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/byteorder.h> /* cpu_to_le16 */
47 #include <linux/string_helpers.h>
51 * simple_strtoull - convert a string to an unsigned long long
52 * @cp: The start of the string
53 * @endp: A pointer to the end of the parsed string will be placed here
54 * @base: The number base to use
56 * This function is obsolete. Please use kstrtoull instead.
58 unsigned long long simple_strtoull(const char *cp
, char **endp
, unsigned int base
)
60 unsigned long long result
;
63 cp
= _parse_integer_fixup_radix(cp
, &base
);
64 rv
= _parse_integer(cp
, base
, &result
);
66 cp
+= (rv
& ~KSTRTOX_OVERFLOW
);
73 EXPORT_SYMBOL(simple_strtoull
);
76 * simple_strtoul - convert a string to an unsigned long
77 * @cp: The start of the string
78 * @endp: A pointer to the end of the parsed string will be placed here
79 * @base: The number base to use
81 * This function is obsolete. Please use kstrtoul instead.
83 unsigned long simple_strtoul(const char *cp
, char **endp
, unsigned int base
)
85 return simple_strtoull(cp
, endp
, base
);
87 EXPORT_SYMBOL(simple_strtoul
);
90 * simple_strtol - convert a string to a signed long
91 * @cp: The start of the string
92 * @endp: A pointer to the end of the parsed string will be placed here
93 * @base: The number base to use
95 * This function is obsolete. Please use kstrtol instead.
97 long simple_strtol(const char *cp
, char **endp
, unsigned int base
)
100 return -simple_strtoul(cp
+ 1, endp
, base
);
102 return simple_strtoul(cp
, endp
, base
);
104 EXPORT_SYMBOL(simple_strtol
);
107 * simple_strtoll - convert a string to a signed long long
108 * @cp: The start of the string
109 * @endp: A pointer to the end of the parsed string will be placed here
110 * @base: The number base to use
112 * This function is obsolete. Please use kstrtoll instead.
114 long long simple_strtoll(const char *cp
, char **endp
, unsigned int base
)
117 return -simple_strtoull(cp
+ 1, endp
, base
);
119 return simple_strtoull(cp
, endp
, base
);
121 EXPORT_SYMBOL(simple_strtoll
);
123 static noinline_for_stack
124 int skip_atoi(const char **s
)
129 i
= i
*10 + *((*s
)++) - '0';
130 } while (isdigit(**s
));
136 * Decimal conversion is by far the most typical, and is used for
137 * /proc and /sys data. This directly impacts e.g. top performance
138 * with many processes running. We optimize it for speed by emitting
139 * two characters at a time, using a 200 byte lookup table. This
140 * roughly halves the number of multiplications compared to computing
141 * the digits one at a time. Implementation strongly inspired by the
142 * previous version, which in turn used ideas described at
143 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
144 * from the author, Douglas W. Jones).
146 * It turns out there is precisely one 26 bit fixed-point
147 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
148 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
149 * range happens to be somewhat larger (x <= 1073741898), but that's
150 * irrelevant for our purpose.
152 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
153 * need a 32x32->64 bit multiply, so we simply use the same constant.
155 * For dividing a number in the range [100, 10^4-1] by 100, there are
156 * several options. The simplest is (x * 0x147b) >> 19, which is valid
157 * for all x <= 43698.
160 static const u16 decpair
[100] = {
161 #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
162 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
163 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
164 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
165 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
166 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
167 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
168 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
169 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
170 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
171 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
176 * This will print a single '0' even if r == 0, since we would
177 * immediately jump to out_r where two 0s would be written but only
178 * one of them accounted for in buf. This is needed by ip4_string
179 * below. All other callers pass a non-zero value of r.
181 static noinline_for_stack
182 char *put_dec_trunc8(char *buf
, unsigned r
)
190 /* 100 <= r < 10^8 */
191 q
= (r
* (u64
)0x28f5c29) >> 32;
192 *((u16
*)buf
) = decpair
[r
- 100*q
];
199 /* 100 <= q < 10^6 */
200 r
= (q
* (u64
)0x28f5c29) >> 32;
201 *((u16
*)buf
) = decpair
[q
- 100*r
];
208 /* 100 <= r < 10^4 */
209 q
= (r
* 0x147b) >> 19;
210 *((u16
*)buf
) = decpair
[r
- 100*q
];
217 *((u16
*)buf
) = decpair
[r
];
218 buf
+= r
< 10 ? 1 : 2;
222 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
223 static noinline_for_stack
224 char *put_dec_full8(char *buf
, unsigned r
)
229 q
= (r
* (u64
)0x28f5c29) >> 32;
230 *((u16
*)buf
) = decpair
[r
- 100*q
];
234 r
= (q
* (u64
)0x28f5c29) >> 32;
235 *((u16
*)buf
) = decpair
[q
- 100*r
];
239 q
= (r
* 0x147b) >> 19;
240 *((u16
*)buf
) = decpair
[r
- 100*q
];
244 *((u16
*)buf
) = decpair
[q
];
249 static noinline_for_stack
250 char *put_dec(char *buf
, unsigned long long n
)
252 if (n
>= 100*1000*1000)
253 buf
= put_dec_full8(buf
, do_div(n
, 100*1000*1000));
254 /* 1 <= n <= 1.6e11 */
255 if (n
>= 100*1000*1000)
256 buf
= put_dec_full8(buf
, do_div(n
, 100*1000*1000));
258 return put_dec_trunc8(buf
, n
);
261 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
264 put_dec_full4(char *buf
, unsigned r
)
269 q
= (r
* 0x147b) >> 19;
270 *((u16
*)buf
) = decpair
[r
- 100*q
];
273 *((u16
*)buf
) = decpair
[q
];
277 * Call put_dec_full4 on x % 10000, return x / 10000.
278 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
279 * holds for all x < 1,128,869,999. The largest value this
280 * helper will ever be asked to convert is 1,125,520,955.
281 * (second call in the put_dec code, assuming n is all-ones).
283 static noinline_for_stack
284 unsigned put_dec_helper4(char *buf
, unsigned x
)
286 uint32_t q
= (x
* (uint64_t)0x346DC5D7) >> 43;
288 put_dec_full4(buf
, x
- q
* 10000);
292 /* Based on code by Douglas W. Jones found at
293 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
294 * (with permission from the author).
295 * Performs no 64-bit division and hence should be fast on 32-bit machines.
298 char *put_dec(char *buf
, unsigned long long n
)
300 uint32_t d3
, d2
, d1
, q
, h
;
302 if (n
< 100*1000*1000)
303 return put_dec_trunc8(buf
, n
);
305 d1
= ((uint32_t)n
>> 16); /* implicit "& 0xffff" */
308 d3
= (h
>> 16); /* implicit "& 0xffff" */
310 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
311 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
312 q
= 656 * d3
+ 7296 * d2
+ 5536 * d1
+ ((uint32_t)n
& 0xffff);
313 q
= put_dec_helper4(buf
, q
);
315 q
+= 7671 * d3
+ 9496 * d2
+ 6 * d1
;
316 q
= put_dec_helper4(buf
+4, q
);
318 q
+= 4749 * d3
+ 42 * d2
;
319 q
= put_dec_helper4(buf
+8, q
);
324 buf
= put_dec_trunc8(buf
, q
);
325 else while (buf
[-1] == '0')
334 * Convert passed number to decimal string.
335 * Returns the length of string. On buffer overflow, returns 0.
337 * If speed is not important, use snprintf(). It's easy to read the code.
339 int num_to_str(char *buf
, int size
, unsigned long long num
, unsigned int width
)
341 /* put_dec requires 2-byte alignment of the buffer. */
342 char tmp
[sizeof(num
) * 3] __aligned(2);
345 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
350 len
= put_dec(tmp
, num
) - tmp
;
353 if (len
> size
|| width
> size
)
358 for (idx
= 0; idx
< width
; idx
++)
364 for (idx
= 0; idx
< len
; ++idx
)
365 buf
[idx
+ width
] = tmp
[len
- idx
- 1];
370 #define SIGN 1 /* unsigned/signed, must be 1 */
371 #define LEFT 2 /* left justified */
372 #define PLUS 4 /* show plus */
373 #define SPACE 8 /* space if plus */
374 #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
375 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
376 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
379 FORMAT_TYPE_NONE
, /* Just a string part */
381 FORMAT_TYPE_PRECISION
,
385 FORMAT_TYPE_PERCENT_CHAR
,
387 FORMAT_TYPE_LONG_LONG
,
401 unsigned int type
:8; /* format_type enum */
402 signed int field_width
:24; /* width of output field */
403 unsigned int flags
:8; /* flags to number() */
404 unsigned int base
:8; /* number base, 8, 10 or 16 only */
405 signed int precision
:16; /* # of digits/chars */
407 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
408 #define PRECISION_MAX ((1 << 15) - 1)
410 static noinline_for_stack
411 char *number(char *buf
, char *end
, unsigned long long num
,
412 struct printf_spec spec
)
414 /* put_dec requires 2-byte alignment of the buffer. */
415 char tmp
[3 * sizeof(num
)] __aligned(2);
418 int need_pfx
= ((spec
.flags
& SPECIAL
) && spec
.base
!= 10);
420 bool is_zero
= num
== 0LL;
421 int field_width
= spec
.field_width
;
422 int precision
= spec
.precision
;
424 BUILD_BUG_ON(sizeof(struct printf_spec
) != 8);
426 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
427 * produces same digits or (maybe lowercased) letters */
428 locase
= (spec
.flags
& SMALL
);
429 if (spec
.flags
& LEFT
)
430 spec
.flags
&= ~ZEROPAD
;
432 if (spec
.flags
& SIGN
) {
433 if ((signed long long)num
< 0) {
435 num
= -(signed long long)num
;
437 } else if (spec
.flags
& PLUS
) {
440 } else if (spec
.flags
& SPACE
) {
452 /* generate full string in tmp[], in reverse order */
455 tmp
[i
++] = hex_asc_upper
[num
] | locase
;
456 else if (spec
.base
!= 10) { /* 8 or 16 */
457 int mask
= spec
.base
- 1;
463 tmp
[i
++] = (hex_asc_upper
[((unsigned char)num
) & mask
] | locase
);
466 } else { /* base 10 */
467 i
= put_dec(tmp
, num
) - tmp
;
470 /* printing 100 using %2d gives "100", not "00" */
473 /* leading space padding */
474 field_width
-= precision
;
475 if (!(spec
.flags
& (ZEROPAD
| LEFT
))) {
476 while (--field_width
>= 0) {
488 /* "0x" / "0" prefix */
490 if (spec
.base
== 16 || !is_zero
) {
495 if (spec
.base
== 16) {
497 *buf
= ('X' | locase
);
501 /* zero or space padding */
502 if (!(spec
.flags
& LEFT
)) {
503 char c
= ' ' + (spec
.flags
& ZEROPAD
);
504 BUILD_BUG_ON(' ' + ZEROPAD
!= '0');
505 while (--field_width
>= 0) {
511 /* hmm even more zero padding? */
512 while (i
<= --precision
) {
517 /* actual digits of result */
523 /* trailing space padding */
524 while (--field_width
>= 0) {
533 static noinline_for_stack
534 char *special_hex_number(char *buf
, char *end
, unsigned long long num
, int size
)
536 struct printf_spec spec
;
538 spec
.type
= FORMAT_TYPE_PTR
;
539 spec
.field_width
= 2 + 2 * size
; /* 0x + hex */
540 spec
.flags
= SPECIAL
| SMALL
| ZEROPAD
;
544 return number(buf
, end
, num
, spec
);
547 static void move_right(char *buf
, char *end
, unsigned len
, unsigned spaces
)
550 if (buf
>= end
) /* nowhere to put anything */
553 if (size
<= spaces
) {
554 memset(buf
, ' ', size
);
558 if (len
> size
- spaces
)
560 memmove(buf
+ spaces
, buf
, len
);
562 memset(buf
, ' ', spaces
);
566 * Handle field width padding for a string.
567 * @buf: current buffer position
568 * @n: length of string
569 * @end: end of output buffer
570 * @spec: for field width and flags
571 * Returns: new buffer position after padding.
573 static noinline_for_stack
574 char *widen_string(char *buf
, int n
, char *end
, struct printf_spec spec
)
578 if (likely(n
>= spec
.field_width
))
580 /* we want to pad the sucker */
581 spaces
= spec
.field_width
- n
;
582 if (!(spec
.flags
& LEFT
)) {
583 move_right(buf
- n
, end
, n
, spaces
);
594 static noinline_for_stack
595 char *string(char *buf
, char *end
, const char *s
, struct printf_spec spec
)
598 size_t lim
= spec
.precision
;
600 if ((unsigned long)s
< PAGE_SIZE
)
612 return widen_string(buf
, len
, end
, spec
);
615 static noinline_for_stack
616 char *pointer_string(char *buf
, char *end
, const void *ptr
,
617 struct printf_spec spec
)
621 if (spec
.field_width
== -1) {
622 spec
.field_width
= 2 * sizeof(ptr
);
623 spec
.flags
|= ZEROPAD
;
626 return number(buf
, end
, (unsigned long int)ptr
, spec
);
629 /* Make pointers available for printing early in the boot sequence. */
630 static int debug_boot_weak_hash __ro_after_init
;
632 static int __init
debug_boot_weak_hash_enable(char *str
)
634 debug_boot_weak_hash
= 1;
635 pr_info("debug_boot_weak_hash enabled\n");
638 early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable
);
640 static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key
);
641 static siphash_key_t ptr_key __read_mostly
;
643 static void enable_ptr_key_workfn(struct work_struct
*work
)
645 get_random_bytes(&ptr_key
, sizeof(ptr_key
));
646 /* Needs to run from preemptible context */
647 static_branch_disable(¬_filled_random_ptr_key
);
650 static DECLARE_WORK(enable_ptr_key_work
, enable_ptr_key_workfn
);
652 static void fill_random_ptr_key(struct random_ready_callback
*unused
)
654 /* This may be in an interrupt handler. */
655 queue_work(system_unbound_wq
, &enable_ptr_key_work
);
658 static struct random_ready_callback random_ready
= {
659 .func
= fill_random_ptr_key
662 static int __init
initialize_ptr_random(void)
664 int key_size
= sizeof(ptr_key
);
667 /* Use hw RNG if available. */
668 if (get_random_bytes_arch(&ptr_key
, key_size
) == key_size
) {
669 static_branch_disable(¬_filled_random_ptr_key
);
673 ret
= add_random_ready_callback(&random_ready
);
676 } else if (ret
== -EALREADY
) {
677 /* This is in preemptible context */
678 enable_ptr_key_workfn(&enable_ptr_key_work
);
684 early_initcall(initialize_ptr_random
);
686 /* Maps a pointer to a 32 bit unique identifier. */
687 static char *ptr_to_id(char *buf
, char *end
, const void *ptr
,
688 struct printf_spec spec
)
690 const char *str
= sizeof(ptr
) == 8 ? "(____ptrval____)" : "(ptrval)";
691 unsigned long hashval
;
693 /* When debugging early boot use non-cryptographically secure hash. */
694 if (unlikely(debug_boot_weak_hash
)) {
695 hashval
= hash_long((unsigned long)ptr
, 32);
696 return pointer_string(buf
, end
, (const void *)hashval
, spec
);
699 if (static_branch_unlikely(¬_filled_random_ptr_key
)) {
700 spec
.field_width
= 2 * sizeof(ptr
);
701 /* string length must be less than default_width */
702 return string(buf
, end
, str
, spec
);
706 hashval
= (unsigned long)siphash_1u64((u64
)ptr
, &ptr_key
);
708 * Mask off the first 32 bits, this makes explicit that we have
709 * modified the address (and 32 bits is plenty for a unique ID).
711 hashval
= hashval
& 0xffffffff;
713 hashval
= (unsigned long)siphash_1u32((u32
)ptr
, &ptr_key
);
715 return pointer_string(buf
, end
, (const void *)hashval
, spec
);
718 static noinline_for_stack
719 char *dentry_name(char *buf
, char *end
, const struct dentry
*d
, struct printf_spec spec
,
722 const char *array
[4], *s
;
723 const struct dentry
*p
;
728 case '2': case '3': case '4':
729 depth
= fmt
[1] - '0';
736 for (i
= 0; i
< depth
; i
++, d
= p
) {
737 p
= READ_ONCE(d
->d_parent
);
738 array
[i
] = READ_ONCE(d
->d_name
.name
);
747 for (n
= 0; n
!= spec
.precision
; n
++, buf
++) {
759 return widen_string(buf
, n
, end
, spec
);
763 static noinline_for_stack
764 char *bdev_name(char *buf
, char *end
, struct block_device
*bdev
,
765 struct printf_spec spec
, const char *fmt
)
767 struct gendisk
*hd
= bdev
->bd_disk
;
769 buf
= string(buf
, end
, hd
->disk_name
, spec
);
770 if (bdev
->bd_part
->partno
) {
771 if (isdigit(hd
->disk_name
[strlen(hd
->disk_name
)-1])) {
776 buf
= number(buf
, end
, bdev
->bd_part
->partno
, spec
);
782 static noinline_for_stack
783 char *symbol_string(char *buf
, char *end
, void *ptr
,
784 struct printf_spec spec
, const char *fmt
)
787 #ifdef CONFIG_KALLSYMS
788 char sym
[KSYM_SYMBOL_LEN
];
792 ptr
= __builtin_extract_return_addr(ptr
);
793 value
= (unsigned long)ptr
;
795 #ifdef CONFIG_KALLSYMS
797 sprint_backtrace(sym
, value
);
798 else if (*fmt
!= 'f' && *fmt
!= 's')
799 sprint_symbol(sym
, value
);
801 sprint_symbol_no_offset(sym
, value
);
803 return string(buf
, end
, sym
, spec
);
805 return special_hex_number(buf
, end
, value
, sizeof(void *));
809 static const struct printf_spec default_str_spec
= {
814 static const struct printf_spec default_flag_spec
= {
817 .flags
= SPECIAL
| SMALL
,
820 static const struct printf_spec default_dec_spec
= {
825 static noinline_for_stack
826 char *resource_string(char *buf
, char *end
, struct resource
*res
,
827 struct printf_spec spec
, const char *fmt
)
829 #ifndef IO_RSRC_PRINTK_SIZE
830 #define IO_RSRC_PRINTK_SIZE 6
833 #ifndef MEM_RSRC_PRINTK_SIZE
834 #define MEM_RSRC_PRINTK_SIZE 10
836 static const struct printf_spec io_spec
= {
838 .field_width
= IO_RSRC_PRINTK_SIZE
,
840 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
842 static const struct printf_spec mem_spec
= {
844 .field_width
= MEM_RSRC_PRINTK_SIZE
,
846 .flags
= SPECIAL
| SMALL
| ZEROPAD
,
848 static const struct printf_spec bus_spec
= {
852 .flags
= SMALL
| ZEROPAD
,
854 static const struct printf_spec str_spec
= {
860 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
861 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
862 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
863 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
864 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
865 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
866 char sym
[max(2*RSRC_BUF_SIZE
+ DECODED_BUF_SIZE
,
867 2*RSRC_BUF_SIZE
+ FLAG_BUF_SIZE
+ RAW_BUF_SIZE
)];
869 char *p
= sym
, *pend
= sym
+ sizeof(sym
);
870 int decode
= (fmt
[0] == 'R') ? 1 : 0;
871 const struct printf_spec
*specp
;
874 if (res
->flags
& IORESOURCE_IO
) {
875 p
= string(p
, pend
, "io ", str_spec
);
877 } else if (res
->flags
& IORESOURCE_MEM
) {
878 p
= string(p
, pend
, "mem ", str_spec
);
880 } else if (res
->flags
& IORESOURCE_IRQ
) {
881 p
= string(p
, pend
, "irq ", str_spec
);
882 specp
= &default_dec_spec
;
883 } else if (res
->flags
& IORESOURCE_DMA
) {
884 p
= string(p
, pend
, "dma ", str_spec
);
885 specp
= &default_dec_spec
;
886 } else if (res
->flags
& IORESOURCE_BUS
) {
887 p
= string(p
, pend
, "bus ", str_spec
);
890 p
= string(p
, pend
, "??? ", str_spec
);
894 if (decode
&& res
->flags
& IORESOURCE_UNSET
) {
895 p
= string(p
, pend
, "size ", str_spec
);
896 p
= number(p
, pend
, resource_size(res
), *specp
);
898 p
= number(p
, pend
, res
->start
, *specp
);
899 if (res
->start
!= res
->end
) {
901 p
= number(p
, pend
, res
->end
, *specp
);
905 if (res
->flags
& IORESOURCE_MEM_64
)
906 p
= string(p
, pend
, " 64bit", str_spec
);
907 if (res
->flags
& IORESOURCE_PREFETCH
)
908 p
= string(p
, pend
, " pref", str_spec
);
909 if (res
->flags
& IORESOURCE_WINDOW
)
910 p
= string(p
, pend
, " window", str_spec
);
911 if (res
->flags
& IORESOURCE_DISABLED
)
912 p
= string(p
, pend
, " disabled", str_spec
);
914 p
= string(p
, pend
, " flags ", str_spec
);
915 p
= number(p
, pend
, res
->flags
, default_flag_spec
);
920 return string(buf
, end
, sym
, spec
);
923 static noinline_for_stack
924 char *hex_string(char *buf
, char *end
, u8
*addr
, struct printf_spec spec
,
927 int i
, len
= 1; /* if we pass '%ph[CDN]', field width remains
928 negative value, fallback to the default */
931 if (spec
.field_width
== 0)
932 /* nothing to print */
935 if (ZERO_OR_NULL_PTR(addr
))
937 return string(buf
, end
, NULL
, spec
);
954 if (spec
.field_width
> 0)
955 len
= min_t(int, spec
.field_width
, 64);
957 for (i
= 0; i
< len
; ++i
) {
959 *buf
= hex_asc_hi(addr
[i
]);
962 *buf
= hex_asc_lo(addr
[i
]);
965 if (separator
&& i
!= len
- 1) {
975 static noinline_for_stack
976 char *bitmap_string(char *buf
, char *end
, unsigned long *bitmap
,
977 struct printf_spec spec
, const char *fmt
)
979 const int CHUNKSZ
= 32;
980 int nr_bits
= max_t(int, spec
.field_width
, 0);
984 /* reused to print numbers */
985 spec
= (struct printf_spec
){ .flags
= SMALL
| ZEROPAD
, .base
= 16 };
987 chunksz
= nr_bits
& (CHUNKSZ
- 1);
991 i
= ALIGN(nr_bits
, CHUNKSZ
) - CHUNKSZ
;
992 for (; i
>= 0; i
-= CHUNKSZ
) {
996 chunkmask
= ((1ULL << chunksz
) - 1);
997 word
= i
/ BITS_PER_LONG
;
998 bit
= i
% BITS_PER_LONG
;
999 val
= (bitmap
[word
] >> bit
) & chunkmask
;
1008 spec
.field_width
= DIV_ROUND_UP(chunksz
, 4);
1009 buf
= number(buf
, end
, val
, spec
);
1016 static noinline_for_stack
1017 char *bitmap_list_string(char *buf
, char *end
, unsigned long *bitmap
,
1018 struct printf_spec spec
, const char *fmt
)
1020 int nr_bits
= max_t(int, spec
.field_width
, 0);
1021 /* current bit is 'cur', most recently seen range is [rbot, rtop] */
1022 int cur
, rbot
, rtop
;
1025 rbot
= cur
= find_first_bit(bitmap
, nr_bits
);
1026 while (cur
< nr_bits
) {
1028 cur
= find_next_bit(bitmap
, nr_bits
, cur
+ 1);
1029 if (cur
< nr_bits
&& cur
<= rtop
+ 1)
1039 buf
= number(buf
, end
, rbot
, default_dec_spec
);
1045 buf
= number(buf
, end
, rtop
, default_dec_spec
);
1053 static noinline_for_stack
1054 char *mac_address_string(char *buf
, char *end
, u8
*addr
,
1055 struct printf_spec spec
, const char *fmt
)
1057 char mac_addr
[sizeof("xx:xx:xx:xx:xx:xx")];
1061 bool reversed
= false;
1077 for (i
= 0; i
< 6; i
++) {
1079 p
= hex_byte_pack(p
, addr
[5 - i
]);
1081 p
= hex_byte_pack(p
, addr
[i
]);
1083 if (fmt
[0] == 'M' && i
!= 5)
1088 return string(buf
, end
, mac_addr
, spec
);
1091 static noinline_for_stack
1092 char *ip4_string(char *p
, const u8
*addr
, const char *fmt
)
1095 bool leading_zeros
= (fmt
[0] == 'i');
1120 for (i
= 0; i
< 4; i
++) {
1121 char temp
[4] __aligned(2); /* hold each IP quad in reverse order */
1122 int digits
= put_dec_trunc8(temp
, addr
[index
]) - temp
;
1123 if (leading_zeros
) {
1129 /* reverse the digits in the quad */
1131 *p
++ = temp
[digits
];
1141 static noinline_for_stack
1142 char *ip6_compressed_string(char *p
, const char *addr
)
1145 unsigned char zerolength
[8];
1150 bool needcolon
= false;
1152 struct in6_addr in6
;
1154 memcpy(&in6
, addr
, sizeof(struct in6_addr
));
1156 useIPv4
= ipv6_addr_v4mapped(&in6
) || ipv6_addr_is_isatap(&in6
);
1158 memset(zerolength
, 0, sizeof(zerolength
));
1165 /* find position of longest 0 run */
1166 for (i
= 0; i
< range
; i
++) {
1167 for (j
= i
; j
< range
; j
++) {
1168 if (in6
.s6_addr16
[j
] != 0)
1173 for (i
= 0; i
< range
; i
++) {
1174 if (zerolength
[i
] > longest
) {
1175 longest
= zerolength
[i
];
1179 if (longest
== 1) /* don't compress a single 0 */
1183 for (i
= 0; i
< range
; i
++) {
1184 if (i
== colonpos
) {
1185 if (needcolon
|| i
== 0)
1196 /* hex u16 without leading 0s */
1197 word
= ntohs(in6
.s6_addr16
[i
]);
1202 p
= hex_byte_pack(p
, hi
);
1204 *p
++ = hex_asc_lo(hi
);
1205 p
= hex_byte_pack(p
, lo
);
1208 p
= hex_byte_pack(p
, lo
);
1210 *p
++ = hex_asc_lo(lo
);
1217 p
= ip4_string(p
, &in6
.s6_addr
[12], "I4");
1224 static noinline_for_stack
1225 char *ip6_string(char *p
, const char *addr
, const char *fmt
)
1229 for (i
= 0; i
< 8; i
++) {
1230 p
= hex_byte_pack(p
, *addr
++);
1231 p
= hex_byte_pack(p
, *addr
++);
1232 if (fmt
[0] == 'I' && i
!= 7)
1240 static noinline_for_stack
1241 char *ip6_addr_string(char *buf
, char *end
, const u8
*addr
,
1242 struct printf_spec spec
, const char *fmt
)
1244 char ip6_addr
[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1246 if (fmt
[0] == 'I' && fmt
[2] == 'c')
1247 ip6_compressed_string(ip6_addr
, addr
);
1249 ip6_string(ip6_addr
, addr
, fmt
);
1251 return string(buf
, end
, ip6_addr
, spec
);
1254 static noinline_for_stack
1255 char *ip4_addr_string(char *buf
, char *end
, const u8
*addr
,
1256 struct printf_spec spec
, const char *fmt
)
1258 char ip4_addr
[sizeof("255.255.255.255")];
1260 ip4_string(ip4_addr
, addr
, fmt
);
1262 return string(buf
, end
, ip4_addr
, spec
);
1265 static noinline_for_stack
1266 char *ip6_addr_string_sa(char *buf
, char *end
, const struct sockaddr_in6
*sa
,
1267 struct printf_spec spec
, const char *fmt
)
1269 bool have_p
= false, have_s
= false, have_f
= false, have_c
= false;
1270 char ip6_addr
[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1271 sizeof(":12345") + sizeof("/123456789") +
1272 sizeof("%1234567890")];
1273 char *p
= ip6_addr
, *pend
= ip6_addr
+ sizeof(ip6_addr
);
1274 const u8
*addr
= (const u8
*) &sa
->sin6_addr
;
1275 char fmt6
[2] = { fmt
[0], '6' };
1279 while (isalpha(*++fmt
)) {
1296 if (have_p
|| have_s
|| have_f
) {
1301 if (fmt6
[0] == 'I' && have_c
)
1302 p
= ip6_compressed_string(ip6_addr
+ off
, addr
);
1304 p
= ip6_string(ip6_addr
+ off
, addr
, fmt6
);
1306 if (have_p
|| have_s
|| have_f
)
1311 p
= number(p
, pend
, ntohs(sa
->sin6_port
), spec
);
1315 p
= number(p
, pend
, ntohl(sa
->sin6_flowinfo
&
1316 IPV6_FLOWINFO_MASK
), spec
);
1320 p
= number(p
, pend
, sa
->sin6_scope_id
, spec
);
1324 return string(buf
, end
, ip6_addr
, spec
);
1327 static noinline_for_stack
1328 char *ip4_addr_string_sa(char *buf
, char *end
, const struct sockaddr_in
*sa
,
1329 struct printf_spec spec
, const char *fmt
)
1331 bool have_p
= false;
1332 char *p
, ip4_addr
[sizeof("255.255.255.255") + sizeof(":12345")];
1333 char *pend
= ip4_addr
+ sizeof(ip4_addr
);
1334 const u8
*addr
= (const u8
*) &sa
->sin_addr
.s_addr
;
1335 char fmt4
[3] = { fmt
[0], '4', 0 };
1338 while (isalpha(*++fmt
)) {
1352 p
= ip4_string(ip4_addr
, addr
, fmt4
);
1355 p
= number(p
, pend
, ntohs(sa
->sin_port
), spec
);
1359 return string(buf
, end
, ip4_addr
, spec
);
1362 static noinline_for_stack
1363 char *escaped_string(char *buf
, char *end
, u8
*addr
, struct printf_spec spec
,
1368 unsigned int flags
= 0;
1371 if (spec
.field_width
== 0)
1372 return buf
; /* nothing to print */
1374 if (ZERO_OR_NULL_PTR(addr
))
1375 return string(buf
, end
, NULL
, spec
); /* NULL pointer */
1379 switch (fmt
[count
++]) {
1381 flags
|= ESCAPE_ANY
;
1384 flags
|= ESCAPE_SPECIAL
;
1387 flags
|= ESCAPE_HEX
;
1390 flags
|= ESCAPE_NULL
;
1393 flags
|= ESCAPE_OCTAL
;
1399 flags
|= ESCAPE_SPACE
;
1408 flags
= ESCAPE_ANY_NP
;
1410 len
= spec
.field_width
< 0 ? 1 : spec
.field_width
;
1413 * string_escape_mem() writes as many characters as it can to
1414 * the given buffer, and returns the total size of the output
1415 * had the buffer been big enough.
1417 buf
+= string_escape_mem(addr
, len
, buf
, buf
< end
? end
- buf
: 0, flags
, NULL
);
1422 static noinline_for_stack
1423 char *uuid_string(char *buf
, char *end
, const u8
*addr
,
1424 struct printf_spec spec
, const char *fmt
)
1426 char uuid
[UUID_STRING_LEN
+ 1];
1429 const u8
*index
= uuid_index
;
1434 uc
= true; /* fall-through */
1443 for (i
= 0; i
< 16; i
++) {
1445 p
= hex_byte_pack_upper(p
, addr
[index
[i
]]);
1447 p
= hex_byte_pack(p
, addr
[index
[i
]]);
1460 return string(buf
, end
, uuid
, spec
);
1463 int kptr_restrict __read_mostly
;
1465 static noinline_for_stack
1466 char *restricted_pointer(char *buf
, char *end
, const void *ptr
,
1467 struct printf_spec spec
)
1469 switch (kptr_restrict
) {
1471 /* Always print %pK values */
1474 const struct cred
*cred
;
1477 * kptr_restrict==1 cannot be used in IRQ context
1478 * because its test for CAP_SYSLOG would be meaningless.
1480 if (in_irq() || in_serving_softirq() || in_nmi()) {
1481 if (spec
.field_width
== -1)
1482 spec
.field_width
= 2 * sizeof(ptr
);
1483 return string(buf
, end
, "pK-error", spec
);
1487 * Only print the real pointer value if the current
1488 * process has CAP_SYSLOG and is running with the
1489 * same credentials it started with. This is because
1490 * access to files is checked at open() time, but %pK
1491 * checks permission at read() time. We don't want to
1492 * leak pointer values if a binary opens a file using
1493 * %pK and then elevates privileges before reading it.
1495 cred
= current_cred();
1496 if (!has_capability_noaudit(current
, CAP_SYSLOG
) ||
1497 !uid_eq(cred
->euid
, cred
->uid
) ||
1498 !gid_eq(cred
->egid
, cred
->gid
))
1504 /* Always print 0's for %pK */
1509 return pointer_string(buf
, end
, ptr
, spec
);
1512 static noinline_for_stack
1513 char *netdev_bits(char *buf
, char *end
, const void *addr
,
1514 struct printf_spec spec
, const char *fmt
)
1516 unsigned long long num
;
1521 num
= *(const netdev_features_t
*)addr
;
1522 size
= sizeof(netdev_features_t
);
1525 return ptr_to_id(buf
, end
, addr
, spec
);
1528 return special_hex_number(buf
, end
, num
, size
);
1531 static noinline_for_stack
1532 char *address_val(char *buf
, char *end
, const void *addr
, const char *fmt
)
1534 unsigned long long num
;
1539 num
= *(const dma_addr_t
*)addr
;
1540 size
= sizeof(dma_addr_t
);
1544 num
= *(const phys_addr_t
*)addr
;
1545 size
= sizeof(phys_addr_t
);
1549 return special_hex_number(buf
, end
, num
, size
);
1552 static noinline_for_stack
1553 char *clock(char *buf
, char *end
, struct clk
*clk
, struct printf_spec spec
,
1556 if (!IS_ENABLED(CONFIG_HAVE_CLK
) || !clk
)
1557 return string(buf
, end
, NULL
, spec
);
1562 #ifdef CONFIG_COMMON_CLK
1563 return string(buf
, end
, __clk_get_name(clk
), spec
);
1565 return ptr_to_id(buf
, end
, clk
, spec
);
1571 char *format_flags(char *buf
, char *end
, unsigned long flags
,
1572 const struct trace_print_flags
*names
)
1576 for ( ; flags
&& names
->name
; names
++) {
1578 if ((flags
& mask
) != mask
)
1581 buf
= string(buf
, end
, names
->name
, default_str_spec
);
1592 buf
= number(buf
, end
, flags
, default_flag_spec
);
1597 static noinline_for_stack
1598 char *flags_string(char *buf
, char *end
, void *flags_ptr
, const char *fmt
)
1600 unsigned long flags
;
1601 const struct trace_print_flags
*names
;
1605 flags
= *(unsigned long *)flags_ptr
;
1606 /* Remove zone id */
1607 flags
&= (1UL << NR_PAGEFLAGS
) - 1;
1608 names
= pageflag_names
;
1611 flags
= *(unsigned long *)flags_ptr
;
1612 names
= vmaflag_names
;
1615 flags
= *(gfp_t
*)flags_ptr
;
1616 names
= gfpflag_names
;
1619 WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt
[1]);
1623 return format_flags(buf
, end
, flags
, names
);
1626 static const char *device_node_name_for_depth(const struct device_node
*np
, int depth
)
1628 for ( ; np
&& depth
; depth
--)
1631 return kbasename(np
->full_name
);
1634 static noinline_for_stack
1635 char *device_node_gen_full_name(const struct device_node
*np
, char *buf
, char *end
)
1638 const struct device_node
*parent
= np
->parent
;
1640 /* special case for root node */
1642 return string(buf
, end
, "/", default_str_spec
);
1644 for (depth
= 0; parent
->parent
; depth
++)
1645 parent
= parent
->parent
;
1647 for ( ; depth
>= 0; depth
--) {
1648 buf
= string(buf
, end
, "/", default_str_spec
);
1649 buf
= string(buf
, end
, device_node_name_for_depth(np
, depth
),
1655 static noinline_for_stack
1656 char *device_node_string(char *buf
, char *end
, struct device_node
*dn
,
1657 struct printf_spec spec
, const char *fmt
)
1659 char tbuf
[sizeof("xxxx") + 1];
1662 char *buf_start
= buf
;
1663 struct property
*prop
;
1664 bool has_mult
, pass
;
1665 static const struct printf_spec num_spec
= {
1672 struct printf_spec str_spec
= spec
;
1673 str_spec
.field_width
= -1;
1675 if (!IS_ENABLED(CONFIG_OF
))
1676 return string(buf
, end
, "(!OF)", spec
);
1678 if ((unsigned long)dn
< PAGE_SIZE
)
1679 return string(buf
, end
, "(null)", spec
);
1681 /* simple case without anything any more format specifiers */
1683 if (fmt
[0] == '\0' || strcspn(fmt
,"fnpPFcC") > 0)
1686 for (pass
= false; strspn(fmt
,"fnpPFcC"); fmt
++, pass
= true) {
1695 case 'f': /* full_name */
1696 buf
= device_node_gen_full_name(dn
, buf
, end
);
1698 case 'n': /* name */
1699 p
= kbasename(of_node_full_name(dn
));
1700 precision
= str_spec
.precision
;
1701 str_spec
.precision
= strchrnul(p
, '@') - p
;
1702 buf
= string(buf
, end
, p
, str_spec
);
1703 str_spec
.precision
= precision
;
1705 case 'p': /* phandle */
1706 buf
= number(buf
, end
, (unsigned int)dn
->phandle
, num_spec
);
1708 case 'P': /* path-spec */
1709 p
= kbasename(of_node_full_name(dn
));
1712 buf
= string(buf
, end
, p
, str_spec
);
1714 case 'F': /* flags */
1715 tbuf
[0] = of_node_check_flag(dn
, OF_DYNAMIC
) ? 'D' : '-';
1716 tbuf
[1] = of_node_check_flag(dn
, OF_DETACHED
) ? 'd' : '-';
1717 tbuf
[2] = of_node_check_flag(dn
, OF_POPULATED
) ? 'P' : '-';
1718 tbuf
[3] = of_node_check_flag(dn
, OF_POPULATED_BUS
) ? 'B' : '-';
1720 buf
= string(buf
, end
, tbuf
, str_spec
);
1722 case 'c': /* major compatible string */
1723 ret
= of_property_read_string(dn
, "compatible", &p
);
1725 buf
= string(buf
, end
, p
, str_spec
);
1727 case 'C': /* full compatible string */
1729 of_property_for_each_string(dn
, "compatible", prop
, p
) {
1731 buf
= string(buf
, end
, ",", str_spec
);
1732 buf
= string(buf
, end
, "\"", str_spec
);
1733 buf
= string(buf
, end
, p
, str_spec
);
1734 buf
= string(buf
, end
, "\"", str_spec
);
1744 return widen_string(buf
, buf
- buf_start
, end
, spec
);
1748 * Show a '%p' thing. A kernel extension is that the '%p' is followed
1749 * by an extra set of alphanumeric characters that are extended format
1752 * Please update scripts/checkpatch.pl when adding/removing conversion
1753 * characters. (Search for "check for vsprintf extension").
1755 * Right now we handle:
1757 * - 'S' For symbolic direct pointers (or function descriptors) with offset
1758 * - 's' For symbolic direct pointers (or function descriptors) without offset
1761 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
1762 * - 'B' For backtraced symbolic direct pointers with offset
1763 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
1764 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
1765 * - 'b[l]' For a bitmap, the number of bits is determined by the field
1766 * width which must be explicitly specified either as part of the
1767 * format string '%32b[l]' or through '%*b[l]', [l] selects
1768 * range-list format instead of hex format
1769 * - 'M' For a 6-byte MAC address, it prints the address in the
1770 * usual colon-separated hex notation
1771 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
1772 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
1773 * with a dash-separated hex notation
1774 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
1775 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
1776 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
1777 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
1779 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1780 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1781 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
1782 * IPv6 omits the colons (01020304...0f)
1783 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
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 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
1788 * - 'I[6S]c' for IPv6 addresses printed as specified by
1789 * http://tools.ietf.org/html/rfc5952
1790 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
1791 * of the following flags (see string_escape_mem() for the
1794 * c - ESCAPE_SPECIAL
1800 * By default ESCAPE_ANY_NP is used.
1801 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
1802 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
1803 * Options for %pU are:
1804 * b big endian lower case hex (default)
1805 * B big endian UPPER case hex
1806 * l little endian lower case hex
1807 * L little endian UPPER case hex
1808 * big endian output byte order is:
1809 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
1810 * little endian output byte order is:
1811 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
1812 * - 'V' For a struct va_format which contains a format string * and va_list *,
1813 * call vsnprintf(->format, *->va_list).
1814 * Implements a "recursive vsnprintf".
1815 * Do not use this feature without some mechanism to verify the
1816 * correctness of the format string and va_list arguments.
1817 * - 'K' For a kernel pointer that should be hidden from unprivileged users
1818 * - 'NF' For a netdev_features_t
1819 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
1820 * a certain separator (' ' by default):
1824 * The maximum supported length is 64 bytes of the input. Consider
1825 * to use print_hex_dump() for the larger input.
1826 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
1827 * (default assumed to be phys_addr_t, passed by reference)
1828 * - 'd[234]' For a dentry name (optionally 2-4 last components)
1829 * - 'D[234]' Same as 'd' but for a struct file
1830 * - 'g' For block_device name (gendisk + partition number)
1831 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
1832 * (legacy clock framework) of the clock
1833 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
1834 * (legacy clock framework) of the clock
1835 * - 'Cr' For a clock, it prints the current rate of the clock
1836 * - 'G' For flags to be printed as a collection of symbolic strings that would
1837 * construct the specific value. Supported flags given by option:
1838 * p page flags (see struct page) given as pointer to unsigned long
1839 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
1840 * v vma flags (VM_*) given as pointer to unsigned long
1841 * - 'OF[fnpPcCF]' For a device tree object
1842 * Without any optional arguments prints the full_name
1843 * f device node full_name
1844 * n device node name
1845 * p device node phandle
1846 * P device node path spec (name + @unit)
1847 * F device node flags
1848 * c major compatible string
1849 * C full compatible string
1850 * - 'x' For printing the address. Equivalent to "%lx".
1852 * ** When making changes please also update:
1853 * Documentation/core-api/printk-formats.rst
1855 * Note: The default behaviour (unadorned %p) is to hash the address,
1856 * rendering it useful as a unique identifier.
1858 static noinline_for_stack
1859 char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
1860 struct printf_spec spec
)
1862 const int default_width
= 2 * sizeof(void *);
1864 if (!ptr
&& *fmt
!= 'K' && *fmt
!= 'x') {
1866 * Print (null) with the same width as a pointer so it makes
1867 * tabular output look nice.
1869 if (spec
.field_width
== -1)
1870 spec
.field_width
= default_width
;
1871 return string(buf
, end
, "(null)", spec
);
1879 ptr
= dereference_symbol_descriptor(ptr
);
1882 return symbol_string(buf
, end
, ptr
, spec
, fmt
);
1885 return resource_string(buf
, end
, ptr
, spec
, fmt
);
1887 return hex_string(buf
, end
, ptr
, spec
, fmt
);
1891 return bitmap_list_string(buf
, end
, ptr
, spec
, fmt
);
1893 return bitmap_string(buf
, end
, ptr
, spec
, fmt
);
1895 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1896 case 'm': /* Contiguous: 000102030405 */
1898 /* [mM]R (Reverse order; Bluetooth) */
1899 return mac_address_string(buf
, end
, ptr
, spec
, fmt
);
1900 case 'I': /* Formatted IP supported
1902 * 6: 0001:0203:...:0708
1903 * 6c: 1::708 or 1::1.2.3.4
1905 case 'i': /* Contiguous:
1906 * 4: 001.002.003.004
1911 return ip6_addr_string(buf
, end
, ptr
, spec
, fmt
);
1913 return ip4_addr_string(buf
, end
, ptr
, spec
, fmt
);
1916 struct sockaddr raw
;
1917 struct sockaddr_in v4
;
1918 struct sockaddr_in6 v6
;
1921 switch (sa
->raw
.sa_family
) {
1923 return ip4_addr_string_sa(buf
, end
, &sa
->v4
, spec
, fmt
);
1925 return ip6_addr_string_sa(buf
, end
, &sa
->v6
, spec
, fmt
);
1927 return string(buf
, end
, "(invalid address)", spec
);
1932 return escaped_string(buf
, end
, ptr
, spec
, fmt
);
1934 return uuid_string(buf
, end
, ptr
, spec
, fmt
);
1939 va_copy(va
, *((struct va_format
*)ptr
)->va
);
1940 buf
+= vsnprintf(buf
, end
> buf
? end
- buf
: 0,
1941 ((struct va_format
*)ptr
)->fmt
, va
);
1948 return restricted_pointer(buf
, end
, ptr
, spec
);
1950 return netdev_bits(buf
, end
, ptr
, spec
, fmt
);
1952 return address_val(buf
, end
, ptr
, fmt
);
1954 return dentry_name(buf
, end
, ptr
, spec
, fmt
);
1956 return clock(buf
, end
, ptr
, spec
, fmt
);
1958 return dentry_name(buf
, end
,
1959 ((const struct file
*)ptr
)->f_path
.dentry
,
1963 return bdev_name(buf
, end
, ptr
, spec
, fmt
);
1967 return flags_string(buf
, end
, ptr
, fmt
);
1971 return device_node_string(buf
, end
, ptr
, spec
, fmt
+ 1);
1975 return pointer_string(buf
, end
, ptr
, spec
);
1978 /* default is to _not_ leak addresses, hash before printing */
1979 return ptr_to_id(buf
, end
, ptr
, spec
);
1983 * Helper function to decode printf style format.
1984 * Each call decode a token from the format and return the
1985 * number of characters read (or likely the delta where it wants
1986 * to go on the next call).
1987 * The decoded token is returned through the parameters
1989 * 'h', 'l', or 'L' for integer fields
1990 * 'z' support added 23/7/1999 S.H.
1991 * 'z' changed to 'Z' --davidm 1/25/99
1992 * 'Z' changed to 'z' --adobriyan 2017-01-25
1993 * 't' added for ptrdiff_t
1995 * @fmt: the format string
1996 * @type of the token returned
1997 * @flags: various flags such as +, -, # tokens..
1998 * @field_width: overwritten width
1999 * @base: base of the number (octal, hex, ...)
2000 * @precision: precision of a number
2001 * @qualifier: qualifier of a number (long, size_t, ...)
2003 static noinline_for_stack
2004 int format_decode(const char *fmt
, struct printf_spec
*spec
)
2006 const char *start
= fmt
;
2009 /* we finished early by reading the field width */
2010 if (spec
->type
== FORMAT_TYPE_WIDTH
) {
2011 if (spec
->field_width
< 0) {
2012 spec
->field_width
= -spec
->field_width
;
2013 spec
->flags
|= LEFT
;
2015 spec
->type
= FORMAT_TYPE_NONE
;
2019 /* we finished early by reading the precision */
2020 if (spec
->type
== FORMAT_TYPE_PRECISION
) {
2021 if (spec
->precision
< 0)
2022 spec
->precision
= 0;
2024 spec
->type
= FORMAT_TYPE_NONE
;
2029 spec
->type
= FORMAT_TYPE_NONE
;
2031 for (; *fmt
; ++fmt
) {
2036 /* Return the current non-format string */
2037 if (fmt
!= start
|| !*fmt
)
2043 while (1) { /* this also skips first '%' */
2049 case '-': spec
->flags
|= LEFT
; break;
2050 case '+': spec
->flags
|= PLUS
; break;
2051 case ' ': spec
->flags
|= SPACE
; break;
2052 case '#': spec
->flags
|= SPECIAL
; break;
2053 case '0': spec
->flags
|= ZEROPAD
; break;
2054 default: found
= false;
2061 /* get field width */
2062 spec
->field_width
= -1;
2065 spec
->field_width
= skip_atoi(&fmt
);
2066 else if (*fmt
== '*') {
2067 /* it's the next argument */
2068 spec
->type
= FORMAT_TYPE_WIDTH
;
2069 return ++fmt
- start
;
2073 /* get the precision */
2074 spec
->precision
= -1;
2077 if (isdigit(*fmt
)) {
2078 spec
->precision
= skip_atoi(&fmt
);
2079 if (spec
->precision
< 0)
2080 spec
->precision
= 0;
2081 } else if (*fmt
== '*') {
2082 /* it's the next argument */
2083 spec
->type
= FORMAT_TYPE_PRECISION
;
2084 return ++fmt
- start
;
2089 /* get the conversion qualifier */
2091 if (*fmt
== 'h' || _tolower(*fmt
) == 'l' ||
2092 *fmt
== 'z' || *fmt
== 't') {
2094 if (unlikely(qualifier
== *fmt
)) {
2095 if (qualifier
== 'l') {
2098 } else if (qualifier
== 'h') {
2109 spec
->type
= FORMAT_TYPE_CHAR
;
2110 return ++fmt
- start
;
2113 spec
->type
= FORMAT_TYPE_STR
;
2114 return ++fmt
- start
;
2117 spec
->type
= FORMAT_TYPE_PTR
;
2118 return ++fmt
- start
;
2121 spec
->type
= FORMAT_TYPE_PERCENT_CHAR
;
2122 return ++fmt
- start
;
2124 /* integer number formats - set up the flags and "break" */
2130 spec
->flags
|= SMALL
;
2139 spec
->flags
|= SIGN
;
2145 * Since %n poses a greater security risk than
2146 * utility, treat it as any other invalid or
2147 * unsupported format specifier.
2152 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt
);
2153 spec
->type
= FORMAT_TYPE_INVALID
;
2157 if (qualifier
== 'L')
2158 spec
->type
= FORMAT_TYPE_LONG_LONG
;
2159 else if (qualifier
== 'l') {
2160 BUILD_BUG_ON(FORMAT_TYPE_ULONG
+ SIGN
!= FORMAT_TYPE_LONG
);
2161 spec
->type
= FORMAT_TYPE_ULONG
+ (spec
->flags
& SIGN
);
2162 } else if (qualifier
== 'z') {
2163 spec
->type
= FORMAT_TYPE_SIZE_T
;
2164 } else if (qualifier
== 't') {
2165 spec
->type
= FORMAT_TYPE_PTRDIFF
;
2166 } else if (qualifier
== 'H') {
2167 BUILD_BUG_ON(FORMAT_TYPE_UBYTE
+ SIGN
!= FORMAT_TYPE_BYTE
);
2168 spec
->type
= FORMAT_TYPE_UBYTE
+ (spec
->flags
& SIGN
);
2169 } else if (qualifier
== 'h') {
2170 BUILD_BUG_ON(FORMAT_TYPE_USHORT
+ SIGN
!= FORMAT_TYPE_SHORT
);
2171 spec
->type
= FORMAT_TYPE_USHORT
+ (spec
->flags
& SIGN
);
2173 BUILD_BUG_ON(FORMAT_TYPE_UINT
+ SIGN
!= FORMAT_TYPE_INT
);
2174 spec
->type
= FORMAT_TYPE_UINT
+ (spec
->flags
& SIGN
);
2177 return ++fmt
- start
;
2181 set_field_width(struct printf_spec
*spec
, int width
)
2183 spec
->field_width
= width
;
2184 if (WARN_ONCE(spec
->field_width
!= width
, "field width %d too large", width
)) {
2185 spec
->field_width
= clamp(width
, -FIELD_WIDTH_MAX
, FIELD_WIDTH_MAX
);
2190 set_precision(struct printf_spec
*spec
, int prec
)
2192 spec
->precision
= prec
;
2193 if (WARN_ONCE(spec
->precision
!= prec
, "precision %d too large", prec
)) {
2194 spec
->precision
= clamp(prec
, 0, PRECISION_MAX
);
2199 * vsnprintf - Format a string and place it in a buffer
2200 * @buf: The buffer to place the result into
2201 * @size: The size of the buffer, including the trailing null space
2202 * @fmt: The format string to use
2203 * @args: Arguments for the format string
2205 * This function generally follows C99 vsnprintf, but has some
2206 * extensions and a few limitations:
2208 * - ``%n`` is unsupported
2209 * - ``%p*`` is handled by pointer()
2211 * See pointer() or Documentation/core-api/printk-formats.rst for more
2212 * extensive description.
2214 * **Please update the documentation in both places when making changes**
2216 * The return value is the number of characters which would
2217 * be generated for the given input, excluding the trailing
2218 * '\0', as per ISO C99. If you want to have the exact
2219 * number of characters written into @buf as return value
2220 * (not including the trailing '\0'), use vscnprintf(). If the
2221 * return is greater than or equal to @size, the resulting
2222 * string is truncated.
2224 * If you're not already dealing with a va_list consider using snprintf().
2226 int vsnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
2228 unsigned long long num
;
2230 struct printf_spec spec
= {0};
2232 /* Reject out-of-range values early. Large positive sizes are
2233 used for unknown buffer sizes. */
2234 if (WARN_ON_ONCE(size
> INT_MAX
))
2240 /* Make sure end is always >= buf */
2247 const char *old_fmt
= fmt
;
2248 int read
= format_decode(fmt
, &spec
);
2252 switch (spec
.type
) {
2253 case FORMAT_TYPE_NONE
: {
2256 if (copy
> end
- str
)
2258 memcpy(str
, old_fmt
, copy
);
2264 case FORMAT_TYPE_WIDTH
:
2265 set_field_width(&spec
, va_arg(args
, int));
2268 case FORMAT_TYPE_PRECISION
:
2269 set_precision(&spec
, va_arg(args
, int));
2272 case FORMAT_TYPE_CHAR
: {
2275 if (!(spec
.flags
& LEFT
)) {
2276 while (--spec
.field_width
> 0) {
2283 c
= (unsigned char) va_arg(args
, int);
2287 while (--spec
.field_width
> 0) {
2295 case FORMAT_TYPE_STR
:
2296 str
= string(str
, end
, va_arg(args
, char *), spec
);
2299 case FORMAT_TYPE_PTR
:
2300 str
= pointer(fmt
, str
, end
, va_arg(args
, void *),
2302 while (isalnum(*fmt
))
2306 case FORMAT_TYPE_PERCENT_CHAR
:
2312 case FORMAT_TYPE_INVALID
:
2314 * Presumably the arguments passed gcc's type
2315 * checking, but there is no safe or sane way
2316 * for us to continue parsing the format and
2317 * fetching from the va_list; the remaining
2318 * specifiers and arguments would be out of
2324 switch (spec
.type
) {
2325 case FORMAT_TYPE_LONG_LONG
:
2326 num
= va_arg(args
, long long);
2328 case FORMAT_TYPE_ULONG
:
2329 num
= va_arg(args
, unsigned long);
2331 case FORMAT_TYPE_LONG
:
2332 num
= va_arg(args
, long);
2334 case FORMAT_TYPE_SIZE_T
:
2335 if (spec
.flags
& SIGN
)
2336 num
= va_arg(args
, ssize_t
);
2338 num
= va_arg(args
, size_t);
2340 case FORMAT_TYPE_PTRDIFF
:
2341 num
= va_arg(args
, ptrdiff_t);
2343 case FORMAT_TYPE_UBYTE
:
2344 num
= (unsigned char) va_arg(args
, int);
2346 case FORMAT_TYPE_BYTE
:
2347 num
= (signed char) va_arg(args
, int);
2349 case FORMAT_TYPE_USHORT
:
2350 num
= (unsigned short) va_arg(args
, int);
2352 case FORMAT_TYPE_SHORT
:
2353 num
= (short) va_arg(args
, int);
2355 case FORMAT_TYPE_INT
:
2356 num
= (int) va_arg(args
, int);
2359 num
= va_arg(args
, unsigned int);
2362 str
= number(str
, end
, num
, spec
);
2374 /* the trailing null byte doesn't count towards the total */
2378 EXPORT_SYMBOL(vsnprintf
);
2381 * vscnprintf - Format a string and place it in a buffer
2382 * @buf: The buffer to place the result into
2383 * @size: The size of the buffer, including the trailing null space
2384 * @fmt: The format string to use
2385 * @args: Arguments for the format string
2387 * The return value is the number of characters which have been written into
2388 * the @buf not including the trailing '\0'. If @size is == 0 the function
2391 * If you're not already dealing with a va_list consider using scnprintf().
2393 * See the vsnprintf() documentation for format string extensions over C99.
2395 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
2399 i
= vsnprintf(buf
, size
, fmt
, args
);
2401 if (likely(i
< size
))
2407 EXPORT_SYMBOL(vscnprintf
);
2410 * snprintf - Format a string and place it in a buffer
2411 * @buf: The buffer to place the result into
2412 * @size: The size of the buffer, including the trailing null space
2413 * @fmt: The format string to use
2414 * @...: Arguments for the format string
2416 * The return value is the number of characters which would be
2417 * generated for the given input, excluding the trailing null,
2418 * as per ISO C99. If the return is greater than or equal to
2419 * @size, the resulting string is truncated.
2421 * See the vsnprintf() documentation for format string extensions over C99.
2423 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
2428 va_start(args
, fmt
);
2429 i
= vsnprintf(buf
, size
, fmt
, args
);
2434 EXPORT_SYMBOL(snprintf
);
2437 * scnprintf - Format a string and place it in a buffer
2438 * @buf: The buffer to place the result into
2439 * @size: The size of the buffer, including the trailing null space
2440 * @fmt: The format string to use
2441 * @...: Arguments for the format string
2443 * The return value is the number of characters written into @buf not including
2444 * the trailing '\0'. If @size is == 0 the function returns 0.
2447 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
2452 va_start(args
, fmt
);
2453 i
= vscnprintf(buf
, size
, fmt
, args
);
2458 EXPORT_SYMBOL(scnprintf
);
2461 * vsprintf - Format a string and place it in a buffer
2462 * @buf: The buffer to place the result into
2463 * @fmt: The format string to use
2464 * @args: Arguments for the format string
2466 * The function returns the number of characters written
2467 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
2470 * If you're not already dealing with a va_list consider using sprintf().
2472 * See the vsnprintf() documentation for format string extensions over C99.
2474 int vsprintf(char *buf
, const char *fmt
, va_list args
)
2476 return vsnprintf(buf
, INT_MAX
, fmt
, args
);
2478 EXPORT_SYMBOL(vsprintf
);
2481 * sprintf - Format a string and place it in a buffer
2482 * @buf: The buffer to place the result into
2483 * @fmt: The format string to use
2484 * @...: Arguments for the format string
2486 * The function returns the number of characters written
2487 * into @buf. Use snprintf() or scnprintf() in order to avoid
2490 * See the vsnprintf() documentation for format string extensions over C99.
2492 int sprintf(char *buf
, const char *fmt
, ...)
2497 va_start(args
, fmt
);
2498 i
= vsnprintf(buf
, INT_MAX
, fmt
, args
);
2503 EXPORT_SYMBOL(sprintf
);
2505 #ifdef CONFIG_BINARY_PRINTF
2508 * vbin_printf() - VA arguments to binary data
2509 * bstr_printf() - Binary data to text string
2513 * vbin_printf - Parse a format string and place args' binary value in a buffer
2514 * @bin_buf: The buffer to place args' binary value
2515 * @size: The size of the buffer(by words(32bits), not characters)
2516 * @fmt: The format string to use
2517 * @args: Arguments for the format string
2519 * The format follows C99 vsnprintf, except %n is ignored, and its argument
2522 * The return value is the number of words(32bits) which would be generated for
2526 * If the return value is greater than @size, the resulting bin_buf is NOT
2527 * valid for bstr_printf().
2529 int vbin_printf(u32
*bin_buf
, size_t size
, const char *fmt
, va_list args
)
2531 struct printf_spec spec
= {0};
2535 str
= (char *)bin_buf
;
2536 end
= (char *)(bin_buf
+ size
);
2538 #define save_arg(type) \
2540 unsigned long long value; \
2541 if (sizeof(type) == 8) { \
2542 unsigned long long val8; \
2543 str = PTR_ALIGN(str, sizeof(u32)); \
2544 val8 = va_arg(args, unsigned long long); \
2545 if (str + sizeof(type) <= end) { \
2546 *(u32 *)str = *(u32 *)&val8; \
2547 *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \
2551 unsigned int val4; \
2552 str = PTR_ALIGN(str, sizeof(type)); \
2553 val4 = va_arg(args, int); \
2554 if (str + sizeof(type) <= end) \
2555 *(typeof(type) *)str = (type)(long)val4; \
2556 value = (unsigned long long)val4; \
2558 str += sizeof(type); \
2563 int read
= format_decode(fmt
, &spec
);
2567 switch (spec
.type
) {
2568 case FORMAT_TYPE_NONE
:
2569 case FORMAT_TYPE_PERCENT_CHAR
:
2571 case FORMAT_TYPE_INVALID
:
2574 case FORMAT_TYPE_WIDTH
:
2575 case FORMAT_TYPE_PRECISION
:
2576 width
= (int)save_arg(int);
2577 /* Pointers may require the width */
2579 set_field_width(&spec
, width
);
2582 case FORMAT_TYPE_CHAR
:
2586 case FORMAT_TYPE_STR
: {
2587 const char *save_str
= va_arg(args
, char *);
2590 if ((unsigned long)save_str
> (unsigned long)-PAGE_SIZE
2591 || (unsigned long)save_str
< PAGE_SIZE
)
2592 save_str
= "(null)";
2593 len
= strlen(save_str
) + 1;
2594 if (str
+ len
< end
)
2595 memcpy(str
, save_str
, len
);
2600 case FORMAT_TYPE_PTR
:
2601 /* Dereferenced pointers must be done now */
2603 /* Dereference of functions is still OK */
2613 if (!isalnum(*fmt
)) {
2617 str
= pointer(fmt
, str
, end
, va_arg(args
, void *),
2622 end
[-1] = '\0'; /* Must be nul terminated */
2624 /* skip all alphanumeric pointer suffixes */
2625 while (isalnum(*fmt
))
2630 switch (spec
.type
) {
2632 case FORMAT_TYPE_LONG_LONG
:
2633 save_arg(long long);
2635 case FORMAT_TYPE_ULONG
:
2636 case FORMAT_TYPE_LONG
:
2637 save_arg(unsigned long);
2639 case FORMAT_TYPE_SIZE_T
:
2642 case FORMAT_TYPE_PTRDIFF
:
2643 save_arg(ptrdiff_t);
2645 case FORMAT_TYPE_UBYTE
:
2646 case FORMAT_TYPE_BYTE
:
2649 case FORMAT_TYPE_USHORT
:
2650 case FORMAT_TYPE_SHORT
:
2660 return (u32
*)(PTR_ALIGN(str
, sizeof(u32
))) - bin_buf
;
2663 EXPORT_SYMBOL_GPL(vbin_printf
);
2666 * bstr_printf - Format a string from binary arguments and place it in a buffer
2667 * @buf: The buffer to place the result into
2668 * @size: The size of the buffer, including the trailing null space
2669 * @fmt: The format string to use
2670 * @bin_buf: Binary arguments for the format string
2672 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
2673 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
2674 * a binary buffer that generated by vbin_printf.
2676 * The format follows C99 vsnprintf, but has some extensions:
2677 * see vsnprintf comment for details.
2679 * The return value is the number of characters which would
2680 * be generated for the given input, excluding the trailing
2681 * '\0', as per ISO C99. If you want to have the exact
2682 * number of characters written into @buf as return value
2683 * (not including the trailing '\0'), use vscnprintf(). If the
2684 * return is greater than or equal to @size, the resulting
2685 * string is truncated.
2687 int bstr_printf(char *buf
, size_t size
, const char *fmt
, const u32
*bin_buf
)
2689 struct printf_spec spec
= {0};
2691 const char *args
= (const char *)bin_buf
;
2693 if (WARN_ON_ONCE(size
> INT_MAX
))
2699 #define get_arg(type) \
2701 typeof(type) value; \
2702 if (sizeof(type) == 8) { \
2703 args = PTR_ALIGN(args, sizeof(u32)); \
2704 *(u32 *)&value = *(u32 *)args; \
2705 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
2707 args = PTR_ALIGN(args, sizeof(type)); \
2708 value = *(typeof(type) *)args; \
2710 args += sizeof(type); \
2714 /* Make sure end is always >= buf */
2721 const char *old_fmt
= fmt
;
2722 int read
= format_decode(fmt
, &spec
);
2726 switch (spec
.type
) {
2727 case FORMAT_TYPE_NONE
: {
2730 if (copy
> end
- str
)
2732 memcpy(str
, old_fmt
, copy
);
2738 case FORMAT_TYPE_WIDTH
:
2739 set_field_width(&spec
, get_arg(int));
2742 case FORMAT_TYPE_PRECISION
:
2743 set_precision(&spec
, get_arg(int));
2746 case FORMAT_TYPE_CHAR
: {
2749 if (!(spec
.flags
& LEFT
)) {
2750 while (--spec
.field_width
> 0) {
2756 c
= (unsigned char) get_arg(char);
2760 while (--spec
.field_width
> 0) {
2768 case FORMAT_TYPE_STR
: {
2769 const char *str_arg
= args
;
2770 args
+= strlen(str_arg
) + 1;
2771 str
= string(str
, end
, (char *)str_arg
, spec
);
2775 case FORMAT_TYPE_PTR
: {
2776 bool process
= false;
2778 /* Non function dereferences were already done */
2789 if (!isalnum(*fmt
)) {
2793 /* Pointer dereference was already processed */
2795 len
= copy
= strlen(args
);
2796 if (copy
> end
- str
)
2798 memcpy(str
, args
, copy
);
2804 str
= pointer(fmt
, str
, end
, get_arg(void *), spec
);
2806 while (isalnum(*fmt
))
2811 case FORMAT_TYPE_PERCENT_CHAR
:
2817 case FORMAT_TYPE_INVALID
:
2821 unsigned long long num
;
2823 switch (spec
.type
) {
2825 case FORMAT_TYPE_LONG_LONG
:
2826 num
= get_arg(long long);
2828 case FORMAT_TYPE_ULONG
:
2829 case FORMAT_TYPE_LONG
:
2830 num
= get_arg(unsigned long);
2832 case FORMAT_TYPE_SIZE_T
:
2833 num
= get_arg(size_t);
2835 case FORMAT_TYPE_PTRDIFF
:
2836 num
= get_arg(ptrdiff_t);
2838 case FORMAT_TYPE_UBYTE
:
2839 num
= get_arg(unsigned char);
2841 case FORMAT_TYPE_BYTE
:
2842 num
= get_arg(signed char);
2844 case FORMAT_TYPE_USHORT
:
2845 num
= get_arg(unsigned short);
2847 case FORMAT_TYPE_SHORT
:
2848 num
= get_arg(short);
2850 case FORMAT_TYPE_UINT
:
2851 num
= get_arg(unsigned int);
2857 str
= number(str
, end
, num
, spec
);
2859 } /* switch(spec.type) */
2872 /* the trailing null byte doesn't count towards the total */
2875 EXPORT_SYMBOL_GPL(bstr_printf
);
2878 * bprintf - Parse a format string and place args' binary value in a buffer
2879 * @bin_buf: The buffer to place args' binary value
2880 * @size: The size of the buffer(by words(32bits), not characters)
2881 * @fmt: The format string to use
2882 * @...: Arguments for the format string
2884 * The function returns the number of words(u32) written
2887 int bprintf(u32
*bin_buf
, size_t size
, const char *fmt
, ...)
2892 va_start(args
, fmt
);
2893 ret
= vbin_printf(bin_buf
, size
, fmt
, args
);
2898 EXPORT_SYMBOL_GPL(bprintf
);
2900 #endif /* CONFIG_BINARY_PRINTF */
2903 * vsscanf - Unformat a buffer into a list of arguments
2904 * @buf: input buffer
2905 * @fmt: format of buffer
2908 int vsscanf(const char *buf
, const char *fmt
, va_list args
)
2910 const char *str
= buf
;
2918 unsigned long long u
;
2924 /* skip any white space in format */
2925 /* white space in format matchs any amount of
2926 * white space, including none, in the input.
2928 if (isspace(*fmt
)) {
2929 fmt
= skip_spaces(++fmt
);
2930 str
= skip_spaces(str
);
2933 /* anything that is not a conversion must match exactly */
2934 if (*fmt
!= '%' && *fmt
) {
2935 if (*fmt
++ != *str
++)
2944 /* skip this conversion.
2945 * advance both strings to next white space
2950 while (!isspace(*fmt
) && *fmt
!= '%' && *fmt
) {
2951 /* '%*[' not yet supported, invalid format */
2956 while (!isspace(*str
) && *str
)
2961 /* get field width */
2963 if (isdigit(*fmt
)) {
2964 field_width
= skip_atoi(&fmt
);
2965 if (field_width
<= 0)
2969 /* get conversion qualifier */
2971 if (*fmt
== 'h' || _tolower(*fmt
) == 'l' ||
2974 if (unlikely(qualifier
== *fmt
)) {
2975 if (qualifier
== 'h') {
2978 } else if (qualifier
== 'l') {
2989 /* return number of characters read so far */
2990 *va_arg(args
, int *) = str
- buf
;
3004 char *s
= (char *)va_arg(args
, char*);
3005 if (field_width
== -1)
3009 } while (--field_width
> 0 && *str
);
3015 char *s
= (char *)va_arg(args
, char *);
3016 if (field_width
== -1)
3017 field_width
= SHRT_MAX
;
3018 /* first, skip leading white space in buffer */
3019 str
= skip_spaces(str
);
3021 /* now copy until next white space */
3022 while (*str
&& !isspace(*str
) && field_width
--)
3029 * Warning: This implementation of the '[' conversion specifier
3030 * deviates from its glibc counterpart in the following ways:
3031 * (1) It does NOT support ranges i.e. '-' is NOT a special
3033 * (2) It cannot match the closing bracket ']' itself
3034 * (3) A field width is required
3035 * (4) '%*[' (discard matching input) is currently not supported
3038 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
3039 * buf1, buf2, buf3);
3045 char *s
= (char *)va_arg(args
, char *);
3046 DECLARE_BITMAP(set
, 256) = {0};
3047 unsigned int len
= 0;
3048 bool negate
= (*fmt
== '^');
3050 /* field width is required */
3051 if (field_width
== -1)
3057 for ( ; *fmt
&& *fmt
!= ']'; ++fmt
, ++len
)
3058 set_bit((u8
)*fmt
, set
);
3060 /* no ']' or no character set found */
3066 bitmap_complement(set
, set
, 256);
3067 /* exclude null '\0' byte */
3071 /* match must be non-empty */
3072 if (!test_bit((u8
)*str
, set
))
3075 while (test_bit((u8
)*str
, set
) && field_width
--)
3097 /* looking for '%' in str */
3102 /* invalid format; stop here */
3106 /* have some sort of integer conversion.
3107 * first, skip white space in buffer.
3109 str
= skip_spaces(str
);
3112 if (is_sign
&& digit
== '-')
3116 || (base
== 16 && !isxdigit(digit
))
3117 || (base
== 10 && !isdigit(digit
))
3118 || (base
== 8 && (!isdigit(digit
) || digit
> '7'))
3119 || (base
== 0 && !isdigit(digit
)))
3123 val
.s
= qualifier
!= 'L' ?
3124 simple_strtol(str
, &next
, base
) :
3125 simple_strtoll(str
, &next
, base
);
3127 val
.u
= qualifier
!= 'L' ?
3128 simple_strtoul(str
, &next
, base
) :
3129 simple_strtoull(str
, &next
, base
);
3131 if (field_width
> 0 && next
- str
> field_width
) {
3133 _parse_integer_fixup_radix(str
, &base
);
3134 while (next
- str
> field_width
) {
3136 val
.s
= div_s64(val
.s
, base
);
3138 val
.u
= div_u64(val
.u
, base
);
3143 switch (qualifier
) {
3144 case 'H': /* that's 'hh' in format */
3146 *va_arg(args
, signed char *) = val
.s
;
3148 *va_arg(args
, unsigned char *) = val
.u
;
3152 *va_arg(args
, short *) = val
.s
;
3154 *va_arg(args
, unsigned short *) = val
.u
;
3158 *va_arg(args
, long *) = val
.s
;
3160 *va_arg(args
, unsigned long *) = val
.u
;
3164 *va_arg(args
, long long *) = val
.s
;
3166 *va_arg(args
, unsigned long long *) = val
.u
;
3169 *va_arg(args
, size_t *) = val
.u
;
3173 *va_arg(args
, int *) = val
.s
;
3175 *va_arg(args
, unsigned int *) = val
.u
;
3187 EXPORT_SYMBOL(vsscanf
);
3190 * sscanf - Unformat a buffer into a list of arguments
3191 * @buf: input buffer
3192 * @fmt: formatting of buffer
3193 * @...: resulting arguments
3195 int sscanf(const char *buf
, const char *fmt
, ...)
3200 va_start(args
, fmt
);
3201 i
= vsscanf(buf
, fmt
, args
);
3206 EXPORT_SYMBOL(sscanf
);