Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/lib/vsprintf.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ | |
8 | /* | |
9 | * Wirzenius wrote this portably, Torvalds fucked it up :-) | |
10 | */ | |
11 | ||
7b9186f5 | 12 | /* |
1da177e4 LT |
13 | * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
14 | * - changed to provide snprintf and vsnprintf functions | |
15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> | |
16 | * - scnprintf and vscnprintf | |
17 | */ | |
18 | ||
19 | #include <stdarg.h> | |
8bc3bcc9 | 20 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
0fe1ef24 | 25 | #include <linux/kallsyms.h> |
53809751 | 26 | #include <linux/math64.h> |
0fe1ef24 | 27 | #include <linux/uaccess.h> |
332d2e78 | 28 | #include <linux/ioport.h> |
4b6ccca7 | 29 | #include <linux/dcache.h> |
8a27f7c9 | 30 | #include <net/addrconf.h> |
1da177e4 | 31 | |
4e57b681 | 32 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 33 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 34 | |
1dff46d6 | 35 | #include "kstrtox.h" |
aa46a63e | 36 | |
1da177e4 | 37 | /** |
922ac25c | 38 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
39 | * @cp: The start of the string |
40 | * @endp: A pointer to the end of the parsed string will be placed here | |
41 | * @base: The number base to use | |
462e4711 EZ |
42 | * |
43 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 44 | */ |
922ac25c | 45 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 46 | { |
1dff46d6 AD |
47 | unsigned long long result; |
48 | unsigned int rv; | |
aa46a63e | 49 | |
1dff46d6 AD |
50 | cp = _parse_integer_fixup_radix(cp, &base); |
51 | rv = _parse_integer(cp, base, &result); | |
52 | /* FIXME */ | |
53 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 54 | |
1da177e4 LT |
55 | if (endp) |
56 | *endp = (char *)cp; | |
7b9186f5 | 57 | |
1da177e4 LT |
58 | return result; |
59 | } | |
922ac25c | 60 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
61 | |
62 | /** | |
922ac25c | 63 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
64 | * @cp: The start of the string |
65 | * @endp: A pointer to the end of the parsed string will be placed here | |
66 | * @base: The number base to use | |
462e4711 EZ |
67 | * |
68 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 69 | */ |
922ac25c | 70 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 71 | { |
922ac25c | 72 | return simple_strtoull(cp, endp, base); |
1da177e4 | 73 | } |
922ac25c | 74 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
75 | |
76 | /** | |
922ac25c | 77 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
78 | * @cp: The start of the string |
79 | * @endp: A pointer to the end of the parsed string will be placed here | |
80 | * @base: The number base to use | |
462e4711 EZ |
81 | * |
82 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 83 | */ |
922ac25c | 84 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 85 | { |
922ac25c AGR |
86 | if (*cp == '-') |
87 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 88 | |
922ac25c | 89 | return simple_strtoul(cp, endp, base); |
1da177e4 | 90 | } |
922ac25c | 91 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
92 | |
93 | /** | |
94 | * simple_strtoll - convert a string to a signed long long | |
95 | * @cp: The start of the string | |
96 | * @endp: A pointer to the end of the parsed string will be placed here | |
97 | * @base: The number base to use | |
462e4711 EZ |
98 | * |
99 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 100 | */ |
22d27051 | 101 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 102 | { |
7b9186f5 | 103 | if (*cp == '-') |
22d27051 | 104 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 105 | |
22d27051 | 106 | return simple_strtoull(cp, endp, base); |
1da177e4 | 107 | } |
98d5ce0d | 108 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 109 | |
cf3b429b JP |
110 | static noinline_for_stack |
111 | int skip_atoi(const char **s) | |
1da177e4 | 112 | { |
7b9186f5 | 113 | int i = 0; |
1da177e4 LT |
114 | |
115 | while (isdigit(**s)) | |
116 | i = i*10 + *((*s)++) - '0'; | |
7b9186f5 | 117 | |
1da177e4 LT |
118 | return i; |
119 | } | |
120 | ||
4277eedd DV |
121 | /* Decimal conversion is by far the most typical, and is used |
122 | * for /proc and /sys data. This directly impacts e.g. top performance | |
123 | * with many processes running. We optimize it for speed | |
133fd9f5 DV |
124 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
125 | * (with permission from the author, Douglas W. Jones). | |
126 | */ | |
4277eedd | 127 | |
133fd9f5 DV |
128 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
129 | /* Formats correctly any integer in [0, 999999999] */ | |
cf3b429b | 130 | static noinline_for_stack |
133fd9f5 | 131 | char *put_dec_full9(char *buf, unsigned q) |
4277eedd | 132 | { |
133fd9f5 | 133 | unsigned r; |
7b9186f5 | 134 | |
133fd9f5 DV |
135 | /* |
136 | * Possible ways to approx. divide by 10 | |
137 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) | |
138 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) | |
139 | * (x * 0x6667) >> 18 x < 43699 | |
140 | * (x * 0x3334) >> 17 x < 16389 | |
141 | * (x * 0x199a) >> 16 x < 16389 | |
142 | * (x * 0x0ccd) >> 15 x < 16389 | |
143 | * (x * 0x0667) >> 14 x < 2739 | |
144 | * (x * 0x0334) >> 13 x < 1029 | |
145 | * (x * 0x019a) >> 12 x < 1029 | |
146 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) | |
147 | * (x * 0x0067) >> 10 x < 179 | |
148 | * (x * 0x0034) >> 9 x < 69 same | |
149 | * (x * 0x001a) >> 8 x < 69 same | |
150 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) | |
151 | * (x * 0x0007) >> 6 x < 19 | |
152 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> | |
153 | */ | |
154 | r = (q * (uint64_t)0x1999999a) >> 32; | |
155 | *buf++ = (q - 10 * r) + '0'; /* 1 */ | |
156 | q = (r * (uint64_t)0x1999999a) >> 32; | |
157 | *buf++ = (r - 10 * q) + '0'; /* 2 */ | |
158 | r = (q * (uint64_t)0x1999999a) >> 32; | |
159 | *buf++ = (q - 10 * r) + '0'; /* 3 */ | |
160 | q = (r * (uint64_t)0x1999999a) >> 32; | |
161 | *buf++ = (r - 10 * q) + '0'; /* 4 */ | |
162 | r = (q * (uint64_t)0x1999999a) >> 32; | |
163 | *buf++ = (q - 10 * r) + '0'; /* 5 */ | |
164 | /* Now value is under 10000, can avoid 64-bit multiply */ | |
165 | q = (r * 0x199a) >> 16; | |
166 | *buf++ = (r - 10 * q) + '0'; /* 6 */ | |
167 | r = (q * 0xcd) >> 11; | |
168 | *buf++ = (q - 10 * r) + '0'; /* 7 */ | |
169 | q = (r * 0xcd) >> 11; | |
170 | *buf++ = (r - 10 * q) + '0'; /* 8 */ | |
171 | *buf++ = q + '0'; /* 9 */ | |
4277eedd DV |
172 | return buf; |
173 | } | |
133fd9f5 DV |
174 | #endif |
175 | ||
176 | /* Similar to above but do not pad with zeros. | |
177 | * Code can be easily arranged to print 9 digits too, but our callers | |
178 | * always call put_dec_full9() instead when the number has 9 decimal digits. | |
179 | */ | |
cf3b429b | 180 | static noinline_for_stack |
133fd9f5 | 181 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 182 | { |
133fd9f5 DV |
183 | unsigned q; |
184 | ||
185 | /* Copy of previous function's body with added early returns */ | |
cb239d0a GS |
186 | while (r >= 10000) { |
187 | q = r + '0'; | |
188 | r = (r * (uint64_t)0x1999999a) >> 32; | |
189 | *buf++ = q - 10*r; | |
190 | } | |
191 | ||
f4000516 GS |
192 | q = (r * 0x199a) >> 16; /* r <= 9999 */ |
193 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
194 | if (q == 0) |
195 | return buf; | |
f4000516 GS |
196 | r = (q * 0xcd) >> 11; /* q <= 999 */ |
197 | *buf++ = (q - 10 * r) + '0'; | |
133fd9f5 DV |
198 | if (r == 0) |
199 | return buf; | |
f4000516 GS |
200 | q = (r * 0xcd) >> 11; /* r <= 99 */ |
201 | *buf++ = (r - 10 * q) + '0'; | |
133fd9f5 DV |
202 | if (q == 0) |
203 | return buf; | |
f4000516 | 204 | *buf++ = q + '0'; /* q <= 9 */ |
133fd9f5 DV |
205 | return buf; |
206 | } | |
4277eedd | 207 | |
133fd9f5 DV |
208 | /* There are two algorithms to print larger numbers. |
209 | * One is generic: divide by 1000000000 and repeatedly print | |
210 | * groups of (up to) 9 digits. It's conceptually simple, | |
211 | * but requires a (unsigned long long) / 1000000000 division. | |
212 | * | |
213 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, | |
214 | * manipulates them cleverly and generates groups of 4 decimal digits. | |
215 | * It so happens that it does NOT require long long division. | |
216 | * | |
217 | * If long is > 32 bits, division of 64-bit values is relatively easy, | |
218 | * and we will use the first algorithm. | |
219 | * If long long is > 64 bits (strange architecture with VERY large long long), | |
220 | * second algorithm can't be used, and we again use the first one. | |
221 | * | |
222 | * Else (if long is 32 bits and long long is 64 bits) we use second one. | |
223 | */ | |
7b9186f5 | 224 | |
133fd9f5 DV |
225 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
226 | ||
227 | /* First algorithm: generic */ | |
228 | ||
229 | static | |
230 | char *put_dec(char *buf, unsigned long long n) | |
231 | { | |
232 | if (n >= 100*1000*1000) { | |
233 | while (n >= 1000*1000*1000) | |
234 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); | |
235 | if (n >= 100*1000*1000) | |
236 | return put_dec_full9(buf, n); | |
237 | } | |
238 | return put_dec_trunc8(buf, n); | |
4277eedd | 239 | } |
133fd9f5 DV |
240 | |
241 | #else | |
242 | ||
243 | /* Second algorithm: valid only for 64-bit long longs */ | |
244 | ||
e49317d4 | 245 | /* See comment in put_dec_full9 for choice of constants */ |
cf3b429b | 246 | static noinline_for_stack |
2359172a | 247 | void put_dec_full4(char *buf, unsigned q) |
4277eedd | 248 | { |
133fd9f5 | 249 | unsigned r; |
e49317d4 | 250 | r = (q * 0xccd) >> 15; |
2359172a | 251 | buf[0] = (q - 10 * r) + '0'; |
e49317d4 | 252 | q = (r * 0xcd) >> 11; |
2359172a | 253 | buf[1] = (r - 10 * q) + '0'; |
133fd9f5 | 254 | r = (q * 0xcd) >> 11; |
2359172a GS |
255 | buf[2] = (q - 10 * r) + '0'; |
256 | buf[3] = r + '0'; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
261 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
262 | * holds for all x < 1,128,869,999. The largest value this | |
263 | * helper will ever be asked to convert is 1,125,520,955. | |
264 | * (d1 in the put_dec code, assuming n is all-ones). | |
265 | */ | |
266 | static | |
267 | unsigned put_dec_helper4(char *buf, unsigned x) | |
268 | { | |
269 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
270 | ||
271 | put_dec_full4(buf, x - q * 10000); | |
272 | return q; | |
4277eedd DV |
273 | } |
274 | ||
133fd9f5 DV |
275 | /* Based on code by Douglas W. Jones found at |
276 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
277 | * (with permission from the author). | |
278 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
279 | */ | |
280 | static | |
281 | char *put_dec(char *buf, unsigned long long n) | |
282 | { | |
283 | uint32_t d3, d2, d1, q, h; | |
284 | ||
285 | if (n < 100*1000*1000) | |
286 | return put_dec_trunc8(buf, n); | |
287 | ||
288 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
289 | h = (n >> 32); | |
290 | d2 = (h ) & 0xffff; | |
291 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
292 | ||
293 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
2359172a GS |
294 | q = put_dec_helper4(buf, q); |
295 | ||
296 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
297 | q = put_dec_helper4(buf+4, q); | |
298 | ||
299 | q += 4749 * d3 + 42 * d2; | |
300 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 301 | |
2359172a GS |
302 | q += 281 * d3; |
303 | buf += 12; | |
304 | if (q) | |
305 | buf = put_dec_trunc8(buf, q); | |
306 | else while (buf[-1] == '0') | |
133fd9f5 DV |
307 | --buf; |
308 | ||
309 | return buf; | |
310 | } | |
311 | ||
312 | #endif | |
313 | ||
1ac101a5 KH |
314 | /* |
315 | * Convert passed number to decimal string. | |
316 | * Returns the length of string. On buffer overflow, returns 0. | |
317 | * | |
318 | * If speed is not important, use snprintf(). It's easy to read the code. | |
319 | */ | |
320 | int num_to_str(char *buf, int size, unsigned long long num) | |
321 | { | |
133fd9f5 | 322 | char tmp[sizeof(num) * 3]; |
1ac101a5 KH |
323 | int idx, len; |
324 | ||
133fd9f5 DV |
325 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
326 | if (num <= 9) { | |
327 | tmp[0] = '0' + num; | |
328 | len = 1; | |
329 | } else { | |
330 | len = put_dec(tmp, num) - tmp; | |
331 | } | |
1ac101a5 KH |
332 | |
333 | if (len > size) | |
334 | return 0; | |
335 | for (idx = 0; idx < len; ++idx) | |
336 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 337 | return len; |
1ac101a5 KH |
338 | } |
339 | ||
1da177e4 LT |
340 | #define ZEROPAD 1 /* pad with zero */ |
341 | #define SIGN 2 /* unsigned/signed long */ | |
342 | #define PLUS 4 /* show plus */ | |
343 | #define SPACE 8 /* space if plus */ | |
344 | #define LEFT 16 /* left justified */ | |
b89dc5d6 BH |
345 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
346 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 347 | |
fef20d9c FW |
348 | enum format_type { |
349 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 350 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
351 | FORMAT_TYPE_PRECISION, |
352 | FORMAT_TYPE_CHAR, | |
353 | FORMAT_TYPE_STR, | |
354 | FORMAT_TYPE_PTR, | |
355 | FORMAT_TYPE_PERCENT_CHAR, | |
356 | FORMAT_TYPE_INVALID, | |
357 | FORMAT_TYPE_LONG_LONG, | |
358 | FORMAT_TYPE_ULONG, | |
359 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
360 | FORMAT_TYPE_UBYTE, |
361 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
362 | FORMAT_TYPE_USHORT, |
363 | FORMAT_TYPE_SHORT, | |
364 | FORMAT_TYPE_UINT, | |
365 | FORMAT_TYPE_INT, | |
366 | FORMAT_TYPE_NRCHARS, | |
367 | FORMAT_TYPE_SIZE_T, | |
368 | FORMAT_TYPE_PTRDIFF | |
369 | }; | |
370 | ||
371 | struct printf_spec { | |
4e310fda | 372 | u8 type; /* format_type enum */ |
ef0658f3 | 373 | u8 flags; /* flags to number() */ |
4e310fda JP |
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 */ | |
fef20d9c FW |
378 | }; |
379 | ||
cf3b429b JP |
380 | static noinline_for_stack |
381 | char *number(char *buf, char *end, unsigned long long num, | |
382 | struct printf_spec spec) | |
1da177e4 | 383 | { |
9b706aee DV |
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; | |
fef20d9c | 390 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 391 | int i; |
7c203422 | 392 | bool is_zero = num == 0LL; |
1da177e4 | 393 | |
9b706aee DV |
394 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
395 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
396 | locase = (spec.flags & SMALL); |
397 | if (spec.flags & LEFT) | |
398 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 399 | sign = 0; |
fef20d9c | 400 | if (spec.flags & SIGN) { |
7b9186f5 | 401 | if ((signed long long)num < 0) { |
1da177e4 | 402 | sign = '-'; |
7b9186f5 | 403 | num = -(signed long long)num; |
fef20d9c FW |
404 | spec.field_width--; |
405 | } else if (spec.flags & PLUS) { | |
1da177e4 | 406 | sign = '+'; |
fef20d9c FW |
407 | spec.field_width--; |
408 | } else if (spec.flags & SPACE) { | |
1da177e4 | 409 | sign = ' '; |
fef20d9c | 410 | spec.field_width--; |
1da177e4 LT |
411 | } |
412 | } | |
b39a7340 | 413 | if (need_pfx) { |
fef20d9c | 414 | if (spec.base == 16) |
7c203422 PC |
415 | spec.field_width -= 2; |
416 | else if (!is_zero) | |
fef20d9c | 417 | spec.field_width--; |
1da177e4 | 418 | } |
b39a7340 DV |
419 | |
420 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 421 | i = 0; |
133fd9f5 DV |
422 | if (num < spec.base) |
423 | tmp[i++] = digits[num] | locase; | |
4277eedd DV |
424 | /* Generic code, for any base: |
425 | else do { | |
9b706aee | 426 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
427 | } while (num != 0); |
428 | */ | |
fef20d9c FW |
429 | else if (spec.base != 10) { /* 8 or 16 */ |
430 | int mask = spec.base - 1; | |
b39a7340 | 431 | int shift = 3; |
7b9186f5 AGR |
432 | |
433 | if (spec.base == 16) | |
434 | shift = 4; | |
b39a7340 | 435 | do { |
9b706aee | 436 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
437 | num >>= shift; |
438 | } while (num); | |
4277eedd DV |
439 | } else { /* base 10 */ |
440 | i = put_dec(tmp, num) - tmp; | |
441 | } | |
b39a7340 DV |
442 | |
443 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
444 | if (i > spec.precision) |
445 | spec.precision = i; | |
b39a7340 | 446 | /* leading space padding */ |
fef20d9c FW |
447 | spec.field_width -= spec.precision; |
448 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
7b9186f5 | 449 | while (--spec.field_width >= 0) { |
f796937a | 450 | if (buf < end) |
1da177e4 LT |
451 | *buf = ' '; |
452 | ++buf; | |
453 | } | |
454 | } | |
b39a7340 | 455 | /* sign */ |
1da177e4 | 456 | if (sign) { |
f796937a | 457 | if (buf < end) |
1da177e4 LT |
458 | *buf = sign; |
459 | ++buf; | |
460 | } | |
b39a7340 DV |
461 | /* "0x" / "0" prefix */ |
462 | if (need_pfx) { | |
7c203422 PC |
463 | if (spec.base == 16 || !is_zero) { |
464 | if (buf < end) | |
465 | *buf = '0'; | |
466 | ++buf; | |
467 | } | |
fef20d9c | 468 | if (spec.base == 16) { |
f796937a | 469 | if (buf < end) |
9b706aee | 470 | *buf = ('X' | locase); |
1da177e4 LT |
471 | ++buf; |
472 | } | |
473 | } | |
b39a7340 | 474 | /* zero or space padding */ |
fef20d9c FW |
475 | if (!(spec.flags & LEFT)) { |
476 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
477 | while (--spec.field_width >= 0) { | |
f796937a | 478 | if (buf < end) |
1da177e4 LT |
479 | *buf = c; |
480 | ++buf; | |
481 | } | |
482 | } | |
b39a7340 | 483 | /* hmm even more zero padding? */ |
fef20d9c | 484 | while (i <= --spec.precision) { |
f796937a | 485 | if (buf < end) |
1da177e4 LT |
486 | *buf = '0'; |
487 | ++buf; | |
488 | } | |
b39a7340 DV |
489 | /* actual digits of result */ |
490 | while (--i >= 0) { | |
f796937a | 491 | if (buf < end) |
1da177e4 LT |
492 | *buf = tmp[i]; |
493 | ++buf; | |
494 | } | |
b39a7340 | 495 | /* trailing space padding */ |
fef20d9c | 496 | while (--spec.field_width >= 0) { |
f796937a | 497 | if (buf < end) |
1da177e4 LT |
498 | *buf = ' '; |
499 | ++buf; | |
500 | } | |
7b9186f5 | 501 | |
1da177e4 LT |
502 | return buf; |
503 | } | |
504 | ||
cf3b429b JP |
505 | static noinline_for_stack |
506 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
507 | { |
508 | int len, i; | |
509 | ||
510 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 511 | s = "(null)"; |
0f9bfa56 | 512 | |
fef20d9c | 513 | len = strnlen(s, spec.precision); |
0f9bfa56 | 514 | |
fef20d9c FW |
515 | if (!(spec.flags & LEFT)) { |
516 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
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 | } | |
fef20d9c | 527 | while (len < spec.field_width--) { |
0f9bfa56 LT |
528 | if (buf < end) |
529 | *buf = ' '; | |
530 | ++buf; | |
531 | } | |
7b9186f5 | 532 | |
0f9bfa56 LT |
533 | return buf; |
534 | } | |
535 | ||
4b6ccca7 AV |
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 | ||
cf3b429b JP |
611 | static noinline_for_stack |
612 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 613 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 614 | { |
b0d33c2b | 615 | unsigned long value; |
0fe1ef24 LT |
616 | #ifdef CONFIG_KALLSYMS |
617 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
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') | |
0f77a8d3 | 626 | sprint_backtrace(sym, value); |
b0d33c2b | 627 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
628 | sprint_symbol(sym, value); |
629 | else | |
4796dd20 | 630 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 631 | |
fef20d9c | 632 | return string(buf, end, sym, spec); |
0fe1ef24 | 633 | #else |
7b9186f5 | 634 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
635 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
636 | spec.base = 16; | |
7b9186f5 | 637 | |
fef20d9c | 638 | return number(buf, end, value, spec); |
0fe1ef24 LT |
639 | #endif |
640 | } | |
641 | ||
cf3b429b JP |
642 | static noinline_for_stack |
643 | char *resource_string(char *buf, char *end, struct resource *res, | |
644 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
645 | { |
646 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 647 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
648 | #endif |
649 | ||
650 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 651 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 652 | #endif |
4da0b66c | 653 | static const struct printf_spec io_spec = { |
fef20d9c | 654 | .base = 16, |
4da0b66c | 655 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
656 | .precision = -1, |
657 | .flags = SPECIAL | SMALL | ZEROPAD, | |
658 | }; | |
4da0b66c BH |
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 | }; | |
0f4050c7 BH |
665 | static const struct printf_spec bus_spec = { |
666 | .base = 16, | |
667 | .field_width = 2, | |
668 | .precision = -1, | |
669 | .flags = SMALL | ZEROPAD, | |
670 | }; | |
4da0b66c | 671 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
672 | .base = 10, |
673 | .precision = -1, | |
674 | .flags = 0, | |
675 | }; | |
4da0b66c | 676 | static const struct printf_spec str_spec = { |
fd95541e BH |
677 | .field_width = -1, |
678 | .precision = 10, | |
679 | .flags = LEFT, | |
680 | }; | |
4da0b66c | 681 | static const struct printf_spec flag_spec = { |
fd95541e BH |
682 | .base = 16, |
683 | .precision = -1, | |
684 | .flags = SPECIAL | SMALL, | |
685 | }; | |
c7dabef8 BH |
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)) | |
9d7cca04 | 691 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
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 | ||
332d2e78 | 696 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 697 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 698 | const struct printf_spec *specp; |
332d2e78 LT |
699 | |
700 | *p++ = '['; | |
4da0b66c | 701 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 702 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
703 | specp = &io_spec; |
704 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 705 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
706 | specp = &mem_spec; |
707 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 708 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
709 | specp = &dec_spec; |
710 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 711 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 712 | specp = &dec_spec; |
0f4050c7 BH |
713 | } else if (res->flags & IORESOURCE_BUS) { |
714 | p = string(p, pend, "bus ", str_spec); | |
715 | specp = &bus_spec; | |
4da0b66c | 716 | } else { |
c7dabef8 | 717 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 718 | specp = &mem_spec; |
c7dabef8 | 719 | decode = 0; |
fd95541e | 720 | } |
4da0b66c | 721 | p = number(p, pend, res->start, *specp); |
c91d3376 BH |
722 | if (res->start != res->end) { |
723 | *p++ = '-'; | |
4da0b66c | 724 | p = number(p, pend, res->end, *specp); |
c91d3376 | 725 | } |
c7dabef8 | 726 | if (decode) { |
fd95541e BH |
727 | if (res->flags & IORESOURCE_MEM_64) |
728 | p = string(p, pend, " 64bit", str_spec); | |
729 | if (res->flags & IORESOURCE_PREFETCH) | |
730 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
731 | if (res->flags & IORESOURCE_WINDOW) |
732 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
733 | if (res->flags & IORESOURCE_DISABLED) |
734 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
735 | } else { |
736 | p = string(p, pend, " flags ", str_spec); | |
737 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 738 | } |
332d2e78 | 739 | *p++ = ']'; |
c7dabef8 | 740 | *p = '\0'; |
332d2e78 | 741 | |
fef20d9c | 742 | return string(buf, end, sym, spec); |
332d2e78 LT |
743 | } |
744 | ||
31550a16 AS |
745 | static noinline_for_stack |
746 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
747 | const char *fmt) | |
748 | { | |
360603a1 | 749 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
750 | negative value, fallback to the default */ |
751 | char separator; | |
752 | ||
753 | if (spec.field_width == 0) | |
754 | /* nothing to print */ | |
755 | return buf; | |
756 | ||
757 | if (ZERO_OR_NULL_PTR(addr)) | |
758 | /* NULL pointer */ | |
759 | return string(buf, end, NULL, spec); | |
760 | ||
761 | switch (fmt[1]) { | |
762 | case 'C': | |
763 | separator = ':'; | |
764 | break; | |
765 | case 'D': | |
766 | separator = '-'; | |
767 | break; | |
768 | case 'N': | |
769 | separator = 0; | |
770 | break; | |
771 | default: | |
772 | separator = ' '; | |
773 | break; | |
774 | } | |
775 | ||
776 | if (spec.field_width > 0) | |
777 | len = min_t(int, spec.field_width, 64); | |
778 | ||
779 | for (i = 0; i < len && buf < end - 1; i++) { | |
780 | buf = hex_byte_pack(buf, addr[i]); | |
781 | ||
782 | if (buf < end && separator && i != len - 1) | |
783 | *buf++ = separator; | |
784 | } | |
785 | ||
786 | return buf; | |
787 | } | |
788 | ||
cf3b429b JP |
789 | static noinline_for_stack |
790 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
791 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 792 | { |
8a27f7c9 | 793 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
794 | char *p = mac_addr; |
795 | int i; | |
bc7259a2 | 796 | char separator; |
76597ff9 | 797 | bool reversed = false; |
bc7259a2 | 798 | |
76597ff9 AE |
799 | switch (fmt[1]) { |
800 | case 'F': | |
bc7259a2 | 801 | separator = '-'; |
76597ff9 AE |
802 | break; |
803 | ||
804 | case 'R': | |
805 | reversed = true; | |
806 | /* fall through */ | |
807 | ||
808 | default: | |
bc7259a2 | 809 | separator = ':'; |
76597ff9 | 810 | break; |
bc7259a2 | 811 | } |
dd45c9cf HH |
812 | |
813 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
814 | if (reversed) |
815 | p = hex_byte_pack(p, addr[5 - i]); | |
816 | else | |
817 | p = hex_byte_pack(p, addr[i]); | |
818 | ||
8a27f7c9 | 819 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 820 | *p++ = separator; |
dd45c9cf HH |
821 | } |
822 | *p = '\0'; | |
823 | ||
fef20d9c | 824 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
825 | } |
826 | ||
cf3b429b JP |
827 | static noinline_for_stack |
828 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
829 | { |
830 | int i; | |
0159f24e JP |
831 | bool leading_zeros = (fmt[0] == 'i'); |
832 | int index; | |
833 | int step; | |
834 | ||
835 | switch (fmt[2]) { | |
836 | case 'h': | |
837 | #ifdef __BIG_ENDIAN | |
838 | index = 0; | |
839 | step = 1; | |
840 | #else | |
841 | index = 3; | |
842 | step = -1; | |
843 | #endif | |
844 | break; | |
845 | case 'l': | |
846 | index = 3; | |
847 | step = -1; | |
848 | break; | |
849 | case 'n': | |
850 | case 'b': | |
851 | default: | |
852 | index = 0; | |
853 | step = 1; | |
854 | break; | |
855 | } | |
8a27f7c9 JP |
856 | for (i = 0; i < 4; i++) { |
857 | char temp[3]; /* hold each IP quad in reverse order */ | |
133fd9f5 | 858 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
859 | if (leading_zeros) { |
860 | if (digits < 3) | |
861 | *p++ = '0'; | |
862 | if (digits < 2) | |
863 | *p++ = '0'; | |
864 | } | |
865 | /* reverse the digits in the quad */ | |
866 | while (digits--) | |
867 | *p++ = temp[digits]; | |
868 | if (i < 3) | |
869 | *p++ = '.'; | |
0159f24e | 870 | index += step; |
8a27f7c9 | 871 | } |
8a27f7c9 | 872 | *p = '\0'; |
7b9186f5 | 873 | |
8a27f7c9 JP |
874 | return p; |
875 | } | |
876 | ||
cf3b429b JP |
877 | static noinline_for_stack |
878 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 879 | { |
7b9186f5 | 880 | int i, j, range; |
8a27f7c9 JP |
881 | unsigned char zerolength[8]; |
882 | int longest = 1; | |
883 | int colonpos = -1; | |
884 | u16 word; | |
7b9186f5 | 885 | u8 hi, lo; |
8a27f7c9 | 886 | bool needcolon = false; |
eb78cd26 JP |
887 | bool useIPv4; |
888 | struct in6_addr in6; | |
889 | ||
890 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
891 | ||
892 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
893 | |
894 | memset(zerolength, 0, sizeof(zerolength)); | |
895 | ||
896 | if (useIPv4) | |
897 | range = 6; | |
898 | else | |
899 | range = 8; | |
900 | ||
901 | /* find position of longest 0 run */ | |
902 | for (i = 0; i < range; i++) { | |
903 | for (j = i; j < range; j++) { | |
eb78cd26 | 904 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
905 | break; |
906 | zerolength[i]++; | |
907 | } | |
908 | } | |
909 | for (i = 0; i < range; i++) { | |
910 | if (zerolength[i] > longest) { | |
911 | longest = zerolength[i]; | |
912 | colonpos = i; | |
913 | } | |
914 | } | |
29cf519e JP |
915 | if (longest == 1) /* don't compress a single 0 */ |
916 | colonpos = -1; | |
689afa7d | 917 | |
8a27f7c9 JP |
918 | /* emit address */ |
919 | for (i = 0; i < range; i++) { | |
920 | if (i == colonpos) { | |
921 | if (needcolon || i == 0) | |
922 | *p++ = ':'; | |
923 | *p++ = ':'; | |
924 | needcolon = false; | |
925 | i += longest - 1; | |
926 | continue; | |
927 | } | |
928 | if (needcolon) { | |
929 | *p++ = ':'; | |
930 | needcolon = false; | |
931 | } | |
932 | /* hex u16 without leading 0s */ | |
eb78cd26 | 933 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
934 | hi = word >> 8; |
935 | lo = word & 0xff; | |
936 | if (hi) { | |
937 | if (hi > 0x0f) | |
55036ba7 | 938 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
939 | else |
940 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 941 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 942 | } |
b5ff992b | 943 | else if (lo > 0x0f) |
55036ba7 | 944 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
945 | else |
946 | *p++ = hex_asc_lo(lo); | |
947 | needcolon = true; | |
948 | } | |
949 | ||
950 | if (useIPv4) { | |
951 | if (needcolon) | |
952 | *p++ = ':'; | |
0159f24e | 953 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 954 | } |
8a27f7c9 | 955 | *p = '\0'; |
7b9186f5 | 956 | |
8a27f7c9 JP |
957 | return p; |
958 | } | |
959 | ||
cf3b429b JP |
960 | static noinline_for_stack |
961 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
962 | { |
963 | int i; | |
7b9186f5 | 964 | |
689afa7d | 965 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
966 | p = hex_byte_pack(p, *addr++); |
967 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 968 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
969 | *p++ = ':'; |
970 | } | |
971 | *p = '\0'; | |
7b9186f5 | 972 | |
8a27f7c9 JP |
973 | return p; |
974 | } | |
975 | ||
cf3b429b JP |
976 | static noinline_for_stack |
977 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
978 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
979 | { |
980 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
981 | ||
982 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 983 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 984 | else |
eb78cd26 | 985 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 986 | |
fef20d9c | 987 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
988 | } |
989 | ||
cf3b429b JP |
990 | static noinline_for_stack |
991 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
992 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 993 | { |
8a27f7c9 | 994 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 995 | |
0159f24e | 996 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 997 | |
fef20d9c | 998 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
999 | } |
1000 | ||
10679643 DB |
1001 | static noinline_for_stack |
1002 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1003 | struct printf_spec spec, const char *fmt) | |
1004 | { | |
1005 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1006 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1007 | sizeof(":12345") + sizeof("/123456789") + | |
1008 | sizeof("%1234567890")]; | |
1009 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1010 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1011 | char fmt6[2] = { fmt[0], '6' }; | |
1012 | u8 off = 0; | |
1013 | ||
1014 | fmt++; | |
1015 | while (isalpha(*++fmt)) { | |
1016 | switch (*fmt) { | |
1017 | case 'p': | |
1018 | have_p = true; | |
1019 | break; | |
1020 | case 'f': | |
1021 | have_f = true; | |
1022 | break; | |
1023 | case 's': | |
1024 | have_s = true; | |
1025 | break; | |
1026 | case 'c': | |
1027 | have_c = true; | |
1028 | break; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | if (have_p || have_s || have_f) { | |
1033 | *p = '['; | |
1034 | off = 1; | |
1035 | } | |
1036 | ||
1037 | if (fmt6[0] == 'I' && have_c) | |
1038 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1039 | else | |
1040 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1041 | ||
1042 | if (have_p || have_s || have_f) | |
1043 | *p++ = ']'; | |
1044 | ||
1045 | if (have_p) { | |
1046 | *p++ = ':'; | |
1047 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1048 | } | |
1049 | if (have_f) { | |
1050 | *p++ = '/'; | |
1051 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1052 | IPV6_FLOWINFO_MASK), spec); | |
1053 | } | |
1054 | if (have_s) { | |
1055 | *p++ = '%'; | |
1056 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1057 | } | |
1058 | *p = '\0'; | |
1059 | ||
1060 | return string(buf, end, ip6_addr, spec); | |
1061 | } | |
1062 | ||
1063 | static noinline_for_stack | |
1064 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1065 | struct printf_spec spec, const char *fmt) | |
1066 | { | |
1067 | bool have_p = false; | |
1068 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1069 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1070 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1071 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1072 | ||
1073 | fmt++; | |
1074 | while (isalpha(*++fmt)) { | |
1075 | switch (*fmt) { | |
1076 | case 'p': | |
1077 | have_p = true; | |
1078 | break; | |
1079 | case 'h': | |
1080 | case 'l': | |
1081 | case 'n': | |
1082 | case 'b': | |
1083 | fmt4[2] = *fmt; | |
1084 | break; | |
1085 | } | |
1086 | } | |
1087 | ||
1088 | p = ip4_string(ip4_addr, addr, fmt4); | |
1089 | if (have_p) { | |
1090 | *p++ = ':'; | |
1091 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1092 | } | |
1093 | *p = '\0'; | |
1094 | ||
1095 | return string(buf, end, ip4_addr, spec); | |
1096 | } | |
1097 | ||
cf3b429b JP |
1098 | static noinline_for_stack |
1099 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1100 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
1101 | { |
1102 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1103 | char *p = uuid; | |
1104 | int i; | |
1105 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1106 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1107 | const u8 *index = be; | |
1108 | bool uc = false; | |
1109 | ||
1110 | switch (*(++fmt)) { | |
1111 | case 'L': | |
1112 | uc = true; /* fall-through */ | |
1113 | case 'l': | |
1114 | index = le; | |
1115 | break; | |
1116 | case 'B': | |
1117 | uc = true; | |
1118 | break; | |
1119 | } | |
1120 | ||
1121 | for (i = 0; i < 16; i++) { | |
55036ba7 | 1122 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
1123 | switch (i) { |
1124 | case 3: | |
1125 | case 5: | |
1126 | case 7: | |
1127 | case 9: | |
1128 | *p++ = '-'; | |
1129 | break; | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | *p = 0; | |
1134 | ||
1135 | if (uc) { | |
1136 | p = uuid; | |
1137 | do { | |
1138 | *p = toupper(*p); | |
1139 | } while (*(++p)); | |
1140 | } | |
1141 | ||
1142 | return string(buf, end, uuid, spec); | |
1143 | } | |
1144 | ||
c8f44aff MM |
1145 | static |
1146 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1147 | struct printf_spec spec) | |
1148 | { | |
1149 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1150 | if (spec.field_width == -1) | |
1151 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1152 | spec.base = 16; | |
1153 | ||
1154 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1155 | } | |
1156 | ||
411f05f1 | 1157 | int kptr_restrict __read_mostly; |
455cd5ab | 1158 | |
4d8a743c LT |
1159 | /* |
1160 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1161 | * by an extra set of alphanumeric characters that are extended format | |
1162 | * specifiers. | |
1163 | * | |
332d2e78 LT |
1164 | * Right now we handle: |
1165 | * | |
0c8b946e FW |
1166 | * - 'F' For symbolic function descriptor pointers with offset |
1167 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
1168 | * - 'S' For symbolic direct pointers with offset |
1169 | * - 's' For symbolic direct pointers without offset | |
b0d33c2b | 1170 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1171 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1172 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1173 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dd45c9cf HH |
1174 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1175 | * usual colon-separated hex notation | |
8a27f7c9 | 1176 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1177 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1178 | * with a dash-separated hex notation |
7c59154e | 1179 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1180 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1181 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1182 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1183 | * [S][pfs] |
1184 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1185 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1186 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1187 | * IPv6 omits the colons (01020304...0f) | |
1188 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1189 | * [S][pfs] |
1190 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1191 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1192 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1193 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1194 | * http://tools.ietf.org/html/rfc5952 |
9ac6e44e JP |
1195 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1196 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1197 | * Options for %pU are: | |
1198 | * b big endian lower case hex (default) | |
1199 | * B big endian UPPER case hex | |
1200 | * l little endian lower case hex | |
1201 | * L little endian UPPER case hex | |
1202 | * big endian output byte order is: | |
1203 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1204 | * little endian output byte order is: | |
1205 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1206 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1207 | * call vsnprintf(->format, *->va_list). | |
1208 | * Implements a "recursive vsnprintf". | |
1209 | * Do not use this feature without some mechanism to verify the | |
1210 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1211 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1212 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1213 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1214 | * a certain separator (' ' by default): | |
1215 | * C colon | |
1216 | * D dash | |
1217 | * N no separator | |
1218 | * The maximum supported length is 64 bytes of the input. Consider | |
1219 | * to use print_hex_dump() for the larger input. | |
7d799210 | 1220 | * - 'a' For a phys_addr_t type and its derivative types (passed by reference) |
9ac6e44e | 1221 | * |
332d2e78 LT |
1222 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1223 | * function pointers are really function descriptors, which contain a | |
1224 | * pointer to the real address. | |
4d8a743c | 1225 | */ |
cf3b429b JP |
1226 | static noinline_for_stack |
1227 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1228 | struct printf_spec spec) | |
78a8bf69 | 1229 | { |
725fe002 GL |
1230 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); |
1231 | ||
9f36e2c4 | 1232 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1233 | /* |
1234 | * Print (null) with the same width as a pointer so it makes | |
1235 | * tabular output look nice. | |
1236 | */ | |
1237 | if (spec.field_width == -1) | |
725fe002 | 1238 | spec.field_width = default_width; |
fef20d9c | 1239 | return string(buf, end, "(null)", spec); |
5e057981 | 1240 | } |
d97106ab | 1241 | |
0fe1ef24 LT |
1242 | switch (*fmt) { |
1243 | case 'F': | |
0c8b946e | 1244 | case 'f': |
0fe1ef24 LT |
1245 | ptr = dereference_function_descriptor(ptr); |
1246 | /* Fallthrough */ | |
1247 | case 'S': | |
9ac6e44e | 1248 | case 's': |
0f77a8d3 | 1249 | case 'B': |
b0d33c2b | 1250 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1251 | case 'R': |
c7dabef8 | 1252 | case 'r': |
fd95541e | 1253 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1254 | case 'h': |
1255 | return hex_string(buf, end, ptr, spec, fmt); | |
8a27f7c9 JP |
1256 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1257 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1258 | /* [mM]F (FDDI) */ |
1259 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1260 | return mac_address_string(buf, end, ptr, spec, fmt); |
1261 | case 'I': /* Formatted IP supported | |
1262 | * 4: 1.2.3.4 | |
1263 | * 6: 0001:0203:...:0708 | |
1264 | * 6c: 1::708 or 1::1.2.3.4 | |
1265 | */ | |
1266 | case 'i': /* Contiguous: | |
1267 | * 4: 001.002.003.004 | |
1268 | * 6: 000102...0f | |
1269 | */ | |
1270 | switch (fmt[1]) { | |
1271 | case '6': | |
1272 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1273 | case '4': | |
1274 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
1275 | case 'S': { |
1276 | const union { | |
1277 | struct sockaddr raw; | |
1278 | struct sockaddr_in v4; | |
1279 | struct sockaddr_in6 v6; | |
1280 | } *sa = ptr; | |
1281 | ||
1282 | switch (sa->raw.sa_family) { | |
1283 | case AF_INET: | |
1284 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1285 | case AF_INET6: | |
1286 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1287 | default: | |
1288 | return string(buf, end, "(invalid address)", spec); | |
1289 | }} | |
8a27f7c9 | 1290 | } |
fef20d9c | 1291 | break; |
9ac6e44e JP |
1292 | case 'U': |
1293 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1294 | case 'V': |
5756b76e JB |
1295 | { |
1296 | va_list va; | |
1297 | ||
1298 | va_copy(va, *((struct va_format *)ptr)->va); | |
1299 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1300 | ((struct va_format *)ptr)->fmt, va); | |
1301 | va_end(va); | |
1302 | return buf; | |
1303 | } | |
455cd5ab DR |
1304 | case 'K': |
1305 | /* | |
1306 | * %pK cannot be used in IRQ context because its test | |
1307 | * for CAP_SYSLOG would be meaningless. | |
1308 | */ | |
3715c530 DR |
1309 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1310 | in_nmi())) { | |
455cd5ab | 1311 | if (spec.field_width == -1) |
725fe002 | 1312 | spec.field_width = default_width; |
455cd5ab | 1313 | return string(buf, end, "pK-error", spec); |
455cd5ab | 1314 | } |
26297607 JP |
1315 | if (!((kptr_restrict == 0) || |
1316 | (kptr_restrict == 1 && | |
1317 | has_capability_noaudit(current, CAP_SYSLOG)))) | |
1318 | ptr = NULL; | |
1319 | break; | |
c8f44aff MM |
1320 | case 'N': |
1321 | switch (fmt[1]) { | |
1322 | case 'F': | |
1323 | return netdev_feature_string(buf, end, ptr, spec); | |
1324 | } | |
1325 | break; | |
7d799210 SM |
1326 | case 'a': |
1327 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1328 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1329 | spec.base = 16; | |
1330 | return number(buf, end, | |
1331 | (unsigned long long) *((phys_addr_t *)ptr), spec); | |
4b6ccca7 AV |
1332 | case 'd': |
1333 | return dentry_name(buf, end, ptr, spec, fmt); | |
1334 | case 'D': | |
1335 | return dentry_name(buf, end, | |
1336 | ((const struct file *)ptr)->f_path.dentry, | |
1337 | spec, fmt); | |
fef20d9c FW |
1338 | } |
1339 | spec.flags |= SMALL; | |
1340 | if (spec.field_width == -1) { | |
725fe002 | 1341 | spec.field_width = default_width; |
fef20d9c FW |
1342 | spec.flags |= ZEROPAD; |
1343 | } | |
1344 | spec.base = 16; | |
1345 | ||
1346 | return number(buf, end, (unsigned long) ptr, spec); | |
1347 | } | |
1348 | ||
1349 | /* | |
1350 | * Helper function to decode printf style format. | |
1351 | * Each call decode a token from the format and return the | |
1352 | * number of characters read (or likely the delta where it wants | |
1353 | * to go on the next call). | |
1354 | * The decoded token is returned through the parameters | |
1355 | * | |
1356 | * 'h', 'l', or 'L' for integer fields | |
1357 | * 'z' support added 23/7/1999 S.H. | |
1358 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1359 | * 't' added for ptrdiff_t | |
1360 | * | |
1361 | * @fmt: the format string | |
1362 | * @type of the token returned | |
1363 | * @flags: various flags such as +, -, # tokens.. | |
1364 | * @field_width: overwritten width | |
1365 | * @base: base of the number (octal, hex, ...) | |
1366 | * @precision: precision of a number | |
1367 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1368 | */ | |
cf3b429b JP |
1369 | static noinline_for_stack |
1370 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1371 | { |
1372 | const char *start = fmt; | |
fef20d9c FW |
1373 | |
1374 | /* we finished early by reading the field width */ | |
ed681a91 | 1375 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1376 | if (spec->field_width < 0) { |
1377 | spec->field_width = -spec->field_width; | |
1378 | spec->flags |= LEFT; | |
1379 | } | |
1380 | spec->type = FORMAT_TYPE_NONE; | |
1381 | goto precision; | |
1382 | } | |
1383 | ||
1384 | /* we finished early by reading the precision */ | |
1385 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1386 | if (spec->precision < 0) | |
1387 | spec->precision = 0; | |
1388 | ||
1389 | spec->type = FORMAT_TYPE_NONE; | |
1390 | goto qualifier; | |
1391 | } | |
1392 | ||
1393 | /* By default */ | |
1394 | spec->type = FORMAT_TYPE_NONE; | |
1395 | ||
1396 | for (; *fmt ; ++fmt) { | |
1397 | if (*fmt == '%') | |
1398 | break; | |
1399 | } | |
1400 | ||
1401 | /* Return the current non-format string */ | |
1402 | if (fmt != start || !*fmt) | |
1403 | return fmt - start; | |
1404 | ||
1405 | /* Process flags */ | |
1406 | spec->flags = 0; | |
1407 | ||
1408 | while (1) { /* this also skips first '%' */ | |
1409 | bool found = true; | |
1410 | ||
1411 | ++fmt; | |
1412 | ||
1413 | switch (*fmt) { | |
1414 | case '-': spec->flags |= LEFT; break; | |
1415 | case '+': spec->flags |= PLUS; break; | |
1416 | case ' ': spec->flags |= SPACE; break; | |
1417 | case '#': spec->flags |= SPECIAL; break; | |
1418 | case '0': spec->flags |= ZEROPAD; break; | |
1419 | default: found = false; | |
1420 | } | |
1421 | ||
1422 | if (!found) | |
1423 | break; | |
1424 | } | |
1425 | ||
1426 | /* get field width */ | |
1427 | spec->field_width = -1; | |
1428 | ||
1429 | if (isdigit(*fmt)) | |
1430 | spec->field_width = skip_atoi(&fmt); | |
1431 | else if (*fmt == '*') { | |
1432 | /* it's the next argument */ | |
ed681a91 | 1433 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1434 | return ++fmt - start; |
1435 | } | |
1436 | ||
1437 | precision: | |
1438 | /* get the precision */ | |
1439 | spec->precision = -1; | |
1440 | if (*fmt == '.') { | |
1441 | ++fmt; | |
1442 | if (isdigit(*fmt)) { | |
1443 | spec->precision = skip_atoi(&fmt); | |
1444 | if (spec->precision < 0) | |
1445 | spec->precision = 0; | |
1446 | } else if (*fmt == '*') { | |
1447 | /* it's the next argument */ | |
adf26f84 | 1448 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1449 | return ++fmt - start; |
1450 | } | |
1451 | } | |
1452 | ||
1453 | qualifier: | |
1454 | /* get the conversion qualifier */ | |
1455 | spec->qualifier = -1; | |
75fb8f26 AS |
1456 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1457 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1458 | spec->qualifier = *fmt++; |
1459 | if (unlikely(spec->qualifier == *fmt)) { | |
1460 | if (spec->qualifier == 'l') { | |
1461 | spec->qualifier = 'L'; | |
1462 | ++fmt; | |
1463 | } else if (spec->qualifier == 'h') { | |
1464 | spec->qualifier = 'H'; | |
1465 | ++fmt; | |
1466 | } | |
fef20d9c FW |
1467 | } |
1468 | } | |
1469 | ||
1470 | /* default base */ | |
1471 | spec->base = 10; | |
1472 | switch (*fmt) { | |
1473 | case 'c': | |
1474 | spec->type = FORMAT_TYPE_CHAR; | |
1475 | return ++fmt - start; | |
1476 | ||
1477 | case 's': | |
1478 | spec->type = FORMAT_TYPE_STR; | |
1479 | return ++fmt - start; | |
1480 | ||
1481 | case 'p': | |
1482 | spec->type = FORMAT_TYPE_PTR; | |
1483 | return fmt - start; | |
1484 | /* skip alnum */ | |
1485 | ||
1486 | case 'n': | |
1487 | spec->type = FORMAT_TYPE_NRCHARS; | |
1488 | return ++fmt - start; | |
1489 | ||
1490 | case '%': | |
1491 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1492 | return ++fmt - start; | |
1493 | ||
1494 | /* integer number formats - set up the flags and "break" */ | |
1495 | case 'o': | |
1496 | spec->base = 8; | |
1497 | break; | |
1498 | ||
1499 | case 'x': | |
1500 | spec->flags |= SMALL; | |
1501 | ||
1502 | case 'X': | |
1503 | spec->base = 16; | |
1504 | break; | |
1505 | ||
1506 | case 'd': | |
1507 | case 'i': | |
39e874f8 | 1508 | spec->flags |= SIGN; |
fef20d9c | 1509 | case 'u': |
4aa99606 | 1510 | break; |
fef20d9c FW |
1511 | |
1512 | default: | |
1513 | spec->type = FORMAT_TYPE_INVALID; | |
1514 | return fmt - start; | |
0fe1ef24 | 1515 | } |
fef20d9c FW |
1516 | |
1517 | if (spec->qualifier == 'L') | |
1518 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1519 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1520 | if (spec->flags & SIGN) |
fef20d9c FW |
1521 | spec->type = FORMAT_TYPE_LONG; |
1522 | else | |
1523 | spec->type = FORMAT_TYPE_ULONG; | |
75fb8f26 | 1524 | } else if (_tolower(spec->qualifier) == 'z') { |
fef20d9c FW |
1525 | spec->type = FORMAT_TYPE_SIZE_T; |
1526 | } else if (spec->qualifier == 't') { | |
1527 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1528 | } else if (spec->qualifier == 'H') { |
1529 | if (spec->flags & SIGN) | |
1530 | spec->type = FORMAT_TYPE_BYTE; | |
1531 | else | |
1532 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1533 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1534 | if (spec->flags & SIGN) |
fef20d9c FW |
1535 | spec->type = FORMAT_TYPE_SHORT; |
1536 | else | |
1537 | spec->type = FORMAT_TYPE_USHORT; | |
1538 | } else { | |
39e874f8 | 1539 | if (spec->flags & SIGN) |
fef20d9c FW |
1540 | spec->type = FORMAT_TYPE_INT; |
1541 | else | |
1542 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1543 | } |
fef20d9c FW |
1544 | |
1545 | return ++fmt - start; | |
78a8bf69 LT |
1546 | } |
1547 | ||
1da177e4 LT |
1548 | /** |
1549 | * vsnprintf - Format a string and place it in a buffer | |
1550 | * @buf: The buffer to place the result into | |
1551 | * @size: The size of the buffer, including the trailing null space | |
1552 | * @fmt: The format string to use | |
1553 | * @args: Arguments for the format string | |
1554 | * | |
20036fdc | 1555 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1556 | * %pS output the name of a text symbol with offset |
1557 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1558 | * %pF output the name of a function pointer with its offset |
1559 | * %pf output the name of a function pointer without its offset | |
0f77a8d3 | 1560 | * %pB output the name of a backtrace symbol with its offset |
8a79503a UKK |
1561 | * %pR output the address range in a struct resource with decoded flags |
1562 | * %pr output the address range in a struct resource with raw flags | |
1563 | * %pM output a 6-byte MAC address with colons | |
7c59154e AS |
1564 | * %pMR output a 6-byte MAC address with colons in reversed order |
1565 | * %pMF output a 6-byte MAC address with dashes | |
8a79503a | 1566 | * %pm output a 6-byte MAC address without colons |
7c59154e | 1567 | * %pmR output a 6-byte MAC address without colons in reversed order |
8a79503a UKK |
1568 | * %pI4 print an IPv4 address without leading zeros |
1569 | * %pi4 print an IPv4 address with leading zeros | |
1570 | * %pI6 print an IPv6 address with colons | |
1571 | * %pi6 print an IPv6 address without colons | |
f996f208 | 1572 | * %pI6c print an IPv6 address as specified by RFC 5952 |
10679643 DB |
1573 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address |
1574 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address | |
8a79503a UKK |
1575 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1576 | * case. | |
31550a16 AS |
1577 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 |
1578 | * bytes of the input) | |
0efb4d20 | 1579 | * %n is ignored |
20036fdc | 1580 | * |
80f548e0 AM |
1581 | * ** Please update Documentation/printk-formats.txt when making changes ** |
1582 | * | |
1da177e4 LT |
1583 | * The return value is the number of characters which would |
1584 | * be generated for the given input, excluding the trailing | |
1585 | * '\0', as per ISO C99. If you want to have the exact | |
1586 | * number of characters written into @buf as return value | |
72fd4a35 | 1587 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1588 | * return is greater than or equal to @size, the resulting |
1589 | * string is truncated. | |
1590 | * | |
ba1835eb | 1591 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1592 | */ |
1593 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1594 | { | |
1da177e4 | 1595 | unsigned long long num; |
d4be151b | 1596 | char *str, *end; |
fef20d9c | 1597 | struct printf_spec spec = {0}; |
1da177e4 | 1598 | |
f796937a JF |
1599 | /* Reject out-of-range values early. Large positive sizes are |
1600 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1601 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1602 | return 0; |
1da177e4 LT |
1603 | |
1604 | str = buf; | |
f796937a | 1605 | end = buf + size; |
1da177e4 | 1606 | |
f796937a JF |
1607 | /* Make sure end is always >= buf */ |
1608 | if (end < buf) { | |
1609 | end = ((void *)-1); | |
1610 | size = end - buf; | |
1da177e4 LT |
1611 | } |
1612 | ||
fef20d9c FW |
1613 | while (*fmt) { |
1614 | const char *old_fmt = fmt; | |
d4be151b | 1615 | int read = format_decode(fmt, &spec); |
1da177e4 | 1616 | |
fef20d9c | 1617 | fmt += read; |
1da177e4 | 1618 | |
fef20d9c FW |
1619 | switch (spec.type) { |
1620 | case FORMAT_TYPE_NONE: { | |
1621 | int copy = read; | |
1622 | if (str < end) { | |
1623 | if (copy > end - str) | |
1624 | copy = end - str; | |
1625 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1626 | } |
fef20d9c FW |
1627 | str += read; |
1628 | break; | |
1da177e4 LT |
1629 | } |
1630 | ||
ed681a91 | 1631 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1632 | spec.field_width = va_arg(args, int); |
1633 | break; | |
1da177e4 | 1634 | |
fef20d9c FW |
1635 | case FORMAT_TYPE_PRECISION: |
1636 | spec.precision = va_arg(args, int); | |
1637 | break; | |
1da177e4 | 1638 | |
d4be151b AGR |
1639 | case FORMAT_TYPE_CHAR: { |
1640 | char c; | |
1641 | ||
fef20d9c FW |
1642 | if (!(spec.flags & LEFT)) { |
1643 | while (--spec.field_width > 0) { | |
f796937a | 1644 | if (str < end) |
1da177e4 LT |
1645 | *str = ' '; |
1646 | ++str; | |
1da177e4 | 1647 | |
fef20d9c FW |
1648 | } |
1649 | } | |
1650 | c = (unsigned char) va_arg(args, int); | |
1651 | if (str < end) | |
1652 | *str = c; | |
1653 | ++str; | |
1654 | while (--spec.field_width > 0) { | |
f796937a | 1655 | if (str < end) |
fef20d9c | 1656 | *str = ' '; |
1da177e4 | 1657 | ++str; |
fef20d9c FW |
1658 | } |
1659 | break; | |
d4be151b | 1660 | } |
1da177e4 | 1661 | |
fef20d9c FW |
1662 | case FORMAT_TYPE_STR: |
1663 | str = string(str, end, va_arg(args, char *), spec); | |
1664 | break; | |
1da177e4 | 1665 | |
fef20d9c FW |
1666 | case FORMAT_TYPE_PTR: |
1667 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1668 | spec); | |
1669 | while (isalnum(*fmt)) | |
1670 | fmt++; | |
1671 | break; | |
1da177e4 | 1672 | |
fef20d9c FW |
1673 | case FORMAT_TYPE_PERCENT_CHAR: |
1674 | if (str < end) | |
1675 | *str = '%'; | |
1676 | ++str; | |
1677 | break; | |
1da177e4 | 1678 | |
fef20d9c FW |
1679 | case FORMAT_TYPE_INVALID: |
1680 | if (str < end) | |
1681 | *str = '%'; | |
1682 | ++str; | |
fef20d9c FW |
1683 | break; |
1684 | ||
1685 | case FORMAT_TYPE_NRCHARS: { | |
ef0658f3 | 1686 | u8 qualifier = spec.qualifier; |
fef20d9c FW |
1687 | |
1688 | if (qualifier == 'l') { | |
1689 | long *ip = va_arg(args, long *); | |
1690 | *ip = (str - buf); | |
75fb8f26 | 1691 | } else if (_tolower(qualifier) == 'z') { |
fef20d9c FW |
1692 | size_t *ip = va_arg(args, size_t *); |
1693 | *ip = (str - buf); | |
1694 | } else { | |
1695 | int *ip = va_arg(args, int *); | |
1696 | *ip = (str - buf); | |
1697 | } | |
1698 | break; | |
1da177e4 | 1699 | } |
fef20d9c FW |
1700 | |
1701 | default: | |
1702 | switch (spec.type) { | |
1703 | case FORMAT_TYPE_LONG_LONG: | |
1704 | num = va_arg(args, long long); | |
1705 | break; | |
1706 | case FORMAT_TYPE_ULONG: | |
1707 | num = va_arg(args, unsigned long); | |
1708 | break; | |
1709 | case FORMAT_TYPE_LONG: | |
1710 | num = va_arg(args, long); | |
1711 | break; | |
1712 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
1713 | if (spec.flags & SIGN) |
1714 | num = va_arg(args, ssize_t); | |
1715 | else | |
1716 | num = va_arg(args, size_t); | |
fef20d9c FW |
1717 | break; |
1718 | case FORMAT_TYPE_PTRDIFF: | |
1719 | num = va_arg(args, ptrdiff_t); | |
1720 | break; | |
a4e94ef0 Z |
1721 | case FORMAT_TYPE_UBYTE: |
1722 | num = (unsigned char) va_arg(args, int); | |
1723 | break; | |
1724 | case FORMAT_TYPE_BYTE: | |
1725 | num = (signed char) va_arg(args, int); | |
1726 | break; | |
fef20d9c FW |
1727 | case FORMAT_TYPE_USHORT: |
1728 | num = (unsigned short) va_arg(args, int); | |
1729 | break; | |
1730 | case FORMAT_TYPE_SHORT: | |
1731 | num = (short) va_arg(args, int); | |
1732 | break; | |
39e874f8 FW |
1733 | case FORMAT_TYPE_INT: |
1734 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1735 | break; |
1736 | default: | |
1737 | num = va_arg(args, unsigned int); | |
1738 | } | |
1739 | ||
1740 | str = number(str, end, num, spec); | |
1da177e4 | 1741 | } |
1da177e4 | 1742 | } |
fef20d9c | 1743 | |
f796937a JF |
1744 | if (size > 0) { |
1745 | if (str < end) | |
1746 | *str = '\0'; | |
1747 | else | |
0a6047ee | 1748 | end[-1] = '\0'; |
f796937a | 1749 | } |
fef20d9c | 1750 | |
f796937a | 1751 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1752 | return str-buf; |
fef20d9c | 1753 | |
1da177e4 | 1754 | } |
1da177e4 LT |
1755 | EXPORT_SYMBOL(vsnprintf); |
1756 | ||
1757 | /** | |
1758 | * vscnprintf - Format a string and place it in a buffer | |
1759 | * @buf: The buffer to place the result into | |
1760 | * @size: The size of the buffer, including the trailing null space | |
1761 | * @fmt: The format string to use | |
1762 | * @args: Arguments for the format string | |
1763 | * | |
1764 | * The return value is the number of characters which have been written into | |
b921c69f | 1765 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
1766 | * returns 0. |
1767 | * | |
ba1835eb | 1768 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
1769 | * |
1770 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1771 | */ |
1772 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1773 | { | |
1774 | int i; | |
1775 | ||
7b9186f5 AGR |
1776 | i = vsnprintf(buf, size, fmt, args); |
1777 | ||
b921c69f AA |
1778 | if (likely(i < size)) |
1779 | return i; | |
1780 | if (size != 0) | |
1781 | return size - 1; | |
1782 | return 0; | |
1da177e4 | 1783 | } |
1da177e4 LT |
1784 | EXPORT_SYMBOL(vscnprintf); |
1785 | ||
1786 | /** | |
1787 | * snprintf - Format a string and place it in a buffer | |
1788 | * @buf: The buffer to place the result into | |
1789 | * @size: The size of the buffer, including the trailing null space | |
1790 | * @fmt: The format string to use | |
1791 | * @...: Arguments for the format string | |
1792 | * | |
1793 | * The return value is the number of characters which would be | |
1794 | * generated for the given input, excluding the trailing null, | |
1795 | * as per ISO C99. If the return is greater than or equal to | |
1796 | * @size, the resulting string is truncated. | |
20036fdc AK |
1797 | * |
1798 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1799 | */ |
7b9186f5 | 1800 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1801 | { |
1802 | va_list args; | |
1803 | int i; | |
1804 | ||
1805 | va_start(args, fmt); | |
7b9186f5 | 1806 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1807 | va_end(args); |
7b9186f5 | 1808 | |
1da177e4 LT |
1809 | return i; |
1810 | } | |
1da177e4 LT |
1811 | EXPORT_SYMBOL(snprintf); |
1812 | ||
1813 | /** | |
1814 | * scnprintf - Format a string and place it in a buffer | |
1815 | * @buf: The buffer to place the result into | |
1816 | * @size: The size of the buffer, including the trailing null space | |
1817 | * @fmt: The format string to use | |
1818 | * @...: Arguments for the format string | |
1819 | * | |
1820 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 1821 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
1822 | */ |
1823 | ||
7b9186f5 | 1824 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1825 | { |
1826 | va_list args; | |
1827 | int i; | |
1828 | ||
1829 | va_start(args, fmt); | |
b921c69f | 1830 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 1831 | va_end(args); |
7b9186f5 | 1832 | |
b921c69f | 1833 | return i; |
1da177e4 LT |
1834 | } |
1835 | EXPORT_SYMBOL(scnprintf); | |
1836 | ||
1837 | /** | |
1838 | * vsprintf - Format a string and place it in a buffer | |
1839 | * @buf: The buffer to place the result into | |
1840 | * @fmt: The format string to use | |
1841 | * @args: Arguments for the format string | |
1842 | * | |
1843 | * The function returns the number of characters written | |
72fd4a35 | 1844 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1845 | * buffer overflows. |
1846 | * | |
ba1835eb | 1847 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
1848 | * |
1849 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1850 | */ |
1851 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1852 | { | |
1853 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1854 | } | |
1da177e4 LT |
1855 | EXPORT_SYMBOL(vsprintf); |
1856 | ||
1857 | /** | |
1858 | * sprintf - Format a string and place it in a buffer | |
1859 | * @buf: The buffer to place the result into | |
1860 | * @fmt: The format string to use | |
1861 | * @...: Arguments for the format string | |
1862 | * | |
1863 | * The function returns the number of characters written | |
72fd4a35 | 1864 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1865 | * buffer overflows. |
20036fdc AK |
1866 | * |
1867 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1868 | */ |
7b9186f5 | 1869 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
1870 | { |
1871 | va_list args; | |
1872 | int i; | |
1873 | ||
1874 | va_start(args, fmt); | |
7b9186f5 | 1875 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 1876 | va_end(args); |
7b9186f5 | 1877 | |
1da177e4 LT |
1878 | return i; |
1879 | } | |
1da177e4 LT |
1880 | EXPORT_SYMBOL(sprintf); |
1881 | ||
4370aa4a LJ |
1882 | #ifdef CONFIG_BINARY_PRINTF |
1883 | /* | |
1884 | * bprintf service: | |
1885 | * vbin_printf() - VA arguments to binary data | |
1886 | * bstr_printf() - Binary data to text string | |
1887 | */ | |
1888 | ||
1889 | /** | |
1890 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1891 | * @bin_buf: The buffer to place args' binary value | |
1892 | * @size: The size of the buffer(by words(32bits), not characters) | |
1893 | * @fmt: The format string to use | |
1894 | * @args: Arguments for the format string | |
1895 | * | |
1896 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1897 | * is skiped. | |
1898 | * | |
1899 | * The return value is the number of words(32bits) which would be generated for | |
1900 | * the given input. | |
1901 | * | |
1902 | * NOTE: | |
1903 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1904 | * valid for bstr_printf(). | |
1905 | */ | |
1906 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1907 | { | |
fef20d9c | 1908 | struct printf_spec spec = {0}; |
4370aa4a | 1909 | char *str, *end; |
4370aa4a LJ |
1910 | |
1911 | str = (char *)bin_buf; | |
1912 | end = (char *)(bin_buf + size); | |
1913 | ||
1914 | #define save_arg(type) \ | |
1915 | do { \ | |
1916 | if (sizeof(type) == 8) { \ | |
1917 | unsigned long long value; \ | |
1918 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1919 | value = va_arg(args, unsigned long long); \ | |
1920 | if (str + sizeof(type) <= end) { \ | |
1921 | *(u32 *)str = *(u32 *)&value; \ | |
1922 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1923 | } \ | |
1924 | } else { \ | |
1925 | unsigned long value; \ | |
1926 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1927 | value = va_arg(args, int); \ | |
1928 | if (str + sizeof(type) <= end) \ | |
1929 | *(typeof(type) *)str = (type)value; \ | |
1930 | } \ | |
1931 | str += sizeof(type); \ | |
1932 | } while (0) | |
1933 | ||
fef20d9c | 1934 | while (*fmt) { |
d4be151b | 1935 | int read = format_decode(fmt, &spec); |
4370aa4a | 1936 | |
fef20d9c | 1937 | fmt += read; |
4370aa4a | 1938 | |
fef20d9c FW |
1939 | switch (spec.type) { |
1940 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
1941 | case FORMAT_TYPE_INVALID: |
1942 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
1943 | break; |
1944 | ||
ed681a91 | 1945 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1946 | case FORMAT_TYPE_PRECISION: |
1947 | save_arg(int); | |
1948 | break; | |
1949 | ||
1950 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1951 | save_arg(char); |
fef20d9c FW |
1952 | break; |
1953 | ||
1954 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1955 | const char *save_str = va_arg(args, char *); |
1956 | size_t len; | |
6c356634 | 1957 | |
4370aa4a LJ |
1958 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1959 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 1960 | save_str = "(null)"; |
6c356634 AGR |
1961 | len = strlen(save_str) + 1; |
1962 | if (str + len < end) | |
1963 | memcpy(str, save_str, len); | |
1964 | str += len; | |
fef20d9c | 1965 | break; |
4370aa4a | 1966 | } |
fef20d9c FW |
1967 | |
1968 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1969 | save_arg(void *); |
1970 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1971 | while (isalnum(*fmt)) |
4370aa4a | 1972 | fmt++; |
fef20d9c FW |
1973 | break; |
1974 | ||
fef20d9c | 1975 | case FORMAT_TYPE_NRCHARS: { |
4370aa4a | 1976 | /* skip %n 's argument */ |
ef0658f3 | 1977 | u8 qualifier = spec.qualifier; |
4370aa4a LJ |
1978 | void *skip_arg; |
1979 | if (qualifier == 'l') | |
1980 | skip_arg = va_arg(args, long *); | |
75fb8f26 | 1981 | else if (_tolower(qualifier) == 'z') |
4370aa4a LJ |
1982 | skip_arg = va_arg(args, size_t *); |
1983 | else | |
1984 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1985 | break; |
4370aa4a | 1986 | } |
fef20d9c FW |
1987 | |
1988 | default: | |
1989 | switch (spec.type) { | |
1990 | ||
1991 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1992 | save_arg(long long); |
fef20d9c FW |
1993 | break; |
1994 | case FORMAT_TYPE_ULONG: | |
1995 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1996 | save_arg(unsigned long); |
fef20d9c FW |
1997 | break; |
1998 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1999 | save_arg(size_t); |
fef20d9c FW |
2000 | break; |
2001 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2002 | save_arg(ptrdiff_t); |
fef20d9c | 2003 | break; |
a4e94ef0 Z |
2004 | case FORMAT_TYPE_UBYTE: |
2005 | case FORMAT_TYPE_BYTE: | |
2006 | save_arg(char); | |
2007 | break; | |
fef20d9c FW |
2008 | case FORMAT_TYPE_USHORT: |
2009 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2010 | save_arg(short); |
fef20d9c FW |
2011 | break; |
2012 | default: | |
4370aa4a | 2013 | save_arg(int); |
fef20d9c | 2014 | } |
4370aa4a LJ |
2015 | } |
2016 | } | |
fef20d9c | 2017 | |
7b9186f5 | 2018 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2019 | #undef save_arg |
4370aa4a LJ |
2020 | } |
2021 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2022 | ||
2023 | /** | |
2024 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2025 | * @buf: The buffer to place the result into | |
2026 | * @size: The size of the buffer, including the trailing null space | |
2027 | * @fmt: The format string to use | |
2028 | * @bin_buf: Binary arguments for the format string | |
2029 | * | |
2030 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2031 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2032 | * a binary buffer that generated by vbin_printf. | |
2033 | * | |
2034 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2035 | * see vsnprintf comment for details. |
4370aa4a LJ |
2036 | * |
2037 | * The return value is the number of characters which would | |
2038 | * be generated for the given input, excluding the trailing | |
2039 | * '\0', as per ISO C99. If you want to have the exact | |
2040 | * number of characters written into @buf as return value | |
2041 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2042 | * return is greater than or equal to @size, the resulting | |
2043 | * string is truncated. | |
2044 | */ | |
2045 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2046 | { | |
fef20d9c | 2047 | struct printf_spec spec = {0}; |
d4be151b AGR |
2048 | char *str, *end; |
2049 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2050 | |
2f30b1f9 | 2051 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 2052 | return 0; |
4370aa4a LJ |
2053 | |
2054 | str = buf; | |
2055 | end = buf + size; | |
2056 | ||
2057 | #define get_arg(type) \ | |
2058 | ({ \ | |
2059 | typeof(type) value; \ | |
2060 | if (sizeof(type) == 8) { \ | |
2061 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2062 | *(u32 *)&value = *(u32 *)args; \ | |
2063 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2064 | } else { \ | |
2065 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2066 | value = *(typeof(type) *)args; \ | |
2067 | } \ | |
2068 | args += sizeof(type); \ | |
2069 | value; \ | |
2070 | }) | |
2071 | ||
2072 | /* Make sure end is always >= buf */ | |
2073 | if (end < buf) { | |
2074 | end = ((void *)-1); | |
2075 | size = end - buf; | |
2076 | } | |
2077 | ||
fef20d9c | 2078 | while (*fmt) { |
fef20d9c | 2079 | const char *old_fmt = fmt; |
d4be151b | 2080 | int read = format_decode(fmt, &spec); |
4370aa4a | 2081 | |
fef20d9c | 2082 | fmt += read; |
4370aa4a | 2083 | |
fef20d9c FW |
2084 | switch (spec.type) { |
2085 | case FORMAT_TYPE_NONE: { | |
2086 | int copy = read; | |
2087 | if (str < end) { | |
2088 | if (copy > end - str) | |
2089 | copy = end - str; | |
2090 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2091 | } |
fef20d9c FW |
2092 | str += read; |
2093 | break; | |
4370aa4a LJ |
2094 | } |
2095 | ||
ed681a91 | 2096 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2097 | spec.field_width = get_arg(int); |
2098 | break; | |
4370aa4a | 2099 | |
fef20d9c FW |
2100 | case FORMAT_TYPE_PRECISION: |
2101 | spec.precision = get_arg(int); | |
2102 | break; | |
4370aa4a | 2103 | |
d4be151b AGR |
2104 | case FORMAT_TYPE_CHAR: { |
2105 | char c; | |
2106 | ||
fef20d9c FW |
2107 | if (!(spec.flags & LEFT)) { |
2108 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2109 | if (str < end) |
2110 | *str = ' '; | |
2111 | ++str; | |
2112 | } | |
2113 | } | |
2114 | c = (unsigned char) get_arg(char); | |
2115 | if (str < end) | |
2116 | *str = c; | |
2117 | ++str; | |
fef20d9c | 2118 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2119 | if (str < end) |
2120 | *str = ' '; | |
2121 | ++str; | |
2122 | } | |
fef20d9c | 2123 | break; |
d4be151b | 2124 | } |
4370aa4a | 2125 | |
fef20d9c | 2126 | case FORMAT_TYPE_STR: { |
4370aa4a | 2127 | const char *str_arg = args; |
d4be151b | 2128 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2129 | str = string(str, end, (char *)str_arg, spec); |
2130 | break; | |
4370aa4a LJ |
2131 | } |
2132 | ||
fef20d9c FW |
2133 | case FORMAT_TYPE_PTR: |
2134 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
2135 | while (isalnum(*fmt)) | |
4370aa4a | 2136 | fmt++; |
fef20d9c | 2137 | break; |
4370aa4a | 2138 | |
fef20d9c | 2139 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2140 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
2141 | if (str < end) |
2142 | *str = '%'; | |
2143 | ++str; | |
fef20d9c FW |
2144 | break; |
2145 | ||
2146 | case FORMAT_TYPE_NRCHARS: | |
2147 | /* skip */ | |
2148 | break; | |
2149 | ||
d4be151b AGR |
2150 | default: { |
2151 | unsigned long long num; | |
2152 | ||
fef20d9c FW |
2153 | switch (spec.type) { |
2154 | ||
2155 | case FORMAT_TYPE_LONG_LONG: | |
2156 | num = get_arg(long long); | |
2157 | break; | |
2158 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2159 | case FORMAT_TYPE_LONG: |
2160 | num = get_arg(unsigned long); | |
2161 | break; | |
2162 | case FORMAT_TYPE_SIZE_T: | |
2163 | num = get_arg(size_t); | |
2164 | break; | |
2165 | case FORMAT_TYPE_PTRDIFF: | |
2166 | num = get_arg(ptrdiff_t); | |
2167 | break; | |
a4e94ef0 Z |
2168 | case FORMAT_TYPE_UBYTE: |
2169 | num = get_arg(unsigned char); | |
2170 | break; | |
2171 | case FORMAT_TYPE_BYTE: | |
2172 | num = get_arg(signed char); | |
2173 | break; | |
fef20d9c FW |
2174 | case FORMAT_TYPE_USHORT: |
2175 | num = get_arg(unsigned short); | |
2176 | break; | |
2177 | case FORMAT_TYPE_SHORT: | |
2178 | num = get_arg(short); | |
2179 | break; | |
2180 | case FORMAT_TYPE_UINT: | |
2181 | num = get_arg(unsigned int); | |
2182 | break; | |
2183 | default: | |
2184 | num = get_arg(int); | |
2185 | } | |
2186 | ||
2187 | str = number(str, end, num, spec); | |
d4be151b AGR |
2188 | } /* default: */ |
2189 | } /* switch(spec.type) */ | |
2190 | } /* while(*fmt) */ | |
fef20d9c | 2191 | |
4370aa4a LJ |
2192 | if (size > 0) { |
2193 | if (str < end) | |
2194 | *str = '\0'; | |
2195 | else | |
2196 | end[-1] = '\0'; | |
2197 | } | |
fef20d9c | 2198 | |
4370aa4a LJ |
2199 | #undef get_arg |
2200 | ||
2201 | /* the trailing null byte doesn't count towards the total */ | |
2202 | return str - buf; | |
2203 | } | |
2204 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2205 | ||
2206 | /** | |
2207 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2208 | * @bin_buf: The buffer to place args' binary value | |
2209 | * @size: The size of the buffer(by words(32bits), not characters) | |
2210 | * @fmt: The format string to use | |
2211 | * @...: Arguments for the format string | |
2212 | * | |
2213 | * The function returns the number of words(u32) written | |
2214 | * into @bin_buf. | |
2215 | */ | |
2216 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2217 | { | |
2218 | va_list args; | |
2219 | int ret; | |
2220 | ||
2221 | va_start(args, fmt); | |
2222 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2223 | va_end(args); | |
7b9186f5 | 2224 | |
4370aa4a LJ |
2225 | return ret; |
2226 | } | |
2227 | EXPORT_SYMBOL_GPL(bprintf); | |
2228 | ||
2229 | #endif /* CONFIG_BINARY_PRINTF */ | |
2230 | ||
1da177e4 LT |
2231 | /** |
2232 | * vsscanf - Unformat a buffer into a list of arguments | |
2233 | * @buf: input buffer | |
2234 | * @fmt: format of buffer | |
2235 | * @args: arguments | |
2236 | */ | |
7b9186f5 | 2237 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2238 | { |
2239 | const char *str = buf; | |
2240 | char *next; | |
2241 | char digit; | |
2242 | int num = 0; | |
ef0658f3 | 2243 | u8 qualifier; |
53809751 JB |
2244 | unsigned int base; |
2245 | union { | |
2246 | long long s; | |
2247 | unsigned long long u; | |
2248 | } val; | |
ef0658f3 | 2249 | s16 field_width; |
d4be151b | 2250 | bool is_sign; |
1da177e4 | 2251 | |
da99075c | 2252 | while (*fmt) { |
1da177e4 LT |
2253 | /* skip any white space in format */ |
2254 | /* white space in format matchs any amount of | |
2255 | * white space, including none, in the input. | |
2256 | */ | |
2257 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2258 | fmt = skip_spaces(++fmt); |
2259 | str = skip_spaces(str); | |
1da177e4 LT |
2260 | } |
2261 | ||
2262 | /* anything that is not a conversion must match exactly */ | |
2263 | if (*fmt != '%' && *fmt) { | |
2264 | if (*fmt++ != *str++) | |
2265 | break; | |
2266 | continue; | |
2267 | } | |
2268 | ||
2269 | if (!*fmt) | |
2270 | break; | |
2271 | ++fmt; | |
7b9186f5 | 2272 | |
1da177e4 LT |
2273 | /* skip this conversion. |
2274 | * advance both strings to next white space | |
2275 | */ | |
2276 | if (*fmt == '*') { | |
da99075c JB |
2277 | if (!*str) |
2278 | break; | |
8fccae2c | 2279 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
2280 | fmt++; |
2281 | while (!isspace(*str) && *str) | |
2282 | str++; | |
2283 | continue; | |
2284 | } | |
2285 | ||
2286 | /* get field width */ | |
2287 | field_width = -1; | |
53809751 | 2288 | if (isdigit(*fmt)) { |
1da177e4 | 2289 | field_width = skip_atoi(&fmt); |
53809751 JB |
2290 | if (field_width <= 0) |
2291 | break; | |
2292 | } | |
1da177e4 LT |
2293 | |
2294 | /* get conversion qualifier */ | |
2295 | qualifier = -1; | |
75fb8f26 AS |
2296 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2297 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
2298 | qualifier = *fmt++; |
2299 | if (unlikely(qualifier == *fmt)) { | |
2300 | if (qualifier == 'h') { | |
2301 | qualifier = 'H'; | |
2302 | fmt++; | |
2303 | } else if (qualifier == 'l') { | |
2304 | qualifier = 'L'; | |
2305 | fmt++; | |
2306 | } | |
2307 | } | |
2308 | } | |
1da177e4 | 2309 | |
da99075c JB |
2310 | if (!*fmt) |
2311 | break; | |
2312 | ||
2313 | if (*fmt == 'n') { | |
2314 | /* return number of characters read so far */ | |
2315 | *va_arg(args, int *) = str - buf; | |
2316 | ++fmt; | |
2317 | continue; | |
2318 | } | |
2319 | ||
2320 | if (!*str) | |
1da177e4 LT |
2321 | break; |
2322 | ||
d4be151b AGR |
2323 | base = 10; |
2324 | is_sign = 0; | |
2325 | ||
7b9186f5 | 2326 | switch (*fmt++) { |
1da177e4 LT |
2327 | case 'c': |
2328 | { | |
7b9186f5 | 2329 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2330 | if (field_width == -1) |
2331 | field_width = 1; | |
2332 | do { | |
2333 | *s++ = *str++; | |
2334 | } while (--field_width > 0 && *str); | |
2335 | num++; | |
2336 | } | |
2337 | continue; | |
2338 | case 's': | |
2339 | { | |
7b9186f5 AGR |
2340 | char *s = (char *)va_arg(args, char *); |
2341 | if (field_width == -1) | |
4be929be | 2342 | field_width = SHRT_MAX; |
1da177e4 | 2343 | /* first, skip leading white space in buffer */ |
e7d2860b | 2344 | str = skip_spaces(str); |
1da177e4 LT |
2345 | |
2346 | /* now copy until next white space */ | |
7b9186f5 | 2347 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2348 | *s++ = *str++; |
1da177e4 LT |
2349 | *s = '\0'; |
2350 | num++; | |
2351 | } | |
2352 | continue; | |
1da177e4 LT |
2353 | case 'o': |
2354 | base = 8; | |
2355 | break; | |
2356 | case 'x': | |
2357 | case 'X': | |
2358 | base = 16; | |
2359 | break; | |
2360 | case 'i': | |
7b9186f5 | 2361 | base = 0; |
1da177e4 LT |
2362 | case 'd': |
2363 | is_sign = 1; | |
2364 | case 'u': | |
2365 | break; | |
2366 | case '%': | |
2367 | /* looking for '%' in str */ | |
7b9186f5 | 2368 | if (*str++ != '%') |
1da177e4 LT |
2369 | return num; |
2370 | continue; | |
2371 | default: | |
2372 | /* invalid format; stop here */ | |
2373 | return num; | |
2374 | } | |
2375 | ||
2376 | /* have some sort of integer conversion. | |
2377 | * first, skip white space in buffer. | |
2378 | */ | |
e7d2860b | 2379 | str = skip_spaces(str); |
1da177e4 LT |
2380 | |
2381 | digit = *str; | |
2382 | if (is_sign && digit == '-') | |
2383 | digit = *(str + 1); | |
2384 | ||
2385 | if (!digit | |
7b9186f5 AGR |
2386 | || (base == 16 && !isxdigit(digit)) |
2387 | || (base == 10 && !isdigit(digit)) | |
2388 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2389 | || (base == 0 && !isdigit(digit))) | |
2390 | break; | |
1da177e4 | 2391 | |
53809751 JB |
2392 | if (is_sign) |
2393 | val.s = qualifier != 'L' ? | |
2394 | simple_strtol(str, &next, base) : | |
2395 | simple_strtoll(str, &next, base); | |
2396 | else | |
2397 | val.u = qualifier != 'L' ? | |
2398 | simple_strtoul(str, &next, base) : | |
2399 | simple_strtoull(str, &next, base); | |
2400 | ||
2401 | if (field_width > 0 && next - str > field_width) { | |
2402 | if (base == 0) | |
2403 | _parse_integer_fixup_radix(str, &base); | |
2404 | while (next - str > field_width) { | |
2405 | if (is_sign) | |
2406 | val.s = div_s64(val.s, base); | |
2407 | else | |
2408 | val.u = div_u64(val.u, base); | |
2409 | --next; | |
2410 | } | |
2411 | } | |
2412 | ||
7b9186f5 | 2413 | switch (qualifier) { |
1da177e4 | 2414 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2415 | if (is_sign) |
2416 | *va_arg(args, signed char *) = val.s; | |
2417 | else | |
2418 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2419 | break; |
2420 | case 'h': | |
53809751 JB |
2421 | if (is_sign) |
2422 | *va_arg(args, short *) = val.s; | |
2423 | else | |
2424 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2425 | break; |
2426 | case 'l': | |
53809751 JB |
2427 | if (is_sign) |
2428 | *va_arg(args, long *) = val.s; | |
2429 | else | |
2430 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2431 | break; |
2432 | case 'L': | |
53809751 JB |
2433 | if (is_sign) |
2434 | *va_arg(args, long long *) = val.s; | |
2435 | else | |
2436 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 LT |
2437 | break; |
2438 | case 'Z': | |
2439 | case 'z': | |
53809751 JB |
2440 | *va_arg(args, size_t *) = val.u; |
2441 | break; | |
1da177e4 | 2442 | default: |
53809751 JB |
2443 | if (is_sign) |
2444 | *va_arg(args, int *) = val.s; | |
2445 | else | |
2446 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
2447 | break; |
2448 | } | |
2449 | num++; | |
2450 | ||
2451 | if (!next) | |
2452 | break; | |
2453 | str = next; | |
2454 | } | |
c6b40d16 | 2455 | |
1da177e4 LT |
2456 | return num; |
2457 | } | |
1da177e4 LT |
2458 | EXPORT_SYMBOL(vsscanf); |
2459 | ||
2460 | /** | |
2461 | * sscanf - Unformat a buffer into a list of arguments | |
2462 | * @buf: input buffer | |
2463 | * @fmt: formatting of buffer | |
2464 | * @...: resulting arguments | |
2465 | */ | |
7b9186f5 | 2466 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2467 | { |
2468 | va_list args; | |
2469 | int i; | |
2470 | ||
7b9186f5 AGR |
2471 | va_start(args, fmt); |
2472 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2473 | va_end(args); |
7b9186f5 | 2474 | |
1da177e4 LT |
2475 | return i; |
2476 | } | |
1da177e4 | 2477 | EXPORT_SYMBOL(sscanf); |