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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/math64.h> |
27 | #include <linux/uaccess.h> |
28 | #include <linux/ioport.h> |
29 | #include <linux/dcache.h> |
30 | #include <linux/cred.h> |
31 | #include <net/addrconf.h> |
32 | |
33 | #include <asm/page.h> /* for PAGE_SIZE */ |
34 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
35 | |
36 | #include "kstrtox.h" |
37 | |
38 | /** |
39 | * simple_strtoull - convert a string to an unsigned long long |
40 | * @cp: The start of the string |
41 | * @endp: A pointer to the end of the parsed string will be placed here |
42 | * @base: The number base to use |
43 | * |
44 | * This function is obsolete. Please use kstrtoull instead. |
45 | */ |
46 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
47 | { |
48 | unsigned long long result; |
49 | unsigned int rv; |
50 | |
51 | cp = _parse_integer_fixup_radix(cp, &base); |
52 | rv = _parse_integer(cp, base, &result); |
53 | /* FIXME */ |
54 | cp += (rv & ~KSTRTOX_OVERFLOW); |
55 | |
56 | if (endp) |
57 | *endp = (char *)cp; |
58 | |
59 | return result; |
60 | } |
61 | EXPORT_SYMBOL(simple_strtoull); |
62 | |
63 | /** |
64 | * simple_strtoul - convert a string to an unsigned long |
65 | * @cp: The start of the string |
66 | * @endp: A pointer to the end of the parsed string will be placed here |
67 | * @base: The number base to use |
68 | * |
69 | * This function is obsolete. Please use kstrtoul instead. |
70 | */ |
71 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
72 | { |
73 | return simple_strtoull(cp, endp, base); |
74 | } |
75 | EXPORT_SYMBOL(simple_strtoul); |
76 | |
77 | /** |
78 | * simple_strtol - convert a string to a signed long |
79 | * @cp: The start of the string |
80 | * @endp: A pointer to the end of the parsed string will be placed here |
81 | * @base: The number base to use |
82 | * |
83 | * This function is obsolete. Please use kstrtol instead. |
84 | */ |
85 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
86 | { |
87 | if (*cp == '-') |
88 | return -simple_strtoul(cp + 1, endp, base); |
89 | |
90 | return simple_strtoul(cp, endp, base); |
91 | } |
92 | EXPORT_SYMBOL(simple_strtol); |
93 | |
94 | /** |
95 | * simple_strtoll - convert a string to a signed long long |
96 | * @cp: The start of the string |
97 | * @endp: A pointer to the end of the parsed string will be placed here |
98 | * @base: The number base to use |
99 | * |
100 | * This function is obsolete. Please use kstrtoll instead. |
101 | */ |
102 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
103 | { |
104 | if (*cp == '-') |
105 | return -simple_strtoull(cp + 1, endp, base); |
106 | |
107 | return simple_strtoull(cp, endp, base); |
108 | } |
109 | EXPORT_SYMBOL(simple_strtoll); |
110 | |
111 | static noinline_for_stack |
112 | int skip_atoi(const char **s) |
113 | { |
114 | int i = 0; |
115 | |
116 | while (isdigit(**s)) |
117 | i = i*10 + *((*s)++) - '0'; |
118 | |
119 | return i; |
120 | } |
121 | |
122 | /* Decimal conversion is by far the most typical, and is used |
123 | * for /proc and /sys data. This directly impacts e.g. top performance |
124 | * with many processes running. We optimize it for speed |
125 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
126 | * (with permission from the author, Douglas W. Jones). |
127 | */ |
128 | |
129 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
130 | /* Formats correctly any integer in [0, 999999999] */ |
131 | static noinline_for_stack |
132 | char *put_dec_full9(char *buf, unsigned q) |
133 | { |
134 | unsigned r; |
135 | |
136 | /* |
137 | * Possible ways to approx. divide by 10 |
138 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) |
139 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) |
140 | * (x * 0x6667) >> 18 x < 43699 |
141 | * (x * 0x3334) >> 17 x < 16389 |
142 | * (x * 0x199a) >> 16 x < 16389 |
143 | * (x * 0x0ccd) >> 15 x < 16389 |
144 | * (x * 0x0667) >> 14 x < 2739 |
145 | * (x * 0x0334) >> 13 x < 1029 |
146 | * (x * 0x019a) >> 12 x < 1029 |
147 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) |
148 | * (x * 0x0067) >> 10 x < 179 |
149 | * (x * 0x0034) >> 9 x < 69 same |
150 | * (x * 0x001a) >> 8 x < 69 same |
151 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) |
152 | * (x * 0x0007) >> 6 x < 19 |
153 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
154 | */ |
155 | r = (q * (uint64_t)0x1999999a) >> 32; |
156 | *buf++ = (q - 10 * r) + '0'; /* 1 */ |
157 | q = (r * (uint64_t)0x1999999a) >> 32; |
158 | *buf++ = (r - 10 * q) + '0'; /* 2 */ |
159 | r = (q * (uint64_t)0x1999999a) >> 32; |
160 | *buf++ = (q - 10 * r) + '0'; /* 3 */ |
161 | q = (r * (uint64_t)0x1999999a) >> 32; |
162 | *buf++ = (r - 10 * q) + '0'; /* 4 */ |
163 | r = (q * (uint64_t)0x1999999a) >> 32; |
164 | *buf++ = (q - 10 * r) + '0'; /* 5 */ |
165 | /* Now value is under 10000, can avoid 64-bit multiply */ |
166 | q = (r * 0x199a) >> 16; |
167 | *buf++ = (r - 10 * q) + '0'; /* 6 */ |
168 | r = (q * 0xcd) >> 11; |
169 | *buf++ = (q - 10 * r) + '0'; /* 7 */ |
170 | q = (r * 0xcd) >> 11; |
171 | *buf++ = (r - 10 * q) + '0'; /* 8 */ |
172 | *buf++ = q + '0'; /* 9 */ |
173 | return buf; |
174 | } |
175 | #endif |
176 | |
177 | /* Similar to above but do not pad with zeros. |
178 | * Code can be easily arranged to print 9 digits too, but our callers |
179 | * always call put_dec_full9() instead when the number has 9 decimal digits. |
180 | */ |
181 | static noinline_for_stack |
182 | char *put_dec_trunc8(char *buf, unsigned r) |
183 | { |
184 | unsigned q; |
185 | |
186 | /* Copy of previous function's body with added early returns */ |
187 | while (r >= 10000) { |
188 | q = r + '0'; |
189 | r = (r * (uint64_t)0x1999999a) >> 32; |
190 | *buf++ = q - 10*r; |
191 | } |
192 | |
193 | q = (r * 0x199a) >> 16; /* r <= 9999 */ |
194 | *buf++ = (r - 10 * q) + '0'; |
195 | if (q == 0) |
196 | return buf; |
197 | r = (q * 0xcd) >> 11; /* q <= 999 */ |
198 | *buf++ = (q - 10 * r) + '0'; |
199 | if (r == 0) |
200 | return buf; |
201 | q = (r * 0xcd) >> 11; /* r <= 99 */ |
202 | *buf++ = (r - 10 * q) + '0'; |
203 | if (q == 0) |
204 | return buf; |
205 | *buf++ = q + '0'; /* q <= 9 */ |
206 | return buf; |
207 | } |
208 | |
209 | /* There are two algorithms to print larger numbers. |
210 | * One is generic: divide by 1000000000 and repeatedly print |
211 | * groups of (up to) 9 digits. It's conceptually simple, |
212 | * but requires a (unsigned long long) / 1000000000 division. |
213 | * |
214 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, |
215 | * manipulates them cleverly and generates groups of 4 decimal digits. |
216 | * It so happens that it does NOT require long long division. |
217 | * |
218 | * If long is > 32 bits, division of 64-bit values is relatively easy, |
219 | * and we will use the first algorithm. |
220 | * If long long is > 64 bits (strange architecture with VERY large long long), |
221 | * second algorithm can't be used, and we again use the first one. |
222 | * |
223 | * Else (if long is 32 bits and long long is 64 bits) we use second one. |
224 | */ |
225 | |
226 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
227 | |
228 | /* First algorithm: generic */ |
229 | |
230 | static |
231 | char *put_dec(char *buf, unsigned long long n) |
232 | { |
233 | if (n >= 100*1000*1000) { |
234 | while (n >= 1000*1000*1000) |
235 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); |
236 | if (n >= 100*1000*1000) |
237 | return put_dec_full9(buf, n); |
238 | } |
239 | return put_dec_trunc8(buf, n); |
240 | } |
241 | |
242 | #else |
243 | |
244 | /* Second algorithm: valid only for 64-bit long longs */ |
245 | |
246 | /* See comment in put_dec_full9 for choice of constants */ |
247 | static noinline_for_stack |
248 | void put_dec_full4(char *buf, unsigned q) |
249 | { |
250 | unsigned r; |
251 | r = (q * 0xccd) >> 15; |
252 | buf[0] = (q - 10 * r) + '0'; |
253 | q = (r * 0xcd) >> 11; |
254 | buf[1] = (r - 10 * q) + '0'; |
255 | r = (q * 0xcd) >> 11; |
256 | buf[2] = (q - 10 * r) + '0'; |
257 | buf[3] = r + '0'; |
258 | } |
259 | |
260 | /* |
261 | * Call put_dec_full4 on x % 10000, return x / 10000. |
262 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 |
263 | * holds for all x < 1,128,869,999. The largest value this |
264 | * helper will ever be asked to convert is 1,125,520,955. |
265 | * (d1 in the put_dec code, assuming n is all-ones). |
266 | */ |
267 | static |
268 | unsigned put_dec_helper4(char *buf, unsigned x) |
269 | { |
270 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; |
271 | |
272 | put_dec_full4(buf, x - q * 10000); |
273 | return q; |
274 | } |
275 | |
276 | /* Based on code by Douglas W. Jones found at |
277 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> |
278 | * (with permission from the author). |
279 | * Performs no 64-bit division and hence should be fast on 32-bit machines. |
280 | */ |
281 | static |
282 | char *put_dec(char *buf, unsigned long long n) |
283 | { |
284 | uint32_t d3, d2, d1, q, h; |
285 | |
286 | if (n < 100*1000*1000) |
287 | return put_dec_trunc8(buf, n); |
288 | |
289 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ |
290 | h = (n >> 32); |
291 | d2 = (h ) & 0xffff; |
292 | d3 = (h >> 16); /* implicit "& 0xffff" */ |
293 | |
294 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
295 | q = put_dec_helper4(buf, q); |
296 | |
297 | q += 7671 * d3 + 9496 * d2 + 6 * d1; |
298 | q = put_dec_helper4(buf+4, q); |
299 | |
300 | q += 4749 * d3 + 42 * d2; |
301 | q = put_dec_helper4(buf+8, q); |
302 | |
303 | q += 281 * d3; |
304 | buf += 12; |
305 | if (q) |
306 | buf = put_dec_trunc8(buf, q); |
307 | else while (buf[-1] == '0') |
308 | --buf; |
309 | |
310 | return buf; |
311 | } |
312 | |
313 | #endif |
314 | |
315 | /* |
316 | * Convert passed number to decimal string. |
317 | * Returns the length of string. On buffer overflow, returns 0. |
318 | * |
319 | * If speed is not important, use snprintf(). It's easy to read the code. |
320 | */ |
321 | int num_to_str(char *buf, int size, unsigned long long num) |
322 | { |
323 | char tmp[sizeof(num) * 3]; |
324 | int idx, len; |
325 | |
326 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
327 | if (num <= 9) { |
328 | tmp[0] = '0' + num; |
329 | len = 1; |
330 | } else { |
331 | len = put_dec(tmp, num) - tmp; |
332 | } |
333 | |
334 | if (len > size) |
335 | return 0; |
336 | for (idx = 0; idx < len; ++idx) |
337 | buf[idx] = tmp[len - idx - 1]; |
338 | return len; |
339 | } |
340 | |
341 | #define ZEROPAD 1 /* pad with zero */ |
342 | #define SIGN 2 /* unsigned/signed long */ |
343 | #define PLUS 4 /* show plus */ |
344 | #define SPACE 8 /* space if plus */ |
345 | #define LEFT 16 /* left justified */ |
346 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
347 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ |
348 | |
349 | enum format_type { |
350 | FORMAT_TYPE_NONE, /* Just a string part */ |
351 | FORMAT_TYPE_WIDTH, |
352 | FORMAT_TYPE_PRECISION, |
353 | FORMAT_TYPE_CHAR, |
354 | FORMAT_TYPE_STR, |
355 | FORMAT_TYPE_PTR, |
356 | FORMAT_TYPE_PERCENT_CHAR, |
357 | FORMAT_TYPE_INVALID, |
358 | FORMAT_TYPE_LONG_LONG, |
359 | FORMAT_TYPE_ULONG, |
360 | FORMAT_TYPE_LONG, |
361 | FORMAT_TYPE_UBYTE, |
362 | FORMAT_TYPE_BYTE, |
363 | FORMAT_TYPE_USHORT, |
364 | FORMAT_TYPE_SHORT, |
365 | FORMAT_TYPE_UINT, |
366 | FORMAT_TYPE_INT, |
367 | FORMAT_TYPE_SIZE_T, |
368 | FORMAT_TYPE_PTRDIFF |
369 | }; |
370 | |
371 | struct printf_spec { |
372 | u8 type; /* format_type enum */ |
373 | u8 flags; /* flags to number() */ |
374 | u8 base; /* number base, 8, 10 or 16 only */ |
375 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ |
376 | s16 field_width; /* width of output field */ |
377 | s16 precision; /* # of digits/chars */ |
378 | }; |
379 | |
380 | static noinline_for_stack |
381 | char *number(char *buf, char *end, unsigned long long num, |
382 | struct printf_spec spec) |
383 | { |
384 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
385 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ |
386 | |
387 | char tmp[66]; |
388 | char sign; |
389 | char locase; |
390 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
391 | int i; |
392 | bool is_zero = num == 0LL; |
393 | |
394 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
395 | * produces same digits or (maybe lowercased) letters */ |
396 | locase = (spec.flags & SMALL); |
397 | if (spec.flags & LEFT) |
398 | spec.flags &= ~ZEROPAD; |
399 | sign = 0; |
400 | if (spec.flags & SIGN) { |
401 | if ((signed long long)num < 0) { |
402 | sign = '-'; |
403 | num = -(signed long long)num; |
404 | spec.field_width--; |
405 | } else if (spec.flags & PLUS) { |
406 | sign = '+'; |
407 | spec.field_width--; |
408 | } else if (spec.flags & SPACE) { |
409 | sign = ' '; |
410 | spec.field_width--; |
411 | } |
412 | } |
413 | if (need_pfx) { |
414 | if (spec.base == 16) |
415 | spec.field_width -= 2; |
416 | else if (!is_zero) |
417 | spec.field_width--; |
418 | } |
419 | |
420 | /* generate full string in tmp[], in reverse order */ |
421 | i = 0; |
422 | if (num < spec.base) |
423 | tmp[i++] = digits[num] | locase; |
424 | /* Generic code, for any base: |
425 | else do { |
426 | tmp[i++] = (digits[do_div(num,base)] | locase); |
427 | } while (num != 0); |
428 | */ |
429 | else if (spec.base != 10) { /* 8 or 16 */ |
430 | int mask = spec.base - 1; |
431 | int shift = 3; |
432 | |
433 | if (spec.base == 16) |
434 | shift = 4; |
435 | do { |
436 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
437 | num >>= shift; |
438 | } while (num); |
439 | } else { /* base 10 */ |
440 | i = put_dec(tmp, num) - tmp; |
441 | } |
442 | |
443 | /* printing 100 using %2d gives "100", not "00" */ |
444 | if (i > spec.precision) |
445 | spec.precision = i; |
446 | /* leading space padding */ |
447 | spec.field_width -= spec.precision; |
448 | if (!(spec.flags & (ZEROPAD+LEFT))) { |
449 | while (--spec.field_width >= 0) { |
450 | if (buf < end) |
451 | *buf = ' '; |
452 | ++buf; |
453 | } |
454 | } |
455 | /* sign */ |
456 | if (sign) { |
457 | if (buf < end) |
458 | *buf = sign; |
459 | ++buf; |
460 | } |
461 | /* "0x" / "0" prefix */ |
462 | if (need_pfx) { |
463 | if (spec.base == 16 || !is_zero) { |
464 | if (buf < end) |
465 | *buf = '0'; |
466 | ++buf; |
467 | } |
468 | if (spec.base == 16) { |
469 | if (buf < end) |
470 | *buf = ('X' | locase); |
471 | ++buf; |
472 | } |
473 | } |
474 | /* zero or space padding */ |
475 | if (!(spec.flags & LEFT)) { |
476 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; |
477 | while (--spec.field_width >= 0) { |
478 | if (buf < end) |
479 | *buf = c; |
480 | ++buf; |
481 | } |
482 | } |
483 | /* hmm even more zero padding? */ |
484 | while (i <= --spec.precision) { |
485 | if (buf < end) |
486 | *buf = '0'; |
487 | ++buf; |
488 | } |
489 | /* actual digits of result */ |
490 | while (--i >= 0) { |
491 | if (buf < end) |
492 | *buf = tmp[i]; |
493 | ++buf; |
494 | } |
495 | /* trailing space padding */ |
496 | while (--spec.field_width >= 0) { |
497 | if (buf < end) |
498 | *buf = ' '; |
499 | ++buf; |
500 | } |
501 | |
502 | return buf; |
503 | } |
504 | |
505 | static noinline_for_stack |
506 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) |
507 | { |
508 | int len, i; |
509 | |
510 | if ((unsigned long)s < PAGE_SIZE) |
511 | s = "(null)"; |
512 | |
513 | len = strnlen(s, spec.precision); |
514 | |
515 | if (!(spec.flags & LEFT)) { |
516 | while (len < spec.field_width--) { |
517 | if (buf < end) |
518 | *buf = ' '; |
519 | ++buf; |
520 | } |
521 | } |
522 | for (i = 0; i < len; ++i) { |
523 | if (buf < end) |
524 | *buf = *s; |
525 | ++buf; ++s; |
526 | } |
527 | while (len < spec.field_width--) { |
528 | if (buf < end) |
529 | *buf = ' '; |
530 | ++buf; |
531 | } |
532 | |
533 | return buf; |
534 | } |
535 | |
536 | static void widen(char *buf, char *end, unsigned len, unsigned spaces) |
537 | { |
538 | size_t size; |
539 | if (buf >= end) /* nowhere to put anything */ |
540 | return; |
541 | size = end - buf; |
542 | if (size <= spaces) { |
543 | memset(buf, ' ', size); |
544 | return; |
545 | } |
546 | if (len) { |
547 | if (len > size - spaces) |
548 | len = size - spaces; |
549 | memmove(buf + spaces, buf, len); |
550 | } |
551 | memset(buf, ' ', spaces); |
552 | } |
553 | |
554 | static noinline_for_stack |
555 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, |
556 | const char *fmt) |
557 | { |
558 | const char *array[4], *s; |
559 | const struct dentry *p; |
560 | int depth; |
561 | int i, n; |
562 | |
563 | switch (fmt[1]) { |
564 | case '2': case '3': case '4': |
565 | depth = fmt[1] - '0'; |
566 | break; |
567 | default: |
568 | depth = 1; |
569 | } |
570 | |
571 | rcu_read_lock(); |
572 | for (i = 0; i < depth; i++, d = p) { |
573 | p = ACCESS_ONCE(d->d_parent); |
574 | array[i] = ACCESS_ONCE(d->d_name.name); |
575 | if (p == d) { |
576 | if (i) |
577 | array[i] = ""; |
578 | i++; |
579 | break; |
580 | } |
581 | } |
582 | s = array[--i]; |
583 | for (n = 0; n != spec.precision; n++, buf++) { |
584 | char c = *s++; |
585 | if (!c) { |
586 | if (!i) |
587 | break; |
588 | c = '/'; |
589 | s = array[--i]; |
590 | } |
591 | if (buf < end) |
592 | *buf = c; |
593 | } |
594 | rcu_read_unlock(); |
595 | if (n < spec.field_width) { |
596 | /* we want to pad the sucker */ |
597 | unsigned spaces = spec.field_width - n; |
598 | if (!(spec.flags & LEFT)) { |
599 | widen(buf - n, end, n, spaces); |
600 | return buf + spaces; |
601 | } |
602 | while (spaces--) { |
603 | if (buf < end) |
604 | *buf = ' '; |
605 | ++buf; |
606 | } |
607 | } |
608 | return buf; |
609 | } |
610 | |
611 | static noinline_for_stack |
612 | char *symbol_string(char *buf, char *end, void *ptr, |
613 | struct printf_spec spec, const char *fmt) |
614 | { |
615 | unsigned long value; |
616 | #ifdef CONFIG_KALLSYMS |
617 | char sym[KSYM_SYMBOL_LEN]; |
618 | #endif |
619 | |
620 | if (fmt[1] == 'R') |
621 | ptr = __builtin_extract_return_addr(ptr); |
622 | value = (unsigned long)ptr; |
623 | |
624 | #ifdef CONFIG_KALLSYMS |
625 | if (*fmt == 'B') |
626 | sprint_backtrace(sym, value); |
627 | else if (*fmt != 'f' && *fmt != 's') |
628 | sprint_symbol(sym, value); |
629 | else |
630 | sprint_symbol_no_offset(sym, value); |
631 | |
632 | return string(buf, end, sym, spec); |
633 | #else |
634 | spec.field_width = 2 * sizeof(void *); |
635 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
636 | spec.base = 16; |
637 | |
638 | return number(buf, end, value, spec); |
639 | #endif |
640 | } |
641 | |
642 | static noinline_for_stack |
643 | char *resource_string(char *buf, char *end, struct resource *res, |
644 | struct printf_spec spec, const char *fmt) |
645 | { |
646 | #ifndef IO_RSRC_PRINTK_SIZE |
647 | #define IO_RSRC_PRINTK_SIZE 6 |
648 | #endif |
649 | |
650 | #ifndef MEM_RSRC_PRINTK_SIZE |
651 | #define MEM_RSRC_PRINTK_SIZE 10 |
652 | #endif |
653 | static const struct printf_spec io_spec = { |
654 | .base = 16, |
655 | .field_width = IO_RSRC_PRINTK_SIZE, |
656 | .precision = -1, |
657 | .flags = SPECIAL | SMALL | ZEROPAD, |
658 | }; |
659 | static const struct printf_spec mem_spec = { |
660 | .base = 16, |
661 | .field_width = MEM_RSRC_PRINTK_SIZE, |
662 | .precision = -1, |
663 | .flags = SPECIAL | SMALL | ZEROPAD, |
664 | }; |
665 | static const struct printf_spec bus_spec = { |
666 | .base = 16, |
667 | .field_width = 2, |
668 | .precision = -1, |
669 | .flags = SMALL | ZEROPAD, |
670 | }; |
671 | static const struct printf_spec dec_spec = { |
672 | .base = 10, |
673 | .precision = -1, |
674 | .flags = 0, |
675 | }; |
676 | static const struct printf_spec str_spec = { |
677 | .field_width = -1, |
678 | .precision = 10, |
679 | .flags = LEFT, |
680 | }; |
681 | static const struct printf_spec flag_spec = { |
682 | .base = 16, |
683 | .precision = -1, |
684 | .flags = SPECIAL | SMALL, |
685 | }; |
686 | |
687 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) |
688 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ |
689 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) |
690 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) |
691 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
692 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
693 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, |
694 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; |
695 | |
696 | char *p = sym, *pend = sym + sizeof(sym); |
697 | int decode = (fmt[0] == 'R') ? 1 : 0; |
698 | const struct printf_spec *specp; |
699 | |
700 | *p++ = '['; |
701 | if (res->flags & IORESOURCE_IO) { |
702 | p = string(p, pend, "io ", str_spec); |
703 | specp = &io_spec; |
704 | } else if (res->flags & IORESOURCE_MEM) { |
705 | p = string(p, pend, "mem ", str_spec); |
706 | specp = &mem_spec; |
707 | } else if (res->flags & IORESOURCE_IRQ) { |
708 | p = string(p, pend, "irq ", str_spec); |
709 | specp = &dec_spec; |
710 | } else if (res->flags & IORESOURCE_DMA) { |
711 | p = string(p, pend, "dma ", str_spec); |
712 | specp = &dec_spec; |
713 | } else if (res->flags & IORESOURCE_BUS) { |
714 | p = string(p, pend, "bus ", str_spec); |
715 | specp = &bus_spec; |
716 | } else { |
717 | p = string(p, pend, "??? ", str_spec); |
718 | specp = &mem_spec; |
719 | decode = 0; |
720 | } |
721 | if (decode && res->flags & IORESOURCE_UNSET) { |
722 | p = string(p, pend, "size ", str_spec); |
723 | p = number(p, pend, resource_size(res), *specp); |
724 | } else { |
725 | p = number(p, pend, res->start, *specp); |
726 | if (res->start != res->end) { |
727 | *p++ = '-'; |
728 | p = number(p, pend, res->end, *specp); |
729 | } |
730 | } |
731 | if (decode) { |
732 | if (res->flags & IORESOURCE_MEM_64) |
733 | p = string(p, pend, " 64bit", str_spec); |
734 | if (res->flags & IORESOURCE_PREFETCH) |
735 | p = string(p, pend, " pref", str_spec); |
736 | if (res->flags & IORESOURCE_WINDOW) |
737 | p = string(p, pend, " window", str_spec); |
738 | if (res->flags & IORESOURCE_DISABLED) |
739 | p = string(p, pend, " disabled", str_spec); |
740 | } else { |
741 | p = string(p, pend, " flags ", str_spec); |
742 | p = number(p, pend, res->flags, flag_spec); |
743 | } |
744 | *p++ = ']'; |
745 | *p = '\0'; |
746 | |
747 | return string(buf, end, sym, spec); |
748 | } |
749 | |
750 | static noinline_for_stack |
751 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, |
752 | const char *fmt) |
753 | { |
754 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
755 | negative value, fallback to the default */ |
756 | char separator; |
757 | |
758 | if (spec.field_width == 0) |
759 | /* nothing to print */ |
760 | return buf; |
761 | |
762 | if (ZERO_OR_NULL_PTR(addr)) |
763 | /* NULL pointer */ |
764 | return string(buf, end, NULL, spec); |
765 | |
766 | switch (fmt[1]) { |
767 | case 'C': |
768 | separator = ':'; |
769 | break; |
770 | case 'D': |
771 | separator = '-'; |
772 | break; |
773 | case 'N': |
774 | separator = 0; |
775 | break; |
776 | default: |
777 | separator = ' '; |
778 | break; |
779 | } |
780 | |
781 | if (spec.field_width > 0) |
782 | len = min_t(int, spec.field_width, 64); |
783 | |
784 | for (i = 0; i < len && buf < end - 1; i++) { |
785 | buf = hex_byte_pack(buf, addr[i]); |
786 | |
787 | if (buf < end && separator && i != len - 1) |
788 | *buf++ = separator; |
789 | } |
790 | |
791 | return buf; |
792 | } |
793 | |
794 | static noinline_for_stack |
795 | char *mac_address_string(char *buf, char *end, u8 *addr, |
796 | struct printf_spec spec, const char *fmt) |
797 | { |
798 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
799 | char *p = mac_addr; |
800 | int i; |
801 | char separator; |
802 | bool reversed = false; |
803 | |
804 | switch (fmt[1]) { |
805 | case 'F': |
806 | separator = '-'; |
807 | break; |
808 | |
809 | case 'R': |
810 | reversed = true; |
811 | /* fall through */ |
812 | |
813 | default: |
814 | separator = ':'; |
815 | break; |
816 | } |
817 | |
818 | for (i = 0; i < 6; i++) { |
819 | if (reversed) |
820 | p = hex_byte_pack(p, addr[5 - i]); |
821 | else |
822 | p = hex_byte_pack(p, addr[i]); |
823 | |
824 | if (fmt[0] == 'M' && i != 5) |
825 | *p++ = separator; |
826 | } |
827 | *p = '\0'; |
828 | |
829 | return string(buf, end, mac_addr, spec); |
830 | } |
831 | |
832 | static noinline_for_stack |
833 | char *ip4_string(char *p, const u8 *addr, const char *fmt) |
834 | { |
835 | int i; |
836 | bool leading_zeros = (fmt[0] == 'i'); |
837 | int index; |
838 | int step; |
839 | |
840 | switch (fmt[2]) { |
841 | case 'h': |
842 | #ifdef __BIG_ENDIAN |
843 | index = 0; |
844 | step = 1; |
845 | #else |
846 | index = 3; |
847 | step = -1; |
848 | #endif |
849 | break; |
850 | case 'l': |
851 | index = 3; |
852 | step = -1; |
853 | break; |
854 | case 'n': |
855 | case 'b': |
856 | default: |
857 | index = 0; |
858 | step = 1; |
859 | break; |
860 | } |
861 | for (i = 0; i < 4; i++) { |
862 | char temp[3]; /* hold each IP quad in reverse order */ |
863 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
864 | if (leading_zeros) { |
865 | if (digits < 3) |
866 | *p++ = '0'; |
867 | if (digits < 2) |
868 | *p++ = '0'; |
869 | } |
870 | /* reverse the digits in the quad */ |
871 | while (digits--) |
872 | *p++ = temp[digits]; |
873 | if (i < 3) |
874 | *p++ = '.'; |
875 | index += step; |
876 | } |
877 | *p = '\0'; |
878 | |
879 | return p; |
880 | } |
881 | |
882 | static noinline_for_stack |
883 | char *ip6_compressed_string(char *p, const char *addr) |
884 | { |
885 | int i, j, range; |
886 | unsigned char zerolength[8]; |
887 | int longest = 1; |
888 | int colonpos = -1; |
889 | u16 word; |
890 | u8 hi, lo; |
891 | bool needcolon = false; |
892 | bool useIPv4; |
893 | struct in6_addr in6; |
894 | |
895 | memcpy(&in6, addr, sizeof(struct in6_addr)); |
896 | |
897 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); |
898 | |
899 | memset(zerolength, 0, sizeof(zerolength)); |
900 | |
901 | if (useIPv4) |
902 | range = 6; |
903 | else |
904 | range = 8; |
905 | |
906 | /* find position of longest 0 run */ |
907 | for (i = 0; i < range; i++) { |
908 | for (j = i; j < range; j++) { |
909 | if (in6.s6_addr16[j] != 0) |
910 | break; |
911 | zerolength[i]++; |
912 | } |
913 | } |
914 | for (i = 0; i < range; i++) { |
915 | if (zerolength[i] > longest) { |
916 | longest = zerolength[i]; |
917 | colonpos = i; |
918 | } |
919 | } |
920 | if (longest == 1) /* don't compress a single 0 */ |
921 | colonpos = -1; |
922 | |
923 | /* emit address */ |
924 | for (i = 0; i < range; i++) { |
925 | if (i == colonpos) { |
926 | if (needcolon || i == 0) |
927 | *p++ = ':'; |
928 | *p++ = ':'; |
929 | needcolon = false; |
930 | i += longest - 1; |
931 | continue; |
932 | } |
933 | if (needcolon) { |
934 | *p++ = ':'; |
935 | needcolon = false; |
936 | } |
937 | /* hex u16 without leading 0s */ |
938 | word = ntohs(in6.s6_addr16[i]); |
939 | hi = word >> 8; |
940 | lo = word & 0xff; |
941 | if (hi) { |
942 | if (hi > 0x0f) |
943 | p = hex_byte_pack(p, hi); |
944 | else |
945 | *p++ = hex_asc_lo(hi); |
946 | p = hex_byte_pack(p, lo); |
947 | } |
948 | else if (lo > 0x0f) |
949 | p = hex_byte_pack(p, lo); |
950 | else |
951 | *p++ = hex_asc_lo(lo); |
952 | needcolon = true; |
953 | } |
954 | |
955 | if (useIPv4) { |
956 | if (needcolon) |
957 | *p++ = ':'; |
958 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
959 | } |
960 | *p = '\0'; |
961 | |
962 | return p; |
963 | } |
964 | |
965 | static noinline_for_stack |
966 | char *ip6_string(char *p, const char *addr, const char *fmt) |
967 | { |
968 | int i; |
969 | |
970 | for (i = 0; i < 8; i++) { |
971 | p = hex_byte_pack(p, *addr++); |
972 | p = hex_byte_pack(p, *addr++); |
973 | if (fmt[0] == 'I' && i != 7) |
974 | *p++ = ':'; |
975 | } |
976 | *p = '\0'; |
977 | |
978 | return p; |
979 | } |
980 | |
981 | static noinline_for_stack |
982 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, |
983 | struct printf_spec spec, const char *fmt) |
984 | { |
985 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; |
986 | |
987 | if (fmt[0] == 'I' && fmt[2] == 'c') |
988 | ip6_compressed_string(ip6_addr, addr); |
989 | else |
990 | ip6_string(ip6_addr, addr, fmt); |
991 | |
992 | return string(buf, end, ip6_addr, spec); |
993 | } |
994 | |
995 | static noinline_for_stack |
996 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
997 | struct printf_spec spec, const char *fmt) |
998 | { |
999 | char ip4_addr[sizeof("255.255.255.255")]; |
1000 | |
1001 | ip4_string(ip4_addr, addr, fmt); |
1002 | |
1003 | return string(buf, end, ip4_addr, spec); |
1004 | } |
1005 | |
1006 | static noinline_for_stack |
1007 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, |
1008 | struct printf_spec spec, const char *fmt) |
1009 | { |
1010 | bool have_p = false, have_s = false, have_f = false, have_c = false; |
1011 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + |
1012 | sizeof(":12345") + sizeof("/123456789") + |
1013 | sizeof("%1234567890")]; |
1014 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); |
1015 | const u8 *addr = (const u8 *) &sa->sin6_addr; |
1016 | char fmt6[2] = { fmt[0], '6' }; |
1017 | u8 off = 0; |
1018 | |
1019 | fmt++; |
1020 | while (isalpha(*++fmt)) { |
1021 | switch (*fmt) { |
1022 | case 'p': |
1023 | have_p = true; |
1024 | break; |
1025 | case 'f': |
1026 | have_f = true; |
1027 | break; |
1028 | case 's': |
1029 | have_s = true; |
1030 | break; |
1031 | case 'c': |
1032 | have_c = true; |
1033 | break; |
1034 | } |
1035 | } |
1036 | |
1037 | if (have_p || have_s || have_f) { |
1038 | *p = '['; |
1039 | off = 1; |
1040 | } |
1041 | |
1042 | if (fmt6[0] == 'I' && have_c) |
1043 | p = ip6_compressed_string(ip6_addr + off, addr); |
1044 | else |
1045 | p = ip6_string(ip6_addr + off, addr, fmt6); |
1046 | |
1047 | if (have_p || have_s || have_f) |
1048 | *p++ = ']'; |
1049 | |
1050 | if (have_p) { |
1051 | *p++ = ':'; |
1052 | p = number(p, pend, ntohs(sa->sin6_port), spec); |
1053 | } |
1054 | if (have_f) { |
1055 | *p++ = '/'; |
1056 | p = number(p, pend, ntohl(sa->sin6_flowinfo & |
1057 | IPV6_FLOWINFO_MASK), spec); |
1058 | } |
1059 | if (have_s) { |
1060 | *p++ = '%'; |
1061 | p = number(p, pend, sa->sin6_scope_id, spec); |
1062 | } |
1063 | *p = '\0'; |
1064 | |
1065 | return string(buf, end, ip6_addr, spec); |
1066 | } |
1067 | |
1068 | static noinline_for_stack |
1069 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, |
1070 | struct printf_spec spec, const char *fmt) |
1071 | { |
1072 | bool have_p = false; |
1073 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; |
1074 | char *pend = ip4_addr + sizeof(ip4_addr); |
1075 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; |
1076 | char fmt4[3] = { fmt[0], '4', 0 }; |
1077 | |
1078 | fmt++; |
1079 | while (isalpha(*++fmt)) { |
1080 | switch (*fmt) { |
1081 | case 'p': |
1082 | have_p = true; |
1083 | break; |
1084 | case 'h': |
1085 | case 'l': |
1086 | case 'n': |
1087 | case 'b': |
1088 | fmt4[2] = *fmt; |
1089 | break; |
1090 | } |
1091 | } |
1092 | |
1093 | p = ip4_string(ip4_addr, addr, fmt4); |
1094 | if (have_p) { |
1095 | *p++ = ':'; |
1096 | p = number(p, pend, ntohs(sa->sin_port), spec); |
1097 | } |
1098 | *p = '\0'; |
1099 | |
1100 | return string(buf, end, ip4_addr, spec); |
1101 | } |
1102 | |
1103 | static noinline_for_stack |
1104 | char *uuid_string(char *buf, char *end, const u8 *addr, |
1105 | struct printf_spec spec, const char *fmt) |
1106 | { |
1107 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; |
1108 | char *p = uuid; |
1109 | int i; |
1110 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; |
1111 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; |
1112 | const u8 *index = be; |
1113 | bool uc = false; |
1114 | |
1115 | switch (*(++fmt)) { |
1116 | case 'L': |
1117 | uc = true; /* fall-through */ |
1118 | case 'l': |
1119 | index = le; |
1120 | break; |
1121 | case 'B': |
1122 | uc = true; |
1123 | break; |
1124 | } |
1125 | |
1126 | for (i = 0; i < 16; i++) { |
1127 | p = hex_byte_pack(p, addr[index[i]]); |
1128 | switch (i) { |
1129 | case 3: |
1130 | case 5: |
1131 | case 7: |
1132 | case 9: |
1133 | *p++ = '-'; |
1134 | break; |
1135 | } |
1136 | } |
1137 | |
1138 | *p = 0; |
1139 | |
1140 | if (uc) { |
1141 | p = uuid; |
1142 | do { |
1143 | *p = toupper(*p); |
1144 | } while (*(++p)); |
1145 | } |
1146 | |
1147 | return string(buf, end, uuid, spec); |
1148 | } |
1149 | |
1150 | static |
1151 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, |
1152 | struct printf_spec spec) |
1153 | { |
1154 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
1155 | if (spec.field_width == -1) |
1156 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); |
1157 | spec.base = 16; |
1158 | |
1159 | return number(buf, end, *(const netdev_features_t *)addr, spec); |
1160 | } |
1161 | |
1162 | static noinline_for_stack |
1163 | char *address_val(char *buf, char *end, const void *addr, |
1164 | struct printf_spec spec, const char *fmt) |
1165 | { |
1166 | unsigned long long num; |
1167 | |
1168 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
1169 | spec.base = 16; |
1170 | |
1171 | switch (fmt[1]) { |
1172 | case 'd': |
1173 | num = *(const dma_addr_t *)addr; |
1174 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; |
1175 | break; |
1176 | case 'p': |
1177 | default: |
1178 | num = *(const phys_addr_t *)addr; |
1179 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; |
1180 | break; |
1181 | } |
1182 | |
1183 | return number(buf, end, num, spec); |
1184 | } |
1185 | |
1186 | int kptr_restrict __read_mostly; |
1187 | |
1188 | /* |
1189 | * Show a '%p' thing. A kernel extension is that the '%p' is followed |
1190 | * by an extra set of alphanumeric characters that are extended format |
1191 | * specifiers. |
1192 | * |
1193 | * Right now we handle: |
1194 | * |
1195 | * - 'F' For symbolic function descriptor pointers with offset |
1196 | * - 'f' For simple symbolic function names without offset |
1197 | * - 'S' For symbolic direct pointers with offset |
1198 | * - 's' For symbolic direct pointers without offset |
1199 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
1200 | * - 'B' For backtraced symbolic direct pointers with offset |
1201 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1202 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] |
1203 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1204 | * usual colon-separated hex notation |
1205 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
1206 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
1207 | * with a dash-separated hex notation |
1208 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
1209 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1210 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) |
1211 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's |
1212 | * [S][pfs] |
1213 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to |
1214 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] |
1215 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1216 | * IPv6 omits the colons (01020304...0f) |
1217 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) |
1218 | * [S][pfs] |
1219 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to |
1220 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] |
1221 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order |
1222 | * - 'I[6S]c' for IPv6 addresses printed as specified by |
1223 | * http://tools.ietf.org/html/rfc5952 |
1224 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1225 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" |
1226 | * Options for %pU are: |
1227 | * b big endian lower case hex (default) |
1228 | * B big endian UPPER case hex |
1229 | * l little endian lower case hex |
1230 | * L little endian UPPER case hex |
1231 | * big endian output byte order is: |
1232 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] |
1233 | * little endian output byte order is: |
1234 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] |
1235 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1236 | * call vsnprintf(->format, *->va_list). |
1237 | * Implements a "recursive vsnprintf". |
1238 | * Do not use this feature without some mechanism to verify the |
1239 | * correctness of the format string and va_list arguments. |
1240 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
1241 | * - 'NF' For a netdev_features_t |
1242 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1243 | * a certain separator (' ' by default): |
1244 | * C colon |
1245 | * D dash |
1246 | * N no separator |
1247 | * The maximum supported length is 64 bytes of the input. Consider |
1248 | * to use print_hex_dump() for the larger input. |
1249 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1250 | * (default assumed to be phys_addr_t, passed by reference) |
1251 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1252 | * - 'D[234]' Same as 'd' but for a struct file |
1253 | * |
1254 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1255 | * function pointers are really function descriptors, which contain a |
1256 | * pointer to the real address. |
1257 | */ |
1258 | static noinline_for_stack |
1259 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
1260 | struct printf_spec spec) |
1261 | { |
1262 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); |
1263 | |
1264 | if (!ptr && *fmt != 'K') { |
1265 | /* |
1266 | * Print (null) with the same width as a pointer so it makes |
1267 | * tabular output look nice. |
1268 | */ |
1269 | if (spec.field_width == -1) |
1270 | spec.field_width = default_width; |
1271 | return string(buf, end, "(null)", spec); |
1272 | } |
1273 | |
1274 | switch (*fmt) { |
1275 | case 'F': |
1276 | case 'f': |
1277 | ptr = dereference_function_descriptor(ptr); |
1278 | /* Fallthrough */ |
1279 | case 'S': |
1280 | case 's': |
1281 | case 'B': |
1282 | return symbol_string(buf, end, ptr, spec, fmt); |
1283 | case 'R': |
1284 | case 'r': |
1285 | return resource_string(buf, end, ptr, spec, fmt); |
1286 | case 'h': |
1287 | return hex_string(buf, end, ptr, spec, fmt); |
1288 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1289 | case 'm': /* Contiguous: 000102030405 */ |
1290 | /* [mM]F (FDDI) */ |
1291 | /* [mM]R (Reverse order; Bluetooth) */ |
1292 | return mac_address_string(buf, end, ptr, spec, fmt); |
1293 | case 'I': /* Formatted IP supported |
1294 | * 4: 1.2.3.4 |
1295 | * 6: 0001:0203:...:0708 |
1296 | * 6c: 1::708 or 1::1.2.3.4 |
1297 | */ |
1298 | case 'i': /* Contiguous: |
1299 | * 4: 001.002.003.004 |
1300 | * 6: 000102...0f |
1301 | */ |
1302 | switch (fmt[1]) { |
1303 | case '6': |
1304 | return ip6_addr_string(buf, end, ptr, spec, fmt); |
1305 | case '4': |
1306 | return ip4_addr_string(buf, end, ptr, spec, fmt); |
1307 | case 'S': { |
1308 | const union { |
1309 | struct sockaddr raw; |
1310 | struct sockaddr_in v4; |
1311 | struct sockaddr_in6 v6; |
1312 | } *sa = ptr; |
1313 | |
1314 | switch (sa->raw.sa_family) { |
1315 | case AF_INET: |
1316 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); |
1317 | case AF_INET6: |
1318 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); |
1319 | default: |
1320 | return string(buf, end, "(invalid address)", spec); |
1321 | }} |
1322 | } |
1323 | break; |
1324 | case 'U': |
1325 | return uuid_string(buf, end, ptr, spec, fmt); |
1326 | case 'V': |
1327 | { |
1328 | va_list va; |
1329 | |
1330 | va_copy(va, *((struct va_format *)ptr)->va); |
1331 | buf += vsnprintf(buf, end > buf ? end - buf : 0, |
1332 | ((struct va_format *)ptr)->fmt, va); |
1333 | va_end(va); |
1334 | return buf; |
1335 | } |
1336 | case 'K': |
1337 | /* |
1338 | * %pK cannot be used in IRQ context because its test |
1339 | * for CAP_SYSLOG would be meaningless. |
1340 | */ |
1341 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1342 | in_nmi())) { |
1343 | if (spec.field_width == -1) |
1344 | spec.field_width = default_width; |
1345 | return string(buf, end, "pK-error", spec); |
1346 | } |
1347 | |
1348 | switch (kptr_restrict) { |
1349 | case 0: |
1350 | /* Always print %pK values */ |
1351 | break; |
1352 | case 1: { |
1353 | /* |
1354 | * Only print the real pointer value if the current |
1355 | * process has CAP_SYSLOG and is running with the |
1356 | * same credentials it started with. This is because |
1357 | * access to files is checked at open() time, but %pK |
1358 | * checks permission at read() time. We don't want to |
1359 | * leak pointer values if a binary opens a file using |
1360 | * %pK and then elevates privileges before reading it. |
1361 | */ |
1362 | const struct cred *cred = current_cred(); |
1363 | |
1364 | if (!has_capability_noaudit(current, CAP_SYSLOG) || |
1365 | !uid_eq(cred->euid, cred->uid) || |
1366 | !gid_eq(cred->egid, cred->gid)) |
1367 | ptr = NULL; |
1368 | break; |
1369 | } |
1370 | case 2: |
1371 | default: |
1372 | /* Always print 0's for %pK */ |
1373 | ptr = NULL; |
1374 | break; |
1375 | } |
1376 | break; |
1377 | |
1378 | case 'N': |
1379 | switch (fmt[1]) { |
1380 | case 'F': |
1381 | return netdev_feature_string(buf, end, ptr, spec); |
1382 | } |
1383 | break; |
1384 | case 'a': |
1385 | return address_val(buf, end, ptr, spec, fmt); |
1386 | case 'd': |
1387 | return dentry_name(buf, end, ptr, spec, fmt); |
1388 | case 'D': |
1389 | return dentry_name(buf, end, |
1390 | ((const struct file *)ptr)->f_path.dentry, |
1391 | spec, fmt); |
1392 | } |
1393 | spec.flags |= SMALL; |
1394 | if (spec.field_width == -1) { |
1395 | spec.field_width = default_width; |
1396 | spec.flags |= ZEROPAD; |
1397 | } |
1398 | spec.base = 16; |
1399 | |
1400 | return number(buf, end, (unsigned long) ptr, spec); |
1401 | } |
1402 | |
1403 | /* |
1404 | * Helper function to decode printf style format. |
1405 | * Each call decode a token from the format and return the |
1406 | * number of characters read (or likely the delta where it wants |
1407 | * to go on the next call). |
1408 | * The decoded token is returned through the parameters |
1409 | * |
1410 | * 'h', 'l', or 'L' for integer fields |
1411 | * 'z' support added 23/7/1999 S.H. |
1412 | * 'z' changed to 'Z' --davidm 1/25/99 |
1413 | * 't' added for ptrdiff_t |
1414 | * |
1415 | * @fmt: the format string |
1416 | * @type of the token returned |
1417 | * @flags: various flags such as +, -, # tokens.. |
1418 | * @field_width: overwritten width |
1419 | * @base: base of the number (octal, hex, ...) |
1420 | * @precision: precision of a number |
1421 | * @qualifier: qualifier of a number (long, size_t, ...) |
1422 | */ |
1423 | static noinline_for_stack |
1424 | int format_decode(const char *fmt, struct printf_spec *spec) |
1425 | { |
1426 | const char *start = fmt; |
1427 | |
1428 | /* we finished early by reading the field width */ |
1429 | if (spec->type == FORMAT_TYPE_WIDTH) { |
1430 | if (spec->field_width < 0) { |
1431 | spec->field_width = -spec->field_width; |
1432 | spec->flags |= LEFT; |
1433 | } |
1434 | spec->type = FORMAT_TYPE_NONE; |
1435 | goto precision; |
1436 | } |
1437 | |
1438 | /* we finished early by reading the precision */ |
1439 | if (spec->type == FORMAT_TYPE_PRECISION) { |
1440 | if (spec->precision < 0) |
1441 | spec->precision = 0; |
1442 | |
1443 | spec->type = FORMAT_TYPE_NONE; |
1444 | goto qualifier; |
1445 | } |
1446 | |
1447 | /* By default */ |
1448 | spec->type = FORMAT_TYPE_NONE; |
1449 | |
1450 | for (; *fmt ; ++fmt) { |
1451 | if (*fmt == '%') |
1452 | break; |
1453 | } |
1454 | |
1455 | /* Return the current non-format string */ |
1456 | if (fmt != start || !*fmt) |
1457 | return fmt - start; |
1458 | |
1459 | /* Process flags */ |
1460 | spec->flags = 0; |
1461 | |
1462 | while (1) { /* this also skips first '%' */ |
1463 | bool found = true; |
1464 | |
1465 | ++fmt; |
1466 | |
1467 | switch (*fmt) { |
1468 | case '-': spec->flags |= LEFT; break; |
1469 | case '+': spec->flags |= PLUS; break; |
1470 | case ' ': spec->flags |= SPACE; break; |
1471 | case '#': spec->flags |= SPECIAL; break; |
1472 | case '0': spec->flags |= ZEROPAD; break; |
1473 | default: found = false; |
1474 | } |
1475 | |
1476 | if (!found) |
1477 | break; |
1478 | } |
1479 | |
1480 | /* get field width */ |
1481 | spec->field_width = -1; |
1482 | |
1483 | if (isdigit(*fmt)) |
1484 | spec->field_width = skip_atoi(&fmt); |
1485 | else if (*fmt == '*') { |
1486 | /* it's the next argument */ |
1487 | spec->type = FORMAT_TYPE_WIDTH; |
1488 | return ++fmt - start; |
1489 | } |
1490 | |
1491 | precision: |
1492 | /* get the precision */ |
1493 | spec->precision = -1; |
1494 | if (*fmt == '.') { |
1495 | ++fmt; |
1496 | if (isdigit(*fmt)) { |
1497 | spec->precision = skip_atoi(&fmt); |
1498 | if (spec->precision < 0) |
1499 | spec->precision = 0; |
1500 | } else if (*fmt == '*') { |
1501 | /* it's the next argument */ |
1502 | spec->type = FORMAT_TYPE_PRECISION; |
1503 | return ++fmt - start; |
1504 | } |
1505 | } |
1506 | |
1507 | qualifier: |
1508 | /* get the conversion qualifier */ |
1509 | spec->qualifier = -1; |
1510 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1511 | _tolower(*fmt) == 'z' || *fmt == 't') { |
1512 | spec->qualifier = *fmt++; |
1513 | if (unlikely(spec->qualifier == *fmt)) { |
1514 | if (spec->qualifier == 'l') { |
1515 | spec->qualifier = 'L'; |
1516 | ++fmt; |
1517 | } else if (spec->qualifier == 'h') { |
1518 | spec->qualifier = 'H'; |
1519 | ++fmt; |
1520 | } |
1521 | } |
1522 | } |
1523 | |
1524 | /* default base */ |
1525 | spec->base = 10; |
1526 | switch (*fmt) { |
1527 | case 'c': |
1528 | spec->type = FORMAT_TYPE_CHAR; |
1529 | return ++fmt - start; |
1530 | |
1531 | case 's': |
1532 | spec->type = FORMAT_TYPE_STR; |
1533 | return ++fmt - start; |
1534 | |
1535 | case 'p': |
1536 | spec->type = FORMAT_TYPE_PTR; |
1537 | return fmt - start; |
1538 | /* skip alnum */ |
1539 | |
1540 | case '%': |
1541 | spec->type = FORMAT_TYPE_PERCENT_CHAR; |
1542 | return ++fmt - start; |
1543 | |
1544 | /* integer number formats - set up the flags and "break" */ |
1545 | case 'o': |
1546 | spec->base = 8; |
1547 | break; |
1548 | |
1549 | case 'x': |
1550 | spec->flags |= SMALL; |
1551 | |
1552 | case 'X': |
1553 | spec->base = 16; |
1554 | break; |
1555 | |
1556 | case 'd': |
1557 | case 'i': |
1558 | spec->flags |= SIGN; |
1559 | case 'u': |
1560 | break; |
1561 | |
1562 | case 'n': |
1563 | /* |
1564 | * Since %n poses a greater security risk than utility, treat |
1565 | * it as an invalid format specifier. Warn about its use so |
1566 | * that new instances don't get added. |
1567 | */ |
1568 | WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt); |
1569 | /* Fall-through */ |
1570 | |
1571 | default: |
1572 | spec->type = FORMAT_TYPE_INVALID; |
1573 | return fmt - start; |
1574 | } |
1575 | |
1576 | if (spec->qualifier == 'L') |
1577 | spec->type = FORMAT_TYPE_LONG_LONG; |
1578 | else if (spec->qualifier == 'l') { |
1579 | if (spec->flags & SIGN) |
1580 | spec->type = FORMAT_TYPE_LONG; |
1581 | else |
1582 | spec->type = FORMAT_TYPE_ULONG; |
1583 | } else if (_tolower(spec->qualifier) == 'z') { |
1584 | spec->type = FORMAT_TYPE_SIZE_T; |
1585 | } else if (spec->qualifier == 't') { |
1586 | spec->type = FORMAT_TYPE_PTRDIFF; |
1587 | } else if (spec->qualifier == 'H') { |
1588 | if (spec->flags & SIGN) |
1589 | spec->type = FORMAT_TYPE_BYTE; |
1590 | else |
1591 | spec->type = FORMAT_TYPE_UBYTE; |
1592 | } else if (spec->qualifier == 'h') { |
1593 | if (spec->flags & SIGN) |
1594 | spec->type = FORMAT_TYPE_SHORT; |
1595 | else |
1596 | spec->type = FORMAT_TYPE_USHORT; |
1597 | } else { |
1598 | if (spec->flags & SIGN) |
1599 | spec->type = FORMAT_TYPE_INT; |
1600 | else |
1601 | spec->type = FORMAT_TYPE_UINT; |
1602 | } |
1603 | |
1604 | return ++fmt - start; |
1605 | } |
1606 | |
1607 | /** |
1608 | * vsnprintf - Format a string and place it in a buffer |
1609 | * @buf: The buffer to place the result into |
1610 | * @size: The size of the buffer, including the trailing null space |
1611 | * @fmt: The format string to use |
1612 | * @args: Arguments for the format string |
1613 | * |
1614 | * This function follows C99 vsnprintf, but has some extensions: |
1615 | * %pS output the name of a text symbol with offset |
1616 | * %ps output the name of a text symbol without offset |
1617 | * %pF output the name of a function pointer with its offset |
1618 | * %pf output the name of a function pointer without its offset |
1619 | * %pB output the name of a backtrace symbol with its offset |
1620 | * %pR output the address range in a struct resource with decoded flags |
1621 | * %pr output the address range in a struct resource with raw flags |
1622 | * %pM output a 6-byte MAC address with colons |
1623 | * %pMR output a 6-byte MAC address with colons in reversed order |
1624 | * %pMF output a 6-byte MAC address with dashes |
1625 | * %pm output a 6-byte MAC address without colons |
1626 | * %pmR output a 6-byte MAC address without colons in reversed order |
1627 | * %pI4 print an IPv4 address without leading zeros |
1628 | * %pi4 print an IPv4 address with leading zeros |
1629 | * %pI6 print an IPv6 address with colons |
1630 | * %pi6 print an IPv6 address without colons |
1631 | * %pI6c print an IPv6 address as specified by RFC 5952 |
1632 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address |
1633 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address |
1634 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1635 | * case. |
1636 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 |
1637 | * bytes of the input) |
1638 | * %n is ignored |
1639 | * |
1640 | * ** Please update Documentation/printk-formats.txt when making changes ** |
1641 | * |
1642 | * The return value is the number of characters which would |
1643 | * be generated for the given input, excluding the trailing |
1644 | * '\0', as per ISO C99. If you want to have the exact |
1645 | * number of characters written into @buf as return value |
1646 | * (not including the trailing '\0'), use vscnprintf(). If the |
1647 | * return is greater than or equal to @size, the resulting |
1648 | * string is truncated. |
1649 | * |
1650 | * If you're not already dealing with a va_list consider using snprintf(). |
1651 | */ |
1652 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
1653 | { |
1654 | unsigned long long num; |
1655 | char *str, *end; |
1656 | struct printf_spec spec = {0}; |
1657 | |
1658 | /* Reject out-of-range values early. Large positive sizes are |
1659 | used for unknown buffer sizes. */ |
1660 | if (WARN_ON_ONCE((int) size < 0)) |
1661 | return 0; |
1662 | |
1663 | str = buf; |
1664 | end = buf + size; |
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 = va_arg(args, int); |
1692 | break; |
1693 | |
1694 | case FORMAT_TYPE_PRECISION: |
1695 | spec.precision = va_arg(args, 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 | } |
1709 | c = (unsigned char) va_arg(args, int); |
1710 | if (str < end) |
1711 | *str = c; |
1712 | ++str; |
1713 | while (--spec.field_width > 0) { |
1714 | if (str < end) |
1715 | *str = ' '; |
1716 | ++str; |
1717 | } |
1718 | break; |
1719 | } |
1720 | |
1721 | case FORMAT_TYPE_STR: |
1722 | str = string(str, end, va_arg(args, char *), spec); |
1723 | break; |
1724 | |
1725 | case FORMAT_TYPE_PTR: |
1726 | str = pointer(fmt+1, str, end, va_arg(args, void *), |
1727 | spec); |
1728 | while (isalnum(*fmt)) |
1729 | fmt++; |
1730 | break; |
1731 | |
1732 | case FORMAT_TYPE_PERCENT_CHAR: |
1733 | if (str < end) |
1734 | *str = '%'; |
1735 | ++str; |
1736 | break; |
1737 | |
1738 | case FORMAT_TYPE_INVALID: |
1739 | if (str < end) |
1740 | *str = '%'; |
1741 | ++str; |
1742 | break; |
1743 | |
1744 | default: |
1745 | switch (spec.type) { |
1746 | case FORMAT_TYPE_LONG_LONG: |
1747 | num = va_arg(args, long long); |
1748 | break; |
1749 | case FORMAT_TYPE_ULONG: |
1750 | num = va_arg(args, unsigned long); |
1751 | break; |
1752 | case FORMAT_TYPE_LONG: |
1753 | num = va_arg(args, long); |
1754 | break; |
1755 | case FORMAT_TYPE_SIZE_T: |
1756 | if (spec.flags & SIGN) |
1757 | num = va_arg(args, ssize_t); |
1758 | else |
1759 | num = va_arg(args, size_t); |
1760 | break; |
1761 | case FORMAT_TYPE_PTRDIFF: |
1762 | num = va_arg(args, ptrdiff_t); |
1763 | break; |
1764 | case FORMAT_TYPE_UBYTE: |
1765 | num = (unsigned char) va_arg(args, int); |
1766 | break; |
1767 | case FORMAT_TYPE_BYTE: |
1768 | num = (signed char) va_arg(args, int); |
1769 | break; |
1770 | case FORMAT_TYPE_USHORT: |
1771 | num = (unsigned short) va_arg(args, int); |
1772 | break; |
1773 | case FORMAT_TYPE_SHORT: |
1774 | num = (short) va_arg(args, int); |
1775 | break; |
1776 | case FORMAT_TYPE_INT: |
1777 | num = (int) va_arg(args, int); |
1778 | break; |
1779 | default: |
1780 | num = va_arg(args, unsigned int); |
1781 | } |
1782 | |
1783 | str = number(str, end, num, spec); |
1784 | } |
1785 | } |
1786 | |
1787 | if (size > 0) { |
1788 | if (str < end) |
1789 | *str = '\0'; |
1790 | else |
1791 | end[-1] = '\0'; |
1792 | } |
1793 | |
1794 | /* the trailing null byte doesn't count towards the total */ |
1795 | return str-buf; |
1796 | |
1797 | } |
1798 | EXPORT_SYMBOL(vsnprintf); |
1799 | |
1800 | /** |
1801 | * vscnprintf - Format a string and place it in a buffer |
1802 | * @buf: The buffer to place the result into |
1803 | * @size: The size of the buffer, including the trailing null space |
1804 | * @fmt: The format string to use |
1805 | * @args: Arguments for the format string |
1806 | * |
1807 | * The return value is the number of characters which have been written into |
1808 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1809 | * returns 0. |
1810 | * |
1811 | * If you're not already dealing with a va_list consider using scnprintf(). |
1812 | * |
1813 | * See the vsnprintf() documentation for format string extensions over C99. |
1814 | */ |
1815 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
1816 | { |
1817 | int i; |
1818 | |
1819 | i = vsnprintf(buf, size, fmt, args); |
1820 | |
1821 | if (likely(i < size)) |
1822 | return i; |
1823 | if (size != 0) |
1824 | return size - 1; |
1825 | return 0; |
1826 | } |
1827 | EXPORT_SYMBOL(vscnprintf); |
1828 | |
1829 | /** |
1830 | * snprintf - Format a string and place it in a buffer |
1831 | * @buf: The buffer to place the result into |
1832 | * @size: The size of the buffer, including the trailing null space |
1833 | * @fmt: The format string to use |
1834 | * @...: Arguments for the format string |
1835 | * |
1836 | * The return value is the number of characters which would be |
1837 | * generated for the given input, excluding the trailing null, |
1838 | * as per ISO C99. If the return is greater than or equal to |
1839 | * @size, the resulting string is truncated. |
1840 | * |
1841 | * See the vsnprintf() documentation for format string extensions over C99. |
1842 | */ |
1843 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1844 | { |
1845 | va_list args; |
1846 | int i; |
1847 | |
1848 | va_start(args, fmt); |
1849 | i = vsnprintf(buf, size, fmt, args); |
1850 | va_end(args); |
1851 | |
1852 | return i; |
1853 | } |
1854 | EXPORT_SYMBOL(snprintf); |
1855 | |
1856 | /** |
1857 | * scnprintf - Format a string and place it in a buffer |
1858 | * @buf: The buffer to place the result into |
1859 | * @size: The size of the buffer, including the trailing null space |
1860 | * @fmt: The format string to use |
1861 | * @...: Arguments for the format string |
1862 | * |
1863 | * The return value is the number of characters written into @buf not including |
1864 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1865 | */ |
1866 | |
1867 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1868 | { |
1869 | va_list args; |
1870 | int i; |
1871 | |
1872 | va_start(args, fmt); |
1873 | i = vscnprintf(buf, size, fmt, args); |
1874 | va_end(args); |
1875 | |
1876 | return i; |
1877 | } |
1878 | EXPORT_SYMBOL(scnprintf); |
1879 | |
1880 | /** |
1881 | * vsprintf - Format a string and place it in a buffer |
1882 | * @buf: The buffer to place the result into |
1883 | * @fmt: The format string to use |
1884 | * @args: Arguments for the format string |
1885 | * |
1886 | * The function returns the number of characters written |
1887 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1888 | * buffer overflows. |
1889 | * |
1890 | * If you're not already dealing with a va_list consider using sprintf(). |
1891 | * |
1892 | * See the vsnprintf() documentation for format string extensions over C99. |
1893 | */ |
1894 | int vsprintf(char *buf, const char *fmt, va_list args) |
1895 | { |
1896 | return vsnprintf(buf, INT_MAX, fmt, args); |
1897 | } |
1898 | EXPORT_SYMBOL(vsprintf); |
1899 | |
1900 | /** |
1901 | * sprintf - Format a string and place it in a buffer |
1902 | * @buf: The buffer to place the result into |
1903 | * @fmt: The format string to use |
1904 | * @...: Arguments for the format string |
1905 | * |
1906 | * The function returns the number of characters written |
1907 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1908 | * buffer overflows. |
1909 | * |
1910 | * See the vsnprintf() documentation for format string extensions over C99. |
1911 | */ |
1912 | int sprintf(char *buf, const char *fmt, ...) |
1913 | { |
1914 | va_list args; |
1915 | int i; |
1916 | |
1917 | va_start(args, fmt); |
1918 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1919 | va_end(args); |
1920 | |
1921 | return i; |
1922 | } |
1923 | EXPORT_SYMBOL(sprintf); |
1924 | |
1925 | #ifdef CONFIG_BINARY_PRINTF |
1926 | /* |
1927 | * bprintf service: |
1928 | * vbin_printf() - VA arguments to binary data |
1929 | * bstr_printf() - Binary data to text string |
1930 | */ |
1931 | |
1932 | /** |
1933 | * vbin_printf - Parse a format string and place args' binary value in a buffer |
1934 | * @bin_buf: The buffer to place args' binary value |
1935 | * @size: The size of the buffer(by words(32bits), not characters) |
1936 | * @fmt: The format string to use |
1937 | * @args: Arguments for the format string |
1938 | * |
1939 | * The format follows C99 vsnprintf, except %n is ignored, and its argument |
1940 | * is skiped. |
1941 | * |
1942 | * The return value is the number of words(32bits) which would be generated for |
1943 | * the given input. |
1944 | * |
1945 | * NOTE: |
1946 | * If the return value is greater than @size, the resulting bin_buf is NOT |
1947 | * valid for bstr_printf(). |
1948 | */ |
1949 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) |
1950 | { |
1951 | struct printf_spec spec = {0}; |
1952 | char *str, *end; |
1953 | |
1954 | str = (char *)bin_buf; |
1955 | end = (char *)(bin_buf + size); |
1956 | |
1957 | #define save_arg(type) \ |
1958 | do { \ |
1959 | if (sizeof(type) == 8) { \ |
1960 | unsigned long long value; \ |
1961 | str = PTR_ALIGN(str, sizeof(u32)); \ |
1962 | value = va_arg(args, unsigned long long); \ |
1963 | if (str + sizeof(type) <= end) { \ |
1964 | *(u32 *)str = *(u32 *)&value; \ |
1965 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ |
1966 | } \ |
1967 | } else { \ |
1968 | unsigned long value; \ |
1969 | str = PTR_ALIGN(str, sizeof(type)); \ |
1970 | value = va_arg(args, int); \ |
1971 | if (str + sizeof(type) <= end) \ |
1972 | *(typeof(type) *)str = (type)value; \ |
1973 | } \ |
1974 | str += sizeof(type); \ |
1975 | } while (0) |
1976 | |
1977 | while (*fmt) { |
1978 | int read = format_decode(fmt, &spec); |
1979 | |
1980 | fmt += read; |
1981 | |
1982 | switch (spec.type) { |
1983 | case FORMAT_TYPE_NONE: |
1984 | case FORMAT_TYPE_INVALID: |
1985 | case FORMAT_TYPE_PERCENT_CHAR: |
1986 | break; |
1987 | |
1988 | case FORMAT_TYPE_WIDTH: |
1989 | case FORMAT_TYPE_PRECISION: |
1990 | save_arg(int); |
1991 | break; |
1992 | |
1993 | case FORMAT_TYPE_CHAR: |
1994 | save_arg(char); |
1995 | break; |
1996 | |
1997 | case FORMAT_TYPE_STR: { |
1998 | const char *save_str = va_arg(args, char *); |
1999 | size_t len; |
2000 | |
2001 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2002 | || (unsigned long)save_str < PAGE_SIZE) |
2003 | save_str = "(null)"; |
2004 | len = strlen(save_str) + 1; |
2005 | if (str + len < end) |
2006 | memcpy(str, save_str, len); |
2007 | str += len; |
2008 | break; |
2009 | } |
2010 | |
2011 | case FORMAT_TYPE_PTR: |
2012 | save_arg(void *); |
2013 | /* skip all alphanumeric pointer suffixes */ |
2014 | while (isalnum(*fmt)) |
2015 | fmt++; |
2016 | break; |
2017 | |
2018 | default: |
2019 | switch (spec.type) { |
2020 | |
2021 | case FORMAT_TYPE_LONG_LONG: |
2022 | save_arg(long long); |
2023 | break; |
2024 | case FORMAT_TYPE_ULONG: |
2025 | case FORMAT_TYPE_LONG: |
2026 | save_arg(unsigned long); |
2027 | break; |
2028 | case FORMAT_TYPE_SIZE_T: |
2029 | save_arg(size_t); |
2030 | break; |
2031 | case FORMAT_TYPE_PTRDIFF: |
2032 | save_arg(ptrdiff_t); |
2033 | break; |
2034 | case FORMAT_TYPE_UBYTE: |
2035 | case FORMAT_TYPE_BYTE: |
2036 | save_arg(char); |
2037 | break; |
2038 | case FORMAT_TYPE_USHORT: |
2039 | case FORMAT_TYPE_SHORT: |
2040 | save_arg(short); |
2041 | break; |
2042 | default: |
2043 | save_arg(int); |
2044 | } |
2045 | } |
2046 | } |
2047 | |
2048 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
2049 | #undef save_arg |
2050 | } |
2051 | EXPORT_SYMBOL_GPL(vbin_printf); |
2052 | |
2053 | /** |
2054 | * bstr_printf - Format a string from binary arguments and place it in a buffer |
2055 | * @buf: The buffer to place the result into |
2056 | * @size: The size of the buffer, including the trailing null space |
2057 | * @fmt: The format string to use |
2058 | * @bin_buf: Binary arguments for the format string |
2059 | * |
2060 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets |
2061 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is |
2062 | * a binary buffer that generated by vbin_printf. |
2063 | * |
2064 | * The format follows C99 vsnprintf, but has some extensions: |
2065 | * see vsnprintf comment for details. |
2066 | * |
2067 | * The return value is the number of characters which would |
2068 | * be generated for the given input, excluding the trailing |
2069 | * '\0', as per ISO C99. If you want to have the exact |
2070 | * number of characters written into @buf as return value |
2071 | * (not including the trailing '\0'), use vscnprintf(). If the |
2072 | * return is greater than or equal to @size, the resulting |
2073 | * string is truncated. |
2074 | */ |
2075 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) |
2076 | { |
2077 | struct printf_spec spec = {0}; |
2078 | char *str, *end; |
2079 | const char *args = (const char *)bin_buf; |
2080 | |
2081 | if (WARN_ON_ONCE((int) size < 0)) |
2082 | return 0; |
2083 | |
2084 | str = buf; |
2085 | end = buf + size; |
2086 | |
2087 | #define get_arg(type) \ |
2088 | ({ \ |
2089 | typeof(type) value; \ |
2090 | if (sizeof(type) == 8) { \ |
2091 | args = PTR_ALIGN(args, sizeof(u32)); \ |
2092 | *(u32 *)&value = *(u32 *)args; \ |
2093 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ |
2094 | } else { \ |
2095 | args = PTR_ALIGN(args, sizeof(type)); \ |
2096 | value = *(typeof(type) *)args; \ |
2097 | } \ |
2098 | args += sizeof(type); \ |
2099 | value; \ |
2100 | }) |
2101 | |
2102 | /* Make sure end is always >= buf */ |
2103 | if (end < buf) { |
2104 | end = ((void *)-1); |
2105 | size = end - buf; |
2106 | } |
2107 | |
2108 | while (*fmt) { |
2109 | const char *old_fmt = fmt; |
2110 | int read = format_decode(fmt, &spec); |
2111 | |
2112 | fmt += read; |
2113 | |
2114 | switch (spec.type) { |
2115 | case FORMAT_TYPE_NONE: { |
2116 | int copy = read; |
2117 | if (str < end) { |
2118 | if (copy > end - str) |
2119 | copy = end - str; |
2120 | memcpy(str, old_fmt, copy); |
2121 | } |
2122 | str += read; |
2123 | break; |
2124 | } |
2125 | |
2126 | case FORMAT_TYPE_WIDTH: |
2127 | spec.field_width = get_arg(int); |
2128 | break; |
2129 | |
2130 | case FORMAT_TYPE_PRECISION: |
2131 | spec.precision = get_arg(int); |
2132 | break; |
2133 | |
2134 | case FORMAT_TYPE_CHAR: { |
2135 | char c; |
2136 | |
2137 | if (!(spec.flags & LEFT)) { |
2138 | while (--spec.field_width > 0) { |
2139 | if (str < end) |
2140 | *str = ' '; |
2141 | ++str; |
2142 | } |
2143 | } |
2144 | c = (unsigned char) get_arg(char); |
2145 | if (str < end) |
2146 | *str = c; |
2147 | ++str; |
2148 | while (--spec.field_width > 0) { |
2149 | if (str < end) |
2150 | *str = ' '; |
2151 | ++str; |
2152 | } |
2153 | break; |
2154 | } |
2155 | |
2156 | case FORMAT_TYPE_STR: { |
2157 | const char *str_arg = args; |
2158 | args += strlen(str_arg) + 1; |
2159 | str = string(str, end, (char *)str_arg, spec); |
2160 | break; |
2161 | } |
2162 | |
2163 | case FORMAT_TYPE_PTR: |
2164 | str = pointer(fmt+1, str, end, get_arg(void *), spec); |
2165 | while (isalnum(*fmt)) |
2166 | fmt++; |
2167 | break; |
2168 | |
2169 | case FORMAT_TYPE_PERCENT_CHAR: |
2170 | case FORMAT_TYPE_INVALID: |
2171 | if (str < end) |
2172 | *str = '%'; |
2173 | ++str; |
2174 | break; |
2175 | |
2176 | default: { |
2177 | unsigned long long num; |
2178 | |
2179 | switch (spec.type) { |
2180 | |
2181 | case FORMAT_TYPE_LONG_LONG: |
2182 | num = get_arg(long long); |
2183 | break; |
2184 | case FORMAT_TYPE_ULONG: |
2185 | case FORMAT_TYPE_LONG: |
2186 | num = get_arg(unsigned long); |
2187 | break; |
2188 | case FORMAT_TYPE_SIZE_T: |
2189 | num = get_arg(size_t); |
2190 | break; |
2191 | case FORMAT_TYPE_PTRDIFF: |
2192 | num = get_arg(ptrdiff_t); |
2193 | break; |
2194 | case FORMAT_TYPE_UBYTE: |
2195 | num = get_arg(unsigned char); |
2196 | break; |
2197 | case FORMAT_TYPE_BYTE: |
2198 | num = get_arg(signed char); |
2199 | break; |
2200 | case FORMAT_TYPE_USHORT: |
2201 | num = get_arg(unsigned short); |
2202 | break; |
2203 | case FORMAT_TYPE_SHORT: |
2204 | num = get_arg(short); |
2205 | break; |
2206 | case FORMAT_TYPE_UINT: |
2207 | num = get_arg(unsigned int); |
2208 | break; |
2209 | default: |
2210 | num = get_arg(int); |
2211 | } |
2212 | |
2213 | str = number(str, end, num, spec); |
2214 | } /* default: */ |
2215 | } /* switch(spec.type) */ |
2216 | } /* while(*fmt) */ |
2217 | |
2218 | if (size > 0) { |
2219 | if (str < end) |
2220 | *str = '\0'; |
2221 | else |
2222 | end[-1] = '\0'; |
2223 | } |
2224 | |
2225 | #undef get_arg |
2226 | |
2227 | /* the trailing null byte doesn't count towards the total */ |
2228 | return str - buf; |
2229 | } |
2230 | EXPORT_SYMBOL_GPL(bstr_printf); |
2231 | |
2232 | /** |
2233 | * bprintf - Parse a format string and place args' binary value in a buffer |
2234 | * @bin_buf: The buffer to place args' binary value |
2235 | * @size: The size of the buffer(by words(32bits), not characters) |
2236 | * @fmt: The format string to use |
2237 | * @...: Arguments for the format string |
2238 | * |
2239 | * The function returns the number of words(u32) written |
2240 | * into @bin_buf. |
2241 | */ |
2242 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) |
2243 | { |
2244 | va_list args; |
2245 | int ret; |
2246 | |
2247 | va_start(args, fmt); |
2248 | ret = vbin_printf(bin_buf, size, fmt, args); |
2249 | va_end(args); |
2250 | |
2251 | return ret; |
2252 | } |
2253 | EXPORT_SYMBOL_GPL(bprintf); |
2254 | |
2255 | #endif /* CONFIG_BINARY_PRINTF */ |
2256 | |
2257 | /** |
2258 | * vsscanf - Unformat a buffer into a list of arguments |
2259 | * @buf: input buffer |
2260 | * @fmt: format of buffer |
2261 | * @args: arguments |
2262 | */ |
2263 | int vsscanf(const char *buf, const char *fmt, va_list args) |
2264 | { |
2265 | const char *str = buf; |
2266 | char *next; |
2267 | char digit; |
2268 | int num = 0; |
2269 | u8 qualifier; |
2270 | unsigned int base; |
2271 | union { |
2272 | long long s; |
2273 | unsigned long long u; |
2274 | } val; |
2275 | s16 field_width; |
2276 | bool is_sign; |
2277 | |
2278 | while (*fmt) { |
2279 | /* skip any white space in format */ |
2280 | /* white space in format matchs any amount of |
2281 | * white space, including none, in the input. |
2282 | */ |
2283 | if (isspace(*fmt)) { |
2284 | fmt = skip_spaces(++fmt); |
2285 | str = skip_spaces(str); |
2286 | } |
2287 | |
2288 | /* anything that is not a conversion must match exactly */ |
2289 | if (*fmt != '%' && *fmt) { |
2290 | if (*fmt++ != *str++) |
2291 | break; |
2292 | continue; |
2293 | } |
2294 | |
2295 | if (!*fmt) |
2296 | break; |
2297 | ++fmt; |
2298 | |
2299 | /* skip this conversion. |
2300 | * advance both strings to next white space |
2301 | */ |
2302 | if (*fmt == '*') { |
2303 | if (!*str) |
2304 | break; |
2305 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
2306 | fmt++; |
2307 | while (!isspace(*str) && *str) |
2308 | str++; |
2309 | continue; |
2310 | } |
2311 | |
2312 | /* get field width */ |
2313 | field_width = -1; |
2314 | if (isdigit(*fmt)) { |
2315 | field_width = skip_atoi(&fmt); |
2316 | if (field_width <= 0) |
2317 | break; |
2318 | } |
2319 | |
2320 | /* get conversion qualifier */ |
2321 | qualifier = -1; |
2322 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2323 | _tolower(*fmt) == 'z') { |
2324 | qualifier = *fmt++; |
2325 | if (unlikely(qualifier == *fmt)) { |
2326 | if (qualifier == 'h') { |
2327 | qualifier = 'H'; |
2328 | fmt++; |
2329 | } else if (qualifier == 'l') { |
2330 | qualifier = 'L'; |
2331 | fmt++; |
2332 | } |
2333 | } |
2334 | } |
2335 | |
2336 | if (!*fmt) |
2337 | break; |
2338 | |
2339 | if (*fmt == 'n') { |
2340 | /* return number of characters read so far */ |
2341 | *va_arg(args, int *) = str - buf; |
2342 | ++fmt; |
2343 | continue; |
2344 | } |
2345 | |
2346 | if (!*str) |
2347 | break; |
2348 | |
2349 | base = 10; |
2350 | is_sign = false; |
2351 | |
2352 | switch (*fmt++) { |
2353 | case 'c': |
2354 | { |
2355 | char *s = (char *)va_arg(args, char*); |
2356 | if (field_width == -1) |
2357 | field_width = 1; |
2358 | do { |
2359 | *s++ = *str++; |
2360 | } while (--field_width > 0 && *str); |
2361 | num++; |
2362 | } |
2363 | continue; |
2364 | case 's': |
2365 | { |
2366 | char *s = (char *)va_arg(args, char *); |
2367 | if (field_width == -1) |
2368 | field_width = SHRT_MAX; |
2369 | /* first, skip leading white space in buffer */ |
2370 | str = skip_spaces(str); |
2371 | |
2372 | /* now copy until next white space */ |
2373 | while (*str && !isspace(*str) && field_width--) |
2374 | *s++ = *str++; |
2375 | *s = '\0'; |
2376 | num++; |
2377 | } |
2378 | continue; |
2379 | case 'o': |
2380 | base = 8; |
2381 | break; |
2382 | case 'x': |
2383 | case 'X': |
2384 | base = 16; |
2385 | break; |
2386 | case 'i': |
2387 | base = 0; |
2388 | case 'd': |
2389 | is_sign = true; |
2390 | case 'u': |
2391 | break; |
2392 | case '%': |
2393 | /* looking for '%' in str */ |
2394 | if (*str++ != '%') |
2395 | return num; |
2396 | continue; |
2397 | default: |
2398 | /* invalid format; stop here */ |
2399 | return num; |
2400 | } |
2401 | |
2402 | /* have some sort of integer conversion. |
2403 | * first, skip white space in buffer. |
2404 | */ |
2405 | str = skip_spaces(str); |
2406 | |
2407 | digit = *str; |
2408 | if (is_sign && digit == '-') |
2409 | digit = *(str + 1); |
2410 | |
2411 | if (!digit |
2412 | || (base == 16 && !isxdigit(digit)) |
2413 | || (base == 10 && !isdigit(digit)) |
2414 | || (base == 8 && (!isdigit(digit) || digit > '7')) |
2415 | || (base == 0 && !isdigit(digit))) |
2416 | break; |
2417 | |
2418 | if (is_sign) |
2419 | val.s = qualifier != 'L' ? |
2420 | simple_strtol(str, &next, base) : |
2421 | simple_strtoll(str, &next, base); |
2422 | else |
2423 | val.u = qualifier != 'L' ? |
2424 | simple_strtoul(str, &next, base) : |
2425 | simple_strtoull(str, &next, base); |
2426 | |
2427 | if (field_width > 0 && next - str > field_width) { |
2428 | if (base == 0) |
2429 | _parse_integer_fixup_radix(str, &base); |
2430 | while (next - str > field_width) { |
2431 | if (is_sign) |
2432 | val.s = div_s64(val.s, base); |
2433 | else |
2434 | val.u = div_u64(val.u, base); |
2435 | --next; |
2436 | } |
2437 | } |
2438 | |
2439 | switch (qualifier) { |
2440 | case 'H': /* that's 'hh' in format */ |
2441 | if (is_sign) |
2442 | *va_arg(args, signed char *) = val.s; |
2443 | else |
2444 | *va_arg(args, unsigned char *) = val.u; |
2445 | break; |
2446 | case 'h': |
2447 | if (is_sign) |
2448 | *va_arg(args, short *) = val.s; |
2449 | else |
2450 | *va_arg(args, unsigned short *) = val.u; |
2451 | break; |
2452 | case 'l': |
2453 | if (is_sign) |
2454 | *va_arg(args, long *) = val.s; |
2455 | else |
2456 | *va_arg(args, unsigned long *) = val.u; |
2457 | break; |
2458 | case 'L': |
2459 | if (is_sign) |
2460 | *va_arg(args, long long *) = val.s; |
2461 | else |
2462 | *va_arg(args, unsigned long long *) = val.u; |
2463 | break; |
2464 | case 'Z': |
2465 | case 'z': |
2466 | *va_arg(args, size_t *) = val.u; |
2467 | break; |
2468 | default: |
2469 | if (is_sign) |
2470 | *va_arg(args, int *) = val.s; |
2471 | else |
2472 | *va_arg(args, unsigned int *) = val.u; |
2473 | break; |
2474 | } |
2475 | num++; |
2476 | |
2477 | if (!next) |
2478 | break; |
2479 | str = next; |
2480 | } |
2481 | |
2482 | return num; |
2483 | } |
2484 | EXPORT_SYMBOL(vsscanf); |
2485 | |
2486 | /** |
2487 | * sscanf - Unformat a buffer into a list of arguments |
2488 | * @buf: input buffer |
2489 | * @fmt: formatting of buffer |
2490 | * @...: resulting arguments |
2491 | */ |
2492 | int sscanf(const char *buf, const char *fmt, ...) |
2493 | { |
2494 | va_list args; |
2495 | int i; |
2496 | |
2497 | va_start(args, fmt); |
2498 | i = vsscanf(buf, fmt, args); |
2499 | va_end(args); |
2500 | |
2501 | return i; |
2502 | } |
2503 | EXPORT_SYMBOL(sscanf); |
2504 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9