blob: 8378c136b6e15725d73637ddc2aac1251308814a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
André Goddard Rosa7b9186f2009-12-14 18:00:57 -080012/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
14 * - changed to provide snprintf and vsnprintf functions
15 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
16 * - scnprintf and vscnprintf
17 */
18
19#include <stdarg.h>
20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/string.h>
23#include <linux/ctype.h>
24#include <linux/kernel.h>
Linus Torvalds0fe1ef22008-07-06 16:43:12 -070025#include <linux/kallsyms.h>
26#include <linux/uaccess.h>
Linus Torvalds332d2e72008-10-20 15:07:34 +110027#include <linux/ioport.h>
Joe Perches8a27f7c2009-08-17 12:29:44 +000028#include <net/addrconf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Tim Schmielau4e57b682005-10-30 15:03:48 -080030#include <asm/page.h> /* for PAGE_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/div64.h>
James Bottomleydeac93d2008-09-03 20:43:36 -050032#include <asm/sections.h> /* for dereference_function_descriptor() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Denys Vlasenko9b706ae2008-02-09 23:24:09 +010034/* Works only for digits and letters, but small and fast */
35#define TOLOWER(x) ((x) | 0x20)
36
Harvey Harrisonaa46a632008-10-16 13:40:34 -070037static unsigned int simple_guess_base(const char *cp)
38{
39 if (cp[0] == '0') {
40 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
41 return 16;
42 else
43 return 8;
44 } else {
45 return 10;
46 }
47}
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 * simple_strtoull - convert a string to an unsigned long long
51 * @cp: The start of the string
52 * @endp: A pointer to the end of the parsed string will be placed here
53 * @base: The number base to use
54 */
Harvey Harrison22d27052008-10-16 13:40:35 -070055unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Harvey Harrisonaa46a632008-10-16 13:40:34 -070057 unsigned long long result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Harvey Harrisonaa46a632008-10-16 13:40:34 -070059 if (!base)
60 base = simple_guess_base(cp);
61
62 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
63 cp += 2;
64
65 while (isxdigit(*cp)) {
66 unsigned int value;
67
68 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
69 if (value >= base)
70 break;
71 result = result * base + value;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 cp++;
73 }
74 if (endp)
75 *endp = (char *)cp;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -080076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 return result;
78}
Linus Torvalds1da177e2005-04-16 15:20:36 -070079EXPORT_SYMBOL(simple_strtoull);
80
81/**
André Goddard Rosa922ac252009-12-14 18:01:01 -080082 * simple_strtoul - convert a string to an unsigned long
83 * @cp: The start of the string
84 * @endp: A pointer to the end of the parsed string will be placed here
85 * @base: The number base to use
86 */
87unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
88{
89 return simple_strtoull(cp, endp, base);
90}
91EXPORT_SYMBOL(simple_strtoul);
92
93/**
94 * simple_strtol - convert a string to a signed long
95 * @cp: The start of the string
96 * @endp: A pointer to the end of the parsed string will be placed here
97 * @base: The number base to use
98 */
99long simple_strtol(const char *cp, char **endp, unsigned int base)
100{
101 if (*cp == '-')
102 return -simple_strtoul(cp + 1, endp, base);
103
104 return simple_strtoul(cp, endp, base);
105}
106EXPORT_SYMBOL(simple_strtol);
107
108/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 * simple_strtoll - convert a string to a signed long long
110 * @cp: The start of the string
111 * @endp: A pointer to the end of the parsed string will be placed here
112 * @base: The number base to use
113 */
Harvey Harrison22d27052008-10-16 13:40:35 -0700114long long simple_strtoll(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800116 if (*cp == '-')
Harvey Harrison22d27052008-10-16 13:40:35 -0700117 return -simple_strtoull(cp + 1, endp, base);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800118
Harvey Harrison22d27052008-10-16 13:40:35 -0700119 return simple_strtoull(cp, endp, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120}
Hans Verkuil98d5ce02010-04-23 13:18:04 -0400121EXPORT_SYMBOL(simple_strtoll);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Yi Yang06b2a762008-02-08 04:21:57 -0800123/**
124 * strict_strtoul - convert a string to an unsigned long strictly
125 * @cp: The string to be converted
126 * @base: The number base to use
127 * @res: The converted result value
128 *
129 * strict_strtoul converts a string to an unsigned long only if the
130 * string is really an unsigned long string, any string containing
131 * any invalid char at the tail will be rejected and -EINVAL is returned,
132 * only a newline char at the tail is acceptible because people generally
133 * change a module parameter in the following way:
134 *
135 * echo 1024 > /sys/module/e1000/parameters/copybreak
136 *
137 * echo will append a newline to the tail.
138 *
139 * It returns 0 if conversion is successful and *res is set to the converted
140 * value, otherwise it returns -EINVAL and *res is set to 0.
141 *
142 * simple_strtoul just ignores the successive invalid characters and
143 * return the converted value of prefix part of the string.
144 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700145int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
146{
147 char *tail;
148 unsigned long val;
Harvey Harrison9d85db22008-10-16 13:40:35 -0700149
150 *res = 0;
Michal Nazarewicz559b1402010-08-09 17:20:54 -0700151 if (!*cp)
Harvey Harrison9d85db22008-10-16 13:40:35 -0700152 return -EINVAL;
153
154 val = simple_strtoul(cp, &tail, base);
Pavel Macheke899aa82009-01-06 14:40:53 -0800155 if (tail == cp)
156 return -EINVAL;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800157
Michal Nazarewicz559b1402010-08-09 17:20:54 -0700158 if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
Harvey Harrison9d85db22008-10-16 13:40:35 -0700159 *res = val;
160 return 0;
161 }
162
163 return -EINVAL;
164}
165EXPORT_SYMBOL(strict_strtoul);
Yi Yang06b2a762008-02-08 04:21:57 -0800166
167/**
168 * strict_strtol - convert a string to a long strictly
169 * @cp: The string to be converted
170 * @base: The number base to use
171 * @res: The converted result value
172 *
173 * strict_strtol is similiar to strict_strtoul, but it allows the first
174 * character of a string is '-'.
175 *
176 * It returns 0 if conversion is successful and *res is set to the converted
177 * value, otherwise it returns -EINVAL and *res is set to 0.
178 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700179int strict_strtol(const char *cp, unsigned int base, long *res)
180{
181 int ret;
182 if (*cp == '-') {
183 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
184 if (!ret)
185 *res = -(*res);
186 } else {
187 ret = strict_strtoul(cp, base, (unsigned long *)res);
188 }
189
190 return ret;
191}
192EXPORT_SYMBOL(strict_strtol);
Yi Yang06b2a762008-02-08 04:21:57 -0800193
194/**
195 * strict_strtoull - convert a string to an unsigned long long strictly
196 * @cp: The string to be converted
197 * @base: The number base to use
198 * @res: The converted result value
199 *
200 * strict_strtoull converts a string to an unsigned long long only if the
201 * string is really an unsigned long long string, any string containing
202 * any invalid char at the tail will be rejected and -EINVAL is returned,
203 * only a newline char at the tail is acceptible because people generally
204 * change a module parameter in the following way:
205 *
206 * echo 1024 > /sys/module/e1000/parameters/copybreak
207 *
208 * echo will append a newline to the tail of the string.
209 *
210 * It returns 0 if conversion is successful and *res is set to the converted
211 * value, otherwise it returns -EINVAL and *res is set to 0.
212 *
213 * simple_strtoull just ignores the successive invalid characters and
214 * return the converted value of prefix part of the string.
215 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700216int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
217{
218 char *tail;
219 unsigned long long val;
Harvey Harrison9d85db22008-10-16 13:40:35 -0700220
221 *res = 0;
Michal Nazarewicz559b1402010-08-09 17:20:54 -0700222 if (!*cp)
Harvey Harrison9d85db22008-10-16 13:40:35 -0700223 return -EINVAL;
224
225 val = simple_strtoull(cp, &tail, base);
Pavel Macheke899aa82009-01-06 14:40:53 -0800226 if (tail == cp)
227 return -EINVAL;
Michal Nazarewicz559b1402010-08-09 17:20:54 -0700228 if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
Harvey Harrison9d85db22008-10-16 13:40:35 -0700229 *res = val;
230 return 0;
231 }
232
233 return -EINVAL;
234}
235EXPORT_SYMBOL(strict_strtoull);
Yi Yang06b2a762008-02-08 04:21:57 -0800236
237/**
238 * strict_strtoll - convert a string to a long long strictly
239 * @cp: The string to be converted
240 * @base: The number base to use
241 * @res: The converted result value
242 *
243 * strict_strtoll is similiar to strict_strtoull, but it allows the first
244 * character of a string is '-'.
245 *
246 * It returns 0 if conversion is successful and *res is set to the converted
247 * value, otherwise it returns -EINVAL and *res is set to 0.
248 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700249int strict_strtoll(const char *cp, unsigned int base, long long *res)
250{
251 int ret;
252 if (*cp == '-') {
253 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
254 if (!ret)
255 *res = -(*res);
256 } else {
257 ret = strict_strtoull(cp, base, (unsigned long long *)res);
258 }
Yi Yang06b2a762008-02-08 04:21:57 -0800259
Harvey Harrison9d85db22008-10-16 13:40:35 -0700260 return ret;
261}
Yi Yang06b2a762008-02-08 04:21:57 -0800262EXPORT_SYMBOL(strict_strtoll);
Yi Yang06b2a762008-02-08 04:21:57 -0800263
Joe Perchescf3b4292010-05-24 14:33:16 -0700264static noinline_for_stack
265int skip_atoi(const char **s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800267 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269 while (isdigit(**s))
270 i = i*10 + *((*s)++) - '0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 return i;
273}
274
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700275/* Decimal conversion is by far the most typical, and is used
276 * for /proc and /sys data. This directly impacts e.g. top performance
277 * with many processes running. We optimize it for speed
278 * using code from
279 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
280 * (with permission from the author, Douglas W. Jones). */
281
282/* Formats correctly any integer in [0,99999].
283 * Outputs from one to five digits depending on input.
284 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
Joe Perchescf3b4292010-05-24 14:33:16 -0700285static noinline_for_stack
286char *put_dec_trunc(char *buf, unsigned q)
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700287{
288 unsigned d3, d2, d1, d0;
289 d1 = (q>>4) & 0xf;
290 d2 = (q>>8) & 0xf;
291 d3 = (q>>12);
292
293 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
294 q = (d0 * 0xcd) >> 11;
295 d0 = d0 - 10*q;
296 *buf++ = d0 + '0'; /* least significant digit */
297 d1 = q + 9*d3 + 5*d2 + d1;
298 if (d1 != 0) {
299 q = (d1 * 0xcd) >> 11;
300 d1 = d1 - 10*q;
301 *buf++ = d1 + '0'; /* next digit */
302
303 d2 = q + 2*d2;
304 if ((d2 != 0) || (d3 != 0)) {
305 q = (d2 * 0xd) >> 7;
306 d2 = d2 - 10*q;
307 *buf++ = d2 + '0'; /* next digit */
308
309 d3 = q + 4*d3;
310 if (d3 != 0) {
311 q = (d3 * 0xcd) >> 11;
312 d3 = d3 - 10*q;
313 *buf++ = d3 + '0'; /* next digit */
314 if (q != 0)
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800315 *buf++ = q + '0'; /* most sign. digit */
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700316 }
317 }
318 }
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800319
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700320 return buf;
321}
322/* Same with if's removed. Always emits five digits */
Joe Perchescf3b4292010-05-24 14:33:16 -0700323static noinline_for_stack
324char *put_dec_full(char *buf, unsigned q)
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700325{
326 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
327 /* but anyway, gcc produces better code with full-sized ints */
328 unsigned d3, d2, d1, d0;
329 d1 = (q>>4) & 0xf;
330 d2 = (q>>8) & 0xf;
331 d3 = (q>>12);
332
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800333 /*
334 * Possible ways to approx. divide by 10
335 * gcc -O2 replaces multiply with shifts and adds
336 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
337 * (x * 0x67) >> 10: 1100111
338 * (x * 0x34) >> 9: 110100 - same
339 * (x * 0x1a) >> 8: 11010 - same
340 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
341 */
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700342 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
343 q = (d0 * 0xcd) >> 11;
344 d0 = d0 - 10*q;
345 *buf++ = d0 + '0';
346 d1 = q + 9*d3 + 5*d2 + d1;
347 q = (d1 * 0xcd) >> 11;
348 d1 = d1 - 10*q;
349 *buf++ = d1 + '0';
350
351 d2 = q + 2*d2;
352 q = (d2 * 0xd) >> 7;
353 d2 = d2 - 10*q;
354 *buf++ = d2 + '0';
355
356 d3 = q + 4*d3;
357 q = (d3 * 0xcd) >> 11; /* - shorter code */
358 /* q = (d3 * 0x67) >> 10; - would also work */
359 d3 = d3 - 10*q;
360 *buf++ = d3 + '0';
361 *buf++ = q + '0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800362
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700363 return buf;
364}
365/* No inlining helps gcc to use registers better */
Joe Perchescf3b4292010-05-24 14:33:16 -0700366static noinline_for_stack
367char *put_dec(char *buf, unsigned long long num)
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700368{
369 while (1) {
370 unsigned rem;
371 if (num < 100000)
372 return put_dec_trunc(buf, num);
373 rem = do_div(num, 100000);
374 buf = put_dec_full(buf, rem);
375 }
376}
377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378#define ZEROPAD 1 /* pad with zero */
379#define SIGN 2 /* unsigned/signed long */
380#define PLUS 4 /* show plus */
381#define SPACE 8 /* space if plus */
382#define LEFT 16 /* left justified */
Bjorn Helgaasb89dc5d2010-03-05 10:47:31 -0700383#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
384#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100386enum format_type {
387 FORMAT_TYPE_NONE, /* Just a string part */
Vegard Nossumed681a92009-03-14 12:08:50 +0100388 FORMAT_TYPE_WIDTH,
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100389 FORMAT_TYPE_PRECISION,
390 FORMAT_TYPE_CHAR,
391 FORMAT_TYPE_STR,
392 FORMAT_TYPE_PTR,
393 FORMAT_TYPE_PERCENT_CHAR,
394 FORMAT_TYPE_INVALID,
395 FORMAT_TYPE_LONG_LONG,
396 FORMAT_TYPE_ULONG,
397 FORMAT_TYPE_LONG,
Zhaoleia4e94ef2009-03-27 17:07:05 +0800398 FORMAT_TYPE_UBYTE,
399 FORMAT_TYPE_BYTE,
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100400 FORMAT_TYPE_USHORT,
401 FORMAT_TYPE_SHORT,
402 FORMAT_TYPE_UINT,
403 FORMAT_TYPE_INT,
404 FORMAT_TYPE_NRCHARS,
405 FORMAT_TYPE_SIZE_T,
406 FORMAT_TYPE_PTRDIFF
407};
408
409struct printf_spec {
Joe Perches4e310fd2010-04-14 09:27:40 -0700410 u8 type; /* format_type enum */
Joe Perchesef0658f2010-03-06 17:10:14 -0800411 u8 flags; /* flags to number() */
Joe Perches4e310fd2010-04-14 09:27:40 -0700412 u8 base; /* number base, 8, 10 or 16 only */
413 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
414 s16 field_width; /* width of output field */
415 s16 precision; /* # of digits/chars */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100416};
417
Joe Perchescf3b4292010-05-24 14:33:16 -0700418static noinline_for_stack
419char *number(char *buf, char *end, unsigned long long num,
420 struct printf_spec spec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100422 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
423 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
424
425 char tmp[66];
426 char sign;
427 char locase;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100428 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 int i;
430
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100431 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
432 * produces same digits or (maybe lowercased) letters */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100433 locase = (spec.flags & SMALL);
434 if (spec.flags & LEFT)
435 spec.flags &= ~ZEROPAD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 sign = 0;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100437 if (spec.flags & SIGN) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800438 if ((signed long long)num < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 sign = '-';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800440 num = -(signed long long)num;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100441 spec.field_width--;
442 } else if (spec.flags & PLUS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 sign = '+';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100444 spec.field_width--;
445 } else if (spec.flags & SPACE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 sign = ' ';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100447 spec.field_width--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 }
449 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700450 if (need_pfx) {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100451 spec.field_width--;
452 if (spec.base == 16)
453 spec.field_width--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700455
456 /* generate full string in tmp[], in reverse order */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 i = 0;
458 if (num == 0)
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700459 tmp[i++] = '0';
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700460 /* Generic code, for any base:
461 else do {
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100462 tmp[i++] = (digits[do_div(num,base)] | locase);
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700463 } while (num != 0);
464 */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100465 else if (spec.base != 10) { /* 8 or 16 */
466 int mask = spec.base - 1;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700467 int shift = 3;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800468
469 if (spec.base == 16)
470 shift = 4;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700471 do {
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100472 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700473 num >>= shift;
474 } while (num);
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700475 } else { /* base 10 */
476 i = put_dec(tmp, num) - tmp;
477 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700478
479 /* printing 100 using %2d gives "100", not "00" */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100480 if (i > spec.precision)
481 spec.precision = i;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700482 /* leading space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100483 spec.field_width -= spec.precision;
484 if (!(spec.flags & (ZEROPAD+LEFT))) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800485 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700486 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 *buf = ' ';
488 ++buf;
489 }
490 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700491 /* sign */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 if (sign) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700493 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 *buf = sign;
495 ++buf;
496 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700497 /* "0x" / "0" prefix */
498 if (need_pfx) {
499 if (buf < end)
500 *buf = '0';
501 ++buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100502 if (spec.base == 16) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700503 if (buf < end)
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100504 *buf = ('X' | locase);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 ++buf;
506 }
507 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700508 /* zero or space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100509 if (!(spec.flags & LEFT)) {
510 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
511 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700512 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 *buf = c;
514 ++buf;
515 }
516 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700517 /* hmm even more zero padding? */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100518 while (i <= --spec.precision) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700519 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 *buf = '0';
521 ++buf;
522 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700523 /* actual digits of result */
524 while (--i >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700525 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 *buf = tmp[i];
527 ++buf;
528 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700529 /* trailing space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100530 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700531 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 *buf = ' ';
533 ++buf;
534 }
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800535
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 return buf;
537}
538
Joe Perchescf3b4292010-05-24 14:33:16 -0700539static noinline_for_stack
540char *string(char *buf, char *end, const char *s, struct printf_spec spec)
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700541{
542 int len, i;
543
544 if ((unsigned long)s < PAGE_SIZE)
André Goddard Rosa0f4f81d2009-12-14 18:00:55 -0800545 s = "(null)";
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700546
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100547 len = strnlen(s, spec.precision);
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700548
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100549 if (!(spec.flags & LEFT)) {
550 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700551 if (buf < end)
552 *buf = ' ';
553 ++buf;
554 }
555 }
556 for (i = 0; i < len; ++i) {
557 if (buf < end)
558 *buf = *s;
559 ++buf; ++s;
560 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100561 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700562 if (buf < end)
563 *buf = ' ';
564 ++buf;
565 }
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800566
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700567 return buf;
568}
569
Joe Perchescf3b4292010-05-24 14:33:16 -0700570static noinline_for_stack
571char *symbol_string(char *buf, char *end, void *ptr,
572 struct printf_spec spec, char ext)
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700573{
574 unsigned long value = (unsigned long) ptr;
575#ifdef CONFIG_KALLSYMS
576 char sym[KSYM_SYMBOL_LEN];
Steven Rostedt91adcd22009-09-16 20:03:06 -0400577 if (ext != 'f' && ext != 's')
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200578 sprint_symbol(sym, value);
579 else
580 kallsyms_lookup(value, NULL, NULL, NULL, sym);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800581
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100582 return string(buf, end, sym, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700583#else
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800584 spec.field_width = 2 * sizeof(void *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100585 spec.flags |= SPECIAL | SMALL | ZEROPAD;
586 spec.base = 16;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800587
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100588 return number(buf, end, value, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700589#endif
590}
591
Joe Perchescf3b4292010-05-24 14:33:16 -0700592static noinline_for_stack
593char *resource_string(char *buf, char *end, struct resource *res,
594 struct printf_spec spec, const char *fmt)
Linus Torvalds332d2e72008-10-20 15:07:34 +1100595{
596#ifndef IO_RSRC_PRINTK_SIZE
Bjorn Helgaas28405372009-10-06 15:33:29 -0600597#define IO_RSRC_PRINTK_SIZE 6
Linus Torvalds332d2e72008-10-20 15:07:34 +1100598#endif
599
600#ifndef MEM_RSRC_PRINTK_SIZE
Bjorn Helgaas28405372009-10-06 15:33:29 -0600601#define MEM_RSRC_PRINTK_SIZE 10
Linus Torvalds332d2e72008-10-20 15:07:34 +1100602#endif
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700603 static const struct printf_spec io_spec = {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100604 .base = 16,
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700605 .field_width = IO_RSRC_PRINTK_SIZE,
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100606 .precision = -1,
607 .flags = SPECIAL | SMALL | ZEROPAD,
608 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700609 static const struct printf_spec mem_spec = {
610 .base = 16,
611 .field_width = MEM_RSRC_PRINTK_SIZE,
612 .precision = -1,
613 .flags = SPECIAL | SMALL | ZEROPAD,
614 };
Bjorn Helgaas0f4050c2010-03-05 10:47:42 -0700615 static const struct printf_spec bus_spec = {
616 .base = 16,
617 .field_width = 2,
618 .precision = -1,
619 .flags = SMALL | ZEROPAD,
620 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700621 static const struct printf_spec dec_spec = {
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600622 .base = 10,
623 .precision = -1,
624 .flags = 0,
625 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700626 static const struct printf_spec str_spec = {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600627 .field_width = -1,
628 .precision = 10,
629 .flags = LEFT,
630 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700631 static const struct printf_spec flag_spec = {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600632 .base = 16,
633 .precision = -1,
634 .flags = SPECIAL | SMALL,
635 };
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600636
637 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
638 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
639#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
640#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
Bjorn Helgaas9d7cca02010-03-05 10:47:47 -0700641#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600642#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
643 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
644 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
645
Linus Torvalds332d2e72008-10-20 15:07:34 +1100646 char *p = sym, *pend = sym + sizeof(sym);
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600647 int decode = (fmt[0] == 'R') ? 1 : 0;
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700648 const struct printf_spec *specp;
Linus Torvalds332d2e72008-10-20 15:07:34 +1100649
650 *p++ = '[';
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700651 if (res->flags & IORESOURCE_IO) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600652 p = string(p, pend, "io ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700653 specp = &io_spec;
654 } else if (res->flags & IORESOURCE_MEM) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600655 p = string(p, pend, "mem ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700656 specp = &mem_spec;
657 } else if (res->flags & IORESOURCE_IRQ) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600658 p = string(p, pend, "irq ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700659 specp = &dec_spec;
660 } else if (res->flags & IORESOURCE_DMA) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600661 p = string(p, pend, "dma ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700662 specp = &dec_spec;
Bjorn Helgaas0f4050c2010-03-05 10:47:42 -0700663 } else if (res->flags & IORESOURCE_BUS) {
664 p = string(p, pend, "bus ", str_spec);
665 specp = &bus_spec;
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700666 } else {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600667 p = string(p, pend, "??? ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700668 specp = &mem_spec;
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600669 decode = 0;
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600670 }
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700671 p = number(p, pend, res->start, *specp);
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600672 if (res->start != res->end) {
673 *p++ = '-';
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700674 p = number(p, pend, res->end, *specp);
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600675 }
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600676 if (decode) {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600677 if (res->flags & IORESOURCE_MEM_64)
678 p = string(p, pend, " 64bit", str_spec);
679 if (res->flags & IORESOURCE_PREFETCH)
680 p = string(p, pend, " pref", str_spec);
Bjorn Helgaas9d7cca02010-03-05 10:47:47 -0700681 if (res->flags & IORESOURCE_WINDOW)
682 p = string(p, pend, " window", str_spec);
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600683 if (res->flags & IORESOURCE_DISABLED)
684 p = string(p, pend, " disabled", str_spec);
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600685 } else {
686 p = string(p, pend, " flags ", str_spec);
687 p = number(p, pend, res->flags, flag_spec);
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600688 }
Linus Torvalds332d2e72008-10-20 15:07:34 +1100689 *p++ = ']';
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600690 *p = '\0';
Linus Torvalds332d2e72008-10-20 15:07:34 +1100691
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100692 return string(buf, end, sym, spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100693}
694
Joe Perchescf3b4292010-05-24 14:33:16 -0700695static noinline_for_stack
696char *mac_address_string(char *buf, char *end, u8 *addr,
697 struct printf_spec spec, const char *fmt)
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700698{
Joe Perches8a27f7c2009-08-17 12:29:44 +0000699 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700700 char *p = mac_addr;
701 int i;
Joe Perchesbc7259a2010-01-07 11:43:50 +0000702 char separator;
703
704 if (fmt[1] == 'F') { /* FDDI canonical format */
Joe Perchesbc7259a2010-01-07 11:43:50 +0000705 separator = '-';
706 } else {
Joe Perchesbc7259a2010-01-07 11:43:50 +0000707 separator = ':';
708 }
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700709
710 for (i = 0; i < 6; i++) {
Joe Perchesc8e00062010-01-11 00:44:14 -0800711 p = pack_hex_byte(p, addr[i]);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000712 if (fmt[0] == 'M' && i != 5)
Joe Perchesbc7259a2010-01-07 11:43:50 +0000713 *p++ = separator;
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700714 }
715 *p = '\0';
716
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100717 return string(buf, end, mac_addr, spec);
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700718}
719
Joe Perchescf3b4292010-05-24 14:33:16 -0700720static noinline_for_stack
721char *ip4_string(char *p, const u8 *addr, const char *fmt)
Harvey Harrison689afa72008-10-28 16:04:44 -0700722{
Harvey Harrison689afa72008-10-28 16:04:44 -0700723 int i;
Joe Perches0159f242010-01-13 20:23:30 -0800724 bool leading_zeros = (fmt[0] == 'i');
725 int index;
726 int step;
Harvey Harrison689afa72008-10-28 16:04:44 -0700727
Joe Perches0159f242010-01-13 20:23:30 -0800728 switch (fmt[2]) {
729 case 'h':
730#ifdef __BIG_ENDIAN
731 index = 0;
732 step = 1;
733#else
734 index = 3;
735 step = -1;
736#endif
737 break;
738 case 'l':
739 index = 3;
740 step = -1;
741 break;
742 case 'n':
743 case 'b':
744 default:
745 index = 0;
746 step = 1;
747 break;
748 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000749 for (i = 0; i < 4; i++) {
750 char temp[3]; /* hold each IP quad in reverse order */
Joe Perches0159f242010-01-13 20:23:30 -0800751 int digits = put_dec_trunc(temp, addr[index]) - temp;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000752 if (leading_zeros) {
753 if (digits < 3)
754 *p++ = '0';
755 if (digits < 2)
756 *p++ = '0';
757 }
758 /* reverse the digits in the quad */
759 while (digits--)
760 *p++ = temp[digits];
761 if (i < 3)
762 *p++ = '.';
Joe Perches0159f242010-01-13 20:23:30 -0800763 index += step;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000764 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000765 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800766
Joe Perches8a27f7c2009-08-17 12:29:44 +0000767 return p;
768}
769
Joe Perchescf3b4292010-05-24 14:33:16 -0700770static noinline_for_stack
771char *ip6_compressed_string(char *p, const char *addr)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000772{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800773 int i, j, range;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000774 unsigned char zerolength[8];
775 int longest = 1;
776 int colonpos = -1;
777 u16 word;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800778 u8 hi, lo;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000779 bool needcolon = false;
Joe Percheseb78cd22009-09-18 13:04:06 +0000780 bool useIPv4;
781 struct in6_addr in6;
782
783 memcpy(&in6, addr, sizeof(struct in6_addr));
784
785 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000786
787 memset(zerolength, 0, sizeof(zerolength));
788
789 if (useIPv4)
790 range = 6;
791 else
792 range = 8;
793
794 /* find position of longest 0 run */
795 for (i = 0; i < range; i++) {
796 for (j = i; j < range; j++) {
Joe Percheseb78cd22009-09-18 13:04:06 +0000797 if (in6.s6_addr16[j] != 0)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000798 break;
799 zerolength[i]++;
800 }
801 }
802 for (i = 0; i < range; i++) {
803 if (zerolength[i] > longest) {
804 longest = zerolength[i];
805 colonpos = i;
806 }
807 }
808
809 /* emit address */
810 for (i = 0; i < range; i++) {
811 if (i == colonpos) {
812 if (needcolon || i == 0)
813 *p++ = ':';
814 *p++ = ':';
815 needcolon = false;
816 i += longest - 1;
817 continue;
818 }
819 if (needcolon) {
820 *p++ = ':';
821 needcolon = false;
822 }
823 /* hex u16 without leading 0s */
Joe Percheseb78cd22009-09-18 13:04:06 +0000824 word = ntohs(in6.s6_addr16[i]);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000825 hi = word >> 8;
826 lo = word & 0xff;
827 if (hi) {
828 if (hi > 0x0f)
829 p = pack_hex_byte(p, hi);
830 else
831 *p++ = hex_asc_lo(hi);
André Goddard Rosab5ff9922009-12-14 18:00:59 -0800832 p = pack_hex_byte(p, lo);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000833 }
André Goddard Rosab5ff9922009-12-14 18:00:59 -0800834 else if (lo > 0x0f)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000835 p = pack_hex_byte(p, lo);
836 else
837 *p++ = hex_asc_lo(lo);
838 needcolon = true;
839 }
840
841 if (useIPv4) {
842 if (needcolon)
843 *p++ = ':';
Joe Perches0159f242010-01-13 20:23:30 -0800844 p = ip4_string(p, &in6.s6_addr[12], "I4");
Joe Perches8a27f7c2009-08-17 12:29:44 +0000845 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000846 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800847
Joe Perches8a27f7c2009-08-17 12:29:44 +0000848 return p;
849}
850
Joe Perchescf3b4292010-05-24 14:33:16 -0700851static noinline_for_stack
852char *ip6_string(char *p, const char *addr, const char *fmt)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000853{
854 int i;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800855
Harvey Harrison689afa72008-10-28 16:04:44 -0700856 for (i = 0; i < 8; i++) {
Joe Percheseb78cd22009-09-18 13:04:06 +0000857 p = pack_hex_byte(p, *addr++);
858 p = pack_hex_byte(p, *addr++);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000859 if (fmt[0] == 'I' && i != 7)
Harvey Harrison689afa72008-10-28 16:04:44 -0700860 *p++ = ':';
861 }
862 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800863
Joe Perches8a27f7c2009-08-17 12:29:44 +0000864 return p;
865}
866
Joe Perchescf3b4292010-05-24 14:33:16 -0700867static noinline_for_stack
868char *ip6_addr_string(char *buf, char *end, const u8 *addr,
869 struct printf_spec spec, const char *fmt)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000870{
871 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
872
873 if (fmt[0] == 'I' && fmt[2] == 'c')
Joe Percheseb78cd22009-09-18 13:04:06 +0000874 ip6_compressed_string(ip6_addr, addr);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000875 else
Joe Percheseb78cd22009-09-18 13:04:06 +0000876 ip6_string(ip6_addr, addr, fmt);
Harvey Harrison689afa72008-10-28 16:04:44 -0700877
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100878 return string(buf, end, ip6_addr, spec);
Harvey Harrison689afa72008-10-28 16:04:44 -0700879}
880
Joe Perchescf3b4292010-05-24 14:33:16 -0700881static noinline_for_stack
882char *ip4_addr_string(char *buf, char *end, const u8 *addr,
883 struct printf_spec spec, const char *fmt)
Harvey Harrison4aa99602008-10-29 12:49:58 -0700884{
Joe Perches8a27f7c2009-08-17 12:29:44 +0000885 char ip4_addr[sizeof("255.255.255.255")];
Harvey Harrison4aa99602008-10-29 12:49:58 -0700886
Joe Perches0159f242010-01-13 20:23:30 -0800887 ip4_string(ip4_addr, addr, fmt);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700888
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100889 return string(buf, end, ip4_addr, spec);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700890}
891
Joe Perchescf3b4292010-05-24 14:33:16 -0700892static noinline_for_stack
893char *uuid_string(char *buf, char *end, const u8 *addr,
894 struct printf_spec spec, const char *fmt)
Joe Perches9ac6e442009-12-14 18:01:09 -0800895{
896 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
897 char *p = uuid;
898 int i;
899 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
900 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
901 const u8 *index = be;
902 bool uc = false;
903
904 switch (*(++fmt)) {
905 case 'L':
906 uc = true; /* fall-through */
907 case 'l':
908 index = le;
909 break;
910 case 'B':
911 uc = true;
912 break;
913 }
914
915 for (i = 0; i < 16; i++) {
916 p = pack_hex_byte(p, addr[index[i]]);
917 switch (i) {
918 case 3:
919 case 5:
920 case 7:
921 case 9:
922 *p++ = '-';
923 break;
924 }
925 }
926
927 *p = 0;
928
929 if (uc) {
930 p = uuid;
931 do {
932 *p = toupper(*p);
933 } while (*(++p));
934 }
935
936 return string(buf, end, uuid, spec);
937}
938
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700939/*
940 * Show a '%p' thing. A kernel extension is that the '%p' is followed
941 * by an extra set of alphanumeric characters that are extended format
942 * specifiers.
943 *
Linus Torvalds332d2e72008-10-20 15:07:34 +1100944 * Right now we handle:
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700945 *
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200946 * - 'F' For symbolic function descriptor pointers with offset
947 * - 'f' For simple symbolic function names without offset
Steven Rostedt0efb4d22009-09-17 09:27:29 -0400948 * - 'S' For symbolic direct pointers with offset
949 * - 's' For symbolic direct pointers without offset
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600950 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
951 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700952 * - 'M' For a 6-byte MAC address, it prints the address in the
953 * usual colon-separated hex notation
Joe Perches8a27f7c2009-08-17 12:29:44 +0000954 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
Joe Perchesbc7259a2010-01-07 11:43:50 +0000955 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
Joe Perchesc8e00062010-01-11 00:44:14 -0800956 * with a dash-separated hex notation
Joe Perches8a27f7c2009-08-17 12:29:44 +0000957 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
958 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
959 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
960 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
961 * IPv6 omits the colons (01020304...0f)
962 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
Joe Perches0159f242010-01-13 20:23:30 -0800963 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
Joe Perches8a27f7c2009-08-17 12:29:44 +0000964 * - 'I6c' for IPv6 addresses printed as specified by
Uwe Kleine-König3f472402010-01-08 14:43:02 -0800965 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
Joe Perches9ac6e442009-12-14 18:01:09 -0800966 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
967 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
968 * Options for %pU are:
969 * b big endian lower case hex (default)
970 * B big endian UPPER case hex
971 * l little endian lower case hex
972 * L little endian UPPER case hex
973 * big endian output byte order is:
974 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
975 * little endian output byte order is:
976 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
Joe Perches7db6f5f2010-06-27 01:02:33 +0000977 * - 'V' For a struct va_format which contains a format string * and va_list *,
978 * call vsnprintf(->format, *->va_list).
979 * Implements a "recursive vsnprintf".
980 * Do not use this feature without some mechanism to verify the
981 * correctness of the format string and va_list arguments.
Joe Perches9ac6e442009-12-14 18:01:09 -0800982 *
Linus Torvalds332d2e72008-10-20 15:07:34 +1100983 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
984 * function pointers are really function descriptors, which contain a
985 * pointer to the real address.
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700986 */
Joe Perchescf3b4292010-05-24 14:33:16 -0700987static noinline_for_stack
988char *pointer(const char *fmt, char *buf, char *end, void *ptr,
989 struct printf_spec spec)
Linus Torvalds78a8bf62008-07-06 16:16:15 -0700990{
Joe Perches5e057982010-10-26 14:22:50 -0700991 if (!ptr) {
992 /*
993 * Print (null) with the same width as a pointer so it makes
994 * tabular output look nice.
995 */
996 if (spec.field_width == -1)
997 spec.field_width = 2 * sizeof(void *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100998 return string(buf, end, "(null)", spec);
Joe Perches5e057982010-10-26 14:22:50 -0700999 }
Linus Torvaldsd97106a2009-01-03 11:46:17 -08001000
Linus Torvalds0fe1ef22008-07-06 16:43:12 -07001001 switch (*fmt) {
1002 case 'F':
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001003 case 'f':
Linus Torvalds0fe1ef22008-07-06 16:43:12 -07001004 ptr = dereference_function_descriptor(ptr);
1005 /* Fallthrough */
1006 case 'S':
Joe Perches9ac6e442009-12-14 18:01:09 -08001007 case 's':
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001008 return symbol_string(buf, end, ptr, spec, *fmt);
Linus Torvalds332d2e72008-10-20 15:07:34 +11001009 case 'R':
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -06001010 case 'r':
Bjorn Helgaasfd955412009-10-06 15:33:39 -06001011 return resource_string(buf, end, ptr, spec, fmt);
Joe Perches8a27f7c2009-08-17 12:29:44 +00001012 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1013 case 'm': /* Contiguous: 000102030405 */
Joe Perchesbc7259a2010-01-07 11:43:50 +00001014 /* [mM]F (FDDI, bit reversed) */
Joe Perches8a27f7c2009-08-17 12:29:44 +00001015 return mac_address_string(buf, end, ptr, spec, fmt);
1016 case 'I': /* Formatted IP supported
1017 * 4: 1.2.3.4
1018 * 6: 0001:0203:...:0708
1019 * 6c: 1::708 or 1::1.2.3.4
1020 */
1021 case 'i': /* Contiguous:
1022 * 4: 001.002.003.004
1023 * 6: 000102...0f
1024 */
1025 switch (fmt[1]) {
1026 case '6':
1027 return ip6_addr_string(buf, end, ptr, spec, fmt);
1028 case '4':
1029 return ip4_addr_string(buf, end, ptr, spec, fmt);
1030 }
Harvey Harrison4aa99602008-10-29 12:49:58 -07001031 break;
Joe Perches9ac6e442009-12-14 18:01:09 -08001032 case 'U':
1033 return uuid_string(buf, end, ptr, spec, fmt);
Joe Perches7db6f5f2010-06-27 01:02:33 +00001034 case 'V':
1035 return buf + vsnprintf(buf, end - buf,
1036 ((struct va_format *)ptr)->fmt,
1037 *(((struct va_format *)ptr)->va));
Linus Torvalds0fe1ef22008-07-06 16:43:12 -07001038 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001039 spec.flags |= SMALL;
1040 if (spec.field_width == -1) {
Joe Perches5e057982010-10-26 14:22:50 -07001041 spec.field_width = 2 * sizeof(void *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001042 spec.flags |= ZEROPAD;
Linus Torvalds78a8bf62008-07-06 16:16:15 -07001043 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001044 spec.base = 16;
1045
1046 return number(buf, end, (unsigned long) ptr, spec);
1047}
1048
1049/*
1050 * Helper function to decode printf style format.
1051 * Each call decode a token from the format and return the
1052 * number of characters read (or likely the delta where it wants
1053 * to go on the next call).
1054 * The decoded token is returned through the parameters
1055 *
1056 * 'h', 'l', or 'L' for integer fields
1057 * 'z' support added 23/7/1999 S.H.
1058 * 'z' changed to 'Z' --davidm 1/25/99
1059 * 't' added for ptrdiff_t
1060 *
1061 * @fmt: the format string
1062 * @type of the token returned
1063 * @flags: various flags such as +, -, # tokens..
1064 * @field_width: overwritten width
1065 * @base: base of the number (octal, hex, ...)
1066 * @precision: precision of a number
1067 * @qualifier: qualifier of a number (long, size_t, ...)
1068 */
Joe Perchescf3b4292010-05-24 14:33:16 -07001069static noinline_for_stack
1070int format_decode(const char *fmt, struct printf_spec *spec)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001071{
1072 const char *start = fmt;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001073
1074 /* we finished early by reading the field width */
Vegard Nossumed681a92009-03-14 12:08:50 +01001075 if (spec->type == FORMAT_TYPE_WIDTH) {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001076 if (spec->field_width < 0) {
1077 spec->field_width = -spec->field_width;
1078 spec->flags |= LEFT;
1079 }
1080 spec->type = FORMAT_TYPE_NONE;
1081 goto precision;
1082 }
1083
1084 /* we finished early by reading the precision */
1085 if (spec->type == FORMAT_TYPE_PRECISION) {
1086 if (spec->precision < 0)
1087 spec->precision = 0;
1088
1089 spec->type = FORMAT_TYPE_NONE;
1090 goto qualifier;
1091 }
1092
1093 /* By default */
1094 spec->type = FORMAT_TYPE_NONE;
1095
1096 for (; *fmt ; ++fmt) {
1097 if (*fmt == '%')
1098 break;
1099 }
1100
1101 /* Return the current non-format string */
1102 if (fmt != start || !*fmt)
1103 return fmt - start;
1104
1105 /* Process flags */
1106 spec->flags = 0;
1107
1108 while (1) { /* this also skips first '%' */
1109 bool found = true;
1110
1111 ++fmt;
1112
1113 switch (*fmt) {
1114 case '-': spec->flags |= LEFT; break;
1115 case '+': spec->flags |= PLUS; break;
1116 case ' ': spec->flags |= SPACE; break;
1117 case '#': spec->flags |= SPECIAL; break;
1118 case '0': spec->flags |= ZEROPAD; break;
1119 default: found = false;
1120 }
1121
1122 if (!found)
1123 break;
1124 }
1125
1126 /* get field width */
1127 spec->field_width = -1;
1128
1129 if (isdigit(*fmt))
1130 spec->field_width = skip_atoi(&fmt);
1131 else if (*fmt == '*') {
1132 /* it's the next argument */
Vegard Nossumed681a92009-03-14 12:08:50 +01001133 spec->type = FORMAT_TYPE_WIDTH;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001134 return ++fmt - start;
1135 }
1136
1137precision:
1138 /* get the precision */
1139 spec->precision = -1;
1140 if (*fmt == '.') {
1141 ++fmt;
1142 if (isdigit(*fmt)) {
1143 spec->precision = skip_atoi(&fmt);
1144 if (spec->precision < 0)
1145 spec->precision = 0;
1146 } else if (*fmt == '*') {
1147 /* it's the next argument */
Vegard Nossumadf26f82009-03-14 12:08:50 +01001148 spec->type = FORMAT_TYPE_PRECISION;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001149 return ++fmt - start;
1150 }
1151 }
1152
1153qualifier:
1154 /* get the conversion qualifier */
1155 spec->qualifier = -1;
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001156 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1157 TOLOWER(*fmt) == 'z' || *fmt == 't') {
Zhaoleia4e94ef2009-03-27 17:07:05 +08001158 spec->qualifier = *fmt++;
1159 if (unlikely(spec->qualifier == *fmt)) {
1160 if (spec->qualifier == 'l') {
1161 spec->qualifier = 'L';
1162 ++fmt;
1163 } else if (spec->qualifier == 'h') {
1164 spec->qualifier = 'H';
1165 ++fmt;
1166 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001167 }
1168 }
1169
1170 /* default base */
1171 spec->base = 10;
1172 switch (*fmt) {
1173 case 'c':
1174 spec->type = FORMAT_TYPE_CHAR;
1175 return ++fmt - start;
1176
1177 case 's':
1178 spec->type = FORMAT_TYPE_STR;
1179 return ++fmt - start;
1180
1181 case 'p':
1182 spec->type = FORMAT_TYPE_PTR;
1183 return fmt - start;
1184 /* skip alnum */
1185
1186 case 'n':
1187 spec->type = FORMAT_TYPE_NRCHARS;
1188 return ++fmt - start;
1189
1190 case '%':
1191 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1192 return ++fmt - start;
1193
1194 /* integer number formats - set up the flags and "break" */
1195 case 'o':
1196 spec->base = 8;
1197 break;
1198
1199 case 'x':
1200 spec->flags |= SMALL;
1201
1202 case 'X':
1203 spec->base = 16;
1204 break;
1205
1206 case 'd':
1207 case 'i':
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001208 spec->flags |= SIGN;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001209 case 'u':
1210 break;
1211
1212 default:
1213 spec->type = FORMAT_TYPE_INVALID;
1214 return fmt - start;
1215 }
1216
1217 if (spec->qualifier == 'L')
1218 spec->type = FORMAT_TYPE_LONG_LONG;
1219 else if (spec->qualifier == 'l') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001220 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001221 spec->type = FORMAT_TYPE_LONG;
1222 else
1223 spec->type = FORMAT_TYPE_ULONG;
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001224 } else if (TOLOWER(spec->qualifier) == 'z') {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001225 spec->type = FORMAT_TYPE_SIZE_T;
1226 } else if (spec->qualifier == 't') {
1227 spec->type = FORMAT_TYPE_PTRDIFF;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001228 } else if (spec->qualifier == 'H') {
1229 if (spec->flags & SIGN)
1230 spec->type = FORMAT_TYPE_BYTE;
1231 else
1232 spec->type = FORMAT_TYPE_UBYTE;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001233 } else if (spec->qualifier == 'h') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001234 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001235 spec->type = FORMAT_TYPE_SHORT;
1236 else
1237 spec->type = FORMAT_TYPE_USHORT;
1238 } else {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001239 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001240 spec->type = FORMAT_TYPE_INT;
1241 else
1242 spec->type = FORMAT_TYPE_UINT;
1243 }
1244
1245 return ++fmt - start;
Linus Torvalds78a8bf62008-07-06 16:16:15 -07001246}
1247
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248/**
1249 * vsnprintf - Format a string and place it in a buffer
1250 * @buf: The buffer to place the result into
1251 * @size: The size of the buffer, including the trailing null space
1252 * @fmt: The format string to use
1253 * @args: Arguments for the format string
1254 *
Andi Kleen20036fd2008-10-15 22:02:02 -07001255 * This function follows C99 vsnprintf, but has some extensions:
Steven Rostedt91adcd22009-09-16 20:03:06 -04001256 * %pS output the name of a text symbol with offset
1257 * %ps output the name of a text symbol without offset
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001258 * %pF output the name of a function pointer with its offset
1259 * %pf output the name of a function pointer without its offset
Uwe Kleine-König8a795032009-12-17 15:27:12 -08001260 * %pR output the address range in a struct resource with decoded flags
1261 * %pr output the address range in a struct resource with raw flags
1262 * %pM output a 6-byte MAC address with colons
1263 * %pm output a 6-byte MAC address without colons
1264 * %pI4 print an IPv4 address without leading zeros
1265 * %pi4 print an IPv4 address with leading zeros
1266 * %pI6 print an IPv6 address with colons
1267 * %pi6 print an IPv6 address without colons
1268 * %pI6c print an IPv6 address as specified by
Uwe Kleine-König3f472402010-01-08 14:43:02 -08001269 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
Uwe Kleine-König8a795032009-12-17 15:27:12 -08001270 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1271 * case.
Steven Rostedt0efb4d22009-09-17 09:27:29 -04001272 * %n is ignored
Andi Kleen20036fd2008-10-15 22:02:02 -07001273 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 * The return value is the number of characters which would
1275 * be generated for the given input, excluding the trailing
1276 * '\0', as per ISO C99. If you want to have the exact
1277 * number of characters written into @buf as return value
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001278 * (not including the trailing '\0'), use vscnprintf(). If the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 * return is greater than or equal to @size, the resulting
1280 * string is truncated.
1281 *
1282 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001283 * You probably want snprintf() instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 */
1285int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1286{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 unsigned long long num;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001288 char *str, *end;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001289 struct printf_spec spec = {0};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001291 /* Reject out-of-range values early. Large positive sizes are
1292 used for unknown buffer sizes. */
Marcin Slusarz2f30b1f92009-09-21 17:04:29 -07001293 if (WARN_ON_ONCE((int) size < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295
1296 str = buf;
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001297 end = buf + size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001299 /* Make sure end is always >= buf */
1300 if (end < buf) {
1301 end = ((void *)-1);
1302 size = end - buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 }
1304
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001305 while (*fmt) {
1306 const char *old_fmt = fmt;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001307 int read = format_decode(fmt, &spec);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001308
1309 fmt += read;
1310
1311 switch (spec.type) {
1312 case FORMAT_TYPE_NONE: {
1313 int copy = read;
1314 if (str < end) {
1315 if (copy > end - str)
1316 copy = end - str;
1317 memcpy(str, old_fmt, copy);
1318 }
1319 str += read;
1320 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 }
1322
Vegard Nossumed681a92009-03-14 12:08:50 +01001323 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001324 spec.field_width = va_arg(args, int);
1325 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001327 case FORMAT_TYPE_PRECISION:
1328 spec.precision = va_arg(args, int);
1329 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330
André Goddard Rosad4be1512009-12-14 18:00:59 -08001331 case FORMAT_TYPE_CHAR: {
1332 char c;
1333
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001334 if (!(spec.flags & LEFT)) {
1335 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001336 if (str < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 *str = ' ';
1338 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001339
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001341 }
1342 c = (unsigned char) va_arg(args, int);
1343 if (str < end)
1344 *str = c;
1345 ++str;
1346 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001347 if (str < end)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001348 *str = ' ';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001350 }
1351 break;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001352 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001354 case FORMAT_TYPE_STR:
1355 str = string(str, end, va_arg(args, char *), spec);
1356 break;
1357
1358 case FORMAT_TYPE_PTR:
1359 str = pointer(fmt+1, str, end, va_arg(args, void *),
1360 spec);
1361 while (isalnum(*fmt))
1362 fmt++;
1363 break;
1364
1365 case FORMAT_TYPE_PERCENT_CHAR:
1366 if (str < end)
1367 *str = '%';
1368 ++str;
1369 break;
1370
1371 case FORMAT_TYPE_INVALID:
1372 if (str < end)
1373 *str = '%';
1374 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001375 break;
1376
1377 case FORMAT_TYPE_NRCHARS: {
Joe Perchesef0658f2010-03-06 17:10:14 -08001378 u8 qualifier = spec.qualifier;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001379
1380 if (qualifier == 'l') {
1381 long *ip = va_arg(args, long *);
1382 *ip = (str - buf);
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001383 } else if (TOLOWER(qualifier) == 'z') {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001384 size_t *ip = va_arg(args, size_t *);
1385 *ip = (str - buf);
1386 } else {
1387 int *ip = va_arg(args, int *);
1388 *ip = (str - buf);
1389 }
1390 break;
1391 }
1392
1393 default:
1394 switch (spec.type) {
1395 case FORMAT_TYPE_LONG_LONG:
1396 num = va_arg(args, long long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001398 case FORMAT_TYPE_ULONG:
1399 num = va_arg(args, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001401 case FORMAT_TYPE_LONG:
1402 num = va_arg(args, long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001404 case FORMAT_TYPE_SIZE_T:
1405 num = va_arg(args, size_t);
1406 break;
1407 case FORMAT_TYPE_PTRDIFF:
1408 num = va_arg(args, ptrdiff_t);
1409 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001410 case FORMAT_TYPE_UBYTE:
1411 num = (unsigned char) va_arg(args, int);
1412 break;
1413 case FORMAT_TYPE_BYTE:
1414 num = (signed char) va_arg(args, int);
1415 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001416 case FORMAT_TYPE_USHORT:
1417 num = (unsigned short) va_arg(args, int);
1418 break;
1419 case FORMAT_TYPE_SHORT:
1420 num = (short) va_arg(args, int);
1421 break;
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001422 case FORMAT_TYPE_INT:
1423 num = (int) va_arg(args, int);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001424 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 default:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001426 num = va_arg(args, unsigned int);
1427 }
1428
1429 str = number(str, end, num, spec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001432
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001433 if (size > 0) {
1434 if (str < end)
1435 *str = '\0';
1436 else
Linus Torvalds0a6047e2006-06-28 17:09:34 -07001437 end[-1] = '\0';
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001438 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001439
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001440 /* the trailing null byte doesn't count towards the total */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 return str-buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001442
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444EXPORT_SYMBOL(vsnprintf);
1445
1446/**
1447 * vscnprintf - Format a string and place it in a buffer
1448 * @buf: The buffer to place the result into
1449 * @size: The size of the buffer, including the trailing null space
1450 * @fmt: The format string to use
1451 * @args: Arguments for the format string
1452 *
1453 * The return value is the number of characters which have been written into
1454 * the @buf not including the trailing '\0'. If @size is <= 0 the function
1455 * returns 0.
1456 *
1457 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001458 * You probably want scnprintf() instead.
Andi Kleen20036fd2008-10-15 22:02:02 -07001459 *
1460 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 */
1462int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1463{
1464 int i;
1465
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001466 i = vsnprintf(buf, size, fmt, args);
1467
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 return (i >= size) ? (size - 1) : i;
1469}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470EXPORT_SYMBOL(vscnprintf);
1471
1472/**
1473 * snprintf - Format a string and place it in a buffer
1474 * @buf: The buffer to place the result into
1475 * @size: The size of the buffer, including the trailing null space
1476 * @fmt: The format string to use
1477 * @...: Arguments for the format string
1478 *
1479 * The return value is the number of characters which would be
1480 * generated for the given input, excluding the trailing null,
1481 * as per ISO C99. If the return is greater than or equal to
1482 * @size, the resulting string is truncated.
Andi Kleen20036fd2008-10-15 22:02:02 -07001483 *
1484 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001486int snprintf(char *buf, size_t size, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487{
1488 va_list args;
1489 int i;
1490
1491 va_start(args, fmt);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001492 i = vsnprintf(buf, size, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001494
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 return i;
1496}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497EXPORT_SYMBOL(snprintf);
1498
1499/**
1500 * scnprintf - Format a string and place it in a buffer
1501 * @buf: The buffer to place the result into
1502 * @size: The size of the buffer, including the trailing null space
1503 * @fmt: The format string to use
1504 * @...: Arguments for the format string
1505 *
1506 * The return value is the number of characters written into @buf not including
Martin Peschkeea6f3282007-02-12 00:51:56 -08001507 * the trailing '\0'. If @size is <= 0 the function returns 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 */
1509
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001510int scnprintf(char *buf, size_t size, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511{
1512 va_list args;
1513 int i;
1514
1515 va_start(args, fmt);
1516 i = vsnprintf(buf, size, fmt, args);
1517 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001518
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 return (i >= size) ? (size - 1) : i;
1520}
1521EXPORT_SYMBOL(scnprintf);
1522
1523/**
1524 * vsprintf - Format a string and place it in a buffer
1525 * @buf: The buffer to place the result into
1526 * @fmt: The format string to use
1527 * @args: Arguments for the format string
1528 *
1529 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001530 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 * buffer overflows.
1532 *
1533 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001534 * You probably want sprintf() instead.
Andi Kleen20036fd2008-10-15 22:02:02 -07001535 *
1536 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 */
1538int vsprintf(char *buf, const char *fmt, va_list args)
1539{
1540 return vsnprintf(buf, INT_MAX, fmt, args);
1541}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542EXPORT_SYMBOL(vsprintf);
1543
1544/**
1545 * sprintf - Format a string and place it in a buffer
1546 * @buf: The buffer to place the result into
1547 * @fmt: The format string to use
1548 * @...: Arguments for the format string
1549 *
1550 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001551 * into @buf. Use snprintf() or scnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552 * buffer overflows.
Andi Kleen20036fd2008-10-15 22:02:02 -07001553 *
1554 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001556int sprintf(char *buf, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557{
1558 va_list args;
1559 int i;
1560
1561 va_start(args, fmt);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001562 i = vsnprintf(buf, INT_MAX, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001564
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 return i;
1566}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567EXPORT_SYMBOL(sprintf);
1568
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001569#ifdef CONFIG_BINARY_PRINTF
1570/*
1571 * bprintf service:
1572 * vbin_printf() - VA arguments to binary data
1573 * bstr_printf() - Binary data to text string
1574 */
1575
1576/**
1577 * vbin_printf - Parse a format string and place args' binary value in a buffer
1578 * @bin_buf: The buffer to place args' binary value
1579 * @size: The size of the buffer(by words(32bits), not characters)
1580 * @fmt: The format string to use
1581 * @args: Arguments for the format string
1582 *
1583 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1584 * is skiped.
1585 *
1586 * The return value is the number of words(32bits) which would be generated for
1587 * the given input.
1588 *
1589 * NOTE:
1590 * If the return value is greater than @size, the resulting bin_buf is NOT
1591 * valid for bstr_printf().
1592 */
1593int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1594{
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001595 struct printf_spec spec = {0};
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001596 char *str, *end;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001597
1598 str = (char *)bin_buf;
1599 end = (char *)(bin_buf + size);
1600
1601#define save_arg(type) \
1602do { \
1603 if (sizeof(type) == 8) { \
1604 unsigned long long value; \
1605 str = PTR_ALIGN(str, sizeof(u32)); \
1606 value = va_arg(args, unsigned long long); \
1607 if (str + sizeof(type) <= end) { \
1608 *(u32 *)str = *(u32 *)&value; \
1609 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1610 } \
1611 } else { \
1612 unsigned long value; \
1613 str = PTR_ALIGN(str, sizeof(type)); \
1614 value = va_arg(args, int); \
1615 if (str + sizeof(type) <= end) \
1616 *(typeof(type) *)str = (type)value; \
1617 } \
1618 str += sizeof(type); \
1619} while (0)
1620
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001621 while (*fmt) {
André Goddard Rosad4be1512009-12-14 18:00:59 -08001622 int read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001623
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001624 fmt += read;
1625
1626 switch (spec.type) {
1627 case FORMAT_TYPE_NONE:
André Goddard Rosad4be1512009-12-14 18:00:59 -08001628 case FORMAT_TYPE_INVALID:
1629 case FORMAT_TYPE_PERCENT_CHAR:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001630 break;
1631
Vegard Nossumed681a92009-03-14 12:08:50 +01001632 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001633 case FORMAT_TYPE_PRECISION:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001634 save_arg(int);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001635 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001636
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001637 case FORMAT_TYPE_CHAR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001638 save_arg(char);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001639 break;
1640
1641 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001642 const char *save_str = va_arg(args, char *);
1643 size_t len;
André Goddard Rosa6c356632009-12-14 18:00:56 -08001644
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001645 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1646 || (unsigned long)save_str < PAGE_SIZE)
André Goddard Rosa0f4f81d2009-12-14 18:00:55 -08001647 save_str = "(null)";
André Goddard Rosa6c356632009-12-14 18:00:56 -08001648 len = strlen(save_str) + 1;
1649 if (str + len < end)
1650 memcpy(str, save_str, len);
1651 str += len;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001652 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001653 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001654
1655 case FORMAT_TYPE_PTR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001656 save_arg(void *);
1657 /* skip all alphanumeric pointer suffixes */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001658 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001659 fmt++;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001660 break;
1661
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001662 case FORMAT_TYPE_NRCHARS: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001663 /* skip %n 's argument */
Joe Perchesef0658f2010-03-06 17:10:14 -08001664 u8 qualifier = spec.qualifier;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001665 void *skip_arg;
1666 if (qualifier == 'l')
1667 skip_arg = va_arg(args, long *);
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001668 else if (TOLOWER(qualifier) == 'z')
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001669 skip_arg = va_arg(args, size_t *);
1670 else
1671 skip_arg = va_arg(args, int *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001672 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001673 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001674
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001675 default:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001676 switch (spec.type) {
1677
1678 case FORMAT_TYPE_LONG_LONG:
1679 save_arg(long long);
1680 break;
1681 case FORMAT_TYPE_ULONG:
1682 case FORMAT_TYPE_LONG:
1683 save_arg(unsigned long);
1684 break;
1685 case FORMAT_TYPE_SIZE_T:
1686 save_arg(size_t);
1687 break;
1688 case FORMAT_TYPE_PTRDIFF:
1689 save_arg(ptrdiff_t);
1690 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001691 case FORMAT_TYPE_UBYTE:
1692 case FORMAT_TYPE_BYTE:
1693 save_arg(char);
1694 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001695 case FORMAT_TYPE_USHORT:
1696 case FORMAT_TYPE_SHORT:
1697 save_arg(short);
1698 break;
1699 default:
1700 save_arg(int);
1701 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001702 }
1703 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001704
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001705 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001706#undef save_arg
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001707}
1708EXPORT_SYMBOL_GPL(vbin_printf);
1709
1710/**
1711 * bstr_printf - Format a string from binary arguments and place it in a buffer
1712 * @buf: The buffer to place the result into
1713 * @size: The size of the buffer, including the trailing null space
1714 * @fmt: The format string to use
1715 * @bin_buf: Binary arguments for the format string
1716 *
1717 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1718 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1719 * a binary buffer that generated by vbin_printf.
1720 *
1721 * The format follows C99 vsnprintf, but has some extensions:
Steven Rostedt0efb4d22009-09-17 09:27:29 -04001722 * see vsnprintf comment for details.
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001723 *
1724 * The return value is the number of characters which would
1725 * be generated for the given input, excluding the trailing
1726 * '\0', as per ISO C99. If you want to have the exact
1727 * number of characters written into @buf as return value
1728 * (not including the trailing '\0'), use vscnprintf(). If the
1729 * return is greater than or equal to @size, the resulting
1730 * string is truncated.
1731 */
1732int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1733{
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001734 struct printf_spec spec = {0};
André Goddard Rosad4be1512009-12-14 18:00:59 -08001735 char *str, *end;
1736 const char *args = (const char *)bin_buf;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001737
Marcin Slusarz2f30b1f92009-09-21 17:04:29 -07001738 if (WARN_ON_ONCE((int) size < 0))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001739 return 0;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001740
1741 str = buf;
1742 end = buf + size;
1743
1744#define get_arg(type) \
1745({ \
1746 typeof(type) value; \
1747 if (sizeof(type) == 8) { \
1748 args = PTR_ALIGN(args, sizeof(u32)); \
1749 *(u32 *)&value = *(u32 *)args; \
1750 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1751 } else { \
1752 args = PTR_ALIGN(args, sizeof(type)); \
1753 value = *(typeof(type) *)args; \
1754 } \
1755 args += sizeof(type); \
1756 value; \
1757})
1758
1759 /* Make sure end is always >= buf */
1760 if (end < buf) {
1761 end = ((void *)-1);
1762 size = end - buf;
1763 }
1764
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001765 while (*fmt) {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001766 const char *old_fmt = fmt;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001767 int read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001768
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001769 fmt += read;
1770
1771 switch (spec.type) {
1772 case FORMAT_TYPE_NONE: {
1773 int copy = read;
1774 if (str < end) {
1775 if (copy > end - str)
1776 copy = end - str;
1777 memcpy(str, old_fmt, copy);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001778 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001779 str += read;
1780 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001781 }
1782
Vegard Nossumed681a92009-03-14 12:08:50 +01001783 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001784 spec.field_width = get_arg(int);
1785 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001786
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001787 case FORMAT_TYPE_PRECISION:
1788 spec.precision = get_arg(int);
1789 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001790
André Goddard Rosad4be1512009-12-14 18:00:59 -08001791 case FORMAT_TYPE_CHAR: {
1792 char c;
1793
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001794 if (!(spec.flags & LEFT)) {
1795 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001796 if (str < end)
1797 *str = ' ';
1798 ++str;
1799 }
1800 }
1801 c = (unsigned char) get_arg(char);
1802 if (str < end)
1803 *str = c;
1804 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001805 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001806 if (str < end)
1807 *str = ' ';
1808 ++str;
1809 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001810 break;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001811 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001812
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001813 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001814 const char *str_arg = args;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001815 args += strlen(str_arg) + 1;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001816 str = string(str, end, (char *)str_arg, spec);
1817 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001818 }
1819
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001820 case FORMAT_TYPE_PTR:
1821 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1822 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001823 fmt++;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001824 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001825
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001826 case FORMAT_TYPE_PERCENT_CHAR:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001827 case FORMAT_TYPE_INVALID:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001828 if (str < end)
1829 *str = '%';
1830 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001831 break;
1832
1833 case FORMAT_TYPE_NRCHARS:
1834 /* skip */
1835 break;
1836
André Goddard Rosad4be1512009-12-14 18:00:59 -08001837 default: {
1838 unsigned long long num;
1839
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001840 switch (spec.type) {
1841
1842 case FORMAT_TYPE_LONG_LONG:
1843 num = get_arg(long long);
1844 break;
1845 case FORMAT_TYPE_ULONG:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001846 case FORMAT_TYPE_LONG:
1847 num = get_arg(unsigned long);
1848 break;
1849 case FORMAT_TYPE_SIZE_T:
1850 num = get_arg(size_t);
1851 break;
1852 case FORMAT_TYPE_PTRDIFF:
1853 num = get_arg(ptrdiff_t);
1854 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001855 case FORMAT_TYPE_UBYTE:
1856 num = get_arg(unsigned char);
1857 break;
1858 case FORMAT_TYPE_BYTE:
1859 num = get_arg(signed char);
1860 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001861 case FORMAT_TYPE_USHORT:
1862 num = get_arg(unsigned short);
1863 break;
1864 case FORMAT_TYPE_SHORT:
1865 num = get_arg(short);
1866 break;
1867 case FORMAT_TYPE_UINT:
1868 num = get_arg(unsigned int);
1869 break;
1870 default:
1871 num = get_arg(int);
1872 }
1873
1874 str = number(str, end, num, spec);
André Goddard Rosad4be1512009-12-14 18:00:59 -08001875 } /* default: */
1876 } /* switch(spec.type) */
1877 } /* while(*fmt) */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001878
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001879 if (size > 0) {
1880 if (str < end)
1881 *str = '\0';
1882 else
1883 end[-1] = '\0';
1884 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001885
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001886#undef get_arg
1887
1888 /* the trailing null byte doesn't count towards the total */
1889 return str - buf;
1890}
1891EXPORT_SYMBOL_GPL(bstr_printf);
1892
1893/**
1894 * bprintf - Parse a format string and place args' binary value in a buffer
1895 * @bin_buf: The buffer to place args' binary value
1896 * @size: The size of the buffer(by words(32bits), not characters)
1897 * @fmt: The format string to use
1898 * @...: Arguments for the format string
1899 *
1900 * The function returns the number of words(u32) written
1901 * into @bin_buf.
1902 */
1903int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1904{
1905 va_list args;
1906 int ret;
1907
1908 va_start(args, fmt);
1909 ret = vbin_printf(bin_buf, size, fmt, args);
1910 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001911
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001912 return ret;
1913}
1914EXPORT_SYMBOL_GPL(bprintf);
1915
1916#endif /* CONFIG_BINARY_PRINTF */
1917
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918/**
1919 * vsscanf - Unformat a buffer into a list of arguments
1920 * @buf: input buffer
1921 * @fmt: format of buffer
1922 * @args: arguments
1923 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001924int vsscanf(const char *buf, const char *fmt, va_list args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925{
1926 const char *str = buf;
1927 char *next;
1928 char digit;
1929 int num = 0;
Joe Perchesef0658f2010-03-06 17:10:14 -08001930 u8 qualifier;
1931 u8 base;
1932 s16 field_width;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001933 bool is_sign;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001935 while (*fmt && *str) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 /* skip any white space in format */
1937 /* white space in format matchs any amount of
1938 * white space, including none, in the input.
1939 */
1940 if (isspace(*fmt)) {
André Goddard Rosae7d28602009-12-14 18:01:06 -08001941 fmt = skip_spaces(++fmt);
1942 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 }
1944
1945 /* anything that is not a conversion must match exactly */
1946 if (*fmt != '%' && *fmt) {
1947 if (*fmt++ != *str++)
1948 break;
1949 continue;
1950 }
1951
1952 if (!*fmt)
1953 break;
1954 ++fmt;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001955
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 /* skip this conversion.
1957 * advance both strings to next white space
1958 */
1959 if (*fmt == '*') {
Andy Spencer8fccae22009-10-01 15:44:27 -07001960 while (!isspace(*fmt) && *fmt != '%' && *fmt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 fmt++;
1962 while (!isspace(*str) && *str)
1963 str++;
1964 continue;
1965 }
1966
1967 /* get field width */
1968 field_width = -1;
1969 if (isdigit(*fmt))
1970 field_width = skip_atoi(&fmt);
1971
1972 /* get conversion qualifier */
1973 qualifier = -1;
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001974 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1975 TOLOWER(*fmt) == 'z') {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 qualifier = *fmt++;
1977 if (unlikely(qualifier == *fmt)) {
1978 if (qualifier == 'h') {
1979 qualifier = 'H';
1980 fmt++;
1981 } else if (qualifier == 'l') {
1982 qualifier = 'L';
1983 fmt++;
1984 }
1985 }
1986 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987
1988 if (!*fmt || !*str)
1989 break;
1990
André Goddard Rosad4be1512009-12-14 18:00:59 -08001991 base = 10;
1992 is_sign = 0;
1993
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001994 switch (*fmt++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 case 'c':
1996 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001997 char *s = (char *)va_arg(args, char*);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998 if (field_width == -1)
1999 field_width = 1;
2000 do {
2001 *s++ = *str++;
2002 } while (--field_width > 0 && *str);
2003 num++;
2004 }
2005 continue;
2006 case 's':
2007 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002008 char *s = (char *)va_arg(args, char *);
2009 if (field_width == -1)
Alexey Dobriyan4be929b2010-05-24 14:33:03 -07002010 field_width = SHRT_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011 /* first, skip leading white space in buffer */
André Goddard Rosae7d28602009-12-14 18:01:06 -08002012 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013
2014 /* now copy until next white space */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002015 while (*str && !isspace(*str) && field_width--)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 *s++ = *str++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017 *s = '\0';
2018 num++;
2019 }
2020 continue;
2021 case 'n':
2022 /* return number of characters read so far */
2023 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002024 int *i = (int *)va_arg(args, int*);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 *i = str - buf;
2026 }
2027 continue;
2028 case 'o':
2029 base = 8;
2030 break;
2031 case 'x':
2032 case 'X':
2033 base = 16;
2034 break;
2035 case 'i':
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002036 base = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037 case 'd':
2038 is_sign = 1;
2039 case 'u':
2040 break;
2041 case '%':
2042 /* looking for '%' in str */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002043 if (*str++ != '%')
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044 return num;
2045 continue;
2046 default:
2047 /* invalid format; stop here */
2048 return num;
2049 }
2050
2051 /* have some sort of integer conversion.
2052 * first, skip white space in buffer.
2053 */
André Goddard Rosae7d28602009-12-14 18:01:06 -08002054 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002055
2056 digit = *str;
2057 if (is_sign && digit == '-')
2058 digit = *(str + 1);
2059
2060 if (!digit
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002061 || (base == 16 && !isxdigit(digit))
2062 || (base == 10 && !isdigit(digit))
2063 || (base == 8 && (!isdigit(digit) || digit > '7'))
2064 || (base == 0 && !isdigit(digit)))
2065 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002067 switch (qualifier) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 case 'H': /* that's 'hh' in format */
2069 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002070 signed char *s = (signed char *)va_arg(args, signed char *);
2071 *s = (signed char)simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002073 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
2074 *s = (unsigned char)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 }
2076 break;
2077 case 'h':
2078 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002079 short *s = (short *)va_arg(args, short *);
2080 *s = (short)simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002082 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
2083 *s = (unsigned short)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084 }
2085 break;
2086 case 'l':
2087 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002088 long *l = (long *)va_arg(args, long *);
2089 *l = simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002091 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
2092 *l = simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093 }
2094 break;
2095 case 'L':
2096 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002097 long long *l = (long long *)va_arg(args, long long *);
2098 *l = simple_strtoll(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002100 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
2101 *l = simple_strtoull(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 }
2103 break;
2104 case 'Z':
2105 case 'z':
2106 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002107 size_t *s = (size_t *)va_arg(args, size_t *);
2108 *s = (size_t)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109 }
2110 break;
2111 default:
2112 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002113 int *i = (int *)va_arg(args, int *);
2114 *i = (int)simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002116 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
2117 *i = (unsigned int)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118 }
2119 break;
2120 }
2121 num++;
2122
2123 if (!next)
2124 break;
2125 str = next;
2126 }
Johannes Bergc6b40d12007-05-08 00:27:20 -07002127
2128 /*
2129 * Now we've come all the way through so either the input string or the
2130 * format ended. In the former case, there can be a %n at the current
2131 * position in the format that needs to be filled.
2132 */
2133 if (*fmt == '%' && *(fmt + 1) == 'n') {
2134 int *p = (int *)va_arg(args, int *);
2135 *p = str - buf;
2136 }
2137
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138 return num;
2139}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140EXPORT_SYMBOL(vsscanf);
2141
2142/**
2143 * sscanf - Unformat a buffer into a list of arguments
2144 * @buf: input buffer
2145 * @fmt: formatting of buffer
2146 * @...: resulting arguments
2147 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002148int sscanf(const char *buf, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149{
2150 va_list args;
2151 int i;
2152
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002153 va_start(args, fmt);
2154 i = vsscanf(buf, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002156
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157 return i;
2158}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159EXPORT_SYMBOL(sscanf);