4 * Copyright (C) 1991, 1992 Linus Torvalds
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
13 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
14 * - changed to provide snprintf and vsnprintf functions
15 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
16 * - scnprintf and vscnprintf
20 #include <linux/module.h> /* for KSYM_SYMBOL_LEN */
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/ctype.h>
24 #include <linux/kernel.h>
25 #include <linux/kallsyms.h>
26 #include <linux/uaccess.h>
27 #include <linux/ioport.h>
28 #include <net/addrconf.h>
30 #include <asm/page.h> /* for PAGE_SIZE */
31 #include <asm/div64.h>
32 #include <asm/sections.h> /* for dereference_function_descriptor() */
37 * 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
42 unsigned long long simple_strtoull(const char *cp
, char **endp
, unsigned int base
)
44 unsigned long long result
;
47 cp
= _parse_integer_fixup_radix(cp
, &base
);
48 rv
= _parse_integer(cp
, base
, &result
);
50 cp
+= (rv
& ~KSTRTOX_OVERFLOW
);
57 EXPORT_SYMBOL(simple_strtoull
);
60 * 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
65 unsigned long simple_strtoul(const char *cp
, char **endp
, unsigned int base
)
67 return simple_strtoull(cp
, endp
, base
);
69 EXPORT_SYMBOL(simple_strtoul
);
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
77 long simple_strtol(const char *cp
, char **endp
, unsigned int base
)
80 return -simple_strtoul(cp
+ 1, endp
, base
);
82 return simple_strtoul(cp
, endp
, base
);
84 EXPORT_SYMBOL(simple_strtol
);
87 * 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
92 long long simple_strtoll(const char *cp
, char **endp
, unsigned int base
)
95 return -simple_strtoull(cp
+ 1, endp
, base
);
97 return simple_strtoull(cp
, endp
, base
);
99 EXPORT_SYMBOL(simple_strtoll
);
101 static noinline_for_stack
102 int skip_atoi(const char **s
)
107 i
= i
*10 + *((*s
)++) - '0';
112 /* 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
115 * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
116 * (with permission from the author, Douglas W. Jones).
119 #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
120 /* Formats correctly any integer in [0, 999999999] */
121 static noinline_for_stack
122 char *put_dec_full9(char *buf
, unsigned q
)
127 * Possible ways to approx. divide by 10
128 * (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>
145 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 */
167 /* 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.
171 static noinline_for_stack
172 char *put_dec_trunc8(char *buf
, unsigned r
)
176 /* Copy of previous function's body with added early returns */
177 q
= (r
* (uint64_t)0x1999999a) >> 32;
178 *buf
++ = (r
- 10 * q
) + '0'; /* 2 */
181 r
= (q
* (uint64_t)0x1999999a) >> 32;
182 *buf
++ = (q
- 10 * r
) + '0'; /* 3 */
185 q
= (r
* (uint64_t)0x1999999a) >> 32;
186 *buf
++ = (r
- 10 * q
) + '0'; /* 4 */
189 r
= (q
* (uint64_t)0x1999999a) >> 32;
190 *buf
++ = (q
- 10 * r
) + '0'; /* 5 */
193 q
= (r
* 0x199a) >> 16;
194 *buf
++ = (r
- 10 * q
) + '0'; /* 6 */
197 r
= (q
* 0xcd) >> 11;
198 *buf
++ = (q
- 10 * r
) + '0'; /* 7 */
201 q
= (r
* 0xcd) >> 11;
202 *buf
++ = (r
- 10 * q
) + '0'; /* 8 */
205 *buf
++ = q
+ '0'; /* 9 */
209 /* There are two algorithms to print larger numbers.
210 * One is generic: divide by 1000000000 and repeatedly print
211 * groups of (up to) 9 digits. It's conceptually simple,
212 * but requires a (unsigned long long) / 1000000000 division.
214 * Second algorithm splits 64-bit unsigned long long into 16-bit chunks,
215 * manipulates them cleverly and generates groups of 4 decimal digits.
216 * It so happens that it does NOT require long long division.
218 * If long is > 32 bits, division of 64-bit values is relatively easy,
219 * and we will use the first algorithm.
220 * If long long is > 64 bits (strange architecture with VERY large long long),
221 * second algorithm can't be used, and we again use the first one.
223 * Else (if long is 32 bits and long long is 64 bits) we use second one.
226 #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
228 /* First algorithm: generic */
231 char *put_dec(char *buf
, unsigned long long n
)
233 if (n
>= 100*1000*1000) {
234 while (n
>= 1000*1000*1000)
235 buf
= put_dec_full9(buf
, do_div(n
, 1000*1000*1000));
236 if (n
>= 100*1000*1000)
237 return put_dec_full9(buf
, n
);
239 return put_dec_trunc8(buf
, n
);
244 /* Second algorithm: valid only for 64-bit long longs */
246 static noinline_for_stack
247 char *put_dec_full4(char *buf
, unsigned q
)
250 r
= (q
* 0xcccd) >> 19;
251 *buf
++ = (q
- 10 * r
) + '0';
252 q
= (r
* 0x199a) >> 16;
253 *buf
++ = (r
- 10 * q
) + '0';
254 r
= (q
* 0xcd) >> 11;
255 *buf
++ = (q
- 10 * r
) + '0';
260 /* Based on code by Douglas W. Jones found at
261 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
262 * (with permission from the author).
263 * Performs no 64-bit division and hence should be fast on 32-bit machines.
266 char *put_dec(char *buf
, unsigned long long n
)
268 uint32_t d3
, d2
, d1
, q
, h
;
270 if (n
< 100*1000*1000)
271 return put_dec_trunc8(buf
, n
);
273 d1
= ((uint32_t)n
>> 16); /* implicit "& 0xffff" */
276 d3
= (h
>> 16); /* implicit "& 0xffff" */
278 q
= 656 * d3
+ 7296 * d2
+ 5536 * d1
+ ((uint32_t)n
& 0xffff);
280 buf
= put_dec_full4(buf
, q
% 10000);
283 d1
= q
+ 7671 * d3
+ 9496 * d2
+ 6 * d1
;
284 buf
= put_dec_full4(buf
, d1
% 10000);
287 d2
= q
+ 4749 * d3
+ 42 * d2
;
288 buf
= put_dec_full4(buf
, d2
% 10000);
294 buf
= put_dec_full4(buf
, d3
% 10000);
298 buf
= put_dec_full4(buf
, q
);
300 while (buf
[-1] == '0')
309 * Convert passed number to decimal string.
310 * Returns the length of string. On buffer overflow, returns 0.
312 * If speed is not important, use snprintf(). It's easy to read the code.
314 int num_to_str(char *buf
, int size
, unsigned long long num
)
316 char tmp
[sizeof(num
) * 3];
319 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
324 len
= put_dec(tmp
, num
) - tmp
;
329 for (idx
= 0; idx
< len
; ++idx
)
330 buf
[idx
] = tmp
[len
- idx
- 1];
334 #define ZEROPAD 1 /* pad with zero */
335 #define SIGN 2 /* unsigned/signed long */
336 #define PLUS 4 /* show plus */
337 #define SPACE 8 /* space if plus */
338 #define LEFT 16 /* left justified */
339 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
340 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
343 FORMAT_TYPE_NONE
, /* Just a string part */
345 FORMAT_TYPE_PRECISION
,
349 FORMAT_TYPE_PERCENT_CHAR
,
351 FORMAT_TYPE_LONG_LONG
,
366 u8 type
; /* format_type enum */
367 u8 flags
; /* flags to number() */
368 u8 base
; /* number base, 8, 10 or 16 only */
369 u8 qualifier
; /* number qualifier, one of 'hHlLtzZ' */
370 s16 field_width
; /* width of output field */
371 s16 precision
; /* # of digits/chars */
374 static noinline_for_stack
375 char *number(char *buf
, char *end
, unsigned long long num
,
376 struct printf_spec spec
)
378 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
379 static const char digits
[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
384 int need_pfx
= ((spec
.flags
& SPECIAL
) && spec
.base
!= 10);
386 bool is_zero
= num
== 0LL;
388 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
389 * produces same digits or (maybe lowercased) letters */
390 locase
= (spec
.flags
& SMALL
);
391 if (spec
.flags
& LEFT
)
392 spec
.flags
&= ~ZEROPAD
;
394 if (spec
.flags
& SIGN
) {
395 if ((signed long long)num
< 0) {
397 num
= -(signed long long)num
;
399 } else if (spec
.flags
& PLUS
) {
402 } else if (spec
.flags
& SPACE
) {
409 spec
.field_width
-= 2;
414 /* generate full string in tmp[], in reverse order */
417 tmp
[i
++] = digits
[num
] | locase
;
418 /* Generic code, for any base:
420 tmp[i++] = (digits[do_div(num,base)] | locase);
423 else if (spec
.base
!= 10) { /* 8 or 16 */
424 int mask
= spec
.base
- 1;
430 tmp
[i
++] = (digits
[((unsigned char)num
) & mask
] | locase
);
433 } else { /* base 10 */
434 i
= put_dec(tmp
, num
) - tmp
;
437 /* printing 100 using %2d gives "100", not "00" */
438 if (i
> spec
.precision
)
440 /* leading space padding */
441 spec
.field_width
-= spec
.precision
;
442 if (!(spec
.flags
& (ZEROPAD
+LEFT
))) {
443 while (--spec
.field_width
>= 0) {
455 /* "0x" / "0" prefix */
457 if (spec
.base
== 16 || !is_zero
) {
462 if (spec
.base
== 16) {
464 *buf
= ('X' | locase
);
468 /* zero or space padding */
469 if (!(spec
.flags
& LEFT
)) {
470 char c
= (spec
.flags
& ZEROPAD
) ? '0' : ' ';
471 while (--spec
.field_width
>= 0) {
477 /* hmm even more zero padding? */
478 while (i
<= --spec
.precision
) {
483 /* actual digits of result */
489 /* trailing space padding */
490 while (--spec
.field_width
>= 0) {
499 static noinline_for_stack
500 char *string(char *buf
, char *end
, const char *s
, struct printf_spec spec
)
504 if ((unsigned long)s
< PAGE_SIZE
)
507 len
= strnlen(s
, spec
.precision
);
509 if (!(spec
.flags
& LEFT
)) {
510 while (len
< spec
.field_width
--) {
516 for (i
= 0; i
< len
; ++i
) {
521 while (len
< spec
.field_width
--) {
530 static noinline_for_stack
531 char *symbol_string(char *buf
, char *end
, void *ptr
,
532 struct printf_spec spec
, char ext
)
534 unsigned long value
= (unsigned long) ptr
;
535 #ifdef CONFIG_KALLSYMS
536 char sym
[KSYM_SYMBOL_LEN
];
538 sprint_backtrace(sym
, value
);
539 else if (ext
!= 'f' && ext
!= 's')
540 sprint_symbol(sym
, value
);
542 sprint_symbol_no_offset(sym
, value
);
544 return string(buf
, end
, sym
, spec
);
546 spec
.field_width
= 2 * sizeof(void *);
547 spec
.flags
|= SPECIAL
| SMALL
| ZEROPAD
;
550 return number(buf
, end
, value
, spec
);
554 static noinline_for_stack
555 char *resource_string(char *buf
, char *end
, struct resource
*res
,
556 struct printf_spec spec
, const char *fmt
)
558 #ifndef IO_RSRC_PRINTK_SIZE
559 #define IO_RSRC_PRINTK_SIZE 6
562 #ifndef MEM_RSRC_PRINTK_SIZE
563 #define MEM_RSRC_PRINTK_SIZE 10
565 static const struct printf_spec io_spec
= {
567 .field_width
= IO_RSRC_PRINTK_SIZE
,
569 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
571 static const struct printf_spec mem_spec
= {
573 .field_width
= MEM_RSRC_PRINTK_SIZE
,
575 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
577 static const struct printf_spec bus_spec
= {
581 .flags
= SMALL
| ZEROPAD
,
583 static const struct printf_spec dec_spec
= {
588 static const struct printf_spec str_spec
= {
593 static const struct printf_spec flag_spec
= {
596 .flags
= SPECIAL
| SMALL
,
599 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
600 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
601 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
602 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
603 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
604 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
605 char sym
[max(2*RSRC_BUF_SIZE
+ DECODED_BUF_SIZE
,
606 2*RSRC_BUF_SIZE
+ FLAG_BUF_SIZE
+ RAW_BUF_SIZE
)];
608 char *p
= sym
, *pend
= sym
+ sizeof(sym
);
609 int decode
= (fmt
[0] == 'R') ? 1 : 0;
610 const struct printf_spec
*specp
;
613 if (res
->flags
& IORESOURCE_IO
) {
614 p
= string(p
, pend
, "io ", str_spec
);
616 } else if (res
->flags
& IORESOURCE_MEM
) {
617 p
= string(p
, pend
, "mem ", str_spec
);
619 } else if (res
->flags
& IORESOURCE_IRQ
) {
620 p
= string(p
, pend
, "irq ", str_spec
);
622 } else if (res
->flags
& IORESOURCE_DMA
) {
623 p
= string(p
, pend
, "dma ", str_spec
);
625 } else if (res
->flags
& IORESOURCE_BUS
) {
626 p
= string(p
, pend
, "bus ", str_spec
);
629 p
= string(p
, pend
, "??? ", str_spec
);
633 p
= number(p
, pend
, res
->start
, *specp
);
634 if (res
->start
!= res
->end
) {
636 p
= number(p
, pend
, res
->end
, *specp
);
639 if (res
->flags
& IORESOURCE_MEM_64
)
640 p
= string(p
, pend
, " 64bit", str_spec
);
641 if (res
->flags
& IORESOURCE_PREFETCH
)
642 p
= string(p
, pend
, " pref", str_spec
);
643 if (res
->flags
& IORESOURCE_WINDOW
)
644 p
= string(p
, pend
, " window", str_spec
);
645 if (res
->flags
& IORESOURCE_DISABLED
)
646 p
= string(p
, pend
, " disabled", str_spec
);
648 p
= string(p
, pend
, " flags ", str_spec
);
649 p
= number(p
, pend
, res
->flags
, flag_spec
);
654 return string(buf
, end
, sym
, spec
);
657 static noinline_for_stack
658 char *mac_address_string(char *buf
, char *end
, u8
*addr
,
659 struct printf_spec spec
, const char *fmt
)
661 char mac_addr
[sizeof("xx:xx:xx:xx:xx:xx")];
665 bool reversed
= false;
681 for (i
= 0; i
< 6; i
++) {
683 p
= hex_byte_pack(p
, addr
[5 - i
]);
685 p
= hex_byte_pack(p
, addr
[i
]);
687 if (fmt
[0] == 'M' && i
!= 5)
692 return string(buf
, end
, mac_addr
, spec
);
695 static noinline_for_stack
696 char *ip4_string(char *p
, const u8
*addr
, const char *fmt
)
699 bool leading_zeros
= (fmt
[0] == 'i');
724 for (i
= 0; i
< 4; i
++) {
725 char temp
[3]; /* hold each IP quad in reverse order */
726 int digits
= put_dec_trunc8(temp
, addr
[index
]) - temp
;
733 /* reverse the digits in the quad */
745 static noinline_for_stack
746 char *ip6_compressed_string(char *p
, const char *addr
)
749 unsigned char zerolength
[8];
754 bool needcolon
= false;
758 memcpy(&in6
, addr
, sizeof(struct in6_addr
));
760 useIPv4
= ipv6_addr_v4mapped(&in6
) || ipv6_addr_is_isatap(&in6
);
762 memset(zerolength
, 0, sizeof(zerolength
));
769 /* find position of longest 0 run */
770 for (i
= 0; i
< range
; i
++) {
771 for (j
= i
; j
< range
; j
++) {
772 if (in6
.s6_addr16
[j
] != 0)
777 for (i
= 0; i
< range
; i
++) {
778 if (zerolength
[i
] > longest
) {
779 longest
= zerolength
[i
];
783 if (longest
== 1) /* don't compress a single 0 */
787 for (i
= 0; i
< range
; i
++) {
789 if (needcolon
|| i
== 0)
800 /* hex u16 without leading 0s */
801 word
= ntohs(in6
.s6_addr16
[i
]);
806 p
= hex_byte_pack(p
, hi
);
808 *p
++ = hex_asc_lo(hi
);
809 p
= hex_byte_pack(p
, lo
);
812 p
= hex_byte_pack(p
, lo
);
814 *p
++ = hex_asc_lo(lo
);
821 p
= ip4_string(p
, &in6
.s6_addr
[12], "I4");
828 static noinline_for_stack
829 char *ip6_string(char *p
, const char *addr
, const char *fmt
)
833 for (i
= 0; i
< 8; i
++) {
834 p
= hex_byte_pack(p
, *addr
++);
835 p
= hex_byte_pack(p
, *addr
++);
836 if (fmt
[0] == 'I' && i
!= 7)
844 static noinline_for_stack
845 char *ip6_addr_string(char *buf
, char *end
, const u8
*addr
,
846 struct printf_spec spec
, const char *fmt
)
848 char ip6_addr
[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
850 if (fmt
[0] == 'I' && fmt
[2] == 'c')
851 ip6_compressed_string(ip6_addr
, addr
);
853 ip6_string(ip6_addr
, addr
, fmt
);
855 return string(buf
, end
, ip6_addr
, spec
);
858 static noinline_for_stack
859 char *ip4_addr_string(char *buf
, char *end
, const u8
*addr
,
860 struct printf_spec spec
, const char *fmt
)
862 char ip4_addr
[sizeof("255.255.255.255")];
864 ip4_string(ip4_addr
, addr
, fmt
);
866 return string(buf
, end
, ip4_addr
, spec
);
869 static noinline_for_stack
870 char *uuid_string(char *buf
, char *end
, const u8
*addr
,
871 struct printf_spec spec
, const char *fmt
)
873 char uuid
[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
876 static const u8 be
[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
877 static const u8 le
[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
878 const u8
*index
= be
;
883 uc
= true; /* fall-through */
892 for (i
= 0; i
< 16; i
++) {
893 p
= hex_byte_pack(p
, addr
[index
[i
]]);
913 return string(buf
, end
, uuid
, spec
);
917 char *netdev_feature_string(char *buf
, char *end
, const u8
*addr
,
918 struct printf_spec spec
)
920 spec
.flags
|= SPECIAL
| SMALL
| ZEROPAD
;
921 if (spec
.field_width
== -1)
922 spec
.field_width
= 2 + 2 * sizeof(netdev_features_t
);
925 return number(buf
, end
, *(const netdev_features_t
*)addr
, spec
);
928 int kptr_restrict __read_mostly
;
931 * Show a '%p' thing. A kernel extension is that the '%p' is followed
932 * by an extra set of alphanumeric characters that are extended format
935 * Right now we handle:
937 * - 'F' For symbolic function descriptor pointers with offset
938 * - 'f' For simple symbolic function names without offset
939 * - 'S' For symbolic direct pointers with offset
940 * - 's' For symbolic direct pointers without offset
941 * - 'B' For backtraced symbolic direct pointers with offset
942 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
943 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
944 * - 'M' For a 6-byte MAC address, it prints the address in the
945 * usual colon-separated hex notation
946 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
947 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
948 * with a dash-separated hex notation
949 * - '[mM]R For a 6-byte MAC address, Reverse order (Bluetooth)
950 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
951 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
952 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
953 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
954 * IPv6 omits the colons (01020304...0f)
955 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
956 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
957 * - 'I6c' for IPv6 addresses printed as specified by
958 * http://tools.ietf.org/html/rfc5952
959 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
960 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
961 * Options for %pU are:
962 * b big endian lower case hex (default)
963 * B big endian UPPER case hex
964 * l little endian lower case hex
965 * L little endian UPPER case hex
966 * big endian output byte order is:
967 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
968 * little endian output byte order is:
969 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
970 * - 'V' For a struct va_format which contains a format string * and va_list *,
971 * call vsnprintf(->format, *->va_list).
972 * Implements a "recursive vsnprintf".
973 * Do not use this feature without some mechanism to verify the
974 * correctness of the format string and va_list arguments.
975 * - 'K' For a kernel pointer that should be hidden from unprivileged users
976 * - 'NF' For a netdev_features_t
978 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
979 * function pointers are really function descriptors, which contain a
980 * pointer to the real address.
982 static noinline_for_stack
983 char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
984 struct printf_spec spec
)
986 int default_width
= 2 * sizeof(void *) + (spec
.flags
& SPECIAL
? 2 : 0);
988 if (!ptr
&& *fmt
!= 'K') {
990 * Print (null) with the same width as a pointer so it makes
991 * tabular output look nice.
993 if (spec
.field_width
== -1)
994 spec
.field_width
= default_width
;
995 return string(buf
, end
, "(null)", spec
);
1001 ptr
= dereference_function_descriptor(ptr
);
1006 return symbol_string(buf
, end
, ptr
, spec
, *fmt
);
1009 return resource_string(buf
, end
, ptr
, spec
, fmt
);
1010 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1011 case 'm': /* Contiguous: 000102030405 */
1013 /* [mM]R (Reverse order; Bluetooth) */
1014 return mac_address_string(buf
, end
, ptr
, spec
, fmt
);
1015 case 'I': /* Formatted IP supported
1017 * 6: 0001:0203:...:0708
1018 * 6c: 1::708 or 1::1.2.3.4
1020 case 'i': /* Contiguous:
1021 * 4: 001.002.003.004
1026 return ip6_addr_string(buf
, end
, ptr
, spec
, fmt
);
1028 return ip4_addr_string(buf
, end
, ptr
, spec
, fmt
);
1032 return uuid_string(buf
, end
, ptr
, spec
, fmt
);
1037 va_copy(va
, *((struct va_format
*)ptr
)->va
);
1038 buf
+= vsnprintf(buf
, end
> buf
? end
- buf
: 0,
1039 ((struct va_format
*)ptr
)->fmt
, va
);
1045 * %pK cannot be used in IRQ context because its test
1046 * for CAP_SYSLOG would be meaningless.
1048 if (kptr_restrict
&& (in_irq() || in_serving_softirq() ||
1050 if (spec
.field_width
== -1)
1051 spec
.field_width
= default_width
;
1052 return string(buf
, end
, "pK-error", spec
);
1054 if (!((kptr_restrict
== 0) ||
1055 (kptr_restrict
== 1 &&
1056 has_capability_noaudit(current
, CAP_SYSLOG
))))
1062 return netdev_feature_string(buf
, end
, ptr
, spec
);
1066 spec
.flags
|= SMALL
;
1067 if (spec
.field_width
== -1) {
1068 spec
.field_width
= default_width
;
1069 spec
.flags
|= ZEROPAD
;
1073 return number(buf
, end
, (unsigned long) ptr
, spec
);
1077 * Helper function to decode printf style format.
1078 * Each call decode a token from the format and return the
1079 * number of characters read (or likely the delta where it wants
1080 * to go on the next call).
1081 * The decoded token is returned through the parameters
1083 * 'h', 'l', or 'L' for integer fields
1084 * 'z' support added 23/7/1999 S.H.
1085 * 'z' changed to 'Z' --davidm 1/25/99
1086 * 't' added for ptrdiff_t
1088 * @fmt: the format string
1089 * @type of the token returned
1090 * @flags: various flags such as +, -, # tokens..
1091 * @field_width: overwritten width
1092 * @base: base of the number (octal, hex, ...)
1093 * @precision: precision of a number
1094 * @qualifier: qualifier of a number (long, size_t, ...)
1096 static noinline_for_stack
1097 int format_decode(const char *fmt
, struct printf_spec
*spec
)
1099 const char *start
= fmt
;
1101 /* we finished early by reading the field width */
1102 if (spec
->type
== FORMAT_TYPE_WIDTH
) {
1103 if (spec
->field_width
< 0) {
1104 spec
->field_width
= -spec
->field_width
;
1105 spec
->flags
|= LEFT
;
1107 spec
->type
= FORMAT_TYPE_NONE
;
1111 /* we finished early by reading the precision */
1112 if (spec
->type
== FORMAT_TYPE_PRECISION
) {
1113 if (spec
->precision
< 0)
1114 spec
->precision
= 0;
1116 spec
->type
= FORMAT_TYPE_NONE
;
1121 spec
->type
= FORMAT_TYPE_NONE
;
1123 for (; *fmt
; ++fmt
) {
1128 /* Return the current non-format string */
1129 if (fmt
!= start
|| !*fmt
)
1135 while (1) { /* this also skips first '%' */
1141 case '-': spec
->flags
|= LEFT
; break;
1142 case '+': spec
->flags
|= PLUS
; break;
1143 case ' ': spec
->flags
|= SPACE
; break;
1144 case '#': spec
->flags
|= SPECIAL
; break;
1145 case '0': spec
->flags
|= ZEROPAD
; break;
1146 default: found
= false;
1153 /* get field width */
1154 spec
->field_width
= -1;
1157 spec
->field_width
= skip_atoi(&fmt
);
1158 else if (*fmt
== '*') {
1159 /* it's the next argument */
1160 spec
->type
= FORMAT_TYPE_WIDTH
;
1161 return ++fmt
- start
;
1165 /* get the precision */
1166 spec
->precision
= -1;
1169 if (isdigit(*fmt
)) {
1170 spec
->precision
= skip_atoi(&fmt
);
1171 if (spec
->precision
< 0)
1172 spec
->precision
= 0;
1173 } else if (*fmt
== '*') {
1174 /* it's the next argument */
1175 spec
->type
= FORMAT_TYPE_PRECISION
;
1176 return ++fmt
- start
;
1181 /* get the conversion qualifier */
1182 spec
->qualifier
= -1;
1183 if (*fmt
== 'h' || _tolower(*fmt
) == 'l' ||
1184 _tolower(*fmt
) == 'z' || *fmt
== 't') {
1185 spec
->qualifier
= *fmt
++;
1186 if (unlikely(spec
->qualifier
== *fmt
)) {
1187 if (spec
->qualifier
== 'l') {
1188 spec
->qualifier
= 'L';
1190 } else if (spec
->qualifier
== 'h') {
1191 spec
->qualifier
= 'H';
1201 spec
->type
= FORMAT_TYPE_CHAR
;
1202 return ++fmt
- start
;
1205 spec
->type
= FORMAT_TYPE_STR
;
1206 return ++fmt
- start
;
1209 spec
->type
= FORMAT_TYPE_PTR
;
1214 spec
->type
= FORMAT_TYPE_NRCHARS
;
1215 return ++fmt
- start
;
1218 spec
->type
= FORMAT_TYPE_PERCENT_CHAR
;
1219 return ++fmt
- start
;
1221 /* integer number formats - set up the flags and "break" */
1227 spec
->flags
|= SMALL
;
1235 spec
->flags
|= SIGN
;
1240 spec
->type
= FORMAT_TYPE_INVALID
;
1244 if (spec
->qualifier
== 'L')
1245 spec
->type
= FORMAT_TYPE_LONG_LONG
;
1246 else if (spec
->qualifier
== 'l') {
1247 if (spec
->flags
& SIGN
)
1248 spec
->type
= FORMAT_TYPE_LONG
;
1250 spec
->type
= FORMAT_TYPE_ULONG
;
1251 } else if (_tolower(spec
->qualifier
) == 'z') {
1252 spec
->type
= FORMAT_TYPE_SIZE_T
;
1253 } else if (spec
->qualifier
== 't') {
1254 spec
->type
= FORMAT_TYPE_PTRDIFF
;
1255 } else if (spec
->qualifier
== 'H') {
1256 if (spec
->flags
& SIGN
)
1257 spec
->type
= FORMAT_TYPE_BYTE
;
1259 spec
->type
= FORMAT_TYPE_UBYTE
;
1260 } else if (spec
->qualifier
== 'h') {
1261 if (spec
->flags
& SIGN
)
1262 spec
->type
= FORMAT_TYPE_SHORT
;
1264 spec
->type
= FORMAT_TYPE_USHORT
;
1266 if (spec
->flags
& SIGN
)
1267 spec
->type
= FORMAT_TYPE_INT
;
1269 spec
->type
= FORMAT_TYPE_UINT
;
1272 return ++fmt
- start
;
1276 * vsnprintf - Format a string and place it in a buffer
1277 * @buf: The buffer to place the result into
1278 * @size: The size of the buffer, including the trailing null space
1279 * @fmt: The format string to use
1280 * @args: Arguments for the format string
1282 * This function follows C99 vsnprintf, but has some extensions:
1283 * %pS output the name of a text symbol with offset
1284 * %ps output the name of a text symbol without offset
1285 * %pF output the name of a function pointer with its offset
1286 * %pf output the name of a function pointer without its offset
1287 * %pB output the name of a backtrace symbol with its offset
1288 * %pR output the address range in a struct resource with decoded flags
1289 * %pr output the address range in a struct resource with raw flags
1290 * %pM output a 6-byte MAC address with colons
1291 * %pm output a 6-byte MAC address without colons
1292 * %pI4 print an IPv4 address without leading zeros
1293 * %pi4 print an IPv4 address with leading zeros
1294 * %pI6 print an IPv6 address with colons
1295 * %pi6 print an IPv6 address without colons
1296 * %pI6c print an IPv6 address as specified by RFC 5952
1297 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1301 * ** Please update Documentation/printk-formats.txt when making changes **
1303 * The return value is the number of characters which would
1304 * be generated for the given input, excluding the trailing
1305 * '\0', as per ISO C99. If you want to have the exact
1306 * number of characters written into @buf as return value
1307 * (not including the trailing '\0'), use vscnprintf(). If the
1308 * return is greater than or equal to @size, the resulting
1309 * string is truncated.
1311 * If you're not already dealing with a va_list consider using snprintf().
1313 int vsnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1315 unsigned long long num
;
1317 struct printf_spec spec
= {0};
1319 /* Reject out-of-range values early. Large positive sizes are
1320 used for unknown buffer sizes. */
1321 if (WARN_ON_ONCE((int) size
< 0))
1327 /* Make sure end is always >= buf */
1334 const char *old_fmt
= fmt
;
1335 int read
= format_decode(fmt
, &spec
);
1339 switch (spec
.type
) {
1340 case FORMAT_TYPE_NONE
: {
1343 if (copy
> end
- str
)
1345 memcpy(str
, old_fmt
, copy
);
1351 case FORMAT_TYPE_WIDTH
:
1352 spec
.field_width
= va_arg(args
, int);
1355 case FORMAT_TYPE_PRECISION
:
1356 spec
.precision
= va_arg(args
, int);
1359 case FORMAT_TYPE_CHAR
: {
1362 if (!(spec
.flags
& LEFT
)) {
1363 while (--spec
.field_width
> 0) {
1370 c
= (unsigned char) va_arg(args
, int);
1374 while (--spec
.field_width
> 0) {
1382 case FORMAT_TYPE_STR
:
1383 str
= string(str
, end
, va_arg(args
, char *), spec
);
1386 case FORMAT_TYPE_PTR
:
1387 str
= pointer(fmt
+1, str
, end
, va_arg(args
, void *),
1389 while (isalnum(*fmt
))
1393 case FORMAT_TYPE_PERCENT_CHAR
:
1399 case FORMAT_TYPE_INVALID
:
1405 case FORMAT_TYPE_NRCHARS
: {
1406 u8 qualifier
= spec
.qualifier
;
1408 if (qualifier
== 'l') {
1409 long *ip
= va_arg(args
, long *);
1411 } else if (_tolower(qualifier
) == 'z') {
1412 size_t *ip
= va_arg(args
, size_t *);
1415 int *ip
= va_arg(args
, int *);
1422 switch (spec
.type
) {
1423 case FORMAT_TYPE_LONG_LONG
:
1424 num
= va_arg(args
, long long);
1426 case FORMAT_TYPE_ULONG
:
1427 num
= va_arg(args
, unsigned long);
1429 case FORMAT_TYPE_LONG
:
1430 num
= va_arg(args
, long);
1432 case FORMAT_TYPE_SIZE_T
:
1433 num
= va_arg(args
, size_t);
1435 case FORMAT_TYPE_PTRDIFF
:
1436 num
= va_arg(args
, ptrdiff_t);
1438 case FORMAT_TYPE_UBYTE
:
1439 num
= (unsigned char) va_arg(args
, int);
1441 case FORMAT_TYPE_BYTE
:
1442 num
= (signed char) va_arg(args
, int);
1444 case FORMAT_TYPE_USHORT
:
1445 num
= (unsigned short) va_arg(args
, int);
1447 case FORMAT_TYPE_SHORT
:
1448 num
= (short) va_arg(args
, int);
1450 case FORMAT_TYPE_INT
:
1451 num
= (int) va_arg(args
, int);
1454 num
= va_arg(args
, unsigned int);
1457 str
= number(str
, end
, num
, spec
);
1468 /* the trailing null byte doesn't count towards the total */
1472 EXPORT_SYMBOL(vsnprintf
);
1475 * vscnprintf - Format a string and place it in a buffer
1476 * @buf: The buffer to place the result into
1477 * @size: The size of the buffer, including the trailing null space
1478 * @fmt: The format string to use
1479 * @args: Arguments for the format string
1481 * The return value is the number of characters which have been written into
1482 * the @buf not including the trailing '\0'. If @size is == 0 the function
1485 * If you're not already dealing with a va_list consider using scnprintf().
1487 * See the vsnprintf() documentation for format string extensions over C99.
1489 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1493 i
= vsnprintf(buf
, size
, fmt
, args
);
1495 if (likely(i
< size
))
1501 EXPORT_SYMBOL(vscnprintf
);
1504 * snprintf - Format a string and place it in a buffer
1505 * @buf: The buffer to place the result into
1506 * @size: The size of the buffer, including the trailing null space
1507 * @fmt: The format string to use
1508 * @...: Arguments for the format string
1510 * The return value is the number of characters which would be
1511 * generated for the given input, excluding the trailing null,
1512 * as per ISO C99. If the return is greater than or equal to
1513 * @size, the resulting string is truncated.
1515 * See the vsnprintf() documentation for format string extensions over C99.
1517 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
1522 va_start(args
, fmt
);
1523 i
= vsnprintf(buf
, size
, fmt
, args
);
1528 EXPORT_SYMBOL(snprintf
);
1531 * scnprintf - Format a string and place it in a buffer
1532 * @buf: The buffer to place the result into
1533 * @size: The size of the buffer, including the trailing null space
1534 * @fmt: The format string to use
1535 * @...: Arguments for the format string
1537 * The return value is the number of characters written into @buf not including
1538 * the trailing '\0'. If @size is == 0 the function returns 0.
1541 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
1546 va_start(args
, fmt
);
1547 i
= vscnprintf(buf
, size
, fmt
, args
);
1552 EXPORT_SYMBOL(scnprintf
);
1555 * vsprintf - Format a string and place it in a buffer
1556 * @buf: The buffer to place the result into
1557 * @fmt: The format string to use
1558 * @args: Arguments for the format string
1560 * The function returns the number of characters written
1561 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1564 * If you're not already dealing with a va_list consider using sprintf().
1566 * See the vsnprintf() documentation for format string extensions over C99.
1568 int vsprintf(char *buf
, const char *fmt
, va_list args
)
1570 return vsnprintf(buf
, INT_MAX
, fmt
, args
);
1572 EXPORT_SYMBOL(vsprintf
);
1575 * sprintf - Format a string and place it in a buffer
1576 * @buf: The buffer to place the result into
1577 * @fmt: The format string to use
1578 * @...: Arguments for the format string
1580 * The function returns the number of characters written
1581 * into @buf. Use snprintf() or scnprintf() in order to avoid
1584 * See the vsnprintf() documentation for format string extensions over C99.
1586 int sprintf(char *buf
, const char *fmt
, ...)
1591 va_start(args
, fmt
);
1592 i
= vsnprintf(buf
, INT_MAX
, fmt
, args
);
1597 EXPORT_SYMBOL(sprintf
);
1599 #ifdef CONFIG_BINARY_PRINTF
1602 * vbin_printf() - VA arguments to binary data
1603 * bstr_printf() - Binary data to text string
1607 * vbin_printf - Parse a format string and place args' binary value in a buffer
1608 * @bin_buf: The buffer to place args' binary value
1609 * @size: The size of the buffer(by words(32bits), not characters)
1610 * @fmt: The format string to use
1611 * @args: Arguments for the format string
1613 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1616 * The return value is the number of words(32bits) which would be generated for
1620 * If the return value is greater than @size, the resulting bin_buf is NOT
1621 * valid for bstr_printf().
1623 int vbin_printf(u32
*bin_buf
, size_t size
, const char *fmt
, va_list args
)
1625 struct printf_spec spec
= {0};
1628 str
= (char *)bin_buf
;
1629 end
= (char *)(bin_buf
+ size
);
1631 #define save_arg(type) \
1633 if (sizeof(type) == 8) { \
1634 unsigned long long value; \
1635 str = PTR_ALIGN(str, sizeof(u32)); \
1636 value = va_arg(args, unsigned long long); \
1637 if (str + sizeof(type) <= end) { \
1638 *(u32 *)str = *(u32 *)&value; \
1639 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1642 unsigned long value; \
1643 str = PTR_ALIGN(str, sizeof(type)); \
1644 value = va_arg(args, int); \
1645 if (str + sizeof(type) <= end) \
1646 *(typeof(type) *)str = (type)value; \
1648 str += sizeof(type); \
1652 int read
= format_decode(fmt
, &spec
);
1656 switch (spec
.type
) {
1657 case FORMAT_TYPE_NONE
:
1658 case FORMAT_TYPE_INVALID
:
1659 case FORMAT_TYPE_PERCENT_CHAR
:
1662 case FORMAT_TYPE_WIDTH
:
1663 case FORMAT_TYPE_PRECISION
:
1667 case FORMAT_TYPE_CHAR
:
1671 case FORMAT_TYPE_STR
: {
1672 const char *save_str
= va_arg(args
, char *);
1675 if ((unsigned long)save_str
> (unsigned long)-PAGE_SIZE
1676 || (unsigned long)save_str
< PAGE_SIZE
)
1677 save_str
= "(null)";
1678 len
= strlen(save_str
) + 1;
1679 if (str
+ len
< end
)
1680 memcpy(str
, save_str
, len
);
1685 case FORMAT_TYPE_PTR
:
1687 /* skip all alphanumeric pointer suffixes */
1688 while (isalnum(*fmt
))
1692 case FORMAT_TYPE_NRCHARS
: {
1693 /* skip %n 's argument */
1694 u8 qualifier
= spec
.qualifier
;
1696 if (qualifier
== 'l')
1697 skip_arg
= va_arg(args
, long *);
1698 else if (_tolower(qualifier
) == 'z')
1699 skip_arg
= va_arg(args
, size_t *);
1701 skip_arg
= va_arg(args
, int *);
1706 switch (spec
.type
) {
1708 case FORMAT_TYPE_LONG_LONG
:
1709 save_arg(long long);
1711 case FORMAT_TYPE_ULONG
:
1712 case FORMAT_TYPE_LONG
:
1713 save_arg(unsigned long);
1715 case FORMAT_TYPE_SIZE_T
:
1718 case FORMAT_TYPE_PTRDIFF
:
1719 save_arg(ptrdiff_t);
1721 case FORMAT_TYPE_UBYTE
:
1722 case FORMAT_TYPE_BYTE
:
1725 case FORMAT_TYPE_USHORT
:
1726 case FORMAT_TYPE_SHORT
:
1735 return (u32
*)(PTR_ALIGN(str
, sizeof(u32
))) - bin_buf
;
1738 EXPORT_SYMBOL_GPL(vbin_printf
);
1741 * bstr_printf - Format a string from binary arguments and place it in a buffer
1742 * @buf: The buffer to place the result into
1743 * @size: The size of the buffer, including the trailing null space
1744 * @fmt: The format string to use
1745 * @bin_buf: Binary arguments for the format string
1747 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1748 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1749 * a binary buffer that generated by vbin_printf.
1751 * The format follows C99 vsnprintf, but has some extensions:
1752 * see vsnprintf comment for details.
1754 * The return value is the number of characters which would
1755 * be generated for the given input, excluding the trailing
1756 * '\0', as per ISO C99. If you want to have the exact
1757 * number of characters written into @buf as return value
1758 * (not including the trailing '\0'), use vscnprintf(). If the
1759 * return is greater than or equal to @size, the resulting
1760 * string is truncated.
1762 int bstr_printf(char *buf
, size_t size
, const char *fmt
, const u32
*bin_buf
)
1764 struct printf_spec spec
= {0};
1766 const char *args
= (const char *)bin_buf
;
1768 if (WARN_ON_ONCE((int) size
< 0))
1774 #define get_arg(type) \
1776 typeof(type) value; \
1777 if (sizeof(type) == 8) { \
1778 args = PTR_ALIGN(args, sizeof(u32)); \
1779 *(u32 *)&value = *(u32 *)args; \
1780 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1782 args = PTR_ALIGN(args, sizeof(type)); \
1783 value = *(typeof(type) *)args; \
1785 args += sizeof(type); \
1789 /* Make sure end is always >= buf */
1796 const char *old_fmt
= fmt
;
1797 int read
= format_decode(fmt
, &spec
);
1801 switch (spec
.type
) {
1802 case FORMAT_TYPE_NONE
: {
1805 if (copy
> end
- str
)
1807 memcpy(str
, old_fmt
, copy
);
1813 case FORMAT_TYPE_WIDTH
:
1814 spec
.field_width
= get_arg(int);
1817 case FORMAT_TYPE_PRECISION
:
1818 spec
.precision
= get_arg(int);
1821 case FORMAT_TYPE_CHAR
: {
1824 if (!(spec
.flags
& LEFT
)) {
1825 while (--spec
.field_width
> 0) {
1831 c
= (unsigned char) get_arg(char);
1835 while (--spec
.field_width
> 0) {
1843 case FORMAT_TYPE_STR
: {
1844 const char *str_arg
= args
;
1845 args
+= strlen(str_arg
) + 1;
1846 str
= string(str
, end
, (char *)str_arg
, spec
);
1850 case FORMAT_TYPE_PTR
:
1851 str
= pointer(fmt
+1, str
, end
, get_arg(void *), spec
);
1852 while (isalnum(*fmt
))
1856 case FORMAT_TYPE_PERCENT_CHAR
:
1857 case FORMAT_TYPE_INVALID
:
1863 case FORMAT_TYPE_NRCHARS
:
1868 unsigned long long num
;
1870 switch (spec
.type
) {
1872 case FORMAT_TYPE_LONG_LONG
:
1873 num
= get_arg(long long);
1875 case FORMAT_TYPE_ULONG
:
1876 case FORMAT_TYPE_LONG
:
1877 num
= get_arg(unsigned long);
1879 case FORMAT_TYPE_SIZE_T
:
1880 num
= get_arg(size_t);
1882 case FORMAT_TYPE_PTRDIFF
:
1883 num
= get_arg(ptrdiff_t);
1885 case FORMAT_TYPE_UBYTE
:
1886 num
= get_arg(unsigned char);
1888 case FORMAT_TYPE_BYTE
:
1889 num
= get_arg(signed char);
1891 case FORMAT_TYPE_USHORT
:
1892 num
= get_arg(unsigned short);
1894 case FORMAT_TYPE_SHORT
:
1895 num
= get_arg(short);
1897 case FORMAT_TYPE_UINT
:
1898 num
= get_arg(unsigned int);
1904 str
= number(str
, end
, num
, spec
);
1906 } /* switch(spec.type) */
1918 /* the trailing null byte doesn't count towards the total */
1921 EXPORT_SYMBOL_GPL(bstr_printf
);
1924 * bprintf - Parse a format string and place args' binary value in a buffer
1925 * @bin_buf: The buffer to place args' binary value
1926 * @size: The size of the buffer(by words(32bits), not characters)
1927 * @fmt: The format string to use
1928 * @...: Arguments for the format string
1930 * The function returns the number of words(u32) written
1933 int bprintf(u32
*bin_buf
, size_t size
, const char *fmt
, ...)
1938 va_start(args
, fmt
);
1939 ret
= vbin_printf(bin_buf
, size
, fmt
, args
);
1944 EXPORT_SYMBOL_GPL(bprintf
);
1946 #endif /* CONFIG_BINARY_PRINTF */
1949 * vsscanf - Unformat a buffer into a list of arguments
1950 * @buf: input buffer
1951 * @fmt: format of buffer
1954 int vsscanf(const char *buf
, const char *fmt
, va_list args
)
1956 const char *str
= buf
;
1965 while (*fmt
&& *str
) {
1966 /* skip any white space in format */
1967 /* white space in format matchs any amount of
1968 * white space, including none, in the input.
1970 if (isspace(*fmt
)) {
1971 fmt
= skip_spaces(++fmt
);
1972 str
= skip_spaces(str
);
1975 /* anything that is not a conversion must match exactly */
1976 if (*fmt
!= '%' && *fmt
) {
1977 if (*fmt
++ != *str
++)
1986 /* skip this conversion.
1987 * advance both strings to next white space
1990 while (!isspace(*fmt
) && *fmt
!= '%' && *fmt
)
1992 while (!isspace(*str
) && *str
)
1997 /* get field width */
2000 field_width
= skip_atoi(&fmt
);
2002 /* get conversion qualifier */
2004 if (*fmt
== 'h' || _tolower(*fmt
) == 'l' ||
2005 _tolower(*fmt
) == 'z') {
2007 if (unlikely(qualifier
== *fmt
)) {
2008 if (qualifier
== 'h') {
2011 } else if (qualifier
== 'l') {
2027 char *s
= (char *)va_arg(args
, char*);
2028 if (field_width
== -1)
2032 } while (--field_width
> 0 && *str
);
2038 char *s
= (char *)va_arg(args
, char *);
2039 if (field_width
== -1)
2040 field_width
= SHRT_MAX
;
2041 /* first, skip leading white space in buffer */
2042 str
= skip_spaces(str
);
2044 /* now copy until next white space */
2045 while (*str
&& !isspace(*str
) && field_width
--)
2052 /* return number of characters read so far */
2054 int *i
= (int *)va_arg(args
, int*);
2072 /* looking for '%' in str */
2077 /* invalid format; stop here */
2081 /* have some sort of integer conversion.
2082 * first, skip white space in buffer.
2084 str
= skip_spaces(str
);
2087 if (is_sign
&& digit
== '-')
2091 || (base
== 16 && !isxdigit(digit
))
2092 || (base
== 10 && !isdigit(digit
))
2093 || (base
== 8 && (!isdigit(digit
) || digit
> '7'))
2094 || (base
== 0 && !isdigit(digit
)))
2097 switch (qualifier
) {
2098 case 'H': /* that's 'hh' in format */
2100 signed char *s
= (signed char *)va_arg(args
, signed char *);
2101 *s
= (signed char)simple_strtol(str
, &next
, base
);
2103 unsigned char *s
= (unsigned char *)va_arg(args
, unsigned char *);
2104 *s
= (unsigned char)simple_strtoul(str
, &next
, base
);
2109 short *s
= (short *)va_arg(args
, short *);
2110 *s
= (short)simple_strtol(str
, &next
, base
);
2112 unsigned short *s
= (unsigned short *)va_arg(args
, unsigned short *);
2113 *s
= (unsigned short)simple_strtoul(str
, &next
, base
);
2118 long *l
= (long *)va_arg(args
, long *);
2119 *l
= simple_strtol(str
, &next
, base
);
2121 unsigned long *l
= (unsigned long *)va_arg(args
, unsigned long *);
2122 *l
= simple_strtoul(str
, &next
, base
);
2127 long long *l
= (long long *)va_arg(args
, long long *);
2128 *l
= simple_strtoll(str
, &next
, base
);
2130 unsigned long long *l
= (unsigned long long *)va_arg(args
, unsigned long long *);
2131 *l
= simple_strtoull(str
, &next
, base
);
2137 size_t *s
= (size_t *)va_arg(args
, size_t *);
2138 *s
= (size_t)simple_strtoul(str
, &next
, base
);
2143 int *i
= (int *)va_arg(args
, int *);
2144 *i
= (int)simple_strtol(str
, &next
, base
);
2146 unsigned int *i
= (unsigned int *)va_arg(args
, unsigned int*);
2147 *i
= (unsigned int)simple_strtoul(str
, &next
, base
);
2159 * Now we've come all the way through so either the input string or the
2160 * format ended. In the former case, there can be a %n at the current
2161 * position in the format that needs to be filled.
2163 if (*fmt
== '%' && *(fmt
+ 1) == 'n') {
2164 int *p
= (int *)va_arg(args
, int *);
2170 EXPORT_SYMBOL(vsscanf
);
2173 * sscanf - Unformat a buffer into a list of arguments
2174 * @buf: input buffer
2175 * @fmt: formatting of buffer
2176 * @...: resulting arguments
2178 int sscanf(const char *buf
, const char *fmt
, ...)
2183 va_start(args
, fmt
);
2184 i
= vsscanf(buf
, fmt
, args
);
2189 EXPORT_SYMBOL(sscanf
);