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
);
124 * strict_strtoul - convert a string to an unsigned long strictly
125 * @cp: The string to be converted
126 * @base: The number base to use
127 * @res: The converted result value
129 * strict_strtoul converts a string to an unsigned long only if the
130 * string is really an unsigned long string, any string containing
131 * any invalid char at the tail will be rejected and -EINVAL is returned,
132 * only a newline char at the tail is acceptible because people generally
133 * change a module parameter in the following way:
135 * echo 1024 > /sys/module/e1000/parameters/copybreak
137 * echo will append a newline to the tail.
139 * It returns 0 if conversion is successful and *res is set to the converted
140 * value, otherwise it returns -EINVAL and *res is set to 0.
142 * simple_strtoul just ignores the successive invalid characters and
143 * return the converted value of prefix part of the string.
145 int strict_strtoul(const char *cp
, unsigned int base
, unsigned long *res
)
154 val
= simple_strtoul(cp
, &tail
, base
);
158 if ((tail
[0] == '\0') || (tail
[0] == '\n' && tail
[1] == '\0')) {
165 EXPORT_SYMBOL(strict_strtoul
);
168 * strict_strtol - convert a string to a long strictly
169 * @cp: The string to be converted
170 * @base: The number base to use
171 * @res: The converted result value
173 * strict_strtol is similiar to strict_strtoul, but it allows the first
174 * character of a string is '-'.
176 * It returns 0 if conversion is successful and *res is set to the converted
177 * value, otherwise it returns -EINVAL and *res is set to 0.
179 int strict_strtol(const char *cp
, unsigned int base
, long *res
)
183 ret
= strict_strtoul(cp
+ 1, base
, (unsigned long *)res
);
187 ret
= strict_strtoul(cp
, base
, (unsigned long *)res
);
192 EXPORT_SYMBOL(strict_strtol
);
195 * strict_strtoull - convert a string to an unsigned long long strictly
196 * @cp: The string to be converted
197 * @base: The number base to use
198 * @res: The converted result value
200 * strict_strtoull converts a string to an unsigned long long only if the
201 * string is really an unsigned long long string, any string containing
202 * any invalid char at the tail will be rejected and -EINVAL is returned,
203 * only a newline char at the tail is acceptible because people generally
204 * change a module parameter in the following way:
206 * echo 1024 > /sys/module/e1000/parameters/copybreak
208 * echo will append a newline to the tail of the string.
210 * It returns 0 if conversion is successful and *res is set to the converted
211 * value, otherwise it returns -EINVAL and *res is set to 0.
213 * simple_strtoull just ignores the successive invalid characters and
214 * return the converted value of prefix part of the string.
216 int strict_strtoull(const char *cp
, unsigned int base
, unsigned long long *res
)
219 unsigned long long val
;
225 val
= simple_strtoull(cp
, &tail
, base
);
228 if ((tail
[0] == '\0') || (tail
[0] == '\n' && tail
[1] == '\0')) {
235 EXPORT_SYMBOL(strict_strtoull
);
238 * strict_strtoll - convert a string to a long long strictly
239 * @cp: The string to be converted
240 * @base: The number base to use
241 * @res: The converted result value
243 * strict_strtoll is similiar to strict_strtoull, but it allows the first
244 * character of a string is '-'.
246 * It returns 0 if conversion is successful and *res is set to the converted
247 * value, otherwise it returns -EINVAL and *res is set to 0.
249 int strict_strtoll(const char *cp
, unsigned int base
, long long *res
)
253 ret
= strict_strtoull(cp
+ 1, base
, (unsigned long long *)res
);
257 ret
= strict_strtoull(cp
, base
, (unsigned long long *)res
);
262 EXPORT_SYMBOL(strict_strtoll
);
264 static noinline_for_stack
265 int skip_atoi(const char **s
)
270 i
= i
*10 + *((*s
)++) - '0';
275 /* Decimal conversion is by far the most typical, and is used
276 * for /proc and /sys data. This directly impacts e.g. top performance
277 * with many processes running. We optimize it for speed
279 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
280 * (with permission from the author, Douglas W. Jones). */
282 /* Formats correctly any integer in [0,99999].
283 * Outputs from one to five digits depending on input.
284 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
285 static noinline_for_stack
286 char *put_dec_trunc(char *buf
, unsigned q
)
288 unsigned d3
, d2
, d1
, d0
;
293 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
294 q
= (d0
* 0xcd) >> 11;
296 *buf
++ = d0
+ '0'; /* least significant digit */
297 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
299 q
= (d1
* 0xcd) >> 11;
301 *buf
++ = d1
+ '0'; /* next digit */
304 if ((d2
!= 0) || (d3
!= 0)) {
307 *buf
++ = d2
+ '0'; /* next digit */
311 q
= (d3
* 0xcd) >> 11;
313 *buf
++ = d3
+ '0'; /* next digit */
315 *buf
++ = q
+ '0'; /* most sign. digit */
322 /* Same with if's removed. Always emits five digits */
323 static noinline_for_stack
324 char *put_dec_full(char *buf
, unsigned q
)
326 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
327 /* but anyway, gcc produces better code with full-sized ints */
328 unsigned d3
, d2
, d1
, d0
;
334 * Possible ways to approx. divide by 10
335 * gcc -O2 replaces multiply with shifts and adds
336 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
337 * (x * 0x67) >> 10: 1100111
338 * (x * 0x34) >> 9: 110100 - same
339 * (x * 0x1a) >> 8: 11010 - same
340 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
342 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
343 q
= (d0
* 0xcd) >> 11;
346 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
347 q
= (d1
* 0xcd) >> 11;
357 q
= (d3
* 0xcd) >> 11; /* - shorter code */
358 /* q = (d3 * 0x67) >> 10; - would also work */
365 /* No inlining helps gcc to use registers better */
366 static noinline_for_stack
367 char *put_dec(char *buf
, unsigned long long num
)
372 return put_dec_trunc(buf
, num
);
373 rem
= do_div(num
, 100000);
374 buf
= put_dec_full(buf
, rem
);
378 #define ZEROPAD 1 /* pad with zero */
379 #define SIGN 2 /* unsigned/signed long */
380 #define PLUS 4 /* show plus */
381 #define SPACE 8 /* space if plus */
382 #define LEFT 16 /* left justified */
383 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
384 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
387 FORMAT_TYPE_NONE
, /* Just a string part */
389 FORMAT_TYPE_PRECISION
,
393 FORMAT_TYPE_PERCENT_CHAR
,
395 FORMAT_TYPE_LONG_LONG
,
410 u8 type
; /* format_type enum */
411 u8 flags
; /* flags to number() */
412 u8 base
; /* number base, 8, 10 or 16 only */
413 u8 qualifier
; /* number qualifier, one of 'hHlLtzZ' */
414 s16 field_width
; /* width of output field */
415 s16 precision
; /* # of digits/chars */
418 static noinline_for_stack
419 char *number(char *buf
, char *end
, unsigned long long num
,
420 struct printf_spec spec
)
422 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
423 static const char digits
[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
428 int need_pfx
= ((spec
.flags
& SPECIAL
) && spec
.base
!= 10);
431 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
432 * produces same digits or (maybe lowercased) letters */
433 locase
= (spec
.flags
& SMALL
);
434 if (spec
.flags
& LEFT
)
435 spec
.flags
&= ~ZEROPAD
;
437 if (spec
.flags
& SIGN
) {
438 if ((signed long long)num
< 0) {
440 num
= -(signed long long)num
;
442 } else if (spec
.flags
& PLUS
) {
445 } else if (spec
.flags
& SPACE
) {
456 /* generate full string in tmp[], in reverse order */
460 /* Generic code, for any base:
462 tmp[i++] = (digits[do_div(num,base)] | locase);
465 else if (spec
.base
!= 10) { /* 8 or 16 */
466 int mask
= spec
.base
- 1;
472 tmp
[i
++] = (digits
[((unsigned char)num
) & mask
] | locase
);
475 } else { /* base 10 */
476 i
= put_dec(tmp
, num
) - tmp
;
479 /* printing 100 using %2d gives "100", not "00" */
480 if (i
> spec
.precision
)
482 /* leading space padding */
483 spec
.field_width
-= spec
.precision
;
484 if (!(spec
.flags
& (ZEROPAD
+LEFT
))) {
485 while (--spec
.field_width
>= 0) {
497 /* "0x" / "0" prefix */
502 if (spec
.base
== 16) {
504 *buf
= ('X' | locase
);
508 /* zero or space padding */
509 if (!(spec
.flags
& LEFT
)) {
510 char c
= (spec
.flags
& ZEROPAD
) ? '0' : ' ';
511 while (--spec
.field_width
>= 0) {
517 /* hmm even more zero padding? */
518 while (i
<= --spec
.precision
) {
523 /* actual digits of result */
529 /* trailing space padding */
530 while (--spec
.field_width
>= 0) {
539 static noinline_for_stack
540 char *string(char *buf
, char *end
, const char *s
, struct printf_spec spec
)
544 if ((unsigned long)s
< PAGE_SIZE
)
547 len
= strnlen(s
, spec
.precision
);
549 if (!(spec
.flags
& LEFT
)) {
550 while (len
< spec
.field_width
--) {
556 for (i
= 0; i
< len
; ++i
) {
561 while (len
< spec
.field_width
--) {
570 static noinline_for_stack
571 char *symbol_string(char *buf
, char *end
, void *ptr
,
572 struct printf_spec spec
, char ext
)
574 unsigned long value
= (unsigned long) ptr
;
575 #ifdef CONFIG_KALLSYMS
576 char sym
[KSYM_SYMBOL_LEN
];
577 if (ext
!= 'f' && ext
!= 's')
578 sprint_symbol(sym
, value
);
580 kallsyms_lookup(value
, NULL
, NULL
, NULL
, sym
);
582 return string(buf
, end
, sym
, spec
);
584 spec
.field_width
= 2 * sizeof(void *);
585 spec
.flags
|= SPECIAL
| SMALL
| ZEROPAD
;
588 return number(buf
, end
, value
, spec
);
592 static noinline_for_stack
593 char *resource_string(char *buf
, char *end
, struct resource
*res
,
594 struct printf_spec spec
, const char *fmt
)
596 #ifndef IO_RSRC_PRINTK_SIZE
597 #define IO_RSRC_PRINTK_SIZE 6
600 #ifndef MEM_RSRC_PRINTK_SIZE
601 #define MEM_RSRC_PRINTK_SIZE 10
603 static const struct printf_spec io_spec
= {
605 .field_width
= IO_RSRC_PRINTK_SIZE
,
607 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
609 static const struct printf_spec mem_spec
= {
611 .field_width
= MEM_RSRC_PRINTK_SIZE
,
613 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
615 static const struct printf_spec bus_spec
= {
619 .flags
= SMALL
| ZEROPAD
,
621 static const struct printf_spec dec_spec
= {
626 static const struct printf_spec str_spec
= {
631 static const struct printf_spec flag_spec
= {
634 .flags
= SPECIAL
| SMALL
,
637 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
638 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
639 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
640 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
641 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
642 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
643 char sym
[max(2*RSRC_BUF_SIZE
+ DECODED_BUF_SIZE
,
644 2*RSRC_BUF_SIZE
+ FLAG_BUF_SIZE
+ RAW_BUF_SIZE
)];
646 char *p
= sym
, *pend
= sym
+ sizeof(sym
);
647 int decode
= (fmt
[0] == 'R') ? 1 : 0;
648 const struct printf_spec
*specp
;
651 if (res
->flags
& IORESOURCE_IO
) {
652 p
= string(p
, pend
, "io ", str_spec
);
654 } else if (res
->flags
& IORESOURCE_MEM
) {
655 p
= string(p
, pend
, "mem ", str_spec
);
657 } else if (res
->flags
& IORESOURCE_IRQ
) {
658 p
= string(p
, pend
, "irq ", str_spec
);
660 } else if (res
->flags
& IORESOURCE_DMA
) {
661 p
= string(p
, pend
, "dma ", str_spec
);
663 } else if (res
->flags
& IORESOURCE_BUS
) {
664 p
= string(p
, pend
, "bus ", str_spec
);
667 p
= string(p
, pend
, "??? ", str_spec
);
671 p
= number(p
, pend
, res
->start
, *specp
);
672 if (res
->start
!= res
->end
) {
674 p
= number(p
, pend
, res
->end
, *specp
);
677 if (res
->flags
& IORESOURCE_MEM_64
)
678 p
= string(p
, pend
, " 64bit", str_spec
);
679 if (res
->flags
& IORESOURCE_PREFETCH
)
680 p
= string(p
, pend
, " pref", str_spec
);
681 if (res
->flags
& IORESOURCE_WINDOW
)
682 p
= string(p
, pend
, " window", str_spec
);
683 if (res
->flags
& IORESOURCE_DISABLED
)
684 p
= string(p
, pend
, " disabled", str_spec
);
686 p
= string(p
, pend
, " flags ", str_spec
);
687 p
= number(p
, pend
, res
->flags
, flag_spec
);
692 return string(buf
, end
, sym
, spec
);
695 static noinline_for_stack
696 char *mac_address_string(char *buf
, char *end
, u8
*addr
,
697 struct printf_spec spec
, const char *fmt
)
699 char mac_addr
[sizeof("xx:xx:xx:xx:xx:xx")];
704 if (fmt
[1] == 'F') { /* FDDI canonical format */
710 for (i
= 0; i
< 6; i
++) {
711 p
= pack_hex_byte(p
, addr
[i
]);
712 if (fmt
[0] == 'M' && i
!= 5)
717 return string(buf
, end
, mac_addr
, spec
);
720 static noinline_for_stack
721 char *ip4_string(char *p
, const u8
*addr
, const char *fmt
)
724 bool leading_zeros
= (fmt
[0] == 'i');
749 for (i
= 0; i
< 4; i
++) {
750 char temp
[3]; /* hold each IP quad in reverse order */
751 int digits
= put_dec_trunc(temp
, addr
[index
]) - temp
;
758 /* reverse the digits in the quad */
770 static noinline_for_stack
771 char *ip6_compressed_string(char *p
, const char *addr
)
774 unsigned char zerolength
[8];
779 bool needcolon
= false;
783 memcpy(&in6
, addr
, sizeof(struct in6_addr
));
785 useIPv4
= ipv6_addr_v4mapped(&in6
) || ipv6_addr_is_isatap(&in6
);
787 memset(zerolength
, 0, sizeof(zerolength
));
794 /* find position of longest 0 run */
795 for (i
= 0; i
< range
; i
++) {
796 for (j
= i
; j
< range
; j
++) {
797 if (in6
.s6_addr16
[j
] != 0)
802 for (i
= 0; i
< range
; i
++) {
803 if (zerolength
[i
] > longest
) {
804 longest
= zerolength
[i
];
810 for (i
= 0; i
< range
; i
++) {
812 if (needcolon
|| i
== 0)
823 /* hex u16 without leading 0s */
824 word
= ntohs(in6
.s6_addr16
[i
]);
829 p
= pack_hex_byte(p
, hi
);
831 *p
++ = hex_asc_lo(hi
);
832 p
= pack_hex_byte(p
, lo
);
835 p
= pack_hex_byte(p
, lo
);
837 *p
++ = hex_asc_lo(lo
);
844 p
= ip4_string(p
, &in6
.s6_addr
[12], "I4");
851 static noinline_for_stack
852 char *ip6_string(char *p
, const char *addr
, const char *fmt
)
856 for (i
= 0; i
< 8; i
++) {
857 p
= pack_hex_byte(p
, *addr
++);
858 p
= pack_hex_byte(p
, *addr
++);
859 if (fmt
[0] == 'I' && i
!= 7)
867 static noinline_for_stack
868 char *ip6_addr_string(char *buf
, char *end
, const u8
*addr
,
869 struct printf_spec spec
, const char *fmt
)
871 char ip6_addr
[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
873 if (fmt
[0] == 'I' && fmt
[2] == 'c')
874 ip6_compressed_string(ip6_addr
, addr
);
876 ip6_string(ip6_addr
, addr
, fmt
);
878 return string(buf
, end
, ip6_addr
, spec
);
881 static noinline_for_stack
882 char *ip4_addr_string(char *buf
, char *end
, const u8
*addr
,
883 struct printf_spec spec
, const char *fmt
)
885 char ip4_addr
[sizeof("255.255.255.255")];
887 ip4_string(ip4_addr
, addr
, fmt
);
889 return string(buf
, end
, ip4_addr
, spec
);
892 static noinline_for_stack
893 char *uuid_string(char *buf
, char *end
, const u8
*addr
,
894 struct printf_spec spec
, const char *fmt
)
896 char uuid
[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
899 static const u8 be
[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
900 static const u8 le
[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
901 const u8
*index
= be
;
906 uc
= true; /* fall-through */
915 for (i
= 0; i
< 16; i
++) {
916 p
= pack_hex_byte(p
, addr
[index
[i
]]);
936 return string(buf
, end
, uuid
, spec
);
939 int kptr_restrict
= 1;
942 * Show a '%p' thing. A kernel extension is that the '%p' is followed
943 * by an extra set of alphanumeric characters that are extended format
946 * Right now we handle:
948 * - 'F' For symbolic function descriptor pointers with offset
949 * - 'f' For simple symbolic function names without offset
950 * - 'S' For symbolic direct pointers with offset
951 * - 's' For symbolic direct pointers without offset
952 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
953 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
954 * - 'M' For a 6-byte MAC address, it prints the address in the
955 * usual colon-separated hex notation
956 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
957 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
958 * with a dash-separated hex notation
959 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
960 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
961 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
962 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
963 * IPv6 omits the colons (01020304...0f)
964 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
965 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
966 * - 'I6c' for IPv6 addresses printed as specified by
967 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
968 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
969 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
970 * Options for %pU are:
971 * b big endian lower case hex (default)
972 * B big endian UPPER case hex
973 * l little endian lower case hex
974 * L little endian UPPER case hex
975 * big endian output byte order is:
976 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
977 * little endian output byte order is:
978 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
979 * - 'V' For a struct va_format which contains a format string * and va_list *,
980 * call vsnprintf(->format, *->va_list).
981 * Implements a "recursive vsnprintf".
982 * Do not use this feature without some mechanism to verify the
983 * correctness of the format string and va_list arguments.
984 * - 'K' For a kernel pointer that should be hidden from unprivileged users
986 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
987 * function pointers are really function descriptors, which contain a
988 * pointer to the real address.
990 static noinline_for_stack
991 char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
992 struct printf_spec spec
)
996 * Print (null) with the same width as a pointer so it makes
997 * tabular output look nice.
999 if (spec
.field_width
== -1)
1000 spec
.field_width
= 2 * sizeof(void *);
1001 return string(buf
, end
, "(null)", spec
);
1007 ptr
= dereference_function_descriptor(ptr
);
1011 return symbol_string(buf
, end
, ptr
, spec
, *fmt
);
1014 return resource_string(buf
, end
, ptr
, spec
, fmt
);
1015 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1016 case 'm': /* Contiguous: 000102030405 */
1017 /* [mM]F (FDDI, bit reversed) */
1018 return mac_address_string(buf
, end
, ptr
, spec
, fmt
);
1019 case 'I': /* Formatted IP supported
1021 * 6: 0001:0203:...:0708
1022 * 6c: 1::708 or 1::1.2.3.4
1024 case 'i': /* Contiguous:
1025 * 4: 001.002.003.004
1030 return ip6_addr_string(buf
, end
, ptr
, spec
, fmt
);
1032 return ip4_addr_string(buf
, end
, ptr
, spec
, fmt
);
1036 return uuid_string(buf
, end
, ptr
, spec
, fmt
);
1038 return buf
+ vsnprintf(buf
, end
- buf
,
1039 ((struct va_format
*)ptr
)->fmt
,
1040 *(((struct va_format
*)ptr
)->va
));
1043 * %pK cannot be used in IRQ context because its test
1044 * for CAP_SYSLOG would be meaningless.
1046 if (in_irq() || in_serving_softirq() || in_nmi()) {
1047 if (spec
.field_width
== -1)
1048 spec
.field_width
= 2 * sizeof(void *);
1049 return string(buf
, end
, "pK-error", spec
);
1050 } else if ((kptr_restrict
== 0) ||
1051 (kptr_restrict
== 1 &&
1052 has_capability_noaudit(current
, CAP_SYSLOG
)))
1055 if (spec
.field_width
== -1) {
1056 spec
.field_width
= 2 * sizeof(void *);
1057 spec
.flags
|= ZEROPAD
;
1059 return number(buf
, end
, 0, spec
);
1061 spec
.flags
|= SMALL
;
1062 if (spec
.field_width
== -1) {
1063 spec
.field_width
= 2 * sizeof(void *);
1064 spec
.flags
|= ZEROPAD
;
1068 return number(buf
, end
, (unsigned long) ptr
, spec
);
1072 * Helper function to decode printf style format.
1073 * Each call decode a token from the format and return the
1074 * number of characters read (or likely the delta where it wants
1075 * to go on the next call).
1076 * The decoded token is returned through the parameters
1078 * 'h', 'l', or 'L' for integer fields
1079 * 'z' support added 23/7/1999 S.H.
1080 * 'z' changed to 'Z' --davidm 1/25/99
1081 * 't' added for ptrdiff_t
1083 * @fmt: the format string
1084 * @type of the token returned
1085 * @flags: various flags such as +, -, # tokens..
1086 * @field_width: overwritten width
1087 * @base: base of the number (octal, hex, ...)
1088 * @precision: precision of a number
1089 * @qualifier: qualifier of a number (long, size_t, ...)
1091 static noinline_for_stack
1092 int format_decode(const char *fmt
, struct printf_spec
*spec
)
1094 const char *start
= fmt
;
1096 /* we finished early by reading the field width */
1097 if (spec
->type
== FORMAT_TYPE_WIDTH
) {
1098 if (spec
->field_width
< 0) {
1099 spec
->field_width
= -spec
->field_width
;
1100 spec
->flags
|= LEFT
;
1102 spec
->type
= FORMAT_TYPE_NONE
;
1106 /* we finished early by reading the precision */
1107 if (spec
->type
== FORMAT_TYPE_PRECISION
) {
1108 if (spec
->precision
< 0)
1109 spec
->precision
= 0;
1111 spec
->type
= FORMAT_TYPE_NONE
;
1116 spec
->type
= FORMAT_TYPE_NONE
;
1118 for (; *fmt
; ++fmt
) {
1123 /* Return the current non-format string */
1124 if (fmt
!= start
|| !*fmt
)
1130 while (1) { /* this also skips first '%' */
1136 case '-': spec
->flags
|= LEFT
; break;
1137 case '+': spec
->flags
|= PLUS
; break;
1138 case ' ': spec
->flags
|= SPACE
; break;
1139 case '#': spec
->flags
|= SPECIAL
; break;
1140 case '0': spec
->flags
|= ZEROPAD
; break;
1141 default: found
= false;
1148 /* get field width */
1149 spec
->field_width
= -1;
1152 spec
->field_width
= skip_atoi(&fmt
);
1153 else if (*fmt
== '*') {
1154 /* it's the next argument */
1155 spec
->type
= FORMAT_TYPE_WIDTH
;
1156 return ++fmt
- start
;
1160 /* get the precision */
1161 spec
->precision
= -1;
1164 if (isdigit(*fmt
)) {
1165 spec
->precision
= skip_atoi(&fmt
);
1166 if (spec
->precision
< 0)
1167 spec
->precision
= 0;
1168 } else if (*fmt
== '*') {
1169 /* it's the next argument */
1170 spec
->type
= FORMAT_TYPE_PRECISION
;
1171 return ++fmt
- start
;
1176 /* get the conversion qualifier */
1177 spec
->qualifier
= -1;
1178 if (*fmt
== 'h' || TOLOWER(*fmt
) == 'l' ||
1179 TOLOWER(*fmt
) == 'z' || *fmt
== 't') {
1180 spec
->qualifier
= *fmt
++;
1181 if (unlikely(spec
->qualifier
== *fmt
)) {
1182 if (spec
->qualifier
== 'l') {
1183 spec
->qualifier
= 'L';
1185 } else if (spec
->qualifier
== 'h') {
1186 spec
->qualifier
= 'H';
1196 spec
->type
= FORMAT_TYPE_CHAR
;
1197 return ++fmt
- start
;
1200 spec
->type
= FORMAT_TYPE_STR
;
1201 return ++fmt
- start
;
1204 spec
->type
= FORMAT_TYPE_PTR
;
1209 spec
->type
= FORMAT_TYPE_NRCHARS
;
1210 return ++fmt
- start
;
1213 spec
->type
= FORMAT_TYPE_PERCENT_CHAR
;
1214 return ++fmt
- start
;
1216 /* integer number formats - set up the flags and "break" */
1222 spec
->flags
|= SMALL
;
1230 spec
->flags
|= SIGN
;
1235 spec
->type
= FORMAT_TYPE_INVALID
;
1239 if (spec
->qualifier
== 'L')
1240 spec
->type
= FORMAT_TYPE_LONG_LONG
;
1241 else if (spec
->qualifier
== 'l') {
1242 if (spec
->flags
& SIGN
)
1243 spec
->type
= FORMAT_TYPE_LONG
;
1245 spec
->type
= FORMAT_TYPE_ULONG
;
1246 } else if (TOLOWER(spec
->qualifier
) == 'z') {
1247 spec
->type
= FORMAT_TYPE_SIZE_T
;
1248 } else if (spec
->qualifier
== 't') {
1249 spec
->type
= FORMAT_TYPE_PTRDIFF
;
1250 } else if (spec
->qualifier
== 'H') {
1251 if (spec
->flags
& SIGN
)
1252 spec
->type
= FORMAT_TYPE_BYTE
;
1254 spec
->type
= FORMAT_TYPE_UBYTE
;
1255 } else if (spec
->qualifier
== 'h') {
1256 if (spec
->flags
& SIGN
)
1257 spec
->type
= FORMAT_TYPE_SHORT
;
1259 spec
->type
= FORMAT_TYPE_USHORT
;
1261 if (spec
->flags
& SIGN
)
1262 spec
->type
= FORMAT_TYPE_INT
;
1264 spec
->type
= FORMAT_TYPE_UINT
;
1267 return ++fmt
- start
;
1271 * vsnprintf - Format a string and place it in a buffer
1272 * @buf: The buffer to place the result into
1273 * @size: The size of the buffer, including the trailing null space
1274 * @fmt: The format string to use
1275 * @args: Arguments for the format string
1277 * This function follows C99 vsnprintf, but has some extensions:
1278 * %pS output the name of a text symbol with offset
1279 * %ps output the name of a text symbol without offset
1280 * %pF output the name of a function pointer with its offset
1281 * %pf output the name of a function pointer without its offset
1282 * %pR output the address range in a struct resource with decoded flags
1283 * %pr output the address range in a struct resource with raw flags
1284 * %pM output a 6-byte MAC address with colons
1285 * %pm output a 6-byte MAC address without colons
1286 * %pI4 print an IPv4 address without leading zeros
1287 * %pi4 print an IPv4 address with leading zeros
1288 * %pI6 print an IPv6 address with colons
1289 * %pi6 print an IPv6 address without colons
1290 * %pI6c print an IPv6 address as specified by
1291 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
1292 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1296 * The return value is the number of characters which would
1297 * be generated for the given input, excluding the trailing
1298 * '\0', as per ISO C99. If you want to have the exact
1299 * number of characters written into @buf as return value
1300 * (not including the trailing '\0'), use vscnprintf(). If the
1301 * return is greater than or equal to @size, the resulting
1302 * string is truncated.
1304 * Call this function if you are already dealing with a va_list.
1305 * You probably want snprintf() instead.
1307 int vsnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1309 unsigned long long num
;
1311 struct printf_spec spec
= {0};
1313 /* Reject out-of-range values early. Large positive sizes are
1314 used for unknown buffer sizes. */
1315 if (WARN_ON_ONCE((int) size
< 0))
1321 /* Make sure end is always >= buf */
1328 const char *old_fmt
= fmt
;
1329 int read
= format_decode(fmt
, &spec
);
1333 switch (spec
.type
) {
1334 case FORMAT_TYPE_NONE
: {
1337 if (copy
> end
- str
)
1339 memcpy(str
, old_fmt
, copy
);
1345 case FORMAT_TYPE_WIDTH
:
1346 spec
.field_width
= va_arg(args
, int);
1349 case FORMAT_TYPE_PRECISION
:
1350 spec
.precision
= va_arg(args
, int);
1353 case FORMAT_TYPE_CHAR
: {
1356 if (!(spec
.flags
& LEFT
)) {
1357 while (--spec
.field_width
> 0) {
1364 c
= (unsigned char) va_arg(args
, int);
1368 while (--spec
.field_width
> 0) {
1376 case FORMAT_TYPE_STR
:
1377 str
= string(str
, end
, va_arg(args
, char *), spec
);
1380 case FORMAT_TYPE_PTR
:
1381 str
= pointer(fmt
+1, str
, end
, va_arg(args
, void *),
1383 while (isalnum(*fmt
))
1387 case FORMAT_TYPE_PERCENT_CHAR
:
1393 case FORMAT_TYPE_INVALID
:
1399 case FORMAT_TYPE_NRCHARS
: {
1400 u8 qualifier
= spec
.qualifier
;
1402 if (qualifier
== 'l') {
1403 long *ip
= va_arg(args
, long *);
1405 } else if (TOLOWER(qualifier
) == 'z') {
1406 size_t *ip
= va_arg(args
, size_t *);
1409 int *ip
= va_arg(args
, int *);
1416 switch (spec
.type
) {
1417 case FORMAT_TYPE_LONG_LONG
:
1418 num
= va_arg(args
, long long);
1420 case FORMAT_TYPE_ULONG
:
1421 num
= va_arg(args
, unsigned long);
1423 case FORMAT_TYPE_LONG
:
1424 num
= va_arg(args
, long);
1426 case FORMAT_TYPE_SIZE_T
:
1427 num
= va_arg(args
, size_t);
1429 case FORMAT_TYPE_PTRDIFF
:
1430 num
= va_arg(args
, ptrdiff_t);
1432 case FORMAT_TYPE_UBYTE
:
1433 num
= (unsigned char) va_arg(args
, int);
1435 case FORMAT_TYPE_BYTE
:
1436 num
= (signed char) va_arg(args
, int);
1438 case FORMAT_TYPE_USHORT
:
1439 num
= (unsigned short) va_arg(args
, int);
1441 case FORMAT_TYPE_SHORT
:
1442 num
= (short) va_arg(args
, int);
1444 case FORMAT_TYPE_INT
:
1445 num
= (int) va_arg(args
, int);
1448 num
= va_arg(args
, unsigned int);
1451 str
= number(str
, end
, num
, spec
);
1462 /* the trailing null byte doesn't count towards the total */
1466 EXPORT_SYMBOL(vsnprintf
);
1469 * vscnprintf - Format a string and place it in a buffer
1470 * @buf: The buffer to place the result into
1471 * @size: The size of the buffer, including the trailing null space
1472 * @fmt: The format string to use
1473 * @args: Arguments for the format string
1475 * The return value is the number of characters which have been written into
1476 * the @buf not including the trailing '\0'. If @size is == 0 the function
1479 * Call this function if you are already dealing with a va_list.
1480 * You probably want scnprintf() instead.
1482 * See the vsnprintf() documentation for format string extensions over C99.
1484 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1488 i
= vsnprintf(buf
, size
, fmt
, args
);
1490 if (likely(i
< size
))
1496 EXPORT_SYMBOL(vscnprintf
);
1499 * snprintf - Format a string and place it in a buffer
1500 * @buf: The buffer to place the result into
1501 * @size: The size of the buffer, including the trailing null space
1502 * @fmt: The format string to use
1503 * @...: Arguments for the format string
1505 * The return value is the number of characters which would be
1506 * generated for the given input, excluding the trailing null,
1507 * as per ISO C99. If the return is greater than or equal to
1508 * @size, the resulting string is truncated.
1510 * See the vsnprintf() documentation for format string extensions over C99.
1512 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
1517 va_start(args
, fmt
);
1518 i
= vsnprintf(buf
, size
, fmt
, args
);
1523 EXPORT_SYMBOL(snprintf
);
1526 * scnprintf - Format a string and place it in a buffer
1527 * @buf: The buffer to place the result into
1528 * @size: The size of the buffer, including the trailing null space
1529 * @fmt: The format string to use
1530 * @...: Arguments for the format string
1532 * The return value is the number of characters written into @buf not including
1533 * the trailing '\0'. If @size is == 0 the function returns 0.
1536 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
1541 va_start(args
, fmt
);
1542 i
= vscnprintf(buf
, size
, fmt
, args
);
1547 EXPORT_SYMBOL(scnprintf
);
1550 * vsprintf - Format a string and place it in a buffer
1551 * @buf: The buffer to place the result into
1552 * @fmt: The format string to use
1553 * @args: Arguments for the format string
1555 * The function returns the number of characters written
1556 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1559 * Call this function if you are already dealing with a va_list.
1560 * You probably want sprintf() instead.
1562 * See the vsnprintf() documentation for format string extensions over C99.
1564 int vsprintf(char *buf
, const char *fmt
, va_list args
)
1566 return vsnprintf(buf
, INT_MAX
, fmt
, args
);
1568 EXPORT_SYMBOL(vsprintf
);
1571 * sprintf - Format a string and place it in a buffer
1572 * @buf: The buffer to place the result into
1573 * @fmt: The format string to use
1574 * @...: Arguments for the format string
1576 * The function returns the number of characters written
1577 * into @buf. Use snprintf() or scnprintf() in order to avoid
1580 * See the vsnprintf() documentation for format string extensions over C99.
1582 int sprintf(char *buf
, const char *fmt
, ...)
1587 va_start(args
, fmt
);
1588 i
= vsnprintf(buf
, INT_MAX
, fmt
, args
);
1593 EXPORT_SYMBOL(sprintf
);
1595 #ifdef CONFIG_BINARY_PRINTF
1598 * vbin_printf() - VA arguments to binary data
1599 * bstr_printf() - Binary data to text string
1603 * vbin_printf - Parse a format string and place args' binary value in a buffer
1604 * @bin_buf: The buffer to place args' binary value
1605 * @size: The size of the buffer(by words(32bits), not characters)
1606 * @fmt: The format string to use
1607 * @args: Arguments for the format string
1609 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1612 * The return value is the number of words(32bits) which would be generated for
1616 * If the return value is greater than @size, the resulting bin_buf is NOT
1617 * valid for bstr_printf().
1619 int vbin_printf(u32
*bin_buf
, size_t size
, const char *fmt
, va_list args
)
1621 struct printf_spec spec
= {0};
1624 str
= (char *)bin_buf
;
1625 end
= (char *)(bin_buf
+ size
);
1627 #define save_arg(type) \
1629 if (sizeof(type) == 8) { \
1630 unsigned long long value; \
1631 str = PTR_ALIGN(str, sizeof(u32)); \
1632 value = va_arg(args, unsigned long long); \
1633 if (str + sizeof(type) <= end) { \
1634 *(u32 *)str = *(u32 *)&value; \
1635 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1638 unsigned long value; \
1639 str = PTR_ALIGN(str, sizeof(type)); \
1640 value = va_arg(args, int); \
1641 if (str + sizeof(type) <= end) \
1642 *(typeof(type) *)str = (type)value; \
1644 str += sizeof(type); \
1648 int read
= format_decode(fmt
, &spec
);
1652 switch (spec
.type
) {
1653 case FORMAT_TYPE_NONE
:
1654 case FORMAT_TYPE_INVALID
:
1655 case FORMAT_TYPE_PERCENT_CHAR
:
1658 case FORMAT_TYPE_WIDTH
:
1659 case FORMAT_TYPE_PRECISION
:
1663 case FORMAT_TYPE_CHAR
:
1667 case FORMAT_TYPE_STR
: {
1668 const char *save_str
= va_arg(args
, char *);
1671 if ((unsigned long)save_str
> (unsigned long)-PAGE_SIZE
1672 || (unsigned long)save_str
< PAGE_SIZE
)
1673 save_str
= "(null)";
1674 len
= strlen(save_str
) + 1;
1675 if (str
+ len
< end
)
1676 memcpy(str
, save_str
, len
);
1681 case FORMAT_TYPE_PTR
:
1683 /* skip all alphanumeric pointer suffixes */
1684 while (isalnum(*fmt
))
1688 case FORMAT_TYPE_NRCHARS
: {
1689 /* skip %n 's argument */
1690 u8 qualifier
= spec
.qualifier
;
1692 if (qualifier
== 'l')
1693 skip_arg
= va_arg(args
, long *);
1694 else if (TOLOWER(qualifier
) == 'z')
1695 skip_arg
= va_arg(args
, size_t *);
1697 skip_arg
= va_arg(args
, int *);
1702 switch (spec
.type
) {
1704 case FORMAT_TYPE_LONG_LONG
:
1705 save_arg(long long);
1707 case FORMAT_TYPE_ULONG
:
1708 case FORMAT_TYPE_LONG
:
1709 save_arg(unsigned long);
1711 case FORMAT_TYPE_SIZE_T
:
1714 case FORMAT_TYPE_PTRDIFF
:
1715 save_arg(ptrdiff_t);
1717 case FORMAT_TYPE_UBYTE
:
1718 case FORMAT_TYPE_BYTE
:
1721 case FORMAT_TYPE_USHORT
:
1722 case FORMAT_TYPE_SHORT
:
1731 return (u32
*)(PTR_ALIGN(str
, sizeof(u32
))) - bin_buf
;
1734 EXPORT_SYMBOL_GPL(vbin_printf
);
1737 * bstr_printf - Format a string from binary arguments and place it in a buffer
1738 * @buf: The buffer to place the result into
1739 * @size: The size of the buffer, including the trailing null space
1740 * @fmt: The format string to use
1741 * @bin_buf: Binary arguments for the format string
1743 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1744 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1745 * a binary buffer that generated by vbin_printf.
1747 * The format follows C99 vsnprintf, but has some extensions:
1748 * see vsnprintf comment for details.
1750 * The return value is the number of characters which would
1751 * be generated for the given input, excluding the trailing
1752 * '\0', as per ISO C99. If you want to have the exact
1753 * number of characters written into @buf as return value
1754 * (not including the trailing '\0'), use vscnprintf(). If the
1755 * return is greater than or equal to @size, the resulting
1756 * string is truncated.
1758 int bstr_printf(char *buf
, size_t size
, const char *fmt
, const u32
*bin_buf
)
1760 struct printf_spec spec
= {0};
1762 const char *args
= (const char *)bin_buf
;
1764 if (WARN_ON_ONCE((int) size
< 0))
1770 #define get_arg(type) \
1772 typeof(type) value; \
1773 if (sizeof(type) == 8) { \
1774 args = PTR_ALIGN(args, sizeof(u32)); \
1775 *(u32 *)&value = *(u32 *)args; \
1776 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1778 args = PTR_ALIGN(args, sizeof(type)); \
1779 value = *(typeof(type) *)args; \
1781 args += sizeof(type); \
1785 /* Make sure end is always >= buf */
1792 const char *old_fmt
= fmt
;
1793 int read
= format_decode(fmt
, &spec
);
1797 switch (spec
.type
) {
1798 case FORMAT_TYPE_NONE
: {
1801 if (copy
> end
- str
)
1803 memcpy(str
, old_fmt
, copy
);
1809 case FORMAT_TYPE_WIDTH
:
1810 spec
.field_width
= get_arg(int);
1813 case FORMAT_TYPE_PRECISION
:
1814 spec
.precision
= get_arg(int);
1817 case FORMAT_TYPE_CHAR
: {
1820 if (!(spec
.flags
& LEFT
)) {
1821 while (--spec
.field_width
> 0) {
1827 c
= (unsigned char) get_arg(char);
1831 while (--spec
.field_width
> 0) {
1839 case FORMAT_TYPE_STR
: {
1840 const char *str_arg
= args
;
1841 args
+= strlen(str_arg
) + 1;
1842 str
= string(str
, end
, (char *)str_arg
, spec
);
1846 case FORMAT_TYPE_PTR
:
1847 str
= pointer(fmt
+1, str
, end
, get_arg(void *), spec
);
1848 while (isalnum(*fmt
))
1852 case FORMAT_TYPE_PERCENT_CHAR
:
1853 case FORMAT_TYPE_INVALID
:
1859 case FORMAT_TYPE_NRCHARS
:
1864 unsigned long long num
;
1866 switch (spec
.type
) {
1868 case FORMAT_TYPE_LONG_LONG
:
1869 num
= get_arg(long long);
1871 case FORMAT_TYPE_ULONG
:
1872 case FORMAT_TYPE_LONG
:
1873 num
= get_arg(unsigned long);
1875 case FORMAT_TYPE_SIZE_T
:
1876 num
= get_arg(size_t);
1878 case FORMAT_TYPE_PTRDIFF
:
1879 num
= get_arg(ptrdiff_t);
1881 case FORMAT_TYPE_UBYTE
:
1882 num
= get_arg(unsigned char);
1884 case FORMAT_TYPE_BYTE
:
1885 num
= get_arg(signed char);
1887 case FORMAT_TYPE_USHORT
:
1888 num
= get_arg(unsigned short);
1890 case FORMAT_TYPE_SHORT
:
1891 num
= get_arg(short);
1893 case FORMAT_TYPE_UINT
:
1894 num
= get_arg(unsigned int);
1900 str
= number(str
, end
, num
, spec
);
1902 } /* switch(spec.type) */
1914 /* the trailing null byte doesn't count towards the total */
1917 EXPORT_SYMBOL_GPL(bstr_printf
);
1920 * bprintf - Parse a format string and place args' binary value in a buffer
1921 * @bin_buf: The buffer to place args' binary value
1922 * @size: The size of the buffer(by words(32bits), not characters)
1923 * @fmt: The format string to use
1924 * @...: Arguments for the format string
1926 * The function returns the number of words(u32) written
1929 int bprintf(u32
*bin_buf
, size_t size
, const char *fmt
, ...)
1934 va_start(args
, fmt
);
1935 ret
= vbin_printf(bin_buf
, size
, fmt
, args
);
1940 EXPORT_SYMBOL_GPL(bprintf
);
1942 #endif /* CONFIG_BINARY_PRINTF */
1945 * vsscanf - Unformat a buffer into a list of arguments
1946 * @buf: input buffer
1947 * @fmt: format of buffer
1950 int vsscanf(const char *buf
, const char *fmt
, va_list args
)
1952 const char *str
= buf
;
1961 while (*fmt
&& *str
) {
1962 /* skip any white space in format */
1963 /* white space in format matchs any amount of
1964 * white space, including none, in the input.
1966 if (isspace(*fmt
)) {
1967 fmt
= skip_spaces(++fmt
);
1968 str
= skip_spaces(str
);
1971 /* anything that is not a conversion must match exactly */
1972 if (*fmt
!= '%' && *fmt
) {
1973 if (*fmt
++ != *str
++)
1982 /* skip this conversion.
1983 * advance both strings to next white space
1986 while (!isspace(*fmt
) && *fmt
!= '%' && *fmt
)
1988 while (!isspace(*str
) && *str
)
1993 /* get field width */
1996 field_width
= skip_atoi(&fmt
);
1998 /* get conversion qualifier */
2000 if (*fmt
== 'h' || TOLOWER(*fmt
) == 'l' ||
2001 TOLOWER(*fmt
) == 'z') {
2003 if (unlikely(qualifier
== *fmt
)) {
2004 if (qualifier
== 'h') {
2007 } else if (qualifier
== 'l') {
2023 char *s
= (char *)va_arg(args
, char*);
2024 if (field_width
== -1)
2028 } while (--field_width
> 0 && *str
);
2034 char *s
= (char *)va_arg(args
, char *);
2035 if (field_width
== -1)
2036 field_width
= SHRT_MAX
;
2037 /* first, skip leading white space in buffer */
2038 str
= skip_spaces(str
);
2040 /* now copy until next white space */
2041 while (*str
&& !isspace(*str
) && field_width
--)
2048 /* return number of characters read so far */
2050 int *i
= (int *)va_arg(args
, int*);
2068 /* looking for '%' in str */
2073 /* invalid format; stop here */
2077 /* have some sort of integer conversion.
2078 * first, skip white space in buffer.
2080 str
= skip_spaces(str
);
2083 if (is_sign
&& digit
== '-')
2087 || (base
== 16 && !isxdigit(digit
))
2088 || (base
== 10 && !isdigit(digit
))
2089 || (base
== 8 && (!isdigit(digit
) || digit
> '7'))
2090 || (base
== 0 && !isdigit(digit
)))
2093 switch (qualifier
) {
2094 case 'H': /* that's 'hh' in format */
2096 signed char *s
= (signed char *)va_arg(args
, signed char *);
2097 *s
= (signed char)simple_strtol(str
, &next
, base
);
2099 unsigned char *s
= (unsigned char *)va_arg(args
, unsigned char *);
2100 *s
= (unsigned char)simple_strtoul(str
, &next
, base
);
2105 short *s
= (short *)va_arg(args
, short *);
2106 *s
= (short)simple_strtol(str
, &next
, base
);
2108 unsigned short *s
= (unsigned short *)va_arg(args
, unsigned short *);
2109 *s
= (unsigned short)simple_strtoul(str
, &next
, base
);
2114 long *l
= (long *)va_arg(args
, long *);
2115 *l
= simple_strtol(str
, &next
, base
);
2117 unsigned long *l
= (unsigned long *)va_arg(args
, unsigned long *);
2118 *l
= simple_strtoul(str
, &next
, base
);
2123 long long *l
= (long long *)va_arg(args
, long long *);
2124 *l
= simple_strtoll(str
, &next
, base
);
2126 unsigned long long *l
= (unsigned long long *)va_arg(args
, unsigned long long *);
2127 *l
= simple_strtoull(str
, &next
, base
);
2133 size_t *s
= (size_t *)va_arg(args
, size_t *);
2134 *s
= (size_t)simple_strtoul(str
, &next
, base
);
2139 int *i
= (int *)va_arg(args
, int *);
2140 *i
= (int)simple_strtol(str
, &next
, base
);
2142 unsigned int *i
= (unsigned int *)va_arg(args
, unsigned int*);
2143 *i
= (unsigned int)simple_strtoul(str
, &next
, base
);
2155 * Now we've come all the way through so either the input string or the
2156 * format ended. In the former case, there can be a %n at the current
2157 * position in the format that needs to be filled.
2159 if (*fmt
== '%' && *(fmt
+ 1) == 'n') {
2160 int *p
= (int *)va_arg(args
, int *);
2166 EXPORT_SYMBOL(vsscanf
);
2169 * sscanf - Unformat a buffer into a list of arguments
2170 * @buf: input buffer
2171 * @fmt: formatting of buffer
2172 * @...: resulting arguments
2174 int sscanf(const char *buf
, const char *fmt
, ...)
2179 va_start(args
, fmt
);
2180 i
= vsscanf(buf
, fmt
, args
);
2185 EXPORT_SYMBOL(sscanf
);
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