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> | |
0d1d7a55 | 20 | #include <linux/clk.h> |
900cca29 | 21 | #include <linux/clk-provider.h> |
8bc3bcc9 | 22 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
23 | #include <linux/types.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/kernel.h> | |
0fe1ef24 | 27 | #include <linux/kallsyms.h> |
53809751 | 28 | #include <linux/math64.h> |
0fe1ef24 | 29 | #include <linux/uaccess.h> |
332d2e78 | 30 | #include <linux/ioport.h> |
4b6ccca7 | 31 | #include <linux/dcache.h> |
312b4e22 | 32 | #include <linux/cred.h> |
8a27f7c9 | 33 | #include <net/addrconf.h> |
1031bc58 DM |
34 | #ifdef CONFIG_BLOCK |
35 | #include <linux/blkdev.h> | |
36 | #endif | |
1da177e4 | 37 | |
4e57b681 | 38 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 39 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
7c43d9a3 | 40 | #include <asm/byteorder.h> /* cpu_to_le16 */ |
1da177e4 | 41 | |
71dca95d | 42 | #include <linux/string_helpers.h> |
1dff46d6 | 43 | #include "kstrtox.h" |
aa46a63e | 44 | |
1da177e4 | 45 | /** |
922ac25c | 46 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
47 | * @cp: The start of the string |
48 | * @endp: A pointer to the end of the parsed string will be placed here | |
49 | * @base: The number base to use | |
462e4711 EZ |
50 | * |
51 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 52 | */ |
922ac25c | 53 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 54 | { |
1dff46d6 AD |
55 | unsigned long long result; |
56 | unsigned int rv; | |
aa46a63e | 57 | |
1dff46d6 AD |
58 | cp = _parse_integer_fixup_radix(cp, &base); |
59 | rv = _parse_integer(cp, base, &result); | |
60 | /* FIXME */ | |
61 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 62 | |
1da177e4 LT |
63 | if (endp) |
64 | *endp = (char *)cp; | |
7b9186f5 | 65 | |
1da177e4 LT |
66 | return result; |
67 | } | |
922ac25c | 68 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
69 | |
70 | /** | |
922ac25c | 71 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
72 | * @cp: The start of the string |
73 | * @endp: A pointer to the end of the parsed string will be placed here | |
74 | * @base: The number base to use | |
462e4711 EZ |
75 | * |
76 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 77 | */ |
922ac25c | 78 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 79 | { |
922ac25c | 80 | return simple_strtoull(cp, endp, base); |
1da177e4 | 81 | } |
922ac25c | 82 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
83 | |
84 | /** | |
922ac25c | 85 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
86 | * @cp: The start of the string |
87 | * @endp: A pointer to the end of the parsed string will be placed here | |
88 | * @base: The number base to use | |
462e4711 EZ |
89 | * |
90 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 91 | */ |
922ac25c | 92 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 93 | { |
922ac25c AGR |
94 | if (*cp == '-') |
95 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 96 | |
922ac25c | 97 | return simple_strtoul(cp, endp, base); |
1da177e4 | 98 | } |
922ac25c | 99 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
100 | |
101 | /** | |
102 | * simple_strtoll - convert a string to a signed long long | |
103 | * @cp: The start of the string | |
104 | * @endp: A pointer to the end of the parsed string will be placed here | |
105 | * @base: The number base to use | |
462e4711 EZ |
106 | * |
107 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 108 | */ |
22d27051 | 109 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 110 | { |
7b9186f5 | 111 | if (*cp == '-') |
22d27051 | 112 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 113 | |
22d27051 | 114 | return simple_strtoull(cp, endp, base); |
1da177e4 | 115 | } |
98d5ce0d | 116 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 117 | |
cf3b429b JP |
118 | static noinline_for_stack |
119 | int skip_atoi(const char **s) | |
1da177e4 | 120 | { |
7b9186f5 | 121 | int i = 0; |
1da177e4 | 122 | |
43e5b666 | 123 | do { |
1da177e4 | 124 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 125 | } while (isdigit(**s)); |
7b9186f5 | 126 | |
1da177e4 LT |
127 | return i; |
128 | } | |
129 | ||
7c43d9a3 RV |
130 | /* |
131 | * Decimal conversion is by far the most typical, and is used for | |
132 | * /proc and /sys data. This directly impacts e.g. top performance | |
133 | * with many processes running. We optimize it for speed by emitting | |
134 | * two characters at a time, using a 200 byte lookup table. This | |
135 | * roughly halves the number of multiplications compared to computing | |
136 | * the digits one at a time. Implementation strongly inspired by the | |
137 | * previous version, which in turn used ideas described at | |
138 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
139 | * from the author, Douglas W. Jones). | |
140 | * | |
141 | * It turns out there is precisely one 26 bit fixed-point | |
142 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
143 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
144 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
145 | * irrelevant for our purpose. | |
146 | * | |
147 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
148 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
149 | * | |
150 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
151 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
152 | * for all x <= 43698. | |
133fd9f5 | 153 | */ |
4277eedd | 154 | |
7c43d9a3 RV |
155 | static const u16 decpair[100] = { |
156 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
157 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
158 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
159 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
160 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
161 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
162 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
163 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
164 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
165 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
166 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
167 | #undef _ | |
168 | }; | |
169 | ||
170 | /* | |
171 | * This will print a single '0' even if r == 0, since we would | |
675cf53c RV |
172 | * immediately jump to out_r where two 0s would be written but only |
173 | * one of them accounted for in buf. This is needed by ip4_string | |
174 | * below. All other callers pass a non-zero value of r. | |
7c43d9a3 | 175 | */ |
cf3b429b | 176 | static noinline_for_stack |
7c43d9a3 | 177 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 178 | { |
7c43d9a3 RV |
179 | unsigned q; |
180 | ||
181 | /* 1 <= r < 10^8 */ | |
182 | if (r < 100) | |
183 | goto out_r; | |
184 | ||
185 | /* 100 <= r < 10^8 */ | |
186 | q = (r * (u64)0x28f5c29) >> 32; | |
187 | *((u16 *)buf) = decpair[r - 100*q]; | |
188 | buf += 2; | |
189 | ||
190 | /* 1 <= q < 10^6 */ | |
191 | if (q < 100) | |
192 | goto out_q; | |
193 | ||
194 | /* 100 <= q < 10^6 */ | |
195 | r = (q * (u64)0x28f5c29) >> 32; | |
196 | *((u16 *)buf) = decpair[q - 100*r]; | |
197 | buf += 2; | |
198 | ||
199 | /* 1 <= r < 10^4 */ | |
200 | if (r < 100) | |
201 | goto out_r; | |
202 | ||
203 | /* 100 <= r < 10^4 */ | |
204 | q = (r * 0x147b) >> 19; | |
205 | *((u16 *)buf) = decpair[r - 100*q]; | |
206 | buf += 2; | |
207 | out_q: | |
208 | /* 1 <= q < 100 */ | |
209 | r = q; | |
210 | out_r: | |
211 | /* 1 <= r < 100 */ | |
212 | *((u16 *)buf) = decpair[r]; | |
675cf53c | 213 | buf += r < 10 ? 1 : 2; |
4277eedd DV |
214 | return buf; |
215 | } | |
133fd9f5 | 216 | |
7c43d9a3 | 217 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 |
cf3b429b | 218 | static noinline_for_stack |
7c43d9a3 | 219 | char *put_dec_full8(char *buf, unsigned r) |
4277eedd | 220 | { |
133fd9f5 DV |
221 | unsigned q; |
222 | ||
7c43d9a3 RV |
223 | /* 0 <= r < 10^8 */ |
224 | q = (r * (u64)0x28f5c29) >> 32; | |
225 | *((u16 *)buf) = decpair[r - 100*q]; | |
226 | buf += 2; | |
4277eedd | 227 | |
7c43d9a3 RV |
228 | /* 0 <= q < 10^6 */ |
229 | r = (q * (u64)0x28f5c29) >> 32; | |
230 | *((u16 *)buf) = decpair[q - 100*r]; | |
231 | buf += 2; | |
7b9186f5 | 232 | |
7c43d9a3 RV |
233 | /* 0 <= r < 10^4 */ |
234 | q = (r * 0x147b) >> 19; | |
235 | *((u16 *)buf) = decpair[r - 100*q]; | |
236 | buf += 2; | |
133fd9f5 | 237 | |
7c43d9a3 RV |
238 | /* 0 <= q < 100 */ |
239 | *((u16 *)buf) = decpair[q]; | |
240 | buf += 2; | |
241 | return buf; | |
242 | } | |
133fd9f5 | 243 | |
7c43d9a3 | 244 | static noinline_for_stack |
133fd9f5 DV |
245 | char *put_dec(char *buf, unsigned long long n) |
246 | { | |
7c43d9a3 RV |
247 | if (n >= 100*1000*1000) |
248 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
249 | /* 1 <= n <= 1.6e11 */ | |
250 | if (n >= 100*1000*1000) | |
251 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
252 | /* 1 <= n < 1e8 */ | |
133fd9f5 | 253 | return put_dec_trunc8(buf, n); |
4277eedd | 254 | } |
133fd9f5 | 255 | |
7c43d9a3 | 256 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 |
133fd9f5 | 257 | |
7c43d9a3 RV |
258 | static void |
259 | put_dec_full4(char *buf, unsigned r) | |
4277eedd | 260 | { |
7c43d9a3 RV |
261 | unsigned q; |
262 | ||
263 | /* 0 <= r < 10^4 */ | |
264 | q = (r * 0x147b) >> 19; | |
265 | *((u16 *)buf) = decpair[r - 100*q]; | |
266 | buf += 2; | |
267 | /* 0 <= q < 100 */ | |
268 | *((u16 *)buf) = decpair[q]; | |
2359172a GS |
269 | } |
270 | ||
271 | /* | |
272 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
273 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
274 | * holds for all x < 1,128,869,999. The largest value this | |
275 | * helper will ever be asked to convert is 1,125,520,955. | |
7c43d9a3 | 276 | * (second call in the put_dec code, assuming n is all-ones). |
2359172a | 277 | */ |
7c43d9a3 | 278 | static noinline_for_stack |
2359172a GS |
279 | unsigned put_dec_helper4(char *buf, unsigned x) |
280 | { | |
281 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
282 | ||
283 | put_dec_full4(buf, x - q * 10000); | |
284 | return q; | |
4277eedd DV |
285 | } |
286 | ||
133fd9f5 DV |
287 | /* Based on code by Douglas W. Jones found at |
288 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
289 | * (with permission from the author). | |
290 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
291 | */ | |
292 | static | |
293 | char *put_dec(char *buf, unsigned long long n) | |
294 | { | |
295 | uint32_t d3, d2, d1, q, h; | |
296 | ||
297 | if (n < 100*1000*1000) | |
298 | return put_dec_trunc8(buf, n); | |
299 | ||
300 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
301 | h = (n >> 32); | |
302 | d2 = (h ) & 0xffff; | |
303 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
304 | ||
7c43d9a3 RV |
305 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 |
306 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
133fd9f5 | 307 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
2359172a GS |
308 | q = put_dec_helper4(buf, q); |
309 | ||
310 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
311 | q = put_dec_helper4(buf+4, q); | |
312 | ||
313 | q += 4749 * d3 + 42 * d2; | |
314 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 315 | |
2359172a GS |
316 | q += 281 * d3; |
317 | buf += 12; | |
318 | if (q) | |
319 | buf = put_dec_trunc8(buf, q); | |
320 | else while (buf[-1] == '0') | |
133fd9f5 DV |
321 | --buf; |
322 | ||
323 | return buf; | |
324 | } | |
325 | ||
326 | #endif | |
327 | ||
1ac101a5 KH |
328 | /* |
329 | * Convert passed number to decimal string. | |
330 | * Returns the length of string. On buffer overflow, returns 0. | |
331 | * | |
332 | * If speed is not important, use snprintf(). It's easy to read the code. | |
333 | */ | |
334 | int num_to_str(char *buf, int size, unsigned long long num) | |
335 | { | |
7c43d9a3 RV |
336 | /* put_dec requires 2-byte alignment of the buffer. */ |
337 | char tmp[sizeof(num) * 3] __aligned(2); | |
1ac101a5 KH |
338 | int idx, len; |
339 | ||
133fd9f5 DV |
340 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
341 | if (num <= 9) { | |
342 | tmp[0] = '0' + num; | |
343 | len = 1; | |
344 | } else { | |
345 | len = put_dec(tmp, num) - tmp; | |
346 | } | |
1ac101a5 KH |
347 | |
348 | if (len > size) | |
349 | return 0; | |
350 | for (idx = 0; idx < len; ++idx) | |
351 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 352 | return len; |
1ac101a5 KH |
353 | } |
354 | ||
51be17df | 355 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 356 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
357 | #define PLUS 4 /* show plus */ |
358 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 359 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
360 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
361 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 362 | |
fef20d9c FW |
363 | enum format_type { |
364 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 365 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
366 | FORMAT_TYPE_PRECISION, |
367 | FORMAT_TYPE_CHAR, | |
368 | FORMAT_TYPE_STR, | |
369 | FORMAT_TYPE_PTR, | |
370 | FORMAT_TYPE_PERCENT_CHAR, | |
371 | FORMAT_TYPE_INVALID, | |
372 | FORMAT_TYPE_LONG_LONG, | |
373 | FORMAT_TYPE_ULONG, | |
374 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
375 | FORMAT_TYPE_UBYTE, |
376 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
377 | FORMAT_TYPE_USHORT, |
378 | FORMAT_TYPE_SHORT, | |
379 | FORMAT_TYPE_UINT, | |
380 | FORMAT_TYPE_INT, | |
fef20d9c FW |
381 | FORMAT_TYPE_SIZE_T, |
382 | FORMAT_TYPE_PTRDIFF | |
383 | }; | |
384 | ||
385 | struct printf_spec { | |
4e310fda | 386 | u8 type; /* format_type enum */ |
ef0658f3 | 387 | u8 flags; /* flags to number() */ |
4e310fda JP |
388 | u8 base; /* number base, 8, 10 or 16 only */ |
389 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
390 | s16 field_width; /* width of output field */ | |
391 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
392 | }; |
393 | ||
cf3b429b JP |
394 | static noinline_for_stack |
395 | char *number(char *buf, char *end, unsigned long long num, | |
396 | struct printf_spec spec) | |
1da177e4 | 397 | { |
7c43d9a3 RV |
398 | /* put_dec requires 2-byte alignment of the buffer. */ |
399 | char tmp[3 * sizeof(num)] __aligned(2); | |
9b706aee DV |
400 | char sign; |
401 | char locase; | |
fef20d9c | 402 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 403 | int i; |
7c203422 | 404 | bool is_zero = num == 0LL; |
1da177e4 | 405 | |
9b706aee DV |
406 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
407 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
408 | locase = (spec.flags & SMALL); |
409 | if (spec.flags & LEFT) | |
410 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 411 | sign = 0; |
fef20d9c | 412 | if (spec.flags & SIGN) { |
7b9186f5 | 413 | if ((signed long long)num < 0) { |
1da177e4 | 414 | sign = '-'; |
7b9186f5 | 415 | num = -(signed long long)num; |
fef20d9c FW |
416 | spec.field_width--; |
417 | } else if (spec.flags & PLUS) { | |
1da177e4 | 418 | sign = '+'; |
fef20d9c FW |
419 | spec.field_width--; |
420 | } else if (spec.flags & SPACE) { | |
1da177e4 | 421 | sign = ' '; |
fef20d9c | 422 | spec.field_width--; |
1da177e4 LT |
423 | } |
424 | } | |
b39a7340 | 425 | if (need_pfx) { |
fef20d9c | 426 | if (spec.base == 16) |
7c203422 PC |
427 | spec.field_width -= 2; |
428 | else if (!is_zero) | |
fef20d9c | 429 | spec.field_width--; |
1da177e4 | 430 | } |
b39a7340 DV |
431 | |
432 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 433 | i = 0; |
133fd9f5 | 434 | if (num < spec.base) |
3ea8d440 | 435 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
436 | else if (spec.base != 10) { /* 8 or 16 */ |
437 | int mask = spec.base - 1; | |
b39a7340 | 438 | int shift = 3; |
7b9186f5 AGR |
439 | |
440 | if (spec.base == 16) | |
441 | shift = 4; | |
b39a7340 | 442 | do { |
3ea8d440 | 443 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
444 | num >>= shift; |
445 | } while (num); | |
4277eedd DV |
446 | } else { /* base 10 */ |
447 | i = put_dec(tmp, num) - tmp; | |
448 | } | |
b39a7340 DV |
449 | |
450 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
451 | if (i > spec.precision) |
452 | spec.precision = i; | |
b39a7340 | 453 | /* leading space padding */ |
fef20d9c | 454 | spec.field_width -= spec.precision; |
51be17df | 455 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
7b9186f5 | 456 | while (--spec.field_width >= 0) { |
f796937a | 457 | if (buf < end) |
1da177e4 LT |
458 | *buf = ' '; |
459 | ++buf; | |
460 | } | |
461 | } | |
b39a7340 | 462 | /* sign */ |
1da177e4 | 463 | if (sign) { |
f796937a | 464 | if (buf < end) |
1da177e4 LT |
465 | *buf = sign; |
466 | ++buf; | |
467 | } | |
b39a7340 DV |
468 | /* "0x" / "0" prefix */ |
469 | if (need_pfx) { | |
7c203422 PC |
470 | if (spec.base == 16 || !is_zero) { |
471 | if (buf < end) | |
472 | *buf = '0'; | |
473 | ++buf; | |
474 | } | |
fef20d9c | 475 | if (spec.base == 16) { |
f796937a | 476 | if (buf < end) |
9b706aee | 477 | *buf = ('X' | locase); |
1da177e4 LT |
478 | ++buf; |
479 | } | |
480 | } | |
b39a7340 | 481 | /* zero or space padding */ |
fef20d9c | 482 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
483 | char c = ' ' + (spec.flags & ZEROPAD); |
484 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
fef20d9c | 485 | while (--spec.field_width >= 0) { |
f796937a | 486 | if (buf < end) |
1da177e4 LT |
487 | *buf = c; |
488 | ++buf; | |
489 | } | |
490 | } | |
b39a7340 | 491 | /* hmm even more zero padding? */ |
fef20d9c | 492 | while (i <= --spec.precision) { |
f796937a | 493 | if (buf < end) |
1da177e4 LT |
494 | *buf = '0'; |
495 | ++buf; | |
496 | } | |
b39a7340 DV |
497 | /* actual digits of result */ |
498 | while (--i >= 0) { | |
f796937a | 499 | if (buf < end) |
1da177e4 LT |
500 | *buf = tmp[i]; |
501 | ++buf; | |
502 | } | |
b39a7340 | 503 | /* trailing space padding */ |
fef20d9c | 504 | while (--spec.field_width >= 0) { |
f796937a | 505 | if (buf < end) |
1da177e4 LT |
506 | *buf = ' '; |
507 | ++buf; | |
508 | } | |
7b9186f5 | 509 | |
1da177e4 LT |
510 | return buf; |
511 | } | |
512 | ||
cf3b429b JP |
513 | static noinline_for_stack |
514 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
515 | { |
516 | int len, i; | |
517 | ||
518 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 519 | s = "(null)"; |
0f9bfa56 | 520 | |
fef20d9c | 521 | len = strnlen(s, spec.precision); |
0f9bfa56 | 522 | |
fef20d9c FW |
523 | if (!(spec.flags & LEFT)) { |
524 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
525 | if (buf < end) |
526 | *buf = ' '; | |
527 | ++buf; | |
528 | } | |
529 | } | |
530 | for (i = 0; i < len; ++i) { | |
531 | if (buf < end) | |
532 | *buf = *s; | |
533 | ++buf; ++s; | |
534 | } | |
fef20d9c | 535 | while (len < spec.field_width--) { |
0f9bfa56 LT |
536 | if (buf < end) |
537 | *buf = ' '; | |
538 | ++buf; | |
539 | } | |
7b9186f5 | 540 | |
0f9bfa56 LT |
541 | return buf; |
542 | } | |
543 | ||
4b6ccca7 AV |
544 | static void widen(char *buf, char *end, unsigned len, unsigned spaces) |
545 | { | |
546 | size_t size; | |
547 | if (buf >= end) /* nowhere to put anything */ | |
548 | return; | |
549 | size = end - buf; | |
550 | if (size <= spaces) { | |
551 | memset(buf, ' ', size); | |
552 | return; | |
553 | } | |
554 | if (len) { | |
555 | if (len > size - spaces) | |
556 | len = size - spaces; | |
557 | memmove(buf + spaces, buf, len); | |
558 | } | |
559 | memset(buf, ' ', spaces); | |
560 | } | |
561 | ||
562 | static noinline_for_stack | |
563 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
564 | const char *fmt) | |
565 | { | |
566 | const char *array[4], *s; | |
567 | const struct dentry *p; | |
568 | int depth; | |
569 | int i, n; | |
570 | ||
571 | switch (fmt[1]) { | |
572 | case '2': case '3': case '4': | |
573 | depth = fmt[1] - '0'; | |
574 | break; | |
575 | default: | |
576 | depth = 1; | |
577 | } | |
578 | ||
579 | rcu_read_lock(); | |
580 | for (i = 0; i < depth; i++, d = p) { | |
581 | p = ACCESS_ONCE(d->d_parent); | |
582 | array[i] = ACCESS_ONCE(d->d_name.name); | |
583 | if (p == d) { | |
584 | if (i) | |
585 | array[i] = ""; | |
586 | i++; | |
587 | break; | |
588 | } | |
589 | } | |
590 | s = array[--i]; | |
591 | for (n = 0; n != spec.precision; n++, buf++) { | |
592 | char c = *s++; | |
593 | if (!c) { | |
594 | if (!i) | |
595 | break; | |
596 | c = '/'; | |
597 | s = array[--i]; | |
598 | } | |
599 | if (buf < end) | |
600 | *buf = c; | |
601 | } | |
602 | rcu_read_unlock(); | |
603 | if (n < spec.field_width) { | |
604 | /* we want to pad the sucker */ | |
605 | unsigned spaces = spec.field_width - n; | |
606 | if (!(spec.flags & LEFT)) { | |
607 | widen(buf - n, end, n, spaces); | |
608 | return buf + spaces; | |
609 | } | |
610 | while (spaces--) { | |
611 | if (buf < end) | |
612 | *buf = ' '; | |
613 | ++buf; | |
614 | } | |
615 | } | |
616 | return buf; | |
617 | } | |
618 | ||
1031bc58 DM |
619 | #ifdef CONFIG_BLOCK |
620 | static noinline_for_stack | |
621 | char *bdev_name(char *buf, char *end, struct block_device *bdev, | |
622 | struct printf_spec spec, const char *fmt) | |
623 | { | |
624 | struct gendisk *hd = bdev->bd_disk; | |
625 | ||
626 | buf = string(buf, end, hd->disk_name, spec); | |
627 | if (bdev->bd_part->partno) { | |
628 | if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { | |
629 | if (buf < end) | |
630 | *buf = 'p'; | |
631 | buf++; | |
632 | } | |
633 | buf = number(buf, end, bdev->bd_part->partno, spec); | |
634 | } | |
635 | return buf; | |
636 | } | |
637 | #endif | |
638 | ||
cf3b429b JP |
639 | static noinline_for_stack |
640 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 641 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 642 | { |
b0d33c2b | 643 | unsigned long value; |
0fe1ef24 LT |
644 | #ifdef CONFIG_KALLSYMS |
645 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
646 | #endif |
647 | ||
648 | if (fmt[1] == 'R') | |
649 | ptr = __builtin_extract_return_addr(ptr); | |
650 | value = (unsigned long)ptr; | |
651 | ||
652 | #ifdef CONFIG_KALLSYMS | |
653 | if (*fmt == 'B') | |
0f77a8d3 | 654 | sprint_backtrace(sym, value); |
b0d33c2b | 655 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
656 | sprint_symbol(sym, value); |
657 | else | |
4796dd20 | 658 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 659 | |
fef20d9c | 660 | return string(buf, end, sym, spec); |
0fe1ef24 | 661 | #else |
7b9186f5 | 662 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
663 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
664 | spec.base = 16; | |
7b9186f5 | 665 | |
fef20d9c | 666 | return number(buf, end, value, spec); |
0fe1ef24 LT |
667 | #endif |
668 | } | |
669 | ||
cf3b429b JP |
670 | static noinline_for_stack |
671 | char *resource_string(char *buf, char *end, struct resource *res, | |
672 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
673 | { |
674 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 675 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
676 | #endif |
677 | ||
678 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 679 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 680 | #endif |
4da0b66c | 681 | static const struct printf_spec io_spec = { |
fef20d9c | 682 | .base = 16, |
4da0b66c | 683 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
684 | .precision = -1, |
685 | .flags = SPECIAL | SMALL | ZEROPAD, | |
686 | }; | |
4da0b66c BH |
687 | static const struct printf_spec mem_spec = { |
688 | .base = 16, | |
689 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
690 | .precision = -1, | |
691 | .flags = SPECIAL | SMALL | ZEROPAD, | |
692 | }; | |
0f4050c7 BH |
693 | static const struct printf_spec bus_spec = { |
694 | .base = 16, | |
695 | .field_width = 2, | |
696 | .precision = -1, | |
697 | .flags = SMALL | ZEROPAD, | |
698 | }; | |
4da0b66c | 699 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
700 | .base = 10, |
701 | .precision = -1, | |
702 | .flags = 0, | |
703 | }; | |
4da0b66c | 704 | static const struct printf_spec str_spec = { |
fd95541e BH |
705 | .field_width = -1, |
706 | .precision = 10, | |
707 | .flags = LEFT, | |
708 | }; | |
4da0b66c | 709 | static const struct printf_spec flag_spec = { |
fd95541e BH |
710 | .base = 16, |
711 | .precision = -1, | |
712 | .flags = SPECIAL | SMALL, | |
713 | }; | |
c7dabef8 BH |
714 | |
715 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
716 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
717 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
718 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 719 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
720 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
721 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
722 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
723 | ||
332d2e78 | 724 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 725 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 726 | const struct printf_spec *specp; |
332d2e78 LT |
727 | |
728 | *p++ = '['; | |
4da0b66c | 729 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 730 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
731 | specp = &io_spec; |
732 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 733 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
734 | specp = &mem_spec; |
735 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 736 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
737 | specp = &dec_spec; |
738 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 739 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 740 | specp = &dec_spec; |
0f4050c7 BH |
741 | } else if (res->flags & IORESOURCE_BUS) { |
742 | p = string(p, pend, "bus ", str_spec); | |
743 | specp = &bus_spec; | |
4da0b66c | 744 | } else { |
c7dabef8 | 745 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 746 | specp = &mem_spec; |
c7dabef8 | 747 | decode = 0; |
fd95541e | 748 | } |
d19cb803 BH |
749 | if (decode && res->flags & IORESOURCE_UNSET) { |
750 | p = string(p, pend, "size ", str_spec); | |
751 | p = number(p, pend, resource_size(res), *specp); | |
752 | } else { | |
753 | p = number(p, pend, res->start, *specp); | |
754 | if (res->start != res->end) { | |
755 | *p++ = '-'; | |
756 | p = number(p, pend, res->end, *specp); | |
757 | } | |
c91d3376 | 758 | } |
c7dabef8 | 759 | if (decode) { |
fd95541e BH |
760 | if (res->flags & IORESOURCE_MEM_64) |
761 | p = string(p, pend, " 64bit", str_spec); | |
762 | if (res->flags & IORESOURCE_PREFETCH) | |
763 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
764 | if (res->flags & IORESOURCE_WINDOW) |
765 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
766 | if (res->flags & IORESOURCE_DISABLED) |
767 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
768 | } else { |
769 | p = string(p, pend, " flags ", str_spec); | |
770 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 771 | } |
332d2e78 | 772 | *p++ = ']'; |
c7dabef8 | 773 | *p = '\0'; |
332d2e78 | 774 | |
fef20d9c | 775 | return string(buf, end, sym, spec); |
332d2e78 LT |
776 | } |
777 | ||
31550a16 AS |
778 | static noinline_for_stack |
779 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
780 | const char *fmt) | |
781 | { | |
360603a1 | 782 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
783 | negative value, fallback to the default */ |
784 | char separator; | |
785 | ||
786 | if (spec.field_width == 0) | |
787 | /* nothing to print */ | |
788 | return buf; | |
789 | ||
790 | if (ZERO_OR_NULL_PTR(addr)) | |
791 | /* NULL pointer */ | |
792 | return string(buf, end, NULL, spec); | |
793 | ||
794 | switch (fmt[1]) { | |
795 | case 'C': | |
796 | separator = ':'; | |
797 | break; | |
798 | case 'D': | |
799 | separator = '-'; | |
800 | break; | |
801 | case 'N': | |
802 | separator = 0; | |
803 | break; | |
804 | default: | |
805 | separator = ' '; | |
806 | break; | |
807 | } | |
808 | ||
809 | if (spec.field_width > 0) | |
810 | len = min_t(int, spec.field_width, 64); | |
811 | ||
9c98f235 RV |
812 | for (i = 0; i < len; ++i) { |
813 | if (buf < end) | |
814 | *buf = hex_asc_hi(addr[i]); | |
815 | ++buf; | |
816 | if (buf < end) | |
817 | *buf = hex_asc_lo(addr[i]); | |
818 | ++buf; | |
31550a16 | 819 | |
9c98f235 RV |
820 | if (separator && i != len - 1) { |
821 | if (buf < end) | |
822 | *buf = separator; | |
823 | ++buf; | |
824 | } | |
31550a16 AS |
825 | } |
826 | ||
827 | return buf; | |
828 | } | |
829 | ||
dbc760bc TH |
830 | static noinline_for_stack |
831 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
832 | struct printf_spec spec, const char *fmt) | |
833 | { | |
834 | const int CHUNKSZ = 32; | |
835 | int nr_bits = max_t(int, spec.field_width, 0); | |
836 | int i, chunksz; | |
837 | bool first = true; | |
838 | ||
839 | /* reused to print numbers */ | |
840 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
841 | ||
842 | chunksz = nr_bits & (CHUNKSZ - 1); | |
843 | if (chunksz == 0) | |
844 | chunksz = CHUNKSZ; | |
845 | ||
846 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
847 | for (; i >= 0; i -= CHUNKSZ) { | |
848 | u32 chunkmask, val; | |
849 | int word, bit; | |
850 | ||
851 | chunkmask = ((1ULL << chunksz) - 1); | |
852 | word = i / BITS_PER_LONG; | |
853 | bit = i % BITS_PER_LONG; | |
854 | val = (bitmap[word] >> bit) & chunkmask; | |
855 | ||
856 | if (!first) { | |
857 | if (buf < end) | |
858 | *buf = ','; | |
859 | buf++; | |
860 | } | |
861 | first = false; | |
862 | ||
863 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
864 | buf = number(buf, end, val, spec); | |
865 | ||
866 | chunksz = CHUNKSZ; | |
867 | } | |
868 | return buf; | |
869 | } | |
870 | ||
871 | static noinline_for_stack | |
872 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
873 | struct printf_spec spec, const char *fmt) | |
874 | { | |
875 | int nr_bits = max_t(int, spec.field_width, 0); | |
876 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
877 | int cur, rbot, rtop; | |
878 | bool first = true; | |
879 | ||
880 | /* reused to print numbers */ | |
881 | spec = (struct printf_spec){ .base = 10 }; | |
882 | ||
883 | rbot = cur = find_first_bit(bitmap, nr_bits); | |
884 | while (cur < nr_bits) { | |
885 | rtop = cur; | |
886 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
887 | if (cur < nr_bits && cur <= rtop + 1) | |
888 | continue; | |
889 | ||
890 | if (!first) { | |
891 | if (buf < end) | |
892 | *buf = ','; | |
893 | buf++; | |
894 | } | |
895 | first = false; | |
896 | ||
897 | buf = number(buf, end, rbot, spec); | |
898 | if (rbot < rtop) { | |
899 | if (buf < end) | |
900 | *buf = '-'; | |
901 | buf++; | |
902 | ||
903 | buf = number(buf, end, rtop, spec); | |
904 | } | |
905 | ||
906 | rbot = cur; | |
907 | } | |
908 | return buf; | |
909 | } | |
910 | ||
cf3b429b JP |
911 | static noinline_for_stack |
912 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
913 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 914 | { |
8a27f7c9 | 915 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
916 | char *p = mac_addr; |
917 | int i; | |
bc7259a2 | 918 | char separator; |
76597ff9 | 919 | bool reversed = false; |
bc7259a2 | 920 | |
76597ff9 AE |
921 | switch (fmt[1]) { |
922 | case 'F': | |
bc7259a2 | 923 | separator = '-'; |
76597ff9 AE |
924 | break; |
925 | ||
926 | case 'R': | |
927 | reversed = true; | |
928 | /* fall through */ | |
929 | ||
930 | default: | |
bc7259a2 | 931 | separator = ':'; |
76597ff9 | 932 | break; |
bc7259a2 | 933 | } |
dd45c9cf HH |
934 | |
935 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
936 | if (reversed) |
937 | p = hex_byte_pack(p, addr[5 - i]); | |
938 | else | |
939 | p = hex_byte_pack(p, addr[i]); | |
940 | ||
8a27f7c9 | 941 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 942 | *p++ = separator; |
dd45c9cf HH |
943 | } |
944 | *p = '\0'; | |
945 | ||
fef20d9c | 946 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
947 | } |
948 | ||
cf3b429b JP |
949 | static noinline_for_stack |
950 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
951 | { |
952 | int i; | |
0159f24e JP |
953 | bool leading_zeros = (fmt[0] == 'i'); |
954 | int index; | |
955 | int step; | |
956 | ||
957 | switch (fmt[2]) { | |
958 | case 'h': | |
959 | #ifdef __BIG_ENDIAN | |
960 | index = 0; | |
961 | step = 1; | |
962 | #else | |
963 | index = 3; | |
964 | step = -1; | |
965 | #endif | |
966 | break; | |
967 | case 'l': | |
968 | index = 3; | |
969 | step = -1; | |
970 | break; | |
971 | case 'n': | |
972 | case 'b': | |
973 | default: | |
974 | index = 0; | |
975 | step = 1; | |
976 | break; | |
977 | } | |
8a27f7c9 | 978 | for (i = 0; i < 4; i++) { |
7c43d9a3 | 979 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ |
133fd9f5 | 980 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
981 | if (leading_zeros) { |
982 | if (digits < 3) | |
983 | *p++ = '0'; | |
984 | if (digits < 2) | |
985 | *p++ = '0'; | |
986 | } | |
987 | /* reverse the digits in the quad */ | |
988 | while (digits--) | |
989 | *p++ = temp[digits]; | |
990 | if (i < 3) | |
991 | *p++ = '.'; | |
0159f24e | 992 | index += step; |
8a27f7c9 | 993 | } |
8a27f7c9 | 994 | *p = '\0'; |
7b9186f5 | 995 | |
8a27f7c9 JP |
996 | return p; |
997 | } | |
998 | ||
cf3b429b JP |
999 | static noinline_for_stack |
1000 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 1001 | { |
7b9186f5 | 1002 | int i, j, range; |
8a27f7c9 JP |
1003 | unsigned char zerolength[8]; |
1004 | int longest = 1; | |
1005 | int colonpos = -1; | |
1006 | u16 word; | |
7b9186f5 | 1007 | u8 hi, lo; |
8a27f7c9 | 1008 | bool needcolon = false; |
eb78cd26 JP |
1009 | bool useIPv4; |
1010 | struct in6_addr in6; | |
1011 | ||
1012 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
1013 | ||
1014 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
1015 | |
1016 | memset(zerolength, 0, sizeof(zerolength)); | |
1017 | ||
1018 | if (useIPv4) | |
1019 | range = 6; | |
1020 | else | |
1021 | range = 8; | |
1022 | ||
1023 | /* find position of longest 0 run */ | |
1024 | for (i = 0; i < range; i++) { | |
1025 | for (j = i; j < range; j++) { | |
eb78cd26 | 1026 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
1027 | break; |
1028 | zerolength[i]++; | |
1029 | } | |
1030 | } | |
1031 | for (i = 0; i < range; i++) { | |
1032 | if (zerolength[i] > longest) { | |
1033 | longest = zerolength[i]; | |
1034 | colonpos = i; | |
1035 | } | |
1036 | } | |
29cf519e JP |
1037 | if (longest == 1) /* don't compress a single 0 */ |
1038 | colonpos = -1; | |
689afa7d | 1039 | |
8a27f7c9 JP |
1040 | /* emit address */ |
1041 | for (i = 0; i < range; i++) { | |
1042 | if (i == colonpos) { | |
1043 | if (needcolon || i == 0) | |
1044 | *p++ = ':'; | |
1045 | *p++ = ':'; | |
1046 | needcolon = false; | |
1047 | i += longest - 1; | |
1048 | continue; | |
1049 | } | |
1050 | if (needcolon) { | |
1051 | *p++ = ':'; | |
1052 | needcolon = false; | |
1053 | } | |
1054 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1055 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1056 | hi = word >> 8; |
1057 | lo = word & 0xff; | |
1058 | if (hi) { | |
1059 | if (hi > 0x0f) | |
55036ba7 | 1060 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1061 | else |
1062 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1063 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1064 | } |
b5ff992b | 1065 | else if (lo > 0x0f) |
55036ba7 | 1066 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1067 | else |
1068 | *p++ = hex_asc_lo(lo); | |
1069 | needcolon = true; | |
1070 | } | |
1071 | ||
1072 | if (useIPv4) { | |
1073 | if (needcolon) | |
1074 | *p++ = ':'; | |
0159f24e | 1075 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1076 | } |
8a27f7c9 | 1077 | *p = '\0'; |
7b9186f5 | 1078 | |
8a27f7c9 JP |
1079 | return p; |
1080 | } | |
1081 | ||
cf3b429b JP |
1082 | static noinline_for_stack |
1083 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1084 | { |
1085 | int i; | |
7b9186f5 | 1086 | |
689afa7d | 1087 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1088 | p = hex_byte_pack(p, *addr++); |
1089 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1090 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1091 | *p++ = ':'; |
1092 | } | |
1093 | *p = '\0'; | |
7b9186f5 | 1094 | |
8a27f7c9 JP |
1095 | return p; |
1096 | } | |
1097 | ||
cf3b429b JP |
1098 | static noinline_for_stack |
1099 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1100 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1101 | { |
1102 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1103 | ||
1104 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1105 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1106 | else |
eb78cd26 | 1107 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1108 | |
fef20d9c | 1109 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
1110 | } |
1111 | ||
cf3b429b JP |
1112 | static noinline_for_stack |
1113 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1114 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1115 | { |
8a27f7c9 | 1116 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1117 | |
0159f24e | 1118 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1119 | |
fef20d9c | 1120 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
1121 | } |
1122 | ||
10679643 DB |
1123 | static noinline_for_stack |
1124 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1125 | struct printf_spec spec, const char *fmt) | |
1126 | { | |
1127 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1128 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1129 | sizeof(":12345") + sizeof("/123456789") + | |
1130 | sizeof("%1234567890")]; | |
1131 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1132 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1133 | char fmt6[2] = { fmt[0], '6' }; | |
1134 | u8 off = 0; | |
1135 | ||
1136 | fmt++; | |
1137 | while (isalpha(*++fmt)) { | |
1138 | switch (*fmt) { | |
1139 | case 'p': | |
1140 | have_p = true; | |
1141 | break; | |
1142 | case 'f': | |
1143 | have_f = true; | |
1144 | break; | |
1145 | case 's': | |
1146 | have_s = true; | |
1147 | break; | |
1148 | case 'c': | |
1149 | have_c = true; | |
1150 | break; | |
1151 | } | |
1152 | } | |
1153 | ||
1154 | if (have_p || have_s || have_f) { | |
1155 | *p = '['; | |
1156 | off = 1; | |
1157 | } | |
1158 | ||
1159 | if (fmt6[0] == 'I' && have_c) | |
1160 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1161 | else | |
1162 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1163 | ||
1164 | if (have_p || have_s || have_f) | |
1165 | *p++ = ']'; | |
1166 | ||
1167 | if (have_p) { | |
1168 | *p++ = ':'; | |
1169 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1170 | } | |
1171 | if (have_f) { | |
1172 | *p++ = '/'; | |
1173 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1174 | IPV6_FLOWINFO_MASK), spec); | |
1175 | } | |
1176 | if (have_s) { | |
1177 | *p++ = '%'; | |
1178 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1179 | } | |
1180 | *p = '\0'; | |
1181 | ||
1182 | return string(buf, end, ip6_addr, spec); | |
1183 | } | |
1184 | ||
1185 | static noinline_for_stack | |
1186 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1187 | struct printf_spec spec, const char *fmt) | |
1188 | { | |
1189 | bool have_p = false; | |
1190 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1191 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1192 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1193 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1194 | ||
1195 | fmt++; | |
1196 | while (isalpha(*++fmt)) { | |
1197 | switch (*fmt) { | |
1198 | case 'p': | |
1199 | have_p = true; | |
1200 | break; | |
1201 | case 'h': | |
1202 | case 'l': | |
1203 | case 'n': | |
1204 | case 'b': | |
1205 | fmt4[2] = *fmt; | |
1206 | break; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | p = ip4_string(ip4_addr, addr, fmt4); | |
1211 | if (have_p) { | |
1212 | *p++ = ':'; | |
1213 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1214 | } | |
1215 | *p = '\0'; | |
1216 | ||
1217 | return string(buf, end, ip4_addr, spec); | |
1218 | } | |
1219 | ||
71dca95d AS |
1220 | static noinline_for_stack |
1221 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1222 | const char *fmt) | |
1223 | { | |
1224 | bool found = true; | |
1225 | int count = 1; | |
1226 | unsigned int flags = 0; | |
1227 | int len; | |
1228 | ||
1229 | if (spec.field_width == 0) | |
1230 | return buf; /* nothing to print */ | |
1231 | ||
1232 | if (ZERO_OR_NULL_PTR(addr)) | |
1233 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1234 | ||
1235 | ||
1236 | do { | |
1237 | switch (fmt[count++]) { | |
1238 | case 'a': | |
1239 | flags |= ESCAPE_ANY; | |
1240 | break; | |
1241 | case 'c': | |
1242 | flags |= ESCAPE_SPECIAL; | |
1243 | break; | |
1244 | case 'h': | |
1245 | flags |= ESCAPE_HEX; | |
1246 | break; | |
1247 | case 'n': | |
1248 | flags |= ESCAPE_NULL; | |
1249 | break; | |
1250 | case 'o': | |
1251 | flags |= ESCAPE_OCTAL; | |
1252 | break; | |
1253 | case 'p': | |
1254 | flags |= ESCAPE_NP; | |
1255 | break; | |
1256 | case 's': | |
1257 | flags |= ESCAPE_SPACE; | |
1258 | break; | |
1259 | default: | |
1260 | found = false; | |
1261 | break; | |
1262 | } | |
1263 | } while (found); | |
1264 | ||
1265 | if (!flags) | |
1266 | flags = ESCAPE_ANY_NP; | |
1267 | ||
1268 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1269 | ||
41416f23 RV |
1270 | /* |
1271 | * string_escape_mem() writes as many characters as it can to | |
1272 | * the given buffer, and returns the total size of the output | |
1273 | * had the buffer been big enough. | |
1274 | */ | |
1275 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
71dca95d AS |
1276 | |
1277 | return buf; | |
1278 | } | |
1279 | ||
cf3b429b JP |
1280 | static noinline_for_stack |
1281 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1282 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
1283 | { |
1284 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1285 | char *p = uuid; | |
1286 | int i; | |
1287 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1288 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1289 | const u8 *index = be; | |
1290 | bool uc = false; | |
1291 | ||
1292 | switch (*(++fmt)) { | |
1293 | case 'L': | |
1294 | uc = true; /* fall-through */ | |
1295 | case 'l': | |
1296 | index = le; | |
1297 | break; | |
1298 | case 'B': | |
1299 | uc = true; | |
1300 | break; | |
1301 | } | |
1302 | ||
1303 | for (i = 0; i < 16; i++) { | |
55036ba7 | 1304 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
1305 | switch (i) { |
1306 | case 3: | |
1307 | case 5: | |
1308 | case 7: | |
1309 | case 9: | |
1310 | *p++ = '-'; | |
1311 | break; | |
1312 | } | |
1313 | } | |
1314 | ||
1315 | *p = 0; | |
1316 | ||
1317 | if (uc) { | |
1318 | p = uuid; | |
1319 | do { | |
1320 | *p = toupper(*p); | |
1321 | } while (*(++p)); | |
1322 | } | |
1323 | ||
1324 | return string(buf, end, uuid, spec); | |
1325 | } | |
1326 | ||
c8f44aff MM |
1327 | static |
1328 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1329 | struct printf_spec spec) | |
1330 | { | |
1331 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1332 | if (spec.field_width == -1) | |
1333 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1334 | spec.base = 16; | |
1335 | ||
1336 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1337 | } | |
1338 | ||
aaf07621 JP |
1339 | static noinline_for_stack |
1340 | char *address_val(char *buf, char *end, const void *addr, | |
1341 | struct printf_spec spec, const char *fmt) | |
1342 | { | |
1343 | unsigned long long num; | |
1344 | ||
1345 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1346 | spec.base = 16; | |
1347 | ||
1348 | switch (fmt[1]) { | |
1349 | case 'd': | |
1350 | num = *(const dma_addr_t *)addr; | |
1351 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; | |
1352 | break; | |
1353 | case 'p': | |
1354 | default: | |
1355 | num = *(const phys_addr_t *)addr; | |
1356 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1357 | break; | |
1358 | } | |
1359 | ||
1360 | return number(buf, end, num, spec); | |
1361 | } | |
1362 | ||
900cca29 GU |
1363 | static noinline_for_stack |
1364 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1365 | const char *fmt) | |
1366 | { | |
1367 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk) | |
1368 | return string(buf, end, NULL, spec); | |
1369 | ||
1370 | switch (fmt[1]) { | |
1371 | case 'r': | |
1372 | return number(buf, end, clk_get_rate(clk), spec); | |
1373 | ||
1374 | case 'n': | |
1375 | default: | |
1376 | #ifdef CONFIG_COMMON_CLK | |
1377 | return string(buf, end, __clk_get_name(clk), spec); | |
1378 | #else | |
1379 | spec.base = 16; | |
1380 | spec.field_width = sizeof(unsigned long) * 2 + 2; | |
1381 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1382 | return number(buf, end, (unsigned long)clk, spec); | |
1383 | #endif | |
1384 | } | |
1385 | } | |
1386 | ||
411f05f1 | 1387 | int kptr_restrict __read_mostly; |
455cd5ab | 1388 | |
4d8a743c LT |
1389 | /* |
1390 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1391 | * by an extra set of alphanumeric characters that are extended format | |
1392 | * specifiers. | |
1393 | * | |
332d2e78 LT |
1394 | * Right now we handle: |
1395 | * | |
0c8b946e FW |
1396 | * - 'F' For symbolic function descriptor pointers with offset |
1397 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
1398 | * - 'S' For symbolic direct pointers with offset |
1399 | * - 's' For symbolic direct pointers without offset | |
b0d33c2b | 1400 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1401 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1402 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1403 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
1404 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
1405 | * width which must be explicitly specified either as part of the | |
1406 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1407 | * range-list format instead of hex format | |
dd45c9cf HH |
1408 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1409 | * usual colon-separated hex notation | |
8a27f7c9 | 1410 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1411 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1412 | * with a dash-separated hex notation |
7c59154e | 1413 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1414 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1415 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1416 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1417 | * [S][pfs] |
1418 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1419 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1420 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1421 | * IPv6 omits the colons (01020304...0f) | |
1422 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1423 | * [S][pfs] |
1424 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1425 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1426 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1427 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1428 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
1429 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
1430 | * of the following flags (see string_escape_mem() for the | |
1431 | * details): | |
1432 | * a - ESCAPE_ANY | |
1433 | * c - ESCAPE_SPECIAL | |
1434 | * h - ESCAPE_HEX | |
1435 | * n - ESCAPE_NULL | |
1436 | * o - ESCAPE_OCTAL | |
1437 | * p - ESCAPE_NP | |
1438 | * s - ESCAPE_SPACE | |
1439 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
1440 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1441 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1442 | * Options for %pU are: | |
1443 | * b big endian lower case hex (default) | |
1444 | * B big endian UPPER case hex | |
1445 | * l little endian lower case hex | |
1446 | * L little endian UPPER case hex | |
1447 | * big endian output byte order is: | |
1448 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1449 | * little endian output byte order is: | |
1450 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1451 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1452 | * call vsnprintf(->format, *->va_list). | |
1453 | * Implements a "recursive vsnprintf". | |
1454 | * Do not use this feature without some mechanism to verify the | |
1455 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1456 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1457 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1458 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1459 | * a certain separator (' ' by default): | |
1460 | * C colon | |
1461 | * D dash | |
1462 | * N no separator | |
1463 | * The maximum supported length is 64 bytes of the input. Consider | |
1464 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
1465 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1466 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
1467 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1468 | * - 'D[234]' Same as 'd' but for a struct file | |
1031bc58 | 1469 | * - 'g' For block_device name (gendisk + partition number) |
900cca29 GU |
1470 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
1471 | * (legacy clock framework) of the clock | |
1472 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
1473 | * (legacy clock framework) of the clock | |
1474 | * - 'Cr' For a clock, it prints the current rate of the clock | |
5e4ee7b1 MK |
1475 | * |
1476 | * ** Please update also Documentation/printk-formats.txt when making changes ** | |
9ac6e44e | 1477 | * |
332d2e78 LT |
1478 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1479 | * function pointers are really function descriptors, which contain a | |
1480 | * pointer to the real address. | |
4d8a743c | 1481 | */ |
cf3b429b JP |
1482 | static noinline_for_stack |
1483 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1484 | struct printf_spec spec) | |
78a8bf69 | 1485 | { |
80c9eb46 | 1486 | const int default_width = 2 * sizeof(void *); |
725fe002 | 1487 | |
9f36e2c4 | 1488 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1489 | /* |
1490 | * Print (null) with the same width as a pointer so it makes | |
1491 | * tabular output look nice. | |
1492 | */ | |
1493 | if (spec.field_width == -1) | |
725fe002 | 1494 | spec.field_width = default_width; |
fef20d9c | 1495 | return string(buf, end, "(null)", spec); |
5e057981 | 1496 | } |
d97106ab | 1497 | |
0fe1ef24 LT |
1498 | switch (*fmt) { |
1499 | case 'F': | |
0c8b946e | 1500 | case 'f': |
0fe1ef24 LT |
1501 | ptr = dereference_function_descriptor(ptr); |
1502 | /* Fallthrough */ | |
1503 | case 'S': | |
9ac6e44e | 1504 | case 's': |
0f77a8d3 | 1505 | case 'B': |
b0d33c2b | 1506 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1507 | case 'R': |
c7dabef8 | 1508 | case 'r': |
fd95541e | 1509 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1510 | case 'h': |
1511 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
1512 | case 'b': |
1513 | switch (fmt[1]) { | |
1514 | case 'l': | |
1515 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1516 | default: | |
1517 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1518 | } | |
8a27f7c9 JP |
1519 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1520 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1521 | /* [mM]F (FDDI) */ |
1522 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1523 | return mac_address_string(buf, end, ptr, spec, fmt); |
1524 | case 'I': /* Formatted IP supported | |
1525 | * 4: 1.2.3.4 | |
1526 | * 6: 0001:0203:...:0708 | |
1527 | * 6c: 1::708 or 1::1.2.3.4 | |
1528 | */ | |
1529 | case 'i': /* Contiguous: | |
1530 | * 4: 001.002.003.004 | |
1531 | * 6: 000102...0f | |
1532 | */ | |
1533 | switch (fmt[1]) { | |
1534 | case '6': | |
1535 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1536 | case '4': | |
1537 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
1538 | case 'S': { |
1539 | const union { | |
1540 | struct sockaddr raw; | |
1541 | struct sockaddr_in v4; | |
1542 | struct sockaddr_in6 v6; | |
1543 | } *sa = ptr; | |
1544 | ||
1545 | switch (sa->raw.sa_family) { | |
1546 | case AF_INET: | |
1547 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1548 | case AF_INET6: | |
1549 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1550 | default: | |
1551 | return string(buf, end, "(invalid address)", spec); | |
1552 | }} | |
8a27f7c9 | 1553 | } |
fef20d9c | 1554 | break; |
71dca95d AS |
1555 | case 'E': |
1556 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
1557 | case 'U': |
1558 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1559 | case 'V': |
5756b76e JB |
1560 | { |
1561 | va_list va; | |
1562 | ||
1563 | va_copy(va, *((struct va_format *)ptr)->va); | |
1564 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1565 | ((struct va_format *)ptr)->fmt, va); | |
1566 | va_end(va); | |
1567 | return buf; | |
1568 | } | |
455cd5ab DR |
1569 | case 'K': |
1570 | /* | |
1571 | * %pK cannot be used in IRQ context because its test | |
1572 | * for CAP_SYSLOG would be meaningless. | |
1573 | */ | |
3715c530 DR |
1574 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1575 | in_nmi())) { | |
455cd5ab | 1576 | if (spec.field_width == -1) |
725fe002 | 1577 | spec.field_width = default_width; |
455cd5ab | 1578 | return string(buf, end, "pK-error", spec); |
455cd5ab | 1579 | } |
312b4e22 RM |
1580 | |
1581 | switch (kptr_restrict) { | |
1582 | case 0: | |
1583 | /* Always print %pK values */ | |
1584 | break; | |
1585 | case 1: { | |
1586 | /* | |
1587 | * Only print the real pointer value if the current | |
1588 | * process has CAP_SYSLOG and is running with the | |
1589 | * same credentials it started with. This is because | |
1590 | * access to files is checked at open() time, but %pK | |
1591 | * checks permission at read() time. We don't want to | |
1592 | * leak pointer values if a binary opens a file using | |
1593 | * %pK and then elevates privileges before reading it. | |
1594 | */ | |
1595 | const struct cred *cred = current_cred(); | |
1596 | ||
1597 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1598 | !uid_eq(cred->euid, cred->uid) || | |
1599 | !gid_eq(cred->egid, cred->gid)) | |
1600 | ptr = NULL; | |
1601 | break; | |
1602 | } | |
1603 | case 2: | |
1604 | default: | |
1605 | /* Always print 0's for %pK */ | |
26297607 | 1606 | ptr = NULL; |
312b4e22 RM |
1607 | break; |
1608 | } | |
26297607 | 1609 | break; |
312b4e22 | 1610 | |
c8f44aff MM |
1611 | case 'N': |
1612 | switch (fmt[1]) { | |
1613 | case 'F': | |
1614 | return netdev_feature_string(buf, end, ptr, spec); | |
1615 | } | |
1616 | break; | |
7d799210 | 1617 | case 'a': |
aaf07621 | 1618 | return address_val(buf, end, ptr, spec, fmt); |
4b6ccca7 AV |
1619 | case 'd': |
1620 | return dentry_name(buf, end, ptr, spec, fmt); | |
900cca29 GU |
1621 | case 'C': |
1622 | return clock(buf, end, ptr, spec, fmt); | |
4b6ccca7 AV |
1623 | case 'D': |
1624 | return dentry_name(buf, end, | |
1625 | ((const struct file *)ptr)->f_path.dentry, | |
1626 | spec, fmt); | |
1031bc58 DM |
1627 | #ifdef CONFIG_BLOCK |
1628 | case 'g': | |
1629 | return bdev_name(buf, end, ptr, spec, fmt); | |
1630 | #endif | |
1631 | ||
fef20d9c FW |
1632 | } |
1633 | spec.flags |= SMALL; | |
1634 | if (spec.field_width == -1) { | |
725fe002 | 1635 | spec.field_width = default_width; |
fef20d9c FW |
1636 | spec.flags |= ZEROPAD; |
1637 | } | |
1638 | spec.base = 16; | |
1639 | ||
1640 | return number(buf, end, (unsigned long) ptr, spec); | |
1641 | } | |
1642 | ||
1643 | /* | |
1644 | * Helper function to decode printf style format. | |
1645 | * Each call decode a token from the format and return the | |
1646 | * number of characters read (or likely the delta where it wants | |
1647 | * to go on the next call). | |
1648 | * The decoded token is returned through the parameters | |
1649 | * | |
1650 | * 'h', 'l', or 'L' for integer fields | |
1651 | * 'z' support added 23/7/1999 S.H. | |
1652 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1653 | * 't' added for ptrdiff_t | |
1654 | * | |
1655 | * @fmt: the format string | |
1656 | * @type of the token returned | |
1657 | * @flags: various flags such as +, -, # tokens.. | |
1658 | * @field_width: overwritten width | |
1659 | * @base: base of the number (octal, hex, ...) | |
1660 | * @precision: precision of a number | |
1661 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1662 | */ | |
cf3b429b JP |
1663 | static noinline_for_stack |
1664 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1665 | { |
1666 | const char *start = fmt; | |
fef20d9c FW |
1667 | |
1668 | /* we finished early by reading the field width */ | |
ed681a91 | 1669 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1670 | if (spec->field_width < 0) { |
1671 | spec->field_width = -spec->field_width; | |
1672 | spec->flags |= LEFT; | |
1673 | } | |
1674 | spec->type = FORMAT_TYPE_NONE; | |
1675 | goto precision; | |
1676 | } | |
1677 | ||
1678 | /* we finished early by reading the precision */ | |
1679 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1680 | if (spec->precision < 0) | |
1681 | spec->precision = 0; | |
1682 | ||
1683 | spec->type = FORMAT_TYPE_NONE; | |
1684 | goto qualifier; | |
1685 | } | |
1686 | ||
1687 | /* By default */ | |
1688 | spec->type = FORMAT_TYPE_NONE; | |
1689 | ||
1690 | for (; *fmt ; ++fmt) { | |
1691 | if (*fmt == '%') | |
1692 | break; | |
1693 | } | |
1694 | ||
1695 | /* Return the current non-format string */ | |
1696 | if (fmt != start || !*fmt) | |
1697 | return fmt - start; | |
1698 | ||
1699 | /* Process flags */ | |
1700 | spec->flags = 0; | |
1701 | ||
1702 | while (1) { /* this also skips first '%' */ | |
1703 | bool found = true; | |
1704 | ||
1705 | ++fmt; | |
1706 | ||
1707 | switch (*fmt) { | |
1708 | case '-': spec->flags |= LEFT; break; | |
1709 | case '+': spec->flags |= PLUS; break; | |
1710 | case ' ': spec->flags |= SPACE; break; | |
1711 | case '#': spec->flags |= SPECIAL; break; | |
1712 | case '0': spec->flags |= ZEROPAD; break; | |
1713 | default: found = false; | |
1714 | } | |
1715 | ||
1716 | if (!found) | |
1717 | break; | |
1718 | } | |
1719 | ||
1720 | /* get field width */ | |
1721 | spec->field_width = -1; | |
1722 | ||
1723 | if (isdigit(*fmt)) | |
1724 | spec->field_width = skip_atoi(&fmt); | |
1725 | else if (*fmt == '*') { | |
1726 | /* it's the next argument */ | |
ed681a91 | 1727 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1728 | return ++fmt - start; |
1729 | } | |
1730 | ||
1731 | precision: | |
1732 | /* get the precision */ | |
1733 | spec->precision = -1; | |
1734 | if (*fmt == '.') { | |
1735 | ++fmt; | |
1736 | if (isdigit(*fmt)) { | |
1737 | spec->precision = skip_atoi(&fmt); | |
1738 | if (spec->precision < 0) | |
1739 | spec->precision = 0; | |
1740 | } else if (*fmt == '*') { | |
1741 | /* it's the next argument */ | |
adf26f84 | 1742 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1743 | return ++fmt - start; |
1744 | } | |
1745 | } | |
1746 | ||
1747 | qualifier: | |
1748 | /* get the conversion qualifier */ | |
1749 | spec->qualifier = -1; | |
75fb8f26 AS |
1750 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1751 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1752 | spec->qualifier = *fmt++; |
1753 | if (unlikely(spec->qualifier == *fmt)) { | |
1754 | if (spec->qualifier == 'l') { | |
1755 | spec->qualifier = 'L'; | |
1756 | ++fmt; | |
1757 | } else if (spec->qualifier == 'h') { | |
1758 | spec->qualifier = 'H'; | |
1759 | ++fmt; | |
1760 | } | |
fef20d9c FW |
1761 | } |
1762 | } | |
1763 | ||
1764 | /* default base */ | |
1765 | spec->base = 10; | |
1766 | switch (*fmt) { | |
1767 | case 'c': | |
1768 | spec->type = FORMAT_TYPE_CHAR; | |
1769 | return ++fmt - start; | |
1770 | ||
1771 | case 's': | |
1772 | spec->type = FORMAT_TYPE_STR; | |
1773 | return ++fmt - start; | |
1774 | ||
1775 | case 'p': | |
1776 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 1777 | return ++fmt - start; |
fef20d9c | 1778 | |
fef20d9c FW |
1779 | case '%': |
1780 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1781 | return ++fmt - start; | |
1782 | ||
1783 | /* integer number formats - set up the flags and "break" */ | |
1784 | case 'o': | |
1785 | spec->base = 8; | |
1786 | break; | |
1787 | ||
1788 | case 'x': | |
1789 | spec->flags |= SMALL; | |
1790 | ||
1791 | case 'X': | |
1792 | spec->base = 16; | |
1793 | break; | |
1794 | ||
1795 | case 'd': | |
1796 | case 'i': | |
39e874f8 | 1797 | spec->flags |= SIGN; |
fef20d9c | 1798 | case 'u': |
4aa99606 | 1799 | break; |
fef20d9c | 1800 | |
708d96fd RM |
1801 | case 'n': |
1802 | /* | |
b006f19b RV |
1803 | * Since %n poses a greater security risk than |
1804 | * utility, treat it as any other invalid or | |
1805 | * unsupported format specifier. | |
708d96fd | 1806 | */ |
708d96fd RM |
1807 | /* Fall-through */ |
1808 | ||
fef20d9c | 1809 | default: |
b006f19b | 1810 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); |
fef20d9c FW |
1811 | spec->type = FORMAT_TYPE_INVALID; |
1812 | return fmt - start; | |
0fe1ef24 | 1813 | } |
fef20d9c FW |
1814 | |
1815 | if (spec->qualifier == 'L') | |
1816 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1817 | else if (spec->qualifier == 'l') { | |
51be17df RV |
1818 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
1819 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
75fb8f26 | 1820 | } else if (_tolower(spec->qualifier) == 'z') { |
fef20d9c FW |
1821 | spec->type = FORMAT_TYPE_SIZE_T; |
1822 | } else if (spec->qualifier == 't') { | |
1823 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 | 1824 | } else if (spec->qualifier == 'H') { |
51be17df RV |
1825 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
1826 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
fef20d9c | 1827 | } else if (spec->qualifier == 'h') { |
51be17df RV |
1828 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
1829 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 1830 | } else { |
51be17df RV |
1831 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
1832 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 1833 | } |
fef20d9c FW |
1834 | |
1835 | return ++fmt - start; | |
78a8bf69 LT |
1836 | } |
1837 | ||
1da177e4 LT |
1838 | /** |
1839 | * vsnprintf - Format a string and place it in a buffer | |
1840 | * @buf: The buffer to place the result into | |
1841 | * @size: The size of the buffer, including the trailing null space | |
1842 | * @fmt: The format string to use | |
1843 | * @args: Arguments for the format string | |
1844 | * | |
d7ec9a05 RV |
1845 | * This function generally follows C99 vsnprintf, but has some |
1846 | * extensions and a few limitations: | |
1847 | * | |
1848 | * %n is unsupported | |
5e4ee7b1 MK |
1849 | * %p* is handled by pointer() |
1850 | * | |
1851 | * See pointer() or Documentation/printk-formats.txt for more | |
1852 | * extensive description. | |
20036fdc | 1853 | * |
5e4ee7b1 | 1854 | * ** Please update the documentation in both places when making changes ** |
80f548e0 | 1855 | * |
1da177e4 LT |
1856 | * The return value is the number of characters which would |
1857 | * be generated for the given input, excluding the trailing | |
1858 | * '\0', as per ISO C99. If you want to have the exact | |
1859 | * number of characters written into @buf as return value | |
72fd4a35 | 1860 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1861 | * return is greater than or equal to @size, the resulting |
1862 | * string is truncated. | |
1863 | * | |
ba1835eb | 1864 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1865 | */ |
1866 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1867 | { | |
1da177e4 | 1868 | unsigned long long num; |
d4be151b | 1869 | char *str, *end; |
fef20d9c | 1870 | struct printf_spec spec = {0}; |
1da177e4 | 1871 | |
f796937a JF |
1872 | /* Reject out-of-range values early. Large positive sizes are |
1873 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 1874 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 1875 | return 0; |
1da177e4 LT |
1876 | |
1877 | str = buf; | |
f796937a | 1878 | end = buf + size; |
1da177e4 | 1879 | |
f796937a JF |
1880 | /* Make sure end is always >= buf */ |
1881 | if (end < buf) { | |
1882 | end = ((void *)-1); | |
1883 | size = end - buf; | |
1da177e4 LT |
1884 | } |
1885 | ||
fef20d9c FW |
1886 | while (*fmt) { |
1887 | const char *old_fmt = fmt; | |
d4be151b | 1888 | int read = format_decode(fmt, &spec); |
1da177e4 | 1889 | |
fef20d9c | 1890 | fmt += read; |
1da177e4 | 1891 | |
fef20d9c FW |
1892 | switch (spec.type) { |
1893 | case FORMAT_TYPE_NONE: { | |
1894 | int copy = read; | |
1895 | if (str < end) { | |
1896 | if (copy > end - str) | |
1897 | copy = end - str; | |
1898 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1899 | } |
fef20d9c FW |
1900 | str += read; |
1901 | break; | |
1da177e4 LT |
1902 | } |
1903 | ||
ed681a91 | 1904 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1905 | spec.field_width = va_arg(args, int); |
1906 | break; | |
1da177e4 | 1907 | |
fef20d9c FW |
1908 | case FORMAT_TYPE_PRECISION: |
1909 | spec.precision = va_arg(args, int); | |
1910 | break; | |
1da177e4 | 1911 | |
d4be151b AGR |
1912 | case FORMAT_TYPE_CHAR: { |
1913 | char c; | |
1914 | ||
fef20d9c FW |
1915 | if (!(spec.flags & LEFT)) { |
1916 | while (--spec.field_width > 0) { | |
f796937a | 1917 | if (str < end) |
1da177e4 LT |
1918 | *str = ' '; |
1919 | ++str; | |
1da177e4 | 1920 | |
fef20d9c FW |
1921 | } |
1922 | } | |
1923 | c = (unsigned char) va_arg(args, int); | |
1924 | if (str < end) | |
1925 | *str = c; | |
1926 | ++str; | |
1927 | while (--spec.field_width > 0) { | |
f796937a | 1928 | if (str < end) |
fef20d9c | 1929 | *str = ' '; |
1da177e4 | 1930 | ++str; |
fef20d9c FW |
1931 | } |
1932 | break; | |
d4be151b | 1933 | } |
1da177e4 | 1934 | |
fef20d9c FW |
1935 | case FORMAT_TYPE_STR: |
1936 | str = string(str, end, va_arg(args, char *), spec); | |
1937 | break; | |
1da177e4 | 1938 | |
fef20d9c | 1939 | case FORMAT_TYPE_PTR: |
ffbfed03 | 1940 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
1941 | spec); |
1942 | while (isalnum(*fmt)) | |
1943 | fmt++; | |
1944 | break; | |
1da177e4 | 1945 | |
fef20d9c FW |
1946 | case FORMAT_TYPE_PERCENT_CHAR: |
1947 | if (str < end) | |
1948 | *str = '%'; | |
1949 | ++str; | |
1950 | break; | |
1da177e4 | 1951 | |
fef20d9c | 1952 | case FORMAT_TYPE_INVALID: |
b006f19b RV |
1953 | /* |
1954 | * Presumably the arguments passed gcc's type | |
1955 | * checking, but there is no safe or sane way | |
1956 | * for us to continue parsing the format and | |
1957 | * fetching from the va_list; the remaining | |
1958 | * specifiers and arguments would be out of | |
1959 | * sync. | |
1960 | */ | |
1961 | goto out; | |
fef20d9c | 1962 | |
fef20d9c FW |
1963 | default: |
1964 | switch (spec.type) { | |
1965 | case FORMAT_TYPE_LONG_LONG: | |
1966 | num = va_arg(args, long long); | |
1967 | break; | |
1968 | case FORMAT_TYPE_ULONG: | |
1969 | num = va_arg(args, unsigned long); | |
1970 | break; | |
1971 | case FORMAT_TYPE_LONG: | |
1972 | num = va_arg(args, long); | |
1973 | break; | |
1974 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
1975 | if (spec.flags & SIGN) |
1976 | num = va_arg(args, ssize_t); | |
1977 | else | |
1978 | num = va_arg(args, size_t); | |
fef20d9c FW |
1979 | break; |
1980 | case FORMAT_TYPE_PTRDIFF: | |
1981 | num = va_arg(args, ptrdiff_t); | |
1982 | break; | |
a4e94ef0 Z |
1983 | case FORMAT_TYPE_UBYTE: |
1984 | num = (unsigned char) va_arg(args, int); | |
1985 | break; | |
1986 | case FORMAT_TYPE_BYTE: | |
1987 | num = (signed char) va_arg(args, int); | |
1988 | break; | |
fef20d9c FW |
1989 | case FORMAT_TYPE_USHORT: |
1990 | num = (unsigned short) va_arg(args, int); | |
1991 | break; | |
1992 | case FORMAT_TYPE_SHORT: | |
1993 | num = (short) va_arg(args, int); | |
1994 | break; | |
39e874f8 FW |
1995 | case FORMAT_TYPE_INT: |
1996 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1997 | break; |
1998 | default: | |
1999 | num = va_arg(args, unsigned int); | |
2000 | } | |
2001 | ||
2002 | str = number(str, end, num, spec); | |
1da177e4 | 2003 | } |
1da177e4 | 2004 | } |
fef20d9c | 2005 | |
b006f19b | 2006 | out: |
f796937a JF |
2007 | if (size > 0) { |
2008 | if (str < end) | |
2009 | *str = '\0'; | |
2010 | else | |
0a6047ee | 2011 | end[-1] = '\0'; |
f796937a | 2012 | } |
fef20d9c | 2013 | |
f796937a | 2014 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 2015 | return str-buf; |
fef20d9c | 2016 | |
1da177e4 | 2017 | } |
1da177e4 LT |
2018 | EXPORT_SYMBOL(vsnprintf); |
2019 | ||
2020 | /** | |
2021 | * vscnprintf - Format a string and place it in a buffer | |
2022 | * @buf: The buffer to place the result into | |
2023 | * @size: The size of the buffer, including the trailing null space | |
2024 | * @fmt: The format string to use | |
2025 | * @args: Arguments for the format string | |
2026 | * | |
2027 | * The return value is the number of characters which have been written into | |
b921c69f | 2028 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
2029 | * returns 0. |
2030 | * | |
ba1835eb | 2031 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
2032 | * |
2033 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2034 | */ |
2035 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2036 | { | |
2037 | int i; | |
2038 | ||
7b9186f5 AGR |
2039 | i = vsnprintf(buf, size, fmt, args); |
2040 | ||
b921c69f AA |
2041 | if (likely(i < size)) |
2042 | return i; | |
2043 | if (size != 0) | |
2044 | return size - 1; | |
2045 | return 0; | |
1da177e4 | 2046 | } |
1da177e4 LT |
2047 | EXPORT_SYMBOL(vscnprintf); |
2048 | ||
2049 | /** | |
2050 | * snprintf - Format a string and place it in a buffer | |
2051 | * @buf: The buffer to place the result into | |
2052 | * @size: The size of the buffer, including the trailing null space | |
2053 | * @fmt: The format string to use | |
2054 | * @...: Arguments for the format string | |
2055 | * | |
2056 | * The return value is the number of characters which would be | |
2057 | * generated for the given input, excluding the trailing null, | |
2058 | * as per ISO C99. If the return is greater than or equal to | |
2059 | * @size, the resulting string is truncated. | |
20036fdc AK |
2060 | * |
2061 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2062 | */ |
7b9186f5 | 2063 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2064 | { |
2065 | va_list args; | |
2066 | int i; | |
2067 | ||
2068 | va_start(args, fmt); | |
7b9186f5 | 2069 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2070 | va_end(args); |
7b9186f5 | 2071 | |
1da177e4 LT |
2072 | return i; |
2073 | } | |
1da177e4 LT |
2074 | EXPORT_SYMBOL(snprintf); |
2075 | ||
2076 | /** | |
2077 | * scnprintf - Format a string and place it in a buffer | |
2078 | * @buf: The buffer to place the result into | |
2079 | * @size: The size of the buffer, including the trailing null space | |
2080 | * @fmt: The format string to use | |
2081 | * @...: Arguments for the format string | |
2082 | * | |
2083 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2084 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2085 | */ |
2086 | ||
7b9186f5 | 2087 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2088 | { |
2089 | va_list args; | |
2090 | int i; | |
2091 | ||
2092 | va_start(args, fmt); | |
b921c69f | 2093 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2094 | va_end(args); |
7b9186f5 | 2095 | |
b921c69f | 2096 | return i; |
1da177e4 LT |
2097 | } |
2098 | EXPORT_SYMBOL(scnprintf); | |
2099 | ||
2100 | /** | |
2101 | * vsprintf - Format a string and place it in a buffer | |
2102 | * @buf: The buffer to place the result into | |
2103 | * @fmt: The format string to use | |
2104 | * @args: Arguments for the format string | |
2105 | * | |
2106 | * The function returns the number of characters written | |
72fd4a35 | 2107 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2108 | * buffer overflows. |
2109 | * | |
ba1835eb | 2110 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2111 | * |
2112 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2113 | */ |
2114 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2115 | { | |
2116 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2117 | } | |
1da177e4 LT |
2118 | EXPORT_SYMBOL(vsprintf); |
2119 | ||
2120 | /** | |
2121 | * sprintf - Format a string and place it in a buffer | |
2122 | * @buf: The buffer to place the result into | |
2123 | * @fmt: The format string to use | |
2124 | * @...: Arguments for the format string | |
2125 | * | |
2126 | * The function returns the number of characters written | |
72fd4a35 | 2127 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2128 | * buffer overflows. |
20036fdc AK |
2129 | * |
2130 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2131 | */ |
7b9186f5 | 2132 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2133 | { |
2134 | va_list args; | |
2135 | int i; | |
2136 | ||
2137 | va_start(args, fmt); | |
7b9186f5 | 2138 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2139 | va_end(args); |
7b9186f5 | 2140 | |
1da177e4 LT |
2141 | return i; |
2142 | } | |
1da177e4 LT |
2143 | EXPORT_SYMBOL(sprintf); |
2144 | ||
4370aa4a LJ |
2145 | #ifdef CONFIG_BINARY_PRINTF |
2146 | /* | |
2147 | * bprintf service: | |
2148 | * vbin_printf() - VA arguments to binary data | |
2149 | * bstr_printf() - Binary data to text string | |
2150 | */ | |
2151 | ||
2152 | /** | |
2153 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2154 | * @bin_buf: The buffer to place args' binary value | |
2155 | * @size: The size of the buffer(by words(32bits), not characters) | |
2156 | * @fmt: The format string to use | |
2157 | * @args: Arguments for the format string | |
2158 | * | |
2159 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2160 | * is skipped. |
4370aa4a LJ |
2161 | * |
2162 | * The return value is the number of words(32bits) which would be generated for | |
2163 | * the given input. | |
2164 | * | |
2165 | * NOTE: | |
2166 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2167 | * valid for bstr_printf(). | |
2168 | */ | |
2169 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2170 | { | |
fef20d9c | 2171 | struct printf_spec spec = {0}; |
4370aa4a | 2172 | char *str, *end; |
4370aa4a LJ |
2173 | |
2174 | str = (char *)bin_buf; | |
2175 | end = (char *)(bin_buf + size); | |
2176 | ||
2177 | #define save_arg(type) \ | |
2178 | do { \ | |
2179 | if (sizeof(type) == 8) { \ | |
2180 | unsigned long long value; \ | |
2181 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2182 | value = va_arg(args, unsigned long long); \ | |
2183 | if (str + sizeof(type) <= end) { \ | |
2184 | *(u32 *)str = *(u32 *)&value; \ | |
2185 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2186 | } \ | |
2187 | } else { \ | |
2188 | unsigned long value; \ | |
2189 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2190 | value = va_arg(args, int); \ | |
2191 | if (str + sizeof(type) <= end) \ | |
2192 | *(typeof(type) *)str = (type)value; \ | |
2193 | } \ | |
2194 | str += sizeof(type); \ | |
2195 | } while (0) | |
2196 | ||
fef20d9c | 2197 | while (*fmt) { |
d4be151b | 2198 | int read = format_decode(fmt, &spec); |
4370aa4a | 2199 | |
fef20d9c | 2200 | fmt += read; |
4370aa4a | 2201 | |
fef20d9c FW |
2202 | switch (spec.type) { |
2203 | case FORMAT_TYPE_NONE: | |
d4be151b | 2204 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2205 | break; |
b006f19b RV |
2206 | case FORMAT_TYPE_INVALID: |
2207 | goto out; | |
fef20d9c | 2208 | |
ed681a91 | 2209 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2210 | case FORMAT_TYPE_PRECISION: |
2211 | save_arg(int); | |
2212 | break; | |
2213 | ||
2214 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2215 | save_arg(char); |
fef20d9c FW |
2216 | break; |
2217 | ||
2218 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
2219 | const char *save_str = va_arg(args, char *); |
2220 | size_t len; | |
6c356634 | 2221 | |
4370aa4a LJ |
2222 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2223 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 2224 | save_str = "(null)"; |
6c356634 AGR |
2225 | len = strlen(save_str) + 1; |
2226 | if (str + len < end) | |
2227 | memcpy(str, save_str, len); | |
2228 | str += len; | |
fef20d9c | 2229 | break; |
4370aa4a | 2230 | } |
fef20d9c FW |
2231 | |
2232 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
2233 | save_arg(void *); |
2234 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 2235 | while (isalnum(*fmt)) |
4370aa4a | 2236 | fmt++; |
fef20d9c FW |
2237 | break; |
2238 | ||
fef20d9c FW |
2239 | default: |
2240 | switch (spec.type) { | |
2241 | ||
2242 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2243 | save_arg(long long); |
fef20d9c FW |
2244 | break; |
2245 | case FORMAT_TYPE_ULONG: | |
2246 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2247 | save_arg(unsigned long); |
fef20d9c FW |
2248 | break; |
2249 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2250 | save_arg(size_t); |
fef20d9c FW |
2251 | break; |
2252 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2253 | save_arg(ptrdiff_t); |
fef20d9c | 2254 | break; |
a4e94ef0 Z |
2255 | case FORMAT_TYPE_UBYTE: |
2256 | case FORMAT_TYPE_BYTE: | |
2257 | save_arg(char); | |
2258 | break; | |
fef20d9c FW |
2259 | case FORMAT_TYPE_USHORT: |
2260 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2261 | save_arg(short); |
fef20d9c FW |
2262 | break; |
2263 | default: | |
4370aa4a | 2264 | save_arg(int); |
fef20d9c | 2265 | } |
4370aa4a LJ |
2266 | } |
2267 | } | |
fef20d9c | 2268 | |
b006f19b | 2269 | out: |
7b9186f5 | 2270 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2271 | #undef save_arg |
4370aa4a LJ |
2272 | } |
2273 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2274 | ||
2275 | /** | |
2276 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2277 | * @buf: The buffer to place the result into | |
2278 | * @size: The size of the buffer, including the trailing null space | |
2279 | * @fmt: The format string to use | |
2280 | * @bin_buf: Binary arguments for the format string | |
2281 | * | |
2282 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2283 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2284 | * a binary buffer that generated by vbin_printf. | |
2285 | * | |
2286 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2287 | * see vsnprintf comment for details. |
4370aa4a LJ |
2288 | * |
2289 | * The return value is the number of characters which would | |
2290 | * be generated for the given input, excluding the trailing | |
2291 | * '\0', as per ISO C99. If you want to have the exact | |
2292 | * number of characters written into @buf as return value | |
2293 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2294 | * return is greater than or equal to @size, the resulting | |
2295 | * string is truncated. | |
2296 | */ | |
2297 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2298 | { | |
fef20d9c | 2299 | struct printf_spec spec = {0}; |
d4be151b AGR |
2300 | char *str, *end; |
2301 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2302 | |
762abb51 | 2303 | if (WARN_ON_ONCE(size > INT_MAX)) |
4370aa4a | 2304 | return 0; |
4370aa4a LJ |
2305 | |
2306 | str = buf; | |
2307 | end = buf + size; | |
2308 | ||
2309 | #define get_arg(type) \ | |
2310 | ({ \ | |
2311 | typeof(type) value; \ | |
2312 | if (sizeof(type) == 8) { \ | |
2313 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2314 | *(u32 *)&value = *(u32 *)args; \ | |
2315 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2316 | } else { \ | |
2317 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2318 | value = *(typeof(type) *)args; \ | |
2319 | } \ | |
2320 | args += sizeof(type); \ | |
2321 | value; \ | |
2322 | }) | |
2323 | ||
2324 | /* Make sure end is always >= buf */ | |
2325 | if (end < buf) { | |
2326 | end = ((void *)-1); | |
2327 | size = end - buf; | |
2328 | } | |
2329 | ||
fef20d9c | 2330 | while (*fmt) { |
fef20d9c | 2331 | const char *old_fmt = fmt; |
d4be151b | 2332 | int read = format_decode(fmt, &spec); |
4370aa4a | 2333 | |
fef20d9c | 2334 | fmt += read; |
4370aa4a | 2335 | |
fef20d9c FW |
2336 | switch (spec.type) { |
2337 | case FORMAT_TYPE_NONE: { | |
2338 | int copy = read; | |
2339 | if (str < end) { | |
2340 | if (copy > end - str) | |
2341 | copy = end - str; | |
2342 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2343 | } |
fef20d9c FW |
2344 | str += read; |
2345 | break; | |
4370aa4a LJ |
2346 | } |
2347 | ||
ed681a91 | 2348 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2349 | spec.field_width = get_arg(int); |
2350 | break; | |
4370aa4a | 2351 | |
fef20d9c FW |
2352 | case FORMAT_TYPE_PRECISION: |
2353 | spec.precision = get_arg(int); | |
2354 | break; | |
4370aa4a | 2355 | |
d4be151b AGR |
2356 | case FORMAT_TYPE_CHAR: { |
2357 | char c; | |
2358 | ||
fef20d9c FW |
2359 | if (!(spec.flags & LEFT)) { |
2360 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2361 | if (str < end) |
2362 | *str = ' '; | |
2363 | ++str; | |
2364 | } | |
2365 | } | |
2366 | c = (unsigned char) get_arg(char); | |
2367 | if (str < end) | |
2368 | *str = c; | |
2369 | ++str; | |
fef20d9c | 2370 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2371 | if (str < end) |
2372 | *str = ' '; | |
2373 | ++str; | |
2374 | } | |
fef20d9c | 2375 | break; |
d4be151b | 2376 | } |
4370aa4a | 2377 | |
fef20d9c | 2378 | case FORMAT_TYPE_STR: { |
4370aa4a | 2379 | const char *str_arg = args; |
d4be151b | 2380 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2381 | str = string(str, end, (char *)str_arg, spec); |
2382 | break; | |
4370aa4a LJ |
2383 | } |
2384 | ||
fef20d9c | 2385 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2386 | str = pointer(fmt, str, end, get_arg(void *), spec); |
fef20d9c | 2387 | while (isalnum(*fmt)) |
4370aa4a | 2388 | fmt++; |
fef20d9c | 2389 | break; |
4370aa4a | 2390 | |
fef20d9c | 2391 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
2392 | if (str < end) |
2393 | *str = '%'; | |
2394 | ++str; | |
fef20d9c FW |
2395 | break; |
2396 | ||
b006f19b RV |
2397 | case FORMAT_TYPE_INVALID: |
2398 | goto out; | |
2399 | ||
d4be151b AGR |
2400 | default: { |
2401 | unsigned long long num; | |
2402 | ||
fef20d9c FW |
2403 | switch (spec.type) { |
2404 | ||
2405 | case FORMAT_TYPE_LONG_LONG: | |
2406 | num = get_arg(long long); | |
2407 | break; | |
2408 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2409 | case FORMAT_TYPE_LONG: |
2410 | num = get_arg(unsigned long); | |
2411 | break; | |
2412 | case FORMAT_TYPE_SIZE_T: | |
2413 | num = get_arg(size_t); | |
2414 | break; | |
2415 | case FORMAT_TYPE_PTRDIFF: | |
2416 | num = get_arg(ptrdiff_t); | |
2417 | break; | |
a4e94ef0 Z |
2418 | case FORMAT_TYPE_UBYTE: |
2419 | num = get_arg(unsigned char); | |
2420 | break; | |
2421 | case FORMAT_TYPE_BYTE: | |
2422 | num = get_arg(signed char); | |
2423 | break; | |
fef20d9c FW |
2424 | case FORMAT_TYPE_USHORT: |
2425 | num = get_arg(unsigned short); | |
2426 | break; | |
2427 | case FORMAT_TYPE_SHORT: | |
2428 | num = get_arg(short); | |
2429 | break; | |
2430 | case FORMAT_TYPE_UINT: | |
2431 | num = get_arg(unsigned int); | |
2432 | break; | |
2433 | default: | |
2434 | num = get_arg(int); | |
2435 | } | |
2436 | ||
2437 | str = number(str, end, num, spec); | |
d4be151b AGR |
2438 | } /* default: */ |
2439 | } /* switch(spec.type) */ | |
2440 | } /* while(*fmt) */ | |
fef20d9c | 2441 | |
b006f19b | 2442 | out: |
4370aa4a LJ |
2443 | if (size > 0) { |
2444 | if (str < end) | |
2445 | *str = '\0'; | |
2446 | else | |
2447 | end[-1] = '\0'; | |
2448 | } | |
fef20d9c | 2449 | |
4370aa4a LJ |
2450 | #undef get_arg |
2451 | ||
2452 | /* the trailing null byte doesn't count towards the total */ | |
2453 | return str - buf; | |
2454 | } | |
2455 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2456 | ||
2457 | /** | |
2458 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2459 | * @bin_buf: The buffer to place args' binary value | |
2460 | * @size: The size of the buffer(by words(32bits), not characters) | |
2461 | * @fmt: The format string to use | |
2462 | * @...: Arguments for the format string | |
2463 | * | |
2464 | * The function returns the number of words(u32) written | |
2465 | * into @bin_buf. | |
2466 | */ | |
2467 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2468 | { | |
2469 | va_list args; | |
2470 | int ret; | |
2471 | ||
2472 | va_start(args, fmt); | |
2473 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2474 | va_end(args); | |
7b9186f5 | 2475 | |
4370aa4a LJ |
2476 | return ret; |
2477 | } | |
2478 | EXPORT_SYMBOL_GPL(bprintf); | |
2479 | ||
2480 | #endif /* CONFIG_BINARY_PRINTF */ | |
2481 | ||
1da177e4 LT |
2482 | /** |
2483 | * vsscanf - Unformat a buffer into a list of arguments | |
2484 | * @buf: input buffer | |
2485 | * @fmt: format of buffer | |
2486 | * @args: arguments | |
2487 | */ | |
7b9186f5 | 2488 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2489 | { |
2490 | const char *str = buf; | |
2491 | char *next; | |
2492 | char digit; | |
2493 | int num = 0; | |
ef0658f3 | 2494 | u8 qualifier; |
53809751 JB |
2495 | unsigned int base; |
2496 | union { | |
2497 | long long s; | |
2498 | unsigned long long u; | |
2499 | } val; | |
ef0658f3 | 2500 | s16 field_width; |
d4be151b | 2501 | bool is_sign; |
1da177e4 | 2502 | |
da99075c | 2503 | while (*fmt) { |
1da177e4 LT |
2504 | /* skip any white space in format */ |
2505 | /* white space in format matchs any amount of | |
2506 | * white space, including none, in the input. | |
2507 | */ | |
2508 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2509 | fmt = skip_spaces(++fmt); |
2510 | str = skip_spaces(str); | |
1da177e4 LT |
2511 | } |
2512 | ||
2513 | /* anything that is not a conversion must match exactly */ | |
2514 | if (*fmt != '%' && *fmt) { | |
2515 | if (*fmt++ != *str++) | |
2516 | break; | |
2517 | continue; | |
2518 | } | |
2519 | ||
2520 | if (!*fmt) | |
2521 | break; | |
2522 | ++fmt; | |
7b9186f5 | 2523 | |
1da177e4 LT |
2524 | /* skip this conversion. |
2525 | * advance both strings to next white space | |
2526 | */ | |
2527 | if (*fmt == '*') { | |
da99075c JB |
2528 | if (!*str) |
2529 | break; | |
8fccae2c | 2530 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
2531 | fmt++; |
2532 | while (!isspace(*str) && *str) | |
2533 | str++; | |
2534 | continue; | |
2535 | } | |
2536 | ||
2537 | /* get field width */ | |
2538 | field_width = -1; | |
53809751 | 2539 | if (isdigit(*fmt)) { |
1da177e4 | 2540 | field_width = skip_atoi(&fmt); |
53809751 JB |
2541 | if (field_width <= 0) |
2542 | break; | |
2543 | } | |
1da177e4 LT |
2544 | |
2545 | /* get conversion qualifier */ | |
2546 | qualifier = -1; | |
75fb8f26 AS |
2547 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2548 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
2549 | qualifier = *fmt++; |
2550 | if (unlikely(qualifier == *fmt)) { | |
2551 | if (qualifier == 'h') { | |
2552 | qualifier = 'H'; | |
2553 | fmt++; | |
2554 | } else if (qualifier == 'l') { | |
2555 | qualifier = 'L'; | |
2556 | fmt++; | |
2557 | } | |
2558 | } | |
2559 | } | |
1da177e4 | 2560 | |
da99075c JB |
2561 | if (!*fmt) |
2562 | break; | |
2563 | ||
2564 | if (*fmt == 'n') { | |
2565 | /* return number of characters read so far */ | |
2566 | *va_arg(args, int *) = str - buf; | |
2567 | ++fmt; | |
2568 | continue; | |
2569 | } | |
2570 | ||
2571 | if (!*str) | |
1da177e4 LT |
2572 | break; |
2573 | ||
d4be151b | 2574 | base = 10; |
3f623eba | 2575 | is_sign = false; |
d4be151b | 2576 | |
7b9186f5 | 2577 | switch (*fmt++) { |
1da177e4 LT |
2578 | case 'c': |
2579 | { | |
7b9186f5 | 2580 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2581 | if (field_width == -1) |
2582 | field_width = 1; | |
2583 | do { | |
2584 | *s++ = *str++; | |
2585 | } while (--field_width > 0 && *str); | |
2586 | num++; | |
2587 | } | |
2588 | continue; | |
2589 | case 's': | |
2590 | { | |
7b9186f5 AGR |
2591 | char *s = (char *)va_arg(args, char *); |
2592 | if (field_width == -1) | |
4be929be | 2593 | field_width = SHRT_MAX; |
1da177e4 | 2594 | /* first, skip leading white space in buffer */ |
e7d2860b | 2595 | str = skip_spaces(str); |
1da177e4 LT |
2596 | |
2597 | /* now copy until next white space */ | |
7b9186f5 | 2598 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2599 | *s++ = *str++; |
1da177e4 LT |
2600 | *s = '\0'; |
2601 | num++; | |
2602 | } | |
2603 | continue; | |
1da177e4 LT |
2604 | case 'o': |
2605 | base = 8; | |
2606 | break; | |
2607 | case 'x': | |
2608 | case 'X': | |
2609 | base = 16; | |
2610 | break; | |
2611 | case 'i': | |
7b9186f5 | 2612 | base = 0; |
1da177e4 | 2613 | case 'd': |
3f623eba | 2614 | is_sign = true; |
1da177e4 LT |
2615 | case 'u': |
2616 | break; | |
2617 | case '%': | |
2618 | /* looking for '%' in str */ | |
7b9186f5 | 2619 | if (*str++ != '%') |
1da177e4 LT |
2620 | return num; |
2621 | continue; | |
2622 | default: | |
2623 | /* invalid format; stop here */ | |
2624 | return num; | |
2625 | } | |
2626 | ||
2627 | /* have some sort of integer conversion. | |
2628 | * first, skip white space in buffer. | |
2629 | */ | |
e7d2860b | 2630 | str = skip_spaces(str); |
1da177e4 LT |
2631 | |
2632 | digit = *str; | |
2633 | if (is_sign && digit == '-') | |
2634 | digit = *(str + 1); | |
2635 | ||
2636 | if (!digit | |
7b9186f5 AGR |
2637 | || (base == 16 && !isxdigit(digit)) |
2638 | || (base == 10 && !isdigit(digit)) | |
2639 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2640 | || (base == 0 && !isdigit(digit))) | |
2641 | break; | |
1da177e4 | 2642 | |
53809751 JB |
2643 | if (is_sign) |
2644 | val.s = qualifier != 'L' ? | |
2645 | simple_strtol(str, &next, base) : | |
2646 | simple_strtoll(str, &next, base); | |
2647 | else | |
2648 | val.u = qualifier != 'L' ? | |
2649 | simple_strtoul(str, &next, base) : | |
2650 | simple_strtoull(str, &next, base); | |
2651 | ||
2652 | if (field_width > 0 && next - str > field_width) { | |
2653 | if (base == 0) | |
2654 | _parse_integer_fixup_radix(str, &base); | |
2655 | while (next - str > field_width) { | |
2656 | if (is_sign) | |
2657 | val.s = div_s64(val.s, base); | |
2658 | else | |
2659 | val.u = div_u64(val.u, base); | |
2660 | --next; | |
2661 | } | |
2662 | } | |
2663 | ||
7b9186f5 | 2664 | switch (qualifier) { |
1da177e4 | 2665 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2666 | if (is_sign) |
2667 | *va_arg(args, signed char *) = val.s; | |
2668 | else | |
2669 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2670 | break; |
2671 | case 'h': | |
53809751 JB |
2672 | if (is_sign) |
2673 | *va_arg(args, short *) = val.s; | |
2674 | else | |
2675 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2676 | break; |
2677 | case 'l': | |
53809751 JB |
2678 | if (is_sign) |
2679 | *va_arg(args, long *) = val.s; | |
2680 | else | |
2681 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2682 | break; |
2683 | case 'L': | |
53809751 JB |
2684 | if (is_sign) |
2685 | *va_arg(args, long long *) = val.s; | |
2686 | else | |
2687 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 LT |
2688 | break; |
2689 | case 'Z': | |
2690 | case 'z': | |
53809751 JB |
2691 | *va_arg(args, size_t *) = val.u; |
2692 | break; | |
1da177e4 | 2693 | default: |
53809751 JB |
2694 | if (is_sign) |
2695 | *va_arg(args, int *) = val.s; | |
2696 | else | |
2697 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
2698 | break; |
2699 | } | |
2700 | num++; | |
2701 | ||
2702 | if (!next) | |
2703 | break; | |
2704 | str = next; | |
2705 | } | |
c6b40d16 | 2706 | |
1da177e4 LT |
2707 | return num; |
2708 | } | |
1da177e4 LT |
2709 | EXPORT_SYMBOL(vsscanf); |
2710 | ||
2711 | /** | |
2712 | * sscanf - Unformat a buffer into a list of arguments | |
2713 | * @buf: input buffer | |
2714 | * @fmt: formatting of buffer | |
2715 | * @...: resulting arguments | |
2716 | */ | |
7b9186f5 | 2717 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2718 | { |
2719 | va_list args; | |
2720 | int i; | |
2721 | ||
7b9186f5 AGR |
2722 | va_start(args, fmt); |
2723 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2724 | va_end(args); |
7b9186f5 | 2725 | |
1da177e4 LT |
2726 | return i; |
2727 | } | |
1da177e4 | 2728 | EXPORT_SYMBOL(sscanf); |