blob: 43f9b90f6be45aae6342d876d31b37c3530ce473
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/clk.h> |
21 | #include <linux/clk-provider.h> |
22 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
23 | #include <linux/types.h> |
24 | #include <linux/string.h> |
25 | #include <linux/ctype.h> |
26 | #include <linux/kernel.h> |
27 | #include <linux/kallsyms.h> |
28 | #include <linux/math64.h> |
29 | #include <linux/uaccess.h> |
30 | #include <linux/ioport.h> |
31 | #include <linux/dcache.h> |
32 | #include <linux/cred.h> |
33 | #include <linux/uuid.h> |
34 | #include <net/addrconf.h> |
35 | #include <linux/siphash.h> |
36 | #include <linux/compiler.h> |
37 | #ifdef CONFIG_BLOCK |
38 | #include <linux/blkdev.h> |
39 | #endif |
40 | |
41 | #include "../mm/internal.h" /* For the trace_print_flags arrays */ |
42 | |
43 | #include <asm/page.h> /* for PAGE_SIZE */ |
44 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
45 | #include <asm/byteorder.h> /* cpu_to_le16 */ |
46 | |
47 | #include <linux/string_helpers.h> |
48 | #include "kstrtox.h" |
49 | |
50 | /** |
51 | * simple_strtoull - convert a string to an unsigned long long |
52 | * @cp: The start of the string |
53 | * @endp: A pointer to the end of the parsed string will be placed here |
54 | * @base: The number base to use |
55 | * |
56 | * This function is obsolete. Please use kstrtoull instead. |
57 | */ |
58 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
59 | { |
60 | unsigned long long result; |
61 | unsigned int rv; |
62 | |
63 | cp = _parse_integer_fixup_radix(cp, &base); |
64 | rv = _parse_integer(cp, base, &result); |
65 | /* FIXME */ |
66 | cp += (rv & ~KSTRTOX_OVERFLOW); |
67 | |
68 | if (endp) |
69 | *endp = (char *)cp; |
70 | |
71 | return result; |
72 | } |
73 | EXPORT_SYMBOL(simple_strtoull); |
74 | |
75 | /** |
76 | * simple_strtoul - convert a string to an unsigned long |
77 | * @cp: The start of the string |
78 | * @endp: A pointer to the end of the parsed string will be placed here |
79 | * @base: The number base to use |
80 | * |
81 | * This function is obsolete. Please use kstrtoul instead. |
82 | */ |
83 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
84 | { |
85 | return simple_strtoull(cp, endp, base); |
86 | } |
87 | EXPORT_SYMBOL(simple_strtoul); |
88 | |
89 | /** |
90 | * simple_strtol - convert a string to a signed long |
91 | * @cp: The start of the string |
92 | * @endp: A pointer to the end of the parsed string will be placed here |
93 | * @base: The number base to use |
94 | * |
95 | * This function is obsolete. Please use kstrtol instead. |
96 | */ |
97 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
98 | { |
99 | if (*cp == '-') |
100 | return -simple_strtoul(cp + 1, endp, base); |
101 | |
102 | return simple_strtoul(cp, endp, base); |
103 | } |
104 | EXPORT_SYMBOL(simple_strtol); |
105 | |
106 | /** |
107 | * simple_strtoll - convert a string to a signed long long |
108 | * @cp: The start of the string |
109 | * @endp: A pointer to the end of the parsed string will be placed here |
110 | * @base: The number base to use |
111 | * |
112 | * This function is obsolete. Please use kstrtoll instead. |
113 | */ |
114 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
115 | { |
116 | if (*cp == '-') |
117 | return -simple_strtoull(cp + 1, endp, base); |
118 | |
119 | return simple_strtoull(cp, endp, base); |
120 | } |
121 | EXPORT_SYMBOL(simple_strtoll); |
122 | |
123 | static noinline_for_stack |
124 | int skip_atoi(const char **s) |
125 | { |
126 | int i = 0; |
127 | |
128 | do { |
129 | i = i*10 + *((*s)++) - '0'; |
130 | } while (isdigit(**s)); |
131 | |
132 | return i; |
133 | } |
134 | |
135 | /* |
136 | * Decimal conversion is by far the most typical, and is used for |
137 | * /proc and /sys data. This directly impacts e.g. top performance |
138 | * with many processes running. We optimize it for speed by emitting |
139 | * two characters at a time, using a 200 byte lookup table. This |
140 | * roughly halves the number of multiplications compared to computing |
141 | * the digits one at a time. Implementation strongly inspired by the |
142 | * previous version, which in turn used ideas described at |
143 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission |
144 | * from the author, Douglas W. Jones). |
145 | * |
146 | * It turns out there is precisely one 26 bit fixed-point |
147 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 |
148 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual |
149 | * range happens to be somewhat larger (x <= 1073741898), but that's |
150 | * irrelevant for our purpose. |
151 | * |
152 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still |
153 | * need a 32x32->64 bit multiply, so we simply use the same constant. |
154 | * |
155 | * For dividing a number in the range [100, 10^4-1] by 100, there are |
156 | * several options. The simplest is (x * 0x147b) >> 19, which is valid |
157 | * for all x <= 43698. |
158 | */ |
159 | |
160 | static const u16 decpair[100] = { |
161 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) |
162 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), |
163 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), |
164 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), |
165 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), |
166 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), |
167 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), |
168 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), |
169 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), |
170 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), |
171 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), |
172 | #undef _ |
173 | }; |
174 | |
175 | /* |
176 | * This will print a single '0' even if r == 0, since we would |
177 | * immediately jump to out_r where two 0s would be written but only |
178 | * one of them accounted for in buf. This is needed by ip4_string |
179 | * below. All other callers pass a non-zero value of r. |
180 | */ |
181 | static noinline_for_stack |
182 | char *put_dec_trunc8(char *buf, unsigned r) |
183 | { |
184 | unsigned q; |
185 | |
186 | /* 1 <= r < 10^8 */ |
187 | if (r < 100) |
188 | goto out_r; |
189 | |
190 | /* 100 <= r < 10^8 */ |
191 | q = (r * (u64)0x28f5c29) >> 32; |
192 | *((u16 *)buf) = decpair[r - 100*q]; |
193 | buf += 2; |
194 | |
195 | /* 1 <= q < 10^6 */ |
196 | if (q < 100) |
197 | goto out_q; |
198 | |
199 | /* 100 <= q < 10^6 */ |
200 | r = (q * (u64)0x28f5c29) >> 32; |
201 | *((u16 *)buf) = decpair[q - 100*r]; |
202 | buf += 2; |
203 | |
204 | /* 1 <= r < 10^4 */ |
205 | if (r < 100) |
206 | goto out_r; |
207 | |
208 | /* 100 <= r < 10^4 */ |
209 | q = (r * 0x147b) >> 19; |
210 | *((u16 *)buf) = decpair[r - 100*q]; |
211 | buf += 2; |
212 | out_q: |
213 | /* 1 <= q < 100 */ |
214 | r = q; |
215 | out_r: |
216 | /* 1 <= r < 100 */ |
217 | *((u16 *)buf) = decpair[r]; |
218 | buf += r < 10 ? 1 : 2; |
219 | return buf; |
220 | } |
221 | |
222 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 |
223 | static noinline_for_stack |
224 | char *put_dec_full8(char *buf, unsigned r) |
225 | { |
226 | unsigned q; |
227 | |
228 | /* 0 <= r < 10^8 */ |
229 | q = (r * (u64)0x28f5c29) >> 32; |
230 | *((u16 *)buf) = decpair[r - 100*q]; |
231 | buf += 2; |
232 | |
233 | /* 0 <= q < 10^6 */ |
234 | r = (q * (u64)0x28f5c29) >> 32; |
235 | *((u16 *)buf) = decpair[q - 100*r]; |
236 | buf += 2; |
237 | |
238 | /* 0 <= r < 10^4 */ |
239 | q = (r * 0x147b) >> 19; |
240 | *((u16 *)buf) = decpair[r - 100*q]; |
241 | buf += 2; |
242 | |
243 | /* 0 <= q < 100 */ |
244 | *((u16 *)buf) = decpair[q]; |
245 | buf += 2; |
246 | return buf; |
247 | } |
248 | |
249 | static noinline_for_stack |
250 | char *put_dec(char *buf, unsigned long long n) |
251 | { |
252 | if (n >= 100*1000*1000) |
253 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); |
254 | /* 1 <= n <= 1.6e11 */ |
255 | if (n >= 100*1000*1000) |
256 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); |
257 | /* 1 <= n < 1e8 */ |
258 | return put_dec_trunc8(buf, n); |
259 | } |
260 | |
261 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 |
262 | |
263 | static void |
264 | put_dec_full4(char *buf, unsigned r) |
265 | { |
266 | unsigned q; |
267 | |
268 | /* 0 <= r < 10^4 */ |
269 | q = (r * 0x147b) >> 19; |
270 | *((u16 *)buf) = decpair[r - 100*q]; |
271 | buf += 2; |
272 | /* 0 <= q < 100 */ |
273 | *((u16 *)buf) = decpair[q]; |
274 | } |
275 | |
276 | /* |
277 | * Call put_dec_full4 on x % 10000, return x / 10000. |
278 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 |
279 | * holds for all x < 1,128,869,999. The largest value this |
280 | * helper will ever be asked to convert is 1,125,520,955. |
281 | * (second call in the put_dec code, assuming n is all-ones). |
282 | */ |
283 | static noinline_for_stack |
284 | unsigned put_dec_helper4(char *buf, unsigned x) |
285 | { |
286 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; |
287 | |
288 | put_dec_full4(buf, x - q * 10000); |
289 | return q; |
290 | } |
291 | |
292 | /* Based on code by Douglas W. Jones found at |
293 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> |
294 | * (with permission from the author). |
295 | * Performs no 64-bit division and hence should be fast on 32-bit machines. |
296 | */ |
297 | static |
298 | char *put_dec(char *buf, unsigned long long n) |
299 | { |
300 | uint32_t d3, d2, d1, q, h; |
301 | |
302 | if (n < 100*1000*1000) |
303 | return put_dec_trunc8(buf, n); |
304 | |
305 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ |
306 | h = (n >> 32); |
307 | d2 = (h ) & 0xffff; |
308 | d3 = (h >> 16); /* implicit "& 0xffff" */ |
309 | |
310 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 |
311 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ |
312 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
313 | q = put_dec_helper4(buf, q); |
314 | |
315 | q += 7671 * d3 + 9496 * d2 + 6 * d1; |
316 | q = put_dec_helper4(buf+4, q); |
317 | |
318 | q += 4749 * d3 + 42 * d2; |
319 | q = put_dec_helper4(buf+8, q); |
320 | |
321 | q += 281 * d3; |
322 | buf += 12; |
323 | if (q) |
324 | buf = put_dec_trunc8(buf, q); |
325 | else while (buf[-1] == '0') |
326 | --buf; |
327 | |
328 | return buf; |
329 | } |
330 | |
331 | #endif |
332 | |
333 | /* |
334 | * Convert passed number to decimal string. |
335 | * Returns the length of string. On buffer overflow, returns 0. |
336 | * |
337 | * If speed is not important, use snprintf(). It's easy to read the code. |
338 | */ |
339 | int num_to_str(char *buf, int size, unsigned long long num) |
340 | { |
341 | /* put_dec requires 2-byte alignment of the buffer. */ |
342 | char tmp[sizeof(num) * 3] __aligned(2); |
343 | int idx, len; |
344 | |
345 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
346 | if (num <= 9) { |
347 | tmp[0] = '0' + num; |
348 | len = 1; |
349 | } else { |
350 | len = put_dec(tmp, num) - tmp; |
351 | } |
352 | |
353 | if (len > size) |
354 | return 0; |
355 | for (idx = 0; idx < len; ++idx) |
356 | buf[idx] = tmp[len - idx - 1]; |
357 | return len; |
358 | } |
359 | |
360 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
361 | #define LEFT 2 /* left justified */ |
362 | #define PLUS 4 /* show plus */ |
363 | #define SPACE 8 /* space if plus */ |
364 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
365 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
366 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ |
367 | |
368 | enum format_type { |
369 | FORMAT_TYPE_NONE, /* Just a string part */ |
370 | FORMAT_TYPE_WIDTH, |
371 | FORMAT_TYPE_PRECISION, |
372 | FORMAT_TYPE_CHAR, |
373 | FORMAT_TYPE_STR, |
374 | FORMAT_TYPE_PTR, |
375 | FORMAT_TYPE_PERCENT_CHAR, |
376 | FORMAT_TYPE_INVALID, |
377 | FORMAT_TYPE_LONG_LONG, |
378 | FORMAT_TYPE_ULONG, |
379 | FORMAT_TYPE_LONG, |
380 | FORMAT_TYPE_UBYTE, |
381 | FORMAT_TYPE_BYTE, |
382 | FORMAT_TYPE_USHORT, |
383 | FORMAT_TYPE_SHORT, |
384 | FORMAT_TYPE_UINT, |
385 | FORMAT_TYPE_INT, |
386 | FORMAT_TYPE_SIZE_T, |
387 | FORMAT_TYPE_PTRDIFF |
388 | }; |
389 | |
390 | struct printf_spec { |
391 | unsigned int type:8; /* format_type enum */ |
392 | signed int field_width:24; /* width of output field */ |
393 | unsigned int flags:8; /* flags to number() */ |
394 | unsigned int base:8; /* number base, 8, 10 or 16 only */ |
395 | signed int precision:16; /* # of digits/chars */ |
396 | } __packed; |
397 | #define FIELD_WIDTH_MAX ((1 << 23) - 1) |
398 | #define PRECISION_MAX ((1 << 15) - 1) |
399 | |
400 | static noinline_for_stack |
401 | char *number(char *buf, char *end, unsigned long long num, |
402 | struct printf_spec spec) |
403 | { |
404 | /* put_dec requires 2-byte alignment of the buffer. */ |
405 | char tmp[3 * sizeof(num)] __aligned(2); |
406 | char sign; |
407 | char locase; |
408 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
409 | int i; |
410 | bool is_zero = num == 0LL; |
411 | int field_width = spec.field_width; |
412 | int precision = spec.precision; |
413 | |
414 | BUILD_BUG_ON(sizeof(struct printf_spec) != 8); |
415 | |
416 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
417 | * produces same digits or (maybe lowercased) letters */ |
418 | locase = (spec.flags & SMALL); |
419 | if (spec.flags & LEFT) |
420 | spec.flags &= ~ZEROPAD; |
421 | sign = 0; |
422 | if (spec.flags & SIGN) { |
423 | if ((signed long long)num < 0) { |
424 | sign = '-'; |
425 | num = -(signed long long)num; |
426 | field_width--; |
427 | } else if (spec.flags & PLUS) { |
428 | sign = '+'; |
429 | field_width--; |
430 | } else if (spec.flags & SPACE) { |
431 | sign = ' '; |
432 | field_width--; |
433 | } |
434 | } |
435 | if (need_pfx) { |
436 | if (spec.base == 16) |
437 | field_width -= 2; |
438 | else if (!is_zero) |
439 | field_width--; |
440 | } |
441 | |
442 | /* generate full string in tmp[], in reverse order */ |
443 | i = 0; |
444 | if (num < spec.base) |
445 | tmp[i++] = hex_asc_upper[num] | locase; |
446 | else if (spec.base != 10) { /* 8 or 16 */ |
447 | int mask = spec.base - 1; |
448 | int shift = 3; |
449 | |
450 | if (spec.base == 16) |
451 | shift = 4; |
452 | do { |
453 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
454 | num >>= shift; |
455 | } while (num); |
456 | } else { /* base 10 */ |
457 | i = put_dec(tmp, num) - tmp; |
458 | } |
459 | |
460 | /* printing 100 using %2d gives "100", not "00" */ |
461 | if (i > precision) |
462 | precision = i; |
463 | /* leading space padding */ |
464 | field_width -= precision; |
465 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
466 | while (--field_width >= 0) { |
467 | if (buf < end) |
468 | *buf = ' '; |
469 | ++buf; |
470 | } |
471 | } |
472 | /* sign */ |
473 | if (sign) { |
474 | if (buf < end) |
475 | *buf = sign; |
476 | ++buf; |
477 | } |
478 | /* "0x" / "0" prefix */ |
479 | if (need_pfx) { |
480 | if (spec.base == 16 || !is_zero) { |
481 | if (buf < end) |
482 | *buf = '0'; |
483 | ++buf; |
484 | } |
485 | if (spec.base == 16) { |
486 | if (buf < end) |
487 | *buf = ('X' | locase); |
488 | ++buf; |
489 | } |
490 | } |
491 | /* zero or space padding */ |
492 | if (!(spec.flags & LEFT)) { |
493 | char c = ' ' + (spec.flags & ZEROPAD); |
494 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); |
495 | while (--field_width >= 0) { |
496 | if (buf < end) |
497 | *buf = c; |
498 | ++buf; |
499 | } |
500 | } |
501 | /* hmm even more zero padding? */ |
502 | while (i <= --precision) { |
503 | if (buf < end) |
504 | *buf = '0'; |
505 | ++buf; |
506 | } |
507 | /* actual digits of result */ |
508 | while (--i >= 0) { |
509 | if (buf < end) |
510 | *buf = tmp[i]; |
511 | ++buf; |
512 | } |
513 | /* trailing space padding */ |
514 | while (--field_width >= 0) { |
515 | if (buf < end) |
516 | *buf = ' '; |
517 | ++buf; |
518 | } |
519 | |
520 | return buf; |
521 | } |
522 | |
523 | static noinline_for_stack |
524 | char *special_hex_number(char *buf, char *end, unsigned long long num, int size) |
525 | { |
526 | struct printf_spec spec; |
527 | |
528 | spec.type = FORMAT_TYPE_PTR; |
529 | spec.field_width = 2 + 2 * size; /* 0x + hex */ |
530 | spec.flags = SPECIAL | SMALL | ZEROPAD; |
531 | spec.base = 16; |
532 | spec.precision = -1; |
533 | |
534 | return number(buf, end, num, spec); |
535 | } |
536 | |
537 | static void move_right(char *buf, char *end, unsigned len, unsigned spaces) |
538 | { |
539 | size_t size; |
540 | if (buf >= end) /* nowhere to put anything */ |
541 | return; |
542 | size = end - buf; |
543 | if (size <= spaces) { |
544 | memset(buf, ' ', size); |
545 | return; |
546 | } |
547 | if (len) { |
548 | if (len > size - spaces) |
549 | len = size - spaces; |
550 | memmove(buf + spaces, buf, len); |
551 | } |
552 | memset(buf, ' ', spaces); |
553 | } |
554 | |
555 | /* |
556 | * Handle field width padding for a string. |
557 | * @buf: current buffer position |
558 | * @n: length of string |
559 | * @end: end of output buffer |
560 | * @spec: for field width and flags |
561 | * Returns: new buffer position after padding. |
562 | */ |
563 | static noinline_for_stack |
564 | char *widen_string(char *buf, int n, char *end, struct printf_spec spec) |
565 | { |
566 | unsigned spaces; |
567 | |
568 | if (likely(n >= spec.field_width)) |
569 | return buf; |
570 | /* we want to pad the sucker */ |
571 | spaces = spec.field_width - n; |
572 | if (!(spec.flags & LEFT)) { |
573 | move_right(buf - n, end, n, spaces); |
574 | return buf + spaces; |
575 | } |
576 | while (spaces--) { |
577 | if (buf < end) |
578 | *buf = ' '; |
579 | ++buf; |
580 | } |
581 | return buf; |
582 | } |
583 | |
584 | static noinline_for_stack |
585 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) |
586 | { |
587 | int len = 0; |
588 | size_t lim = spec.precision; |
589 | |
590 | if ((unsigned long)s < PAGE_SIZE) |
591 | s = "(null)"; |
592 | |
593 | while (lim--) { |
594 | char c = *s++; |
595 | if (!c) |
596 | break; |
597 | if (buf < end) |
598 | *buf = c; |
599 | ++buf; |
600 | ++len; |
601 | } |
602 | return widen_string(buf, len, end, spec); |
603 | } |
604 | |
605 | static noinline_for_stack |
606 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, |
607 | const char *fmt) |
608 | { |
609 | const char *array[4], *s; |
610 | const struct dentry *p; |
611 | int depth; |
612 | int i, n; |
613 | |
614 | switch (fmt[1]) { |
615 | case '2': case '3': case '4': |
616 | depth = fmt[1] - '0'; |
617 | break; |
618 | default: |
619 | depth = 1; |
620 | } |
621 | |
622 | rcu_read_lock(); |
623 | for (i = 0; i < depth; i++, d = p) { |
624 | p = ACCESS_ONCE(d->d_parent); |
625 | array[i] = ACCESS_ONCE(d->d_name.name); |
626 | if (p == d) { |
627 | if (i) |
628 | array[i] = ""; |
629 | i++; |
630 | break; |
631 | } |
632 | } |
633 | s = array[--i]; |
634 | for (n = 0; n != spec.precision; n++, buf++) { |
635 | char c = *s++; |
636 | if (!c) { |
637 | if (!i) |
638 | break; |
639 | c = '/'; |
640 | s = array[--i]; |
641 | } |
642 | if (buf < end) |
643 | *buf = c; |
644 | } |
645 | rcu_read_unlock(); |
646 | return widen_string(buf, n, end, spec); |
647 | } |
648 | |
649 | #ifdef CONFIG_BLOCK |
650 | static noinline_for_stack |
651 | char *bdev_name(char *buf, char *end, struct block_device *bdev, |
652 | struct printf_spec spec, const char *fmt) |
653 | { |
654 | struct gendisk *hd = bdev->bd_disk; |
655 | |
656 | buf = string(buf, end, hd->disk_name, spec); |
657 | if (bdev->bd_part->partno) { |
658 | if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { |
659 | if (buf < end) |
660 | *buf = 'p'; |
661 | buf++; |
662 | } |
663 | buf = number(buf, end, bdev->bd_part->partno, spec); |
664 | } |
665 | return buf; |
666 | } |
667 | #endif |
668 | |
669 | static noinline_for_stack |
670 | char *symbol_string(char *buf, char *end, void *ptr, |
671 | struct printf_spec spec, const char *fmt) |
672 | { |
673 | unsigned long value; |
674 | #ifdef CONFIG_KALLSYMS |
675 | char sym[KSYM_SYMBOL_LEN]; |
676 | #endif |
677 | |
678 | if (fmt[1] == 'R') |
679 | ptr = __builtin_extract_return_addr(ptr); |
680 | value = (unsigned long)ptr; |
681 | |
682 | #ifdef CONFIG_KALLSYMS |
683 | if (*fmt == 'B') |
684 | sprint_backtrace(sym, value); |
685 | else if (*fmt != 'f' && *fmt != 's') |
686 | sprint_symbol(sym, value); |
687 | else |
688 | sprint_symbol_no_offset(sym, value); |
689 | |
690 | return string(buf, end, sym, spec); |
691 | #else |
692 | return special_hex_number(buf, end, value, sizeof(void *)); |
693 | #endif |
694 | } |
695 | |
696 | static noinline_for_stack |
697 | char *resource_string(char *buf, char *end, struct resource *res, |
698 | struct printf_spec spec, const char *fmt) |
699 | { |
700 | #ifndef IO_RSRC_PRINTK_SIZE |
701 | #define IO_RSRC_PRINTK_SIZE 6 |
702 | #endif |
703 | |
704 | #ifndef MEM_RSRC_PRINTK_SIZE |
705 | #define MEM_RSRC_PRINTK_SIZE 10 |
706 | #endif |
707 | static const struct printf_spec io_spec = { |
708 | .base = 16, |
709 | .field_width = IO_RSRC_PRINTK_SIZE, |
710 | .precision = -1, |
711 | .flags = SPECIAL | SMALL | ZEROPAD, |
712 | }; |
713 | static const struct printf_spec mem_spec = { |
714 | .base = 16, |
715 | .field_width = MEM_RSRC_PRINTK_SIZE, |
716 | .precision = -1, |
717 | .flags = SPECIAL | SMALL | ZEROPAD, |
718 | }; |
719 | static const struct printf_spec bus_spec = { |
720 | .base = 16, |
721 | .field_width = 2, |
722 | .precision = -1, |
723 | .flags = SMALL | ZEROPAD, |
724 | }; |
725 | static const struct printf_spec dec_spec = { |
726 | .base = 10, |
727 | .precision = -1, |
728 | .flags = 0, |
729 | }; |
730 | static const struct printf_spec str_spec = { |
731 | .field_width = -1, |
732 | .precision = 10, |
733 | .flags = LEFT, |
734 | }; |
735 | static const struct printf_spec flag_spec = { |
736 | .base = 16, |
737 | .precision = -1, |
738 | .flags = SPECIAL | SMALL, |
739 | }; |
740 | |
741 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) |
742 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ |
743 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) |
744 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) |
745 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
746 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
747 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, |
748 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; |
749 | |
750 | char *p = sym, *pend = sym + sizeof(sym); |
751 | int decode = (fmt[0] == 'R') ? 1 : 0; |
752 | const struct printf_spec *specp; |
753 | |
754 | *p++ = '['; |
755 | if (res->flags & IORESOURCE_IO) { |
756 | p = string(p, pend, "io ", str_spec); |
757 | specp = &io_spec; |
758 | } else if (res->flags & IORESOURCE_MEM) { |
759 | p = string(p, pend, "mem ", str_spec); |
760 | specp = &mem_spec; |
761 | } else if (res->flags & IORESOURCE_IRQ) { |
762 | p = string(p, pend, "irq ", str_spec); |
763 | specp = &dec_spec; |
764 | } else if (res->flags & IORESOURCE_DMA) { |
765 | p = string(p, pend, "dma ", str_spec); |
766 | specp = &dec_spec; |
767 | } else if (res->flags & IORESOURCE_BUS) { |
768 | p = string(p, pend, "bus ", str_spec); |
769 | specp = &bus_spec; |
770 | } else { |
771 | p = string(p, pend, "??? ", str_spec); |
772 | specp = &mem_spec; |
773 | decode = 0; |
774 | } |
775 | if (decode && res->flags & IORESOURCE_UNSET) { |
776 | p = string(p, pend, "size ", str_spec); |
777 | p = number(p, pend, resource_size(res), *specp); |
778 | } else { |
779 | p = number(p, pend, res->start, *specp); |
780 | if (res->start != res->end) { |
781 | *p++ = '-'; |
782 | p = number(p, pend, res->end, *specp); |
783 | } |
784 | } |
785 | if (decode) { |
786 | if (res->flags & IORESOURCE_MEM_64) |
787 | p = string(p, pend, " 64bit", str_spec); |
788 | if (res->flags & IORESOURCE_PREFETCH) |
789 | p = string(p, pend, " pref", str_spec); |
790 | if (res->flags & IORESOURCE_WINDOW) |
791 | p = string(p, pend, " window", str_spec); |
792 | if (res->flags & IORESOURCE_DISABLED) |
793 | p = string(p, pend, " disabled", str_spec); |
794 | } else { |
795 | p = string(p, pend, " flags ", str_spec); |
796 | p = number(p, pend, res->flags, flag_spec); |
797 | } |
798 | *p++ = ']'; |
799 | *p = '\0'; |
800 | |
801 | return string(buf, end, sym, spec); |
802 | } |
803 | |
804 | static noinline_for_stack |
805 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, |
806 | const char *fmt) |
807 | { |
808 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
809 | negative value, fallback to the default */ |
810 | char separator; |
811 | |
812 | if (spec.field_width == 0) |
813 | /* nothing to print */ |
814 | return buf; |
815 | |
816 | if (ZERO_OR_NULL_PTR(addr)) |
817 | /* NULL pointer */ |
818 | return string(buf, end, NULL, spec); |
819 | |
820 | switch (fmt[1]) { |
821 | case 'C': |
822 | separator = ':'; |
823 | break; |
824 | case 'D': |
825 | separator = '-'; |
826 | break; |
827 | case 'N': |
828 | separator = 0; |
829 | break; |
830 | default: |
831 | separator = ' '; |
832 | break; |
833 | } |
834 | |
835 | if (spec.field_width > 0) |
836 | len = min_t(int, spec.field_width, 64); |
837 | |
838 | for (i = 0; i < len; ++i) { |
839 | if (buf < end) |
840 | *buf = hex_asc_hi(addr[i]); |
841 | ++buf; |
842 | if (buf < end) |
843 | *buf = hex_asc_lo(addr[i]); |
844 | ++buf; |
845 | |
846 | if (separator && i != len - 1) { |
847 | if (buf < end) |
848 | *buf = separator; |
849 | ++buf; |
850 | } |
851 | } |
852 | |
853 | return buf; |
854 | } |
855 | |
856 | static noinline_for_stack |
857 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, |
858 | struct printf_spec spec, const char *fmt) |
859 | { |
860 | const int CHUNKSZ = 32; |
861 | int nr_bits = max_t(int, spec.field_width, 0); |
862 | int i, chunksz; |
863 | bool first = true; |
864 | |
865 | /* reused to print numbers */ |
866 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; |
867 | |
868 | chunksz = nr_bits & (CHUNKSZ - 1); |
869 | if (chunksz == 0) |
870 | chunksz = CHUNKSZ; |
871 | |
872 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; |
873 | for (; i >= 0; i -= CHUNKSZ) { |
874 | u32 chunkmask, val; |
875 | int word, bit; |
876 | |
877 | chunkmask = ((1ULL << chunksz) - 1); |
878 | word = i / BITS_PER_LONG; |
879 | bit = i % BITS_PER_LONG; |
880 | val = (bitmap[word] >> bit) & chunkmask; |
881 | |
882 | if (!first) { |
883 | if (buf < end) |
884 | *buf = ','; |
885 | buf++; |
886 | } |
887 | first = false; |
888 | |
889 | spec.field_width = DIV_ROUND_UP(chunksz, 4); |
890 | buf = number(buf, end, val, spec); |
891 | |
892 | chunksz = CHUNKSZ; |
893 | } |
894 | return buf; |
895 | } |
896 | |
897 | static noinline_for_stack |
898 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, |
899 | struct printf_spec spec, const char *fmt) |
900 | { |
901 | int nr_bits = max_t(int, spec.field_width, 0); |
902 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ |
903 | int cur, rbot, rtop; |
904 | bool first = true; |
905 | |
906 | /* reused to print numbers */ |
907 | spec = (struct printf_spec){ .base = 10 }; |
908 | |
909 | rbot = cur = find_first_bit(bitmap, nr_bits); |
910 | while (cur < nr_bits) { |
911 | rtop = cur; |
912 | cur = find_next_bit(bitmap, nr_bits, cur + 1); |
913 | if (cur < nr_bits && cur <= rtop + 1) |
914 | continue; |
915 | |
916 | if (!first) { |
917 | if (buf < end) |
918 | *buf = ','; |
919 | buf++; |
920 | } |
921 | first = false; |
922 | |
923 | buf = number(buf, end, rbot, spec); |
924 | if (rbot < rtop) { |
925 | if (buf < end) |
926 | *buf = '-'; |
927 | buf++; |
928 | |
929 | buf = number(buf, end, rtop, spec); |
930 | } |
931 | |
932 | rbot = cur; |
933 | } |
934 | return buf; |
935 | } |
936 | |
937 | static noinline_for_stack |
938 | char *mac_address_string(char *buf, char *end, u8 *addr, |
939 | struct printf_spec spec, const char *fmt) |
940 | { |
941 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
942 | char *p = mac_addr; |
943 | int i; |
944 | char separator; |
945 | bool reversed = false; |
946 | |
947 | switch (fmt[1]) { |
948 | case 'F': |
949 | separator = '-'; |
950 | break; |
951 | |
952 | case 'R': |
953 | reversed = true; |
954 | /* fall through */ |
955 | |
956 | default: |
957 | separator = ':'; |
958 | break; |
959 | } |
960 | |
961 | for (i = 0; i < 6; i++) { |
962 | if (reversed) |
963 | p = hex_byte_pack(p, addr[5 - i]); |
964 | else |
965 | p = hex_byte_pack(p, addr[i]); |
966 | |
967 | if (fmt[0] == 'M' && i != 5) |
968 | *p++ = separator; |
969 | } |
970 | *p = '\0'; |
971 | |
972 | return string(buf, end, mac_addr, spec); |
973 | } |
974 | |
975 | static noinline_for_stack |
976 | char *ip4_string(char *p, const u8 *addr, const char *fmt) |
977 | { |
978 | int i; |
979 | bool leading_zeros = (fmt[0] == 'i'); |
980 | int index; |
981 | int step; |
982 | |
983 | switch (fmt[2]) { |
984 | case 'h': |
985 | #ifdef __BIG_ENDIAN |
986 | index = 0; |
987 | step = 1; |
988 | #else |
989 | index = 3; |
990 | step = -1; |
991 | #endif |
992 | break; |
993 | case 'l': |
994 | index = 3; |
995 | step = -1; |
996 | break; |
997 | case 'n': |
998 | case 'b': |
999 | default: |
1000 | index = 0; |
1001 | step = 1; |
1002 | break; |
1003 | } |
1004 | for (i = 0; i < 4; i++) { |
1005 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ |
1006 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
1007 | if (leading_zeros) { |
1008 | if (digits < 3) |
1009 | *p++ = '0'; |
1010 | if (digits < 2) |
1011 | *p++ = '0'; |
1012 | } |
1013 | /* reverse the digits in the quad */ |
1014 | while (digits--) |
1015 | *p++ = temp[digits]; |
1016 | if (i < 3) |
1017 | *p++ = '.'; |
1018 | index += step; |
1019 | } |
1020 | *p = '\0'; |
1021 | |
1022 | return p; |
1023 | } |
1024 | |
1025 | static noinline_for_stack |
1026 | char *ip6_compressed_string(char *p, const char *addr) |
1027 | { |
1028 | int i, j, range; |
1029 | unsigned char zerolength[8]; |
1030 | int longest = 1; |
1031 | int colonpos = -1; |
1032 | u16 word; |
1033 | u8 hi, lo; |
1034 | bool needcolon = false; |
1035 | bool useIPv4; |
1036 | struct in6_addr in6; |
1037 | |
1038 | memcpy(&in6, addr, sizeof(struct in6_addr)); |
1039 | |
1040 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); |
1041 | |
1042 | memset(zerolength, 0, sizeof(zerolength)); |
1043 | |
1044 | if (useIPv4) |
1045 | range = 6; |
1046 | else |
1047 | range = 8; |
1048 | |
1049 | /* find position of longest 0 run */ |
1050 | for (i = 0; i < range; i++) { |
1051 | for (j = i; j < range; j++) { |
1052 | if (in6.s6_addr16[j] != 0) |
1053 | break; |
1054 | zerolength[i]++; |
1055 | } |
1056 | } |
1057 | for (i = 0; i < range; i++) { |
1058 | if (zerolength[i] > longest) { |
1059 | longest = zerolength[i]; |
1060 | colonpos = i; |
1061 | } |
1062 | } |
1063 | if (longest == 1) /* don't compress a single 0 */ |
1064 | colonpos = -1; |
1065 | |
1066 | /* emit address */ |
1067 | for (i = 0; i < range; i++) { |
1068 | if (i == colonpos) { |
1069 | if (needcolon || i == 0) |
1070 | *p++ = ':'; |
1071 | *p++ = ':'; |
1072 | needcolon = false; |
1073 | i += longest - 1; |
1074 | continue; |
1075 | } |
1076 | if (needcolon) { |
1077 | *p++ = ':'; |
1078 | needcolon = false; |
1079 | } |
1080 | /* hex u16 without leading 0s */ |
1081 | word = ntohs(in6.s6_addr16[i]); |
1082 | hi = word >> 8; |
1083 | lo = word & 0xff; |
1084 | if (hi) { |
1085 | if (hi > 0x0f) |
1086 | p = hex_byte_pack(p, hi); |
1087 | else |
1088 | *p++ = hex_asc_lo(hi); |
1089 | p = hex_byte_pack(p, lo); |
1090 | } |
1091 | else if (lo > 0x0f) |
1092 | p = hex_byte_pack(p, lo); |
1093 | else |
1094 | *p++ = hex_asc_lo(lo); |
1095 | needcolon = true; |
1096 | } |
1097 | |
1098 | if (useIPv4) { |
1099 | if (needcolon) |
1100 | *p++ = ':'; |
1101 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
1102 | } |
1103 | *p = '\0'; |
1104 | |
1105 | return p; |
1106 | } |
1107 | |
1108 | static noinline_for_stack |
1109 | char *ip6_string(char *p, const char *addr, const char *fmt) |
1110 | { |
1111 | int i; |
1112 | |
1113 | for (i = 0; i < 8; i++) { |
1114 | p = hex_byte_pack(p, *addr++); |
1115 | p = hex_byte_pack(p, *addr++); |
1116 | if (fmt[0] == 'I' && i != 7) |
1117 | *p++ = ':'; |
1118 | } |
1119 | *p = '\0'; |
1120 | |
1121 | return p; |
1122 | } |
1123 | |
1124 | static noinline_for_stack |
1125 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, |
1126 | struct printf_spec spec, const char *fmt) |
1127 | { |
1128 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; |
1129 | |
1130 | if (fmt[0] == 'I' && fmt[2] == 'c') |
1131 | ip6_compressed_string(ip6_addr, addr); |
1132 | else |
1133 | ip6_string(ip6_addr, addr, fmt); |
1134 | |
1135 | return string(buf, end, ip6_addr, spec); |
1136 | } |
1137 | |
1138 | static noinline_for_stack |
1139 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
1140 | struct printf_spec spec, const char *fmt) |
1141 | { |
1142 | char ip4_addr[sizeof("255.255.255.255")]; |
1143 | |
1144 | ip4_string(ip4_addr, addr, fmt); |
1145 | |
1146 | return string(buf, end, ip4_addr, spec); |
1147 | } |
1148 | |
1149 | static noinline_for_stack |
1150 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, |
1151 | struct printf_spec spec, const char *fmt) |
1152 | { |
1153 | bool have_p = false, have_s = false, have_f = false, have_c = false; |
1154 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + |
1155 | sizeof(":12345") + sizeof("/123456789") + |
1156 | sizeof("%1234567890")]; |
1157 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); |
1158 | const u8 *addr = (const u8 *) &sa->sin6_addr; |
1159 | char fmt6[2] = { fmt[0], '6' }; |
1160 | u8 off = 0; |
1161 | |
1162 | fmt++; |
1163 | while (isalpha(*++fmt)) { |
1164 | switch (*fmt) { |
1165 | case 'p': |
1166 | have_p = true; |
1167 | break; |
1168 | case 'f': |
1169 | have_f = true; |
1170 | break; |
1171 | case 's': |
1172 | have_s = true; |
1173 | break; |
1174 | case 'c': |
1175 | have_c = true; |
1176 | break; |
1177 | } |
1178 | } |
1179 | |
1180 | if (have_p || have_s || have_f) { |
1181 | *p = '['; |
1182 | off = 1; |
1183 | } |
1184 | |
1185 | if (fmt6[0] == 'I' && have_c) |
1186 | p = ip6_compressed_string(ip6_addr + off, addr); |
1187 | else |
1188 | p = ip6_string(ip6_addr + off, addr, fmt6); |
1189 | |
1190 | if (have_p || have_s || have_f) |
1191 | *p++ = ']'; |
1192 | |
1193 | if (have_p) { |
1194 | *p++ = ':'; |
1195 | p = number(p, pend, ntohs(sa->sin6_port), spec); |
1196 | } |
1197 | if (have_f) { |
1198 | *p++ = '/'; |
1199 | p = number(p, pend, ntohl(sa->sin6_flowinfo & |
1200 | IPV6_FLOWINFO_MASK), spec); |
1201 | } |
1202 | if (have_s) { |
1203 | *p++ = '%'; |
1204 | p = number(p, pend, sa->sin6_scope_id, spec); |
1205 | } |
1206 | *p = '\0'; |
1207 | |
1208 | return string(buf, end, ip6_addr, spec); |
1209 | } |
1210 | |
1211 | static noinline_for_stack |
1212 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, |
1213 | struct printf_spec spec, const char *fmt) |
1214 | { |
1215 | bool have_p = false; |
1216 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; |
1217 | char *pend = ip4_addr + sizeof(ip4_addr); |
1218 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; |
1219 | char fmt4[3] = { fmt[0], '4', 0 }; |
1220 | |
1221 | fmt++; |
1222 | while (isalpha(*++fmt)) { |
1223 | switch (*fmt) { |
1224 | case 'p': |
1225 | have_p = true; |
1226 | break; |
1227 | case 'h': |
1228 | case 'l': |
1229 | case 'n': |
1230 | case 'b': |
1231 | fmt4[2] = *fmt; |
1232 | break; |
1233 | } |
1234 | } |
1235 | |
1236 | p = ip4_string(ip4_addr, addr, fmt4); |
1237 | if (have_p) { |
1238 | *p++ = ':'; |
1239 | p = number(p, pend, ntohs(sa->sin_port), spec); |
1240 | } |
1241 | *p = '\0'; |
1242 | |
1243 | return string(buf, end, ip4_addr, spec); |
1244 | } |
1245 | |
1246 | static noinline_for_stack |
1247 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, |
1248 | const char *fmt) |
1249 | { |
1250 | bool found = true; |
1251 | int count = 1; |
1252 | unsigned int flags = 0; |
1253 | int len; |
1254 | |
1255 | if (spec.field_width == 0) |
1256 | return buf; /* nothing to print */ |
1257 | |
1258 | if (ZERO_OR_NULL_PTR(addr)) |
1259 | return string(buf, end, NULL, spec); /* NULL pointer */ |
1260 | |
1261 | |
1262 | do { |
1263 | switch (fmt[count++]) { |
1264 | case 'a': |
1265 | flags |= ESCAPE_ANY; |
1266 | break; |
1267 | case 'c': |
1268 | flags |= ESCAPE_SPECIAL; |
1269 | break; |
1270 | case 'h': |
1271 | flags |= ESCAPE_HEX; |
1272 | break; |
1273 | case 'n': |
1274 | flags |= ESCAPE_NULL; |
1275 | break; |
1276 | case 'o': |
1277 | flags |= ESCAPE_OCTAL; |
1278 | break; |
1279 | case 'p': |
1280 | flags |= ESCAPE_NP; |
1281 | break; |
1282 | case 's': |
1283 | flags |= ESCAPE_SPACE; |
1284 | break; |
1285 | default: |
1286 | found = false; |
1287 | break; |
1288 | } |
1289 | } while (found); |
1290 | |
1291 | if (!flags) |
1292 | flags = ESCAPE_ANY_NP; |
1293 | |
1294 | len = spec.field_width < 0 ? 1 : spec.field_width; |
1295 | |
1296 | /* |
1297 | * string_escape_mem() writes as many characters as it can to |
1298 | * the given buffer, and returns the total size of the output |
1299 | * had the buffer been big enough. |
1300 | */ |
1301 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); |
1302 | |
1303 | return buf; |
1304 | } |
1305 | |
1306 | static noinline_for_stack |
1307 | char *uuid_string(char *buf, char *end, const u8 *addr, |
1308 | struct printf_spec spec, const char *fmt) |
1309 | { |
1310 | char uuid[UUID_STRING_LEN + 1]; |
1311 | char *p = uuid; |
1312 | int i; |
1313 | const u8 *index = uuid_be_index; |
1314 | bool uc = false; |
1315 | |
1316 | switch (*(++fmt)) { |
1317 | case 'L': |
1318 | uc = true; /* fall-through */ |
1319 | case 'l': |
1320 | index = uuid_le_index; |
1321 | break; |
1322 | case 'B': |
1323 | uc = true; |
1324 | break; |
1325 | } |
1326 | |
1327 | for (i = 0; i < 16; i++) { |
1328 | if (uc) |
1329 | p = hex_byte_pack_upper(p, addr[index[i]]); |
1330 | else |
1331 | p = hex_byte_pack(p, addr[index[i]]); |
1332 | switch (i) { |
1333 | case 3: |
1334 | case 5: |
1335 | case 7: |
1336 | case 9: |
1337 | *p++ = '-'; |
1338 | break; |
1339 | } |
1340 | } |
1341 | |
1342 | *p = 0; |
1343 | |
1344 | return string(buf, end, uuid, spec); |
1345 | } |
1346 | |
1347 | int kptr_restrict __read_mostly; |
1348 | |
1349 | static noinline_for_stack |
1350 | char *restricted_pointer(char *buf, char *end, const void *ptr, |
1351 | struct printf_spec spec) |
1352 | { |
1353 | spec.base = 16; |
1354 | spec.flags |= SMALL; |
1355 | if (spec.field_width == -1) { |
1356 | spec.field_width = 2 * sizeof(ptr); |
1357 | spec.flags |= ZEROPAD; |
1358 | } |
1359 | |
1360 | switch (kptr_restrict) { |
1361 | case 0: |
1362 | /* Always print %pK values */ |
1363 | break; |
1364 | case 1: { |
1365 | const struct cred *cred; |
1366 | |
1367 | /* |
1368 | * kptr_restrict==1 cannot be used in IRQ context |
1369 | * because its test for CAP_SYSLOG would be meaningless. |
1370 | */ |
1371 | if (in_irq() || in_serving_softirq() || in_nmi()) |
1372 | return string(buf, end, "pK-error", spec); |
1373 | |
1374 | /* |
1375 | * Only print the real pointer value if the current |
1376 | * process has CAP_SYSLOG and is running with the |
1377 | * same credentials it started with. This is because |
1378 | * access to files is checked at open() time, but %pK |
1379 | * checks permission at read() time. We don't want to |
1380 | * leak pointer values if a binary opens a file using |
1381 | * %pK and then elevates privileges before reading it. |
1382 | */ |
1383 | cred = current_cred(); |
1384 | if (!has_capability_noaudit(current, CAP_SYSLOG) || |
1385 | !uid_eq(cred->euid, cred->uid) || |
1386 | !gid_eq(cred->egid, cred->gid)) |
1387 | ptr = NULL; |
1388 | break; |
1389 | } |
1390 | case 2: |
1391 | default: |
1392 | /* Always print 0's for %pK */ |
1393 | ptr = NULL; |
1394 | break; |
1395 | } |
1396 | |
1397 | return number(buf, end, (unsigned long)ptr, spec); |
1398 | } |
1399 | |
1400 | static noinline_for_stack |
1401 | char *netdev_bits(char *buf, char *end, const void *addr, const char *fmt) |
1402 | { |
1403 | unsigned long long num; |
1404 | int size; |
1405 | |
1406 | switch (fmt[1]) { |
1407 | case 'F': |
1408 | num = *(const netdev_features_t *)addr; |
1409 | size = sizeof(netdev_features_t); |
1410 | break; |
1411 | default: |
1412 | num = (unsigned long)addr; |
1413 | size = sizeof(unsigned long); |
1414 | break; |
1415 | } |
1416 | |
1417 | return special_hex_number(buf, end, num, size); |
1418 | } |
1419 | |
1420 | static noinline_for_stack |
1421 | char *address_val(char *buf, char *end, const void *addr, const char *fmt) |
1422 | { |
1423 | unsigned long long num; |
1424 | int size; |
1425 | |
1426 | switch (fmt[1]) { |
1427 | case 'd': |
1428 | num = *(const dma_addr_t *)addr; |
1429 | size = sizeof(dma_addr_t); |
1430 | break; |
1431 | case 'p': |
1432 | default: |
1433 | num = *(const phys_addr_t *)addr; |
1434 | size = sizeof(phys_addr_t); |
1435 | break; |
1436 | } |
1437 | |
1438 | return special_hex_number(buf, end, num, size); |
1439 | } |
1440 | |
1441 | static noinline_for_stack |
1442 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, |
1443 | const char *fmt) |
1444 | { |
1445 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk) |
1446 | return string(buf, end, NULL, spec); |
1447 | |
1448 | switch (fmt[1]) { |
1449 | case 'n': |
1450 | default: |
1451 | #ifdef CONFIG_COMMON_CLK |
1452 | return string(buf, end, __clk_get_name(clk), spec); |
1453 | #else |
1454 | return special_hex_number(buf, end, (unsigned long)clk, sizeof(unsigned long)); |
1455 | #endif |
1456 | } |
1457 | } |
1458 | |
1459 | static |
1460 | char *format_flags(char *buf, char *end, unsigned long flags, |
1461 | const struct trace_print_flags *names) |
1462 | { |
1463 | unsigned long mask; |
1464 | const struct printf_spec strspec = { |
1465 | .field_width = -1, |
1466 | .precision = -1, |
1467 | }; |
1468 | const struct printf_spec numspec = { |
1469 | .flags = SPECIAL|SMALL, |
1470 | .field_width = -1, |
1471 | .precision = -1, |
1472 | .base = 16, |
1473 | }; |
1474 | |
1475 | for ( ; flags && names->name; names++) { |
1476 | mask = names->mask; |
1477 | if ((flags & mask) != mask) |
1478 | continue; |
1479 | |
1480 | buf = string(buf, end, names->name, strspec); |
1481 | |
1482 | flags &= ~mask; |
1483 | if (flags) { |
1484 | if (buf < end) |
1485 | *buf = '|'; |
1486 | buf++; |
1487 | } |
1488 | } |
1489 | |
1490 | if (flags) |
1491 | buf = number(buf, end, flags, numspec); |
1492 | |
1493 | return buf; |
1494 | } |
1495 | |
1496 | static noinline_for_stack |
1497 | char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt) |
1498 | { |
1499 | unsigned long flags; |
1500 | const struct trace_print_flags *names; |
1501 | |
1502 | switch (fmt[1]) { |
1503 | case 'p': |
1504 | flags = *(unsigned long *)flags_ptr; |
1505 | /* Remove zone id */ |
1506 | flags &= (1UL << NR_PAGEFLAGS) - 1; |
1507 | names = pageflag_names; |
1508 | break; |
1509 | case 'v': |
1510 | flags = *(unsigned long *)flags_ptr; |
1511 | names = vmaflag_names; |
1512 | break; |
1513 | case 'g': |
1514 | flags = *(gfp_t *)flags_ptr; |
1515 | names = gfpflag_names; |
1516 | break; |
1517 | default: |
1518 | WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]); |
1519 | return buf; |
1520 | } |
1521 | |
1522 | return format_flags(buf, end, flags, names); |
1523 | } |
1524 | |
1525 | static noinline_for_stack |
1526 | char *pointer_string(char *buf, char *end, const void *ptr, |
1527 | struct printf_spec spec) |
1528 | { |
1529 | spec.base = 16; |
1530 | spec.flags |= SMALL; |
1531 | if (spec.field_width == -1) { |
1532 | spec.field_width = 2 * sizeof(ptr); |
1533 | spec.flags |= ZEROPAD; |
1534 | } |
1535 | |
1536 | return number(buf, end, (unsigned long int)ptr, spec); |
1537 | } |
1538 | |
1539 | static bool have_filled_random_ptr_key __read_mostly; |
1540 | static siphash_key_t ptr_key __read_mostly; |
1541 | |
1542 | static void fill_random_ptr_key(struct random_ready_callback *unused) |
1543 | { |
1544 | get_random_bytes(&ptr_key, sizeof(ptr_key)); |
1545 | /* |
1546 | * have_filled_random_ptr_key==true is dependent on get_random_bytes(). |
1547 | * ptr_to_id() needs to see have_filled_random_ptr_key==true |
1548 | * after get_random_bytes() returns. |
1549 | */ |
1550 | smp_mb(); |
1551 | WRITE_ONCE(have_filled_random_ptr_key, true); |
1552 | } |
1553 | |
1554 | static struct random_ready_callback random_ready = { |
1555 | .func = fill_random_ptr_key |
1556 | }; |
1557 | |
1558 | static int __init initialize_ptr_random(void) |
1559 | { |
1560 | int ret = add_random_ready_callback(&random_ready); |
1561 | |
1562 | if (!ret) { |
1563 | return 0; |
1564 | } else if (ret == -EALREADY) { |
1565 | fill_random_ptr_key(&random_ready); |
1566 | return 0; |
1567 | } |
1568 | |
1569 | return ret; |
1570 | } |
1571 | early_initcall(initialize_ptr_random); |
1572 | |
1573 | /* Maps a pointer to a 32 bit unique identifier. */ |
1574 | static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec) |
1575 | { |
1576 | unsigned long hashval; |
1577 | const int default_width = 2 * sizeof(ptr); |
1578 | |
1579 | if (unlikely(!have_filled_random_ptr_key)) { |
1580 | spec.field_width = default_width; |
1581 | /* string length must be less than default_width */ |
1582 | return string(buf, end, "(ptrval)", spec); |
1583 | } |
1584 | |
1585 | #ifdef CONFIG_64BIT |
1586 | hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key); |
1587 | /* |
1588 | * Mask off the first 32 bits, this makes explicit that we have |
1589 | * modified the address (and 32 bits is plenty for a unique ID). |
1590 | */ |
1591 | hashval = hashval & 0xffffffff; |
1592 | #else |
1593 | hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key); |
1594 | #endif |
1595 | |
1596 | spec.flags |= SMALL; |
1597 | if (spec.field_width == -1) { |
1598 | spec.field_width = default_width; |
1599 | spec.flags |= ZEROPAD; |
1600 | } |
1601 | spec.base = 16; |
1602 | |
1603 | return number(buf, end, hashval, spec); |
1604 | } |
1605 | |
1606 | /* |
1607 | * Show a '%p' thing. A kernel extension is that the '%p' is followed |
1608 | * by an extra set of alphanumeric characters that are extended format |
1609 | * specifiers. |
1610 | * |
1611 | * Right now we handle: |
1612 | * |
1613 | * - 'F' For symbolic function descriptor pointers with offset |
1614 | * - 'f' For simple symbolic function names without offset |
1615 | * - 'S' For symbolic direct pointers with offset |
1616 | * - 's' For symbolic direct pointers without offset |
1617 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
1618 | * - 'B' For backtraced symbolic direct pointers with offset |
1619 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1620 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] |
1621 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
1622 | * width which must be explicitly specified either as part of the |
1623 | * format string '%32b[l]' or through '%*b[l]', [l] selects |
1624 | * range-list format instead of hex format |
1625 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1626 | * usual colon-separated hex notation |
1627 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
1628 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
1629 | * with a dash-separated hex notation |
1630 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
1631 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1632 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) |
1633 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's |
1634 | * [S][pfs] |
1635 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to |
1636 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] |
1637 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1638 | * IPv6 omits the colons (01020304...0f) |
1639 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) |
1640 | * [S][pfs] |
1641 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to |
1642 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] |
1643 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order |
1644 | * - 'I[6S]c' for IPv6 addresses printed as specified by |
1645 | * http://tools.ietf.org/html/rfc5952 |
1646 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
1647 | * of the following flags (see string_escape_mem() for the |
1648 | * details): |
1649 | * a - ESCAPE_ANY |
1650 | * c - ESCAPE_SPECIAL |
1651 | * h - ESCAPE_HEX |
1652 | * n - ESCAPE_NULL |
1653 | * o - ESCAPE_OCTAL |
1654 | * p - ESCAPE_NP |
1655 | * s - ESCAPE_SPACE |
1656 | * By default ESCAPE_ANY_NP is used. |
1657 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1658 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" |
1659 | * Options for %pU are: |
1660 | * b big endian lower case hex (default) |
1661 | * B big endian UPPER case hex |
1662 | * l little endian lower case hex |
1663 | * L little endian UPPER case hex |
1664 | * big endian output byte order is: |
1665 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] |
1666 | * little endian output byte order is: |
1667 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] |
1668 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1669 | * call vsnprintf(->format, *->va_list). |
1670 | * Implements a "recursive vsnprintf". |
1671 | * Do not use this feature without some mechanism to verify the |
1672 | * correctness of the format string and va_list arguments. |
1673 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
1674 | * - 'NF' For a netdev_features_t |
1675 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1676 | * a certain separator (' ' by default): |
1677 | * C colon |
1678 | * D dash |
1679 | * N no separator |
1680 | * The maximum supported length is 64 bytes of the input. Consider |
1681 | * to use print_hex_dump() for the larger input. |
1682 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1683 | * (default assumed to be phys_addr_t, passed by reference) |
1684 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1685 | * - 'D[234]' Same as 'd' but for a struct file |
1686 | * - 'g' For block_device name (gendisk + partition number) |
1687 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
1688 | * (legacy clock framework) of the clock |
1689 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address |
1690 | * (legacy clock framework) of the clock |
1691 | * - 'Cr' For a clock, it prints the current rate of the clock |
1692 | * - 'G' For flags to be printed as a collection of symbolic strings that would |
1693 | * construct the specific value. Supported flags given by option: |
1694 | * p page flags (see struct page) given as pointer to unsigned long |
1695 | * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t |
1696 | * v vma flags (VM_*) given as pointer to unsigned long |
1697 | * |
1698 | * - 'x' For printing the address. Equivalent to "%lx". |
1699 | * |
1700 | * ** Please update also Documentation/printk-formats.txt when making changes ** |
1701 | * |
1702 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1703 | * function pointers are really function descriptors, which contain a |
1704 | * pointer to the real address. |
1705 | * |
1706 | * Note: The default behaviour (unadorned %p) is to hash the address, |
1707 | * rendering it useful as a unique identifier. |
1708 | */ |
1709 | static noinline_for_stack |
1710 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
1711 | struct printf_spec spec) |
1712 | { |
1713 | const int default_width = 2 * sizeof(void *); |
1714 | |
1715 | if (!ptr && *fmt != 'K') { |
1716 | /* |
1717 | * Print (null) with the same width as a pointer so it makes |
1718 | * tabular output look nice. |
1719 | */ |
1720 | if (spec.field_width == -1) |
1721 | spec.field_width = default_width; |
1722 | return string(buf, end, "(null)", spec); |
1723 | } |
1724 | |
1725 | switch (*fmt) { |
1726 | case 'F': |
1727 | case 'f': |
1728 | ptr = dereference_function_descriptor(ptr); |
1729 | /* Fallthrough */ |
1730 | case 'S': |
1731 | case 's': |
1732 | case 'B': |
1733 | return symbol_string(buf, end, ptr, spec, fmt); |
1734 | case 'R': |
1735 | case 'r': |
1736 | return resource_string(buf, end, ptr, spec, fmt); |
1737 | case 'h': |
1738 | return hex_string(buf, end, ptr, spec, fmt); |
1739 | case 'b': |
1740 | switch (fmt[1]) { |
1741 | case 'l': |
1742 | return bitmap_list_string(buf, end, ptr, spec, fmt); |
1743 | default: |
1744 | return bitmap_string(buf, end, ptr, spec, fmt); |
1745 | } |
1746 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1747 | case 'm': /* Contiguous: 000102030405 */ |
1748 | /* [mM]F (FDDI) */ |
1749 | /* [mM]R (Reverse order; Bluetooth) */ |
1750 | return mac_address_string(buf, end, ptr, spec, fmt); |
1751 | case 'I': /* Formatted IP supported |
1752 | * 4: 1.2.3.4 |
1753 | * 6: 0001:0203:...:0708 |
1754 | * 6c: 1::708 or 1::1.2.3.4 |
1755 | */ |
1756 | case 'i': /* Contiguous: |
1757 | * 4: 001.002.003.004 |
1758 | * 6: 000102...0f |
1759 | */ |
1760 | switch (fmt[1]) { |
1761 | case '6': |
1762 | return ip6_addr_string(buf, end, ptr, spec, fmt); |
1763 | case '4': |
1764 | return ip4_addr_string(buf, end, ptr, spec, fmt); |
1765 | case 'S': { |
1766 | const union { |
1767 | struct sockaddr raw; |
1768 | struct sockaddr_in v4; |
1769 | struct sockaddr_in6 v6; |
1770 | } *sa = ptr; |
1771 | |
1772 | switch (sa->raw.sa_family) { |
1773 | case AF_INET: |
1774 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); |
1775 | case AF_INET6: |
1776 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); |
1777 | default: |
1778 | return string(buf, end, "(invalid address)", spec); |
1779 | }} |
1780 | } |
1781 | break; |
1782 | case 'E': |
1783 | return escaped_string(buf, end, ptr, spec, fmt); |
1784 | case 'U': |
1785 | return uuid_string(buf, end, ptr, spec, fmt); |
1786 | case 'V': |
1787 | { |
1788 | va_list va; |
1789 | |
1790 | va_copy(va, *((struct va_format *)ptr)->va); |
1791 | buf += vsnprintf(buf, end > buf ? end - buf : 0, |
1792 | ((struct va_format *)ptr)->fmt, va); |
1793 | va_end(va); |
1794 | return buf; |
1795 | } |
1796 | case 'K': |
1797 | return restricted_pointer(buf, end, ptr, spec); |
1798 | case 'N': |
1799 | return netdev_bits(buf, end, ptr, fmt); |
1800 | case 'a': |
1801 | return address_val(buf, end, ptr, fmt); |
1802 | case 'd': |
1803 | return dentry_name(buf, end, ptr, spec, fmt); |
1804 | case 'C': |
1805 | return clock(buf, end, ptr, spec, fmt); |
1806 | case 'D': |
1807 | return dentry_name(buf, end, |
1808 | ((const struct file *)ptr)->f_path.dentry, |
1809 | spec, fmt); |
1810 | #ifdef CONFIG_BLOCK |
1811 | case 'g': |
1812 | return bdev_name(buf, end, ptr, spec, fmt); |
1813 | #endif |
1814 | |
1815 | case 'G': |
1816 | return flags_string(buf, end, ptr, fmt); |
1817 | case 'x': |
1818 | return pointer_string(buf, end, ptr, spec); |
1819 | } |
1820 | |
1821 | /* default is to _not_ leak addresses, hash before printing */ |
1822 | return ptr_to_id(buf, end, ptr, spec); |
1823 | } |
1824 | |
1825 | /* |
1826 | * Helper function to decode printf style format. |
1827 | * Each call decode a token from the format and return the |
1828 | * number of characters read (or likely the delta where it wants |
1829 | * to go on the next call). |
1830 | * The decoded token is returned through the parameters |
1831 | * |
1832 | * 'h', 'l', or 'L' for integer fields |
1833 | * 'z' support added 23/7/1999 S.H. |
1834 | * 'z' changed to 'Z' --davidm 1/25/99 |
1835 | * 't' added for ptrdiff_t |
1836 | * |
1837 | * @fmt: the format string |
1838 | * @type of the token returned |
1839 | * @flags: various flags such as +, -, # tokens.. |
1840 | * @field_width: overwritten width |
1841 | * @base: base of the number (octal, hex, ...) |
1842 | * @precision: precision of a number |
1843 | * @qualifier: qualifier of a number (long, size_t, ...) |
1844 | */ |
1845 | static noinline_for_stack |
1846 | int format_decode(const char *fmt, struct printf_spec *spec) |
1847 | { |
1848 | const char *start = fmt; |
1849 | char qualifier; |
1850 | |
1851 | /* we finished early by reading the field width */ |
1852 | if (spec->type == FORMAT_TYPE_WIDTH) { |
1853 | if (spec->field_width < 0) { |
1854 | spec->field_width = -spec->field_width; |
1855 | spec->flags |= LEFT; |
1856 | } |
1857 | spec->type = FORMAT_TYPE_NONE; |
1858 | goto precision; |
1859 | } |
1860 | |
1861 | /* we finished early by reading the precision */ |
1862 | if (spec->type == FORMAT_TYPE_PRECISION) { |
1863 | if (spec->precision < 0) |
1864 | spec->precision = 0; |
1865 | |
1866 | spec->type = FORMAT_TYPE_NONE; |
1867 | goto qualifier; |
1868 | } |
1869 | |
1870 | /* By default */ |
1871 | spec->type = FORMAT_TYPE_NONE; |
1872 | |
1873 | for (; *fmt ; ++fmt) { |
1874 | if (*fmt == '%') |
1875 | break; |
1876 | } |
1877 | |
1878 | /* Return the current non-format string */ |
1879 | if (fmt != start || !*fmt) |
1880 | return fmt - start; |
1881 | |
1882 | /* Process flags */ |
1883 | spec->flags = 0; |
1884 | |
1885 | while (1) { /* this also skips first '%' */ |
1886 | bool found = true; |
1887 | |
1888 | ++fmt; |
1889 | |
1890 | switch (*fmt) { |
1891 | case '-': spec->flags |= LEFT; break; |
1892 | case '+': spec->flags |= PLUS; break; |
1893 | case ' ': spec->flags |= SPACE; break; |
1894 | case '#': spec->flags |= SPECIAL; break; |
1895 | case '0': spec->flags |= ZEROPAD; break; |
1896 | default: found = false; |
1897 | } |
1898 | |
1899 | if (!found) |
1900 | break; |
1901 | } |
1902 | |
1903 | /* get field width */ |
1904 | spec->field_width = -1; |
1905 | |
1906 | if (isdigit(*fmt)) |
1907 | spec->field_width = skip_atoi(&fmt); |
1908 | else if (*fmt == '*') { |
1909 | /* it's the next argument */ |
1910 | spec->type = FORMAT_TYPE_WIDTH; |
1911 | return ++fmt - start; |
1912 | } |
1913 | |
1914 | precision: |
1915 | /* get the precision */ |
1916 | spec->precision = -1; |
1917 | if (*fmt == '.') { |
1918 | ++fmt; |
1919 | if (isdigit(*fmt)) { |
1920 | spec->precision = skip_atoi(&fmt); |
1921 | if (spec->precision < 0) |
1922 | spec->precision = 0; |
1923 | } else if (*fmt == '*') { |
1924 | /* it's the next argument */ |
1925 | spec->type = FORMAT_TYPE_PRECISION; |
1926 | return ++fmt - start; |
1927 | } |
1928 | } |
1929 | |
1930 | qualifier: |
1931 | /* get the conversion qualifier */ |
1932 | qualifier = 0; |
1933 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1934 | _tolower(*fmt) == 'z' || *fmt == 't') { |
1935 | qualifier = *fmt++; |
1936 | if (unlikely(qualifier == *fmt)) { |
1937 | if (qualifier == 'l') { |
1938 | qualifier = 'L'; |
1939 | ++fmt; |
1940 | } else if (qualifier == 'h') { |
1941 | qualifier = 'H'; |
1942 | ++fmt; |
1943 | } |
1944 | } |
1945 | } |
1946 | |
1947 | /* default base */ |
1948 | spec->base = 10; |
1949 | switch (*fmt) { |
1950 | case 'c': |
1951 | spec->type = FORMAT_TYPE_CHAR; |
1952 | return ++fmt - start; |
1953 | |
1954 | case 's': |
1955 | spec->type = FORMAT_TYPE_STR; |
1956 | return ++fmt - start; |
1957 | |
1958 | case 'p': |
1959 | spec->type = FORMAT_TYPE_PTR; |
1960 | return ++fmt - start; |
1961 | |
1962 | case '%': |
1963 | spec->type = FORMAT_TYPE_PERCENT_CHAR; |
1964 | return ++fmt - start; |
1965 | |
1966 | /* integer number formats - set up the flags and "break" */ |
1967 | case 'o': |
1968 | spec->base = 8; |
1969 | break; |
1970 | |
1971 | case 'x': |
1972 | spec->flags |= SMALL; |
1973 | |
1974 | case 'X': |
1975 | spec->base = 16; |
1976 | break; |
1977 | |
1978 | case 'd': |
1979 | case 'i': |
1980 | spec->flags |= SIGN; |
1981 | case 'u': |
1982 | break; |
1983 | |
1984 | case 'n': |
1985 | /* |
1986 | * Since %n poses a greater security risk than |
1987 | * utility, treat it as any other invalid or |
1988 | * unsupported format specifier. |
1989 | */ |
1990 | /* Fall-through */ |
1991 | |
1992 | default: |
1993 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); |
1994 | spec->type = FORMAT_TYPE_INVALID; |
1995 | return fmt - start; |
1996 | } |
1997 | |
1998 | if (qualifier == 'L') |
1999 | spec->type = FORMAT_TYPE_LONG_LONG; |
2000 | else if (qualifier == 'l') { |
2001 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
2002 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); |
2003 | } else if (_tolower(qualifier) == 'z') { |
2004 | spec->type = FORMAT_TYPE_SIZE_T; |
2005 | } else if (qualifier == 't') { |
2006 | spec->type = FORMAT_TYPE_PTRDIFF; |
2007 | } else if (qualifier == 'H') { |
2008 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
2009 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); |
2010 | } else if (qualifier == 'h') { |
2011 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
2012 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); |
2013 | } else { |
2014 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
2015 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); |
2016 | } |
2017 | |
2018 | return ++fmt - start; |
2019 | } |
2020 | |
2021 | static void |
2022 | set_field_width(struct printf_spec *spec, int width) |
2023 | { |
2024 | spec->field_width = width; |
2025 | if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) { |
2026 | spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX); |
2027 | } |
2028 | } |
2029 | |
2030 | static void |
2031 | set_precision(struct printf_spec *spec, int prec) |
2032 | { |
2033 | spec->precision = prec; |
2034 | if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) { |
2035 | spec->precision = clamp(prec, 0, PRECISION_MAX); |
2036 | } |
2037 | } |
2038 | |
2039 | /** |
2040 | * vsnprintf - Format a string and place it in a buffer |
2041 | * @buf: The buffer to place the result into |
2042 | * @size: The size of the buffer, including the trailing null space |
2043 | * @fmt: The format string to use |
2044 | * @args: Arguments for the format string |
2045 | * |
2046 | * This function generally follows C99 vsnprintf, but has some |
2047 | * extensions and a few limitations: |
2048 | * |
2049 | * %n is unsupported |
2050 | * %p* is handled by pointer() |
2051 | * |
2052 | * See pointer() or Documentation/printk-formats.txt for more |
2053 | * extensive description. |
2054 | * |
2055 | * ** Please update the documentation in both places when making changes ** |
2056 | * |
2057 | * The return value is the number of characters which would |
2058 | * be generated for the given input, excluding the trailing |
2059 | * '\0', as per ISO C99. If you want to have the exact |
2060 | * number of characters written into @buf as return value |
2061 | * (not including the trailing '\0'), use vscnprintf(). If the |
2062 | * return is greater than or equal to @size, the resulting |
2063 | * string is truncated. |
2064 | * |
2065 | * If you're not already dealing with a va_list consider using snprintf(). |
2066 | */ |
2067 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
2068 | { |
2069 | unsigned long long num; |
2070 | char *str, *end; |
2071 | struct printf_spec spec = {0}; |
2072 | |
2073 | /* Reject out-of-range values early. Large positive sizes are |
2074 | used for unknown buffer sizes. */ |
2075 | if (WARN_ON_ONCE(size > INT_MAX)) |
2076 | return 0; |
2077 | |
2078 | str = buf; |
2079 | end = buf + size; |
2080 | |
2081 | /* Make sure end is always >= buf */ |
2082 | if (end < buf) { |
2083 | end = ((void *)-1); |
2084 | size = end - buf; |
2085 | } |
2086 | |
2087 | while (*fmt) { |
2088 | const char *old_fmt = fmt; |
2089 | int read = format_decode(fmt, &spec); |
2090 | |
2091 | fmt += read; |
2092 | |
2093 | switch (spec.type) { |
2094 | case FORMAT_TYPE_NONE: { |
2095 | int copy = read; |
2096 | if (str < end) { |
2097 | if (copy > end - str) |
2098 | copy = end - str; |
2099 | memcpy(str, old_fmt, copy); |
2100 | } |
2101 | str += read; |
2102 | break; |
2103 | } |
2104 | |
2105 | case FORMAT_TYPE_WIDTH: |
2106 | set_field_width(&spec, va_arg(args, int)); |
2107 | break; |
2108 | |
2109 | case FORMAT_TYPE_PRECISION: |
2110 | set_precision(&spec, va_arg(args, int)); |
2111 | break; |
2112 | |
2113 | case FORMAT_TYPE_CHAR: { |
2114 | char c; |
2115 | |
2116 | if (!(spec.flags & LEFT)) { |
2117 | while (--spec.field_width > 0) { |
2118 | if (str < end) |
2119 | *str = ' '; |
2120 | ++str; |
2121 | |
2122 | } |
2123 | } |
2124 | c = (unsigned char) va_arg(args, int); |
2125 | if (str < end) |
2126 | *str = c; |
2127 | ++str; |
2128 | while (--spec.field_width > 0) { |
2129 | if (str < end) |
2130 | *str = ' '; |
2131 | ++str; |
2132 | } |
2133 | break; |
2134 | } |
2135 | |
2136 | case FORMAT_TYPE_STR: |
2137 | str = string(str, end, va_arg(args, char *), spec); |
2138 | break; |
2139 | |
2140 | case FORMAT_TYPE_PTR: |
2141 | str = pointer(fmt, str, end, va_arg(args, void *), |
2142 | spec); |
2143 | while (isalnum(*fmt)) |
2144 | fmt++; |
2145 | break; |
2146 | |
2147 | case FORMAT_TYPE_PERCENT_CHAR: |
2148 | if (str < end) |
2149 | *str = '%'; |
2150 | ++str; |
2151 | break; |
2152 | |
2153 | case FORMAT_TYPE_INVALID: |
2154 | /* |
2155 | * Presumably the arguments passed gcc's type |
2156 | * checking, but there is no safe or sane way |
2157 | * for us to continue parsing the format and |
2158 | * fetching from the va_list; the remaining |
2159 | * specifiers and arguments would be out of |
2160 | * sync. |
2161 | */ |
2162 | goto out; |
2163 | |
2164 | default: |
2165 | switch (spec.type) { |
2166 | case FORMAT_TYPE_LONG_LONG: |
2167 | num = va_arg(args, long long); |
2168 | break; |
2169 | case FORMAT_TYPE_ULONG: |
2170 | num = va_arg(args, unsigned long); |
2171 | break; |
2172 | case FORMAT_TYPE_LONG: |
2173 | num = va_arg(args, long); |
2174 | break; |
2175 | case FORMAT_TYPE_SIZE_T: |
2176 | if (spec.flags & SIGN) |
2177 | num = va_arg(args, ssize_t); |
2178 | else |
2179 | num = va_arg(args, size_t); |
2180 | break; |
2181 | case FORMAT_TYPE_PTRDIFF: |
2182 | num = va_arg(args, ptrdiff_t); |
2183 | break; |
2184 | case FORMAT_TYPE_UBYTE: |
2185 | num = (unsigned char) va_arg(args, int); |
2186 | break; |
2187 | case FORMAT_TYPE_BYTE: |
2188 | num = (signed char) va_arg(args, int); |
2189 | break; |
2190 | case FORMAT_TYPE_USHORT: |
2191 | num = (unsigned short) va_arg(args, int); |
2192 | break; |
2193 | case FORMAT_TYPE_SHORT: |
2194 | num = (short) va_arg(args, int); |
2195 | break; |
2196 | case FORMAT_TYPE_INT: |
2197 | num = (int) va_arg(args, int); |
2198 | break; |
2199 | default: |
2200 | num = va_arg(args, unsigned int); |
2201 | } |
2202 | |
2203 | str = number(str, end, num, spec); |
2204 | } |
2205 | } |
2206 | |
2207 | out: |
2208 | if (size > 0) { |
2209 | if (str < end) |
2210 | *str = '\0'; |
2211 | else |
2212 | end[-1] = '\0'; |
2213 | } |
2214 | |
2215 | /* the trailing null byte doesn't count towards the total */ |
2216 | return str-buf; |
2217 | |
2218 | } |
2219 | EXPORT_SYMBOL(vsnprintf); |
2220 | |
2221 | /** |
2222 | * vscnprintf - Format a string and place it in a buffer |
2223 | * @buf: The buffer to place the result into |
2224 | * @size: The size of the buffer, including the trailing null space |
2225 | * @fmt: The format string to use |
2226 | * @args: Arguments for the format string |
2227 | * |
2228 | * The return value is the number of characters which have been written into |
2229 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
2230 | * returns 0. |
2231 | * |
2232 | * If you're not already dealing with a va_list consider using scnprintf(). |
2233 | * |
2234 | * See the vsnprintf() documentation for format string extensions over C99. |
2235 | */ |
2236 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
2237 | { |
2238 | int i; |
2239 | |
2240 | i = vsnprintf(buf, size, fmt, args); |
2241 | |
2242 | if (likely(i < size)) |
2243 | return i; |
2244 | if (size != 0) |
2245 | return size - 1; |
2246 | return 0; |
2247 | } |
2248 | EXPORT_SYMBOL(vscnprintf); |
2249 | |
2250 | /** |
2251 | * snprintf - Format a string and place it in a buffer |
2252 | * @buf: The buffer to place the result into |
2253 | * @size: The size of the buffer, including the trailing null space |
2254 | * @fmt: The format string to use |
2255 | * @...: Arguments for the format string |
2256 | * |
2257 | * The return value is the number of characters which would be |
2258 | * generated for the given input, excluding the trailing null, |
2259 | * as per ISO C99. If the return is greater than or equal to |
2260 | * @size, the resulting string is truncated. |
2261 | * |
2262 | * See the vsnprintf() documentation for format string extensions over C99. |
2263 | */ |
2264 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
2265 | { |
2266 | va_list args; |
2267 | int i; |
2268 | |
2269 | va_start(args, fmt); |
2270 | i = vsnprintf(buf, size, fmt, args); |
2271 | va_end(args); |
2272 | |
2273 | return i; |
2274 | } |
2275 | EXPORT_SYMBOL(snprintf); |
2276 | |
2277 | /** |
2278 | * scnprintf - Format a string and place it in a buffer |
2279 | * @buf: The buffer to place the result into |
2280 | * @size: The size of the buffer, including the trailing null space |
2281 | * @fmt: The format string to use |
2282 | * @...: Arguments for the format string |
2283 | * |
2284 | * The return value is the number of characters written into @buf not including |
2285 | * the trailing '\0'. If @size is == 0 the function returns 0. |
2286 | */ |
2287 | |
2288 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
2289 | { |
2290 | va_list args; |
2291 | int i; |
2292 | |
2293 | va_start(args, fmt); |
2294 | i = vscnprintf(buf, size, fmt, args); |
2295 | va_end(args); |
2296 | |
2297 | return i; |
2298 | } |
2299 | EXPORT_SYMBOL(scnprintf); |
2300 | |
2301 | /** |
2302 | * vsprintf - Format a string and place it in a buffer |
2303 | * @buf: The buffer to place the result into |
2304 | * @fmt: The format string to use |
2305 | * @args: Arguments for the format string |
2306 | * |
2307 | * The function returns the number of characters written |
2308 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
2309 | * buffer overflows. |
2310 | * |
2311 | * If you're not already dealing with a va_list consider using sprintf(). |
2312 | * |
2313 | * See the vsnprintf() documentation for format string extensions over C99. |
2314 | */ |
2315 | int vsprintf(char *buf, const char *fmt, va_list args) |
2316 | { |
2317 | return vsnprintf(buf, INT_MAX, fmt, args); |
2318 | } |
2319 | EXPORT_SYMBOL(vsprintf); |
2320 | |
2321 | /** |
2322 | * sprintf - Format a string and place it in a buffer |
2323 | * @buf: The buffer to place the result into |
2324 | * @fmt: The format string to use |
2325 | * @...: Arguments for the format string |
2326 | * |
2327 | * The function returns the number of characters written |
2328 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
2329 | * buffer overflows. |
2330 | * |
2331 | * See the vsnprintf() documentation for format string extensions over C99. |
2332 | */ |
2333 | int sprintf(char *buf, const char *fmt, ...) |
2334 | { |
2335 | va_list args; |
2336 | int i; |
2337 | |
2338 | va_start(args, fmt); |
2339 | i = vsnprintf(buf, INT_MAX, fmt, args); |
2340 | va_end(args); |
2341 | |
2342 | return i; |
2343 | } |
2344 | EXPORT_SYMBOL(sprintf); |
2345 | |
2346 | #ifdef CONFIG_BINARY_PRINTF |
2347 | /* |
2348 | * bprintf service: |
2349 | * vbin_printf() - VA arguments to binary data |
2350 | * bstr_printf() - Binary data to text string |
2351 | */ |
2352 | |
2353 | /** |
2354 | * vbin_printf - Parse a format string and place args' binary value in a buffer |
2355 | * @bin_buf: The buffer to place args' binary value |
2356 | * @size: The size of the buffer(by words(32bits), not characters) |
2357 | * @fmt: The format string to use |
2358 | * @args: Arguments for the format string |
2359 | * |
2360 | * The format follows C99 vsnprintf, except %n is ignored, and its argument |
2361 | * is skipped. |
2362 | * |
2363 | * The return value is the number of words(32bits) which would be generated for |
2364 | * the given input. |
2365 | * |
2366 | * NOTE: |
2367 | * If the return value is greater than @size, the resulting bin_buf is NOT |
2368 | * valid for bstr_printf(). |
2369 | */ |
2370 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) |
2371 | { |
2372 | struct printf_spec spec = {0}; |
2373 | char *str, *end; |
2374 | |
2375 | str = (char *)bin_buf; |
2376 | end = (char *)(bin_buf + size); |
2377 | |
2378 | #define save_arg(type) \ |
2379 | do { \ |
2380 | if (sizeof(type) == 8) { \ |
2381 | unsigned long long value; \ |
2382 | str = PTR_ALIGN(str, sizeof(u32)); \ |
2383 | value = va_arg(args, unsigned long long); \ |
2384 | if (str + sizeof(type) <= end) { \ |
2385 | *(u32 *)str = *(u32 *)&value; \ |
2386 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ |
2387 | } \ |
2388 | } else { \ |
2389 | unsigned long value; \ |
2390 | str = PTR_ALIGN(str, sizeof(type)); \ |
2391 | value = va_arg(args, int); \ |
2392 | if (str + sizeof(type) <= end) \ |
2393 | *(typeof(type) *)str = (type)value; \ |
2394 | } \ |
2395 | str += sizeof(type); \ |
2396 | } while (0) |
2397 | |
2398 | while (*fmt) { |
2399 | int read = format_decode(fmt, &spec); |
2400 | |
2401 | fmt += read; |
2402 | |
2403 | switch (spec.type) { |
2404 | case FORMAT_TYPE_NONE: |
2405 | case FORMAT_TYPE_PERCENT_CHAR: |
2406 | break; |
2407 | case FORMAT_TYPE_INVALID: |
2408 | goto out; |
2409 | |
2410 | case FORMAT_TYPE_WIDTH: |
2411 | case FORMAT_TYPE_PRECISION: |
2412 | save_arg(int); |
2413 | break; |
2414 | |
2415 | case FORMAT_TYPE_CHAR: |
2416 | save_arg(char); |
2417 | break; |
2418 | |
2419 | case FORMAT_TYPE_STR: { |
2420 | const char *save_str = va_arg(args, char *); |
2421 | size_t len; |
2422 | |
2423 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2424 | || (unsigned long)save_str < PAGE_SIZE) |
2425 | save_str = "(null)"; |
2426 | len = strlen(save_str) + 1; |
2427 | if (str + len < end) |
2428 | memcpy(str, save_str, len); |
2429 | str += len; |
2430 | break; |
2431 | } |
2432 | |
2433 | case FORMAT_TYPE_PTR: |
2434 | save_arg(void *); |
2435 | /* skip all alphanumeric pointer suffixes */ |
2436 | while (isalnum(*fmt)) |
2437 | fmt++; |
2438 | break; |
2439 | |
2440 | default: |
2441 | switch (spec.type) { |
2442 | |
2443 | case FORMAT_TYPE_LONG_LONG: |
2444 | save_arg(long long); |
2445 | break; |
2446 | case FORMAT_TYPE_ULONG: |
2447 | case FORMAT_TYPE_LONG: |
2448 | save_arg(unsigned long); |
2449 | break; |
2450 | case FORMAT_TYPE_SIZE_T: |
2451 | save_arg(size_t); |
2452 | break; |
2453 | case FORMAT_TYPE_PTRDIFF: |
2454 | save_arg(ptrdiff_t); |
2455 | break; |
2456 | case FORMAT_TYPE_UBYTE: |
2457 | case FORMAT_TYPE_BYTE: |
2458 | save_arg(char); |
2459 | break; |
2460 | case FORMAT_TYPE_USHORT: |
2461 | case FORMAT_TYPE_SHORT: |
2462 | save_arg(short); |
2463 | break; |
2464 | default: |
2465 | save_arg(int); |
2466 | } |
2467 | } |
2468 | } |
2469 | |
2470 | out: |
2471 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
2472 | #undef save_arg |
2473 | } |
2474 | EXPORT_SYMBOL_GPL(vbin_printf); |
2475 | |
2476 | /** |
2477 | * bstr_printf - Format a string from binary arguments and place it in a buffer |
2478 | * @buf: The buffer to place the result into |
2479 | * @size: The size of the buffer, including the trailing null space |
2480 | * @fmt: The format string to use |
2481 | * @bin_buf: Binary arguments for the format string |
2482 | * |
2483 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets |
2484 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is |
2485 | * a binary buffer that generated by vbin_printf. |
2486 | * |
2487 | * The format follows C99 vsnprintf, but has some extensions: |
2488 | * see vsnprintf comment for details. |
2489 | * |
2490 | * The return value is the number of characters which would |
2491 | * be generated for the given input, excluding the trailing |
2492 | * '\0', as per ISO C99. If you want to have the exact |
2493 | * number of characters written into @buf as return value |
2494 | * (not including the trailing '\0'), use vscnprintf(). If the |
2495 | * return is greater than or equal to @size, the resulting |
2496 | * string is truncated. |
2497 | */ |
2498 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) |
2499 | { |
2500 | struct printf_spec spec = {0}; |
2501 | char *str, *end; |
2502 | const char *args = (const char *)bin_buf; |
2503 | |
2504 | if (WARN_ON_ONCE(size > INT_MAX)) |
2505 | return 0; |
2506 | |
2507 | str = buf; |
2508 | end = buf + size; |
2509 | |
2510 | #define get_arg(type) \ |
2511 | ({ \ |
2512 | typeof(type) value; \ |
2513 | if (sizeof(type) == 8) { \ |
2514 | args = PTR_ALIGN(args, sizeof(u32)); \ |
2515 | *(u32 *)&value = *(u32 *)args; \ |
2516 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ |
2517 | } else { \ |
2518 | args = PTR_ALIGN(args, sizeof(type)); \ |
2519 | value = *(typeof(type) *)args; \ |
2520 | } \ |
2521 | args += sizeof(type); \ |
2522 | value; \ |
2523 | }) |
2524 | |
2525 | /* Make sure end is always >= buf */ |
2526 | if (end < buf) { |
2527 | end = ((void *)-1); |
2528 | size = end - buf; |
2529 | } |
2530 | |
2531 | while (*fmt) { |
2532 | const char *old_fmt = fmt; |
2533 | int read = format_decode(fmt, &spec); |
2534 | |
2535 | fmt += read; |
2536 | |
2537 | switch (spec.type) { |
2538 | case FORMAT_TYPE_NONE: { |
2539 | int copy = read; |
2540 | if (str < end) { |
2541 | if (copy > end - str) |
2542 | copy = end - str; |
2543 | memcpy(str, old_fmt, copy); |
2544 | } |
2545 | str += read; |
2546 | break; |
2547 | } |
2548 | |
2549 | case FORMAT_TYPE_WIDTH: |
2550 | set_field_width(&spec, get_arg(int)); |
2551 | break; |
2552 | |
2553 | case FORMAT_TYPE_PRECISION: |
2554 | set_precision(&spec, get_arg(int)); |
2555 | break; |
2556 | |
2557 | case FORMAT_TYPE_CHAR: { |
2558 | char c; |
2559 | |
2560 | if (!(spec.flags & LEFT)) { |
2561 | while (--spec.field_width > 0) { |
2562 | if (str < end) |
2563 | *str = ' '; |
2564 | ++str; |
2565 | } |
2566 | } |
2567 | c = (unsigned char) get_arg(char); |
2568 | if (str < end) |
2569 | *str = c; |
2570 | ++str; |
2571 | while (--spec.field_width > 0) { |
2572 | if (str < end) |
2573 | *str = ' '; |
2574 | ++str; |
2575 | } |
2576 | break; |
2577 | } |
2578 | |
2579 | case FORMAT_TYPE_STR: { |
2580 | const char *str_arg = args; |
2581 | args += strlen(str_arg) + 1; |
2582 | str = string(str, end, (char *)str_arg, spec); |
2583 | break; |
2584 | } |
2585 | |
2586 | case FORMAT_TYPE_PTR: |
2587 | str = pointer(fmt, str, end, get_arg(void *), spec); |
2588 | while (isalnum(*fmt)) |
2589 | fmt++; |
2590 | break; |
2591 | |
2592 | case FORMAT_TYPE_PERCENT_CHAR: |
2593 | if (str < end) |
2594 | *str = '%'; |
2595 | ++str; |
2596 | break; |
2597 | |
2598 | case FORMAT_TYPE_INVALID: |
2599 | goto out; |
2600 | |
2601 | default: { |
2602 | unsigned long long num; |
2603 | |
2604 | switch (spec.type) { |
2605 | |
2606 | case FORMAT_TYPE_LONG_LONG: |
2607 | num = get_arg(long long); |
2608 | break; |
2609 | case FORMAT_TYPE_ULONG: |
2610 | case FORMAT_TYPE_LONG: |
2611 | num = get_arg(unsigned long); |
2612 | break; |
2613 | case FORMAT_TYPE_SIZE_T: |
2614 | num = get_arg(size_t); |
2615 | break; |
2616 | case FORMAT_TYPE_PTRDIFF: |
2617 | num = get_arg(ptrdiff_t); |
2618 | break; |
2619 | case FORMAT_TYPE_UBYTE: |
2620 | num = get_arg(unsigned char); |
2621 | break; |
2622 | case FORMAT_TYPE_BYTE: |
2623 | num = get_arg(signed char); |
2624 | break; |
2625 | case FORMAT_TYPE_USHORT: |
2626 | num = get_arg(unsigned short); |
2627 | break; |
2628 | case FORMAT_TYPE_SHORT: |
2629 | num = get_arg(short); |
2630 | break; |
2631 | case FORMAT_TYPE_UINT: |
2632 | num = get_arg(unsigned int); |
2633 | break; |
2634 | default: |
2635 | num = get_arg(int); |
2636 | } |
2637 | |
2638 | str = number(str, end, num, spec); |
2639 | } /* default: */ |
2640 | } /* switch(spec.type) */ |
2641 | } /* while(*fmt) */ |
2642 | |
2643 | out: |
2644 | if (size > 0) { |
2645 | if (str < end) |
2646 | *str = '\0'; |
2647 | else |
2648 | end[-1] = '\0'; |
2649 | } |
2650 | |
2651 | #undef get_arg |
2652 | |
2653 | /* the trailing null byte doesn't count towards the total */ |
2654 | return str - buf; |
2655 | } |
2656 | EXPORT_SYMBOL_GPL(bstr_printf); |
2657 | |
2658 | /** |
2659 | * bprintf - Parse a format string and place args' binary value in a buffer |
2660 | * @bin_buf: The buffer to place args' binary value |
2661 | * @size: The size of the buffer(by words(32bits), not characters) |
2662 | * @fmt: The format string to use |
2663 | * @...: Arguments for the format string |
2664 | * |
2665 | * The function returns the number of words(u32) written |
2666 | * into @bin_buf. |
2667 | */ |
2668 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) |
2669 | { |
2670 | va_list args; |
2671 | int ret; |
2672 | |
2673 | va_start(args, fmt); |
2674 | ret = vbin_printf(bin_buf, size, fmt, args); |
2675 | va_end(args); |
2676 | |
2677 | return ret; |
2678 | } |
2679 | EXPORT_SYMBOL_GPL(bprintf); |
2680 | |
2681 | #endif /* CONFIG_BINARY_PRINTF */ |
2682 | |
2683 | /** |
2684 | * vsscanf - Unformat a buffer into a list of arguments |
2685 | * @buf: input buffer |
2686 | * @fmt: format of buffer |
2687 | * @args: arguments |
2688 | */ |
2689 | int vsscanf(const char *buf, const char *fmt, va_list args) |
2690 | { |
2691 | const char *str = buf; |
2692 | char *next; |
2693 | char digit; |
2694 | int num = 0; |
2695 | u8 qualifier; |
2696 | unsigned int base; |
2697 | union { |
2698 | long long s; |
2699 | unsigned long long u; |
2700 | } val; |
2701 | s16 field_width; |
2702 | bool is_sign; |
2703 | |
2704 | while (*fmt) { |
2705 | /* skip any white space in format */ |
2706 | /* white space in format matchs any amount of |
2707 | * white space, including none, in the input. |
2708 | */ |
2709 | if (isspace(*fmt)) { |
2710 | fmt = skip_spaces(++fmt); |
2711 | str = skip_spaces(str); |
2712 | } |
2713 | |
2714 | /* anything that is not a conversion must match exactly */ |
2715 | if (*fmt != '%' && *fmt) { |
2716 | if (*fmt++ != *str++) |
2717 | break; |
2718 | continue; |
2719 | } |
2720 | |
2721 | if (!*fmt) |
2722 | break; |
2723 | ++fmt; |
2724 | |
2725 | /* skip this conversion. |
2726 | * advance both strings to next white space |
2727 | */ |
2728 | if (*fmt == '*') { |
2729 | if (!*str) |
2730 | break; |
2731 | while (!isspace(*fmt) && *fmt != '%' && *fmt) { |
2732 | /* '%*[' not yet supported, invalid format */ |
2733 | if (*fmt == '[') |
2734 | return num; |
2735 | fmt++; |
2736 | } |
2737 | while (!isspace(*str) && *str) |
2738 | str++; |
2739 | continue; |
2740 | } |
2741 | |
2742 | /* get field width */ |
2743 | field_width = -1; |
2744 | if (isdigit(*fmt)) { |
2745 | field_width = skip_atoi(&fmt); |
2746 | if (field_width <= 0) |
2747 | break; |
2748 | } |
2749 | |
2750 | /* get conversion qualifier */ |
2751 | qualifier = -1; |
2752 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2753 | _tolower(*fmt) == 'z') { |
2754 | qualifier = *fmt++; |
2755 | if (unlikely(qualifier == *fmt)) { |
2756 | if (qualifier == 'h') { |
2757 | qualifier = 'H'; |
2758 | fmt++; |
2759 | } else if (qualifier == 'l') { |
2760 | qualifier = 'L'; |
2761 | fmt++; |
2762 | } |
2763 | } |
2764 | } |
2765 | |
2766 | if (!*fmt) |
2767 | break; |
2768 | |
2769 | if (*fmt == 'n') { |
2770 | /* return number of characters read so far */ |
2771 | *va_arg(args, int *) = str - buf; |
2772 | ++fmt; |
2773 | continue; |
2774 | } |
2775 | |
2776 | if (!*str) |
2777 | break; |
2778 | |
2779 | base = 10; |
2780 | is_sign = false; |
2781 | |
2782 | switch (*fmt++) { |
2783 | case 'c': |
2784 | { |
2785 | char *s = (char *)va_arg(args, char*); |
2786 | if (field_width == -1) |
2787 | field_width = 1; |
2788 | do { |
2789 | *s++ = *str++; |
2790 | } while (--field_width > 0 && *str); |
2791 | num++; |
2792 | } |
2793 | continue; |
2794 | case 's': |
2795 | { |
2796 | char *s = (char *)va_arg(args, char *); |
2797 | if (field_width == -1) |
2798 | field_width = SHRT_MAX; |
2799 | /* first, skip leading white space in buffer */ |
2800 | str = skip_spaces(str); |
2801 | |
2802 | /* now copy until next white space */ |
2803 | while (*str && !isspace(*str) && field_width--) |
2804 | *s++ = *str++; |
2805 | *s = '\0'; |
2806 | num++; |
2807 | } |
2808 | continue; |
2809 | /* |
2810 | * Warning: This implementation of the '[' conversion specifier |
2811 | * deviates from its glibc counterpart in the following ways: |
2812 | * (1) It does NOT support ranges i.e. '-' is NOT a special |
2813 | * character |
2814 | * (2) It cannot match the closing bracket ']' itself |
2815 | * (3) A field width is required |
2816 | * (4) '%*[' (discard matching input) is currently not supported |
2817 | * |
2818 | * Example usage: |
2819 | * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]", |
2820 | * buf1, buf2, buf3); |
2821 | * if (ret < 3) |
2822 | * // etc.. |
2823 | */ |
2824 | case '[': |
2825 | { |
2826 | char *s = (char *)va_arg(args, char *); |
2827 | DECLARE_BITMAP(set, 256) = {0}; |
2828 | unsigned int len = 0; |
2829 | bool negate = (*fmt == '^'); |
2830 | |
2831 | /* field width is required */ |
2832 | if (field_width == -1) |
2833 | return num; |
2834 | |
2835 | if (negate) |
2836 | ++fmt; |
2837 | |
2838 | for ( ; *fmt && *fmt != ']'; ++fmt, ++len) |
2839 | set_bit((u8)*fmt, set); |
2840 | |
2841 | /* no ']' or no character set found */ |
2842 | if (!*fmt || !len) |
2843 | return num; |
2844 | ++fmt; |
2845 | |
2846 | if (negate) { |
2847 | bitmap_complement(set, set, 256); |
2848 | /* exclude null '\0' byte */ |
2849 | clear_bit(0, set); |
2850 | } |
2851 | |
2852 | /* match must be non-empty */ |
2853 | if (!test_bit((u8)*str, set)) |
2854 | return num; |
2855 | |
2856 | while (test_bit((u8)*str, set) && field_width--) |
2857 | *s++ = *str++; |
2858 | *s = '\0'; |
2859 | ++num; |
2860 | } |
2861 | continue; |
2862 | case 'o': |
2863 | base = 8; |
2864 | break; |
2865 | case 'x': |
2866 | case 'X': |
2867 | base = 16; |
2868 | break; |
2869 | case 'i': |
2870 | base = 0; |
2871 | case 'd': |
2872 | is_sign = true; |
2873 | case 'u': |
2874 | break; |
2875 | case '%': |
2876 | /* looking for '%' in str */ |
2877 | if (*str++ != '%') |
2878 | return num; |
2879 | continue; |
2880 | default: |
2881 | /* invalid format; stop here */ |
2882 | return num; |
2883 | } |
2884 | |
2885 | /* have some sort of integer conversion. |
2886 | * first, skip white space in buffer. |
2887 | */ |
2888 | str = skip_spaces(str); |
2889 | |
2890 | digit = *str; |
2891 | if (is_sign && digit == '-') |
2892 | digit = *(str + 1); |
2893 | |
2894 | if (!digit |
2895 | || (base == 16 && !isxdigit(digit)) |
2896 | || (base == 10 && !isdigit(digit)) |
2897 | || (base == 8 && (!isdigit(digit) || digit > '7')) |
2898 | || (base == 0 && !isdigit(digit))) |
2899 | break; |
2900 | |
2901 | if (is_sign) |
2902 | val.s = qualifier != 'L' ? |
2903 | simple_strtol(str, &next, base) : |
2904 | simple_strtoll(str, &next, base); |
2905 | else |
2906 | val.u = qualifier != 'L' ? |
2907 | simple_strtoul(str, &next, base) : |
2908 | simple_strtoull(str, &next, base); |
2909 | |
2910 | if (field_width > 0 && next - str > field_width) { |
2911 | if (base == 0) |
2912 | _parse_integer_fixup_radix(str, &base); |
2913 | while (next - str > field_width) { |
2914 | if (is_sign) |
2915 | val.s = div_s64(val.s, base); |
2916 | else |
2917 | val.u = div_u64(val.u, base); |
2918 | --next; |
2919 | } |
2920 | } |
2921 | |
2922 | switch (qualifier) { |
2923 | case 'H': /* that's 'hh' in format */ |
2924 | if (is_sign) |
2925 | *va_arg(args, signed char *) = val.s; |
2926 | else |
2927 | *va_arg(args, unsigned char *) = val.u; |
2928 | break; |
2929 | case 'h': |
2930 | if (is_sign) |
2931 | *va_arg(args, short *) = val.s; |
2932 | else |
2933 | *va_arg(args, unsigned short *) = val.u; |
2934 | break; |
2935 | case 'l': |
2936 | if (is_sign) |
2937 | *va_arg(args, long *) = val.s; |
2938 | else |
2939 | *va_arg(args, unsigned long *) = val.u; |
2940 | break; |
2941 | case 'L': |
2942 | if (is_sign) |
2943 | *va_arg(args, long long *) = val.s; |
2944 | else |
2945 | *va_arg(args, unsigned long long *) = val.u; |
2946 | break; |
2947 | case 'Z': |
2948 | case 'z': |
2949 | *va_arg(args, size_t *) = val.u; |
2950 | break; |
2951 | default: |
2952 | if (is_sign) |
2953 | *va_arg(args, int *) = val.s; |
2954 | else |
2955 | *va_arg(args, unsigned int *) = val.u; |
2956 | break; |
2957 | } |
2958 | num++; |
2959 | |
2960 | if (!next) |
2961 | break; |
2962 | str = next; |
2963 | } |
2964 | |
2965 | return num; |
2966 | } |
2967 | EXPORT_SYMBOL(vsscanf); |
2968 | |
2969 | /** |
2970 | * sscanf - Unformat a buffer into a list of arguments |
2971 | * @buf: input buffer |
2972 | * @fmt: formatting of buffer |
2973 | * @...: resulting arguments |
2974 | */ |
2975 | int sscanf(const char *buf, const char *fmt, ...) |
2976 | { |
2977 | va_list args; |
2978 | int i; |
2979 | |
2980 | va_start(args, fmt); |
2981 | i = vsscanf(buf, fmt, args); |
2982 | va_end(args); |
2983 | |
2984 | return i; |
2985 | } |
2986 | EXPORT_SYMBOL(sscanf); |
2987 |