]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - lib/vsprintf.c
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
)
994 if (!ptr
&& *fmt
!= 'K') {
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
);
1051 if (!((kptr_restrict
== 0) ||
1052 (kptr_restrict
== 1 &&
1053 has_capability_noaudit(current
, CAP_SYSLOG
))))
1057 spec
.flags
|= SMALL
;
1058 if (spec
.field_width
== -1) {
1059 spec
.field_width
= 2 * sizeof(void *);
1060 spec
.flags
|= ZEROPAD
;
1064 return number(buf
, end
, (unsigned long) ptr
, spec
);
1068 * Helper function to decode printf style format.
1069 * Each call decode a token from the format and return the
1070 * number of characters read (or likely the delta where it wants
1071 * to go on the next call).
1072 * The decoded token is returned through the parameters
1074 * 'h', 'l', or 'L' for integer fields
1075 * 'z' support added 23/7/1999 S.H.
1076 * 'z' changed to 'Z' --davidm 1/25/99
1077 * 't' added for ptrdiff_t
1079 * @fmt: the format string
1080 * @type of the token returned
1081 * @flags: various flags such as +, -, # tokens..
1082 * @field_width: overwritten width
1083 * @base: base of the number (octal, hex, ...)
1084 * @precision: precision of a number
1085 * @qualifier: qualifier of a number (long, size_t, ...)
1087 static noinline_for_stack
1088 int format_decode(const char *fmt
, struct printf_spec
*spec
)
1090 const char *start
= fmt
;
1092 /* we finished early by reading the field width */
1093 if (spec
->type
== FORMAT_TYPE_WIDTH
) {
1094 if (spec
->field_width
< 0) {
1095 spec
->field_width
= -spec
->field_width
;
1096 spec
->flags
|= LEFT
;
1098 spec
->type
= FORMAT_TYPE_NONE
;
1102 /* we finished early by reading the precision */
1103 if (spec
->type
== FORMAT_TYPE_PRECISION
) {
1104 if (spec
->precision
< 0)
1105 spec
->precision
= 0;
1107 spec
->type
= FORMAT_TYPE_NONE
;
1112 spec
->type
= FORMAT_TYPE_NONE
;
1114 for (; *fmt
; ++fmt
) {
1119 /* Return the current non-format string */
1120 if (fmt
!= start
|| !*fmt
)
1126 while (1) { /* this also skips first '%' */
1132 case '-': spec
->flags
|= LEFT
; break;
1133 case '+': spec
->flags
|= PLUS
; break;
1134 case ' ': spec
->flags
|= SPACE
; break;
1135 case '#': spec
->flags
|= SPECIAL
; break;
1136 case '0': spec
->flags
|= ZEROPAD
; break;
1137 default: found
= false;
1144 /* get field width */
1145 spec
->field_width
= -1;
1148 spec
->field_width
= skip_atoi(&fmt
);
1149 else if (*fmt
== '*') {
1150 /* it's the next argument */
1151 spec
->type
= FORMAT_TYPE_WIDTH
;
1152 return ++fmt
- start
;
1156 /* get the precision */
1157 spec
->precision
= -1;
1160 if (isdigit(*fmt
)) {
1161 spec
->precision
= skip_atoi(&fmt
);
1162 if (spec
->precision
< 0)
1163 spec
->precision
= 0;
1164 } else if (*fmt
== '*') {
1165 /* it's the next argument */
1166 spec
->type
= FORMAT_TYPE_PRECISION
;
1167 return ++fmt
- start
;
1172 /* get the conversion qualifier */
1173 spec
->qualifier
= -1;
1174 if (*fmt
== 'h' || TOLOWER(*fmt
) == 'l' ||
1175 TOLOWER(*fmt
) == 'z' || *fmt
== 't') {
1176 spec
->qualifier
= *fmt
++;
1177 if (unlikely(spec
->qualifier
== *fmt
)) {
1178 if (spec
->qualifier
== 'l') {
1179 spec
->qualifier
= 'L';
1181 } else if (spec
->qualifier
== 'h') {
1182 spec
->qualifier
= 'H';
1192 spec
->type
= FORMAT_TYPE_CHAR
;
1193 return ++fmt
- start
;
1196 spec
->type
= FORMAT_TYPE_STR
;
1197 return ++fmt
- start
;
1200 spec
->type
= FORMAT_TYPE_PTR
;
1205 spec
->type
= FORMAT_TYPE_NRCHARS
;
1206 return ++fmt
- start
;
1209 spec
->type
= FORMAT_TYPE_PERCENT_CHAR
;
1210 return ++fmt
- start
;
1212 /* integer number formats - set up the flags and "break" */
1218 spec
->flags
|= SMALL
;
1226 spec
->flags
|= SIGN
;
1231 spec
->type
= FORMAT_TYPE_INVALID
;
1235 if (spec
->qualifier
== 'L')
1236 spec
->type
= FORMAT_TYPE_LONG_LONG
;
1237 else if (spec
->qualifier
== 'l') {
1238 if (spec
->flags
& SIGN
)
1239 spec
->type
= FORMAT_TYPE_LONG
;
1241 spec
->type
= FORMAT_TYPE_ULONG
;
1242 } else if (TOLOWER(spec
->qualifier
) == 'z') {
1243 spec
->type
= FORMAT_TYPE_SIZE_T
;
1244 } else if (spec
->qualifier
== 't') {
1245 spec
->type
= FORMAT_TYPE_PTRDIFF
;
1246 } else if (spec
->qualifier
== 'H') {
1247 if (spec
->flags
& SIGN
)
1248 spec
->type
= FORMAT_TYPE_BYTE
;
1250 spec
->type
= FORMAT_TYPE_UBYTE
;
1251 } else if (spec
->qualifier
== 'h') {
1252 if (spec
->flags
& SIGN
)
1253 spec
->type
= FORMAT_TYPE_SHORT
;
1255 spec
->type
= FORMAT_TYPE_USHORT
;
1257 if (spec
->flags
& SIGN
)
1258 spec
->type
= FORMAT_TYPE_INT
;
1260 spec
->type
= FORMAT_TYPE_UINT
;
1263 return ++fmt
- start
;
1267 * vsnprintf - Format a string and place it in a buffer
1268 * @buf: The buffer to place the result into
1269 * @size: The size of the buffer, including the trailing null space
1270 * @fmt: The format string to use
1271 * @args: Arguments for the format string
1273 * This function follows C99 vsnprintf, but has some extensions:
1274 * %pS output the name of a text symbol with offset
1275 * %ps output the name of a text symbol without offset
1276 * %pF output the name of a function pointer with its offset
1277 * %pf output the name of a function pointer without its offset
1278 * %pR output the address range in a struct resource with decoded flags
1279 * %pr output the address range in a struct resource with raw flags
1280 * %pM output a 6-byte MAC address with colons
1281 * %pm output a 6-byte MAC address without colons
1282 * %pI4 print an IPv4 address without leading zeros
1283 * %pi4 print an IPv4 address with leading zeros
1284 * %pI6 print an IPv6 address with colons
1285 * %pi6 print an IPv6 address without colons
1286 * %pI6c print an IPv6 address as specified by
1287 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
1288 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1292 * The return value is the number of characters which would
1293 * be generated for the given input, excluding the trailing
1294 * '\0', as per ISO C99. If you want to have the exact
1295 * number of characters written into @buf as return value
1296 * (not including the trailing '\0'), use vscnprintf(). If the
1297 * return is greater than or equal to @size, the resulting
1298 * string is truncated.
1300 * Call this function if you are already dealing with a va_list.
1301 * You probably want snprintf() instead.
1303 int vsnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1305 unsigned long long num
;
1307 struct printf_spec spec
= {0};
1309 /* Reject out-of-range values early. Large positive sizes are
1310 used for unknown buffer sizes. */
1311 if (WARN_ON_ONCE((int) size
< 0))
1317 /* Make sure end is always >= buf */
1324 const char *old_fmt
= fmt
;
1325 int read
= format_decode(fmt
, &spec
);
1329 switch (spec
.type
) {
1330 case FORMAT_TYPE_NONE
: {
1333 if (copy
> end
- str
)
1335 memcpy(str
, old_fmt
, copy
);
1341 case FORMAT_TYPE_WIDTH
:
1342 spec
.field_width
= va_arg(args
, int);
1345 case FORMAT_TYPE_PRECISION
:
1346 spec
.precision
= va_arg(args
, int);
1349 case FORMAT_TYPE_CHAR
: {
1352 if (!(spec
.flags
& LEFT
)) {
1353 while (--spec
.field_width
> 0) {
1360 c
= (unsigned char) va_arg(args
, int);
1364 while (--spec
.field_width
> 0) {
1372 case FORMAT_TYPE_STR
:
1373 str
= string(str
, end
, va_arg(args
, char *), spec
);
1376 case FORMAT_TYPE_PTR
:
1377 str
= pointer(fmt
+1, str
, end
, va_arg(args
, void *),
1379 while (isalnum(*fmt
))
1383 case FORMAT_TYPE_PERCENT_CHAR
:
1389 case FORMAT_TYPE_INVALID
:
1395 case FORMAT_TYPE_NRCHARS
: {
1396 u8 qualifier
= spec
.qualifier
;
1398 if (qualifier
== 'l') {
1399 long *ip
= va_arg(args
, long *);
1401 } else if (TOLOWER(qualifier
) == 'z') {
1402 size_t *ip
= va_arg(args
, size_t *);
1405 int *ip
= va_arg(args
, int *);
1412 switch (spec
.type
) {
1413 case FORMAT_TYPE_LONG_LONG
:
1414 num
= va_arg(args
, long long);
1416 case FORMAT_TYPE_ULONG
:
1417 num
= va_arg(args
, unsigned long);
1419 case FORMAT_TYPE_LONG
:
1420 num
= va_arg(args
, long);
1422 case FORMAT_TYPE_SIZE_T
:
1423 num
= va_arg(args
, size_t);
1425 case FORMAT_TYPE_PTRDIFF
:
1426 num
= va_arg(args
, ptrdiff_t);
1428 case FORMAT_TYPE_UBYTE
:
1429 num
= (unsigned char) va_arg(args
, int);
1431 case FORMAT_TYPE_BYTE
:
1432 num
= (signed char) va_arg(args
, int);
1434 case FORMAT_TYPE_USHORT
:
1435 num
= (unsigned short) va_arg(args
, int);
1437 case FORMAT_TYPE_SHORT
:
1438 num
= (short) va_arg(args
, int);
1440 case FORMAT_TYPE_INT
:
1441 num
= (int) va_arg(args
, int);
1444 num
= va_arg(args
, unsigned int);
1447 str
= number(str
, end
, num
, spec
);
1458 /* the trailing null byte doesn't count towards the total */
1462 EXPORT_SYMBOL(vsnprintf
);
1465 * vscnprintf - Format a string and place it in a buffer
1466 * @buf: The buffer to place the result into
1467 * @size: The size of the buffer, including the trailing null space
1468 * @fmt: The format string to use
1469 * @args: Arguments for the format string
1471 * The return value is the number of characters which have been written into
1472 * the @buf not including the trailing '\0'. If @size is == 0 the function
1475 * Call this function if you are already dealing with a va_list.
1476 * You probably want scnprintf() instead.
1478 * See the vsnprintf() documentation for format string extensions over C99.
1480 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
1484 i
= vsnprintf(buf
, size
, fmt
, args
);
1486 if (likely(i
< size
))
1492 EXPORT_SYMBOL(vscnprintf
);
1495 * snprintf - Format a string and place it in a buffer
1496 * @buf: The buffer to place the result into
1497 * @size: The size of the buffer, including the trailing null space
1498 * @fmt: The format string to use
1499 * @...: Arguments for the format string
1501 * The return value is the number of characters which would be
1502 * generated for the given input, excluding the trailing null,
1503 * as per ISO C99. If the return is greater than or equal to
1504 * @size, the resulting string is truncated.
1506 * See the vsnprintf() documentation for format string extensions over C99.
1508 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
1513 va_start(args
, fmt
);
1514 i
= vsnprintf(buf
, size
, fmt
, args
);
1519 EXPORT_SYMBOL(snprintf
);
1522 * scnprintf - Format a string and place it in a buffer
1523 * @buf: The buffer to place the result into
1524 * @size: The size of the buffer, including the trailing null space
1525 * @fmt: The format string to use
1526 * @...: Arguments for the format string
1528 * The return value is the number of characters written into @buf not including
1529 * the trailing '\0'. If @size is == 0 the function returns 0.
1532 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
1537 va_start(args
, fmt
);
1538 i
= vscnprintf(buf
, size
, fmt
, args
);
1543 EXPORT_SYMBOL(scnprintf
);
1546 * vsprintf - Format a string and place it in a buffer
1547 * @buf: The buffer to place the result into
1548 * @fmt: The format string to use
1549 * @args: Arguments for the format string
1551 * The function returns the number of characters written
1552 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1555 * Call this function if you are already dealing with a va_list.
1556 * You probably want sprintf() instead.
1558 * See the vsnprintf() documentation for format string extensions over C99.
1560 int vsprintf(char *buf
, const char *fmt
, va_list args
)
1562 return vsnprintf(buf
, INT_MAX
, fmt
, args
);
1564 EXPORT_SYMBOL(vsprintf
);
1567 * sprintf - Format a string and place it in a buffer
1568 * @buf: The buffer to place the result into
1569 * @fmt: The format string to use
1570 * @...: Arguments for the format string
1572 * The function returns the number of characters written
1573 * into @buf. Use snprintf() or scnprintf() in order to avoid
1576 * See the vsnprintf() documentation for format string extensions over C99.
1578 int sprintf(char *buf
, const char *fmt
, ...)
1583 va_start(args
, fmt
);
1584 i
= vsnprintf(buf
, INT_MAX
, fmt
, args
);
1589 EXPORT_SYMBOL(sprintf
);
1591 #ifdef CONFIG_BINARY_PRINTF
1594 * vbin_printf() - VA arguments to binary data
1595 * bstr_printf() - Binary data to text string
1599 * vbin_printf - Parse a format string and place args' binary value in a buffer
1600 * @bin_buf: The buffer to place args' binary value
1601 * @size: The size of the buffer(by words(32bits), not characters)
1602 * @fmt: The format string to use
1603 * @args: Arguments for the format string
1605 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1608 * The return value is the number of words(32bits) which would be generated for
1612 * If the return value is greater than @size, the resulting bin_buf is NOT
1613 * valid for bstr_printf().
1615 int vbin_printf(u32
*bin_buf
, size_t size
, const char *fmt
, va_list args
)
1617 struct printf_spec spec
= {0};
1620 str
= (char *)bin_buf
;
1621 end
= (char *)(bin_buf
+ size
);
1623 #define save_arg(type) \
1625 if (sizeof(type) == 8) { \
1626 unsigned long long value; \
1627 str = PTR_ALIGN(str, sizeof(u32)); \
1628 value = va_arg(args, unsigned long long); \
1629 if (str + sizeof(type) <= end) { \
1630 *(u32 *)str = *(u32 *)&value; \
1631 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1634 unsigned long value; \
1635 str = PTR_ALIGN(str, sizeof(type)); \
1636 value = va_arg(args, int); \
1637 if (str + sizeof(type) <= end) \
1638 *(typeof(type) *)str = (type)value; \
1640 str += sizeof(type); \
1644 int read
= format_decode(fmt
, &spec
);
1648 switch (spec
.type
) {
1649 case FORMAT_TYPE_NONE
:
1650 case FORMAT_TYPE_INVALID
:
1651 case FORMAT_TYPE_PERCENT_CHAR
:
1654 case FORMAT_TYPE_WIDTH
:
1655 case FORMAT_TYPE_PRECISION
:
1659 case FORMAT_TYPE_CHAR
:
1663 case FORMAT_TYPE_STR
: {
1664 const char *save_str
= va_arg(args
, char *);
1667 if ((unsigned long)save_str
> (unsigned long)-PAGE_SIZE
1668 || (unsigned long)save_str
< PAGE_SIZE
)
1669 save_str
= "(null)";
1670 len
= strlen(save_str
) + 1;
1671 if (str
+ len
< end
)
1672 memcpy(str
, save_str
, len
);
1677 case FORMAT_TYPE_PTR
:
1679 /* skip all alphanumeric pointer suffixes */
1680 while (isalnum(*fmt
))
1684 case FORMAT_TYPE_NRCHARS
: {
1685 /* skip %n 's argument */
1686 u8 qualifier
= spec
.qualifier
;
1688 if (qualifier
== 'l')
1689 skip_arg
= va_arg(args
, long *);
1690 else if (TOLOWER(qualifier
) == 'z')
1691 skip_arg
= va_arg(args
, size_t *);
1693 skip_arg
= va_arg(args
, int *);
1698 switch (spec
.type
) {
1700 case FORMAT_TYPE_LONG_LONG
:
1701 save_arg(long long);
1703 case FORMAT_TYPE_ULONG
:
1704 case FORMAT_TYPE_LONG
:
1705 save_arg(unsigned long);
1707 case FORMAT_TYPE_SIZE_T
:
1710 case FORMAT_TYPE_PTRDIFF
:
1711 save_arg(ptrdiff_t);
1713 case FORMAT_TYPE_UBYTE
:
1714 case FORMAT_TYPE_BYTE
:
1717 case FORMAT_TYPE_USHORT
:
1718 case FORMAT_TYPE_SHORT
:
1727 return (u32
*)(PTR_ALIGN(str
, sizeof(u32
))) - bin_buf
;
1730 EXPORT_SYMBOL_GPL(vbin_printf
);
1733 * bstr_printf - Format a string from binary arguments and place it in a buffer
1734 * @buf: The buffer to place the result into
1735 * @size: The size of the buffer, including the trailing null space
1736 * @fmt: The format string to use
1737 * @bin_buf: Binary arguments for the format string
1739 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1740 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1741 * a binary buffer that generated by vbin_printf.
1743 * The format follows C99 vsnprintf, but has some extensions:
1744 * see vsnprintf comment for details.
1746 * The return value is the number of characters which would
1747 * be generated for the given input, excluding the trailing
1748 * '\0', as per ISO C99. If you want to have the exact
1749 * number of characters written into @buf as return value
1750 * (not including the trailing '\0'), use vscnprintf(). If the
1751 * return is greater than or equal to @size, the resulting
1752 * string is truncated.
1754 int bstr_printf(char *buf
, size_t size
, const char *fmt
, const u32
*bin_buf
)
1756 struct printf_spec spec
= {0};
1758 const char *args
= (const char *)bin_buf
;
1760 if (WARN_ON_ONCE((int) size
< 0))
1766 #define get_arg(type) \
1768 typeof(type) value; \
1769 if (sizeof(type) == 8) { \
1770 args = PTR_ALIGN(args, sizeof(u32)); \
1771 *(u32 *)&value = *(u32 *)args; \
1772 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1774 args = PTR_ALIGN(args, sizeof(type)); \
1775 value = *(typeof(type) *)args; \
1777 args += sizeof(type); \
1781 /* Make sure end is always >= buf */
1788 const char *old_fmt
= fmt
;
1789 int read
= format_decode(fmt
, &spec
);
1793 switch (spec
.type
) {
1794 case FORMAT_TYPE_NONE
: {
1797 if (copy
> end
- str
)
1799 memcpy(str
, old_fmt
, copy
);
1805 case FORMAT_TYPE_WIDTH
:
1806 spec
.field_width
= get_arg(int);
1809 case FORMAT_TYPE_PRECISION
:
1810 spec
.precision
= get_arg(int);
1813 case FORMAT_TYPE_CHAR
: {
1816 if (!(spec
.flags
& LEFT
)) {
1817 while (--spec
.field_width
> 0) {
1823 c
= (unsigned char) get_arg(char);
1827 while (--spec
.field_width
> 0) {
1835 case FORMAT_TYPE_STR
: {
1836 const char *str_arg
= args
;
1837 args
+= strlen(str_arg
) + 1;
1838 str
= string(str
, end
, (char *)str_arg
, spec
);
1842 case FORMAT_TYPE_PTR
:
1843 str
= pointer(fmt
+1, str
, end
, get_arg(void *), spec
);
1844 while (isalnum(*fmt
))
1848 case FORMAT_TYPE_PERCENT_CHAR
:
1849 case FORMAT_TYPE_INVALID
:
1855 case FORMAT_TYPE_NRCHARS
:
1860 unsigned long long num
;
1862 switch (spec
.type
) {
1864 case FORMAT_TYPE_LONG_LONG
:
1865 num
= get_arg(long long);
1867 case FORMAT_TYPE_ULONG
:
1868 case FORMAT_TYPE_LONG
:
1869 num
= get_arg(unsigned long);
1871 case FORMAT_TYPE_SIZE_T
:
1872 num
= get_arg(size_t);
1874 case FORMAT_TYPE_PTRDIFF
:
1875 num
= get_arg(ptrdiff_t);
1877 case FORMAT_TYPE_UBYTE
:
1878 num
= get_arg(unsigned char);
1880 case FORMAT_TYPE_BYTE
:
1881 num
= get_arg(signed char);
1883 case FORMAT_TYPE_USHORT
:
1884 num
= get_arg(unsigned short);
1886 case FORMAT_TYPE_SHORT
:
1887 num
= get_arg(short);
1889 case FORMAT_TYPE_UINT
:
1890 num
= get_arg(unsigned int);
1896 str
= number(str
, end
, num
, spec
);
1898 } /* switch(spec.type) */
1910 /* the trailing null byte doesn't count towards the total */
1913 EXPORT_SYMBOL_GPL(bstr_printf
);
1916 * bprintf - Parse a format string and place args' binary value in a buffer
1917 * @bin_buf: The buffer to place args' binary value
1918 * @size: The size of the buffer(by words(32bits), not characters)
1919 * @fmt: The format string to use
1920 * @...: Arguments for the format string
1922 * The function returns the number of words(u32) written
1925 int bprintf(u32
*bin_buf
, size_t size
, const char *fmt
, ...)
1930 va_start(args
, fmt
);
1931 ret
= vbin_printf(bin_buf
, size
, fmt
, args
);
1936 EXPORT_SYMBOL_GPL(bprintf
);
1938 #endif /* CONFIG_BINARY_PRINTF */
1941 * vsscanf - Unformat a buffer into a list of arguments
1942 * @buf: input buffer
1943 * @fmt: format of buffer
1946 int vsscanf(const char *buf
, const char *fmt
, va_list args
)
1948 const char *str
= buf
;
1957 while (*fmt
&& *str
) {
1958 /* skip any white space in format */
1959 /* white space in format matchs any amount of
1960 * white space, including none, in the input.
1962 if (isspace(*fmt
)) {
1963 fmt
= skip_spaces(++fmt
);
1964 str
= skip_spaces(str
);
1967 /* anything that is not a conversion must match exactly */
1968 if (*fmt
!= '%' && *fmt
) {
1969 if (*fmt
++ != *str
++)
1978 /* skip this conversion.
1979 * advance both strings to next white space
1982 while (!isspace(*fmt
) && *fmt
!= '%' && *fmt
)
1984 while (!isspace(*str
) && *str
)
1989 /* get field width */
1992 field_width
= skip_atoi(&fmt
);
1994 /* get conversion qualifier */
1996 if (*fmt
== 'h' || TOLOWER(*fmt
) == 'l' ||
1997 TOLOWER(*fmt
) == 'z') {
1999 if (unlikely(qualifier
== *fmt
)) {
2000 if (qualifier
== 'h') {
2003 } else if (qualifier
== 'l') {
2019 char *s
= (char *)va_arg(args
, char*);
2020 if (field_width
== -1)
2024 } while (--field_width
> 0 && *str
);
2030 char *s
= (char *)va_arg(args
, char *);
2031 if (field_width
== -1)
2032 field_width
= SHRT_MAX
;
2033 /* first, skip leading white space in buffer */
2034 str
= skip_spaces(str
);
2036 /* now copy until next white space */
2037 while (*str
&& !isspace(*str
) && field_width
--)
2044 /* return number of characters read so far */
2046 int *i
= (int *)va_arg(args
, int*);
2064 /* looking for '%' in str */
2069 /* invalid format; stop here */
2073 /* have some sort of integer conversion.
2074 * first, skip white space in buffer.
2076 str
= skip_spaces(str
);
2079 if (is_sign
&& digit
== '-')
2083 || (base
== 16 && !isxdigit(digit
))
2084 || (base
== 10 && !isdigit(digit
))
2085 || (base
== 8 && (!isdigit(digit
) || digit
> '7'))
2086 || (base
== 0 && !isdigit(digit
)))
2089 switch (qualifier
) {
2090 case 'H': /* that's 'hh' in format */
2092 signed char *s
= (signed char *)va_arg(args
, signed char *);
2093 *s
= (signed char)simple_strtol(str
, &next
, base
);
2095 unsigned char *s
= (unsigned char *)va_arg(args
, unsigned char *);
2096 *s
= (unsigned char)simple_strtoul(str
, &next
, base
);
2101 short *s
= (short *)va_arg(args
, short *);
2102 *s
= (short)simple_strtol(str
, &next
, base
);
2104 unsigned short *s
= (unsigned short *)va_arg(args
, unsigned short *);
2105 *s
= (unsigned short)simple_strtoul(str
, &next
, base
);
2110 long *l
= (long *)va_arg(args
, long *);
2111 *l
= simple_strtol(str
, &next
, base
);
2113 unsigned long *l
= (unsigned long *)va_arg(args
, unsigned long *);
2114 *l
= simple_strtoul(str
, &next
, base
);
2119 long long *l
= (long long *)va_arg(args
, long long *);
2120 *l
= simple_strtoll(str
, &next
, base
);
2122 unsigned long long *l
= (unsigned long long *)va_arg(args
, unsigned long long *);
2123 *l
= simple_strtoull(str
, &next
, base
);
2129 size_t *s
= (size_t *)va_arg(args
, size_t *);
2130 *s
= (size_t)simple_strtoul(str
, &next
, base
);
2135 int *i
= (int *)va_arg(args
, int *);
2136 *i
= (int)simple_strtol(str
, &next
, base
);
2138 unsigned int *i
= (unsigned int *)va_arg(args
, unsigned int*);
2139 *i
= (unsigned int)simple_strtoul(str
, &next
, base
);
2151 * Now we've come all the way through so either the input string or the
2152 * format ended. In the former case, there can be a %n at the current
2153 * position in the format that needs to be filled.
2155 if (*fmt
== '%' && *(fmt
+ 1) == 'n') {
2156 int *p
= (int *)va_arg(args
, int *);
2162 EXPORT_SYMBOL(vsscanf
);
2165 * sscanf - Unformat a buffer into a list of arguments
2166 * @buf: input buffer
2167 * @fmt: formatting of buffer
2168 * @...: resulting arguments
2170 int sscanf(const char *buf
, const char *fmt
, ...)
2175 va_start(args
, fmt
);
2176 i
= vsscanf(buf
, fmt
, args
);
2181 EXPORT_SYMBOL(sscanf
);