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>
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() */
34 /* Works only for digits and letters, but small and fast */
35 #define TOLOWER(x) ((x) | 0x20)
37 static unsigned int simple_guess_base(const char *cp
)
40 if (TOLOWER(cp
[1]) == 'x' && isxdigit(cp
[2]))
50 * simple_strtoull - convert a string to an unsigned long long
51 * @cp: The start of the string
52 * @endp: A pointer to the end of the parsed string will be placed here
53 * @base: The number base to use
55 unsigned long long simple_strtoull(const char *cp
, char **endp
, unsigned int base
)
57 unsigned long long result
= 0;
60 base
= simple_guess_base(cp
);
62 if (base
== 16 && cp
[0] == '0' && TOLOWER(cp
[1]) == 'x')
65 while (isxdigit(*cp
)) {
68 value
= isdigit(*cp
) ? *cp
- '0' : TOLOWER(*cp
) - 'a' + 10;
71 result
= result
* base
+ value
;
79 EXPORT_SYMBOL(simple_strtoull
);
82 * simple_strtoul - convert a string to an unsigned long
83 * @cp: The start of the string
84 * @endp: A pointer to the end of the parsed string will be placed here
85 * @base: The number base to use
87 unsigned long simple_strtoul(const char *cp
, char **endp
, unsigned int base
)
89 return simple_strtoull(cp
, endp
, base
);
91 EXPORT_SYMBOL(simple_strtoul
);
94 * simple_strtol - convert a string to a signed long
95 * @cp: The start of the string
96 * @endp: A pointer to the end of the parsed string will be placed here
97 * @base: The number base to use
99 long simple_strtol(const char *cp
, char **endp
, unsigned int base
)
102 return -simple_strtoul(cp
+ 1, endp
, base
);
104 return simple_strtoul(cp
, endp
, base
);
106 EXPORT_SYMBOL(simple_strtol
);
109 * simple_strtoll - convert a string to a signed long long
110 * @cp: The start of the string
111 * @endp: A pointer to the end of the parsed string will be placed here
112 * @base: The number base to use
114 long long simple_strtoll(const char *cp
, char **endp
, unsigned int base
)
117 return -simple_strtoull(cp
+ 1, endp
, base
);
119 return simple_strtoull(cp
, endp
, base
);
121 EXPORT_SYMBOL(simple_strtoll
);
123 static noinline_for_stack
124 int skip_atoi(const char **s
)
129 i
= i
*10 + *((*s
)++) - '0';
134 /* Decimal conversion is by far the most typical, and is used
135 * for /proc and /sys data. This directly impacts e.g. top performance
136 * with many processes running. We optimize it for speed
138 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
139 * (with permission from the author, Douglas W. Jones). */
141 /* Formats correctly any integer in [0,99999].
142 * Outputs from one to five digits depending on input.
143 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
144 static noinline_for_stack
145 char *put_dec_trunc(char *buf
, unsigned q
)
147 unsigned d3
, d2
, d1
, d0
;
152 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
153 q
= (d0
* 0xcd) >> 11;
155 *buf
++ = d0
+ '0'; /* least significant digit */
156 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
158 q
= (d1
* 0xcd) >> 11;
160 *buf
++ = d1
+ '0'; /* next digit */
163 if ((d2
!= 0) || (d3
!= 0)) {
166 *buf
++ = d2
+ '0'; /* next digit */
170 q
= (d3
* 0xcd) >> 11;
172 *buf
++ = d3
+ '0'; /* next digit */
174 *buf
++ = q
+ '0'; /* most sign. digit */
181 /* Same with if's removed. Always emits five digits */
182 static noinline_for_stack
183 char *put_dec_full(char *buf
, unsigned q
)
185 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
186 /* but anyway, gcc produces better code with full-sized ints */
187 unsigned d3
, d2
, d1
, d0
;
193 * Possible ways to approx. divide by 10
194 * gcc -O2 replaces multiply with shifts and adds
195 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
196 * (x * 0x67) >> 10: 1100111
197 * (x * 0x34) >> 9: 110100 - same
198 * (x * 0x1a) >> 8: 11010 - same
199 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
201 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
202 q
= (d0
* 0xcd) >> 11;
205 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
206 q
= (d1
* 0xcd) >> 11;
216 q
= (d3
* 0xcd) >> 11; /* - shorter code */
217 /* q = (d3 * 0x67) >> 10; - would also work */
224 /* No inlining helps gcc to use registers better */
225 static noinline_for_stack
226 char *put_dec(char *buf
, unsigned long long num
)
231 return put_dec_trunc(buf
, num
);
232 rem
= do_div(num
, 100000);
233 buf
= put_dec_full(buf
, rem
);
237 #define ZEROPAD 1 /* pad with zero */
238 #define SIGN 2 /* unsigned/signed long */
239 #define PLUS 4 /* show plus */
240 #define SPACE 8 /* space if plus */
241 #define LEFT 16 /* left justified */
242 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
243 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
246 FORMAT_TYPE_NONE
, /* Just a string part */
248 FORMAT_TYPE_PRECISION
,
252 FORMAT_TYPE_PERCENT_CHAR
,
254 FORMAT_TYPE_LONG_LONG
,
269 u8 type
; /* format_type enum */
270 u8 flags
; /* flags to number() */
271 u8 base
; /* number base, 8, 10 or 16 only */
272 u8 qualifier
; /* number qualifier, one of 'hHlLtzZ' */
273 s16 field_width
; /* width of output field */
274 s16 precision
; /* # of digits/chars */
277 static noinline_for_stack
278 char *number(char *buf
, char *end
, unsigned long long num
,
279 struct printf_spec spec
)
281 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
282 static const char digits
[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
287 int need_pfx
= ((spec
.flags
& SPECIAL
) && spec
.base
!= 10);
290 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
291 * produces same digits or (maybe lowercased) letters */
292 locase
= (spec
.flags
& SMALL
);
293 if (spec
.flags
& LEFT
)
294 spec
.flags
&= ~ZEROPAD
;
296 if (spec
.flags
& SIGN
) {
297 if ((signed long long)num
< 0) {
299 num
= -(signed long long)num
;
301 } else if (spec
.flags
& PLUS
) {
304 } else if (spec
.flags
& SPACE
) {
315 /* generate full string in tmp[], in reverse order */
319 /* Generic code, for any base:
321 tmp[i++] = (digits[do_div(num,base)] | locase);
324 else if (spec
.base
!= 10) { /* 8 or 16 */
325 int mask
= spec
.base
- 1;
331 tmp
[i
++] = (digits
[((unsigned char)num
) & mask
] | locase
);
334 } else { /* base 10 */
335 i
= put_dec(tmp
, num
) - tmp
;
338 /* printing 100 using %2d gives "100", not "00" */
339 if (i
> spec
.precision
)
341 /* leading space padding */
342 spec
.field_width
-= spec
.precision
;
343 if (!(spec
.flags
& (ZEROPAD
+LEFT
))) {
344 while (--spec
.field_width
>= 0) {
356 /* "0x" / "0" prefix */
361 if (spec
.base
== 16) {
363 *buf
= ('X' | locase
);
367 /* zero or space padding */
368 if (!(spec
.flags
& LEFT
)) {
369 char c
= (spec
.flags
& ZEROPAD
) ? '0' : ' ';
370 while (--spec
.field_width
>= 0) {
376 /* hmm even more zero padding? */
377 while (i
<= --spec
.precision
) {
382 /* actual digits of result */
388 /* trailing space padding */
389 while (--spec
.field_width
>= 0) {
398 static noinline_for_stack
399 char *string(char *buf
, char *end
, const char *s
, struct printf_spec spec
)
403 if ((unsigned long)s
< PAGE_SIZE
)
406 len
= strnlen(s
, spec
.precision
);
408 if (!(spec
.flags
& LEFT
)) {
409 while (len
< spec
.field_width
--) {
415 for (i
= 0; i
< len
; ++i
) {
420 while (len
< spec
.field_width
--) {
429 static noinline_for_stack
430 char *symbol_string(char *buf
, char *end
, void *ptr
,
431 struct printf_spec spec
, char ext
)
433 unsigned long value
= (unsigned long) ptr
;
434 #ifdef CONFIG_KALLSYMS
435 char sym
[KSYM_SYMBOL_LEN
];
436 if (ext
!= 'f' && ext
!= 's')
437 sprint_symbol(sym
, value
);
439 kallsyms_lookup(value
, NULL
, NULL
, NULL
, sym
);
441 return string(buf
, end
, sym
, spec
);
443 spec
.field_width
= 2 * sizeof(void *);
444 spec
.flags
|= SPECIAL
| SMALL
| ZEROPAD
;
447 return number(buf
, end
, value
, spec
);
451 static noinline_for_stack
452 char *resource_string(char *buf
, char *end
, struct resource
*res
,
453 struct printf_spec spec
, const char *fmt
)
455 #ifndef IO_RSRC_PRINTK_SIZE
456 #define IO_RSRC_PRINTK_SIZE 6
459 #ifndef MEM_RSRC_PRINTK_SIZE
460 #define MEM_RSRC_PRINTK_SIZE 10
462 static const struct printf_spec io_spec
= {
464 .field_width
= IO_RSRC_PRINTK_SIZE
,
466 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
468 static const struct printf_spec mem_spec
= {
470 .field_width
= MEM_RSRC_PRINTK_SIZE
,
472 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
474 static const struct printf_spec bus_spec
= {
478 .flags
= SMALL
| ZEROPAD
,
480 static const struct printf_spec dec_spec
= {
485 static const struct printf_spec str_spec
= {
490 static const struct printf_spec flag_spec
= {
493 .flags
= SPECIAL
| SMALL
,
496 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
497 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
498 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
499 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
500 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
501 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
502 char sym
[max(2*RSRC_BUF_SIZE
+ DECODED_BUF_SIZE
,
503 2*RSRC_BUF_SIZE
+ FLAG_BUF_SIZE
+ RAW_BUF_SIZE
)];
505 char *p
= sym
, *pend
= sym
+ sizeof(sym
);
506 int decode
= (fmt
[0] == 'R') ? 1 : 0;
507 const struct printf_spec
*specp
;
510 if (res
->flags
& IORESOURCE_IO
) {
511 p
= string(p
, pend
, "io ", str_spec
);
513 } else if (res
->flags
& IORESOURCE_MEM
) {
514 p
= string(p
, pend
, "mem ", str_spec
);
516 } else if (res
->flags
& IORESOURCE_IRQ
) {
517 p
= string(p
, pend
, "irq ", str_spec
);
519 } else if (res
->flags
& IORESOURCE_DMA
) {
520 p
= string(p
, pend
, "dma ", str_spec
);
522 } else if (res
->flags
& IORESOURCE_BUS
) {
523 p
= string(p
, pend
, "bus ", str_spec
);
526 p
= string(p
, pend
, "??? ", str_spec
);
530 p
= number(p
, pend
, res
->start
, *specp
);
531 if (res
->start
!= res
->end
) {
533 p
= number(p
, pend
, res
->end
, *specp
);
536 if (res
->flags
& IORESOURCE_MEM_64
)
537 p
= string(p
, pend
, " 64bit", str_spec
);
538 if (res
->flags
& IORESOURCE_PREFETCH
)
539 p
= string(p
, pend
, " pref", str_spec
);
540 if (res
->flags
& IORESOURCE_WINDOW
)
541 p
= string(p
, pend
, " window", str_spec
);
542 if (res
->flags
& IORESOURCE_DISABLED
)
543 p
= string(p
, pend
, " disabled", str_spec
);
545 p
= string(p
, pend
, " flags ", str_spec
);
546 p
= number(p
, pend
, res
->flags
, flag_spec
);
551 return string(buf
, end
, sym
, spec
);
554 static noinline_for_stack
555 char *mac_address_string(char *buf
, char *end
, u8
*addr
,
556 struct printf_spec spec
, const char *fmt
)
558 char mac_addr
[sizeof("xx:xx:xx:xx:xx:xx")];
563 if (fmt
[1] == 'F') { /* FDDI canonical format */
569 for (i
= 0; i
< 6; i
++) {
570 p
= pack_hex_byte(p
, addr
[i
]);
571 if (fmt
[0] == 'M' && i
!= 5)
576 return string(buf
, end
, mac_addr
, spec
);
579 static noinline_for_stack
580 char *ip4_string(char *p
, const u8
*addr
, const char *fmt
)
583 bool leading_zeros
= (fmt
[0] == 'i');
608 for (i
= 0; i
< 4; i
++) {
609 char temp
[3]; /* hold each IP quad in reverse order */
610 int digits
= put_dec_trunc(temp
, addr
[index
]) - temp
;
617 /* reverse the digits in the quad */
629 static noinline_for_stack
630 char *ip6_compressed_string(char *p
, const char *addr
)
633 unsigned char zerolength
[8];
638 bool needcolon
= false;
642 memcpy(&in6
, addr
, sizeof(struct in6_addr
));
644 useIPv4
= ipv6_addr_v4mapped(&in6
) || ipv6_addr_is_isatap(&in6
);
646 memset(zerolength
, 0, sizeof(zerolength
));
653 /* find position of longest 0 run */
654 for (i
= 0; i
< range
; i
++) {
655 for (j
= i
; j
< range
; j
++) {
656 if (in6
.s6_addr16
[j
] != 0)
661 for (i
= 0; i
< range
; i
++) {
662 if (zerolength
[i
] > longest
) {
663 longest
= zerolength
[i
];
669 for (i
= 0; i
< range
; i
++) {
671 if (needcolon
|| i
== 0)
682 /* hex u16 without leading 0s */
683 word
= ntohs(in6
.s6_addr16
[i
]);
688 p
= pack_hex_byte(p
, hi
);
690 *p
++ = hex_asc_lo(hi
);
691 p
= pack_hex_byte(p
, lo
);
694 p
= pack_hex_byte(p
, lo
);
696 *p
++ = hex_asc_lo(lo
);
703 p
= ip4_string(p
, &in6
.s6_addr
[12], "I4");
710 static noinline_for_stack
711 char *ip6_string(char *p
, const char *addr
, const char *fmt
)
715 for (i
= 0; i
< 8; i
++) {
716 p
= pack_hex_byte(p
, *addr
++);
717 p
= pack_hex_byte(p
, *addr
++);
718 if (fmt
[0] == 'I' && i
!= 7)
726 static noinline_for_stack
727 char *ip6_addr_string(char *buf
, char *end
, const u8
*addr
,
728 struct printf_spec spec
, const char *fmt
)
730 char ip6_addr
[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
732 if (fmt
[0] == 'I' && fmt
[2] == 'c')
733 ip6_compressed_string(ip6_addr
, addr
);
735 ip6_string(ip6_addr
, addr
, fmt
);
737 return string(buf
, end
, ip6_addr
, spec
);
740 static noinline_for_stack
741 char *ip4_addr_string(char *buf
, char *end
, const u8
*addr
,
742 struct printf_spec spec
, const char *fmt
)
744 char ip4_addr
[sizeof("255.255.255.255")];
746 ip4_string(ip4_addr
, addr
, fmt
);
748 return string(buf
, end
, ip4_addr
, spec
);
751 static noinline_for_stack
752 char *uuid_string(char *buf
, char *end
, const u8
*addr
,
753 struct printf_spec spec
, const char *fmt
)
755 char uuid
[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
758 static const u8 be
[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
759 static const u8 le
[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
760 const u8
*index
= be
;
765 uc
= true; /* fall-through */
774 for (i
= 0; i
< 16; i
++) {
775 p
= pack_hex_byte(p
, addr
[index
[i
]]);
795 return string(buf
, end
, uuid
, spec
);
798 int kptr_restrict
= 1;
801 * Show a '%p' thing. A kernel extension is that the '%p' is followed
802 * by an extra set of alphanumeric characters that are extended format
805 * Right now we handle:
807 * - 'F' For symbolic function descriptor pointers with offset
808 * - 'f' For simple symbolic function names without offset
809 * - 'S' For symbolic direct pointers with offset
810 * - 's' For symbolic direct pointers without offset
811 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
812 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
813 * - 'M' For a 6-byte MAC address, it prints the address in the
814 * usual colon-separated hex notation
815 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
816 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
817 * with a dash-separated hex notation
818 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
819 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
820 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
821 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
822 * IPv6 omits the colons (01020304...0f)
823 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
824 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
825 * - 'I6c' for IPv6 addresses printed as specified by
826 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
827 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
828 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
829 * Options for %pU are:
830 * b big endian lower case hex (default)
831 * B big endian UPPER case hex
832 * l little endian lower case hex
833 * L little endian UPPER case hex
834 * big endian output byte order is:
835 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
836 * little endian output byte order is:
837 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
838 * - 'V' For a struct va_format which contains a format string * and va_list *,
839 * call vsnprintf(->format, *->va_list).
840 * Implements a "recursive vsnprintf".
841 * Do not use this feature without some mechanism to verify the
842 * correctness of the format string and va_list arguments.
843 * - 'K' For a kernel pointer that should be hidden from unprivileged users
845 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
846 * function pointers are really function descriptors, which contain a
847 * pointer to the real address.
849 static noinline_for_stack
850 char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
851 struct printf_spec spec
)
853 if (!ptr
&& *fmt
!= 'K') {
855 * Print (null) with the same width as a pointer so it makes
856 * tabular output look nice.
858 if (spec
.field_width
== -1)
859 spec
.field_width
= 2 * sizeof(void *);
860 return string(buf
, end
, "(null)", spec
);
866 ptr
= dereference_function_descriptor(ptr
);
870 return symbol_string(buf
, end
, ptr
, spec
, *fmt
);
873 return resource_string(buf
, end
, ptr
, spec
, fmt
);
874 case 'M': /* Colon separated: 00:01:02:03:04:05 */
875 case 'm': /* Contiguous: 000102030405 */
876 /* [mM]F (FDDI, bit reversed) */
877 return mac_address_string(buf
, end
, ptr
, spec
, fmt
);
878 case 'I': /* Formatted IP supported
880 * 6: 0001:0203:...:0708
881 * 6c: 1::708 or 1::1.2.3.4
883 case 'i': /* Contiguous:
889 return ip6_addr_string(buf
, end
, ptr
, spec
, fmt
);
891 return ip4_addr_string(buf
, end
, ptr
, spec
, fmt
);
895 return uuid_string(buf
, end
, ptr
, spec
, fmt
);
897 return buf
+ vsnprintf(buf
, end
- buf
,
898 ((struct va_format
*)ptr
)->fmt
,
899 *(((struct va_format
*)ptr
)->va
));
902 * %pK cannot be used in IRQ context because its test
903 * for CAP_SYSLOG would be meaningless.
905 if (in_irq() || in_serving_softirq() || in_nmi()) {
906 if (spec
.field_width
== -1)
907 spec
.field_width
= 2 * sizeof(void *);
908 return string(buf
, end
, "pK-error", spec
);
910 if (!((kptr_restrict
== 0) ||
911 (kptr_restrict
== 1 &&
912 has_capability_noaudit(current
, CAP_SYSLOG
))))
917 if (spec
.field_width
== -1) {
918 spec
.field_width
= 2 * sizeof(void *);
919 spec
.flags
|= ZEROPAD
;
923 return number(buf
, end
, (unsigned long) ptr
, spec
);
927 * Helper function to decode printf style format.
928 * Each call decode a token from the format and return the
929 * number of characters read (or likely the delta where it wants
930 * to go on the next call).
931 * The decoded token is returned through the parameters
933 * 'h', 'l', or 'L' for integer fields
934 * 'z' support added 23/7/1999 S.H.
935 * 'z' changed to 'Z' --davidm 1/25/99
936 * 't' added for ptrdiff_t
938 * @fmt: the format string
939 * @type of the token returned
940 * @flags: various flags such as +, -, # tokens..
941 * @field_width: overwritten width
942 * @base: base of the number (octal, hex, ...)
943 * @precision: precision of a number
944 * @qualifier: qualifier of a number (long, size_t, ...)
946 static noinline_for_stack
947 int format_decode(const char *fmt
, struct printf_spec
*spec
)
949 const char *start
= fmt
;
951 /* we finished early by reading the field width */
952 if (spec
->type
== FORMAT_TYPE_WIDTH
) {
953 if (spec
->field_width
< 0) {
954 spec
->field_width
= -spec
->field_width
;
957 spec
->type
= FORMAT_TYPE_NONE
;
961 /* we finished early by reading the precision */
962 if (spec
->type
== FORMAT_TYPE_PRECISION
) {
963 if (spec
->precision
< 0)
966 spec
->type
= FORMAT_TYPE_NONE
;
971 spec
->type
= FORMAT_TYPE_NONE
;
973 for (; *fmt
; ++fmt
) {
978 /* Return the current non-format string */
979 if (fmt
!= start
|| !*fmt
)
985 while (1) { /* this also skips first '%' */
991 case '-': spec
->flags
|= LEFT
; break;
992 case '+': spec
->flags
|= PLUS
; break;
993 case ' ': spec
->flags
|= SPACE
; break;
994 case '#': spec
->flags
|= SPECIAL
; break;
995 case '0': spec
->flags
|= ZEROPAD
; break;
996 default: found
= false;
1003 /* get field width */
1004 spec
->field_width
= -1;
1007 spec
->field_width
= skip_atoi(&fmt
);
1008 else if (*fmt
== '*') {
1009 /* it's the next argument */
1010 spec
->type
= FORMAT_TYPE_WIDTH
;
1011 return ++fmt
- start
;
1015 /* get the precision */
1016 spec
->precision
= -1;
1019 if (isdigit(*fmt
)) {
1020 spec
->precision
= skip_atoi(&fmt
);
1021 if (spec
->precision
< 0)
1022 spec
->precision
= 0;
1023 } else if (*fmt
== '*') {
1024 /* it's the next argument */
1025 spec
->type
= FORMAT_TYPE_PRECISION
;
1026 return ++fmt
- start
;
1031 /* get the conversion qualifier */
1032 spec
->qualifier
= -1;
1033 if (*fmt
== 'h' || TOLOWER(*fmt
) == 'l' ||
1034 TOLOWER(*fmt
) == 'z' || *fmt
== 't') {
1035 spec
->qualifier
= *fmt
++;
1036 if (unlikely(spec
->qualifier
== *fmt
)) {
1037 if (spec
->qualifier
== 'l') {
1038 spec
->qualifier
= 'L';
1040 } else if (spec
->qualifier
== 'h') {
1041 spec
->qualifier
= 'H';
1051 spec
->type
= FORMAT_TYPE_CHAR
;
1052 return ++fmt
- start
;
1055 spec
->type
= FORMAT_TYPE_STR
;
1056 return ++fmt
- start
;
1059 spec
->type
= FORMAT_TYPE_PTR
;
1064 spec
->type
= FORMAT_TYPE_NRCHARS
;
1065 return ++fmt
- start
;
1068 spec
->type
= FORMAT_TYPE_PERCENT_CHAR
;
1069 return ++fmt
- start
;
1071 /* integer number formats - set up the flags and "break" */
1077 spec
->flags
|= SMALL
;
1085 spec
->flags
|= SIGN
;
1090 spec
->type
= FORMAT_TYPE_INVALID
;
1094 if (spec
->qualifier
== 'L')
1095 spec
->type
= FORMAT_TYPE_LONG_LONG
;
1096 else if (spec
->qualifier
== 'l') {
1097 if (spec
->flags
& SIGN
)
1098 spec
->type
= FORMAT_TYPE_LONG
;
1100 spec
->type
= FORMAT_TYPE_ULONG
;
1101 } else if (TOLOWER(spec
->qualifier
) == 'z') {
1102 spec
->type
= FORMAT_TYPE_SIZE_T
;
1103 } else if (spec
->qualifier
== 't') {
1104 spec
->type
= FORMAT_TYPE_PTRDIFF
;
1105 } else if (spec
->qualifier
== 'H') {
1106 if (spec
->flags
& SIGN
)
1107 spec
->type
= FORMAT_TYPE_BYTE
;
1109 spec
->type
= FORMAT_TYPE_UBYTE
;
1110 } else if (spec
->qualifier
== 'h') {
1111 if (spec
->flags
& SIGN
)
1112 spec
->type
= FORMAT_TYPE_SHORT
;
1114 spec
->type
= FORMAT_TYPE_USHORT
;
1116 if (spec
->flags
& SIGN
)
1117 spec
->type
= FORMAT_TYPE_INT
;
1119 spec
->type
= FORMAT_TYPE_UINT
;
1122 return ++fmt
- start
;
1126 * vsnprintf - Format a string and place it in a buffer
1127 * @buf: The buffer to place the result into
1128 * @size: The size of the buffer, including the trailing null space
1129 * @fmt: The format string to use
1130 * @args: Arguments for the format string
1132 * This function follows C99 vsnprintf, but has some extensions:
1133 * %pS output the name of a text symbol with offset
1134 * %ps output the name of a text symbol without offset
1135 * %pF output the name of a function pointer with its offset
1136 * %pf output the name of a function pointer without its offset
1137 * %pR output the address range in a struct resource with decoded flags
1138 * %pr output the address range in a struct resource with raw flags
1139 * %pM output a 6-byte MAC address with colons
1140 * %pm output a 6-byte MAC address without colons
1141 * %pI4 print an IPv4 address without leading zeros
1142 * %pi4 print an IPv4 address with leading zeros
1143 * %pI6 print an IPv6 address with colons
1144 * %pi6 print an IPv6 address without colons
1145 * %pI6c print an IPv6 address as specified by
1146 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
1147 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1151 * The return value is the number of characters which would
1152 * be generated for the given input, excluding the trailing
1153 * '\0', as per ISO C99. If you want to have the exact
1154 * number of characters written into @buf as return value
1155 * (not including the trailing '\0'), use vscnprintf(). If the
1156 * return is greater than or equal to @size, the resulting
1157 * string is truncated.
1159 * Call this function if you are already dealing with a va_list.
1160 * You probably want snprintf() instead.
1162 int vsnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1164 unsigned long long num
;
1166 struct printf_spec spec
= {0};
1168 /* Reject out-of-range values early. Large positive sizes are
1169 used for unknown buffer sizes. */
1170 if (WARN_ON_ONCE((int) size
< 0))
1176 /* Make sure end is always >= buf */
1183 const char *old_fmt
= fmt
;
1184 int read
= format_decode(fmt
, &spec
);
1188 switch (spec
.type
) {
1189 case FORMAT_TYPE_NONE
: {
1192 if (copy
> end
- str
)
1194 memcpy(str
, old_fmt
, copy
);
1200 case FORMAT_TYPE_WIDTH
:
1201 spec
.field_width
= va_arg(args
, int);
1204 case FORMAT_TYPE_PRECISION
:
1205 spec
.precision
= va_arg(args
, int);
1208 case FORMAT_TYPE_CHAR
: {
1211 if (!(spec
.flags
& LEFT
)) {
1212 while (--spec
.field_width
> 0) {
1219 c
= (unsigned char) va_arg(args
, int);
1223 while (--spec
.field_width
> 0) {
1231 case FORMAT_TYPE_STR
:
1232 str
= string(str
, end
, va_arg(args
, char *), spec
);
1235 case FORMAT_TYPE_PTR
:
1236 str
= pointer(fmt
+1, str
, end
, va_arg(args
, void *),
1238 while (isalnum(*fmt
))
1242 case FORMAT_TYPE_PERCENT_CHAR
:
1248 case FORMAT_TYPE_INVALID
:
1254 case FORMAT_TYPE_NRCHARS
: {
1255 u8 qualifier
= spec
.qualifier
;
1257 if (qualifier
== 'l') {
1258 long *ip
= va_arg(args
, long *);
1260 } else if (TOLOWER(qualifier
) == 'z') {
1261 size_t *ip
= va_arg(args
, size_t *);
1264 int *ip
= va_arg(args
, int *);
1271 switch (spec
.type
) {
1272 case FORMAT_TYPE_LONG_LONG
:
1273 num
= va_arg(args
, long long);
1275 case FORMAT_TYPE_ULONG
:
1276 num
= va_arg(args
, unsigned long);
1278 case FORMAT_TYPE_LONG
:
1279 num
= va_arg(args
, long);
1281 case FORMAT_TYPE_SIZE_T
:
1282 num
= va_arg(args
, size_t);
1284 case FORMAT_TYPE_PTRDIFF
:
1285 num
= va_arg(args
, ptrdiff_t);
1287 case FORMAT_TYPE_UBYTE
:
1288 num
= (unsigned char) va_arg(args
, int);
1290 case FORMAT_TYPE_BYTE
:
1291 num
= (signed char) va_arg(args
, int);
1293 case FORMAT_TYPE_USHORT
:
1294 num
= (unsigned short) va_arg(args
, int);
1296 case FORMAT_TYPE_SHORT
:
1297 num
= (short) va_arg(args
, int);
1299 case FORMAT_TYPE_INT
:
1300 num
= (int) va_arg(args
, int);
1303 num
= va_arg(args
, unsigned int);
1306 str
= number(str
, end
, num
, spec
);
1317 /* the trailing null byte doesn't count towards the total */
1321 EXPORT_SYMBOL(vsnprintf
);
1324 * vscnprintf - Format a string and place it in a buffer
1325 * @buf: The buffer to place the result into
1326 * @size: The size of the buffer, including the trailing null space
1327 * @fmt: The format string to use
1328 * @args: Arguments for the format string
1330 * The return value is the number of characters which have been written into
1331 * the @buf not including the trailing '\0'. If @size is == 0 the function
1334 * Call this function if you are already dealing with a va_list.
1335 * You probably want scnprintf() instead.
1337 * See the vsnprintf() documentation for format string extensions over C99.
1339 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1343 i
= vsnprintf(buf
, size
, fmt
, args
);
1345 if (likely(i
< size
))
1351 EXPORT_SYMBOL(vscnprintf
);
1354 * snprintf - Format a string and place it in a buffer
1355 * @buf: The buffer to place the result into
1356 * @size: The size of the buffer, including the trailing null space
1357 * @fmt: The format string to use
1358 * @...: Arguments for the format string
1360 * The return value is the number of characters which would be
1361 * generated for the given input, excluding the trailing null,
1362 * as per ISO C99. If the return is greater than or equal to
1363 * @size, the resulting string is truncated.
1365 * See the vsnprintf() documentation for format string extensions over C99.
1367 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
1372 va_start(args
, fmt
);
1373 i
= vsnprintf(buf
, size
, fmt
, args
);
1378 EXPORT_SYMBOL(snprintf
);
1381 * scnprintf - Format a string and place it in a buffer
1382 * @buf: The buffer to place the result into
1383 * @size: The size of the buffer, including the trailing null space
1384 * @fmt: The format string to use
1385 * @...: Arguments for the format string
1387 * The return value is the number of characters written into @buf not including
1388 * the trailing '\0'. If @size is == 0 the function returns 0.
1391 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
1396 va_start(args
, fmt
);
1397 i
= vscnprintf(buf
, size
, fmt
, args
);
1402 EXPORT_SYMBOL(scnprintf
);
1405 * vsprintf - Format a string and place it in a buffer
1406 * @buf: The buffer to place the result into
1407 * @fmt: The format string to use
1408 * @args: Arguments for the format string
1410 * The function returns the number of characters written
1411 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1414 * Call this function if you are already dealing with a va_list.
1415 * You probably want sprintf() instead.
1417 * See the vsnprintf() documentation for format string extensions over C99.
1419 int vsprintf(char *buf
, const char *fmt
, va_list args
)
1421 return vsnprintf(buf
, INT_MAX
, fmt
, args
);
1423 EXPORT_SYMBOL(vsprintf
);
1426 * sprintf - Format a string and place it in a buffer
1427 * @buf: The buffer to place the result into
1428 * @fmt: The format string to use
1429 * @...: Arguments for the format string
1431 * The function returns the number of characters written
1432 * into @buf. Use snprintf() or scnprintf() in order to avoid
1435 * See the vsnprintf() documentation for format string extensions over C99.
1437 int sprintf(char *buf
, const char *fmt
, ...)
1442 va_start(args
, fmt
);
1443 i
= vsnprintf(buf
, INT_MAX
, fmt
, args
);
1448 EXPORT_SYMBOL(sprintf
);
1450 #ifdef CONFIG_BINARY_PRINTF
1453 * vbin_printf() - VA arguments to binary data
1454 * bstr_printf() - Binary data to text string
1458 * vbin_printf - Parse a format string and place args' binary value in a buffer
1459 * @bin_buf: The buffer to place args' binary value
1460 * @size: The size of the buffer(by words(32bits), not characters)
1461 * @fmt: The format string to use
1462 * @args: Arguments for the format string
1464 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1467 * The return value is the number of words(32bits) which would be generated for
1471 * If the return value is greater than @size, the resulting bin_buf is NOT
1472 * valid for bstr_printf().
1474 int vbin_printf(u32
*bin_buf
, size_t size
, const char *fmt
, va_list args
)
1476 struct printf_spec spec
= {0};
1479 str
= (char *)bin_buf
;
1480 end
= (char *)(bin_buf
+ size
);
1482 #define save_arg(type) \
1484 if (sizeof(type) == 8) { \
1485 unsigned long long value; \
1486 str = PTR_ALIGN(str, sizeof(u32)); \
1487 value = va_arg(args, unsigned long long); \
1488 if (str + sizeof(type) <= end) { \
1489 *(u32 *)str = *(u32 *)&value; \
1490 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1493 unsigned long value; \
1494 str = PTR_ALIGN(str, sizeof(type)); \
1495 value = va_arg(args, int); \
1496 if (str + sizeof(type) <= end) \
1497 *(typeof(type) *)str = (type)value; \
1499 str += sizeof(type); \
1503 int read
= format_decode(fmt
, &spec
);
1507 switch (spec
.type
) {
1508 case FORMAT_TYPE_NONE
:
1509 case FORMAT_TYPE_INVALID
:
1510 case FORMAT_TYPE_PERCENT_CHAR
:
1513 case FORMAT_TYPE_WIDTH
:
1514 case FORMAT_TYPE_PRECISION
:
1518 case FORMAT_TYPE_CHAR
:
1522 case FORMAT_TYPE_STR
: {
1523 const char *save_str
= va_arg(args
, char *);
1526 if ((unsigned long)save_str
> (unsigned long)-PAGE_SIZE
1527 || (unsigned long)save_str
< PAGE_SIZE
)
1528 save_str
= "(null)";
1529 len
= strlen(save_str
) + 1;
1530 if (str
+ len
< end
)
1531 memcpy(str
, save_str
, len
);
1536 case FORMAT_TYPE_PTR
:
1538 /* skip all alphanumeric pointer suffixes */
1539 while (isalnum(*fmt
))
1543 case FORMAT_TYPE_NRCHARS
: {
1544 /* skip %n 's argument */
1545 u8 qualifier
= spec
.qualifier
;
1547 if (qualifier
== 'l')
1548 skip_arg
= va_arg(args
, long *);
1549 else if (TOLOWER(qualifier
) == 'z')
1550 skip_arg
= va_arg(args
, size_t *);
1552 skip_arg
= va_arg(args
, int *);
1557 switch (spec
.type
) {
1559 case FORMAT_TYPE_LONG_LONG
:
1560 save_arg(long long);
1562 case FORMAT_TYPE_ULONG
:
1563 case FORMAT_TYPE_LONG
:
1564 save_arg(unsigned long);
1566 case FORMAT_TYPE_SIZE_T
:
1569 case FORMAT_TYPE_PTRDIFF
:
1570 save_arg(ptrdiff_t);
1572 case FORMAT_TYPE_UBYTE
:
1573 case FORMAT_TYPE_BYTE
:
1576 case FORMAT_TYPE_USHORT
:
1577 case FORMAT_TYPE_SHORT
:
1586 return (u32
*)(PTR_ALIGN(str
, sizeof(u32
))) - bin_buf
;
1589 EXPORT_SYMBOL_GPL(vbin_printf
);
1592 * bstr_printf - Format a string from binary arguments and place it in a buffer
1593 * @buf: The buffer to place the result into
1594 * @size: The size of the buffer, including the trailing null space
1595 * @fmt: The format string to use
1596 * @bin_buf: Binary arguments for the format string
1598 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1599 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1600 * a binary buffer that generated by vbin_printf.
1602 * The format follows C99 vsnprintf, but has some extensions:
1603 * see vsnprintf comment for details.
1605 * The return value is the number of characters which would
1606 * be generated for the given input, excluding the trailing
1607 * '\0', as per ISO C99. If you want to have the exact
1608 * number of characters written into @buf as return value
1609 * (not including the trailing '\0'), use vscnprintf(). If the
1610 * return is greater than or equal to @size, the resulting
1611 * string is truncated.
1613 int bstr_printf(char *buf
, size_t size
, const char *fmt
, const u32
*bin_buf
)
1615 struct printf_spec spec
= {0};
1617 const char *args
= (const char *)bin_buf
;
1619 if (WARN_ON_ONCE((int) size
< 0))
1625 #define get_arg(type) \
1627 typeof(type) value; \
1628 if (sizeof(type) == 8) { \
1629 args = PTR_ALIGN(args, sizeof(u32)); \
1630 *(u32 *)&value = *(u32 *)args; \
1631 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1633 args = PTR_ALIGN(args, sizeof(type)); \
1634 value = *(typeof(type) *)args; \
1636 args += sizeof(type); \
1640 /* Make sure end is always >= buf */
1647 const char *old_fmt
= fmt
;
1648 int read
= format_decode(fmt
, &spec
);
1652 switch (spec
.type
) {
1653 case FORMAT_TYPE_NONE
: {
1656 if (copy
> end
- str
)
1658 memcpy(str
, old_fmt
, copy
);
1664 case FORMAT_TYPE_WIDTH
:
1665 spec
.field_width
= get_arg(int);
1668 case FORMAT_TYPE_PRECISION
:
1669 spec
.precision
= get_arg(int);
1672 case FORMAT_TYPE_CHAR
: {
1675 if (!(spec
.flags
& LEFT
)) {
1676 while (--spec
.field_width
> 0) {
1682 c
= (unsigned char) get_arg(char);
1686 while (--spec
.field_width
> 0) {
1694 case FORMAT_TYPE_STR
: {
1695 const char *str_arg
= args
;
1696 args
+= strlen(str_arg
) + 1;
1697 str
= string(str
, end
, (char *)str_arg
, spec
);
1701 case FORMAT_TYPE_PTR
:
1702 str
= pointer(fmt
+1, str
, end
, get_arg(void *), spec
);
1703 while (isalnum(*fmt
))
1707 case FORMAT_TYPE_PERCENT_CHAR
:
1708 case FORMAT_TYPE_INVALID
:
1714 case FORMAT_TYPE_NRCHARS
:
1719 unsigned long long num
;
1721 switch (spec
.type
) {
1723 case FORMAT_TYPE_LONG_LONG
:
1724 num
= get_arg(long long);
1726 case FORMAT_TYPE_ULONG
:
1727 case FORMAT_TYPE_LONG
:
1728 num
= get_arg(unsigned long);
1730 case FORMAT_TYPE_SIZE_T
:
1731 num
= get_arg(size_t);
1733 case FORMAT_TYPE_PTRDIFF
:
1734 num
= get_arg(ptrdiff_t);
1736 case FORMAT_TYPE_UBYTE
:
1737 num
= get_arg(unsigned char);
1739 case FORMAT_TYPE_BYTE
:
1740 num
= get_arg(signed char);
1742 case FORMAT_TYPE_USHORT
:
1743 num
= get_arg(unsigned short);
1745 case FORMAT_TYPE_SHORT
:
1746 num
= get_arg(short);
1748 case FORMAT_TYPE_UINT
:
1749 num
= get_arg(unsigned int);
1755 str
= number(str
, end
, num
, spec
);
1757 } /* switch(spec.type) */
1769 /* the trailing null byte doesn't count towards the total */
1772 EXPORT_SYMBOL_GPL(bstr_printf
);
1775 * bprintf - Parse a format string and place args' binary value in a buffer
1776 * @bin_buf: The buffer to place args' binary value
1777 * @size: The size of the buffer(by words(32bits), not characters)
1778 * @fmt: The format string to use
1779 * @...: Arguments for the format string
1781 * The function returns the number of words(u32) written
1784 int bprintf(u32
*bin_buf
, size_t size
, const char *fmt
, ...)
1789 va_start(args
, fmt
);
1790 ret
= vbin_printf(bin_buf
, size
, fmt
, args
);
1795 EXPORT_SYMBOL_GPL(bprintf
);
1797 #endif /* CONFIG_BINARY_PRINTF */
1800 * vsscanf - Unformat a buffer into a list of arguments
1801 * @buf: input buffer
1802 * @fmt: format of buffer
1805 int vsscanf(const char *buf
, const char *fmt
, va_list args
)
1807 const char *str
= buf
;
1816 while (*fmt
&& *str
) {
1817 /* skip any white space in format */
1818 /* white space in format matchs any amount of
1819 * white space, including none, in the input.
1821 if (isspace(*fmt
)) {
1822 fmt
= skip_spaces(++fmt
);
1823 str
= skip_spaces(str
);
1826 /* anything that is not a conversion must match exactly */
1827 if (*fmt
!= '%' && *fmt
) {
1828 if (*fmt
++ != *str
++)
1837 /* skip this conversion.
1838 * advance both strings to next white space
1841 while (!isspace(*fmt
) && *fmt
!= '%' && *fmt
)
1843 while (!isspace(*str
) && *str
)
1848 /* get field width */
1851 field_width
= skip_atoi(&fmt
);
1853 /* get conversion qualifier */
1855 if (*fmt
== 'h' || TOLOWER(*fmt
) == 'l' ||
1856 TOLOWER(*fmt
) == 'z') {
1858 if (unlikely(qualifier
== *fmt
)) {
1859 if (qualifier
== 'h') {
1862 } else if (qualifier
== 'l') {
1878 char *s
= (char *)va_arg(args
, char*);
1879 if (field_width
== -1)
1883 } while (--field_width
> 0 && *str
);
1889 char *s
= (char *)va_arg(args
, char *);
1890 if (field_width
== -1)
1891 field_width
= SHRT_MAX
;
1892 /* first, skip leading white space in buffer */
1893 str
= skip_spaces(str
);
1895 /* now copy until next white space */
1896 while (*str
&& !isspace(*str
) && field_width
--)
1903 /* return number of characters read so far */
1905 int *i
= (int *)va_arg(args
, int*);
1923 /* looking for '%' in str */
1928 /* invalid format; stop here */
1932 /* have some sort of integer conversion.
1933 * first, skip white space in buffer.
1935 str
= skip_spaces(str
);
1938 if (is_sign
&& digit
== '-')
1942 || (base
== 16 && !isxdigit(digit
))
1943 || (base
== 10 && !isdigit(digit
))
1944 || (base
== 8 && (!isdigit(digit
) || digit
> '7'))
1945 || (base
== 0 && !isdigit(digit
)))
1948 switch (qualifier
) {
1949 case 'H': /* that's 'hh' in format */
1951 signed char *s
= (signed char *)va_arg(args
, signed char *);
1952 *s
= (signed char)simple_strtol(str
, &next
, base
);
1954 unsigned char *s
= (unsigned char *)va_arg(args
, unsigned char *);
1955 *s
= (unsigned char)simple_strtoul(str
, &next
, base
);
1960 short *s
= (short *)va_arg(args
, short *);
1961 *s
= (short)simple_strtol(str
, &next
, base
);
1963 unsigned short *s
= (unsigned short *)va_arg(args
, unsigned short *);
1964 *s
= (unsigned short)simple_strtoul(str
, &next
, base
);
1969 long *l
= (long *)va_arg(args
, long *);
1970 *l
= simple_strtol(str
, &next
, base
);
1972 unsigned long *l
= (unsigned long *)va_arg(args
, unsigned long *);
1973 *l
= simple_strtoul(str
, &next
, base
);
1978 long long *l
= (long long *)va_arg(args
, long long *);
1979 *l
= simple_strtoll(str
, &next
, base
);
1981 unsigned long long *l
= (unsigned long long *)va_arg(args
, unsigned long long *);
1982 *l
= simple_strtoull(str
, &next
, base
);
1988 size_t *s
= (size_t *)va_arg(args
, size_t *);
1989 *s
= (size_t)simple_strtoul(str
, &next
, base
);
1994 int *i
= (int *)va_arg(args
, int *);
1995 *i
= (int)simple_strtol(str
, &next
, base
);
1997 unsigned int *i
= (unsigned int *)va_arg(args
, unsigned int*);
1998 *i
= (unsigned int)simple_strtoul(str
, &next
, base
);
2010 * Now we've come all the way through so either the input string or the
2011 * format ended. In the former case, there can be a %n at the current
2012 * position in the format that needs to be filled.
2014 if (*fmt
== '%' && *(fmt
+ 1) == 'n') {
2015 int *p
= (int *)va_arg(args
, int *);
2021 EXPORT_SYMBOL(vsscanf
);
2024 * sscanf - Unformat a buffer into a list of arguments
2025 * @buf: input buffer
2026 * @fmt: formatting of buffer
2027 * @...: resulting arguments
2029 int sscanf(const char *buf
, const char *fmt
, ...)
2034 va_start(args
, fmt
);
2035 i
= vsscanf(buf
, fmt
, args
);
2040 EXPORT_SYMBOL(sscanf
);