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/clk.h>
21 #include <linux/clk-provider.h>
22 #include <linux/module.h> /* for KSYM_SYMBOL_LEN */
23 #include <linux/types.h>
24 #include <linux/string.h>
25 #include <linux/ctype.h>
26 #include <linux/kernel.h>
27 #include <linux/kallsyms.h>
28 #include <linux/math64.h>
29 #include <linux/uaccess.h>
30 #include <linux/ioport.h>
31 #include <linux/dcache.h>
32 #include <linux/cred.h>
33 #include <linux/uuid.h>
35 #include <net/addrconf.h>
36 #include <linux/siphash.h>
37 #include <linux/compiler.h>
39 #include <linux/blkdev.h>
42 #include "../mm/internal.h" /* For the trace_print_flags arrays */
44 #include <asm/page.h> /* for PAGE_SIZE */
45 #include <asm/sections.h> /* for dereference_function_descriptor() */
46 #include <asm/byteorder.h> /* cpu_to_le16 */
48 #include <linux/string_helpers.h>
52 * simple_strtoull - convert a string to an unsigned long long
53 * @cp: The start of the string
54 * @endp: A pointer to the end of the parsed string will be placed here
55 * @base: The number base to use
57 * This function is obsolete. Please use kstrtoull instead.
59 unsigned long long simple_strtoull(const char *cp
, char **endp
, unsigned int base
)
61 unsigned long long result
;
64 cp
= _parse_integer_fixup_radix(cp
, &base
);
65 rv
= _parse_integer(cp
, base
, &result
);
67 cp
+= (rv
& ~KSTRTOX_OVERFLOW
);
74 EXPORT_SYMBOL(simple_strtoull
);
77 * simple_strtoul - convert a string to an unsigned long
78 * @cp: The start of the string
79 * @endp: A pointer to the end of the parsed string will be placed here
80 * @base: The number base to use
82 * This function is obsolete. Please use kstrtoul instead.
84 unsigned long simple_strtoul(const char *cp
, char **endp
, unsigned int base
)
86 return simple_strtoull(cp
, endp
, base
);
88 EXPORT_SYMBOL(simple_strtoul
);
91 * simple_strtol - convert a string to a signed long
92 * @cp: The start of the string
93 * @endp: A pointer to the end of the parsed string will be placed here
94 * @base: The number base to use
96 * This function is obsolete. Please use kstrtol instead.
98 long simple_strtol(const char *cp
, char **endp
, unsigned int base
)
101 return -simple_strtoul(cp
+ 1, endp
, base
);
103 return simple_strtoul(cp
, endp
, base
);
105 EXPORT_SYMBOL(simple_strtol
);
108 * simple_strtoll - convert a string to a signed long long
109 * @cp: The start of the string
110 * @endp: A pointer to the end of the parsed string will be placed here
111 * @base: The number base to use
113 * This function is obsolete. Please use kstrtoll instead.
115 long long simple_strtoll(const char *cp
, char **endp
, unsigned int base
)
118 return -simple_strtoull(cp
+ 1, endp
, base
);
120 return simple_strtoull(cp
, endp
, base
);
122 EXPORT_SYMBOL(simple_strtoll
);
124 static noinline_for_stack
125 int skip_atoi(const char **s
)
130 i
= i
*10 + *((*s
)++) - '0';
131 } while (isdigit(**s
));
137 * Decimal conversion is by far the most typical, and is used for
138 * /proc and /sys data. This directly impacts e.g. top performance
139 * with many processes running. We optimize it for speed by emitting
140 * two characters at a time, using a 200 byte lookup table. This
141 * roughly halves the number of multiplications compared to computing
142 * the digits one at a time. Implementation strongly inspired by the
143 * previous version, which in turn used ideas described at
144 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
145 * from the author, Douglas W. Jones).
147 * It turns out there is precisely one 26 bit fixed-point
148 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
149 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
150 * range happens to be somewhat larger (x <= 1073741898), but that's
151 * irrelevant for our purpose.
153 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
154 * need a 32x32->64 bit multiply, so we simply use the same constant.
156 * For dividing a number in the range [100, 10^4-1] by 100, there are
157 * several options. The simplest is (x * 0x147b) >> 19, which is valid
158 * for all x <= 43698.
161 static const u16 decpair
[100] = {
162 #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
163 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
164 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
165 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
166 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
167 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
168 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
169 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
170 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
171 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
172 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
177 * This will print a single '0' even if r == 0, since we would
178 * immediately jump to out_r where two 0s would be written but only
179 * one of them accounted for in buf. This is needed by ip4_string
180 * below. All other callers pass a non-zero value of r.
182 static noinline_for_stack
183 char *put_dec_trunc8(char *buf
, unsigned r
)
191 /* 100 <= r < 10^8 */
192 q
= (r
* (u64
)0x28f5c29) >> 32;
193 *((u16
*)buf
) = decpair
[r
- 100*q
];
200 /* 100 <= q < 10^6 */
201 r
= (q
* (u64
)0x28f5c29) >> 32;
202 *((u16
*)buf
) = decpair
[q
- 100*r
];
209 /* 100 <= r < 10^4 */
210 q
= (r
* 0x147b) >> 19;
211 *((u16
*)buf
) = decpair
[r
- 100*q
];
218 *((u16
*)buf
) = decpair
[r
];
219 buf
+= r
< 10 ? 1 : 2;
223 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
224 static noinline_for_stack
225 char *put_dec_full8(char *buf
, unsigned r
)
230 q
= (r
* (u64
)0x28f5c29) >> 32;
231 *((u16
*)buf
) = decpair
[r
- 100*q
];
235 r
= (q
* (u64
)0x28f5c29) >> 32;
236 *((u16
*)buf
) = decpair
[q
- 100*r
];
240 q
= (r
* 0x147b) >> 19;
241 *((u16
*)buf
) = decpair
[r
- 100*q
];
245 *((u16
*)buf
) = decpair
[q
];
250 static noinline_for_stack
251 char *put_dec(char *buf
, unsigned long long n
)
253 if (n
>= 100*1000*1000)
254 buf
= put_dec_full8(buf
, do_div(n
, 100*1000*1000));
255 /* 1 <= n <= 1.6e11 */
256 if (n
>= 100*1000*1000)
257 buf
= put_dec_full8(buf
, do_div(n
, 100*1000*1000));
259 return put_dec_trunc8(buf
, n
);
262 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
265 put_dec_full4(char *buf
, unsigned r
)
270 q
= (r
* 0x147b) >> 19;
271 *((u16
*)buf
) = decpair
[r
- 100*q
];
274 *((u16
*)buf
) = decpair
[q
];
278 * Call put_dec_full4 on x % 10000, return x / 10000.
279 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
280 * holds for all x < 1,128,869,999. The largest value this
281 * helper will ever be asked to convert is 1,125,520,955.
282 * (second call in the put_dec code, assuming n is all-ones).
284 static noinline_for_stack
285 unsigned put_dec_helper4(char *buf
, unsigned x
)
287 uint32_t q
= (x
* (uint64_t)0x346DC5D7) >> 43;
289 put_dec_full4(buf
, x
- q
* 10000);
293 /* Based on code by Douglas W. Jones found at
294 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
295 * (with permission from the author).
296 * Performs no 64-bit division and hence should be fast on 32-bit machines.
299 char *put_dec(char *buf
, unsigned long long n
)
301 uint32_t d3
, d2
, d1
, q
, h
;
303 if (n
< 100*1000*1000)
304 return put_dec_trunc8(buf
, n
);
306 d1
= ((uint32_t)n
>> 16); /* implicit "& 0xffff" */
309 d3
= (h
>> 16); /* implicit "& 0xffff" */
311 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
312 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
313 q
= 656 * d3
+ 7296 * d2
+ 5536 * d1
+ ((uint32_t)n
& 0xffff);
314 q
= put_dec_helper4(buf
, q
);
316 q
+= 7671 * d3
+ 9496 * d2
+ 6 * d1
;
317 q
= put_dec_helper4(buf
+4, q
);
319 q
+= 4749 * d3
+ 42 * d2
;
320 q
= put_dec_helper4(buf
+8, q
);
325 buf
= put_dec_trunc8(buf
, q
);
326 else while (buf
[-1] == '0')
335 * Convert passed number to decimal string.
336 * Returns the length of string. On buffer overflow, returns 0.
338 * If speed is not important, use snprintf(). It's easy to read the code.
340 int num_to_str(char *buf
, int size
, unsigned long long num
)
342 /* put_dec requires 2-byte alignment of the buffer. */
343 char tmp
[sizeof(num
) * 3] __aligned(2);
346 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
351 len
= put_dec(tmp
, num
) - tmp
;
356 for (idx
= 0; idx
< len
; ++idx
)
357 buf
[idx
] = tmp
[len
- idx
- 1];
361 #define SIGN 1 /* unsigned/signed, must be 1 */
362 #define LEFT 2 /* left justified */
363 #define PLUS 4 /* show plus */
364 #define SPACE 8 /* space if plus */
365 #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
366 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
367 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
370 FORMAT_TYPE_NONE
, /* Just a string part */
372 FORMAT_TYPE_PRECISION
,
376 FORMAT_TYPE_PERCENT_CHAR
,
378 FORMAT_TYPE_LONG_LONG
,
392 unsigned int type
:8; /* format_type enum */
393 signed int field_width
:24; /* width of output field */
394 unsigned int flags
:8; /* flags to number() */
395 unsigned int base
:8; /* number base, 8, 10 or 16 only */
396 signed int precision
:16; /* # of digits/chars */
398 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
399 #define PRECISION_MAX ((1 << 15) - 1)
401 static noinline_for_stack
402 char *number(char *buf
, char *end
, unsigned long long num
,
403 struct printf_spec spec
)
405 /* put_dec requires 2-byte alignment of the buffer. */
406 char tmp
[3 * sizeof(num
)] __aligned(2);
409 int need_pfx
= ((spec
.flags
& SPECIAL
) && spec
.base
!= 10);
411 bool is_zero
= num
== 0LL;
412 int field_width
= spec
.field_width
;
413 int precision
= spec
.precision
;
415 BUILD_BUG_ON(sizeof(struct printf_spec
) != 8);
417 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
418 * produces same digits or (maybe lowercased) letters */
419 locase
= (spec
.flags
& SMALL
);
420 if (spec
.flags
& LEFT
)
421 spec
.flags
&= ~ZEROPAD
;
423 if (spec
.flags
& SIGN
) {
424 if ((signed long long)num
< 0) {
426 num
= -(signed long long)num
;
428 } else if (spec
.flags
& PLUS
) {
431 } else if (spec
.flags
& SPACE
) {
443 /* generate full string in tmp[], in reverse order */
446 tmp
[i
++] = hex_asc_upper
[num
] | locase
;
447 else if (spec
.base
!= 10) { /* 8 or 16 */
448 int mask
= spec
.base
- 1;
454 tmp
[i
++] = (hex_asc_upper
[((unsigned char)num
) & mask
] | locase
);
457 } else { /* base 10 */
458 i
= put_dec(tmp
, num
) - tmp
;
461 /* printing 100 using %2d gives "100", not "00" */
464 /* leading space padding */
465 field_width
-= precision
;
466 if (!(spec
.flags
& (ZEROPAD
| LEFT
))) {
467 while (--field_width
>= 0) {
479 /* "0x" / "0" prefix */
481 if (spec
.base
== 16 || !is_zero
) {
486 if (spec
.base
== 16) {
488 *buf
= ('X' | locase
);
492 /* zero or space padding */
493 if (!(spec
.flags
& LEFT
)) {
494 char c
= ' ' + (spec
.flags
& ZEROPAD
);
495 BUILD_BUG_ON(' ' + ZEROPAD
!= '0');
496 while (--field_width
>= 0) {
502 /* hmm even more zero padding? */
503 while (i
<= --precision
) {
508 /* actual digits of result */
514 /* trailing space padding */
515 while (--field_width
>= 0) {
524 static noinline_for_stack
525 char *special_hex_number(char *buf
, char *end
, unsigned long long num
, int size
)
527 struct printf_spec spec
;
529 spec
.type
= FORMAT_TYPE_PTR
;
530 spec
.field_width
= 2 + 2 * size
; /* 0x + hex */
531 spec
.flags
= SPECIAL
| SMALL
| ZEROPAD
;
535 return number(buf
, end
, num
, spec
);
538 static void move_right(char *buf
, char *end
, unsigned len
, unsigned spaces
)
541 if (buf
>= end
) /* nowhere to put anything */
544 if (size
<= spaces
) {
545 memset(buf
, ' ', size
);
549 if (len
> size
- spaces
)
551 memmove(buf
+ spaces
, buf
, len
);
553 memset(buf
, ' ', spaces
);
557 * Handle field width padding for a string.
558 * @buf: current buffer position
559 * @n: length of string
560 * @end: end of output buffer
561 * @spec: for field width and flags
562 * Returns: new buffer position after padding.
564 static noinline_for_stack
565 char *widen_string(char *buf
, int n
, char *end
, struct printf_spec spec
)
569 if (likely(n
>= spec
.field_width
))
571 /* we want to pad the sucker */
572 spaces
= spec
.field_width
- n
;
573 if (!(spec
.flags
& LEFT
)) {
574 move_right(buf
- n
, end
, n
, spaces
);
585 static noinline_for_stack
586 char *string(char *buf
, char *end
, const char *s
, struct printf_spec spec
)
589 size_t lim
= spec
.precision
;
591 if ((unsigned long)s
< PAGE_SIZE
)
603 return widen_string(buf
, len
, end
, spec
);
606 static noinline_for_stack
607 char *dentry_name(char *buf
, char *end
, const struct dentry
*d
, struct printf_spec spec
,
610 const char *array
[4], *s
;
611 const struct dentry
*p
;
616 case '2': case '3': case '4':
617 depth
= fmt
[1] - '0';
624 for (i
= 0; i
< depth
; i
++, d
= p
) {
625 p
= READ_ONCE(d
->d_parent
);
626 array
[i
] = READ_ONCE(d
->d_name
.name
);
635 for (n
= 0; n
!= spec
.precision
; n
++, buf
++) {
647 return widen_string(buf
, n
, end
, spec
);
651 static noinline_for_stack
652 char *bdev_name(char *buf
, char *end
, struct block_device
*bdev
,
653 struct printf_spec spec
, const char *fmt
)
655 struct gendisk
*hd
= bdev
->bd_disk
;
657 buf
= string(buf
, end
, hd
->disk_name
, spec
);
658 if (bdev
->bd_part
->partno
) {
659 if (isdigit(hd
->disk_name
[strlen(hd
->disk_name
)-1])) {
664 buf
= number(buf
, end
, bdev
->bd_part
->partno
, spec
);
670 static noinline_for_stack
671 char *symbol_string(char *buf
, char *end
, void *ptr
,
672 struct printf_spec spec
, const char *fmt
)
675 #ifdef CONFIG_KALLSYMS
676 char sym
[KSYM_SYMBOL_LEN
];
680 ptr
= __builtin_extract_return_addr(ptr
);
681 value
= (unsigned long)ptr
;
683 #ifdef CONFIG_KALLSYMS
685 sprint_backtrace(sym
, value
);
686 else if (*fmt
!= 'f' && *fmt
!= 's')
687 sprint_symbol(sym
, value
);
689 sprint_symbol_no_offset(sym
, value
);
691 return string(buf
, end
, sym
, spec
);
693 return special_hex_number(buf
, end
, value
, sizeof(void *));
697 static noinline_for_stack
698 char *resource_string(char *buf
, char *end
, struct resource
*res
,
699 struct printf_spec spec
, const char *fmt
)
701 #ifndef IO_RSRC_PRINTK_SIZE
702 #define IO_RSRC_PRINTK_SIZE 6
705 #ifndef MEM_RSRC_PRINTK_SIZE
706 #define MEM_RSRC_PRINTK_SIZE 10
708 static const struct printf_spec io_spec
= {
710 .field_width
= IO_RSRC_PRINTK_SIZE
,
712 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
714 static const struct printf_spec mem_spec
= {
716 .field_width
= MEM_RSRC_PRINTK_SIZE
,
718 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
720 static const struct printf_spec bus_spec
= {
724 .flags
= SMALL
| ZEROPAD
,
726 static const struct printf_spec dec_spec
= {
731 static const struct printf_spec str_spec
= {
736 static const struct printf_spec flag_spec
= {
739 .flags
= SPECIAL
| SMALL
,
742 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
743 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
744 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
745 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
746 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
747 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
748 char sym
[max(2*RSRC_BUF_SIZE
+ DECODED_BUF_SIZE
,
749 2*RSRC_BUF_SIZE
+ FLAG_BUF_SIZE
+ RAW_BUF_SIZE
)];
751 char *p
= sym
, *pend
= sym
+ sizeof(sym
);
752 int decode
= (fmt
[0] == 'R') ? 1 : 0;
753 const struct printf_spec
*specp
;
756 if (res
->flags
& IORESOURCE_IO
) {
757 p
= string(p
, pend
, "io ", str_spec
);
759 } else if (res
->flags
& IORESOURCE_MEM
) {
760 p
= string(p
, pend
, "mem ", str_spec
);
762 } else if (res
->flags
& IORESOURCE_IRQ
) {
763 p
= string(p
, pend
, "irq ", str_spec
);
765 } else if (res
->flags
& IORESOURCE_DMA
) {
766 p
= string(p
, pend
, "dma ", str_spec
);
768 } else if (res
->flags
& IORESOURCE_BUS
) {
769 p
= string(p
, pend
, "bus ", str_spec
);
772 p
= string(p
, pend
, "??? ", str_spec
);
776 if (decode
&& res
->flags
& IORESOURCE_UNSET
) {
777 p
= string(p
, pend
, "size ", str_spec
);
778 p
= number(p
, pend
, resource_size(res
), *specp
);
780 p
= number(p
, pend
, res
->start
, *specp
);
781 if (res
->start
!= res
->end
) {
783 p
= number(p
, pend
, res
->end
, *specp
);
787 if (res
->flags
& IORESOURCE_MEM_64
)
788 p
= string(p
, pend
, " 64bit", str_spec
);
789 if (res
->flags
& IORESOURCE_PREFETCH
)
790 p
= string(p
, pend
, " pref", str_spec
);
791 if (res
->flags
& IORESOURCE_WINDOW
)
792 p
= string(p
, pend
, " window", str_spec
);
793 if (res
->flags
& IORESOURCE_DISABLED
)
794 p
= string(p
, pend
, " disabled", str_spec
);
796 p
= string(p
, pend
, " flags ", str_spec
);
797 p
= number(p
, pend
, res
->flags
, flag_spec
);
802 return string(buf
, end
, sym
, spec
);
805 static noinline_for_stack
806 char *hex_string(char *buf
, char *end
, u8
*addr
, struct printf_spec spec
,
809 int i
, len
= 1; /* if we pass '%ph[CDN]', field width remains
810 negative value, fallback to the default */
813 if (spec
.field_width
== 0)
814 /* nothing to print */
817 if (ZERO_OR_NULL_PTR(addr
))
819 return string(buf
, end
, NULL
, spec
);
836 if (spec
.field_width
> 0)
837 len
= min_t(int, spec
.field_width
, 64);
839 for (i
= 0; i
< len
; ++i
) {
841 *buf
= hex_asc_hi(addr
[i
]);
844 *buf
= hex_asc_lo(addr
[i
]);
847 if (separator
&& i
!= len
- 1) {
857 static noinline_for_stack
858 char *bitmap_string(char *buf
, char *end
, unsigned long *bitmap
,
859 struct printf_spec spec
, const char *fmt
)
861 const int CHUNKSZ
= 32;
862 int nr_bits
= max_t(int, spec
.field_width
, 0);
866 /* reused to print numbers */
867 spec
= (struct printf_spec
){ .flags
= SMALL
| ZEROPAD
, .base
= 16 };
869 chunksz
= nr_bits
& (CHUNKSZ
- 1);
873 i
= ALIGN(nr_bits
, CHUNKSZ
) - CHUNKSZ
;
874 for (; i
>= 0; i
-= CHUNKSZ
) {
878 chunkmask
= ((1ULL << chunksz
) - 1);
879 word
= i
/ BITS_PER_LONG
;
880 bit
= i
% BITS_PER_LONG
;
881 val
= (bitmap
[word
] >> bit
) & chunkmask
;
890 spec
.field_width
= DIV_ROUND_UP(chunksz
, 4);
891 buf
= number(buf
, end
, val
, spec
);
898 static noinline_for_stack
899 char *bitmap_list_string(char *buf
, char *end
, unsigned long *bitmap
,
900 struct printf_spec spec
, const char *fmt
)
902 int nr_bits
= max_t(int, spec
.field_width
, 0);
903 /* current bit is 'cur', most recently seen range is [rbot, rtop] */
907 /* reused to print numbers */
908 spec
= (struct printf_spec
){ .base
= 10 };
910 rbot
= cur
= find_first_bit(bitmap
, nr_bits
);
911 while (cur
< nr_bits
) {
913 cur
= find_next_bit(bitmap
, nr_bits
, cur
+ 1);
914 if (cur
< nr_bits
&& cur
<= rtop
+ 1)
924 buf
= number(buf
, end
, rbot
, spec
);
930 buf
= number(buf
, end
, rtop
, spec
);
938 static noinline_for_stack
939 char *mac_address_string(char *buf
, char *end
, u8
*addr
,
940 struct printf_spec spec
, const char *fmt
)
942 char mac_addr
[sizeof("xx:xx:xx:xx:xx:xx")];
946 bool reversed
= false;
962 for (i
= 0; i
< 6; i
++) {
964 p
= hex_byte_pack(p
, addr
[5 - i
]);
966 p
= hex_byte_pack(p
, addr
[i
]);
968 if (fmt
[0] == 'M' && i
!= 5)
973 return string(buf
, end
, mac_addr
, spec
);
976 static noinline_for_stack
977 char *ip4_string(char *p
, const u8
*addr
, const char *fmt
)
980 bool leading_zeros
= (fmt
[0] == 'i');
1005 for (i
= 0; i
< 4; i
++) {
1006 char temp
[4] __aligned(2); /* hold each IP quad in reverse order */
1007 int digits
= put_dec_trunc8(temp
, addr
[index
]) - temp
;
1008 if (leading_zeros
) {
1014 /* reverse the digits in the quad */
1016 *p
++ = temp
[digits
];
1026 static noinline_for_stack
1027 char *ip6_compressed_string(char *p
, const char *addr
)
1030 unsigned char zerolength
[8];
1035 bool needcolon
= false;
1037 struct in6_addr in6
;
1039 memcpy(&in6
, addr
, sizeof(struct in6_addr
));
1041 useIPv4
= ipv6_addr_v4mapped(&in6
) || ipv6_addr_is_isatap(&in6
);
1043 memset(zerolength
, 0, sizeof(zerolength
));
1050 /* find position of longest 0 run */
1051 for (i
= 0; i
< range
; i
++) {
1052 for (j
= i
; j
< range
; j
++) {
1053 if (in6
.s6_addr16
[j
] != 0)
1058 for (i
= 0; i
< range
; i
++) {
1059 if (zerolength
[i
] > longest
) {
1060 longest
= zerolength
[i
];
1064 if (longest
== 1) /* don't compress a single 0 */
1068 for (i
= 0; i
< range
; i
++) {
1069 if (i
== colonpos
) {
1070 if (needcolon
|| i
== 0)
1081 /* hex u16 without leading 0s */
1082 word
= ntohs(in6
.s6_addr16
[i
]);
1087 p
= hex_byte_pack(p
, hi
);
1089 *p
++ = hex_asc_lo(hi
);
1090 p
= hex_byte_pack(p
, lo
);
1093 p
= hex_byte_pack(p
, lo
);
1095 *p
++ = hex_asc_lo(lo
);
1102 p
= ip4_string(p
, &in6
.s6_addr
[12], "I4");
1109 static noinline_for_stack
1110 char *ip6_string(char *p
, const char *addr
, const char *fmt
)
1114 for (i
= 0; i
< 8; i
++) {
1115 p
= hex_byte_pack(p
, *addr
++);
1116 p
= hex_byte_pack(p
, *addr
++);
1117 if (fmt
[0] == 'I' && i
!= 7)
1125 static noinline_for_stack
1126 char *ip6_addr_string(char *buf
, char *end
, const u8
*addr
,
1127 struct printf_spec spec
, const char *fmt
)
1129 char ip6_addr
[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1131 if (fmt
[0] == 'I' && fmt
[2] == 'c')
1132 ip6_compressed_string(ip6_addr
, addr
);
1134 ip6_string(ip6_addr
, addr
, fmt
);
1136 return string(buf
, end
, ip6_addr
, spec
);
1139 static noinline_for_stack
1140 char *ip4_addr_string(char *buf
, char *end
, const u8
*addr
,
1141 struct printf_spec spec
, const char *fmt
)
1143 char ip4_addr
[sizeof("255.255.255.255")];
1145 ip4_string(ip4_addr
, addr
, fmt
);
1147 return string(buf
, end
, ip4_addr
, spec
);
1150 static noinline_for_stack
1151 char *ip6_addr_string_sa(char *buf
, char *end
, const struct sockaddr_in6
*sa
,
1152 struct printf_spec spec
, const char *fmt
)
1154 bool have_p
= false, have_s
= false, have_f
= false, have_c
= false;
1155 char ip6_addr
[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1156 sizeof(":12345") + sizeof("/123456789") +
1157 sizeof("%1234567890")];
1158 char *p
= ip6_addr
, *pend
= ip6_addr
+ sizeof(ip6_addr
);
1159 const u8
*addr
= (const u8
*) &sa
->sin6_addr
;
1160 char fmt6
[2] = { fmt
[0], '6' };
1164 while (isalpha(*++fmt
)) {
1181 if (have_p
|| have_s
|| have_f
) {
1186 if (fmt6
[0] == 'I' && have_c
)
1187 p
= ip6_compressed_string(ip6_addr
+ off
, addr
);
1189 p
= ip6_string(ip6_addr
+ off
, addr
, fmt6
);
1191 if (have_p
|| have_s
|| have_f
)
1196 p
= number(p
, pend
, ntohs(sa
->sin6_port
), spec
);
1200 p
= number(p
, pend
, ntohl(sa
->sin6_flowinfo
&
1201 IPV6_FLOWINFO_MASK
), spec
);
1205 p
= number(p
, pend
, sa
->sin6_scope_id
, spec
);
1209 return string(buf
, end
, ip6_addr
, spec
);
1212 static noinline_for_stack
1213 char *ip4_addr_string_sa(char *buf
, char *end
, const struct sockaddr_in
*sa
,
1214 struct printf_spec spec
, const char *fmt
)
1216 bool have_p
= false;
1217 char *p
, ip4_addr
[sizeof("255.255.255.255") + sizeof(":12345")];
1218 char *pend
= ip4_addr
+ sizeof(ip4_addr
);
1219 const u8
*addr
= (const u8
*) &sa
->sin_addr
.s_addr
;
1220 char fmt4
[3] = { fmt
[0], '4', 0 };
1223 while (isalpha(*++fmt
)) {
1237 p
= ip4_string(ip4_addr
, addr
, fmt4
);
1240 p
= number(p
, pend
, ntohs(sa
->sin_port
), spec
);
1244 return string(buf
, end
, ip4_addr
, spec
);
1247 static noinline_for_stack
1248 char *escaped_string(char *buf
, char *end
, u8
*addr
, struct printf_spec spec
,
1253 unsigned int flags
= 0;
1256 if (spec
.field_width
== 0)
1257 return buf
; /* nothing to print */
1259 if (ZERO_OR_NULL_PTR(addr
))
1260 return string(buf
, end
, NULL
, spec
); /* NULL pointer */
1264 switch (fmt
[count
++]) {
1266 flags
|= ESCAPE_ANY
;
1269 flags
|= ESCAPE_SPECIAL
;
1272 flags
|= ESCAPE_HEX
;
1275 flags
|= ESCAPE_NULL
;
1278 flags
|= ESCAPE_OCTAL
;
1284 flags
|= ESCAPE_SPACE
;
1293 flags
= ESCAPE_ANY_NP
;
1295 len
= spec
.field_width
< 0 ? 1 : spec
.field_width
;
1298 * string_escape_mem() writes as many characters as it can to
1299 * the given buffer, and returns the total size of the output
1300 * had the buffer been big enough.
1302 buf
+= string_escape_mem(addr
, len
, buf
, buf
< end
? end
- buf
: 0, flags
, NULL
);
1307 static noinline_for_stack
1308 char *uuid_string(char *buf
, char *end
, const u8
*addr
,
1309 struct printf_spec spec
, const char *fmt
)
1311 char uuid
[UUID_STRING_LEN
+ 1];
1314 const u8
*index
= uuid_index
;
1319 uc
= true; /* fall-through */
1328 for (i
= 0; i
< 16; i
++) {
1330 p
= hex_byte_pack_upper(p
, addr
[index
[i
]]);
1332 p
= hex_byte_pack(p
, addr
[index
[i
]]);
1345 return string(buf
, end
, uuid
, spec
);
1348 int kptr_restrict __read_mostly
;
1350 static noinline_for_stack
1351 char *restricted_pointer(char *buf
, char *end
, const void *ptr
,
1352 struct printf_spec spec
)
1355 spec
.flags
|= SMALL
;
1356 if (spec
.field_width
== -1) {
1357 spec
.field_width
= 2 * sizeof(ptr
);
1358 spec
.flags
|= ZEROPAD
;
1361 switch (kptr_restrict
) {
1363 /* Always print %pK values */
1366 const struct cred
*cred
;
1369 * kptr_restrict==1 cannot be used in IRQ context
1370 * because its test for CAP_SYSLOG would be meaningless.
1372 if (in_irq() || in_serving_softirq() || in_nmi())
1373 return string(buf
, end
, "pK-error", spec
);
1376 * Only print the real pointer value if the current
1377 * process has CAP_SYSLOG and is running with the
1378 * same credentials it started with. This is because
1379 * access to files is checked at open() time, but %pK
1380 * checks permission at read() time. We don't want to
1381 * leak pointer values if a binary opens a file using
1382 * %pK and then elevates privileges before reading it.
1384 cred
= current_cred();
1385 if (!has_capability_noaudit(current
, CAP_SYSLOG
) ||
1386 !uid_eq(cred
->euid
, cred
->uid
) ||
1387 !gid_eq(cred
->egid
, cred
->gid
))
1393 /* Always print 0's for %pK */
1398 return number(buf
, end
, (unsigned long)ptr
, spec
);
1401 static noinline_for_stack
1402 char *netdev_bits(char *buf
, char *end
, const void *addr
, const char *fmt
)
1404 unsigned long long num
;
1409 num
= *(const netdev_features_t
*)addr
;
1410 size
= sizeof(netdev_features_t
);
1413 num
= (unsigned long)addr
;
1414 size
= sizeof(unsigned long);
1418 return special_hex_number(buf
, end
, num
, size
);
1421 static noinline_for_stack
1422 char *address_val(char *buf
, char *end
, const void *addr
, const char *fmt
)
1424 unsigned long long num
;
1429 num
= *(const dma_addr_t
*)addr
;
1430 size
= sizeof(dma_addr_t
);
1434 num
= *(const phys_addr_t
*)addr
;
1435 size
= sizeof(phys_addr_t
);
1439 return special_hex_number(buf
, end
, num
, size
);
1442 static noinline_for_stack
1443 char *clock(char *buf
, char *end
, struct clk
*clk
, struct printf_spec spec
,
1446 if (!IS_ENABLED(CONFIG_HAVE_CLK
) || !clk
)
1447 return string(buf
, end
, NULL
, spec
);
1451 return number(buf
, end
, clk_get_rate(clk
), spec
);
1455 #ifdef CONFIG_COMMON_CLK
1456 return string(buf
, end
, __clk_get_name(clk
), spec
);
1458 return special_hex_number(buf
, end
, (unsigned long)clk
, sizeof(unsigned long));
1464 char *format_flags(char *buf
, char *end
, unsigned long flags
,
1465 const struct trace_print_flags
*names
)
1468 const struct printf_spec strspec
= {
1472 const struct printf_spec numspec
= {
1473 .flags
= SPECIAL
|SMALL
,
1479 for ( ; flags
&& names
->name
; names
++) {
1481 if ((flags
& mask
) != mask
)
1484 buf
= string(buf
, end
, names
->name
, strspec
);
1495 buf
= number(buf
, end
, flags
, numspec
);
1500 static noinline_for_stack
1501 char *flags_string(char *buf
, char *end
, void *flags_ptr
, const char *fmt
)
1503 unsigned long flags
;
1504 const struct trace_print_flags
*names
;
1508 flags
= *(unsigned long *)flags_ptr
;
1509 /* Remove zone id */
1510 flags
&= (1UL << NR_PAGEFLAGS
) - 1;
1511 names
= pageflag_names
;
1514 flags
= *(unsigned long *)flags_ptr
;
1515 names
= vmaflag_names
;
1518 flags
= *(gfp_t
*)flags_ptr
;
1519 names
= gfpflag_names
;
1522 WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt
[1]);
1526 return format_flags(buf
, end
, flags
, names
);
1529 static const char *device_node_name_for_depth(const struct device_node
*np
, int depth
)
1531 for ( ; np
&& depth
; depth
--)
1534 return kbasename(np
->full_name
);
1537 static noinline_for_stack
1538 char *device_node_gen_full_name(const struct device_node
*np
, char *buf
, char *end
)
1541 const struct device_node
*parent
= np
->parent
;
1542 static const struct printf_spec strspec
= {
1547 /* special case for root node */
1549 return string(buf
, end
, "/", strspec
);
1551 for (depth
= 0; parent
->parent
; depth
++)
1552 parent
= parent
->parent
;
1554 for ( ; depth
>= 0; depth
--) {
1555 buf
= string(buf
, end
, "/", strspec
);
1556 buf
= string(buf
, end
, device_node_name_for_depth(np
, depth
),
1562 static noinline_for_stack
1563 char *device_node_string(char *buf
, char *end
, struct device_node
*dn
,
1564 struct printf_spec spec
, const char *fmt
)
1566 char tbuf
[sizeof("xxxx") + 1];
1569 char *buf_start
= buf
;
1570 struct property
*prop
;
1571 bool has_mult
, pass
;
1572 static const struct printf_spec num_spec
= {
1579 struct printf_spec str_spec
= spec
;
1580 str_spec
.field_width
= -1;
1582 if (!IS_ENABLED(CONFIG_OF
))
1583 return string(buf
, end
, "(!OF)", spec
);
1585 if ((unsigned long)dn
< PAGE_SIZE
)
1586 return string(buf
, end
, "(null)", spec
);
1588 /* simple case without anything any more format specifiers */
1590 if (fmt
[0] == '\0' || strcspn(fmt
,"fnpPFcC") > 0)
1593 for (pass
= false; strspn(fmt
,"fnpPFcC"); fmt
++, pass
= true) {
1601 case 'f': /* full_name */
1602 buf
= device_node_gen_full_name(dn
, buf
, end
);
1604 case 'n': /* name */
1605 buf
= string(buf
, end
, dn
->name
, str_spec
);
1607 case 'p': /* phandle */
1608 buf
= number(buf
, end
, (unsigned int)dn
->phandle
, num_spec
);
1610 case 'P': /* path-spec */
1611 p
= kbasename(of_node_full_name(dn
));
1614 buf
= string(buf
, end
, p
, str_spec
);
1616 case 'F': /* flags */
1617 tbuf
[0] = of_node_check_flag(dn
, OF_DYNAMIC
) ? 'D' : '-';
1618 tbuf
[1] = of_node_check_flag(dn
, OF_DETACHED
) ? 'd' : '-';
1619 tbuf
[2] = of_node_check_flag(dn
, OF_POPULATED
) ? 'P' : '-';
1620 tbuf
[3] = of_node_check_flag(dn
, OF_POPULATED_BUS
) ? 'B' : '-';
1622 buf
= string(buf
, end
, tbuf
, str_spec
);
1624 case 'c': /* major compatible string */
1625 ret
= of_property_read_string(dn
, "compatible", &p
);
1627 buf
= string(buf
, end
, p
, str_spec
);
1629 case 'C': /* full compatible string */
1631 of_property_for_each_string(dn
, "compatible", prop
, p
) {
1633 buf
= string(buf
, end
, ",", str_spec
);
1634 buf
= string(buf
, end
, "\"", str_spec
);
1635 buf
= string(buf
, end
, p
, str_spec
);
1636 buf
= string(buf
, end
, "\"", str_spec
);
1646 return widen_string(buf
, buf
- buf_start
, end
, spec
);
1649 static noinline_for_stack
1650 char *pointer_string(char *buf
, char *end
, const void *ptr
,
1651 struct printf_spec spec
)
1654 spec
.flags
|= SMALL
;
1655 if (spec
.field_width
== -1) {
1656 spec
.field_width
= 2 * sizeof(ptr
);
1657 spec
.flags
|= ZEROPAD
;
1660 return number(buf
, end
, (unsigned long int)ptr
, spec
);
1663 static bool have_filled_random_ptr_key __read_mostly
;
1664 static siphash_key_t ptr_key __read_mostly
;
1666 static void fill_random_ptr_key(struct random_ready_callback
*unused
)
1668 get_random_bytes(&ptr_key
, sizeof(ptr_key
));
1670 * have_filled_random_ptr_key==true is dependent on get_random_bytes().
1671 * ptr_to_id() needs to see have_filled_random_ptr_key==true
1672 * after get_random_bytes() returns.
1675 WRITE_ONCE(have_filled_random_ptr_key
, true);
1678 static struct random_ready_callback random_ready
= {
1679 .func
= fill_random_ptr_key
1682 static int __init
initialize_ptr_random(void)
1684 int ret
= add_random_ready_callback(&random_ready
);
1688 } else if (ret
== -EALREADY
) {
1689 fill_random_ptr_key(&random_ready
);
1695 early_initcall(initialize_ptr_random
);
1697 /* Maps a pointer to a 32 bit unique identifier. */
1698 static char *ptr_to_id(char *buf
, char *end
, void *ptr
, struct printf_spec spec
)
1700 unsigned long hashval
;
1701 const int default_width
= 2 * sizeof(ptr
);
1703 if (unlikely(!have_filled_random_ptr_key
)) {
1704 spec
.field_width
= default_width
;
1705 /* string length must be less than default_width */
1706 return string(buf
, end
, "(ptrval)", spec
);
1710 hashval
= (unsigned long)siphash_1u64((u64
)ptr
, &ptr_key
);
1712 * Mask off the first 32 bits, this makes explicit that we have
1713 * modified the address (and 32 bits is plenty for a unique ID).
1715 hashval
= hashval
& 0xffffffff;
1717 hashval
= (unsigned long)siphash_1u32((u32
)ptr
, &ptr_key
);
1720 spec
.flags
|= SMALL
;
1721 if (spec
.field_width
== -1) {
1722 spec
.field_width
= default_width
;
1723 spec
.flags
|= ZEROPAD
;
1727 return number(buf
, end
, hashval
, spec
);
1730 #ifdef CONFIG_KMSG_IDS
1732 unsigned long long __jhash_string(const char *str
);
1734 static noinline_for_stack
1735 char *jhash_string(char *buf
, char *end
, const char *str
, const char *fmt
)
1737 struct printf_spec spec
;
1738 unsigned long long num
;
1740 num
= __jhash_string(str
);
1742 spec
.type
= FORMAT_TYPE_PTR
;
1743 spec
.field_width
= 6;
1744 spec
.flags
= SMALL
| ZEROPAD
;
1746 spec
.precision
= -1;
1748 return number(buf
, end
, num
, spec
);
1754 * Show a '%p' thing. A kernel extension is that the '%p' is followed
1755 * by an extra set of alphanumeric characters that are extended format
1758 * Please update scripts/checkpatch.pl when adding/removing conversion
1759 * characters. (Search for "check for vsprintf extension").
1761 * Right now we handle:
1763 * - 'F' For symbolic function descriptor pointers with offset
1764 * - 'f' For simple symbolic function names without offset
1765 * - 'S' For symbolic direct pointers with offset
1766 * - 's' For symbolic direct pointers without offset
1767 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
1768 * - 'B' For backtraced symbolic direct pointers with offset
1769 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
1770 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
1771 * - 'b[l]' For a bitmap, the number of bits is determined by the field
1772 * width which must be explicitly specified either as part of the
1773 * format string '%32b[l]' or through '%*b[l]', [l] selects
1774 * range-list format instead of hex format
1775 * - 'M' For a 6-byte MAC address, it prints the address in the
1776 * usual colon-separated hex notation
1777 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
1778 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
1779 * with a dash-separated hex notation
1780 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
1781 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
1782 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
1783 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
1785 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1786 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1787 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
1788 * IPv6 omits the colons (01020304...0f)
1789 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
1791 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1792 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1793 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
1794 * - 'I[6S]c' for IPv6 addresses printed as specified by
1795 * http://tools.ietf.org/html/rfc5952
1796 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
1797 * of the following flags (see string_escape_mem() for the
1800 * c - ESCAPE_SPECIAL
1806 * By default ESCAPE_ANY_NP is used.
1807 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
1808 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
1809 * Options for %pU are:
1810 * b big endian lower case hex (default)
1811 * B big endian UPPER case hex
1812 * l little endian lower case hex
1813 * L little endian UPPER case hex
1814 * big endian output byte order is:
1815 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
1816 * little endian output byte order is:
1817 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
1818 * - 'V' For a struct va_format which contains a format string * and va_list *,
1819 * call vsnprintf(->format, *->va_list).
1820 * Implements a "recursive vsnprintf".
1821 * Do not use this feature without some mechanism to verify the
1822 * correctness of the format string and va_list arguments.
1823 * - 'K' For a kernel pointer that should be hidden from unprivileged users
1824 * - 'NF' For a netdev_features_t
1825 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
1826 * a certain separator (' ' by default):
1830 * The maximum supported length is 64 bytes of the input. Consider
1831 * to use print_hex_dump() for the larger input.
1832 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
1833 * (default assumed to be phys_addr_t, passed by reference)
1834 * - 'd[234]' For a dentry name (optionally 2-4 last components)
1835 * - 'D[234]' Same as 'd' but for a struct file
1836 * - 'g' For block_device name (gendisk + partition number)
1837 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
1838 * (legacy clock framework) of the clock
1839 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
1840 * (legacy clock framework) of the clock
1841 * - 'Cr' For a clock, it prints the current rate of the clock
1842 * - 'G' For flags to be printed as a collection of symbolic strings that would
1843 * construct the specific value. Supported flags given by option:
1844 * p page flags (see struct page) given as pointer to unsigned long
1845 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
1846 * v vma flags (VM_*) given as pointer to unsigned long
1847 * - 'j' Kernel message catalog jhash for System z
1848 * - 'O' For a kobject based struct. Must be one of the following:
1849 * - 'OF[fnpPcCF]' For a device tree object
1850 * Without any optional arguments prints the full_name
1851 * f device node full_name
1852 * n device node name
1853 * p device node phandle
1854 * P device node path spec (name + @unit)
1855 * F device node flags
1856 * c major compatible string
1857 * C full compatible string
1859 * - 'x' For printing the address. Equivalent to "%lx".
1861 * ** Please update also Documentation/printk-formats.txt when making changes **
1863 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
1864 * function pointers are really function descriptors, which contain a
1865 * pointer to the real address.
1867 * Note: The default behaviour (unadorned %p) is to hash the address,
1868 * rendering it useful as a unique identifier.
1870 static noinline_for_stack
1871 char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
1872 struct printf_spec spec
)
1874 const int default_width
= 2 * sizeof(void *);
1876 if (!ptr
&& *fmt
!= 'K') {
1878 * Print (null) with the same width as a pointer so it makes
1879 * tabular output look nice.
1881 if (spec
.field_width
== -1)
1882 spec
.field_width
= default_width
;
1883 return string(buf
, end
, "(null)", spec
);
1889 ptr
= dereference_function_descriptor(ptr
);
1894 return symbol_string(buf
, end
, ptr
, spec
, fmt
);
1897 return resource_string(buf
, end
, ptr
, spec
, fmt
);
1899 return hex_string(buf
, end
, ptr
, spec
, fmt
);
1903 return bitmap_list_string(buf
, end
, ptr
, spec
, fmt
);
1905 return bitmap_string(buf
, end
, ptr
, spec
, fmt
);
1907 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1908 case 'm': /* Contiguous: 000102030405 */
1910 /* [mM]R (Reverse order; Bluetooth) */
1911 return mac_address_string(buf
, end
, ptr
, spec
, fmt
);
1912 case 'I': /* Formatted IP supported
1914 * 6: 0001:0203:...:0708
1915 * 6c: 1::708 or 1::1.2.3.4
1917 case 'i': /* Contiguous:
1918 * 4: 001.002.003.004
1923 return ip6_addr_string(buf
, end
, ptr
, spec
, fmt
);
1925 return ip4_addr_string(buf
, end
, ptr
, spec
, fmt
);
1928 struct sockaddr raw
;
1929 struct sockaddr_in v4
;
1930 struct sockaddr_in6 v6
;
1933 switch (sa
->raw
.sa_family
) {
1935 return ip4_addr_string_sa(buf
, end
, &sa
->v4
, spec
, fmt
);
1937 return ip6_addr_string_sa(buf
, end
, &sa
->v6
, spec
, fmt
);
1939 return string(buf
, end
, "(invalid address)", spec
);
1944 return escaped_string(buf
, end
, ptr
, spec
, fmt
);
1946 return uuid_string(buf
, end
, ptr
, spec
, fmt
);
1951 va_copy(va
, *((struct va_format
*)ptr
)->va
);
1952 buf
+= vsnprintf(buf
, end
> buf
? end
- buf
: 0,
1953 ((struct va_format
*)ptr
)->fmt
, va
);
1960 return restricted_pointer(buf
, end
, ptr
, spec
);
1962 return netdev_bits(buf
, end
, ptr
, fmt
);
1964 return address_val(buf
, end
, ptr
, fmt
);
1966 return dentry_name(buf
, end
, ptr
, spec
, fmt
);
1968 return clock(buf
, end
, ptr
, spec
, fmt
);
1970 return dentry_name(buf
, end
,
1971 ((const struct file
*)ptr
)->f_path
.dentry
,
1975 return bdev_name(buf
, end
, ptr
, spec
, fmt
);
1979 return flags_string(buf
, end
, ptr
, fmt
);
1983 return device_node_string(buf
, end
, ptr
, spec
, fmt
+ 1);
1986 return pointer_string(buf
, end
, ptr
, spec
);
1987 #ifdef CONFIG_KMSG_IDS
1989 return jhash_string(buf
, end
, ptr
, fmt
);
1993 /* default is to _not_ leak addresses, hash before printing */
1994 return ptr_to_id(buf
, end
, ptr
, spec
);
1998 * Helper function to decode printf style format.
1999 * Each call decode a token from the format and return the
2000 * number of characters read (or likely the delta where it wants
2001 * to go on the next call).
2002 * The decoded token is returned through the parameters
2004 * 'h', 'l', or 'L' for integer fields
2005 * 'z' support added 23/7/1999 S.H.
2006 * 'z' changed to 'Z' --davidm 1/25/99
2007 * 'Z' changed to 'z' --adobriyan 2017-01-25
2008 * 't' added for ptrdiff_t
2010 * @fmt: the format string
2011 * @type of the token returned
2012 * @flags: various flags such as +, -, # tokens..
2013 * @field_width: overwritten width
2014 * @base: base of the number (octal, hex, ...)
2015 * @precision: precision of a number
2016 * @qualifier: qualifier of a number (long, size_t, ...)
2018 static noinline_for_stack
2019 int format_decode(const char *fmt
, struct printf_spec
*spec
)
2021 const char *start
= fmt
;
2024 /* we finished early by reading the field width */
2025 if (spec
->type
== FORMAT_TYPE_WIDTH
) {
2026 if (spec
->field_width
< 0) {
2027 spec
->field_width
= -spec
->field_width
;
2028 spec
->flags
|= LEFT
;
2030 spec
->type
= FORMAT_TYPE_NONE
;
2034 /* we finished early by reading the precision */
2035 if (spec
->type
== FORMAT_TYPE_PRECISION
) {
2036 if (spec
->precision
< 0)
2037 spec
->precision
= 0;
2039 spec
->type
= FORMAT_TYPE_NONE
;
2044 spec
->type
= FORMAT_TYPE_NONE
;
2046 for (; *fmt
; ++fmt
) {
2051 /* Return the current non-format string */
2052 if (fmt
!= start
|| !*fmt
)
2058 while (1) { /* this also skips first '%' */
2064 case '-': spec
->flags
|= LEFT
; break;
2065 case '+': spec
->flags
|= PLUS
; break;
2066 case ' ': spec
->flags
|= SPACE
; break;
2067 case '#': spec
->flags
|= SPECIAL
; break;
2068 case '0': spec
->flags
|= ZEROPAD
; break;
2069 default: found
= false;
2076 /* get field width */
2077 spec
->field_width
= -1;
2080 spec
->field_width
= skip_atoi(&fmt
);
2081 else if (*fmt
== '*') {
2082 /* it's the next argument */
2083 spec
->type
= FORMAT_TYPE_WIDTH
;
2084 return ++fmt
- start
;
2088 /* get the precision */
2089 spec
->precision
= -1;
2092 if (isdigit(*fmt
)) {
2093 spec
->precision
= skip_atoi(&fmt
);
2094 if (spec
->precision
< 0)
2095 spec
->precision
= 0;
2096 } else if (*fmt
== '*') {
2097 /* it's the next argument */
2098 spec
->type
= FORMAT_TYPE_PRECISION
;
2099 return ++fmt
- start
;
2104 /* get the conversion qualifier */
2106 if (*fmt
== 'h' || _tolower(*fmt
) == 'l' ||
2107 *fmt
== 'z' || *fmt
== 't') {
2109 if (unlikely(qualifier
== *fmt
)) {
2110 if (qualifier
== 'l') {
2113 } else if (qualifier
== 'h') {
2124 spec
->type
= FORMAT_TYPE_CHAR
;
2125 return ++fmt
- start
;
2128 spec
->type
= FORMAT_TYPE_STR
;
2129 return ++fmt
- start
;
2132 spec
->type
= FORMAT_TYPE_PTR
;
2133 return ++fmt
- start
;
2136 spec
->type
= FORMAT_TYPE_PERCENT_CHAR
;
2137 return ++fmt
- start
;
2139 /* integer number formats - set up the flags and "break" */
2145 spec
->flags
|= SMALL
;
2153 spec
->flags
|= SIGN
;
2159 * Since %n poses a greater security risk than
2160 * utility, treat it as any other invalid or
2161 * unsupported format specifier.
2166 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt
);
2167 spec
->type
= FORMAT_TYPE_INVALID
;
2171 if (qualifier
== 'L')
2172 spec
->type
= FORMAT_TYPE_LONG_LONG
;
2173 else if (qualifier
== 'l') {
2174 BUILD_BUG_ON(FORMAT_TYPE_ULONG
+ SIGN
!= FORMAT_TYPE_LONG
);
2175 spec
->type
= FORMAT_TYPE_ULONG
+ (spec
->flags
& SIGN
);
2176 } else if (qualifier
== 'z') {
2177 spec
->type
= FORMAT_TYPE_SIZE_T
;
2178 } else if (qualifier
== 't') {
2179 spec
->type
= FORMAT_TYPE_PTRDIFF
;
2180 } else if (qualifier
== 'H') {
2181 BUILD_BUG_ON(FORMAT_TYPE_UBYTE
+ SIGN
!= FORMAT_TYPE_BYTE
);
2182 spec
->type
= FORMAT_TYPE_UBYTE
+ (spec
->flags
& SIGN
);
2183 } else if (qualifier
== 'h') {
2184 BUILD_BUG_ON(FORMAT_TYPE_USHORT
+ SIGN
!= FORMAT_TYPE_SHORT
);
2185 spec
->type
= FORMAT_TYPE_USHORT
+ (spec
->flags
& SIGN
);
2187 BUILD_BUG_ON(FORMAT_TYPE_UINT
+ SIGN
!= FORMAT_TYPE_INT
);
2188 spec
->type
= FORMAT_TYPE_UINT
+ (spec
->flags
& SIGN
);
2191 return ++fmt
- start
;
2195 set_field_width(struct printf_spec
*spec
, int width
)
2197 spec
->field_width
= width
;
2198 if (WARN_ONCE(spec
->field_width
!= width
, "field width %d too large", width
)) {
2199 spec
->field_width
= clamp(width
, -FIELD_WIDTH_MAX
, FIELD_WIDTH_MAX
);
2204 set_precision(struct printf_spec
*spec
, int prec
)
2206 spec
->precision
= prec
;
2207 if (WARN_ONCE(spec
->precision
!= prec
, "precision %d too large", prec
)) {
2208 spec
->precision
= clamp(prec
, 0, PRECISION_MAX
);
2213 * vsnprintf - Format a string and place it in a buffer
2214 * @buf: The buffer to place the result into
2215 * @size: The size of the buffer, including the trailing null space
2216 * @fmt: The format string to use
2217 * @args: Arguments for the format string
2219 * This function generally follows C99 vsnprintf, but has some
2220 * extensions and a few limitations:
2222 * - ``%n`` is unsupported
2223 * - ``%p*`` is handled by pointer()
2225 * See pointer() or Documentation/printk-formats.txt for more
2226 * extensive description.
2228 * **Please update the documentation in both places when making changes**
2230 * The return value is the number of characters which would
2231 * be generated for the given input, excluding the trailing
2232 * '\0', as per ISO C99. If you want to have the exact
2233 * number of characters written into @buf as return value
2234 * (not including the trailing '\0'), use vscnprintf(). If the
2235 * return is greater than or equal to @size, the resulting
2236 * string is truncated.
2238 * If you're not already dealing with a va_list consider using snprintf().
2240 int vsnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
2242 unsigned long long num
;
2244 struct printf_spec spec
= {0};
2246 /* Reject out-of-range values early. Large positive sizes are
2247 used for unknown buffer sizes. */
2248 if (WARN_ON_ONCE(size
> INT_MAX
))
2254 /* Make sure end is always >= buf */
2261 const char *old_fmt
= fmt
;
2262 int read
= format_decode(fmt
, &spec
);
2266 switch (spec
.type
) {
2267 case FORMAT_TYPE_NONE
: {
2270 if (copy
> end
- str
)
2272 memcpy(str
, old_fmt
, copy
);
2278 case FORMAT_TYPE_WIDTH
:
2279 set_field_width(&spec
, va_arg(args
, int));
2282 case FORMAT_TYPE_PRECISION
:
2283 set_precision(&spec
, va_arg(args
, int));
2286 case FORMAT_TYPE_CHAR
: {
2289 if (!(spec
.flags
& LEFT
)) {
2290 while (--spec
.field_width
> 0) {
2297 c
= (unsigned char) va_arg(args
, int);
2301 while (--spec
.field_width
> 0) {
2309 case FORMAT_TYPE_STR
:
2310 str
= string(str
, end
, va_arg(args
, char *), spec
);
2313 case FORMAT_TYPE_PTR
:
2314 str
= pointer(fmt
, str
, end
, va_arg(args
, void *),
2316 while (isalnum(*fmt
))
2320 case FORMAT_TYPE_PERCENT_CHAR
:
2326 case FORMAT_TYPE_INVALID
:
2328 * Presumably the arguments passed gcc's type
2329 * checking, but there is no safe or sane way
2330 * for us to continue parsing the format and
2331 * fetching from the va_list; the remaining
2332 * specifiers and arguments would be out of
2338 switch (spec
.type
) {
2339 case FORMAT_TYPE_LONG_LONG
:
2340 num
= va_arg(args
, long long);
2342 case FORMAT_TYPE_ULONG
:
2343 num
= va_arg(args
, unsigned long);
2345 case FORMAT_TYPE_LONG
:
2346 num
= va_arg(args
, long);
2348 case FORMAT_TYPE_SIZE_T
:
2349 if (spec
.flags
& SIGN
)
2350 num
= va_arg(args
, ssize_t
);
2352 num
= va_arg(args
, size_t);
2354 case FORMAT_TYPE_PTRDIFF
:
2355 num
= va_arg(args
, ptrdiff_t);
2357 case FORMAT_TYPE_UBYTE
:
2358 num
= (unsigned char) va_arg(args
, int);
2360 case FORMAT_TYPE_BYTE
:
2361 num
= (signed char) va_arg(args
, int);
2363 case FORMAT_TYPE_USHORT
:
2364 num
= (unsigned short) va_arg(args
, int);
2366 case FORMAT_TYPE_SHORT
:
2367 num
= (short) va_arg(args
, int);
2369 case FORMAT_TYPE_INT
:
2370 num
= (int) va_arg(args
, int);
2373 num
= va_arg(args
, unsigned int);
2376 str
= number(str
, end
, num
, spec
);
2388 /* the trailing null byte doesn't count towards the total */
2392 EXPORT_SYMBOL(vsnprintf
);
2395 * vscnprintf - Format a string and place it in a buffer
2396 * @buf: The buffer to place the result into
2397 * @size: The size of the buffer, including the trailing null space
2398 * @fmt: The format string to use
2399 * @args: Arguments for the format string
2401 * The return value is the number of characters which have been written into
2402 * the @buf not including the trailing '\0'. If @size is == 0 the function
2405 * If you're not already dealing with a va_list consider using scnprintf().
2407 * See the vsnprintf() documentation for format string extensions over C99.
2409 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
2413 i
= vsnprintf(buf
, size
, fmt
, args
);
2415 if (likely(i
< size
))
2421 EXPORT_SYMBOL(vscnprintf
);
2424 * snprintf - Format a string and place it in a buffer
2425 * @buf: The buffer to place the result into
2426 * @size: The size of the buffer, including the trailing null space
2427 * @fmt: The format string to use
2428 * @...: Arguments for the format string
2430 * The return value is the number of characters which would be
2431 * generated for the given input, excluding the trailing null,
2432 * as per ISO C99. If the return is greater than or equal to
2433 * @size, the resulting string is truncated.
2435 * See the vsnprintf() documentation for format string extensions over C99.
2437 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
2442 va_start(args
, fmt
);
2443 i
= vsnprintf(buf
, size
, fmt
, args
);
2448 EXPORT_SYMBOL(snprintf
);
2451 * scnprintf - Format a string and place it in a buffer
2452 * @buf: The buffer to place the result into
2453 * @size: The size of the buffer, including the trailing null space
2454 * @fmt: The format string to use
2455 * @...: Arguments for the format string
2457 * The return value is the number of characters written into @buf not including
2458 * the trailing '\0'. If @size is == 0 the function returns 0.
2461 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
2466 va_start(args
, fmt
);
2467 i
= vscnprintf(buf
, size
, fmt
, args
);
2472 EXPORT_SYMBOL(scnprintf
);
2475 * vsprintf - Format a string and place it in a buffer
2476 * @buf: The buffer to place the result into
2477 * @fmt: The format string to use
2478 * @args: Arguments for the format string
2480 * The function returns the number of characters written
2481 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
2484 * If you're not already dealing with a va_list consider using sprintf().
2486 * See the vsnprintf() documentation for format string extensions over C99.
2488 int vsprintf(char *buf
, const char *fmt
, va_list args
)
2490 return vsnprintf(buf
, INT_MAX
, fmt
, args
);
2492 EXPORT_SYMBOL(vsprintf
);
2495 * sprintf - Format a string and place it in a buffer
2496 * @buf: The buffer to place the result into
2497 * @fmt: The format string to use
2498 * @...: Arguments for the format string
2500 * The function returns the number of characters written
2501 * into @buf. Use snprintf() or scnprintf() in order to avoid
2504 * See the vsnprintf() documentation for format string extensions over C99.
2506 int sprintf(char *buf
, const char *fmt
, ...)
2511 va_start(args
, fmt
);
2512 i
= vsnprintf(buf
, INT_MAX
, fmt
, args
);
2517 EXPORT_SYMBOL(sprintf
);
2519 #ifdef CONFIG_BINARY_PRINTF
2522 * vbin_printf() - VA arguments to binary data
2523 * bstr_printf() - Binary data to text string
2527 * vbin_printf - Parse a format string and place args' binary value in a buffer
2528 * @bin_buf: The buffer to place args' binary value
2529 * @size: The size of the buffer(by words(32bits), not characters)
2530 * @fmt: The format string to use
2531 * @args: Arguments for the format string
2533 * The format follows C99 vsnprintf, except %n is ignored, and its argument
2536 * The return value is the number of words(32bits) which would be generated for
2540 * If the return value is greater than @size, the resulting bin_buf is NOT
2541 * valid for bstr_printf().
2543 int vbin_printf(u32
*bin_buf
, size_t size
, const char *fmt
, va_list args
)
2545 struct printf_spec spec
= {0};
2548 str
= (char *)bin_buf
;
2549 end
= (char *)(bin_buf
+ size
);
2551 #define save_arg(type) \
2553 if (sizeof(type) == 8) { \
2554 unsigned long long value; \
2555 str = PTR_ALIGN(str, sizeof(u32)); \
2556 value = va_arg(args, unsigned long long); \
2557 if (str + sizeof(type) <= end) { \
2558 *(u32 *)str = *(u32 *)&value; \
2559 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
2562 unsigned long value; \
2563 str = PTR_ALIGN(str, sizeof(type)); \
2564 value = va_arg(args, int); \
2565 if (str + sizeof(type) <= end) \
2566 *(typeof(type) *)str = (type)value; \
2568 str += sizeof(type); \
2572 int read
= format_decode(fmt
, &spec
);
2576 switch (spec
.type
) {
2577 case FORMAT_TYPE_NONE
:
2578 case FORMAT_TYPE_PERCENT_CHAR
:
2580 case FORMAT_TYPE_INVALID
:
2583 case FORMAT_TYPE_WIDTH
:
2584 case FORMAT_TYPE_PRECISION
:
2588 case FORMAT_TYPE_CHAR
:
2592 case FORMAT_TYPE_STR
: {
2593 const char *save_str
= va_arg(args
, char *);
2596 if ((unsigned long)save_str
> (unsigned long)-PAGE_SIZE
2597 || (unsigned long)save_str
< PAGE_SIZE
)
2598 save_str
= "(null)";
2599 len
= strlen(save_str
) + 1;
2600 if (str
+ len
< end
)
2601 memcpy(str
, save_str
, len
);
2606 case FORMAT_TYPE_PTR
:
2608 /* skip all alphanumeric pointer suffixes */
2609 while (isalnum(*fmt
))
2614 switch (spec
.type
) {
2616 case FORMAT_TYPE_LONG_LONG
:
2617 save_arg(long long);
2619 case FORMAT_TYPE_ULONG
:
2620 case FORMAT_TYPE_LONG
:
2621 save_arg(unsigned long);
2623 case FORMAT_TYPE_SIZE_T
:
2626 case FORMAT_TYPE_PTRDIFF
:
2627 save_arg(ptrdiff_t);
2629 case FORMAT_TYPE_UBYTE
:
2630 case FORMAT_TYPE_BYTE
:
2633 case FORMAT_TYPE_USHORT
:
2634 case FORMAT_TYPE_SHORT
:
2644 return (u32
*)(PTR_ALIGN(str
, sizeof(u32
))) - bin_buf
;
2647 EXPORT_SYMBOL_GPL(vbin_printf
);
2650 * bstr_printf - Format a string from binary arguments and place it in a buffer
2651 * @buf: The buffer to place the result into
2652 * @size: The size of the buffer, including the trailing null space
2653 * @fmt: The format string to use
2654 * @bin_buf: Binary arguments for the format string
2656 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
2657 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
2658 * a binary buffer that generated by vbin_printf.
2660 * The format follows C99 vsnprintf, but has some extensions:
2661 * see vsnprintf comment for details.
2663 * The return value is the number of characters which would
2664 * be generated for the given input, excluding the trailing
2665 * '\0', as per ISO C99. If you want to have the exact
2666 * number of characters written into @buf as return value
2667 * (not including the trailing '\0'), use vscnprintf(). If the
2668 * return is greater than or equal to @size, the resulting
2669 * string is truncated.
2671 int bstr_printf(char *buf
, size_t size
, const char *fmt
, const u32
*bin_buf
)
2673 struct printf_spec spec
= {0};
2675 const char *args
= (const char *)bin_buf
;
2677 if (WARN_ON_ONCE(size
> INT_MAX
))
2683 #define get_arg(type) \
2685 typeof(type) value; \
2686 if (sizeof(type) == 8) { \
2687 args = PTR_ALIGN(args, sizeof(u32)); \
2688 *(u32 *)&value = *(u32 *)args; \
2689 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
2691 args = PTR_ALIGN(args, sizeof(type)); \
2692 value = *(typeof(type) *)args; \
2694 args += sizeof(type); \
2698 /* Make sure end is always >= buf */
2705 const char *old_fmt
= fmt
;
2706 int read
= format_decode(fmt
, &spec
);
2710 switch (spec
.type
) {
2711 case FORMAT_TYPE_NONE
: {
2714 if (copy
> end
- str
)
2716 memcpy(str
, old_fmt
, copy
);
2722 case FORMAT_TYPE_WIDTH
:
2723 set_field_width(&spec
, get_arg(int));
2726 case FORMAT_TYPE_PRECISION
:
2727 set_precision(&spec
, get_arg(int));
2730 case FORMAT_TYPE_CHAR
: {
2733 if (!(spec
.flags
& LEFT
)) {
2734 while (--spec
.field_width
> 0) {
2740 c
= (unsigned char) get_arg(char);
2744 while (--spec
.field_width
> 0) {
2752 case FORMAT_TYPE_STR
: {
2753 const char *str_arg
= args
;
2754 args
+= strlen(str_arg
) + 1;
2755 str
= string(str
, end
, (char *)str_arg
, spec
);
2759 case FORMAT_TYPE_PTR
:
2760 str
= pointer(fmt
, str
, end
, get_arg(void *), spec
);
2761 while (isalnum(*fmt
))
2765 case FORMAT_TYPE_PERCENT_CHAR
:
2771 case FORMAT_TYPE_INVALID
:
2775 unsigned long long num
;
2777 switch (spec
.type
) {
2779 case FORMAT_TYPE_LONG_LONG
:
2780 num
= get_arg(long long);
2782 case FORMAT_TYPE_ULONG
:
2783 case FORMAT_TYPE_LONG
:
2784 num
= get_arg(unsigned long);
2786 case FORMAT_TYPE_SIZE_T
:
2787 num
= get_arg(size_t);
2789 case FORMAT_TYPE_PTRDIFF
:
2790 num
= get_arg(ptrdiff_t);
2792 case FORMAT_TYPE_UBYTE
:
2793 num
= get_arg(unsigned char);
2795 case FORMAT_TYPE_BYTE
:
2796 num
= get_arg(signed char);
2798 case FORMAT_TYPE_USHORT
:
2799 num
= get_arg(unsigned short);
2801 case FORMAT_TYPE_SHORT
:
2802 num
= get_arg(short);
2804 case FORMAT_TYPE_UINT
:
2805 num
= get_arg(unsigned int);
2811 str
= number(str
, end
, num
, spec
);
2813 } /* switch(spec.type) */
2826 /* the trailing null byte doesn't count towards the total */
2829 EXPORT_SYMBOL_GPL(bstr_printf
);
2832 * bprintf - Parse a format string and place args' binary value in a buffer
2833 * @bin_buf: The buffer to place args' binary value
2834 * @size: The size of the buffer(by words(32bits), not characters)
2835 * @fmt: The format string to use
2836 * @...: Arguments for the format string
2838 * The function returns the number of words(u32) written
2841 int bprintf(u32
*bin_buf
, size_t size
, const char *fmt
, ...)
2846 va_start(args
, fmt
);
2847 ret
= vbin_printf(bin_buf
, size
, fmt
, args
);
2852 EXPORT_SYMBOL_GPL(bprintf
);
2854 #endif /* CONFIG_BINARY_PRINTF */
2857 * vsscanf - Unformat a buffer into a list of arguments
2858 * @buf: input buffer
2859 * @fmt: format of buffer
2862 int vsscanf(const char *buf
, const char *fmt
, va_list args
)
2864 const char *str
= buf
;
2872 unsigned long long u
;
2878 /* skip any white space in format */
2879 /* white space in format matchs any amount of
2880 * white space, including none, in the input.
2882 if (isspace(*fmt
)) {
2883 fmt
= skip_spaces(++fmt
);
2884 str
= skip_spaces(str
);
2887 /* anything that is not a conversion must match exactly */
2888 if (*fmt
!= '%' && *fmt
) {
2889 if (*fmt
++ != *str
++)
2898 /* skip this conversion.
2899 * advance both strings to next white space
2904 while (!isspace(*fmt
) && *fmt
!= '%' && *fmt
) {
2905 /* '%*[' not yet supported, invalid format */
2910 while (!isspace(*str
) && *str
)
2915 /* get field width */
2917 if (isdigit(*fmt
)) {
2918 field_width
= skip_atoi(&fmt
);
2919 if (field_width
<= 0)
2923 /* get conversion qualifier */
2925 if (*fmt
== 'h' || _tolower(*fmt
) == 'l' ||
2928 if (unlikely(qualifier
== *fmt
)) {
2929 if (qualifier
== 'h') {
2932 } else if (qualifier
== 'l') {
2943 /* return number of characters read so far */
2944 *va_arg(args
, int *) = str
- buf
;
2958 char *s
= (char *)va_arg(args
, char*);
2959 if (field_width
== -1)
2963 } while (--field_width
> 0 && *str
);
2969 char *s
= (char *)va_arg(args
, char *);
2970 if (field_width
== -1)
2971 field_width
= SHRT_MAX
;
2972 /* first, skip leading white space in buffer */
2973 str
= skip_spaces(str
);
2975 /* now copy until next white space */
2976 while (*str
&& !isspace(*str
) && field_width
--)
2983 * Warning: This implementation of the '[' conversion specifier
2984 * deviates from its glibc counterpart in the following ways:
2985 * (1) It does NOT support ranges i.e. '-' is NOT a special
2987 * (2) It cannot match the closing bracket ']' itself
2988 * (3) A field width is required
2989 * (4) '%*[' (discard matching input) is currently not supported
2992 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
2993 * buf1, buf2, buf3);
2999 char *s
= (char *)va_arg(args
, char *);
3000 DECLARE_BITMAP(set
, 256) = {0};
3001 unsigned int len
= 0;
3002 bool negate
= (*fmt
== '^');
3004 /* field width is required */
3005 if (field_width
== -1)
3011 for ( ; *fmt
&& *fmt
!= ']'; ++fmt
, ++len
)
3012 set_bit((u8
)*fmt
, set
);
3014 /* no ']' or no character set found */
3020 bitmap_complement(set
, set
, 256);
3021 /* exclude null '\0' byte */
3025 /* match must be non-empty */
3026 if (!test_bit((u8
)*str
, set
))
3029 while (test_bit((u8
)*str
, set
) && field_width
--)
3049 /* looking for '%' in str */
3054 /* invalid format; stop here */
3058 /* have some sort of integer conversion.
3059 * first, skip white space in buffer.
3061 str
= skip_spaces(str
);
3064 if (is_sign
&& digit
== '-')
3068 || (base
== 16 && !isxdigit(digit
))
3069 || (base
== 10 && !isdigit(digit
))
3070 || (base
== 8 && (!isdigit(digit
) || digit
> '7'))
3071 || (base
== 0 && !isdigit(digit
)))
3075 val
.s
= qualifier
!= 'L' ?
3076 simple_strtol(str
, &next
, base
) :
3077 simple_strtoll(str
, &next
, base
);
3079 val
.u
= qualifier
!= 'L' ?
3080 simple_strtoul(str
, &next
, base
) :
3081 simple_strtoull(str
, &next
, base
);
3083 if (field_width
> 0 && next
- str
> field_width
) {
3085 _parse_integer_fixup_radix(str
, &base
);
3086 while (next
- str
> field_width
) {
3088 val
.s
= div_s64(val
.s
, base
);
3090 val
.u
= div_u64(val
.u
, base
);
3095 switch (qualifier
) {
3096 case 'H': /* that's 'hh' in format */
3098 *va_arg(args
, signed char *) = val
.s
;
3100 *va_arg(args
, unsigned char *) = val
.u
;
3104 *va_arg(args
, short *) = val
.s
;
3106 *va_arg(args
, unsigned short *) = val
.u
;
3110 *va_arg(args
, long *) = val
.s
;
3112 *va_arg(args
, unsigned long *) = val
.u
;
3116 *va_arg(args
, long long *) = val
.s
;
3118 *va_arg(args
, unsigned long long *) = val
.u
;
3121 *va_arg(args
, size_t *) = val
.u
;
3125 *va_arg(args
, int *) = val
.s
;
3127 *va_arg(args
, unsigned int *) = val
.u
;
3139 EXPORT_SYMBOL(vsscanf
);
3142 * sscanf - Unformat a buffer into a list of arguments
3143 * @buf: input buffer
3144 * @fmt: formatting of buffer
3145 * @...: resulting arguments
3147 int sscanf(const char *buf
, const char *fmt
, ...)
3152 va_start(args
, fmt
);
3153 i
= vsscanf(buf
, fmt
, args
);
3158 EXPORT_SYMBOL(sscanf
);