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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> /* for KSYM_SYMBOL_LEN */ | |
21 | #include <linux/types.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/kallsyms.h> | |
26 | #include <linux/uaccess.h> | |
27 | #include <linux/ioport.h> | |
28 | #include <net/addrconf.h> | |
29 | ||
30 | #include <asm/page.h> /* for PAGE_SIZE */ | |
31 | #include <asm/div64.h> | |
32 | #include <asm/sections.h> /* for dereference_function_descriptor() */ | |
33 | ||
34 | #include "kstrtox.h" | |
35 | ||
36 | /** | |
37 | * simple_strtoull - convert a string to an unsigned long long | |
38 | * @cp: The start of the string | |
39 | * @endp: A pointer to the end of the parsed string will be placed here | |
40 | * @base: The number base to use | |
41 | */ | |
42 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) | |
43 | { | |
44 | unsigned long long result; | |
45 | unsigned int rv; | |
46 | ||
47 | cp = _parse_integer_fixup_radix(cp, &base); | |
48 | rv = _parse_integer(cp, base, &result); | |
49 | /* FIXME */ | |
50 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
51 | ||
52 | if (endp) | |
53 | *endp = (char *)cp; | |
54 | ||
55 | return result; | |
56 | } | |
57 | EXPORT_SYMBOL(simple_strtoull); | |
58 | ||
59 | /** | |
60 | * simple_strtoul - convert a string to an unsigned long | |
61 | * @cp: The start of the string | |
62 | * @endp: A pointer to the end of the parsed string will be placed here | |
63 | * @base: The number base to use | |
64 | */ | |
65 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) | |
66 | { | |
67 | return simple_strtoull(cp, endp, base); | |
68 | } | |
69 | EXPORT_SYMBOL(simple_strtoul); | |
70 | ||
71 | /** | |
72 | * simple_strtol - convert a string to a signed long | |
73 | * @cp: The start of the string | |
74 | * @endp: A pointer to the end of the parsed string will be placed here | |
75 | * @base: The number base to use | |
76 | */ | |
77 | long simple_strtol(const char *cp, char **endp, unsigned int base) | |
78 | { | |
79 | if (*cp == '-') | |
80 | return -simple_strtoul(cp + 1, endp, base); | |
81 | ||
82 | return simple_strtoul(cp, endp, base); | |
83 | } | |
84 | EXPORT_SYMBOL(simple_strtol); | |
85 | ||
86 | /** | |
87 | * simple_strtoll - convert a string to a signed long long | |
88 | * @cp: The start of the string | |
89 | * @endp: A pointer to the end of the parsed string will be placed here | |
90 | * @base: The number base to use | |
91 | */ | |
92 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) | |
93 | { | |
94 | if (*cp == '-') | |
95 | return -simple_strtoull(cp + 1, endp, base); | |
96 | ||
97 | return simple_strtoull(cp, endp, base); | |
98 | } | |
99 | EXPORT_SYMBOL(simple_strtoll); | |
100 | ||
101 | static noinline_for_stack | |
102 | int skip_atoi(const char **s) | |
103 | { | |
104 | int i = 0; | |
105 | ||
106 | while (isdigit(**s)) | |
107 | i = i*10 + *((*s)++) - '0'; | |
108 | ||
109 | return i; | |
110 | } | |
111 | ||
112 | /* Decimal conversion is by far the most typical, and is used | |
113 | * for /proc and /sys data. This directly impacts e.g. top performance | |
114 | * with many processes running. We optimize it for speed | |
115 | * using code from | |
116 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
117 | * (with permission from the author, Douglas W. Jones). */ | |
118 | ||
119 | /* Formats correctly any integer in [0,99999]. | |
120 | * Outputs from one to five digits depending on input. | |
121 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
122 | static noinline_for_stack | |
123 | char *put_dec_trunc(char *buf, unsigned q) | |
124 | { | |
125 | unsigned d3, d2, d1, d0; | |
126 | d1 = (q>>4) & 0xf; | |
127 | d2 = (q>>8) & 0xf; | |
128 | d3 = (q>>12); | |
129 | ||
130 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
131 | q = (d0 * 0xcd) >> 11; | |
132 | d0 = d0 - 10*q; | |
133 | *buf++ = d0 + '0'; /* least significant digit */ | |
134 | d1 = q + 9*d3 + 5*d2 + d1; | |
135 | if (d1 != 0) { | |
136 | q = (d1 * 0xcd) >> 11; | |
137 | d1 = d1 - 10*q; | |
138 | *buf++ = d1 + '0'; /* next digit */ | |
139 | ||
140 | d2 = q + 2*d2; | |
141 | if ((d2 != 0) || (d3 != 0)) { | |
142 | q = (d2 * 0xd) >> 7; | |
143 | d2 = d2 - 10*q; | |
144 | *buf++ = d2 + '0'; /* next digit */ | |
145 | ||
146 | d3 = q + 4*d3; | |
147 | if (d3 != 0) { | |
148 | q = (d3 * 0xcd) >> 11; | |
149 | d3 = d3 - 10*q; | |
150 | *buf++ = d3 + '0'; /* next digit */ | |
151 | if (q != 0) | |
152 | *buf++ = q + '0'; /* most sign. digit */ | |
153 | } | |
154 | } | |
155 | } | |
156 | ||
157 | return buf; | |
158 | } | |
159 | /* Same with if's removed. Always emits five digits */ | |
160 | static noinline_for_stack | |
161 | char *put_dec_full(char *buf, unsigned q) | |
162 | { | |
163 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
164 | /* but anyway, gcc produces better code with full-sized ints */ | |
165 | unsigned d3, d2, d1, d0; | |
166 | d1 = (q>>4) & 0xf; | |
167 | d2 = (q>>8) & 0xf; | |
168 | d3 = (q>>12); | |
169 | ||
170 | /* | |
171 | * Possible ways to approx. divide by 10 | |
172 | * gcc -O2 replaces multiply with shifts and adds | |
173 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
174 | * (x * 0x67) >> 10: 1100111 | |
175 | * (x * 0x34) >> 9: 110100 - same | |
176 | * (x * 0x1a) >> 8: 11010 - same | |
177 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
178 | */ | |
179 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
180 | q = (d0 * 0xcd) >> 11; | |
181 | d0 = d0 - 10*q; | |
182 | *buf++ = d0 + '0'; | |
183 | d1 = q + 9*d3 + 5*d2 + d1; | |
184 | q = (d1 * 0xcd) >> 11; | |
185 | d1 = d1 - 10*q; | |
186 | *buf++ = d1 + '0'; | |
187 | ||
188 | d2 = q + 2*d2; | |
189 | q = (d2 * 0xd) >> 7; | |
190 | d2 = d2 - 10*q; | |
191 | *buf++ = d2 + '0'; | |
192 | ||
193 | d3 = q + 4*d3; | |
194 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
195 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
196 | d3 = d3 - 10*q; | |
197 | *buf++ = d3 + '0'; | |
198 | *buf++ = q + '0'; | |
199 | ||
200 | return buf; | |
201 | } | |
202 | /* No inlining helps gcc to use registers better */ | |
203 | static noinline_for_stack | |
204 | char *put_dec(char *buf, unsigned long long num) | |
205 | { | |
206 | while (1) { | |
207 | unsigned rem; | |
208 | if (num < 100000) | |
209 | return put_dec_trunc(buf, num); | |
210 | rem = do_div(num, 100000); | |
211 | buf = put_dec_full(buf, rem); | |
212 | } | |
213 | } | |
214 | ||
215 | /* | |
216 | * Convert passed number to decimal string. | |
217 | * Returns the length of string. On buffer overflow, returns 0. | |
218 | * | |
219 | * If speed is not important, use snprintf(). It's easy to read the code. | |
220 | */ | |
221 | int num_to_str(char *buf, int size, unsigned long long num) | |
222 | { | |
223 | char tmp[21]; /* Enough for 2^64 in decimal */ | |
224 | int idx, len; | |
225 | ||
226 | len = put_dec(tmp, num) - tmp; | |
227 | ||
228 | if (len > size) | |
229 | return 0; | |
230 | for (idx = 0; idx < len; ++idx) | |
231 | buf[idx] = tmp[len - idx - 1]; | |
232 | return len; | |
233 | } | |
234 | ||
235 | #define ZEROPAD 1 /* pad with zero */ | |
236 | #define SIGN 2 /* unsigned/signed long */ | |
237 | #define PLUS 4 /* show plus */ | |
238 | #define SPACE 8 /* space if plus */ | |
239 | #define LEFT 16 /* left justified */ | |
240 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ | |
241 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
242 | ||
243 | enum format_type { | |
244 | FORMAT_TYPE_NONE, /* Just a string part */ | |
245 | FORMAT_TYPE_WIDTH, | |
246 | FORMAT_TYPE_PRECISION, | |
247 | FORMAT_TYPE_CHAR, | |
248 | FORMAT_TYPE_STR, | |
249 | FORMAT_TYPE_PTR, | |
250 | FORMAT_TYPE_PERCENT_CHAR, | |
251 | FORMAT_TYPE_INVALID, | |
252 | FORMAT_TYPE_LONG_LONG, | |
253 | FORMAT_TYPE_ULONG, | |
254 | FORMAT_TYPE_LONG, | |
255 | FORMAT_TYPE_UBYTE, | |
256 | FORMAT_TYPE_BYTE, | |
257 | FORMAT_TYPE_USHORT, | |
258 | FORMAT_TYPE_SHORT, | |
259 | FORMAT_TYPE_UINT, | |
260 | FORMAT_TYPE_INT, | |
261 | FORMAT_TYPE_NRCHARS, | |
262 | FORMAT_TYPE_SIZE_T, | |
263 | FORMAT_TYPE_PTRDIFF | |
264 | }; | |
265 | ||
266 | struct printf_spec { | |
267 | u8 type; /* format_type enum */ | |
268 | u8 flags; /* flags to number() */ | |
269 | u8 base; /* number base, 8, 10 or 16 only */ | |
270 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
271 | s16 field_width; /* width of output field */ | |
272 | s16 precision; /* # of digits/chars */ | |
273 | }; | |
274 | ||
275 | static noinline_for_stack | |
276 | char *number(char *buf, char *end, unsigned long long num, | |
277 | struct printf_spec spec) | |
278 | { | |
279 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ | |
280 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
281 | ||
282 | char tmp[66]; | |
283 | char sign; | |
284 | char locase; | |
285 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); | |
286 | int i; | |
287 | ||
288 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' | |
289 | * produces same digits or (maybe lowercased) letters */ | |
290 | locase = (spec.flags & SMALL); | |
291 | if (spec.flags & LEFT) | |
292 | spec.flags &= ~ZEROPAD; | |
293 | sign = 0; | |
294 | if (spec.flags & SIGN) { | |
295 | if ((signed long long)num < 0) { | |
296 | sign = '-'; | |
297 | num = -(signed long long)num; | |
298 | spec.field_width--; | |
299 | } else if (spec.flags & PLUS) { | |
300 | sign = '+'; | |
301 | spec.field_width--; | |
302 | } else if (spec.flags & SPACE) { | |
303 | sign = ' '; | |
304 | spec.field_width--; | |
305 | } | |
306 | } | |
307 | if (need_pfx) { | |
308 | spec.field_width--; | |
309 | if (spec.base == 16) | |
310 | spec.field_width--; | |
311 | } | |
312 | ||
313 | /* generate full string in tmp[], in reverse order */ | |
314 | i = 0; | |
315 | if (num == 0) | |
316 | tmp[i++] = '0'; | |
317 | /* Generic code, for any base: | |
318 | else do { | |
319 | tmp[i++] = (digits[do_div(num,base)] | locase); | |
320 | } while (num != 0); | |
321 | */ | |
322 | else if (spec.base != 10) { /* 8 or 16 */ | |
323 | int mask = spec.base - 1; | |
324 | int shift = 3; | |
325 | ||
326 | if (spec.base == 16) | |
327 | shift = 4; | |
328 | do { | |
329 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); | |
330 | num >>= shift; | |
331 | } while (num); | |
332 | } else { /* base 10 */ | |
333 | i = put_dec(tmp, num) - tmp; | |
334 | } | |
335 | ||
336 | /* printing 100 using %2d gives "100", not "00" */ | |
337 | if (i > spec.precision) | |
338 | spec.precision = i; | |
339 | /* leading space padding */ | |
340 | spec.field_width -= spec.precision; | |
341 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
342 | while (--spec.field_width >= 0) { | |
343 | if (buf < end) | |
344 | *buf = ' '; | |
345 | ++buf; | |
346 | } | |
347 | } | |
348 | /* sign */ | |
349 | if (sign) { | |
350 | if (buf < end) | |
351 | *buf = sign; | |
352 | ++buf; | |
353 | } | |
354 | /* "0x" / "0" prefix */ | |
355 | if (need_pfx) { | |
356 | if (buf < end) | |
357 | *buf = '0'; | |
358 | ++buf; | |
359 | if (spec.base == 16) { | |
360 | if (buf < end) | |
361 | *buf = ('X' | locase); | |
362 | ++buf; | |
363 | } | |
364 | } | |
365 | /* zero or space padding */ | |
366 | if (!(spec.flags & LEFT)) { | |
367 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
368 | while (--spec.field_width >= 0) { | |
369 | if (buf < end) | |
370 | *buf = c; | |
371 | ++buf; | |
372 | } | |
373 | } | |
374 | /* hmm even more zero padding? */ | |
375 | while (i <= --spec.precision) { | |
376 | if (buf < end) | |
377 | *buf = '0'; | |
378 | ++buf; | |
379 | } | |
380 | /* actual digits of result */ | |
381 | while (--i >= 0) { | |
382 | if (buf < end) | |
383 | *buf = tmp[i]; | |
384 | ++buf; | |
385 | } | |
386 | /* trailing space padding */ | |
387 | while (--spec.field_width >= 0) { | |
388 | if (buf < end) | |
389 | *buf = ' '; | |
390 | ++buf; | |
391 | } | |
392 | ||
393 | return buf; | |
394 | } | |
395 | ||
396 | static noinline_for_stack | |
397 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
398 | { | |
399 | int len, i; | |
400 | ||
401 | if ((unsigned long)s < PAGE_SIZE) | |
402 | s = "(null)"; | |
403 | ||
404 | len = strnlen(s, spec.precision); | |
405 | ||
406 | if (!(spec.flags & LEFT)) { | |
407 | while (len < spec.field_width--) { | |
408 | if (buf < end) | |
409 | *buf = ' '; | |
410 | ++buf; | |
411 | } | |
412 | } | |
413 | for (i = 0; i < len; ++i) { | |
414 | if (buf < end) | |
415 | *buf = *s; | |
416 | ++buf; ++s; | |
417 | } | |
418 | while (len < spec.field_width--) { | |
419 | if (buf < end) | |
420 | *buf = ' '; | |
421 | ++buf; | |
422 | } | |
423 | ||
424 | return buf; | |
425 | } | |
426 | ||
427 | static noinline_for_stack | |
428 | char *symbol_string(char *buf, char *end, void *ptr, | |
429 | struct printf_spec spec, char ext) | |
430 | { | |
431 | unsigned long value = (unsigned long) ptr; | |
432 | #ifdef CONFIG_KALLSYMS | |
433 | char sym[KSYM_SYMBOL_LEN]; | |
434 | if (ext == 'B') | |
435 | sprint_backtrace(sym, value); | |
436 | else if (ext != 'f' && ext != 's') | |
437 | sprint_symbol(sym, value); | |
438 | else | |
439 | sprint_symbol_no_offset(sym, value); | |
440 | ||
441 | return string(buf, end, sym, spec); | |
442 | #else | |
443 | spec.field_width = 2 * sizeof(void *); | |
444 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
445 | spec.base = 16; | |
446 | ||
447 | return number(buf, end, value, spec); | |
448 | #endif | |
449 | } | |
450 | ||
451 | static noinline_for_stack | |
452 | char *resource_string(char *buf, char *end, struct resource *res, | |
453 | struct printf_spec spec, const char *fmt) | |
454 | { | |
455 | #ifndef IO_RSRC_PRINTK_SIZE | |
456 | #define IO_RSRC_PRINTK_SIZE 6 | |
457 | #endif | |
458 | ||
459 | #ifndef MEM_RSRC_PRINTK_SIZE | |
460 | #define MEM_RSRC_PRINTK_SIZE 10 | |
461 | #endif | |
462 | static const struct printf_spec io_spec = { | |
463 | .base = 16, | |
464 | .field_width = IO_RSRC_PRINTK_SIZE, | |
465 | .precision = -1, | |
466 | .flags = SPECIAL | SMALL | ZEROPAD, | |
467 | }; | |
468 | static const struct printf_spec mem_spec = { | |
469 | .base = 16, | |
470 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
471 | .precision = -1, | |
472 | .flags = SPECIAL | SMALL | ZEROPAD, | |
473 | }; | |
474 | static const struct printf_spec bus_spec = { | |
475 | .base = 16, | |
476 | .field_width = 2, | |
477 | .precision = -1, | |
478 | .flags = SMALL | ZEROPAD, | |
479 | }; | |
480 | static const struct printf_spec dec_spec = { | |
481 | .base = 10, | |
482 | .precision = -1, | |
483 | .flags = 0, | |
484 | }; | |
485 | static const struct printf_spec str_spec = { | |
486 | .field_width = -1, | |
487 | .precision = 10, | |
488 | .flags = LEFT, | |
489 | }; | |
490 | static const struct printf_spec flag_spec = { | |
491 | .base = 16, | |
492 | .precision = -1, | |
493 | .flags = SPECIAL | SMALL, | |
494 | }; | |
495 | ||
496 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
497 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
498 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
499 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
500 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") | |
501 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") | |
502 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
503 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
504 | ||
505 | char *p = sym, *pend = sym + sizeof(sym); | |
506 | int decode = (fmt[0] == 'R') ? 1 : 0; | |
507 | const struct printf_spec *specp; | |
508 | ||
509 | *p++ = '['; | |
510 | if (res->flags & IORESOURCE_IO) { | |
511 | p = string(p, pend, "io ", str_spec); | |
512 | specp = &io_spec; | |
513 | } else if (res->flags & IORESOURCE_MEM) { | |
514 | p = string(p, pend, "mem ", str_spec); | |
515 | specp = &mem_spec; | |
516 | } else if (res->flags & IORESOURCE_IRQ) { | |
517 | p = string(p, pend, "irq ", str_spec); | |
518 | specp = &dec_spec; | |
519 | } else if (res->flags & IORESOURCE_DMA) { | |
520 | p = string(p, pend, "dma ", str_spec); | |
521 | specp = &dec_spec; | |
522 | } else if (res->flags & IORESOURCE_BUS) { | |
523 | p = string(p, pend, "bus ", str_spec); | |
524 | specp = &bus_spec; | |
525 | } else { | |
526 | p = string(p, pend, "??? ", str_spec); | |
527 | specp = &mem_spec; | |
528 | decode = 0; | |
529 | } | |
530 | p = number(p, pend, res->start, *specp); | |
531 | if (res->start != res->end) { | |
532 | *p++ = '-'; | |
533 | p = number(p, pend, res->end, *specp); | |
534 | } | |
535 | if (decode) { | |
536 | if (res->flags & IORESOURCE_MEM_64) | |
537 | p = string(p, pend, " 64bit", str_spec); | |
538 | if (res->flags & IORESOURCE_PREFETCH) | |
539 | p = string(p, pend, " pref", str_spec); | |
540 | if (res->flags & IORESOURCE_WINDOW) | |
541 | p = string(p, pend, " window", str_spec); | |
542 | if (res->flags & IORESOURCE_DISABLED) | |
543 | p = string(p, pend, " disabled", str_spec); | |
544 | } else { | |
545 | p = string(p, pend, " flags ", str_spec); | |
546 | p = number(p, pend, res->flags, flag_spec); | |
547 | } | |
548 | *p++ = ']'; | |
549 | *p = '\0'; | |
550 | ||
551 | return string(buf, end, sym, spec); | |
552 | } | |
553 | ||
554 | static noinline_for_stack | |
555 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
556 | struct printf_spec spec, const char *fmt) | |
557 | { | |
558 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; | |
559 | char *p = mac_addr; | |
560 | int i; | |
561 | char separator; | |
562 | ||
563 | if (fmt[1] == 'F') { /* FDDI canonical format */ | |
564 | separator = '-'; | |
565 | } else { | |
566 | separator = ':'; | |
567 | } | |
568 | ||
569 | for (i = 0; i < 6; i++) { | |
570 | p = hex_byte_pack(p, addr[i]); | |
571 | if (fmt[0] == 'M' && i != 5) | |
572 | *p++ = separator; | |
573 | } | |
574 | *p = '\0'; | |
575 | ||
576 | return string(buf, end, mac_addr, spec); | |
577 | } | |
578 | ||
579 | static noinline_for_stack | |
580 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
581 | { | |
582 | int i; | |
583 | bool leading_zeros = (fmt[0] == 'i'); | |
584 | int index; | |
585 | int step; | |
586 | ||
587 | switch (fmt[2]) { | |
588 | case 'h': | |
589 | #ifdef __BIG_ENDIAN | |
590 | index = 0; | |
591 | step = 1; | |
592 | #else | |
593 | index = 3; | |
594 | step = -1; | |
595 | #endif | |
596 | break; | |
597 | case 'l': | |
598 | index = 3; | |
599 | step = -1; | |
600 | break; | |
601 | case 'n': | |
602 | case 'b': | |
603 | default: | |
604 | index = 0; | |
605 | step = 1; | |
606 | break; | |
607 | } | |
608 | for (i = 0; i < 4; i++) { | |
609 | char temp[3]; /* hold each IP quad in reverse order */ | |
610 | int digits = put_dec_trunc(temp, addr[index]) - temp; | |
611 | if (leading_zeros) { | |
612 | if (digits < 3) | |
613 | *p++ = '0'; | |
614 | if (digits < 2) | |
615 | *p++ = '0'; | |
616 | } | |
617 | /* reverse the digits in the quad */ | |
618 | while (digits--) | |
619 | *p++ = temp[digits]; | |
620 | if (i < 3) | |
621 | *p++ = '.'; | |
622 | index += step; | |
623 | } | |
624 | *p = '\0'; | |
625 | ||
626 | return p; | |
627 | } | |
628 | ||
629 | static noinline_for_stack | |
630 | char *ip6_compressed_string(char *p, const char *addr) | |
631 | { | |
632 | int i, j, range; | |
633 | unsigned char zerolength[8]; | |
634 | int longest = 1; | |
635 | int colonpos = -1; | |
636 | u16 word; | |
637 | u8 hi, lo; | |
638 | bool needcolon = false; | |
639 | bool useIPv4; | |
640 | struct in6_addr in6; | |
641 | ||
642 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
643 | ||
644 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
645 | ||
646 | memset(zerolength, 0, sizeof(zerolength)); | |
647 | ||
648 | if (useIPv4) | |
649 | range = 6; | |
650 | else | |
651 | range = 8; | |
652 | ||
653 | /* find position of longest 0 run */ | |
654 | for (i = 0; i < range; i++) { | |
655 | for (j = i; j < range; j++) { | |
656 | if (in6.s6_addr16[j] != 0) | |
657 | break; | |
658 | zerolength[i]++; | |
659 | } | |
660 | } | |
661 | for (i = 0; i < range; i++) { | |
662 | if (zerolength[i] > longest) { | |
663 | longest = zerolength[i]; | |
664 | colonpos = i; | |
665 | } | |
666 | } | |
667 | if (longest == 1) /* don't compress a single 0 */ | |
668 | colonpos = -1; | |
669 | ||
670 | /* emit address */ | |
671 | for (i = 0; i < range; i++) { | |
672 | if (i == colonpos) { | |
673 | if (needcolon || i == 0) | |
674 | *p++ = ':'; | |
675 | *p++ = ':'; | |
676 | needcolon = false; | |
677 | i += longest - 1; | |
678 | continue; | |
679 | } | |
680 | if (needcolon) { | |
681 | *p++ = ':'; | |
682 | needcolon = false; | |
683 | } | |
684 | /* hex u16 without leading 0s */ | |
685 | word = ntohs(in6.s6_addr16[i]); | |
686 | hi = word >> 8; | |
687 | lo = word & 0xff; | |
688 | if (hi) { | |
689 | if (hi > 0x0f) | |
690 | p = hex_byte_pack(p, hi); | |
691 | else | |
692 | *p++ = hex_asc_lo(hi); | |
693 | p = hex_byte_pack(p, lo); | |
694 | } | |
695 | else if (lo > 0x0f) | |
696 | p = hex_byte_pack(p, lo); | |
697 | else | |
698 | *p++ = hex_asc_lo(lo); | |
699 | needcolon = true; | |
700 | } | |
701 | ||
702 | if (useIPv4) { | |
703 | if (needcolon) | |
704 | *p++ = ':'; | |
705 | p = ip4_string(p, &in6.s6_addr[12], "I4"); | |
706 | } | |
707 | *p = '\0'; | |
708 | ||
709 | return p; | |
710 | } | |
711 | ||
712 | static noinline_for_stack | |
713 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
714 | { | |
715 | int i; | |
716 | ||
717 | for (i = 0; i < 8; i++) { | |
718 | p = hex_byte_pack(p, *addr++); | |
719 | p = hex_byte_pack(p, *addr++); | |
720 | if (fmt[0] == 'I' && i != 7) | |
721 | *p++ = ':'; | |
722 | } | |
723 | *p = '\0'; | |
724 | ||
725 | return p; | |
726 | } | |
727 | ||
728 | static noinline_for_stack | |
729 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
730 | struct printf_spec spec, const char *fmt) | |
731 | { | |
732 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
733 | ||
734 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
735 | ip6_compressed_string(ip6_addr, addr); | |
736 | else | |
737 | ip6_string(ip6_addr, addr, fmt); | |
738 | ||
739 | return string(buf, end, ip6_addr, spec); | |
740 | } | |
741 | ||
742 | static noinline_for_stack | |
743 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
744 | struct printf_spec spec, const char *fmt) | |
745 | { | |
746 | char ip4_addr[sizeof("255.255.255.255")]; | |
747 | ||
748 | ip4_string(ip4_addr, addr, fmt); | |
749 | ||
750 | return string(buf, end, ip4_addr, spec); | |
751 | } | |
752 | ||
753 | static noinline_for_stack | |
754 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
755 | struct printf_spec spec, const char *fmt) | |
756 | { | |
757 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
758 | char *p = uuid; | |
759 | int i; | |
760 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
761 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
762 | const u8 *index = be; | |
763 | bool uc = false; | |
764 | ||
765 | switch (*(++fmt)) { | |
766 | case 'L': | |
767 | uc = true; /* fall-through */ | |
768 | case 'l': | |
769 | index = le; | |
770 | break; | |
771 | case 'B': | |
772 | uc = true; | |
773 | break; | |
774 | } | |
775 | ||
776 | for (i = 0; i < 16; i++) { | |
777 | p = hex_byte_pack(p, addr[index[i]]); | |
778 | switch (i) { | |
779 | case 3: | |
780 | case 5: | |
781 | case 7: | |
782 | case 9: | |
783 | *p++ = '-'; | |
784 | break; | |
785 | } | |
786 | } | |
787 | ||
788 | *p = 0; | |
789 | ||
790 | if (uc) { | |
791 | p = uuid; | |
792 | do { | |
793 | *p = toupper(*p); | |
794 | } while (*(++p)); | |
795 | } | |
796 | ||
797 | return string(buf, end, uuid, spec); | |
798 | } | |
799 | ||
800 | static | |
801 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
802 | struct printf_spec spec) | |
803 | { | |
804 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
805 | if (spec.field_width == -1) | |
806 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
807 | spec.base = 16; | |
808 | ||
809 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
810 | } | |
811 | ||
812 | int kptr_restrict __read_mostly; | |
813 | ||
814 | /* | |
815 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
816 | * by an extra set of alphanumeric characters that are extended format | |
817 | * specifiers. | |
818 | * | |
819 | * Right now we handle: | |
820 | * | |
821 | * - 'F' For symbolic function descriptor pointers with offset | |
822 | * - 'f' For simple symbolic function names without offset | |
823 | * - 'S' For symbolic direct pointers with offset | |
824 | * - 's' For symbolic direct pointers without offset | |
825 | * - 'B' For backtraced symbolic direct pointers with offset | |
826 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] | |
827 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
828 | * - 'M' For a 6-byte MAC address, it prints the address in the | |
829 | * usual colon-separated hex notation | |
830 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons | |
831 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address | |
832 | * with a dash-separated hex notation | |
833 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way | |
834 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
835 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
836 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
837 | * IPv6 omits the colons (01020304...0f) | |
838 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
839 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order | |
840 | * - 'I6c' for IPv6 addresses printed as specified by | |
841 | * http://tools.ietf.org/html/rfc5952 | |
842 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form | |
843 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
844 | * Options for %pU are: | |
845 | * b big endian lower case hex (default) | |
846 | * B big endian UPPER case hex | |
847 | * l little endian lower case hex | |
848 | * L little endian UPPER case hex | |
849 | * big endian output byte order is: | |
850 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
851 | * little endian output byte order is: | |
852 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
853 | * - 'V' For a struct va_format which contains a format string * and va_list *, | |
854 | * call vsnprintf(->format, *->va_list). | |
855 | * Implements a "recursive vsnprintf". | |
856 | * Do not use this feature without some mechanism to verify the | |
857 | * correctness of the format string and va_list arguments. | |
858 | * - 'K' For a kernel pointer that should be hidden from unprivileged users | |
859 | * - 'NF' For a netdev_features_t | |
860 | * | |
861 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 | |
862 | * function pointers are really function descriptors, which contain a | |
863 | * pointer to the real address. | |
864 | */ | |
865 | static noinline_for_stack | |
866 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
867 | struct printf_spec spec) | |
868 | { | |
869 | if (!ptr && *fmt != 'K') { | |
870 | /* | |
871 | * Print (null) with the same width as a pointer so it makes | |
872 | * tabular output look nice. | |
873 | */ | |
874 | if (spec.field_width == -1) | |
875 | spec.field_width = 2 * sizeof(void *); | |
876 | return string(buf, end, "(null)", spec); | |
877 | } | |
878 | ||
879 | switch (*fmt) { | |
880 | case 'F': | |
881 | case 'f': | |
882 | ptr = dereference_function_descriptor(ptr); | |
883 | /* Fallthrough */ | |
884 | case 'S': | |
885 | case 's': | |
886 | case 'B': | |
887 | return symbol_string(buf, end, ptr, spec, *fmt); | |
888 | case 'R': | |
889 | case 'r': | |
890 | return resource_string(buf, end, ptr, spec, fmt); | |
891 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ | |
892 | case 'm': /* Contiguous: 000102030405 */ | |
893 | /* [mM]F (FDDI, bit reversed) */ | |
894 | return mac_address_string(buf, end, ptr, spec, fmt); | |
895 | case 'I': /* Formatted IP supported | |
896 | * 4: 1.2.3.4 | |
897 | * 6: 0001:0203:...:0708 | |
898 | * 6c: 1::708 or 1::1.2.3.4 | |
899 | */ | |
900 | case 'i': /* Contiguous: | |
901 | * 4: 001.002.003.004 | |
902 | * 6: 000102...0f | |
903 | */ | |
904 | switch (fmt[1]) { | |
905 | case '6': | |
906 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
907 | case '4': | |
908 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
909 | } | |
910 | break; | |
911 | case 'U': | |
912 | return uuid_string(buf, end, ptr, spec, fmt); | |
913 | case 'V': | |
914 | { | |
915 | va_list va; | |
916 | ||
917 | va_copy(va, *((struct va_format *)ptr)->va); | |
918 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
919 | ((struct va_format *)ptr)->fmt, va); | |
920 | va_end(va); | |
921 | return buf; | |
922 | } | |
923 | case 'K': | |
924 | /* | |
925 | * %pK cannot be used in IRQ context because its test | |
926 | * for CAP_SYSLOG would be meaningless. | |
927 | */ | |
928 | if (in_irq() || in_serving_softirq() || in_nmi()) { | |
929 | if (spec.field_width == -1) | |
930 | spec.field_width = 2 * sizeof(void *); | |
931 | return string(buf, end, "pK-error", spec); | |
932 | } | |
933 | if (!((kptr_restrict == 0) || | |
934 | (kptr_restrict == 1 && | |
935 | has_capability_noaudit(current, CAP_SYSLOG)))) | |
936 | ptr = NULL; | |
937 | break; | |
938 | case 'N': | |
939 | switch (fmt[1]) { | |
940 | case 'F': | |
941 | return netdev_feature_string(buf, end, ptr, spec); | |
942 | } | |
943 | break; | |
944 | } | |
945 | spec.flags |= SMALL; | |
946 | if (spec.field_width == -1) { | |
947 | spec.field_width = 2 * sizeof(void *); | |
948 | spec.flags |= ZEROPAD; | |
949 | } | |
950 | spec.base = 16; | |
951 | ||
952 | return number(buf, end, (unsigned long) ptr, spec); | |
953 | } | |
954 | ||
955 | /* | |
956 | * Helper function to decode printf style format. | |
957 | * Each call decode a token from the format and return the | |
958 | * number of characters read (or likely the delta where it wants | |
959 | * to go on the next call). | |
960 | * The decoded token is returned through the parameters | |
961 | * | |
962 | * 'h', 'l', or 'L' for integer fields | |
963 | * 'z' support added 23/7/1999 S.H. | |
964 | * 'z' changed to 'Z' --davidm 1/25/99 | |
965 | * 't' added for ptrdiff_t | |
966 | * | |
967 | * @fmt: the format string | |
968 | * @type of the token returned | |
969 | * @flags: various flags such as +, -, # tokens.. | |
970 | * @field_width: overwritten width | |
971 | * @base: base of the number (octal, hex, ...) | |
972 | * @precision: precision of a number | |
973 | * @qualifier: qualifier of a number (long, size_t, ...) | |
974 | */ | |
975 | static noinline_for_stack | |
976 | int format_decode(const char *fmt, struct printf_spec *spec) | |
977 | { | |
978 | const char *start = fmt; | |
979 | ||
980 | /* we finished early by reading the field width */ | |
981 | if (spec->type == FORMAT_TYPE_WIDTH) { | |
982 | if (spec->field_width < 0) { | |
983 | spec->field_width = -spec->field_width; | |
984 | spec->flags |= LEFT; | |
985 | } | |
986 | spec->type = FORMAT_TYPE_NONE; | |
987 | goto precision; | |
988 | } | |
989 | ||
990 | /* we finished early by reading the precision */ | |
991 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
992 | if (spec->precision < 0) | |
993 | spec->precision = 0; | |
994 | ||
995 | spec->type = FORMAT_TYPE_NONE; | |
996 | goto qualifier; | |
997 | } | |
998 | ||
999 | /* By default */ | |
1000 | spec->type = FORMAT_TYPE_NONE; | |
1001 | ||
1002 | for (; *fmt ; ++fmt) { | |
1003 | if (*fmt == '%') | |
1004 | break; | |
1005 | } | |
1006 | ||
1007 | /* Return the current non-format string */ | |
1008 | if (fmt != start || !*fmt) | |
1009 | return fmt - start; | |
1010 | ||
1011 | /* Process flags */ | |
1012 | spec->flags = 0; | |
1013 | ||
1014 | while (1) { /* this also skips first '%' */ | |
1015 | bool found = true; | |
1016 | ||
1017 | ++fmt; | |
1018 | ||
1019 | switch (*fmt) { | |
1020 | case '-': spec->flags |= LEFT; break; | |
1021 | case '+': spec->flags |= PLUS; break; | |
1022 | case ' ': spec->flags |= SPACE; break; | |
1023 | case '#': spec->flags |= SPECIAL; break; | |
1024 | case '0': spec->flags |= ZEROPAD; break; | |
1025 | default: found = false; | |
1026 | } | |
1027 | ||
1028 | if (!found) | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | /* get field width */ | |
1033 | spec->field_width = -1; | |
1034 | ||
1035 | if (isdigit(*fmt)) | |
1036 | spec->field_width = skip_atoi(&fmt); | |
1037 | else if (*fmt == '*') { | |
1038 | /* it's the next argument */ | |
1039 | spec->type = FORMAT_TYPE_WIDTH; | |
1040 | return ++fmt - start; | |
1041 | } | |
1042 | ||
1043 | precision: | |
1044 | /* get the precision */ | |
1045 | spec->precision = -1; | |
1046 | if (*fmt == '.') { | |
1047 | ++fmt; | |
1048 | if (isdigit(*fmt)) { | |
1049 | spec->precision = skip_atoi(&fmt); | |
1050 | if (spec->precision < 0) | |
1051 | spec->precision = 0; | |
1052 | } else if (*fmt == '*') { | |
1053 | /* it's the next argument */ | |
1054 | spec->type = FORMAT_TYPE_PRECISION; | |
1055 | return ++fmt - start; | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | qualifier: | |
1060 | /* get the conversion qualifier */ | |
1061 | spec->qualifier = -1; | |
1062 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
1063 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
1064 | spec->qualifier = *fmt++; | |
1065 | if (unlikely(spec->qualifier == *fmt)) { | |
1066 | if (spec->qualifier == 'l') { | |
1067 | spec->qualifier = 'L'; | |
1068 | ++fmt; | |
1069 | } else if (spec->qualifier == 'h') { | |
1070 | spec->qualifier = 'H'; | |
1071 | ++fmt; | |
1072 | } | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | /* default base */ | |
1077 | spec->base = 10; | |
1078 | switch (*fmt) { | |
1079 | case 'c': | |
1080 | spec->type = FORMAT_TYPE_CHAR; | |
1081 | return ++fmt - start; | |
1082 | ||
1083 | case 's': | |
1084 | spec->type = FORMAT_TYPE_STR; | |
1085 | return ++fmt - start; | |
1086 | ||
1087 | case 'p': | |
1088 | spec->type = FORMAT_TYPE_PTR; | |
1089 | return fmt - start; | |
1090 | /* skip alnum */ | |
1091 | ||
1092 | case 'n': | |
1093 | spec->type = FORMAT_TYPE_NRCHARS; | |
1094 | return ++fmt - start; | |
1095 | ||
1096 | case '%': | |
1097 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1098 | return ++fmt - start; | |
1099 | ||
1100 | /* integer number formats - set up the flags and "break" */ | |
1101 | case 'o': | |
1102 | spec->base = 8; | |
1103 | break; | |
1104 | ||
1105 | case 'x': | |
1106 | spec->flags |= SMALL; | |
1107 | ||
1108 | case 'X': | |
1109 | spec->base = 16; | |
1110 | break; | |
1111 | ||
1112 | case 'd': | |
1113 | case 'i': | |
1114 | spec->flags |= SIGN; | |
1115 | case 'u': | |
1116 | break; | |
1117 | ||
1118 | default: | |
1119 | spec->type = FORMAT_TYPE_INVALID; | |
1120 | return fmt - start; | |
1121 | } | |
1122 | ||
1123 | if (spec->qualifier == 'L') | |
1124 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1125 | else if (spec->qualifier == 'l') { | |
1126 | if (spec->flags & SIGN) | |
1127 | spec->type = FORMAT_TYPE_LONG; | |
1128 | else | |
1129 | spec->type = FORMAT_TYPE_ULONG; | |
1130 | } else if (_tolower(spec->qualifier) == 'z') { | |
1131 | spec->type = FORMAT_TYPE_SIZE_T; | |
1132 | } else if (spec->qualifier == 't') { | |
1133 | spec->type = FORMAT_TYPE_PTRDIFF; | |
1134 | } else if (spec->qualifier == 'H') { | |
1135 | if (spec->flags & SIGN) | |
1136 | spec->type = FORMAT_TYPE_BYTE; | |
1137 | else | |
1138 | spec->type = FORMAT_TYPE_UBYTE; | |
1139 | } else if (spec->qualifier == 'h') { | |
1140 | if (spec->flags & SIGN) | |
1141 | spec->type = FORMAT_TYPE_SHORT; | |
1142 | else | |
1143 | spec->type = FORMAT_TYPE_USHORT; | |
1144 | } else { | |
1145 | if (spec->flags & SIGN) | |
1146 | spec->type = FORMAT_TYPE_INT; | |
1147 | else | |
1148 | spec->type = FORMAT_TYPE_UINT; | |
1149 | } | |
1150 | ||
1151 | return ++fmt - start; | |
1152 | } | |
1153 | ||
1154 | /** | |
1155 | * vsnprintf - Format a string and place it in a buffer | |
1156 | * @buf: The buffer to place the result into | |
1157 | * @size: The size of the buffer, including the trailing null space | |
1158 | * @fmt: The format string to use | |
1159 | * @args: Arguments for the format string | |
1160 | * | |
1161 | * This function follows C99 vsnprintf, but has some extensions: | |
1162 | * %pS output the name of a text symbol with offset | |
1163 | * %ps output the name of a text symbol without offset | |
1164 | * %pF output the name of a function pointer with its offset | |
1165 | * %pf output the name of a function pointer without its offset | |
1166 | * %pB output the name of a backtrace symbol with its offset | |
1167 | * %pR output the address range in a struct resource with decoded flags | |
1168 | * %pr output the address range in a struct resource with raw flags | |
1169 | * %pM output a 6-byte MAC address with colons | |
1170 | * %pm output a 6-byte MAC address without colons | |
1171 | * %pI4 print an IPv4 address without leading zeros | |
1172 | * %pi4 print an IPv4 address with leading zeros | |
1173 | * %pI6 print an IPv6 address with colons | |
1174 | * %pi6 print an IPv6 address without colons | |
1175 | * %pI6c print an IPv6 address as specified by RFC 5952 | |
1176 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper | |
1177 | * case. | |
1178 | * %n is ignored | |
1179 | * | |
1180 | * The return value is the number of characters which would | |
1181 | * be generated for the given input, excluding the trailing | |
1182 | * '\0', as per ISO C99. If you want to have the exact | |
1183 | * number of characters written into @buf as return value | |
1184 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1185 | * return is greater than or equal to @size, the resulting | |
1186 | * string is truncated. | |
1187 | * | |
1188 | * If you're not already dealing with a va_list consider using snprintf(). | |
1189 | */ | |
1190 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1191 | { | |
1192 | unsigned long long num; | |
1193 | char *str, *end; | |
1194 | struct printf_spec spec = {0}; | |
1195 | ||
1196 | /* Reject out-of-range values early. Large positive sizes are | |
1197 | used for unknown buffer sizes. */ | |
1198 | if (WARN_ON_ONCE((int) size < 0)) | |
1199 | return 0; | |
1200 | ||
1201 | str = buf; | |
1202 | end = buf + size; | |
1203 | ||
1204 | /* Make sure end is always >= buf */ | |
1205 | if (end < buf) { | |
1206 | end = ((void *)-1); | |
1207 | size = end - buf; | |
1208 | } | |
1209 | ||
1210 | while (*fmt) { | |
1211 | const char *old_fmt = fmt; | |
1212 | int read = format_decode(fmt, &spec); | |
1213 | ||
1214 | fmt += read; | |
1215 | ||
1216 | switch (spec.type) { | |
1217 | case FORMAT_TYPE_NONE: { | |
1218 | int copy = read; | |
1219 | if (str < end) { | |
1220 | if (copy > end - str) | |
1221 | copy = end - str; | |
1222 | memcpy(str, old_fmt, copy); | |
1223 | } | |
1224 | str += read; | |
1225 | break; | |
1226 | } | |
1227 | ||
1228 | case FORMAT_TYPE_WIDTH: | |
1229 | spec.field_width = va_arg(args, int); | |
1230 | break; | |
1231 | ||
1232 | case FORMAT_TYPE_PRECISION: | |
1233 | spec.precision = va_arg(args, int); | |
1234 | break; | |
1235 | ||
1236 | case FORMAT_TYPE_CHAR: { | |
1237 | char c; | |
1238 | ||
1239 | if (!(spec.flags & LEFT)) { | |
1240 | while (--spec.field_width > 0) { | |
1241 | if (str < end) | |
1242 | *str = ' '; | |
1243 | ++str; | |
1244 | ||
1245 | } | |
1246 | } | |
1247 | c = (unsigned char) va_arg(args, int); | |
1248 | if (str < end) | |
1249 | *str = c; | |
1250 | ++str; | |
1251 | while (--spec.field_width > 0) { | |
1252 | if (str < end) | |
1253 | *str = ' '; | |
1254 | ++str; | |
1255 | } | |
1256 | break; | |
1257 | } | |
1258 | ||
1259 | case FORMAT_TYPE_STR: | |
1260 | str = string(str, end, va_arg(args, char *), spec); | |
1261 | break; | |
1262 | ||
1263 | case FORMAT_TYPE_PTR: | |
1264 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1265 | spec); | |
1266 | while (isalnum(*fmt)) | |
1267 | fmt++; | |
1268 | break; | |
1269 | ||
1270 | case FORMAT_TYPE_PERCENT_CHAR: | |
1271 | if (str < end) | |
1272 | *str = '%'; | |
1273 | ++str; | |
1274 | break; | |
1275 | ||
1276 | case FORMAT_TYPE_INVALID: | |
1277 | if (str < end) | |
1278 | *str = '%'; | |
1279 | ++str; | |
1280 | break; | |
1281 | ||
1282 | case FORMAT_TYPE_NRCHARS: { | |
1283 | u8 qualifier = spec.qualifier; | |
1284 | ||
1285 | if (qualifier == 'l') { | |
1286 | long *ip = va_arg(args, long *); | |
1287 | *ip = (str - buf); | |
1288 | } else if (_tolower(qualifier) == 'z') { | |
1289 | size_t *ip = va_arg(args, size_t *); | |
1290 | *ip = (str - buf); | |
1291 | } else { | |
1292 | int *ip = va_arg(args, int *); | |
1293 | *ip = (str - buf); | |
1294 | } | |
1295 | break; | |
1296 | } | |
1297 | ||
1298 | default: | |
1299 | switch (spec.type) { | |
1300 | case FORMAT_TYPE_LONG_LONG: | |
1301 | num = va_arg(args, long long); | |
1302 | break; | |
1303 | case FORMAT_TYPE_ULONG: | |
1304 | num = va_arg(args, unsigned long); | |
1305 | break; | |
1306 | case FORMAT_TYPE_LONG: | |
1307 | num = va_arg(args, long); | |
1308 | break; | |
1309 | case FORMAT_TYPE_SIZE_T: | |
1310 | num = va_arg(args, size_t); | |
1311 | break; | |
1312 | case FORMAT_TYPE_PTRDIFF: | |
1313 | num = va_arg(args, ptrdiff_t); | |
1314 | break; | |
1315 | case FORMAT_TYPE_UBYTE: | |
1316 | num = (unsigned char) va_arg(args, int); | |
1317 | break; | |
1318 | case FORMAT_TYPE_BYTE: | |
1319 | num = (signed char) va_arg(args, int); | |
1320 | break; | |
1321 | case FORMAT_TYPE_USHORT: | |
1322 | num = (unsigned short) va_arg(args, int); | |
1323 | break; | |
1324 | case FORMAT_TYPE_SHORT: | |
1325 | num = (short) va_arg(args, int); | |
1326 | break; | |
1327 | case FORMAT_TYPE_INT: | |
1328 | num = (int) va_arg(args, int); | |
1329 | break; | |
1330 | default: | |
1331 | num = va_arg(args, unsigned int); | |
1332 | } | |
1333 | ||
1334 | str = number(str, end, num, spec); | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | if (size > 0) { | |
1339 | if (str < end) | |
1340 | *str = '\0'; | |
1341 | else | |
1342 | end[-1] = '\0'; | |
1343 | } | |
1344 | ||
1345 | /* the trailing null byte doesn't count towards the total */ | |
1346 | return str-buf; | |
1347 | ||
1348 | } | |
1349 | EXPORT_SYMBOL(vsnprintf); | |
1350 | ||
1351 | /** | |
1352 | * vscnprintf - Format a string and place it in a buffer | |
1353 | * @buf: The buffer to place the result into | |
1354 | * @size: The size of the buffer, including the trailing null space | |
1355 | * @fmt: The format string to use | |
1356 | * @args: Arguments for the format string | |
1357 | * | |
1358 | * The return value is the number of characters which have been written into | |
1359 | * the @buf not including the trailing '\0'. If @size is == 0 the function | |
1360 | * returns 0. | |
1361 | * | |
1362 | * If you're not already dealing with a va_list consider using scnprintf(). | |
1363 | * | |
1364 | * See the vsnprintf() documentation for format string extensions over C99. | |
1365 | */ | |
1366 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1367 | { | |
1368 | int i; | |
1369 | ||
1370 | i = vsnprintf(buf, size, fmt, args); | |
1371 | ||
1372 | if (likely(i < size)) | |
1373 | return i; | |
1374 | if (size != 0) | |
1375 | return size - 1; | |
1376 | return 0; | |
1377 | } | |
1378 | EXPORT_SYMBOL(vscnprintf); | |
1379 | ||
1380 | /** | |
1381 | * snprintf - Format a string and place it in a buffer | |
1382 | * @buf: The buffer to place the result into | |
1383 | * @size: The size of the buffer, including the trailing null space | |
1384 | * @fmt: The format string to use | |
1385 | * @...: Arguments for the format string | |
1386 | * | |
1387 | * The return value is the number of characters which would be | |
1388 | * generated for the given input, excluding the trailing null, | |
1389 | * as per ISO C99. If the return is greater than or equal to | |
1390 | * @size, the resulting string is truncated. | |
1391 | * | |
1392 | * See the vsnprintf() documentation for format string extensions over C99. | |
1393 | */ | |
1394 | int snprintf(char *buf, size_t size, const char *fmt, ...) | |
1395 | { | |
1396 | va_list args; | |
1397 | int i; | |
1398 | ||
1399 | va_start(args, fmt); | |
1400 | i = vsnprintf(buf, size, fmt, args); | |
1401 | va_end(args); | |
1402 | ||
1403 | return i; | |
1404 | } | |
1405 | EXPORT_SYMBOL(snprintf); | |
1406 | ||
1407 | /** | |
1408 | * scnprintf - Format a string and place it in a buffer | |
1409 | * @buf: The buffer to place the result into | |
1410 | * @size: The size of the buffer, including the trailing null space | |
1411 | * @fmt: The format string to use | |
1412 | * @...: Arguments for the format string | |
1413 | * | |
1414 | * The return value is the number of characters written into @buf not including | |
1415 | * the trailing '\0'. If @size is == 0 the function returns 0. | |
1416 | */ | |
1417 | ||
1418 | int scnprintf(char *buf, size_t size, const char *fmt, ...) | |
1419 | { | |
1420 | va_list args; | |
1421 | int i; | |
1422 | ||
1423 | va_start(args, fmt); | |
1424 | i = vscnprintf(buf, size, fmt, args); | |
1425 | va_end(args); | |
1426 | ||
1427 | return i; | |
1428 | } | |
1429 | EXPORT_SYMBOL(scnprintf); | |
1430 | ||
1431 | /** | |
1432 | * vsprintf - Format a string and place it in a buffer | |
1433 | * @buf: The buffer to place the result into | |
1434 | * @fmt: The format string to use | |
1435 | * @args: Arguments for the format string | |
1436 | * | |
1437 | * The function returns the number of characters written | |
1438 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid | |
1439 | * buffer overflows. | |
1440 | * | |
1441 | * If you're not already dealing with a va_list consider using sprintf(). | |
1442 | * | |
1443 | * See the vsnprintf() documentation for format string extensions over C99. | |
1444 | */ | |
1445 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1446 | { | |
1447 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1448 | } | |
1449 | EXPORT_SYMBOL(vsprintf); | |
1450 | ||
1451 | /** | |
1452 | * sprintf - Format a string and place it in a buffer | |
1453 | * @buf: The buffer to place the result into | |
1454 | * @fmt: The format string to use | |
1455 | * @...: Arguments for the format string | |
1456 | * | |
1457 | * The function returns the number of characters written | |
1458 | * into @buf. Use snprintf() or scnprintf() in order to avoid | |
1459 | * buffer overflows. | |
1460 | * | |
1461 | * See the vsnprintf() documentation for format string extensions over C99. | |
1462 | */ | |
1463 | int sprintf(char *buf, const char *fmt, ...) | |
1464 | { | |
1465 | va_list args; | |
1466 | int i; | |
1467 | ||
1468 | va_start(args, fmt); | |
1469 | i = vsnprintf(buf, INT_MAX, fmt, args); | |
1470 | va_end(args); | |
1471 | ||
1472 | return i; | |
1473 | } | |
1474 | EXPORT_SYMBOL(sprintf); | |
1475 | ||
1476 | #ifdef CONFIG_BINARY_PRINTF | |
1477 | /* | |
1478 | * bprintf service: | |
1479 | * vbin_printf() - VA arguments to binary data | |
1480 | * bstr_printf() - Binary data to text string | |
1481 | */ | |
1482 | ||
1483 | /** | |
1484 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1485 | * @bin_buf: The buffer to place args' binary value | |
1486 | * @size: The size of the buffer(by words(32bits), not characters) | |
1487 | * @fmt: The format string to use | |
1488 | * @args: Arguments for the format string | |
1489 | * | |
1490 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1491 | * is skiped. | |
1492 | * | |
1493 | * The return value is the number of words(32bits) which would be generated for | |
1494 | * the given input. | |
1495 | * | |
1496 | * NOTE: | |
1497 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1498 | * valid for bstr_printf(). | |
1499 | */ | |
1500 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1501 | { | |
1502 | struct printf_spec spec = {0}; | |
1503 | char *str, *end; | |
1504 | ||
1505 | str = (char *)bin_buf; | |
1506 | end = (char *)(bin_buf + size); | |
1507 | ||
1508 | #define save_arg(type) \ | |
1509 | do { \ | |
1510 | if (sizeof(type) == 8) { \ | |
1511 | unsigned long long value; \ | |
1512 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1513 | value = va_arg(args, unsigned long long); \ | |
1514 | if (str + sizeof(type) <= end) { \ | |
1515 | *(u32 *)str = *(u32 *)&value; \ | |
1516 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1517 | } \ | |
1518 | } else { \ | |
1519 | unsigned long value; \ | |
1520 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1521 | value = va_arg(args, int); \ | |
1522 | if (str + sizeof(type) <= end) \ | |
1523 | *(typeof(type) *)str = (type)value; \ | |
1524 | } \ | |
1525 | str += sizeof(type); \ | |
1526 | } while (0) | |
1527 | ||
1528 | while (*fmt) { | |
1529 | int read = format_decode(fmt, &spec); | |
1530 | ||
1531 | fmt += read; | |
1532 | ||
1533 | switch (spec.type) { | |
1534 | case FORMAT_TYPE_NONE: | |
1535 | case FORMAT_TYPE_INVALID: | |
1536 | case FORMAT_TYPE_PERCENT_CHAR: | |
1537 | break; | |
1538 | ||
1539 | case FORMAT_TYPE_WIDTH: | |
1540 | case FORMAT_TYPE_PRECISION: | |
1541 | save_arg(int); | |
1542 | break; | |
1543 | ||
1544 | case FORMAT_TYPE_CHAR: | |
1545 | save_arg(char); | |
1546 | break; | |
1547 | ||
1548 | case FORMAT_TYPE_STR: { | |
1549 | const char *save_str = va_arg(args, char *); | |
1550 | size_t len; | |
1551 | ||
1552 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE | |
1553 | || (unsigned long)save_str < PAGE_SIZE) | |
1554 | save_str = "(null)"; | |
1555 | len = strlen(save_str) + 1; | |
1556 | if (str + len < end) | |
1557 | memcpy(str, save_str, len); | |
1558 | str += len; | |
1559 | break; | |
1560 | } | |
1561 | ||
1562 | case FORMAT_TYPE_PTR: | |
1563 | save_arg(void *); | |
1564 | /* skip all alphanumeric pointer suffixes */ | |
1565 | while (isalnum(*fmt)) | |
1566 | fmt++; | |
1567 | break; | |
1568 | ||
1569 | case FORMAT_TYPE_NRCHARS: { | |
1570 | /* skip %n 's argument */ | |
1571 | u8 qualifier = spec.qualifier; | |
1572 | void *skip_arg; | |
1573 | if (qualifier == 'l') | |
1574 | skip_arg = va_arg(args, long *); | |
1575 | else if (_tolower(qualifier) == 'z') | |
1576 | skip_arg = va_arg(args, size_t *); | |
1577 | else | |
1578 | skip_arg = va_arg(args, int *); | |
1579 | break; | |
1580 | } | |
1581 | ||
1582 | default: | |
1583 | switch (spec.type) { | |
1584 | ||
1585 | case FORMAT_TYPE_LONG_LONG: | |
1586 | save_arg(long long); | |
1587 | break; | |
1588 | case FORMAT_TYPE_ULONG: | |
1589 | case FORMAT_TYPE_LONG: | |
1590 | save_arg(unsigned long); | |
1591 | break; | |
1592 | case FORMAT_TYPE_SIZE_T: | |
1593 | save_arg(size_t); | |
1594 | break; | |
1595 | case FORMAT_TYPE_PTRDIFF: | |
1596 | save_arg(ptrdiff_t); | |
1597 | break; | |
1598 | case FORMAT_TYPE_UBYTE: | |
1599 | case FORMAT_TYPE_BYTE: | |
1600 | save_arg(char); | |
1601 | break; | |
1602 | case FORMAT_TYPE_USHORT: | |
1603 | case FORMAT_TYPE_SHORT: | |
1604 | save_arg(short); | |
1605 | break; | |
1606 | default: | |
1607 | save_arg(int); | |
1608 | } | |
1609 | } | |
1610 | } | |
1611 | ||
1612 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; | |
1613 | #undef save_arg | |
1614 | } | |
1615 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1616 | ||
1617 | /** | |
1618 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1619 | * @buf: The buffer to place the result into | |
1620 | * @size: The size of the buffer, including the trailing null space | |
1621 | * @fmt: The format string to use | |
1622 | * @bin_buf: Binary arguments for the format string | |
1623 | * | |
1624 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1625 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1626 | * a binary buffer that generated by vbin_printf. | |
1627 | * | |
1628 | * The format follows C99 vsnprintf, but has some extensions: | |
1629 | * see vsnprintf comment for details. | |
1630 | * | |
1631 | * The return value is the number of characters which would | |
1632 | * be generated for the given input, excluding the trailing | |
1633 | * '\0', as per ISO C99. If you want to have the exact | |
1634 | * number of characters written into @buf as return value | |
1635 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1636 | * return is greater than or equal to @size, the resulting | |
1637 | * string is truncated. | |
1638 | */ | |
1639 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1640 | { | |
1641 | struct printf_spec spec = {0}; | |
1642 | char *str, *end; | |
1643 | const char *args = (const char *)bin_buf; | |
1644 | ||
1645 | if (WARN_ON_ONCE((int) size < 0)) | |
1646 | return 0; | |
1647 | ||
1648 | str = buf; | |
1649 | end = buf + size; | |
1650 | ||
1651 | #define get_arg(type) \ | |
1652 | ({ \ | |
1653 | typeof(type) value; \ | |
1654 | if (sizeof(type) == 8) { \ | |
1655 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1656 | *(u32 *)&value = *(u32 *)args; \ | |
1657 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1658 | } else { \ | |
1659 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1660 | value = *(typeof(type) *)args; \ | |
1661 | } \ | |
1662 | args += sizeof(type); \ | |
1663 | value; \ | |
1664 | }) | |
1665 | ||
1666 | /* Make sure end is always >= buf */ | |
1667 | if (end < buf) { | |
1668 | end = ((void *)-1); | |
1669 | size = end - buf; | |
1670 | } | |
1671 | ||
1672 | while (*fmt) { | |
1673 | const char *old_fmt = fmt; | |
1674 | int read = format_decode(fmt, &spec); | |
1675 | ||
1676 | fmt += read; | |
1677 | ||
1678 | switch (spec.type) { | |
1679 | case FORMAT_TYPE_NONE: { | |
1680 | int copy = read; | |
1681 | if (str < end) { | |
1682 | if (copy > end - str) | |
1683 | copy = end - str; | |
1684 | memcpy(str, old_fmt, copy); | |
1685 | } | |
1686 | str += read; | |
1687 | break; | |
1688 | } | |
1689 | ||
1690 | case FORMAT_TYPE_WIDTH: | |
1691 | spec.field_width = get_arg(int); | |
1692 | break; | |
1693 | ||
1694 | case FORMAT_TYPE_PRECISION: | |
1695 | spec.precision = get_arg(int); | |
1696 | break; | |
1697 | ||
1698 | case FORMAT_TYPE_CHAR: { | |
1699 | char c; | |
1700 | ||
1701 | if (!(spec.flags & LEFT)) { | |
1702 | while (--spec.field_width > 0) { | |
1703 | if (str < end) | |
1704 | *str = ' '; | |
1705 | ++str; | |
1706 | } | |
1707 | } | |
1708 | c = (unsigned char) get_arg(char); | |
1709 | if (str < end) | |
1710 | *str = c; | |
1711 | ++str; | |
1712 | while (--spec.field_width > 0) { | |
1713 | if (str < end) | |
1714 | *str = ' '; | |
1715 | ++str; | |
1716 | } | |
1717 | break; | |
1718 | } | |
1719 | ||
1720 | case FORMAT_TYPE_STR: { | |
1721 | const char *str_arg = args; | |
1722 | args += strlen(str_arg) + 1; | |
1723 | str = string(str, end, (char *)str_arg, spec); | |
1724 | break; | |
1725 | } | |
1726 | ||
1727 | case FORMAT_TYPE_PTR: | |
1728 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1729 | while (isalnum(*fmt)) | |
1730 | fmt++; | |
1731 | break; | |
1732 | ||
1733 | case FORMAT_TYPE_PERCENT_CHAR: | |
1734 | case FORMAT_TYPE_INVALID: | |
1735 | if (str < end) | |
1736 | *str = '%'; | |
1737 | ++str; | |
1738 | break; | |
1739 | ||
1740 | case FORMAT_TYPE_NRCHARS: | |
1741 | /* skip */ | |
1742 | break; | |
1743 | ||
1744 | default: { | |
1745 | unsigned long long num; | |
1746 | ||
1747 | switch (spec.type) { | |
1748 | ||
1749 | case FORMAT_TYPE_LONG_LONG: | |
1750 | num = get_arg(long long); | |
1751 | break; | |
1752 | case FORMAT_TYPE_ULONG: | |
1753 | case FORMAT_TYPE_LONG: | |
1754 | num = get_arg(unsigned long); | |
1755 | break; | |
1756 | case FORMAT_TYPE_SIZE_T: | |
1757 | num = get_arg(size_t); | |
1758 | break; | |
1759 | case FORMAT_TYPE_PTRDIFF: | |
1760 | num = get_arg(ptrdiff_t); | |
1761 | break; | |
1762 | case FORMAT_TYPE_UBYTE: | |
1763 | num = get_arg(unsigned char); | |
1764 | break; | |
1765 | case FORMAT_TYPE_BYTE: | |
1766 | num = get_arg(signed char); | |
1767 | break; | |
1768 | case FORMAT_TYPE_USHORT: | |
1769 | num = get_arg(unsigned short); | |
1770 | break; | |
1771 | case FORMAT_TYPE_SHORT: | |
1772 | num = get_arg(short); | |
1773 | break; | |
1774 | case FORMAT_TYPE_UINT: | |
1775 | num = get_arg(unsigned int); | |
1776 | break; | |
1777 | default: | |
1778 | num = get_arg(int); | |
1779 | } | |
1780 | ||
1781 | str = number(str, end, num, spec); | |
1782 | } /* default: */ | |
1783 | } /* switch(spec.type) */ | |
1784 | } /* while(*fmt) */ | |
1785 | ||
1786 | if (size > 0) { | |
1787 | if (str < end) | |
1788 | *str = '\0'; | |
1789 | else | |
1790 | end[-1] = '\0'; | |
1791 | } | |
1792 | ||
1793 | #undef get_arg | |
1794 | ||
1795 | /* the trailing null byte doesn't count towards the total */ | |
1796 | return str - buf; | |
1797 | } | |
1798 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1799 | ||
1800 | /** | |
1801 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1802 | * @bin_buf: The buffer to place args' binary value | |
1803 | * @size: The size of the buffer(by words(32bits), not characters) | |
1804 | * @fmt: The format string to use | |
1805 | * @...: Arguments for the format string | |
1806 | * | |
1807 | * The function returns the number of words(u32) written | |
1808 | * into @bin_buf. | |
1809 | */ | |
1810 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1811 | { | |
1812 | va_list args; | |
1813 | int ret; | |
1814 | ||
1815 | va_start(args, fmt); | |
1816 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1817 | va_end(args); | |
1818 | ||
1819 | return ret; | |
1820 | } | |
1821 | EXPORT_SYMBOL_GPL(bprintf); | |
1822 | ||
1823 | #endif /* CONFIG_BINARY_PRINTF */ | |
1824 | ||
1825 | /** | |
1826 | * vsscanf - Unformat a buffer into a list of arguments | |
1827 | * @buf: input buffer | |
1828 | * @fmt: format of buffer | |
1829 | * @args: arguments | |
1830 | */ | |
1831 | int vsscanf(const char *buf, const char *fmt, va_list args) | |
1832 | { | |
1833 | const char *str = buf; | |
1834 | char *next; | |
1835 | char digit; | |
1836 | int num = 0; | |
1837 | u8 qualifier; | |
1838 | u8 base; | |
1839 | s16 field_width; | |
1840 | bool is_sign; | |
1841 | ||
1842 | while (*fmt && *str) { | |
1843 | /* skip any white space in format */ | |
1844 | /* white space in format matchs any amount of | |
1845 | * white space, including none, in the input. | |
1846 | */ | |
1847 | if (isspace(*fmt)) { | |
1848 | fmt = skip_spaces(++fmt); | |
1849 | str = skip_spaces(str); | |
1850 | } | |
1851 | ||
1852 | /* anything that is not a conversion must match exactly */ | |
1853 | if (*fmt != '%' && *fmt) { | |
1854 | if (*fmt++ != *str++) | |
1855 | break; | |
1856 | continue; | |
1857 | } | |
1858 | ||
1859 | if (!*fmt) | |
1860 | break; | |
1861 | ++fmt; | |
1862 | ||
1863 | /* skip this conversion. | |
1864 | * advance both strings to next white space | |
1865 | */ | |
1866 | if (*fmt == '*') { | |
1867 | while (!isspace(*fmt) && *fmt != '%' && *fmt) | |
1868 | fmt++; | |
1869 | while (!isspace(*str) && *str) | |
1870 | str++; | |
1871 | continue; | |
1872 | } | |
1873 | ||
1874 | /* get field width */ | |
1875 | field_width = -1; | |
1876 | if (isdigit(*fmt)) | |
1877 | field_width = skip_atoi(&fmt); | |
1878 | ||
1879 | /* get conversion qualifier */ | |
1880 | qualifier = -1; | |
1881 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
1882 | _tolower(*fmt) == 'z') { | |
1883 | qualifier = *fmt++; | |
1884 | if (unlikely(qualifier == *fmt)) { | |
1885 | if (qualifier == 'h') { | |
1886 | qualifier = 'H'; | |
1887 | fmt++; | |
1888 | } else if (qualifier == 'l') { | |
1889 | qualifier = 'L'; | |
1890 | fmt++; | |
1891 | } | |
1892 | } | |
1893 | } | |
1894 | ||
1895 | if (!*fmt || !*str) | |
1896 | break; | |
1897 | ||
1898 | base = 10; | |
1899 | is_sign = 0; | |
1900 | ||
1901 | switch (*fmt++) { | |
1902 | case 'c': | |
1903 | { | |
1904 | char *s = (char *)va_arg(args, char*); | |
1905 | if (field_width == -1) | |
1906 | field_width = 1; | |
1907 | do { | |
1908 | *s++ = *str++; | |
1909 | } while (--field_width > 0 && *str); | |
1910 | num++; | |
1911 | } | |
1912 | continue; | |
1913 | case 's': | |
1914 | { | |
1915 | char *s = (char *)va_arg(args, char *); | |
1916 | if (field_width == -1) | |
1917 | field_width = SHRT_MAX; | |
1918 | /* first, skip leading white space in buffer */ | |
1919 | str = skip_spaces(str); | |
1920 | ||
1921 | /* now copy until next white space */ | |
1922 | while (*str && !isspace(*str) && field_width--) | |
1923 | *s++ = *str++; | |
1924 | *s = '\0'; | |
1925 | num++; | |
1926 | } | |
1927 | continue; | |
1928 | case 'n': | |
1929 | /* return number of characters read so far */ | |
1930 | { | |
1931 | int *i = (int *)va_arg(args, int*); | |
1932 | *i = str - buf; | |
1933 | } | |
1934 | continue; | |
1935 | case 'o': | |
1936 | base = 8; | |
1937 | break; | |
1938 | case 'x': | |
1939 | case 'X': | |
1940 | base = 16; | |
1941 | break; | |
1942 | case 'i': | |
1943 | base = 0; | |
1944 | case 'd': | |
1945 | is_sign = 1; | |
1946 | case 'u': | |
1947 | break; | |
1948 | case '%': | |
1949 | /* looking for '%' in str */ | |
1950 | if (*str++ != '%') | |
1951 | return num; | |
1952 | continue; | |
1953 | default: | |
1954 | /* invalid format; stop here */ | |
1955 | return num; | |
1956 | } | |
1957 | ||
1958 | /* have some sort of integer conversion. | |
1959 | * first, skip white space in buffer. | |
1960 | */ | |
1961 | str = skip_spaces(str); | |
1962 | ||
1963 | digit = *str; | |
1964 | if (is_sign && digit == '-') | |
1965 | digit = *(str + 1); | |
1966 | ||
1967 | if (!digit | |
1968 | || (base == 16 && !isxdigit(digit)) | |
1969 | || (base == 10 && !isdigit(digit)) | |
1970 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1971 | || (base == 0 && !isdigit(digit))) | |
1972 | break; | |
1973 | ||
1974 | switch (qualifier) { | |
1975 | case 'H': /* that's 'hh' in format */ | |
1976 | if (is_sign) { | |
1977 | signed char *s = (signed char *)va_arg(args, signed char *); | |
1978 | *s = (signed char)simple_strtol(str, &next, base); | |
1979 | } else { | |
1980 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); | |
1981 | *s = (unsigned char)simple_strtoul(str, &next, base); | |
1982 | } | |
1983 | break; | |
1984 | case 'h': | |
1985 | if (is_sign) { | |
1986 | short *s = (short *)va_arg(args, short *); | |
1987 | *s = (short)simple_strtol(str, &next, base); | |
1988 | } else { | |
1989 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); | |
1990 | *s = (unsigned short)simple_strtoul(str, &next, base); | |
1991 | } | |
1992 | break; | |
1993 | case 'l': | |
1994 | if (is_sign) { | |
1995 | long *l = (long *)va_arg(args, long *); | |
1996 | *l = simple_strtol(str, &next, base); | |
1997 | } else { | |
1998 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); | |
1999 | *l = simple_strtoul(str, &next, base); | |
2000 | } | |
2001 | break; | |
2002 | case 'L': | |
2003 | if (is_sign) { | |
2004 | long long *l = (long long *)va_arg(args, long long *); | |
2005 | *l = simple_strtoll(str, &next, base); | |
2006 | } else { | |
2007 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); | |
2008 | *l = simple_strtoull(str, &next, base); | |
2009 | } | |
2010 | break; | |
2011 | case 'Z': | |
2012 | case 'z': | |
2013 | { | |
2014 | size_t *s = (size_t *)va_arg(args, size_t *); | |
2015 | *s = (size_t)simple_strtoul(str, &next, base); | |
2016 | } | |
2017 | break; | |
2018 | default: | |
2019 | if (is_sign) { | |
2020 | int *i = (int *)va_arg(args, int *); | |
2021 | *i = (int)simple_strtol(str, &next, base); | |
2022 | } else { | |
2023 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); | |
2024 | *i = (unsigned int)simple_strtoul(str, &next, base); | |
2025 | } | |
2026 | break; | |
2027 | } | |
2028 | num++; | |
2029 | ||
2030 | if (!next) | |
2031 | break; | |
2032 | str = next; | |
2033 | } | |
2034 | ||
2035 | /* | |
2036 | * Now we've come all the way through so either the input string or the | |
2037 | * format ended. In the former case, there can be a %n at the current | |
2038 | * position in the format that needs to be filled. | |
2039 | */ | |
2040 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
2041 | int *p = (int *)va_arg(args, int *); | |
2042 | *p = str - buf; | |
2043 | } | |
2044 | ||
2045 | return num; | |
2046 | } | |
2047 | EXPORT_SYMBOL(vsscanf); | |
2048 | ||
2049 | /** | |
2050 | * sscanf - Unformat a buffer into a list of arguments | |
2051 | * @buf: input buffer | |
2052 | * @fmt: formatting of buffer | |
2053 | * @...: resulting arguments | |
2054 | */ | |
2055 | int sscanf(const char *buf, const char *fmt, ...) | |
2056 | { | |
2057 | va_list args; | |
2058 | int i; | |
2059 | ||
2060 | va_start(args, fmt); | |
2061 | i = vsscanf(buf, fmt, args); | |
2062 | va_end(args); | |
2063 | ||
2064 | return i; | |
2065 | } | |
2066 | EXPORT_SYMBOL(sscanf); |