blob: 292fcb174a3285dc9a39f577bb15bdcce2202229 [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>
Paul Gortmaker8bc3bcc2011-11-16 21:29:17 -050020#include <linux/module.h> /* for KSYM_SYMBOL_LEN */
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#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>
Jan Beulich53809752012-12-17 16:01:31 -080026#include <linux/math64.h>
Linus Torvalds0fe1ef22008-07-06 16:43:12 -070027#include <linux/uaccess.h>
Linus Torvalds332d2e72008-10-20 15:07:34 +110028#include <linux/ioport.h>
Joe Perches8a27f7c2009-08-17 12:29:44 +000029#include <net/addrconf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Tim Schmielau4e57b682005-10-30 15:03:48 -080031#include <asm/page.h> /* for PAGE_SIZE */
James Bottomleydeac93d2008-09-03 20:43:36 -050032#include <asm/sections.h> /* for dereference_function_descriptor() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Alexey Dobriyan1dff46d2011-10-31 17:12:28 -070034#include "kstrtox.h"
Harvey Harrisonaa46a632008-10-16 13:40:34 -070035
Linus Torvalds1da177e2005-04-16 15:20:36 -070036/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 * simple_strtoull - convert a string to an unsigned long long
38 * @cp: The start of the string
39 * @endp: A pointer to the end of the parsed string will be placed here
40 * @base: The number base to use
41 */
Harvey Harrison22d27052008-10-16 13:40:35 -070042unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
Alexey Dobriyan1dff46d2011-10-31 17:12:28 -070044 unsigned long long result;
45 unsigned int rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Alexey Dobriyan1dff46d2011-10-31 17:12:28 -070047 cp = _parse_integer_fixup_radix(cp, &base);
48 rv = _parse_integer(cp, base, &result);
49 /* FIXME */
50 cp += (rv & ~KSTRTOX_OVERFLOW);
Harvey Harrisonaa46a632008-10-16 13:40:34 -070051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 if (endp)
53 *endp = (char *)cp;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -080054
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 return result;
56}
Linus Torvalds1da177e2005-04-16 15:20:36 -070057EXPORT_SYMBOL(simple_strtoull);
58
59/**
André Goddard Rosa922ac252009-12-14 18:01:01 -080060 * simple_strtoul - convert a string to an unsigned long
61 * @cp: The start of the string
62 * @endp: A pointer to the end of the parsed string will be placed here
63 * @base: The number base to use
64 */
65unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
66{
67 return simple_strtoull(cp, endp, base);
68}
69EXPORT_SYMBOL(simple_strtoul);
70
71/**
72 * simple_strtol - convert a string to a signed long
73 * @cp: The start of the string
74 * @endp: A pointer to the end of the parsed string will be placed here
75 * @base: The number base to use
76 */
77long simple_strtol(const char *cp, char **endp, unsigned int base)
78{
79 if (*cp == '-')
80 return -simple_strtoul(cp + 1, endp, base);
81
82 return simple_strtoul(cp, endp, base);
83}
84EXPORT_SYMBOL(simple_strtol);
85
86/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 * simple_strtoll - convert a string to a signed long long
88 * @cp: The start of the string
89 * @endp: A pointer to the end of the parsed string will be placed here
90 * @base: The number base to use
91 */
Harvey Harrison22d27052008-10-16 13:40:35 -070092long long simple_strtoll(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -080094 if (*cp == '-')
Harvey Harrison22d27052008-10-16 13:40:35 -070095 return -simple_strtoull(cp + 1, endp, base);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -080096
Harvey Harrison22d27052008-10-16 13:40:35 -070097 return simple_strtoull(cp, endp, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
Hans Verkuil98d5ce02010-04-23 13:18:04 -040099EXPORT_SYMBOL(simple_strtoll);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Joe Perchescf3b4292010-05-24 14:33:16 -0700101static noinline_for_stack
102int skip_atoi(const char **s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800104 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106 while (isdigit(**s))
107 i = i*10 + *((*s)++) - '0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return i;
110}
111
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700112/* Decimal conversion is by far the most typical, and is used
113 * for /proc and /sys data. This directly impacts e.g. top performance
114 * with many processes running. We optimize it for speed
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700115 * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
116 * (with permission from the author, Douglas W. Jones).
117 */
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700118
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700119#if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
120/* Formats correctly any integer in [0, 999999999] */
Joe Perchescf3b4292010-05-24 14:33:16 -0700121static noinline_for_stack
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700122char *put_dec_full9(char *buf, unsigned q)
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700123{
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700124 unsigned r;
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700125
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800126 /*
127 * Possible ways to approx. divide by 10
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700128 * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit)
129 * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul)
130 * (x * 0x6667) >> 18 x < 43699
131 * (x * 0x3334) >> 17 x < 16389
132 * (x * 0x199a) >> 16 x < 16389
133 * (x * 0x0ccd) >> 15 x < 16389
134 * (x * 0x0667) >> 14 x < 2739
135 * (x * 0x0334) >> 13 x < 1029
136 * (x * 0x019a) >> 12 x < 1029
137 * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386)
138 * (x * 0x0067) >> 10 x < 179
139 * (x * 0x0034) >> 9 x < 69 same
140 * (x * 0x001a) >> 8 x < 69 same
141 * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386)
142 * (x * 0x0007) >> 6 x < 19
143 * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800144 */
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700145 r = (q * (uint64_t)0x1999999a) >> 32;
146 *buf++ = (q - 10 * r) + '0'; /* 1 */
147 q = (r * (uint64_t)0x1999999a) >> 32;
148 *buf++ = (r - 10 * q) + '0'; /* 2 */
149 r = (q * (uint64_t)0x1999999a) >> 32;
150 *buf++ = (q - 10 * r) + '0'; /* 3 */
151 q = (r * (uint64_t)0x1999999a) >> 32;
152 *buf++ = (r - 10 * q) + '0'; /* 4 */
153 r = (q * (uint64_t)0x1999999a) >> 32;
154 *buf++ = (q - 10 * r) + '0'; /* 5 */
155 /* Now value is under 10000, can avoid 64-bit multiply */
156 q = (r * 0x199a) >> 16;
157 *buf++ = (r - 10 * q) + '0'; /* 6 */
158 r = (q * 0xcd) >> 11;
159 *buf++ = (q - 10 * r) + '0'; /* 7 */
160 q = (r * 0xcd) >> 11;
161 *buf++ = (r - 10 * q) + '0'; /* 8 */
162 *buf++ = q + '0'; /* 9 */
163 return buf;
164}
165#endif
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700166
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700167/* Similar to above but do not pad with zeros.
168 * Code can be easily arranged to print 9 digits too, but our callers
169 * always call put_dec_full9() instead when the number has 9 decimal digits.
170 */
171static noinline_for_stack
172char *put_dec_trunc8(char *buf, unsigned r)
173{
174 unsigned q;
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700175
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700176 /* Copy of previous function's body with added early returns */
George Spelvincb239d02012-10-04 17:12:30 -0700177 while (r >= 10000) {
178 q = r + '0';
179 r = (r * (uint64_t)0x1999999a) >> 32;
180 *buf++ = q - 10*r;
181 }
182
George Spelvinf4000512012-10-04 17:12:32 -0700183 q = (r * 0x199a) >> 16; /* r <= 9999 */
184 *buf++ = (r - 10 * q) + '0';
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700185 if (q == 0)
186 return buf;
George Spelvinf4000512012-10-04 17:12:32 -0700187 r = (q * 0xcd) >> 11; /* q <= 999 */
188 *buf++ = (q - 10 * r) + '0';
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700189 if (r == 0)
190 return buf;
George Spelvinf4000512012-10-04 17:12:32 -0700191 q = (r * 0xcd) >> 11; /* r <= 99 */
192 *buf++ = (r - 10 * q) + '0';
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700193 if (q == 0)
194 return buf;
George Spelvinf4000512012-10-04 17:12:32 -0700195 *buf++ = q + '0'; /* q <= 9 */
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700196 return buf;
197}
198
199/* There are two algorithms to print larger numbers.
200 * One is generic: divide by 1000000000 and repeatedly print
201 * groups of (up to) 9 digits. It's conceptually simple,
202 * but requires a (unsigned long long) / 1000000000 division.
203 *
204 * Second algorithm splits 64-bit unsigned long long into 16-bit chunks,
205 * manipulates them cleverly and generates groups of 4 decimal digits.
206 * It so happens that it does NOT require long long division.
207 *
208 * If long is > 32 bits, division of 64-bit values is relatively easy,
209 * and we will use the first algorithm.
210 * If long long is > 64 bits (strange architecture with VERY large long long),
211 * second algorithm can't be used, and we again use the first one.
212 *
213 * Else (if long is 32 bits and long long is 64 bits) we use second one.
214 */
215
216#if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
217
218/* First algorithm: generic */
219
220static
221char *put_dec(char *buf, unsigned long long n)
222{
223 if (n >= 100*1000*1000) {
224 while (n >= 1000*1000*1000)
225 buf = put_dec_full9(buf, do_div(n, 1000*1000*1000));
226 if (n >= 100*1000*1000)
227 return put_dec_full9(buf, n);
228 }
229 return put_dec_trunc8(buf, n);
230}
231
232#else
233
234/* Second algorithm: valid only for 64-bit long longs */
235
George Spelvine49317d2012-10-04 17:12:27 -0700236/* See comment in put_dec_full9 for choice of constants */
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700237static noinline_for_stack
George Spelvin23591722012-10-04 17:12:29 -0700238void put_dec_full4(char *buf, unsigned q)
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700239{
240 unsigned r;
George Spelvine49317d2012-10-04 17:12:27 -0700241 r = (q * 0xccd) >> 15;
George Spelvin23591722012-10-04 17:12:29 -0700242 buf[0] = (q - 10 * r) + '0';
George Spelvine49317d2012-10-04 17:12:27 -0700243 q = (r * 0xcd) >> 11;
George Spelvin23591722012-10-04 17:12:29 -0700244 buf[1] = (r - 10 * q) + '0';
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700245 r = (q * 0xcd) >> 11;
George Spelvin23591722012-10-04 17:12:29 -0700246 buf[2] = (q - 10 * r) + '0';
247 buf[3] = r + '0';
248}
249
250/*
251 * Call put_dec_full4 on x % 10000, return x / 10000.
252 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
253 * holds for all x < 1,128,869,999. The largest value this
254 * helper will ever be asked to convert is 1,125,520,955.
255 * (d1 in the put_dec code, assuming n is all-ones).
256 */
257static
258unsigned put_dec_helper4(char *buf, unsigned x)
259{
260 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
261
262 put_dec_full4(buf, x - q * 10000);
263 return q;
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700264}
265
266/* Based on code by Douglas W. Jones found at
267 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
268 * (with permission from the author).
269 * Performs no 64-bit division and hence should be fast on 32-bit machines.
270 */
271static
272char *put_dec(char *buf, unsigned long long n)
273{
274 uint32_t d3, d2, d1, q, h;
275
276 if (n < 100*1000*1000)
277 return put_dec_trunc8(buf, n);
278
279 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
280 h = (n >> 32);
281 d2 = (h ) & 0xffff;
282 d3 = (h >> 16); /* implicit "& 0xffff" */
283
284 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
George Spelvin23591722012-10-04 17:12:29 -0700285 q = put_dec_helper4(buf, q);
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700286
George Spelvin23591722012-10-04 17:12:29 -0700287 q += 7671 * d3 + 9496 * d2 + 6 * d1;
288 q = put_dec_helper4(buf+4, q);
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700289
George Spelvin23591722012-10-04 17:12:29 -0700290 q += 4749 * d3 + 42 * d2;
291 q = put_dec_helper4(buf+8, q);
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700292
George Spelvin23591722012-10-04 17:12:29 -0700293 q += 281 * d3;
294 buf += 12;
295 if (q)
296 buf = put_dec_trunc8(buf, q);
297 else while (buf[-1] == '0')
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700298 --buf;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800299
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700300 return buf;
301}
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700302
303#endif
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700304
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700305/*
306 * Convert passed number to decimal string.
307 * Returns the length of string. On buffer overflow, returns 0.
308 *
309 * If speed is not important, use snprintf(). It's easy to read the code.
310 */
311int num_to_str(char *buf, int size, unsigned long long num)
312{
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700313 char tmp[sizeof(num) * 3];
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700314 int idx, len;
315
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700316 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
317 if (num <= 9) {
318 tmp[0] = '0' + num;
319 len = 1;
320 } else {
321 len = put_dec(tmp, num) - tmp;
322 }
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700323
324 if (len > size)
325 return 0;
326 for (idx = 0; idx < len; ++idx)
327 buf[idx] = tmp[len - idx - 1];
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700328 return len;
KAMEZAWA Hiroyuki1ac101a2012-03-23 15:02:54 -0700329}
330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331#define ZEROPAD 1 /* pad with zero */
332#define SIGN 2 /* unsigned/signed long */
333#define PLUS 4 /* show plus */
334#define SPACE 8 /* space if plus */
335#define LEFT 16 /* left justified */
Bjorn Helgaasb89dc5d2010-03-05 10:47:31 -0700336#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
337#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100339enum format_type {
340 FORMAT_TYPE_NONE, /* Just a string part */
Vegard Nossumed681a92009-03-14 12:08:50 +0100341 FORMAT_TYPE_WIDTH,
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100342 FORMAT_TYPE_PRECISION,
343 FORMAT_TYPE_CHAR,
344 FORMAT_TYPE_STR,
345 FORMAT_TYPE_PTR,
346 FORMAT_TYPE_PERCENT_CHAR,
347 FORMAT_TYPE_INVALID,
348 FORMAT_TYPE_LONG_LONG,
349 FORMAT_TYPE_ULONG,
350 FORMAT_TYPE_LONG,
Zhaoleia4e94ef2009-03-27 17:07:05 +0800351 FORMAT_TYPE_UBYTE,
352 FORMAT_TYPE_BYTE,
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100353 FORMAT_TYPE_USHORT,
354 FORMAT_TYPE_SHORT,
355 FORMAT_TYPE_UINT,
356 FORMAT_TYPE_INT,
357 FORMAT_TYPE_NRCHARS,
358 FORMAT_TYPE_SIZE_T,
359 FORMAT_TYPE_PTRDIFF
360};
361
362struct printf_spec {
Joe Perches4e310fd2010-04-14 09:27:40 -0700363 u8 type; /* format_type enum */
Joe Perchesef0658f2010-03-06 17:10:14 -0800364 u8 flags; /* flags to number() */
Joe Perches4e310fd2010-04-14 09:27:40 -0700365 u8 base; /* number base, 8, 10 or 16 only */
366 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
367 s16 field_width; /* width of output field */
368 s16 precision; /* # of digits/chars */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100369};
370
Joe Perchescf3b4292010-05-24 14:33:16 -0700371static noinline_for_stack
372char *number(char *buf, char *end, unsigned long long num,
373 struct printf_spec spec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374{
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100375 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
376 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
377
378 char tmp[66];
379 char sign;
380 char locase;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100381 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 int i;
Pierre Carrier7c203422012-05-29 15:07:35 -0700383 bool is_zero = num == 0LL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100385 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
386 * produces same digits or (maybe lowercased) letters */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100387 locase = (spec.flags & SMALL);
388 if (spec.flags & LEFT)
389 spec.flags &= ~ZEROPAD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 sign = 0;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100391 if (spec.flags & SIGN) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800392 if ((signed long long)num < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 sign = '-';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800394 num = -(signed long long)num;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100395 spec.field_width--;
396 } else if (spec.flags & PLUS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 sign = '+';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100398 spec.field_width--;
399 } else if (spec.flags & SPACE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 sign = ' ';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100401 spec.field_width--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 }
403 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700404 if (need_pfx) {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100405 if (spec.base == 16)
Pierre Carrier7c203422012-05-29 15:07:35 -0700406 spec.field_width -= 2;
407 else if (!is_zero)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100408 spec.field_width--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700410
411 /* generate full string in tmp[], in reverse order */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 i = 0;
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700413 if (num < spec.base)
414 tmp[i++] = digits[num] | locase;
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700415 /* Generic code, for any base:
416 else do {
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100417 tmp[i++] = (digits[do_div(num,base)] | locase);
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700418 } while (num != 0);
419 */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100420 else if (spec.base != 10) { /* 8 or 16 */
421 int mask = spec.base - 1;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700422 int shift = 3;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800423
424 if (spec.base == 16)
425 shift = 4;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700426 do {
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100427 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700428 num >>= shift;
429 } while (num);
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700430 } else { /* base 10 */
431 i = put_dec(tmp, num) - tmp;
432 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700433
434 /* printing 100 using %2d gives "100", not "00" */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100435 if (i > spec.precision)
436 spec.precision = i;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700437 /* leading space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100438 spec.field_width -= spec.precision;
439 if (!(spec.flags & (ZEROPAD+LEFT))) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800440 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700441 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 *buf = ' ';
443 ++buf;
444 }
445 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700446 /* sign */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 if (sign) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700448 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 *buf = sign;
450 ++buf;
451 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700452 /* "0x" / "0" prefix */
453 if (need_pfx) {
Pierre Carrier7c203422012-05-29 15:07:35 -0700454 if (spec.base == 16 || !is_zero) {
455 if (buf < end)
456 *buf = '0';
457 ++buf;
458 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100459 if (spec.base == 16) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700460 if (buf < end)
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100461 *buf = ('X' | locase);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 ++buf;
463 }
464 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700465 /* zero or space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100466 if (!(spec.flags & LEFT)) {
467 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
468 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700469 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 *buf = c;
471 ++buf;
472 }
473 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700474 /* hmm even more zero padding? */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100475 while (i <= --spec.precision) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700476 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 *buf = '0';
478 ++buf;
479 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700480 /* actual digits of result */
481 while (--i >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700482 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 *buf = tmp[i];
484 ++buf;
485 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700486 /* trailing space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100487 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700488 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 *buf = ' ';
490 ++buf;
491 }
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 return buf;
494}
495
Joe Perchescf3b4292010-05-24 14:33:16 -0700496static noinline_for_stack
497char *string(char *buf, char *end, const char *s, struct printf_spec spec)
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700498{
499 int len, i;
500
501 if ((unsigned long)s < PAGE_SIZE)
André Goddard Rosa0f4f81d2009-12-14 18:00:55 -0800502 s = "(null)";
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700503
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100504 len = strnlen(s, spec.precision);
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700505
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100506 if (!(spec.flags & LEFT)) {
507 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700508 if (buf < end)
509 *buf = ' ';
510 ++buf;
511 }
512 }
513 for (i = 0; i < len; ++i) {
514 if (buf < end)
515 *buf = *s;
516 ++buf; ++s;
517 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100518 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700519 if (buf < end)
520 *buf = ' ';
521 ++buf;
522 }
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800523
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700524 return buf;
525}
526
Joe Perchescf3b4292010-05-24 14:33:16 -0700527static noinline_for_stack
528char *symbol_string(char *buf, char *end, void *ptr,
529 struct printf_spec spec, char ext)
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700530{
531 unsigned long value = (unsigned long) ptr;
532#ifdef CONFIG_KALLSYMS
533 char sym[KSYM_SYMBOL_LEN];
Namhyung Kim0f77a8d2011-03-24 11:42:29 +0900534 if (ext == 'B')
535 sprint_backtrace(sym, value);
536 else if (ext != 'f' && ext != 's')
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200537 sprint_symbol(sym, value);
538 else
Stephen Boyd4796dd22012-05-29 15:07:33 -0700539 sprint_symbol_no_offset(sym, value);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800540
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100541 return string(buf, end, sym, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700542#else
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800543 spec.field_width = 2 * sizeof(void *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100544 spec.flags |= SPECIAL | SMALL | ZEROPAD;
545 spec.base = 16;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800546
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100547 return number(buf, end, value, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700548#endif
549}
550
Joe Perchescf3b4292010-05-24 14:33:16 -0700551static noinline_for_stack
552char *resource_string(char *buf, char *end, struct resource *res,
553 struct printf_spec spec, const char *fmt)
Linus Torvalds332d2e72008-10-20 15:07:34 +1100554{
555#ifndef IO_RSRC_PRINTK_SIZE
Bjorn Helgaas28405372009-10-06 15:33:29 -0600556#define IO_RSRC_PRINTK_SIZE 6
Linus Torvalds332d2e72008-10-20 15:07:34 +1100557#endif
558
559#ifndef MEM_RSRC_PRINTK_SIZE
Bjorn Helgaas28405372009-10-06 15:33:29 -0600560#define MEM_RSRC_PRINTK_SIZE 10
Linus Torvalds332d2e72008-10-20 15:07:34 +1100561#endif
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700562 static const struct printf_spec io_spec = {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100563 .base = 16,
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700564 .field_width = IO_RSRC_PRINTK_SIZE,
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100565 .precision = -1,
566 .flags = SPECIAL | SMALL | ZEROPAD,
567 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700568 static const struct printf_spec mem_spec = {
569 .base = 16,
570 .field_width = MEM_RSRC_PRINTK_SIZE,
571 .precision = -1,
572 .flags = SPECIAL | SMALL | ZEROPAD,
573 };
Bjorn Helgaas0f4050c2010-03-05 10:47:42 -0700574 static const struct printf_spec bus_spec = {
575 .base = 16,
576 .field_width = 2,
577 .precision = -1,
578 .flags = SMALL | ZEROPAD,
579 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700580 static const struct printf_spec dec_spec = {
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600581 .base = 10,
582 .precision = -1,
583 .flags = 0,
584 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700585 static const struct printf_spec str_spec = {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600586 .field_width = -1,
587 .precision = 10,
588 .flags = LEFT,
589 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700590 static const struct printf_spec flag_spec = {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600591 .base = 16,
592 .precision = -1,
593 .flags = SPECIAL | SMALL,
594 };
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600595
596 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
597 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
598#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
599#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
Bjorn Helgaas9d7cca02010-03-05 10:47:47 -0700600#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600601#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
602 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
603 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
604
Linus Torvalds332d2e72008-10-20 15:07:34 +1100605 char *p = sym, *pend = sym + sizeof(sym);
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600606 int decode = (fmt[0] == 'R') ? 1 : 0;
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700607 const struct printf_spec *specp;
Linus Torvalds332d2e72008-10-20 15:07:34 +1100608
609 *p++ = '[';
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700610 if (res->flags & IORESOURCE_IO) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600611 p = string(p, pend, "io ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700612 specp = &io_spec;
613 } else if (res->flags & IORESOURCE_MEM) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600614 p = string(p, pend, "mem ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700615 specp = &mem_spec;
616 } else if (res->flags & IORESOURCE_IRQ) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600617 p = string(p, pend, "irq ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700618 specp = &dec_spec;
619 } else if (res->flags & IORESOURCE_DMA) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600620 p = string(p, pend, "dma ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700621 specp = &dec_spec;
Bjorn Helgaas0f4050c2010-03-05 10:47:42 -0700622 } else if (res->flags & IORESOURCE_BUS) {
623 p = string(p, pend, "bus ", str_spec);
624 specp = &bus_spec;
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700625 } else {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600626 p = string(p, pend, "??? ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700627 specp = &mem_spec;
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600628 decode = 0;
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600629 }
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700630 p = number(p, pend, res->start, *specp);
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600631 if (res->start != res->end) {
632 *p++ = '-';
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700633 p = number(p, pend, res->end, *specp);
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600634 }
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600635 if (decode) {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600636 if (res->flags & IORESOURCE_MEM_64)
637 p = string(p, pend, " 64bit", str_spec);
638 if (res->flags & IORESOURCE_PREFETCH)
639 p = string(p, pend, " pref", str_spec);
Bjorn Helgaas9d7cca02010-03-05 10:47:47 -0700640 if (res->flags & IORESOURCE_WINDOW)
641 p = string(p, pend, " window", str_spec);
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600642 if (res->flags & IORESOURCE_DISABLED)
643 p = string(p, pend, " disabled", str_spec);
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600644 } else {
645 p = string(p, pend, " flags ", str_spec);
646 p = number(p, pend, res->flags, flag_spec);
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600647 }
Linus Torvalds332d2e72008-10-20 15:07:34 +1100648 *p++ = ']';
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600649 *p = '\0';
Linus Torvalds332d2e72008-10-20 15:07:34 +1100650
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100651 return string(buf, end, sym, spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100652}
653
Joe Perchescf3b4292010-05-24 14:33:16 -0700654static noinline_for_stack
Andy Shevchenko31550a12012-07-30 14:40:27 -0700655char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
656 const char *fmt)
657{
658 int i, len = 1; /* if we pass '%ph[CDN]', field witdh remains
659 negative value, fallback to the default */
660 char separator;
661
662 if (spec.field_width == 0)
663 /* nothing to print */
664 return buf;
665
666 if (ZERO_OR_NULL_PTR(addr))
667 /* NULL pointer */
668 return string(buf, end, NULL, spec);
669
670 switch (fmt[1]) {
671 case 'C':
672 separator = ':';
673 break;
674 case 'D':
675 separator = '-';
676 break;
677 case 'N':
678 separator = 0;
679 break;
680 default:
681 separator = ' ';
682 break;
683 }
684
685 if (spec.field_width > 0)
686 len = min_t(int, spec.field_width, 64);
687
688 for (i = 0; i < len && buf < end - 1; i++) {
689 buf = hex_byte_pack(buf, addr[i]);
690
691 if (buf < end && separator && i != len - 1)
692 *buf++ = separator;
693 }
694
695 return buf;
696}
697
698static noinline_for_stack
Joe Perchescf3b4292010-05-24 14:33:16 -0700699char *mac_address_string(char *buf, char *end, u8 *addr,
700 struct printf_spec spec, const char *fmt)
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700701{
Joe Perches8a27f7c2009-08-17 12:29:44 +0000702 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700703 char *p = mac_addr;
704 int i;
Joe Perchesbc7259a2010-01-07 11:43:50 +0000705 char separator;
Andrei Emeltchenko76597ff92012-07-30 14:40:23 -0700706 bool reversed = false;
Joe Perchesbc7259a2010-01-07 11:43:50 +0000707
Andrei Emeltchenko76597ff92012-07-30 14:40:23 -0700708 switch (fmt[1]) {
709 case 'F':
Joe Perchesbc7259a2010-01-07 11:43:50 +0000710 separator = '-';
Andrei Emeltchenko76597ff92012-07-30 14:40:23 -0700711 break;
712
713 case 'R':
714 reversed = true;
715 /* fall through */
716
717 default:
Joe Perchesbc7259a2010-01-07 11:43:50 +0000718 separator = ':';
Andrei Emeltchenko76597ff92012-07-30 14:40:23 -0700719 break;
Joe Perchesbc7259a2010-01-07 11:43:50 +0000720 }
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700721
722 for (i = 0; i < 6; i++) {
Andrei Emeltchenko76597ff92012-07-30 14:40:23 -0700723 if (reversed)
724 p = hex_byte_pack(p, addr[5 - i]);
725 else
726 p = hex_byte_pack(p, addr[i]);
727
Joe Perches8a27f7c2009-08-17 12:29:44 +0000728 if (fmt[0] == 'M' && i != 5)
Joe Perchesbc7259a2010-01-07 11:43:50 +0000729 *p++ = separator;
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700730 }
731 *p = '\0';
732
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100733 return string(buf, end, mac_addr, spec);
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700734}
735
Joe Perchescf3b4292010-05-24 14:33:16 -0700736static noinline_for_stack
737char *ip4_string(char *p, const u8 *addr, const char *fmt)
Harvey Harrison689afa72008-10-28 16:04:44 -0700738{
Harvey Harrison689afa72008-10-28 16:04:44 -0700739 int i;
Joe Perches0159f242010-01-13 20:23:30 -0800740 bool leading_zeros = (fmt[0] == 'i');
741 int index;
742 int step;
Harvey Harrison689afa72008-10-28 16:04:44 -0700743
Joe Perches0159f242010-01-13 20:23:30 -0800744 switch (fmt[2]) {
745 case 'h':
746#ifdef __BIG_ENDIAN
747 index = 0;
748 step = 1;
749#else
750 index = 3;
751 step = -1;
752#endif
753 break;
754 case 'l':
755 index = 3;
756 step = -1;
757 break;
758 case 'n':
759 case 'b':
760 default:
761 index = 0;
762 step = 1;
763 break;
764 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000765 for (i = 0; i < 4; i++) {
766 char temp[3]; /* hold each IP quad in reverse order */
Denys Vlasenko133fd9f2012-05-31 16:26:08 -0700767 int digits = put_dec_trunc8(temp, addr[index]) - temp;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000768 if (leading_zeros) {
769 if (digits < 3)
770 *p++ = '0';
771 if (digits < 2)
772 *p++ = '0';
773 }
774 /* reverse the digits in the quad */
775 while (digits--)
776 *p++ = temp[digits];
777 if (i < 3)
778 *p++ = '.';
Joe Perches0159f242010-01-13 20:23:30 -0800779 index += step;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000780 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000781 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800782
Joe Perches8a27f7c2009-08-17 12:29:44 +0000783 return p;
784}
785
Joe Perchescf3b4292010-05-24 14:33:16 -0700786static noinline_for_stack
787char *ip6_compressed_string(char *p, const char *addr)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000788{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800789 int i, j, range;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000790 unsigned char zerolength[8];
791 int longest = 1;
792 int colonpos = -1;
793 u16 word;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800794 u8 hi, lo;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000795 bool needcolon = false;
Joe Percheseb78cd22009-09-18 13:04:06 +0000796 bool useIPv4;
797 struct in6_addr in6;
798
799 memcpy(&in6, addr, sizeof(struct in6_addr));
800
801 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000802
803 memset(zerolength, 0, sizeof(zerolength));
804
805 if (useIPv4)
806 range = 6;
807 else
808 range = 8;
809
810 /* find position of longest 0 run */
811 for (i = 0; i < range; i++) {
812 for (j = i; j < range; j++) {
Joe Percheseb78cd22009-09-18 13:04:06 +0000813 if (in6.s6_addr16[j] != 0)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000814 break;
815 zerolength[i]++;
816 }
817 }
818 for (i = 0; i < range; i++) {
819 if (zerolength[i] > longest) {
820 longest = zerolength[i];
821 colonpos = i;
822 }
823 }
Joe Perches29cf5192011-06-09 11:23:37 -0700824 if (longest == 1) /* don't compress a single 0 */
825 colonpos = -1;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000826
827 /* emit address */
828 for (i = 0; i < range; i++) {
829 if (i == colonpos) {
830 if (needcolon || i == 0)
831 *p++ = ':';
832 *p++ = ':';
833 needcolon = false;
834 i += longest - 1;
835 continue;
836 }
837 if (needcolon) {
838 *p++ = ':';
839 needcolon = false;
840 }
841 /* hex u16 without leading 0s */
Joe Percheseb78cd22009-09-18 13:04:06 +0000842 word = ntohs(in6.s6_addr16[i]);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000843 hi = word >> 8;
844 lo = word & 0xff;
845 if (hi) {
846 if (hi > 0x0f)
Andy Shevchenko55036ba2011-10-31 17:12:41 -0700847 p = hex_byte_pack(p, hi);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000848 else
849 *p++ = hex_asc_lo(hi);
Andy Shevchenko55036ba2011-10-31 17:12:41 -0700850 p = hex_byte_pack(p, lo);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000851 }
André Goddard Rosab5ff9922009-12-14 18:00:59 -0800852 else if (lo > 0x0f)
Andy Shevchenko55036ba2011-10-31 17:12:41 -0700853 p = hex_byte_pack(p, lo);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000854 else
855 *p++ = hex_asc_lo(lo);
856 needcolon = true;
857 }
858
859 if (useIPv4) {
860 if (needcolon)
861 *p++ = ':';
Joe Perches0159f242010-01-13 20:23:30 -0800862 p = ip4_string(p, &in6.s6_addr[12], "I4");
Joe Perches8a27f7c2009-08-17 12:29:44 +0000863 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000864 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800865
Joe Perches8a27f7c2009-08-17 12:29:44 +0000866 return p;
867}
868
Joe Perchescf3b4292010-05-24 14:33:16 -0700869static noinline_for_stack
870char *ip6_string(char *p, const char *addr, const char *fmt)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000871{
872 int i;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800873
Harvey Harrison689afa72008-10-28 16:04:44 -0700874 for (i = 0; i < 8; i++) {
Andy Shevchenko55036ba2011-10-31 17:12:41 -0700875 p = hex_byte_pack(p, *addr++);
876 p = hex_byte_pack(p, *addr++);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000877 if (fmt[0] == 'I' && i != 7)
Harvey Harrison689afa72008-10-28 16:04:44 -0700878 *p++ = ':';
879 }
880 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800881
Joe Perches8a27f7c2009-08-17 12:29:44 +0000882 return p;
883}
884
Joe Perchescf3b4292010-05-24 14:33:16 -0700885static noinline_for_stack
886char *ip6_addr_string(char *buf, char *end, const u8 *addr,
887 struct printf_spec spec, const char *fmt)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000888{
889 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
890
891 if (fmt[0] == 'I' && fmt[2] == 'c')
Joe Percheseb78cd22009-09-18 13:04:06 +0000892 ip6_compressed_string(ip6_addr, addr);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000893 else
Joe Percheseb78cd22009-09-18 13:04:06 +0000894 ip6_string(ip6_addr, addr, fmt);
Harvey Harrison689afa72008-10-28 16:04:44 -0700895
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100896 return string(buf, end, ip6_addr, spec);
Harvey Harrison689afa72008-10-28 16:04:44 -0700897}
898
Joe Perchescf3b4292010-05-24 14:33:16 -0700899static noinline_for_stack
900char *ip4_addr_string(char *buf, char *end, const u8 *addr,
901 struct printf_spec spec, const char *fmt)
Harvey Harrison4aa99602008-10-29 12:49:58 -0700902{
Joe Perches8a27f7c2009-08-17 12:29:44 +0000903 char ip4_addr[sizeof("255.255.255.255")];
Harvey Harrison4aa99602008-10-29 12:49:58 -0700904
Joe Perches0159f242010-01-13 20:23:30 -0800905 ip4_string(ip4_addr, addr, fmt);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700906
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100907 return string(buf, end, ip4_addr, spec);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700908}
909
Joe Perchescf3b4292010-05-24 14:33:16 -0700910static noinline_for_stack
911char *uuid_string(char *buf, char *end, const u8 *addr,
912 struct printf_spec spec, const char *fmt)
Joe Perches9ac6e442009-12-14 18:01:09 -0800913{
914 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
915 char *p = uuid;
916 int i;
917 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
918 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
919 const u8 *index = be;
920 bool uc = false;
921
922 switch (*(++fmt)) {
923 case 'L':
924 uc = true; /* fall-through */
925 case 'l':
926 index = le;
927 break;
928 case 'B':
929 uc = true;
930 break;
931 }
932
933 for (i = 0; i < 16; i++) {
Andy Shevchenko55036ba2011-10-31 17:12:41 -0700934 p = hex_byte_pack(p, addr[index[i]]);
Joe Perches9ac6e442009-12-14 18:01:09 -0800935 switch (i) {
936 case 3:
937 case 5:
938 case 7:
939 case 9:
940 *p++ = '-';
941 break;
942 }
943 }
944
945 *p = 0;
946
947 if (uc) {
948 p = uuid;
949 do {
950 *p = toupper(*p);
951 } while (*(++p));
952 }
953
954 return string(buf, end, uuid, spec);
955}
956
Michał Mirosławc8f44af2011-11-15 15:29:55 +0000957static
958char *netdev_feature_string(char *buf, char *end, const u8 *addr,
959 struct printf_spec spec)
960{
961 spec.flags |= SPECIAL | SMALL | ZEROPAD;
962 if (spec.field_width == -1)
963 spec.field_width = 2 + 2 * sizeof(netdev_features_t);
964 spec.base = 16;
965
966 return number(buf, end, *(const netdev_features_t *)addr, spec);
967}
968
Ingo Molnar411f05f2011-05-12 23:00:28 +0200969int kptr_restrict __read_mostly;
Dan Rosenberg455cd5a2011-01-12 16:59:41 -0800970
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700971/*
972 * Show a '%p' thing. A kernel extension is that the '%p' is followed
973 * by an extra set of alphanumeric characters that are extended format
974 * specifiers.
975 *
Linus Torvalds332d2e72008-10-20 15:07:34 +1100976 * Right now we handle:
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700977 *
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200978 * - 'F' For symbolic function descriptor pointers with offset
979 * - 'f' For simple symbolic function names without offset
Steven Rostedt0efb4d22009-09-17 09:27:29 -0400980 * - 'S' For symbolic direct pointers with offset
981 * - 's' For symbolic direct pointers without offset
Namhyung Kim0f77a8d2011-03-24 11:42:29 +0900982 * - 'B' For backtraced symbolic direct pointers with offset
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600983 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
984 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700985 * - 'M' For a 6-byte MAC address, it prints the address in the
986 * usual colon-separated hex notation
Joe Perches8a27f7c2009-08-17 12:29:44 +0000987 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
Joe Perchesbc7259a2010-01-07 11:43:50 +0000988 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
Joe Perchesc8e00062010-01-11 00:44:14 -0800989 * with a dash-separated hex notation
Andy Shevchenko7c591542012-10-04 17:12:33 -0700990 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000991 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
992 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
993 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
994 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
995 * IPv6 omits the colons (01020304...0f)
996 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
Joe Perches0159f242010-01-13 20:23:30 -0800997 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
Joe Perches8a27f7c2009-08-17 12:29:44 +0000998 * - 'I6c' for IPv6 addresses printed as specified by
Joe Perches29cf5192011-06-09 11:23:37 -0700999 * http://tools.ietf.org/html/rfc5952
Joe Perches9ac6e442009-12-14 18:01:09 -08001000 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
1001 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
1002 * Options for %pU are:
1003 * b big endian lower case hex (default)
1004 * B big endian UPPER case hex
1005 * l little endian lower case hex
1006 * L little endian UPPER case hex
1007 * big endian output byte order is:
1008 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
1009 * little endian output byte order is:
1010 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
Joe Perches7db6f5f2010-06-27 01:02:33 +00001011 * - 'V' For a struct va_format which contains a format string * and va_list *,
1012 * call vsnprintf(->format, *->va_list).
1013 * Implements a "recursive vsnprintf".
1014 * Do not use this feature without some mechanism to verify the
1015 * correctness of the format string and va_list arguments.
Dan Rosenberg455cd5a2011-01-12 16:59:41 -08001016 * - 'K' For a kernel pointer that should be hidden from unprivileged users
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001017 * - 'NF' For a netdev_features_t
Andy Shevchenko31550a12012-07-30 14:40:27 -07001018 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
1019 * a certain separator (' ' by default):
1020 * C colon
1021 * D dash
1022 * N no separator
1023 * The maximum supported length is 64 bytes of the input. Consider
1024 * to use print_hex_dump() for the larger input.
Joe Perches9ac6e442009-12-14 18:01:09 -08001025 *
Linus Torvalds332d2e72008-10-20 15:07:34 +11001026 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
1027 * function pointers are really function descriptors, which contain a
1028 * pointer to the real address.
Linus Torvalds4d8a7432008-07-06 16:24:57 -07001029 */
Joe Perchescf3b4292010-05-24 14:33:16 -07001030static noinline_for_stack
1031char *pointer(const char *fmt, char *buf, char *end, void *ptr,
1032 struct printf_spec spec)
Linus Torvalds78a8bf62008-07-06 16:16:15 -07001033{
Grant Likely725fe002012-05-31 16:26:08 -07001034 int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0);
1035
Kees Cook9f36e2c2011-03-22 16:34:22 -07001036 if (!ptr && *fmt != 'K') {
Joe Perches5e057982010-10-26 14:22:50 -07001037 /*
1038 * Print (null) with the same width as a pointer so it makes
1039 * tabular output look nice.
1040 */
1041 if (spec.field_width == -1)
Grant Likely725fe002012-05-31 16:26:08 -07001042 spec.field_width = default_width;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001043 return string(buf, end, "(null)", spec);
Joe Perches5e057982010-10-26 14:22:50 -07001044 }
Linus Torvaldsd97106a2009-01-03 11:46:17 -08001045
Linus Torvalds0fe1ef22008-07-06 16:43:12 -07001046 switch (*fmt) {
1047 case 'F':
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001048 case 'f':
Linus Torvalds0fe1ef22008-07-06 16:43:12 -07001049 ptr = dereference_function_descriptor(ptr);
1050 /* Fallthrough */
1051 case 'S':
Joe Perches9ac6e442009-12-14 18:01:09 -08001052 case 's':
Namhyung Kim0f77a8d2011-03-24 11:42:29 +09001053 case 'B':
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001054 return symbol_string(buf, end, ptr, spec, *fmt);
Linus Torvalds332d2e72008-10-20 15:07:34 +11001055 case 'R':
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -06001056 case 'r':
Bjorn Helgaasfd955412009-10-06 15:33:39 -06001057 return resource_string(buf, end, ptr, spec, fmt);
Andy Shevchenko31550a12012-07-30 14:40:27 -07001058 case 'h':
1059 return hex_string(buf, end, ptr, spec, fmt);
Joe Perches8a27f7c2009-08-17 12:29:44 +00001060 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1061 case 'm': /* Contiguous: 000102030405 */
Andrei Emeltchenko76597ff92012-07-30 14:40:23 -07001062 /* [mM]F (FDDI) */
1063 /* [mM]R (Reverse order; Bluetooth) */
Joe Perches8a27f7c2009-08-17 12:29:44 +00001064 return mac_address_string(buf, end, ptr, spec, fmt);
1065 case 'I': /* Formatted IP supported
1066 * 4: 1.2.3.4
1067 * 6: 0001:0203:...:0708
1068 * 6c: 1::708 or 1::1.2.3.4
1069 */
1070 case 'i': /* Contiguous:
1071 * 4: 001.002.003.004
1072 * 6: 000102...0f
1073 */
1074 switch (fmt[1]) {
1075 case '6':
1076 return ip6_addr_string(buf, end, ptr, spec, fmt);
1077 case '4':
1078 return ip4_addr_string(buf, end, ptr, spec, fmt);
1079 }
Harvey Harrison4aa99602008-10-29 12:49:58 -07001080 break;
Joe Perches9ac6e442009-12-14 18:01:09 -08001081 case 'U':
1082 return uuid_string(buf, end, ptr, spec, fmt);
Joe Perches7db6f5f2010-06-27 01:02:33 +00001083 case 'V':
Jan Beulich5756b762012-03-05 16:49:24 +00001084 {
1085 va_list va;
1086
1087 va_copy(va, *((struct va_format *)ptr)->va);
1088 buf += vsnprintf(buf, end > buf ? end - buf : 0,
1089 ((struct va_format *)ptr)->fmt, va);
1090 va_end(va);
1091 return buf;
1092 }
Dan Rosenberg455cd5a2011-01-12 16:59:41 -08001093 case 'K':
1094 /*
1095 * %pK cannot be used in IRQ context because its test
1096 * for CAP_SYSLOG would be meaningless.
1097 */
Dan Rosenberg3715c5302012-07-30 14:40:26 -07001098 if (kptr_restrict && (in_irq() || in_serving_softirq() ||
1099 in_nmi())) {
Dan Rosenberg455cd5a2011-01-12 16:59:41 -08001100 if (spec.field_width == -1)
Grant Likely725fe002012-05-31 16:26:08 -07001101 spec.field_width = default_width;
Dan Rosenberg455cd5a2011-01-12 16:59:41 -08001102 return string(buf, end, "pK-error", spec);
Dan Rosenberg455cd5a2011-01-12 16:59:41 -08001103 }
Joe Perches26297602011-03-22 16:34:19 -07001104 if (!((kptr_restrict == 0) ||
1105 (kptr_restrict == 1 &&
1106 has_capability_noaudit(current, CAP_SYSLOG))))
1107 ptr = NULL;
1108 break;
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001109 case 'N':
1110 switch (fmt[1]) {
1111 case 'F':
1112 return netdev_feature_string(buf, end, ptr, spec);
1113 }
1114 break;
Linus Torvalds0fe1ef22008-07-06 16:43:12 -07001115 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001116 spec.flags |= SMALL;
1117 if (spec.field_width == -1) {
Grant Likely725fe002012-05-31 16:26:08 -07001118 spec.field_width = default_width;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001119 spec.flags |= ZEROPAD;
Linus Torvalds78a8bf62008-07-06 16:16:15 -07001120 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001121 spec.base = 16;
1122
1123 return number(buf, end, (unsigned long) ptr, spec);
1124}
1125
1126/*
1127 * Helper function to decode printf style format.
1128 * Each call decode a token from the format and return the
1129 * number of characters read (or likely the delta where it wants
1130 * to go on the next call).
1131 * The decoded token is returned through the parameters
1132 *
1133 * 'h', 'l', or 'L' for integer fields
1134 * 'z' support added 23/7/1999 S.H.
1135 * 'z' changed to 'Z' --davidm 1/25/99
1136 * 't' added for ptrdiff_t
1137 *
1138 * @fmt: the format string
1139 * @type of the token returned
1140 * @flags: various flags such as +, -, # tokens..
1141 * @field_width: overwritten width
1142 * @base: base of the number (octal, hex, ...)
1143 * @precision: precision of a number
1144 * @qualifier: qualifier of a number (long, size_t, ...)
1145 */
Joe Perchescf3b4292010-05-24 14:33:16 -07001146static noinline_for_stack
1147int format_decode(const char *fmt, struct printf_spec *spec)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001148{
1149 const char *start = fmt;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001150
1151 /* we finished early by reading the field width */
Vegard Nossumed681a92009-03-14 12:08:50 +01001152 if (spec->type == FORMAT_TYPE_WIDTH) {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001153 if (spec->field_width < 0) {
1154 spec->field_width = -spec->field_width;
1155 spec->flags |= LEFT;
1156 }
1157 spec->type = FORMAT_TYPE_NONE;
1158 goto precision;
1159 }
1160
1161 /* we finished early by reading the precision */
1162 if (spec->type == FORMAT_TYPE_PRECISION) {
1163 if (spec->precision < 0)
1164 spec->precision = 0;
1165
1166 spec->type = FORMAT_TYPE_NONE;
1167 goto qualifier;
1168 }
1169
1170 /* By default */
1171 spec->type = FORMAT_TYPE_NONE;
1172
1173 for (; *fmt ; ++fmt) {
1174 if (*fmt == '%')
1175 break;
1176 }
1177
1178 /* Return the current non-format string */
1179 if (fmt != start || !*fmt)
1180 return fmt - start;
1181
1182 /* Process flags */
1183 spec->flags = 0;
1184
1185 while (1) { /* this also skips first '%' */
1186 bool found = true;
1187
1188 ++fmt;
1189
1190 switch (*fmt) {
1191 case '-': spec->flags |= LEFT; break;
1192 case '+': spec->flags |= PLUS; break;
1193 case ' ': spec->flags |= SPACE; break;
1194 case '#': spec->flags |= SPECIAL; break;
1195 case '0': spec->flags |= ZEROPAD; break;
1196 default: found = false;
1197 }
1198
1199 if (!found)
1200 break;
1201 }
1202
1203 /* get field width */
1204 spec->field_width = -1;
1205
1206 if (isdigit(*fmt))
1207 spec->field_width = skip_atoi(&fmt);
1208 else if (*fmt == '*') {
1209 /* it's the next argument */
Vegard Nossumed681a92009-03-14 12:08:50 +01001210 spec->type = FORMAT_TYPE_WIDTH;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001211 return ++fmt - start;
1212 }
1213
1214precision:
1215 /* get the precision */
1216 spec->precision = -1;
1217 if (*fmt == '.') {
1218 ++fmt;
1219 if (isdigit(*fmt)) {
1220 spec->precision = skip_atoi(&fmt);
1221 if (spec->precision < 0)
1222 spec->precision = 0;
1223 } else if (*fmt == '*') {
1224 /* it's the next argument */
Vegard Nossumadf26f82009-03-14 12:08:50 +01001225 spec->type = FORMAT_TYPE_PRECISION;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001226 return ++fmt - start;
1227 }
1228 }
1229
1230qualifier:
1231 /* get the conversion qualifier */
1232 spec->qualifier = -1;
Andy Shevchenko75fb8f22011-07-25 17:13:20 -07001233 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
1234 _tolower(*fmt) == 'z' || *fmt == 't') {
Zhaoleia4e94ef2009-03-27 17:07:05 +08001235 spec->qualifier = *fmt++;
1236 if (unlikely(spec->qualifier == *fmt)) {
1237 if (spec->qualifier == 'l') {
1238 spec->qualifier = 'L';
1239 ++fmt;
1240 } else if (spec->qualifier == 'h') {
1241 spec->qualifier = 'H';
1242 ++fmt;
1243 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001244 }
1245 }
1246
1247 /* default base */
1248 spec->base = 10;
1249 switch (*fmt) {
1250 case 'c':
1251 spec->type = FORMAT_TYPE_CHAR;
1252 return ++fmt - start;
1253
1254 case 's':
1255 spec->type = FORMAT_TYPE_STR;
1256 return ++fmt - start;
1257
1258 case 'p':
1259 spec->type = FORMAT_TYPE_PTR;
1260 return fmt - start;
1261 /* skip alnum */
1262
1263 case 'n':
1264 spec->type = FORMAT_TYPE_NRCHARS;
1265 return ++fmt - start;
1266
1267 case '%':
1268 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1269 return ++fmt - start;
1270
1271 /* integer number formats - set up the flags and "break" */
1272 case 'o':
1273 spec->base = 8;
1274 break;
1275
1276 case 'x':
1277 spec->flags |= SMALL;
1278
1279 case 'X':
1280 spec->base = 16;
1281 break;
1282
1283 case 'd':
1284 case 'i':
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001285 spec->flags |= SIGN;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001286 case 'u':
1287 break;
1288
1289 default:
1290 spec->type = FORMAT_TYPE_INVALID;
1291 return fmt - start;
1292 }
1293
1294 if (spec->qualifier == 'L')
1295 spec->type = FORMAT_TYPE_LONG_LONG;
1296 else if (spec->qualifier == 'l') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001297 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001298 spec->type = FORMAT_TYPE_LONG;
1299 else
1300 spec->type = FORMAT_TYPE_ULONG;
Andy Shevchenko75fb8f22011-07-25 17:13:20 -07001301 } else if (_tolower(spec->qualifier) == 'z') {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001302 spec->type = FORMAT_TYPE_SIZE_T;
1303 } else if (spec->qualifier == 't') {
1304 spec->type = FORMAT_TYPE_PTRDIFF;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001305 } else if (spec->qualifier == 'H') {
1306 if (spec->flags & SIGN)
1307 spec->type = FORMAT_TYPE_BYTE;
1308 else
1309 spec->type = FORMAT_TYPE_UBYTE;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001310 } else if (spec->qualifier == 'h') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001311 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001312 spec->type = FORMAT_TYPE_SHORT;
1313 else
1314 spec->type = FORMAT_TYPE_USHORT;
1315 } else {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001316 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001317 spec->type = FORMAT_TYPE_INT;
1318 else
1319 spec->type = FORMAT_TYPE_UINT;
1320 }
1321
1322 return ++fmt - start;
Linus Torvalds78a8bf62008-07-06 16:16:15 -07001323}
1324
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325/**
1326 * vsnprintf - Format a string and place it in a buffer
1327 * @buf: The buffer to place the result into
1328 * @size: The size of the buffer, including the trailing null space
1329 * @fmt: The format string to use
1330 * @args: Arguments for the format string
1331 *
Andi Kleen20036fd2008-10-15 22:02:02 -07001332 * This function follows C99 vsnprintf, but has some extensions:
Steven Rostedt91adcd22009-09-16 20:03:06 -04001333 * %pS output the name of a text symbol with offset
1334 * %ps output the name of a text symbol without offset
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001335 * %pF output the name of a function pointer with its offset
1336 * %pf output the name of a function pointer without its offset
Namhyung Kim0f77a8d2011-03-24 11:42:29 +09001337 * %pB output the name of a backtrace symbol with its offset
Uwe Kleine-König8a795032009-12-17 15:27:12 -08001338 * %pR output the address range in a struct resource with decoded flags
1339 * %pr output the address range in a struct resource with raw flags
1340 * %pM output a 6-byte MAC address with colons
Andy Shevchenko7c591542012-10-04 17:12:33 -07001341 * %pMR output a 6-byte MAC address with colons in reversed order
1342 * %pMF output a 6-byte MAC address with dashes
Uwe Kleine-König8a795032009-12-17 15:27:12 -08001343 * %pm output a 6-byte MAC address without colons
Andy Shevchenko7c591542012-10-04 17:12:33 -07001344 * %pmR output a 6-byte MAC address without colons in reversed order
Uwe Kleine-König8a795032009-12-17 15:27:12 -08001345 * %pI4 print an IPv4 address without leading zeros
1346 * %pi4 print an IPv4 address with leading zeros
1347 * %pI6 print an IPv6 address with colons
1348 * %pi6 print an IPv6 address without colons
Jan Engelhardtf996f202011-07-14 18:48:56 +02001349 * %pI6c print an IPv6 address as specified by RFC 5952
Uwe Kleine-König8a795032009-12-17 15:27:12 -08001350 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1351 * case.
Andy Shevchenko31550a12012-07-30 14:40:27 -07001352 * %*ph[CDN] a variable-length hex string with a separator (supports up to 64
1353 * bytes of the input)
Steven Rostedt0efb4d22009-09-17 09:27:29 -04001354 * %n is ignored
Andi Kleen20036fd2008-10-15 22:02:02 -07001355 *
Andrew Morton80f548e2012-07-30 14:40:25 -07001356 * ** Please update Documentation/printk-formats.txt when making changes **
1357 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 * The return value is the number of characters which would
1359 * be generated for the given input, excluding the trailing
1360 * '\0', as per ISO C99. If you want to have the exact
1361 * number of characters written into @buf as return value
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001362 * (not including the trailing '\0'), use vscnprintf(). If the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 * return is greater than or equal to @size, the resulting
1364 * string is truncated.
1365 *
Uwe Kleine-Königba1835e2011-04-06 07:49:04 -07001366 * If you're not already dealing with a va_list consider using snprintf().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 */
1368int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1369{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 unsigned long long num;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001371 char *str, *end;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001372 struct printf_spec spec = {0};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001374 /* Reject out-of-range values early. Large positive sizes are
1375 used for unknown buffer sizes. */
Marcin Slusarz2f30b1f92009-09-21 17:04:29 -07001376 if (WARN_ON_ONCE((int) size < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378
1379 str = buf;
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001380 end = buf + size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001382 /* Make sure end is always >= buf */
1383 if (end < buf) {
1384 end = ((void *)-1);
1385 size = end - buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 }
1387
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001388 while (*fmt) {
1389 const char *old_fmt = fmt;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001390 int read = format_decode(fmt, &spec);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001391
1392 fmt += read;
1393
1394 switch (spec.type) {
1395 case FORMAT_TYPE_NONE: {
1396 int copy = read;
1397 if (str < end) {
1398 if (copy > end - str)
1399 copy = end - str;
1400 memcpy(str, old_fmt, copy);
1401 }
1402 str += read;
1403 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 }
1405
Vegard Nossumed681a92009-03-14 12:08:50 +01001406 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001407 spec.field_width = va_arg(args, int);
1408 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001410 case FORMAT_TYPE_PRECISION:
1411 spec.precision = va_arg(args, int);
1412 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
André Goddard Rosad4be1512009-12-14 18:00:59 -08001414 case FORMAT_TYPE_CHAR: {
1415 char c;
1416
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001417 if (!(spec.flags & LEFT)) {
1418 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001419 if (str < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 *str = ' ';
1421 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001422
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001424 }
1425 c = (unsigned char) va_arg(args, int);
1426 if (str < end)
1427 *str = c;
1428 ++str;
1429 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001430 if (str < end)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001431 *str = ' ';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001433 }
1434 break;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001435 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001437 case FORMAT_TYPE_STR:
1438 str = string(str, end, va_arg(args, char *), spec);
1439 break;
1440
1441 case FORMAT_TYPE_PTR:
1442 str = pointer(fmt+1, str, end, va_arg(args, void *),
1443 spec);
1444 while (isalnum(*fmt))
1445 fmt++;
1446 break;
1447
1448 case FORMAT_TYPE_PERCENT_CHAR:
1449 if (str < end)
1450 *str = '%';
1451 ++str;
1452 break;
1453
1454 case FORMAT_TYPE_INVALID:
1455 if (str < end)
1456 *str = '%';
1457 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001458 break;
1459
1460 case FORMAT_TYPE_NRCHARS: {
Joe Perchesef0658f2010-03-06 17:10:14 -08001461 u8 qualifier = spec.qualifier;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001462
1463 if (qualifier == 'l') {
1464 long *ip = va_arg(args, long *);
1465 *ip = (str - buf);
Andy Shevchenko75fb8f22011-07-25 17:13:20 -07001466 } else if (_tolower(qualifier) == 'z') {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001467 size_t *ip = va_arg(args, size_t *);
1468 *ip = (str - buf);
1469 } else {
1470 int *ip = va_arg(args, int *);
1471 *ip = (str - buf);
1472 }
1473 break;
1474 }
1475
1476 default:
1477 switch (spec.type) {
1478 case FORMAT_TYPE_LONG_LONG:
1479 num = va_arg(args, long long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001481 case FORMAT_TYPE_ULONG:
1482 num = va_arg(args, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001484 case FORMAT_TYPE_LONG:
1485 num = va_arg(args, long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001487 case FORMAT_TYPE_SIZE_T:
Jason Gunthorpeef124962012-12-17 15:59:58 -08001488 if (spec.flags & SIGN)
1489 num = va_arg(args, ssize_t);
1490 else
1491 num = va_arg(args, size_t);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001492 break;
1493 case FORMAT_TYPE_PTRDIFF:
1494 num = va_arg(args, ptrdiff_t);
1495 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001496 case FORMAT_TYPE_UBYTE:
1497 num = (unsigned char) va_arg(args, int);
1498 break;
1499 case FORMAT_TYPE_BYTE:
1500 num = (signed char) va_arg(args, int);
1501 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001502 case FORMAT_TYPE_USHORT:
1503 num = (unsigned short) va_arg(args, int);
1504 break;
1505 case FORMAT_TYPE_SHORT:
1506 num = (short) va_arg(args, int);
1507 break;
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001508 case FORMAT_TYPE_INT:
1509 num = (int) va_arg(args, int);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001510 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 default:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001512 num = va_arg(args, unsigned int);
1513 }
1514
1515 str = number(str, end, num, spec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001518
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001519 if (size > 0) {
1520 if (str < end)
1521 *str = '\0';
1522 else
Linus Torvalds0a6047e2006-06-28 17:09:34 -07001523 end[-1] = '\0';
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001524 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001525
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001526 /* the trailing null byte doesn't count towards the total */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 return str-buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001528
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530EXPORT_SYMBOL(vsnprintf);
1531
1532/**
1533 * vscnprintf - Format a string and place it in a buffer
1534 * @buf: The buffer to place the result into
1535 * @size: The size of the buffer, including the trailing null space
1536 * @fmt: The format string to use
1537 * @args: Arguments for the format string
1538 *
1539 * The return value is the number of characters which have been written into
Anton Arapovb921c692011-01-12 16:59:49 -08001540 * the @buf not including the trailing '\0'. If @size is == 0 the function
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 * returns 0.
1542 *
Uwe Kleine-Königba1835e2011-04-06 07:49:04 -07001543 * If you're not already dealing with a va_list consider using scnprintf().
Andi Kleen20036fd2008-10-15 22:02:02 -07001544 *
1545 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 */
1547int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1548{
1549 int i;
1550
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001551 i = vsnprintf(buf, size, fmt, args);
1552
Anton Arapovb921c692011-01-12 16:59:49 -08001553 if (likely(i < size))
1554 return i;
1555 if (size != 0)
1556 return size - 1;
1557 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559EXPORT_SYMBOL(vscnprintf);
1560
1561/**
1562 * snprintf - Format a string and place it in a buffer
1563 * @buf: The buffer to place the result into
1564 * @size: The size of the buffer, including the trailing null space
1565 * @fmt: The format string to use
1566 * @...: Arguments for the format string
1567 *
1568 * The return value is the number of characters which would be
1569 * generated for the given input, excluding the trailing null,
1570 * as per ISO C99. If the return is greater than or equal to
1571 * @size, the resulting string is truncated.
Andi Kleen20036fd2008-10-15 22:02:02 -07001572 *
1573 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001575int snprintf(char *buf, size_t size, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576{
1577 va_list args;
1578 int i;
1579
1580 va_start(args, fmt);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001581 i = vsnprintf(buf, size, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001583
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 return i;
1585}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586EXPORT_SYMBOL(snprintf);
1587
1588/**
1589 * scnprintf - Format a string and place it in a buffer
1590 * @buf: The buffer to place the result into
1591 * @size: The size of the buffer, including the trailing null space
1592 * @fmt: The format string to use
1593 * @...: Arguments for the format string
1594 *
1595 * The return value is the number of characters written into @buf not including
Changli Gaob903c0b2010-10-26 14:22:50 -07001596 * the trailing '\0'. If @size is == 0 the function returns 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 */
1598
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001599int scnprintf(char *buf, size_t size, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600{
1601 va_list args;
1602 int i;
1603
1604 va_start(args, fmt);
Anton Arapovb921c692011-01-12 16:59:49 -08001605 i = vscnprintf(buf, size, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001607
Anton Arapovb921c692011-01-12 16:59:49 -08001608 return i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609}
1610EXPORT_SYMBOL(scnprintf);
1611
1612/**
1613 * vsprintf - Format a string and place it in a buffer
1614 * @buf: The buffer to place the result into
1615 * @fmt: The format string to use
1616 * @args: Arguments for the format string
1617 *
1618 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001619 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 * buffer overflows.
1621 *
Uwe Kleine-Königba1835e2011-04-06 07:49:04 -07001622 * If you're not already dealing with a va_list consider using sprintf().
Andi Kleen20036fd2008-10-15 22:02:02 -07001623 *
1624 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625 */
1626int vsprintf(char *buf, const char *fmt, va_list args)
1627{
1628 return vsnprintf(buf, INT_MAX, fmt, args);
1629}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630EXPORT_SYMBOL(vsprintf);
1631
1632/**
1633 * sprintf - Format a string and place it in a buffer
1634 * @buf: The buffer to place the result into
1635 * @fmt: The format string to use
1636 * @...: Arguments for the format string
1637 *
1638 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001639 * into @buf. Use snprintf() or scnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 * buffer overflows.
Andi Kleen20036fd2008-10-15 22:02:02 -07001641 *
1642 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001644int sprintf(char *buf, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645{
1646 va_list args;
1647 int i;
1648
1649 va_start(args, fmt);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001650 i = vsnprintf(buf, INT_MAX, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001652
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 return i;
1654}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655EXPORT_SYMBOL(sprintf);
1656
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001657#ifdef CONFIG_BINARY_PRINTF
1658/*
1659 * bprintf service:
1660 * vbin_printf() - VA arguments to binary data
1661 * bstr_printf() - Binary data to text string
1662 */
1663
1664/**
1665 * vbin_printf - Parse a format string and place args' binary value in a buffer
1666 * @bin_buf: The buffer to place args' binary value
1667 * @size: The size of the buffer(by words(32bits), not characters)
1668 * @fmt: The format string to use
1669 * @args: Arguments for the format string
1670 *
1671 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1672 * is skiped.
1673 *
1674 * The return value is the number of words(32bits) which would be generated for
1675 * the given input.
1676 *
1677 * NOTE:
1678 * If the return value is greater than @size, the resulting bin_buf is NOT
1679 * valid for bstr_printf().
1680 */
1681int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1682{
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001683 struct printf_spec spec = {0};
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001684 char *str, *end;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001685
1686 str = (char *)bin_buf;
1687 end = (char *)(bin_buf + size);
1688
1689#define save_arg(type) \
1690do { \
1691 if (sizeof(type) == 8) { \
1692 unsigned long long value; \
1693 str = PTR_ALIGN(str, sizeof(u32)); \
1694 value = va_arg(args, unsigned long long); \
1695 if (str + sizeof(type) <= end) { \
1696 *(u32 *)str = *(u32 *)&value; \
1697 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1698 } \
1699 } else { \
1700 unsigned long value; \
1701 str = PTR_ALIGN(str, sizeof(type)); \
1702 value = va_arg(args, int); \
1703 if (str + sizeof(type) <= end) \
1704 *(typeof(type) *)str = (type)value; \
1705 } \
1706 str += sizeof(type); \
1707} while (0)
1708
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001709 while (*fmt) {
André Goddard Rosad4be1512009-12-14 18:00:59 -08001710 int read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001711
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001712 fmt += read;
1713
1714 switch (spec.type) {
1715 case FORMAT_TYPE_NONE:
André Goddard Rosad4be1512009-12-14 18:00:59 -08001716 case FORMAT_TYPE_INVALID:
1717 case FORMAT_TYPE_PERCENT_CHAR:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001718 break;
1719
Vegard Nossumed681a92009-03-14 12:08:50 +01001720 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001721 case FORMAT_TYPE_PRECISION:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001722 save_arg(int);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001723 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001724
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001725 case FORMAT_TYPE_CHAR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001726 save_arg(char);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001727 break;
1728
1729 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001730 const char *save_str = va_arg(args, char *);
1731 size_t len;
André Goddard Rosa6c356632009-12-14 18:00:56 -08001732
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001733 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1734 || (unsigned long)save_str < PAGE_SIZE)
André Goddard Rosa0f4f81d2009-12-14 18:00:55 -08001735 save_str = "(null)";
André Goddard Rosa6c356632009-12-14 18:00:56 -08001736 len = strlen(save_str) + 1;
1737 if (str + len < end)
1738 memcpy(str, save_str, len);
1739 str += len;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001740 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001741 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001742
1743 case FORMAT_TYPE_PTR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001744 save_arg(void *);
1745 /* skip all alphanumeric pointer suffixes */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001746 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001747 fmt++;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001748 break;
1749
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001750 case FORMAT_TYPE_NRCHARS: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001751 /* skip %n 's argument */
Joe Perchesef0658f2010-03-06 17:10:14 -08001752 u8 qualifier = spec.qualifier;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001753 void *skip_arg;
1754 if (qualifier == 'l')
1755 skip_arg = va_arg(args, long *);
Andy Shevchenko75fb8f22011-07-25 17:13:20 -07001756 else if (_tolower(qualifier) == 'z')
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001757 skip_arg = va_arg(args, size_t *);
1758 else
1759 skip_arg = va_arg(args, int *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001760 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001761 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001762
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001763 default:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001764 switch (spec.type) {
1765
1766 case FORMAT_TYPE_LONG_LONG:
1767 save_arg(long long);
1768 break;
1769 case FORMAT_TYPE_ULONG:
1770 case FORMAT_TYPE_LONG:
1771 save_arg(unsigned long);
1772 break;
1773 case FORMAT_TYPE_SIZE_T:
1774 save_arg(size_t);
1775 break;
1776 case FORMAT_TYPE_PTRDIFF:
1777 save_arg(ptrdiff_t);
1778 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001779 case FORMAT_TYPE_UBYTE:
1780 case FORMAT_TYPE_BYTE:
1781 save_arg(char);
1782 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001783 case FORMAT_TYPE_USHORT:
1784 case FORMAT_TYPE_SHORT:
1785 save_arg(short);
1786 break;
1787 default:
1788 save_arg(int);
1789 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001790 }
1791 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001792
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001793 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001794#undef save_arg
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001795}
1796EXPORT_SYMBOL_GPL(vbin_printf);
1797
1798/**
1799 * bstr_printf - Format a string from binary arguments and place it in a buffer
1800 * @buf: The buffer to place the result into
1801 * @size: The size of the buffer, including the trailing null space
1802 * @fmt: The format string to use
1803 * @bin_buf: Binary arguments for the format string
1804 *
1805 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1806 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1807 * a binary buffer that generated by vbin_printf.
1808 *
1809 * The format follows C99 vsnprintf, but has some extensions:
Steven Rostedt0efb4d22009-09-17 09:27:29 -04001810 * see vsnprintf comment for details.
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001811 *
1812 * The return value is the number of characters which would
1813 * be generated for the given input, excluding the trailing
1814 * '\0', as per ISO C99. If you want to have the exact
1815 * number of characters written into @buf as return value
1816 * (not including the trailing '\0'), use vscnprintf(). If the
1817 * return is greater than or equal to @size, the resulting
1818 * string is truncated.
1819 */
1820int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1821{
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001822 struct printf_spec spec = {0};
André Goddard Rosad4be1512009-12-14 18:00:59 -08001823 char *str, *end;
1824 const char *args = (const char *)bin_buf;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001825
Marcin Slusarz2f30b1f92009-09-21 17:04:29 -07001826 if (WARN_ON_ONCE((int) size < 0))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001827 return 0;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001828
1829 str = buf;
1830 end = buf + size;
1831
1832#define get_arg(type) \
1833({ \
1834 typeof(type) value; \
1835 if (sizeof(type) == 8) { \
1836 args = PTR_ALIGN(args, sizeof(u32)); \
1837 *(u32 *)&value = *(u32 *)args; \
1838 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1839 } else { \
1840 args = PTR_ALIGN(args, sizeof(type)); \
1841 value = *(typeof(type) *)args; \
1842 } \
1843 args += sizeof(type); \
1844 value; \
1845})
1846
1847 /* Make sure end is always >= buf */
1848 if (end < buf) {
1849 end = ((void *)-1);
1850 size = end - buf;
1851 }
1852
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001853 while (*fmt) {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001854 const char *old_fmt = fmt;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001855 int read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001856
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001857 fmt += read;
1858
1859 switch (spec.type) {
1860 case FORMAT_TYPE_NONE: {
1861 int copy = read;
1862 if (str < end) {
1863 if (copy > end - str)
1864 copy = end - str;
1865 memcpy(str, old_fmt, copy);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001866 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001867 str += read;
1868 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001869 }
1870
Vegard Nossumed681a92009-03-14 12:08:50 +01001871 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001872 spec.field_width = get_arg(int);
1873 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001874
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001875 case FORMAT_TYPE_PRECISION:
1876 spec.precision = get_arg(int);
1877 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001878
André Goddard Rosad4be1512009-12-14 18:00:59 -08001879 case FORMAT_TYPE_CHAR: {
1880 char c;
1881
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001882 if (!(spec.flags & LEFT)) {
1883 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001884 if (str < end)
1885 *str = ' ';
1886 ++str;
1887 }
1888 }
1889 c = (unsigned char) get_arg(char);
1890 if (str < end)
1891 *str = c;
1892 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001893 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001894 if (str < end)
1895 *str = ' ';
1896 ++str;
1897 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001898 break;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001899 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001900
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001901 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001902 const char *str_arg = args;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001903 args += strlen(str_arg) + 1;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001904 str = string(str, end, (char *)str_arg, spec);
1905 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001906 }
1907
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001908 case FORMAT_TYPE_PTR:
1909 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1910 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001911 fmt++;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001912 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001913
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001914 case FORMAT_TYPE_PERCENT_CHAR:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001915 case FORMAT_TYPE_INVALID:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001916 if (str < end)
1917 *str = '%';
1918 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001919 break;
1920
1921 case FORMAT_TYPE_NRCHARS:
1922 /* skip */
1923 break;
1924
André Goddard Rosad4be1512009-12-14 18:00:59 -08001925 default: {
1926 unsigned long long num;
1927
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001928 switch (spec.type) {
1929
1930 case FORMAT_TYPE_LONG_LONG:
1931 num = get_arg(long long);
1932 break;
1933 case FORMAT_TYPE_ULONG:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001934 case FORMAT_TYPE_LONG:
1935 num = get_arg(unsigned long);
1936 break;
1937 case FORMAT_TYPE_SIZE_T:
1938 num = get_arg(size_t);
1939 break;
1940 case FORMAT_TYPE_PTRDIFF:
1941 num = get_arg(ptrdiff_t);
1942 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001943 case FORMAT_TYPE_UBYTE:
1944 num = get_arg(unsigned char);
1945 break;
1946 case FORMAT_TYPE_BYTE:
1947 num = get_arg(signed char);
1948 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001949 case FORMAT_TYPE_USHORT:
1950 num = get_arg(unsigned short);
1951 break;
1952 case FORMAT_TYPE_SHORT:
1953 num = get_arg(short);
1954 break;
1955 case FORMAT_TYPE_UINT:
1956 num = get_arg(unsigned int);
1957 break;
1958 default:
1959 num = get_arg(int);
1960 }
1961
1962 str = number(str, end, num, spec);
André Goddard Rosad4be1512009-12-14 18:00:59 -08001963 } /* default: */
1964 } /* switch(spec.type) */
1965 } /* while(*fmt) */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001966
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001967 if (size > 0) {
1968 if (str < end)
1969 *str = '\0';
1970 else
1971 end[-1] = '\0';
1972 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001973
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001974#undef get_arg
1975
1976 /* the trailing null byte doesn't count towards the total */
1977 return str - buf;
1978}
1979EXPORT_SYMBOL_GPL(bstr_printf);
1980
1981/**
1982 * bprintf - Parse a format string and place args' binary value in a buffer
1983 * @bin_buf: The buffer to place args' binary value
1984 * @size: The size of the buffer(by words(32bits), not characters)
1985 * @fmt: The format string to use
1986 * @...: Arguments for the format string
1987 *
1988 * The function returns the number of words(u32) written
1989 * into @bin_buf.
1990 */
1991int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1992{
1993 va_list args;
1994 int ret;
1995
1996 va_start(args, fmt);
1997 ret = vbin_printf(bin_buf, size, fmt, args);
1998 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001999
Lai Jiangshan4370aa42009-03-06 17:21:46 +01002000 return ret;
2001}
2002EXPORT_SYMBOL_GPL(bprintf);
2003
2004#endif /* CONFIG_BINARY_PRINTF */
2005
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006/**
2007 * vsscanf - Unformat a buffer into a list of arguments
2008 * @buf: input buffer
2009 * @fmt: format of buffer
2010 * @args: arguments
2011 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002012int vsscanf(const char *buf, const char *fmt, va_list args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013{
2014 const char *str = buf;
2015 char *next;
2016 char digit;
2017 int num = 0;
Joe Perchesef0658f2010-03-06 17:10:14 -08002018 u8 qualifier;
Jan Beulich53809752012-12-17 16:01:31 -08002019 unsigned int base;
2020 union {
2021 long long s;
2022 unsigned long long u;
2023 } val;
Joe Perchesef0658f2010-03-06 17:10:14 -08002024 s16 field_width;
André Goddard Rosad4be1512009-12-14 18:00:59 -08002025 bool is_sign;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026
Jan Beulichda990752012-10-04 17:13:24 -07002027 while (*fmt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028 /* skip any white space in format */
2029 /* white space in format matchs any amount of
2030 * white space, including none, in the input.
2031 */
2032 if (isspace(*fmt)) {
André Goddard Rosae7d28602009-12-14 18:01:06 -08002033 fmt = skip_spaces(++fmt);
2034 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035 }
2036
2037 /* anything that is not a conversion must match exactly */
2038 if (*fmt != '%' && *fmt) {
2039 if (*fmt++ != *str++)
2040 break;
2041 continue;
2042 }
2043
2044 if (!*fmt)
2045 break;
2046 ++fmt;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002047
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048 /* skip this conversion.
2049 * advance both strings to next white space
2050 */
2051 if (*fmt == '*') {
Jan Beulichda990752012-10-04 17:13:24 -07002052 if (!*str)
2053 break;
Andy Spencer8fccae22009-10-01 15:44:27 -07002054 while (!isspace(*fmt) && *fmt != '%' && *fmt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002055 fmt++;
2056 while (!isspace(*str) && *str)
2057 str++;
2058 continue;
2059 }
2060
2061 /* get field width */
2062 field_width = -1;
Jan Beulich53809752012-12-17 16:01:31 -08002063 if (isdigit(*fmt)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064 field_width = skip_atoi(&fmt);
Jan Beulich53809752012-12-17 16:01:31 -08002065 if (field_width <= 0)
2066 break;
2067 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068
2069 /* get conversion qualifier */
2070 qualifier = -1;
Andy Shevchenko75fb8f22011-07-25 17:13:20 -07002071 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2072 _tolower(*fmt) == 'z') {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 qualifier = *fmt++;
2074 if (unlikely(qualifier == *fmt)) {
2075 if (qualifier == 'h') {
2076 qualifier = 'H';
2077 fmt++;
2078 } else if (qualifier == 'l') {
2079 qualifier = 'L';
2080 fmt++;
2081 }
2082 }
2083 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084
Jan Beulichda990752012-10-04 17:13:24 -07002085 if (!*fmt)
2086 break;
2087
2088 if (*fmt == 'n') {
2089 /* return number of characters read so far */
2090 *va_arg(args, int *) = str - buf;
2091 ++fmt;
2092 continue;
2093 }
2094
2095 if (!*str)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096 break;
2097
André Goddard Rosad4be1512009-12-14 18:00:59 -08002098 base = 10;
2099 is_sign = 0;
2100
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002101 switch (*fmt++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 case 'c':
2103 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002104 char *s = (char *)va_arg(args, char*);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 if (field_width == -1)
2106 field_width = 1;
2107 do {
2108 *s++ = *str++;
2109 } while (--field_width > 0 && *str);
2110 num++;
2111 }
2112 continue;
2113 case 's':
2114 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002115 char *s = (char *)va_arg(args, char *);
2116 if (field_width == -1)
Alexey Dobriyan4be929b2010-05-24 14:33:03 -07002117 field_width = SHRT_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118 /* first, skip leading white space in buffer */
André Goddard Rosae7d28602009-12-14 18:01:06 -08002119 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120
2121 /* now copy until next white space */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002122 while (*str && !isspace(*str) && field_width--)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123 *s++ = *str++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 *s = '\0';
2125 num++;
2126 }
2127 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002128 case 'o':
2129 base = 8;
2130 break;
2131 case 'x':
2132 case 'X':
2133 base = 16;
2134 break;
2135 case 'i':
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002136 base = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137 case 'd':
2138 is_sign = 1;
2139 case 'u':
2140 break;
2141 case '%':
2142 /* looking for '%' in str */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002143 if (*str++ != '%')
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144 return num;
2145 continue;
2146 default:
2147 /* invalid format; stop here */
2148 return num;
2149 }
2150
2151 /* have some sort of integer conversion.
2152 * first, skip white space in buffer.
2153 */
André Goddard Rosae7d28602009-12-14 18:01:06 -08002154 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155
2156 digit = *str;
2157 if (is_sign && digit == '-')
2158 digit = *(str + 1);
2159
2160 if (!digit
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002161 || (base == 16 && !isxdigit(digit))
2162 || (base == 10 && !isdigit(digit))
2163 || (base == 8 && (!isdigit(digit) || digit > '7'))
2164 || (base == 0 && !isdigit(digit)))
2165 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166
Jan Beulich53809752012-12-17 16:01:31 -08002167 if (is_sign)
2168 val.s = qualifier != 'L' ?
2169 simple_strtol(str, &next, base) :
2170 simple_strtoll(str, &next, base);
2171 else
2172 val.u = qualifier != 'L' ?
2173 simple_strtoul(str, &next, base) :
2174 simple_strtoull(str, &next, base);
2175
2176 if (field_width > 0 && next - str > field_width) {
2177 if (base == 0)
2178 _parse_integer_fixup_radix(str, &base);
2179 while (next - str > field_width) {
2180 if (is_sign)
2181 val.s = div_s64(val.s, base);
2182 else
2183 val.u = div_u64(val.u, base);
2184 --next;
2185 }
2186 }
2187
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002188 switch (qualifier) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002189 case 'H': /* that's 'hh' in format */
Jan Beulich53809752012-12-17 16:01:31 -08002190 if (is_sign)
2191 *va_arg(args, signed char *) = val.s;
2192 else
2193 *va_arg(args, unsigned char *) = val.u;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194 break;
2195 case 'h':
Jan Beulich53809752012-12-17 16:01:31 -08002196 if (is_sign)
2197 *va_arg(args, short *) = val.s;
2198 else
2199 *va_arg(args, unsigned short *) = val.u;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200 break;
2201 case 'l':
Jan Beulich53809752012-12-17 16:01:31 -08002202 if (is_sign)
2203 *va_arg(args, long *) = val.s;
2204 else
2205 *va_arg(args, unsigned long *) = val.u;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002206 break;
2207 case 'L':
Jan Beulich53809752012-12-17 16:01:31 -08002208 if (is_sign)
2209 *va_arg(args, long long *) = val.s;
2210 else
2211 *va_arg(args, unsigned long long *) = val.u;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212 break;
2213 case 'Z':
2214 case 'z':
Jan Beulich53809752012-12-17 16:01:31 -08002215 *va_arg(args, size_t *) = val.u;
2216 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217 default:
Jan Beulich53809752012-12-17 16:01:31 -08002218 if (is_sign)
2219 *va_arg(args, int *) = val.s;
2220 else
2221 *va_arg(args, unsigned int *) = val.u;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222 break;
2223 }
2224 num++;
2225
2226 if (!next)
2227 break;
2228 str = next;
2229 }
Johannes Bergc6b40d12007-05-08 00:27:20 -07002230
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231 return num;
2232}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002233EXPORT_SYMBOL(vsscanf);
2234
2235/**
2236 * sscanf - Unformat a buffer into a list of arguments
2237 * @buf: input buffer
2238 * @fmt: formatting of buffer
2239 * @...: resulting arguments
2240 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002241int sscanf(const char *buf, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242{
2243 va_list args;
2244 int i;
2245
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002246 va_start(args, fmt);
2247 i = vsscanf(buf, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002249
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250 return i;
2251}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002252EXPORT_SYMBOL(sscanf);