a LJ |
1616 | |
1617 | str = buf; | |
1618 | end = buf + size; | |
1619 | ||
1620 | #define get_arg(type) \ | |
1621 | ({ \ | |
1622 | typeof(type) value; \ | |
1623 | if (sizeof(type) == 8) { \ | |
1624 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1625 | *(u32 *)&value = *(u32 *)args; \ | |
1626 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1627 | } else { \ | |
1628 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1629 | value = *(typeof(type) *)args; \ | |
1630 | } \ | |
1631 | args += sizeof(type); \ | |
1632 | value; \ | |
1633 | }) | |
1634 | ||
1635 | /* Make sure end is always >= buf */ | |
1636 | if (end < buf) { | |
1637 | end = ((void *)-1); | |
1638 | size = end - buf; | |
1639 | } | |
1640 | ||
fef20d9c FW |
1641 | while (*fmt) { |
1642 | int read; | |
1643 | const char *old_fmt = fmt; | |
4370aa4a | 1644 | |
fef20d9c | 1645 | read = format_decode(fmt, &spec); |
4370aa4a | 1646 | |
fef20d9c | 1647 | fmt += read; |
4370aa4a | 1648 | |
fef20d9c FW |
1649 | switch (spec.type) { |
1650 | case FORMAT_TYPE_NONE: { | |
1651 | int copy = read; | |
1652 | if (str < end) { | |
1653 | if (copy > end - str) | |
1654 | copy = end - str; | |
1655 | memcpy(str, old_fmt, copy); | |
4370aa4a | 1656 | } |
fef20d9c FW |
1657 | str += read; |
1658 | break; | |
4370aa4a LJ |
1659 | } |
1660 | ||
ed681a91 | 1661 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1662 | spec.field_width = get_arg(int); |
1663 | break; | |
4370aa4a | 1664 | |
fef20d9c FW |
1665 | case FORMAT_TYPE_PRECISION: |
1666 | spec.precision = get_arg(int); | |
1667 | break; | |
4370aa4a | 1668 | |
fef20d9c FW |
1669 | case FORMAT_TYPE_CHAR: |
1670 | if (!(spec.flags & LEFT)) { | |
1671 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
1672 | if (str < end) |
1673 | *str = ' '; | |
1674 | ++str; | |
1675 | } | |
1676 | } | |
1677 | c = (unsigned char) get_arg(char); | |
1678 | if (str < end) | |
1679 | *str = c; | |
1680 | ++str; | |
fef20d9c | 1681 | while (--spec.field_width > 0) { |
4370aa4a LJ |
1682 | if (str < end) |
1683 | *str = ' '; | |
1684 | ++str; | |
1685 | } | |
fef20d9c | 1686 | break; |
4370aa4a | 1687 | |
fef20d9c | 1688 | case FORMAT_TYPE_STR: { |
4370aa4a LJ |
1689 | const char *str_arg = args; |
1690 | size_t len = strlen(str_arg); | |
1691 | args += len + 1; | |
fef20d9c FW |
1692 | str = string(str, end, (char *)str_arg, spec); |
1693 | break; | |
4370aa4a LJ |
1694 | } |
1695 | ||
fef20d9c FW |
1696 | case FORMAT_TYPE_PTR: |
1697 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1698 | while (isalnum(*fmt)) | |
4370aa4a | 1699 | fmt++; |
fef20d9c | 1700 | break; |
4370aa4a | 1701 | |
fef20d9c | 1702 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
1703 | if (str < end) |
1704 | *str = '%'; | |
1705 | ++str; | |
4370aa4a LJ |
1706 | break; |
1707 | ||
fef20d9c | 1708 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
1709 | if (str < end) |
1710 | *str = '%'; | |
1711 | ++str; | |
fef20d9c FW |
1712 | break; |
1713 | ||
1714 | case FORMAT_TYPE_NRCHARS: | |
1715 | /* skip */ | |
1716 | break; | |
1717 | ||
1718 | default: | |
1719 | switch (spec.type) { | |
1720 | ||
1721 | case FORMAT_TYPE_LONG_LONG: | |
1722 | num = get_arg(long long); | |
1723 | break; | |
1724 | case FORMAT_TYPE_ULONG: | |
1725 | num = get_arg(unsigned long); | |
1726 | break; | |
1727 | case FORMAT_TYPE_LONG: | |
1728 | num = get_arg(unsigned long); | |
1729 | break; | |
1730 | case FORMAT_TYPE_SIZE_T: | |
1731 | num = get_arg(size_t); | |
1732 | break; | |
1733 | case FORMAT_TYPE_PTRDIFF: | |
1734 | num = get_arg(ptrdiff_t); | |
1735 | break; | |
a4e94ef0 Z |
1736 | case FORMAT_TYPE_UBYTE: |
1737 | num = get_arg(unsigned char); | |
1738 | break; | |
1739 | case FORMAT_TYPE_BYTE: | |
1740 | num = get_arg(signed char); | |
1741 | break; | |
fef20d9c FW |
1742 | case FORMAT_TYPE_USHORT: |
1743 | num = get_arg(unsigned short); | |
1744 | break; | |
1745 | case FORMAT_TYPE_SHORT: | |
1746 | num = get_arg(short); | |
1747 | break; | |
1748 | case FORMAT_TYPE_UINT: | |
1749 | num = get_arg(unsigned int); | |
1750 | break; | |
1751 | default: | |
1752 | num = get_arg(int); | |
1753 | } | |
1754 | ||
1755 | str = number(str, end, num, spec); | |
4370aa4a | 1756 | } |
4370aa4a | 1757 | } |
fef20d9c | 1758 | |
4370aa4a LJ |
1759 | if (size > 0) { |
1760 | if (str < end) | |
1761 | *str = '\0'; | |
1762 | else | |
1763 | end[-1] = '\0'; | |
1764 | } | |
fef20d9c | 1765 | |
4370aa4a LJ |
1766 | #undef get_arg |
1767 | ||
1768 | /* the trailing null byte doesn't count towards the total */ | |
1769 | return str - buf; | |
1770 | } | |
1771 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1772 | ||
1773 | /** | |
1774 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1775 | * @bin_buf: The buffer to place args' binary value | |
1776 | * @size: The size of the buffer(by words(32bits), not characters) | |
1777 | * @fmt: The format string to use | |
1778 | * @...: Arguments for the format string | |
1779 | * | |
1780 | * The function returns the number of words(u32) written | |
1781 | * into @bin_buf. | |
1782 | */ | |
1783 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1784 | { | |
1785 | va_list args; | |
1786 | int ret; | |
1787 | ||
1788 | va_start(args, fmt); | |
1789 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1790 | va_end(args); | |
7b9186f5 | 1791 | |
4370aa4a LJ |
1792 | return ret; |
1793 | } | |
1794 | EXPORT_SYMBOL_GPL(bprintf); | |
1795 | ||
1796 | #endif /* CONFIG_BINARY_PRINTF */ | |
1797 | ||
1da177e4 LT |
1798 | /** |
1799 | * vsscanf - Unformat a buffer into a list of arguments | |
1800 | * @buf: input buffer | |
1801 | * @fmt: format of buffer | |
1802 | * @args: arguments | |
1803 | */ | |
7b9186f5 | 1804 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
1805 | { |
1806 | const char *str = buf; | |
1807 | char *next; | |
1808 | char digit; | |
1809 | int num = 0; | |
7b9186f5 | 1810 | int qualifier, base, field_width; |
1da177e4 LT |
1811 | int is_sign = 0; |
1812 | ||
7b9186f5 | 1813 | while (*fmt && *str) { |
1da177e4 LT |
1814 | /* skip any white space in format */ |
1815 | /* white space in format matchs any amount of | |
1816 | * white space, including none, in the input. | |
1817 | */ | |
1818 | if (isspace(*fmt)) { | |
1819 | while (isspace(*fmt)) | |
1820 | ++fmt; | |
1821 | while (isspace(*str)) | |
1822 | ++str; | |
1823 | } | |
1824 | ||
1825 | /* anything that is not a conversion must match exactly */ | |
1826 | if (*fmt != '%' && *fmt) { | |
1827 | if (*fmt++ != *str++) | |
1828 | break; | |
1829 | continue; | |
1830 | } | |
1831 | ||
1832 | if (!*fmt) | |
1833 | break; | |
1834 | ++fmt; | |
7b9186f5 | 1835 | |
1da177e4 LT |
1836 | /* skip this conversion. |
1837 | * advance both strings to next white space | |
1838 | */ | |
1839 | if (*fmt == '*') { | |
8fccae2c | 1840 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
1841 | fmt++; |
1842 | while (!isspace(*str) && *str) | |
1843 | str++; | |
1844 | continue; | |
1845 | } | |
1846 | ||
1847 | /* get field width */ | |
1848 | field_width = -1; | |
1849 | if (isdigit(*fmt)) | |
1850 | field_width = skip_atoi(&fmt); | |
1851 | ||
1852 | /* get conversion qualifier */ | |
1853 | qualifier = -1; | |
1854 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || | |
1855 | *fmt == 'Z' || *fmt == 'z') { | |
1856 | qualifier = *fmt++; | |
1857 | if (unlikely(qualifier == *fmt)) { | |
1858 | if (qualifier == 'h') { | |
1859 | qualifier = 'H'; | |
1860 | fmt++; | |
1861 | } else if (qualifier == 'l') { | |
1862 | qualifier = 'L'; | |
1863 | fmt++; | |
1864 | } | |
1865 | } | |
1866 | } | |
1867 | base = 10; | |
1868 | is_sign = 0; | |
1869 | ||
1870 | if (!*fmt || !*str) | |
1871 | break; | |
1872 | ||
7b9186f5 | 1873 | switch (*fmt++) { |
1da177e4 LT |
1874 | case 'c': |
1875 | { | |
7b9186f5 | 1876 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
1877 | if (field_width == -1) |
1878 | field_width = 1; | |
1879 | do { | |
1880 | *s++ = *str++; | |
1881 | } while (--field_width > 0 && *str); | |
1882 | num++; | |
1883 | } | |
1884 | continue; | |
1885 | case 's': | |
1886 | { | |
7b9186f5 AGR |
1887 | char *s = (char *)va_arg(args, char *); |
1888 | if (field_width == -1) | |
1da177e4 LT |
1889 | field_width = INT_MAX; |
1890 | /* first, skip leading white space in buffer */ | |
1891 | while (isspace(*str)) | |
1892 | str++; | |
1893 | ||
1894 | /* now copy until next white space */ | |
7b9186f5 | 1895 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 1896 | *s++ = *str++; |
1da177e4 LT |
1897 | *s = '\0'; |
1898 | num++; | |
1899 | } | |
1900 | continue; | |
1901 | case 'n': | |
1902 | /* return number of characters read so far */ | |
1903 | { | |
7b9186f5 | 1904 | int *i = (int *)va_arg(args, int*); |
1da177e4 LT |
1905 | *i = str - buf; |
1906 | } | |
1907 | continue; | |
1908 | case 'o': | |
1909 | base = 8; | |
1910 | break; | |
1911 | case 'x': | |
1912 | case 'X': | |
1913 | base = 16; | |
1914 | break; | |
1915 | case 'i': | |
7b9186f5 | 1916 | base = 0; |
1da177e4 LT |
1917 | case 'd': |
1918 | is_sign = 1; | |
1919 | case 'u': | |
1920 | break; | |
1921 | case '%': | |
1922 | /* looking for '%' in str */ | |
7b9186f5 | 1923 | if (*str++ != '%') |
1da177e4 LT |
1924 | return num; |
1925 | continue; | |
1926 | default: | |
1927 | /* invalid format; stop here */ | |
1928 | return num; | |
1929 | } | |
1930 | ||
1931 | /* have some sort of integer conversion. | |
1932 | * first, skip white space in buffer. | |
1933 | */ | |
1934 | while (isspace(*str)) | |
1935 | str++; | |
1936 | ||
1937 | digit = *str; | |
1938 | if (is_sign && digit == '-') | |
1939 | digit = *(str + 1); | |
1940 | ||
1941 | if (!digit | |
7b9186f5 AGR |
1942 | || (base == 16 && !isxdigit(digit)) |
1943 | || (base == 10 && !isdigit(digit)) | |
1944 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1945 | || (base == 0 && !isdigit(digit))) | |
1946 | break; | |
1da177e4 | 1947 | |
7b9186f5 | 1948 | switch (qualifier) { |
1da177e4 LT |
1949 | case 'H': /* that's 'hh' in format */ |
1950 | if (is_sign) { | |
7b9186f5 AGR |
1951 | signed char *s = (signed char *)va_arg(args, signed char *); |
1952 | *s = (signed char)simple_strtol(str, &next, base); | |
1da177e4 | 1953 | } else { |
7b9186f5 AGR |
1954 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); |
1955 | *s = (unsigned char)simple_strtoul(str, &next, base); | |
1da177e4 LT |
1956 | } |
1957 | break; | |
1958 | case 'h': | |
1959 | if (is_sign) { | |
7b9186f5 AGR |
1960 | short *s = (short *)va_arg(args, short *); |
1961 | *s = (short)simple_strtol(str, &next, base); | |
1da177e4 | 1962 | } else { |
7b9186f5 AGR |
1963 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); |
1964 | *s = (unsigned short)simple_strtoul(str, &next, base); | |
1da177e4 LT |
1965 | } |
1966 | break; | |
1967 | case 'l': | |
1968 | if (is_sign) { | |
7b9186f5 AGR |
1969 | long *l = (long *)va_arg(args, long *); |
1970 | *l = simple_strtol(str, &next, base); | |
1da177e4 | 1971 | } else { |
7b9186f5 AGR |
1972 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); |
1973 | *l = simple_strtoul(str, &next, base); | |
1da177e4 LT |
1974 | } |
1975 | break; | |
1976 | case 'L': | |
1977 | if (is_sign) { | |
7b9186f5 AGR |
1978 | long long *l = (long long *)va_arg(args, long long *); |
1979 | *l = simple_strtoll(str, &next, base); | |
1da177e4 | 1980 | } else { |
7b9186f5 AGR |
1981 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); |
1982 | *l = simple_strtoull(str, &next, base); | |
1da177e4 LT |
1983 | } |
1984 | break; | |
1985 | case 'Z': | |
1986 | case 'z': | |
1987 | { | |
7b9186f5 AGR |
1988 | size_t *s = (size_t *)va_arg(args, size_t *); |
1989 | *s = (size_t)simple_strtoul(str, &next, base); | |
1da177e4 LT |
1990 | } |
1991 | break; | |
1992 | default: | |
1993 | if (is_sign) { | |
7b9186f5 AGR |
1994 | int *i = (int *)va_arg(args, int *); |
1995 | *i = (int)simple_strtol(str, &next, base); | |
1da177e4 | 1996 | } else { |
7b9186f5 AGR |
1997 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); |
1998 | *i = (unsigned int)simple_strtoul(str, &next, base); | |
1da177e4 LT |
1999 | } |
2000 | break; | |
2001 | } | |
2002 | num++; | |
2003 | ||
2004 | if (!next) | |
2005 | break; | |
2006 | str = next; | |
2007 | } | |
c6b40d16 JB |
2008 | |
2009 | /* | |
2010 | * Now we've come all the way through so either the input string or the | |
2011 | * format ended. In the former case, there can be a %n at the current | |
2012 | * position in the format that needs to be filled. | |
2013 | */ | |
2014 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
2015 | int *p = (int *)va_arg(args, int *); | |
2016 | *p = str - buf; | |
2017 | } | |
2018 | ||
1da177e4 LT |
2019 | return num; |
2020 | } | |
1da177e4 LT |
2021 | EXPORT_SYMBOL(vsscanf); |
2022 | ||
2023 | /** | |
2024 | * sscanf - Unformat a buffer into a list of arguments | |
2025 | * @buf: input buffer | |
2026 | * @fmt: formatting of buffer | |
2027 | * @...: resulting arguments | |
2028 | */ | |
7b9186f5 | 2029 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2030 | { |
2031 | va_list args; | |
2032 | int i; | |
2033 | ||
7b9186f5 AGR |
2034 | va_start(args, fmt); |
2035 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2036 | va_end(args); |
7b9186f5 | 2037 | |
1da177e4 LT |
2038 | return i; |
2039 | } | |
1da177e4 | 2040 | EXPORT_SYMBOL(sscanf); |