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/build_bug.h>
21 #include <linux/clk.h>
22 #include <linux/clk-provider.h>
23 #include <linux/module.h> /* for KSYM_SYMBOL_LEN */
24 #include <linux/types.h>
25 #include <linux/string.h>
26 #include <linux/ctype.h>
27 #include <linux/kernel.h>
28 #include <linux/kallsyms.h>
29 #include <linux/math64.h>
30 #include <linux/uaccess.h>
31 #include <linux/ioport.h>
32 #include <linux/dcache.h>
33 #include <linux/cred.h>
34 #include <linux/rtc.h>
35 #include <linux/uuid.h>
37 #include <net/addrconf.h>
38 #include <linux/siphash.h>
39 #include <linux/compiler.h>
41 #include <linux/blkdev.h>
44 #include "../mm/internal.h" /* For the trace_print_flags arrays */
46 #include <asm/page.h> /* for PAGE_SIZE */
47 #include <asm/byteorder.h> /* cpu_to_le16 */
49 #include <linux/string_helpers.h>
53 * simple_strtoull - convert a string to an unsigned long long
54 * @cp: The start of the string
55 * @endp: A pointer to the end of the parsed string will be placed here
56 * @base: The number base to use
58 * This function is obsolete. Please use kstrtoull instead.
60 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
62 unsigned long long result;
65 cp = _parse_integer_fixup_radix(cp, &base);
66 rv = _parse_integer(cp, base, &result);
68 cp += (rv & ~KSTRTOX_OVERFLOW);
75 EXPORT_SYMBOL(simple_strtoull);
78 * simple_strtoul - convert a string to an unsigned long
79 * @cp: The start of the string
80 * @endp: A pointer to the end of the parsed string will be placed here
81 * @base: The number base to use
83 * This function is obsolete. Please use kstrtoul instead.
85 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
87 return simple_strtoull(cp, endp, base);
89 EXPORT_SYMBOL(simple_strtoul);
92 * simple_strtol - convert a string to a signed long
93 * @cp: The start of the string
94 * @endp: A pointer to the end of the parsed string will be placed here
95 * @base: The number base to use
97 * This function is obsolete. Please use kstrtol instead.
99 long simple_strtol(const char *cp, char **endp, unsigned int base)
102 return -simple_strtoul(cp + 1, endp, base);
104 return simple_strtoul(cp, endp, base);
106 EXPORT_SYMBOL(simple_strtol);
109 * simple_strtoll - convert a string to a signed long long
110 * @cp: The start of the string
111 * @endp: A pointer to the end of the parsed string will be placed here
112 * @base: The number base to use
114 * This function is obsolete. Please use kstrtoll instead.
116 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
119 return -simple_strtoull(cp + 1, endp, base);
121 return simple_strtoull(cp, endp, base);
123 EXPORT_SYMBOL(simple_strtoll);
125 static noinline_for_stack
126 int skip_atoi(const char **s)
131 i = i*10 + *((*s)++) - '0';
132 } while (isdigit(**s));
138 * Decimal conversion is by far the most typical, and is used for
139 * /proc and /sys data. This directly impacts e.g. top performance
140 * with many processes running. We optimize it for speed by emitting
141 * two characters at a time, using a 200 byte lookup table. This
142 * roughly halves the number of multiplications compared to computing
143 * the digits one at a time. Implementation strongly inspired by the
144 * previous version, which in turn used ideas described at
145 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
146 * from the author, Douglas W. Jones).
148 * It turns out there is precisely one 26 bit fixed-point
149 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
150 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
151 * range happens to be somewhat larger (x <= 1073741898), but that's
152 * irrelevant for our purpose.
154 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
155 * need a 32x32->64 bit multiply, so we simply use the same constant.
157 * For dividing a number in the range [100, 10^4-1] by 100, there are
158 * several options. The simplest is (x * 0x147b) >> 19, which is valid
159 * for all x <= 43698.
162 static const u16 decpair[100] = {
163 #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
164 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
165 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
166 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
167 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
168 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
169 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
170 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
171 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
172 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
173 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
178 * This will print a single '0' even if r == 0, since we would
179 * immediately jump to out_r where two 0s would be written but only
180 * one of them accounted for in buf. This is needed by ip4_string
181 * below. All other callers pass a non-zero value of r.
183 static noinline_for_stack
184 char *put_dec_trunc8(char *buf, unsigned r)
192 /* 100 <= r < 10^8 */
193 q = (r * (u64)0x28f5c29) >> 32;
194 *((u16 *)buf) = decpair[r - 100*q];
201 /* 100 <= q < 10^6 */
202 r = (q * (u64)0x28f5c29) >> 32;
203 *((u16 *)buf) = decpair[q - 100*r];
210 /* 100 <= r < 10^4 */
211 q = (r * 0x147b) >> 19;
212 *((u16 *)buf) = decpair[r - 100*q];
219 *((u16 *)buf) = decpair[r];
220 buf += r < 10 ? 1 : 2;
224 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
225 static noinline_for_stack
226 char *put_dec_full8(char *buf, unsigned r)
231 q = (r * (u64)0x28f5c29) >> 32;
232 *((u16 *)buf) = decpair[r - 100*q];
236 r = (q * (u64)0x28f5c29) >> 32;
237 *((u16 *)buf) = decpair[q - 100*r];
241 q = (r * 0x147b) >> 19;
242 *((u16 *)buf) = decpair[r - 100*q];
246 *((u16 *)buf) = decpair[q];
251 static noinline_for_stack
252 char *put_dec(char *buf, unsigned long long n)
254 if (n >= 100*1000*1000)
255 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
256 /* 1 <= n <= 1.6e11 */
257 if (n >= 100*1000*1000)
258 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
260 return put_dec_trunc8(buf, n);
263 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
266 put_dec_full4(char *buf, unsigned r)
271 q = (r * 0x147b) >> 19;
272 *((u16 *)buf) = decpair[r - 100*q];
275 *((u16 *)buf) = decpair[q];
279 * Call put_dec_full4 on x % 10000, return x / 10000.
280 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
281 * holds for all x < 1,128,869,999. The largest value this
282 * helper will ever be asked to convert is 1,125,520,955.
283 * (second call in the put_dec code, assuming n is all-ones).
285 static noinline_for_stack
286 unsigned put_dec_helper4(char *buf, unsigned x)
288 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
290 put_dec_full4(buf, x - q * 10000);
294 /* Based on code by Douglas W. Jones found at
295 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
296 * (with permission from the author).
297 * Performs no 64-bit division and hence should be fast on 32-bit machines.
300 char *put_dec(char *buf, unsigned long long n)
302 uint32_t d3, d2, d1, q, h;
304 if (n < 100*1000*1000)
305 return put_dec_trunc8(buf, n);
307 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
310 d3 = (h >> 16); /* implicit "& 0xffff" */
312 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
313 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
314 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
315 q = put_dec_helper4(buf, q);
317 q += 7671 * d3 + 9496 * d2 + 6 * d1;
318 q = put_dec_helper4(buf+4, q);
320 q += 4749 * d3 + 42 * d2;
321 q = put_dec_helper4(buf+8, q);
326 buf = put_dec_trunc8(buf, q);
327 else while (buf[-1] == '0')
336 * Convert passed number to decimal string.
337 * Returns the length of string. On buffer overflow, returns 0.
339 * If speed is not important, use snprintf(). It's easy to read the code.
341 int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
343 /* put_dec requires 2-byte alignment of the buffer. */
344 char tmp[sizeof(num) * 3] __aligned(2);
347 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
352 len = put_dec(tmp, num) - tmp;
355 if (len > size || width > size)
360 for (idx = 0; idx < width; idx++)
366 for (idx = 0; idx < len; ++idx)
367 buf[idx + width] = tmp[len - idx - 1];
372 #define SIGN 1 /* unsigned/signed, must be 1 */
373 #define LEFT 2 /* left justified */
374 #define PLUS 4 /* show plus */
375 #define SPACE 8 /* space if plus */
376 #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
377 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
378 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
381 FORMAT_TYPE_NONE, /* Just a string part */
383 FORMAT_TYPE_PRECISION,
387 FORMAT_TYPE_PERCENT_CHAR,
389 FORMAT_TYPE_LONG_LONG,
403 unsigned int type:8; /* format_type enum */
404 signed int field_width:24; /* width of output field */
405 unsigned int flags:8; /* flags to number() */
406 unsigned int base:8; /* number base, 8, 10 or 16 only */
407 signed int precision:16; /* # of digits/chars */
409 static_assert(sizeof(struct printf_spec) == 8);
411 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
412 #define PRECISION_MAX ((1 << 15) - 1)
414 static noinline_for_stack
415 char *number(char *buf, char *end, unsigned long long num,
416 struct printf_spec spec)
418 /* put_dec requires 2-byte alignment of the buffer. */
419 char tmp[3 * sizeof(num)] __aligned(2);
422 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
424 bool is_zero = num == 0LL;
425 int field_width = spec.field_width;
426 int precision = spec.precision;
428 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
429 * produces same digits or (maybe lowercased) letters */
430 locase = (spec.flags & SMALL);
431 if (spec.flags & LEFT)
432 spec.flags &= ~ZEROPAD;
434 if (spec.flags & SIGN) {
435 if ((signed long long)num < 0) {
437 num = -(signed long long)num;
439 } else if (spec.flags & PLUS) {
442 } else if (spec.flags & SPACE) {
454 /* generate full string in tmp[], in reverse order */
457 tmp[i++] = hex_asc_upper[num] | locase;
458 else if (spec.base != 10) { /* 8 or 16 */
459 int mask = spec.base - 1;
465 tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
468 } else { /* base 10 */
469 i = put_dec(tmp, num) - tmp;
472 /* printing 100 using %2d gives "100", not "00" */
475 /* leading space padding */
476 field_width -= precision;
477 if (!(spec.flags & (ZEROPAD | LEFT))) {
478 while (--field_width >= 0) {
490 /* "0x" / "0" prefix */
492 if (spec.base == 16 || !is_zero) {
497 if (spec.base == 16) {
499 *buf = ('X' | locase);
503 /* zero or space padding */
504 if (!(spec.flags & LEFT)) {
505 char c = ' ' + (spec.flags & ZEROPAD);
506 BUILD_BUG_ON(' ' + ZEROPAD != '0');
507 while (--field_width >= 0) {
513 /* hmm even more zero padding? */
514 while (i <= --precision) {
519 /* actual digits of result */
525 /* trailing space padding */
526 while (--field_width >= 0) {
535 static noinline_for_stack
536 char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
538 struct printf_spec spec;
540 spec.type = FORMAT_TYPE_PTR;
541 spec.field_width = 2 + 2 * size; /* 0x + hex */
542 spec.flags = SPECIAL | SMALL | ZEROPAD;
546 return number(buf, end, num, spec);
549 static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
552 if (buf >= end) /* nowhere to put anything */
555 if (size <= spaces) {
556 memset(buf, ' ', size);
560 if (len > size - spaces)
562 memmove(buf + spaces, buf, len);
564 memset(buf, ' ', spaces);
568 * Handle field width padding for a string.
569 * @buf: current buffer position
570 * @n: length of string
571 * @end: end of output buffer
572 * @spec: for field width and flags
573 * Returns: new buffer position after padding.
575 static noinline_for_stack
576 char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
580 if (likely(n >= spec.field_width))
582 /* we want to pad the sucker */
583 spaces = spec.field_width - n;
584 if (!(spec.flags & LEFT)) {
585 move_right(buf - n, end, n, spaces);
596 /* Handle string from a well known address. */
597 static char *string_nocheck(char *buf, char *end, const char *s,
598 struct printf_spec spec)
601 size_t lim = spec.precision;
612 return widen_string(buf, len, end, spec);
615 static noinline_for_stack
616 char *string(char *buf, char *end, const char *s,
617 struct printf_spec spec)
619 if ((unsigned long)s < PAGE_SIZE)
622 return string_nocheck(buf, end, s, spec);
625 char *pointer_string(char *buf, char *end, const void *ptr,
626 struct printf_spec spec)
630 if (spec.field_width == -1) {
631 spec.field_width = 2 * sizeof(ptr);
632 spec.flags |= ZEROPAD;
635 return number(buf, end, (unsigned long int)ptr, spec);
638 /* Make pointers available for printing early in the boot sequence. */
639 static int debug_boot_weak_hash __ro_after_init;
641 static int __init debug_boot_weak_hash_enable(char *str)
643 debug_boot_weak_hash = 1;
644 pr_info("debug_boot_weak_hash enabled\n");
647 early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
649 static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
650 static siphash_key_t ptr_key __read_mostly;
652 static void enable_ptr_key_workfn(struct work_struct *work)
654 get_random_bytes(&ptr_key, sizeof(ptr_key));
655 /* Needs to run from preemptible context */
656 static_branch_disable(¬_filled_random_ptr_key);
659 static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
661 static void fill_random_ptr_key(struct random_ready_callback *unused)
663 /* This may be in an interrupt handler. */
664 queue_work(system_unbound_wq, &enable_ptr_key_work);
667 static struct random_ready_callback random_ready = {
668 .func = fill_random_ptr_key
671 static int __init initialize_ptr_random(void)
673 int key_size = sizeof(ptr_key);
676 /* Use hw RNG if available. */
677 if (get_random_bytes_arch(&ptr_key, key_size) == key_size) {
678 static_branch_disable(¬_filled_random_ptr_key);
682 ret = add_random_ready_callback(&random_ready);
685 } else if (ret == -EALREADY) {
686 /* This is in preemptible context */
687 enable_ptr_key_workfn(&enable_ptr_key_work);
693 early_initcall(initialize_ptr_random);
695 /* Maps a pointer to a 32 bit unique identifier. */
696 static char *ptr_to_id(char *buf, char *end, const void *ptr,
697 struct printf_spec spec)
699 const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
700 unsigned long hashval;
702 /* When debugging early boot use non-cryptographically secure hash. */
703 if (unlikely(debug_boot_weak_hash)) {
704 hashval = hash_long((unsigned long)ptr, 32);
705 return pointer_string(buf, end, (const void *)hashval, spec);
708 if (static_branch_unlikely(¬_filled_random_ptr_key)) {
709 spec.field_width = 2 * sizeof(ptr);
710 /* string length must be less than default_width */
711 return string_nocheck(buf, end, str, spec);
715 hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
717 * Mask off the first 32 bits, this makes explicit that we have
718 * modified the address (and 32 bits is plenty for a unique ID).
720 hashval = hashval & 0xffffffff;
722 hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
724 return pointer_string(buf, end, (const void *)hashval, spec);
727 int kptr_restrict __read_mostly;
729 static noinline_for_stack
730 char *restricted_pointer(char *buf, char *end, const void *ptr,
731 struct printf_spec spec)
733 switch (kptr_restrict) {
735 /* Handle as %p, hash and do _not_ leak addresses. */
736 return ptr_to_id(buf, end, ptr, spec);
738 const struct cred *cred;
741 * kptr_restrict==1 cannot be used in IRQ context
742 * because its test for CAP_SYSLOG would be meaningless.
744 if (in_irq() || in_serving_softirq() || in_nmi()) {
745 if (spec.field_width == -1)
746 spec.field_width = 2 * sizeof(ptr);
747 return string_nocheck(buf, end, "pK-error", spec);
751 * Only print the real pointer value if the current
752 * process has CAP_SYSLOG and is running with the
753 * same credentials it started with. This is because
754 * access to files is checked at open() time, but %pK
755 * checks permission at read() time. We don't want to
756 * leak pointer values if a binary opens a file using
757 * %pK and then elevates privileges before reading it.
759 cred = current_cred();
760 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
761 !uid_eq(cred->euid, cred->uid) ||
762 !gid_eq(cred->egid, cred->gid))
768 /* Always print 0's for %pK */
773 return pointer_string(buf, end, ptr, spec);
776 static noinline_for_stack
777 char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
780 const char *array[4], *s;
781 const struct dentry *p;
786 case '2': case '3': case '4':
787 depth = fmt[1] - '0';
794 for (i = 0; i < depth; i++, d = p) {
795 p = READ_ONCE(d->d_parent);
796 array[i] = READ_ONCE(d->d_name.name);
805 for (n = 0; n != spec.precision; n++, buf++) {
817 return widen_string(buf, n, end, spec);
821 static noinline_for_stack
822 char *bdev_name(char *buf, char *end, struct block_device *bdev,
823 struct printf_spec spec, const char *fmt)
825 struct gendisk *hd = bdev->bd_disk;
827 buf = string(buf, end, hd->disk_name, spec);
828 if (bdev->bd_part->partno) {
829 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
834 buf = number(buf, end, bdev->bd_part->partno, spec);
840 static noinline_for_stack
841 char *symbol_string(char *buf, char *end, void *ptr,
842 struct printf_spec spec, const char *fmt)
845 #ifdef CONFIG_KALLSYMS
846 char sym[KSYM_SYMBOL_LEN];
850 ptr = __builtin_extract_return_addr(ptr);
851 value = (unsigned long)ptr;
853 #ifdef CONFIG_KALLSYMS
855 sprint_backtrace(sym, value);
856 else if (*fmt != 'f' && *fmt != 's')
857 sprint_symbol(sym, value);
859 sprint_symbol_no_offset(sym, value);
861 return string_nocheck(buf, end, sym, spec);
863 return special_hex_number(buf, end, value, sizeof(void *));
867 static const struct printf_spec default_str_spec = {
872 static const struct printf_spec default_flag_spec = {
875 .flags = SPECIAL | SMALL,
878 static const struct printf_spec default_dec_spec = {
883 static const struct printf_spec default_dec02_spec = {
890 static const struct printf_spec default_dec04_spec = {
897 static noinline_for_stack
898 char *resource_string(char *buf, char *end, struct resource *res,
899 struct printf_spec spec, const char *fmt)
901 #ifndef IO_RSRC_PRINTK_SIZE
902 #define IO_RSRC_PRINTK_SIZE 6
905 #ifndef MEM_RSRC_PRINTK_SIZE
906 #define MEM_RSRC_PRINTK_SIZE 10
908 static const struct printf_spec io_spec = {
910 .field_width = IO_RSRC_PRINTK_SIZE,
912 .flags = SPECIAL | SMALL | ZEROPAD,
914 static const struct printf_spec mem_spec = {
916 .field_width = MEM_RSRC_PRINTK_SIZE,
918 .flags = SPECIAL | SMALL | ZEROPAD,
920 static const struct printf_spec bus_spec = {
924 .flags = SMALL | ZEROPAD,
926 static const struct printf_spec str_spec = {
932 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
933 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
934 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
935 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
936 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
937 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
938 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
939 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
941 char *p = sym, *pend = sym + sizeof(sym);
942 int decode = (fmt[0] == 'R') ? 1 : 0;
943 const struct printf_spec *specp;
946 if (res->flags & IORESOURCE_IO) {
947 p = string_nocheck(p, pend, "io ", str_spec);
949 } else if (res->flags & IORESOURCE_MEM) {
950 p = string_nocheck(p, pend, "mem ", str_spec);
952 } else if (res->flags & IORESOURCE_IRQ) {
953 p = string_nocheck(p, pend, "irq ", str_spec);
954 specp = &default_dec_spec;
955 } else if (res->flags & IORESOURCE_DMA) {
956 p = string_nocheck(p, pend, "dma ", str_spec);
957 specp = &default_dec_spec;
958 } else if (res->flags & IORESOURCE_BUS) {
959 p = string_nocheck(p, pend, "bus ", str_spec);
962 p = string_nocheck(p, pend, "??? ", str_spec);
966 if (decode && res->flags & IORESOURCE_UNSET) {
967 p = string_nocheck(p, pend, "size ", str_spec);
968 p = number(p, pend, resource_size(res), *specp);
970 p = number(p, pend, res->start, *specp);
971 if (res->start != res->end) {
973 p = number(p, pend, res->end, *specp);
977 if (res->flags & IORESOURCE_MEM_64)
978 p = string_nocheck(p, pend, " 64bit", str_spec);
979 if (res->flags & IORESOURCE_PREFETCH)
980 p = string_nocheck(p, pend, " pref", str_spec);
981 if (res->flags & IORESOURCE_WINDOW)
982 p = string_nocheck(p, pend, " window", str_spec);
983 if (res->flags & IORESOURCE_DISABLED)
984 p = string_nocheck(p, pend, " disabled", str_spec);
986 p = string_nocheck(p, pend, " flags ", str_spec);
987 p = number(p, pend, res->flags, default_flag_spec);
992 return string_nocheck(buf, end, sym, spec);
995 static noinline_for_stack
996 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
999 int i, len = 1; /* if we pass '%ph[CDN]', field width remains
1000 negative value, fallback to the default */
1003 if (spec.field_width == 0)
1004 /* nothing to print */
1007 if (ZERO_OR_NULL_PTR(addr))
1009 return string(buf, end, NULL, spec);
1026 if (spec.field_width > 0)
1027 len = min_t(int, spec.field_width, 64);
1029 for (i = 0; i < len; ++i) {
1031 *buf = hex_asc_hi(addr[i]);
1034 *buf = hex_asc_lo(addr[i]);
1037 if (separator && i != len - 1) {
1047 static noinline_for_stack
1048 char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
1049 struct printf_spec spec, const char *fmt)
1051 const int CHUNKSZ = 32;
1052 int nr_bits = max_t(int, spec.field_width, 0);
1056 /* reused to print numbers */
1057 spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
1059 chunksz = nr_bits & (CHUNKSZ - 1);
1063 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
1064 for (; i >= 0; i -= CHUNKSZ) {
1068 chunkmask = ((1ULL << chunksz) - 1);
1069 word = i / BITS_PER_LONG;
1070 bit = i % BITS_PER_LONG;
1071 val = (bitmap[word] >> bit) & chunkmask;
1080 spec.field_width = DIV_ROUND_UP(chunksz, 4);
1081 buf = number(buf, end, val, spec);
1088 static noinline_for_stack
1089 char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
1090 struct printf_spec spec, const char *fmt)
1092 int nr_bits = max_t(int, spec.field_width, 0);
1093 /* current bit is 'cur', most recently seen range is [rbot, rtop] */
1094 int cur, rbot, rtop;
1097 rbot = cur = find_first_bit(bitmap, nr_bits);
1098 while (cur < nr_bits) {
1100 cur = find_next_bit(bitmap, nr_bits, cur + 1);
1101 if (cur < nr_bits && cur <= rtop + 1)
1111 buf = number(buf, end, rbot, default_dec_spec);
1117 buf = number(buf, end, rtop, default_dec_spec);
1125 static noinline_for_stack
1126 char *mac_address_string(char *buf, char *end, u8 *addr,
1127 struct printf_spec spec, const char *fmt)
1129 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
1133 bool reversed = false;
1149 for (i = 0; i < 6; i++) {
1151 p = hex_byte_pack(p, addr[5 - i]);
1153 p = hex_byte_pack(p, addr[i]);
1155 if (fmt[0] == 'M' && i != 5)
1160 return string_nocheck(buf, end, mac_addr, spec);
1163 static noinline_for_stack
1164 char *ip4_string(char *p, const u8 *addr, const char *fmt)
1167 bool leading_zeros = (fmt[0] == 'i');
1192 for (i = 0; i < 4; i++) {
1193 char temp[4] __aligned(2); /* hold each IP quad in reverse order */
1194 int digits = put_dec_trunc8(temp, addr[index]) - temp;
1195 if (leading_zeros) {
1201 /* reverse the digits in the quad */
1203 *p++ = temp[digits];
1213 static noinline_for_stack
1214 char *ip6_compressed_string(char *p, const char *addr)
1217 unsigned char zerolength[8];
1222 bool needcolon = false;
1224 struct in6_addr in6;
1226 memcpy(&in6, addr, sizeof(struct in6_addr));
1228 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
1230 memset(zerolength, 0, sizeof(zerolength));
1237 /* find position of longest 0 run */
1238 for (i = 0; i < range; i++) {
1239 for (j = i; j < range; j++) {
1240 if (in6.s6_addr16[j] != 0)
1245 for (i = 0; i < range; i++) {
1246 if (zerolength[i] > longest) {
1247 longest = zerolength[i];
1251 if (longest == 1) /* don't compress a single 0 */
1255 for (i = 0; i < range; i++) {
1256 if (i == colonpos) {
1257 if (needcolon || i == 0)
1268 /* hex u16 without leading 0s */
1269 word = ntohs(in6.s6_addr16[i]);
1274 p = hex_byte_pack(p, hi);
1276 *p++ = hex_asc_lo(hi);
1277 p = hex_byte_pack(p, lo);
1280 p = hex_byte_pack(p, lo);
1282 *p++ = hex_asc_lo(lo);
1289 p = ip4_string(p, &in6.s6_addr[12], "I4");
1296 static noinline_for_stack
1297 char *ip6_string(char *p, const char *addr, const char *fmt)
1301 for (i = 0; i < 8; i++) {
1302 p = hex_byte_pack(p, *addr++);
1303 p = hex_byte_pack(p, *addr++);
1304 if (fmt[0] == 'I' && i != 7)
1312 static noinline_for_stack
1313 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
1314 struct printf_spec spec, const char *fmt)
1316 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1318 if (fmt[0] == 'I' && fmt[2] == 'c')
1319 ip6_compressed_string(ip6_addr, addr);
1321 ip6_string(ip6_addr, addr, fmt);
1323 return string_nocheck(buf, end, ip6_addr, spec);
1326 static noinline_for_stack
1327 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
1328 struct printf_spec spec, const char *fmt)
1330 char ip4_addr[sizeof("255.255.255.255")];
1332 ip4_string(ip4_addr, addr, fmt);
1334 return string_nocheck(buf, end, ip4_addr, spec);
1337 static noinline_for_stack
1338 char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1339 struct printf_spec spec, const char *fmt)
1341 bool have_p = false, have_s = false, have_f = false, have_c = false;
1342 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1343 sizeof(":12345") + sizeof("/123456789") +
1344 sizeof("%1234567890")];
1345 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1346 const u8 *addr = (const u8 *) &sa->sin6_addr;
1347 char fmt6[2] = { fmt[0], '6' };
1351 while (isalpha(*++fmt)) {
1368 if (have_p || have_s || have_f) {
1373 if (fmt6[0] == 'I' && have_c)
1374 p = ip6_compressed_string(ip6_addr + off, addr);
1376 p = ip6_string(ip6_addr + off, addr, fmt6);
1378 if (have_p || have_s || have_f)
1383 p = number(p, pend, ntohs(sa->sin6_port), spec);
1387 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1388 IPV6_FLOWINFO_MASK), spec);
1392 p = number(p, pend, sa->sin6_scope_id, spec);
1396 return string_nocheck(buf, end, ip6_addr, spec);
1399 static noinline_for_stack
1400 char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1401 struct printf_spec spec, const char *fmt)
1403 bool have_p = false;
1404 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1405 char *pend = ip4_addr + sizeof(ip4_addr);
1406 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1407 char fmt4[3] = { fmt[0], '4', 0 };
1410 while (isalpha(*++fmt)) {
1424 p = ip4_string(ip4_addr, addr, fmt4);
1427 p = number(p, pend, ntohs(sa->sin_port), spec);
1431 return string_nocheck(buf, end, ip4_addr, spec);
1434 static noinline_for_stack
1435 char *ip_addr_string(char *buf, char *end, const void *ptr,
1436 struct printf_spec spec, const char *fmt)
1440 return ip6_addr_string(buf, end, ptr, spec, fmt);
1442 return ip4_addr_string(buf, end, ptr, spec, fmt);
1445 struct sockaddr raw;
1446 struct sockaddr_in v4;
1447 struct sockaddr_in6 v6;
1450 switch (sa->raw.sa_family) {
1452 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1454 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1456 return string_nocheck(buf, end, "(invalid address)", spec);
1460 return ptr_to_id(buf, end, ptr, spec);
1463 static noinline_for_stack
1464 char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1469 unsigned int flags = 0;
1472 if (spec.field_width == 0)
1473 return buf; /* nothing to print */
1475 if (ZERO_OR_NULL_PTR(addr))
1476 return string(buf, end, NULL, spec); /* NULL pointer */
1480 switch (fmt[count++]) {
1482 flags |= ESCAPE_ANY;
1485 flags |= ESCAPE_SPECIAL;
1488 flags |= ESCAPE_HEX;
1491 flags |= ESCAPE_NULL;
1494 flags |= ESCAPE_OCTAL;
1500 flags |= ESCAPE_SPACE;
1509 flags = ESCAPE_ANY_NP;
1511 len = spec.field_width < 0 ? 1 : spec.field_width;
1514 * string_escape_mem() writes as many characters as it can to
1515 * the given buffer, and returns the total size of the output
1516 * had the buffer been big enough.
1518 buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
1523 static char *va_format(char *buf, char *end, struct va_format *va_fmt)
1527 va_copy(va, *va_fmt->va);
1528 buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
1534 static noinline_for_stack
1535 char *uuid_string(char *buf, char *end, const u8 *addr,
1536 struct printf_spec spec, const char *fmt)
1538 char uuid[UUID_STRING_LEN + 1];
1541 const u8 *index = uuid_index;
1546 uc = true; /* fall-through */
1555 for (i = 0; i < 16; i++) {
1557 p = hex_byte_pack_upper(p, addr[index[i]]);
1559 p = hex_byte_pack(p, addr[index[i]]);
1572 return string_nocheck(buf, end, uuid, spec);
1575 static noinline_for_stack
1576 char *netdev_bits(char *buf, char *end, const void *addr,
1577 struct printf_spec spec, const char *fmt)
1579 unsigned long long num;
1584 num = *(const netdev_features_t *)addr;
1585 size = sizeof(netdev_features_t);
1588 return ptr_to_id(buf, end, addr, spec);
1591 return special_hex_number(buf, end, num, size);
1594 static noinline_for_stack
1595 char *address_val(char *buf, char *end, const void *addr, const char *fmt)
1597 unsigned long long num;
1602 num = *(const dma_addr_t *)addr;
1603 size = sizeof(dma_addr_t);
1607 num = *(const phys_addr_t *)addr;
1608 size = sizeof(phys_addr_t);
1612 return special_hex_number(buf, end, num, size);
1615 static noinline_for_stack
1616 char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1618 int year = tm->tm_year + (r ? 0 : 1900);
1619 int mon = tm->tm_mon + (r ? 0 : 1);
1621 buf = number(buf, end, year, default_dec04_spec);
1626 buf = number(buf, end, mon, default_dec02_spec);
1631 return number(buf, end, tm->tm_mday, default_dec02_spec);
1634 static noinline_for_stack
1635 char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1637 buf = number(buf, end, tm->tm_hour, default_dec02_spec);
1642 buf = number(buf, end, tm->tm_min, default_dec02_spec);
1647 return number(buf, end, tm->tm_sec, default_dec02_spec);
1650 static noinline_for_stack
1651 char *rtc_str(char *buf, char *end, const struct rtc_time *tm, const char *fmt)
1653 bool have_t = true, have_d = true;
1657 switch (fmt[count]) {
1668 raw = fmt[count] == 'r';
1671 buf = date_str(buf, end, tm, raw);
1672 if (have_d && have_t) {
1673 /* Respect ISO 8601 */
1679 buf = time_str(buf, end, tm, raw);
1684 static noinline_for_stack
1685 char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
1690 return rtc_str(buf, end, (const struct rtc_time *)ptr, fmt);
1692 return ptr_to_id(buf, end, ptr, spec);
1696 static noinline_for_stack
1697 char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
1700 if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk)
1701 return string(buf, end, NULL, spec);
1706 #ifdef CONFIG_COMMON_CLK
1707 return string(buf, end, __clk_get_name(clk), spec);
1709 return ptr_to_id(buf, end, clk, spec);
1715 char *format_flags(char *buf, char *end, unsigned long flags,
1716 const struct trace_print_flags *names)
1720 for ( ; flags && names->name; names++) {
1722 if ((flags & mask) != mask)
1725 buf = string(buf, end, names->name, default_str_spec);
1736 buf = number(buf, end, flags, default_flag_spec);
1741 static noinline_for_stack
1742 char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt)
1744 unsigned long flags;
1745 const struct trace_print_flags *names;
1749 flags = *(unsigned long *)flags_ptr;
1750 /* Remove zone id */
1751 flags &= (1UL << NR_PAGEFLAGS) - 1;
1752 names = pageflag_names;
1755 flags = *(unsigned long *)flags_ptr;
1756 names = vmaflag_names;
1759 flags = *(gfp_t *)flags_ptr;
1760 names = gfpflag_names;
1763 WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]);
1767 return format_flags(buf, end, flags, names);
1770 static const char *device_node_name_for_depth(const struct device_node *np, int depth)
1772 for ( ; np && depth; depth--)
1775 return kbasename(np->full_name);
1778 static noinline_for_stack
1779 char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end)
1782 const struct device_node *parent = np->parent;
1784 /* special case for root node */
1786 return string_nocheck(buf, end, "/", default_str_spec);
1788 for (depth = 0; parent->parent; depth++)
1789 parent = parent->parent;
1791 for ( ; depth >= 0; depth--) {
1792 buf = string_nocheck(buf, end, "/", default_str_spec);
1793 buf = string(buf, end, device_node_name_for_depth(np, depth),
1799 static noinline_for_stack
1800 char *device_node_string(char *buf, char *end, struct device_node *dn,
1801 struct printf_spec spec, const char *fmt)
1803 char tbuf[sizeof("xxxx") + 1];
1806 char *buf_start = buf;
1807 struct property *prop;
1808 bool has_mult, pass;
1809 static const struct printf_spec num_spec = {
1816 struct printf_spec str_spec = spec;
1817 str_spec.field_width = -1;
1819 if (!IS_ENABLED(CONFIG_OF))
1820 return string_nocheck(buf, end, "(!OF)", spec);
1822 if ((unsigned long)dn < PAGE_SIZE)
1823 return string_nocheck(buf, end, "(null)", spec);
1825 /* simple case without anything any more format specifiers */
1827 if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
1830 for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {
1839 case 'f': /* full_name */
1840 buf = device_node_gen_full_name(dn, buf, end);
1842 case 'n': /* name */
1843 p = kbasename(of_node_full_name(dn));
1844 precision = str_spec.precision;
1845 str_spec.precision = strchrnul(p, '@') - p;
1846 buf = string(buf, end, p, str_spec);
1847 str_spec.precision = precision;
1849 case 'p': /* phandle */
1850 buf = number(buf, end, (unsigned int)dn->phandle, num_spec);
1852 case 'P': /* path-spec */
1853 p = kbasename(of_node_full_name(dn));
1856 buf = string(buf, end, p, str_spec);
1858 case 'F': /* flags */
1859 tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
1860 tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
1861 tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
1862 tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
1864 buf = string_nocheck(buf, end, tbuf, str_spec);
1866 case 'c': /* major compatible string */
1867 ret = of_property_read_string(dn, "compatible", &p);
1869 buf = string(buf, end, p, str_spec);
1871 case 'C': /* full compatible string */
1873 of_property_for_each_string(dn, "compatible", prop, p) {
1875 buf = string_nocheck(buf, end, ",", str_spec);
1876 buf = string_nocheck(buf, end, "\"", str_spec);
1877 buf = string(buf, end, p, str_spec);
1878 buf = string_nocheck(buf, end, "\"", str_spec);
1888 return widen_string(buf, buf - buf_start, end, spec);
1891 static char *kobject_string(char *buf, char *end, void *ptr,
1892 struct printf_spec spec, const char *fmt)
1896 return device_node_string(buf, end, ptr, spec, fmt + 1);
1899 return ptr_to_id(buf, end, ptr, spec);
1903 * Show a '%p' thing. A kernel extension is that the '%p' is followed
1904 * by an extra set of alphanumeric characters that are extended format
1907 * Please update scripts/checkpatch.pl when adding/removing conversion
1908 * characters. (Search for "check for vsprintf extension").
1910 * Right now we handle:
1912 * - 'S' For symbolic direct pointers (or function descriptors) with offset
1913 * - 's' For symbolic direct pointers (or function descriptors) without offset
1916 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
1917 * - 'B' For backtraced symbolic direct pointers with offset
1918 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
1919 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
1920 * - 'b[l]' For a bitmap, the number of bits is determined by the field
1921 * width which must be explicitly specified either as part of the
1922 * format string '%32b[l]' or through '%*b[l]', [l] selects
1923 * range-list format instead of hex format
1924 * - 'M' For a 6-byte MAC address, it prints the address in the
1925 * usual colon-separated hex notation
1926 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
1927 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
1928 * with a dash-separated hex notation
1929 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
1930 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
1931 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
1932 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
1934 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1935 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1936 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
1937 * IPv6 omits the colons (01020304...0f)
1938 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
1940 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1941 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1942 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
1943 * - 'I[6S]c' for IPv6 addresses printed as specified by
1944 * http://tools.ietf.org/html/rfc5952
1945 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
1946 * of the following flags (see string_escape_mem() for the
1949 * c - ESCAPE_SPECIAL
1955 * By default ESCAPE_ANY_NP is used.
1956 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
1957 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
1958 * Options for %pU are:
1959 * b big endian lower case hex (default)
1960 * B big endian UPPER case hex
1961 * l little endian lower case hex
1962 * L little endian UPPER case hex
1963 * big endian output byte order is:
1964 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
1965 * little endian output byte order is:
1966 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
1967 * - 'V' For a struct va_format which contains a format string * and va_list *,
1968 * call vsnprintf(->format, *->va_list).
1969 * Implements a "recursive vsnprintf".
1970 * Do not use this feature without some mechanism to verify the
1971 * correctness of the format string and va_list arguments.
1972 * - 'K' For a kernel pointer that should be hidden from unprivileged users
1973 * - 'NF' For a netdev_features_t
1974 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
1975 * a certain separator (' ' by default):
1979 * The maximum supported length is 64 bytes of the input. Consider
1980 * to use print_hex_dump() for the larger input.
1981 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
1982 * (default assumed to be phys_addr_t, passed by reference)
1983 * - 'd[234]' For a dentry name (optionally 2-4 last components)
1984 * - 'D[234]' Same as 'd' but for a struct file
1985 * - 'g' For block_device name (gendisk + partition number)
1986 * - 't[R][dt][r]' For time and date as represented:
1988 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
1989 * (legacy clock framework) of the clock
1990 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
1991 * (legacy clock framework) of the clock
1992 * - 'G' For flags to be printed as a collection of symbolic strings that would
1993 * construct the specific value. Supported flags given by option:
1994 * p page flags (see struct page) given as pointer to unsigned long
1995 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
1996 * v vma flags (VM_*) given as pointer to unsigned long
1997 * - 'OF[fnpPcCF]' For a device tree object
1998 * Without any optional arguments prints the full_name
1999 * f device node full_name
2000 * n device node name
2001 * p device node phandle
2002 * P device node path spec (name + @unit)
2003 * F device node flags
2004 * c major compatible string
2005 * C full compatible string
2006 * - 'x' For printing the address. Equivalent to "%lx".
2008 * ** When making changes please also update:
2009 * Documentation/core-api/printk-formats.rst
2011 * Note: The default behaviour (unadorned %p) is to hash the address,
2012 * rendering it useful as a unique identifier.
2014 static noinline_for_stack
2015 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
2016 struct printf_spec spec)
2018 const int default_width = 2 * sizeof(void *);
2020 if (!ptr && *fmt != 'K' && *fmt != 'x') {
2022 * Print (null) with the same width as a pointer so it makes
2023 * tabular output look nice.
2025 if (spec.field_width == -1)
2026 spec.field_width = default_width;
2027 return string_nocheck(buf, end, "(null)", spec);
2035 ptr = dereference_symbol_descriptor(ptr);
2038 return symbol_string(buf, end, ptr, spec, fmt);
2041 return resource_string(buf, end, ptr, spec, fmt);
2043 return hex_string(buf, end, ptr, spec, fmt);
2047 return bitmap_list_string(buf, end, ptr, spec, fmt);
2049 return bitmap_string(buf, end, ptr, spec, fmt);
2051 case 'M': /* Colon separated: 00:01:02:03:04:05 */
2052 case 'm': /* Contiguous: 000102030405 */
2054 /* [mM]R (Reverse order; Bluetooth) */
2055 return mac_address_string(buf, end, ptr, spec, fmt);
2056 case 'I': /* Formatted IP supported
2058 * 6: 0001:0203:...:0708
2059 * 6c: 1::708 or 1::1.2.3.4
2061 case 'i': /* Contiguous:
2062 * 4: 001.002.003.004
2065 return ip_addr_string(buf, end, ptr, spec, fmt);
2067 return escaped_string(buf, end, ptr, spec, fmt);
2069 return uuid_string(buf, end, ptr, spec, fmt);
2071 return va_format(buf, end, ptr);
2073 return restricted_pointer(buf, end, ptr, spec);
2075 return netdev_bits(buf, end, ptr, spec, fmt);
2077 return address_val(buf, end, ptr, fmt);
2079 return dentry_name(buf, end, ptr, spec, fmt);
2081 return time_and_date(buf, end, ptr, spec, fmt);
2083 return clock(buf, end, ptr, spec, fmt);
2085 return dentry_name(buf, end,
2086 ((const struct file *)ptr)->f_path.dentry,
2090 return bdev_name(buf, end, ptr, spec, fmt);
2094 return flags_string(buf, end, ptr, fmt);
2096 return kobject_string(buf, end, ptr, spec, fmt);
2098 return pointer_string(buf, end, ptr, spec);
2101 /* default is to _not_ leak addresses, hash before printing */
2102 return ptr_to_id(buf, end, ptr, spec);
2106 * Helper function to decode printf style format.
2107 * Each call decode a token from the format and return the
2108 * number of characters read (or likely the delta where it wants
2109 * to go on the next call).
2110 * The decoded token is returned through the parameters
2112 * 'h', 'l', or 'L' for integer fields
2113 * 'z' support added 23/7/1999 S.H.
2114 * 'z' changed to 'Z' --davidm 1/25/99
2115 * 'Z' changed to 'z' --adobriyan 2017-01-25
2116 * 't' added for ptrdiff_t
2118 * @fmt: the format string
2119 * @type of the token returned
2120 * @flags: various flags such as +, -, # tokens..
2121 * @field_width: overwritten width
2122 * @base: base of the number (octal, hex, ...)
2123 * @precision: precision of a number
2124 * @qualifier: qualifier of a number (long, size_t, ...)
2126 static noinline_for_stack
2127 int format_decode(const char *fmt, struct printf_spec *spec)
2129 const char *start = fmt;
2132 /* we finished early by reading the field width */
2133 if (spec->type == FORMAT_TYPE_WIDTH) {
2134 if (spec->field_width < 0) {
2135 spec->field_width = -spec->field_width;
2136 spec->flags |= LEFT;
2138 spec->type = FORMAT_TYPE_NONE;
2142 /* we finished early by reading the precision */
2143 if (spec->type == FORMAT_TYPE_PRECISION) {
2144 if (spec->precision < 0)
2145 spec->precision = 0;
2147 spec->type = FORMAT_TYPE_NONE;
2152 spec->type = FORMAT_TYPE_NONE;
2154 for (; *fmt ; ++fmt) {
2159 /* Return the current non-format string */
2160 if (fmt != start || !*fmt)
2166 while (1) { /* this also skips first '%' */
2172 case '-': spec->flags |= LEFT; break;
2173 case '+': spec->flags |= PLUS; break;
2174 case ' ': spec->flags |= SPACE; break;
2175 case '#': spec->flags |= SPECIAL; break;
2176 case '0': spec->flags |= ZEROPAD; break;
2177 default: found = false;
2184 /* get field width */
2185 spec->field_width = -1;
2188 spec->field_width = skip_atoi(&fmt);
2189 else if (*fmt == '*') {
2190 /* it's the next argument */
2191 spec->type = FORMAT_TYPE_WIDTH;
2192 return ++fmt - start;
2196 /* get the precision */
2197 spec->precision = -1;
2200 if (isdigit(*fmt)) {
2201 spec->precision = skip_atoi(&fmt);
2202 if (spec->precision < 0)
2203 spec->precision = 0;
2204 } else if (*fmt == '*') {
2205 /* it's the next argument */
2206 spec->type = FORMAT_TYPE_PRECISION;
2207 return ++fmt - start;
2212 /* get the conversion qualifier */
2214 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2215 *fmt == 'z' || *fmt == 't') {
2217 if (unlikely(qualifier == *fmt)) {
2218 if (qualifier == 'l') {
2221 } else if (qualifier == 'h') {
2232 spec->type = FORMAT_TYPE_CHAR;
2233 return ++fmt - start;
2236 spec->type = FORMAT_TYPE_STR;
2237 return ++fmt - start;
2240 spec->type = FORMAT_TYPE_PTR;
2241 return ++fmt - start;
2244 spec->type = FORMAT_TYPE_PERCENT_CHAR;
2245 return ++fmt - start;
2247 /* integer number formats - set up the flags and "break" */
2253 spec->flags |= SMALL;
2262 spec->flags |= SIGN;
2268 * Since %n poses a greater security risk than
2269 * utility, treat it as any other invalid or
2270 * unsupported format specifier.
2275 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
2276 spec->type = FORMAT_TYPE_INVALID;
2280 if (qualifier == 'L')
2281 spec->type = FORMAT_TYPE_LONG_LONG;
2282 else if (qualifier == 'l') {
2283 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
2284 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
2285 } else if (qualifier == 'z') {
2286 spec->type = FORMAT_TYPE_SIZE_T;
2287 } else if (qualifier == 't') {
2288 spec->type = FORMAT_TYPE_PTRDIFF;
2289 } else if (qualifier == 'H') {
2290 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
2291 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
2292 } else if (qualifier == 'h') {
2293 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
2294 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
2296 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
2297 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
2300 return ++fmt - start;
2304 set_field_width(struct printf_spec *spec, int width)
2306 spec->field_width = width;
2307 if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
2308 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
2313 set_precision(struct printf_spec *spec, int prec)
2315 spec->precision = prec;
2316 if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
2317 spec->precision = clamp(prec, 0, PRECISION_MAX);
2322 * vsnprintf - Format a string and place it in a buffer
2323 * @buf: The buffer to place the result into
2324 * @size: The size of the buffer, including the trailing null space
2325 * @fmt: The format string to use
2326 * @args: Arguments for the format string
2328 * This function generally follows C99 vsnprintf, but has some
2329 * extensions and a few limitations:
2331 * - ``%n`` is unsupported
2332 * - ``%p*`` is handled by pointer()
2334 * See pointer() or Documentation/core-api/printk-formats.rst for more
2335 * extensive description.
2337 * **Please update the documentation in both places when making changes**
2339 * The return value is the number of characters which would
2340 * be generated for the given input, excluding the trailing
2341 * '\0', as per ISO C99. If you want to have the exact
2342 * number of characters written into @buf as return value
2343 * (not including the trailing '\0'), use vscnprintf(). If the
2344 * return is greater than or equal to @size, the resulting
2345 * string is truncated.
2347 * If you're not already dealing with a va_list consider using snprintf().
2349 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
2351 unsigned long long num;
2353 struct printf_spec spec = {0};
2355 /* Reject out-of-range values early. Large positive sizes are
2356 used for unknown buffer sizes. */
2357 if (WARN_ON_ONCE(size > INT_MAX))
2363 /* Make sure end is always >= buf */
2370 const char *old_fmt = fmt;
2371 int read = format_decode(fmt, &spec);
2375 switch (spec.type) {
2376 case FORMAT_TYPE_NONE: {
2379 if (copy > end - str)
2381 memcpy(str, old_fmt, copy);
2387 case FORMAT_TYPE_WIDTH:
2388 set_field_width(&spec, va_arg(args, int));
2391 case FORMAT_TYPE_PRECISION:
2392 set_precision(&spec, va_arg(args, int));
2395 case FORMAT_TYPE_CHAR: {
2398 if (!(spec.flags & LEFT)) {
2399 while (--spec.field_width > 0) {
2406 c = (unsigned char) va_arg(args, int);
2410 while (--spec.field_width > 0) {
2418 case FORMAT_TYPE_STR:
2419 str = string(str, end, va_arg(args, char *), spec);
2422 case FORMAT_TYPE_PTR:
2423 str = pointer(fmt, str, end, va_arg(args, void *),
2425 while (isalnum(*fmt))
2429 case FORMAT_TYPE_PERCENT_CHAR:
2435 case FORMAT_TYPE_INVALID:
2437 * Presumably the arguments passed gcc's type
2438 * checking, but there is no safe or sane way
2439 * for us to continue parsing the format and
2440 * fetching from the va_list; the remaining
2441 * specifiers and arguments would be out of
2447 switch (spec.type) {
2448 case FORMAT_TYPE_LONG_LONG:
2449 num = va_arg(args, long long);
2451 case FORMAT_TYPE_ULONG:
2452 num = va_arg(args, unsigned long);
2454 case FORMAT_TYPE_LONG:
2455 num = va_arg(args, long);
2457 case FORMAT_TYPE_SIZE_T:
2458 if (spec.flags & SIGN)
2459 num = va_arg(args, ssize_t);
2461 num = va_arg(args, size_t);
2463 case FORMAT_TYPE_PTRDIFF:
2464 num = va_arg(args, ptrdiff_t);
2466 case FORMAT_TYPE_UBYTE:
2467 num = (unsigned char) va_arg(args, int);
2469 case FORMAT_TYPE_BYTE:
2470 num = (signed char) va_arg(args, int);
2472 case FORMAT_TYPE_USHORT:
2473 num = (unsigned short) va_arg(args, int);
2475 case FORMAT_TYPE_SHORT:
2476 num = (short) va_arg(args, int);
2478 case FORMAT_TYPE_INT:
2479 num = (int) va_arg(args, int);
2482 num = va_arg(args, unsigned int);
2485 str = number(str, end, num, spec);
2497 /* the trailing null byte doesn't count towards the total */
2501 EXPORT_SYMBOL(vsnprintf);
2504 * vscnprintf - Format a string and place it in a buffer
2505 * @buf: The buffer to place the result into
2506 * @size: The size of the buffer, including the trailing null space
2507 * @fmt: The format string to use
2508 * @args: Arguments for the format string
2510 * The return value is the number of characters which have been written into
2511 * the @buf not including the trailing '\0'. If @size is == 0 the function
2514 * If you're not already dealing with a va_list consider using scnprintf().
2516 * See the vsnprintf() documentation for format string extensions over C99.
2518 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
2522 i = vsnprintf(buf, size, fmt, args);
2524 if (likely(i < size))
2530 EXPORT_SYMBOL(vscnprintf);
2533 * snprintf - Format a string and place it in a buffer
2534 * @buf: The buffer to place the result into
2535 * @size: The size of the buffer, including the trailing null space
2536 * @fmt: The format string to use
2537 * @...: Arguments for the format string
2539 * The return value is the number of characters which would be
2540 * generated for the given input, excluding the trailing null,
2541 * as per ISO C99. If the return is greater than or equal to
2542 * @size, the resulting string is truncated.
2544 * See the vsnprintf() documentation for format string extensions over C99.
2546 int snprintf(char *buf, size_t size, const char *fmt, ...)
2551 va_start(args, fmt);
2552 i = vsnprintf(buf, size, fmt, args);
2557 EXPORT_SYMBOL(snprintf);
2560 * scnprintf - Format a string and place it in a buffer
2561 * @buf: The buffer to place the result into
2562 * @size: The size of the buffer, including the trailing null space
2563 * @fmt: The format string to use
2564 * @...: Arguments for the format string
2566 * The return value is the number of characters written into @buf not including
2567 * the trailing '\0'. If @size is == 0 the function returns 0.
2570 int scnprintf(char *buf, size_t size, const char *fmt, ...)
2575 va_start(args, fmt);
2576 i = vscnprintf(buf, size, fmt, args);
2581 EXPORT_SYMBOL(scnprintf);
2584 * vsprintf - Format a string and place it in a buffer
2585 * @buf: The buffer to place the result into
2586 * @fmt: The format string to use
2587 * @args: Arguments for the format string
2589 * The function returns the number of characters written
2590 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
2593 * If you're not already dealing with a va_list consider using sprintf().
2595 * See the vsnprintf() documentation for format string extensions over C99.
2597 int vsprintf(char *buf, const char *fmt, va_list args)
2599 return vsnprintf(buf, INT_MAX, fmt, args);
2601 EXPORT_SYMBOL(vsprintf);
2604 * sprintf - Format a string and place it in a buffer
2605 * @buf: The buffer to place the result into
2606 * @fmt: The format string to use
2607 * @...: Arguments for the format string
2609 * The function returns the number of characters written
2610 * into @buf. Use snprintf() or scnprintf() in order to avoid
2613 * See the vsnprintf() documentation for format string extensions over C99.
2615 int sprintf(char *buf, const char *fmt, ...)
2620 va_start(args, fmt);
2621 i = vsnprintf(buf, INT_MAX, fmt, args);
2626 EXPORT_SYMBOL(sprintf);
2628 #ifdef CONFIG_BINARY_PRINTF
2631 * vbin_printf() - VA arguments to binary data
2632 * bstr_printf() - Binary data to text string
2636 * vbin_printf - Parse a format string and place args' binary value in a buffer
2637 * @bin_buf: The buffer to place args' binary value
2638 * @size: The size of the buffer(by words(32bits), not characters)
2639 * @fmt: The format string to use
2640 * @args: Arguments for the format string
2642 * The format follows C99 vsnprintf, except %n is ignored, and its argument
2645 * The return value is the number of words(32bits) which would be generated for
2649 * If the return value is greater than @size, the resulting bin_buf is NOT
2650 * valid for bstr_printf().
2652 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
2654 struct printf_spec spec = {0};
2658 str = (char *)bin_buf;
2659 end = (char *)(bin_buf + size);
2661 #define save_arg(type) \
2663 unsigned long long value; \
2664 if (sizeof(type) == 8) { \
2665 unsigned long long val8; \
2666 str = PTR_ALIGN(str, sizeof(u32)); \
2667 val8 = va_arg(args, unsigned long long); \
2668 if (str + sizeof(type) <= end) { \
2669 *(u32 *)str = *(u32 *)&val8; \
2670 *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \
2674 unsigned int val4; \
2675 str = PTR_ALIGN(str, sizeof(type)); \
2676 val4 = va_arg(args, int); \
2677 if (str + sizeof(type) <= end) \
2678 *(typeof(type) *)str = (type)(long)val4; \
2679 value = (unsigned long long)val4; \
2681 str += sizeof(type); \
2686 int read = format_decode(fmt, &spec);
2690 switch (spec.type) {
2691 case FORMAT_TYPE_NONE:
2692 case FORMAT_TYPE_PERCENT_CHAR:
2694 case FORMAT_TYPE_INVALID:
2697 case FORMAT_TYPE_WIDTH:
2698 case FORMAT_TYPE_PRECISION:
2699 width = (int)save_arg(int);
2700 /* Pointers may require the width */
2702 set_field_width(&spec, width);
2705 case FORMAT_TYPE_CHAR:
2709 case FORMAT_TYPE_STR: {
2710 const char *save_str = va_arg(args, char *);
2713 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
2714 || (unsigned long)save_str < PAGE_SIZE)
2715 save_str = "(null)";
2716 len = strlen(save_str) + 1;
2717 if (str + len < end)
2718 memcpy(str, save_str, len);
2723 case FORMAT_TYPE_PTR:
2724 /* Dereferenced pointers must be done now */
2726 /* Dereference of functions is still OK */
2736 if (!isalnum(*fmt)) {
2740 str = pointer(fmt, str, end, va_arg(args, void *),
2745 end[-1] = '\0'; /* Must be nul terminated */
2747 /* skip all alphanumeric pointer suffixes */
2748 while (isalnum(*fmt))
2753 switch (spec.type) {
2755 case FORMAT_TYPE_LONG_LONG:
2756 save_arg(long long);
2758 case FORMAT_TYPE_ULONG:
2759 case FORMAT_TYPE_LONG:
2760 save_arg(unsigned long);
2762 case FORMAT_TYPE_SIZE_T:
2765 case FORMAT_TYPE_PTRDIFF:
2766 save_arg(ptrdiff_t);
2768 case FORMAT_TYPE_UBYTE:
2769 case FORMAT_TYPE_BYTE:
2772 case FORMAT_TYPE_USHORT:
2773 case FORMAT_TYPE_SHORT:
2783 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
2786 EXPORT_SYMBOL_GPL(vbin_printf);
2789 * bstr_printf - Format a string from binary arguments and place it in a buffer
2790 * @buf: The buffer to place the result into
2791 * @size: The size of the buffer, including the trailing null space
2792 * @fmt: The format string to use
2793 * @bin_buf: Binary arguments for the format string
2795 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
2796 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
2797 * a binary buffer that generated by vbin_printf.
2799 * The format follows C99 vsnprintf, but has some extensions:
2800 * see vsnprintf comment for details.
2802 * The return value is the number of characters which would
2803 * be generated for the given input, excluding the trailing
2804 * '\0', as per ISO C99. If you want to have the exact
2805 * number of characters written into @buf as return value
2806 * (not including the trailing '\0'), use vscnprintf(). If the
2807 * return is greater than or equal to @size, the resulting
2808 * string is truncated.
2810 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
2812 struct printf_spec spec = {0};
2814 const char *args = (const char *)bin_buf;
2816 if (WARN_ON_ONCE(size > INT_MAX))
2822 #define get_arg(type) \
2824 typeof(type) value; \
2825 if (sizeof(type) == 8) { \
2826 args = PTR_ALIGN(args, sizeof(u32)); \
2827 *(u32 *)&value = *(u32 *)args; \
2828 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
2830 args = PTR_ALIGN(args, sizeof(type)); \
2831 value = *(typeof(type) *)args; \
2833 args += sizeof(type); \
2837 /* Make sure end is always >= buf */
2844 const char *old_fmt = fmt;
2845 int read = format_decode(fmt, &spec);
2849 switch (spec.type) {
2850 case FORMAT_TYPE_NONE: {
2853 if (copy > end - str)
2855 memcpy(str, old_fmt, copy);
2861 case FORMAT_TYPE_WIDTH:
2862 set_field_width(&spec, get_arg(int));
2865 case FORMAT_TYPE_PRECISION:
2866 set_precision(&spec, get_arg(int));
2869 case FORMAT_TYPE_CHAR: {
2872 if (!(spec.flags & LEFT)) {
2873 while (--spec.field_width > 0) {
2879 c = (unsigned char) get_arg(char);
2883 while (--spec.field_width > 0) {
2891 case FORMAT_TYPE_STR: {
2892 const char *str_arg = args;
2893 args += strlen(str_arg) + 1;
2894 str = string(str, end, (char *)str_arg, spec);
2898 case FORMAT_TYPE_PTR: {
2899 bool process = false;
2901 /* Non function dereferences were already done */
2912 if (!isalnum(*fmt)) {
2916 /* Pointer dereference was already processed */
2918 len = copy = strlen(args);
2919 if (copy > end - str)
2921 memcpy(str, args, copy);
2927 str = pointer(fmt, str, end, get_arg(void *), spec);
2929 while (isalnum(*fmt))
2934 case FORMAT_TYPE_PERCENT_CHAR:
2940 case FORMAT_TYPE_INVALID:
2944 unsigned long long num;
2946 switch (spec.type) {
2948 case FORMAT_TYPE_LONG_LONG:
2949 num = get_arg(long long);
2951 case FORMAT_TYPE_ULONG:
2952 case FORMAT_TYPE_LONG:
2953 num = get_arg(unsigned long);
2955 case FORMAT_TYPE_SIZE_T:
2956 num = get_arg(size_t);
2958 case FORMAT_TYPE_PTRDIFF:
2959 num = get_arg(ptrdiff_t);
2961 case FORMAT_TYPE_UBYTE:
2962 num = get_arg(unsigned char);
2964 case FORMAT_TYPE_BYTE:
2965 num = get_arg(signed char);
2967 case FORMAT_TYPE_USHORT:
2968 num = get_arg(unsigned short);
2970 case FORMAT_TYPE_SHORT:
2971 num = get_arg(short);
2973 case FORMAT_TYPE_UINT:
2974 num = get_arg(unsigned int);
2980 str = number(str, end, num, spec);
2982 } /* switch(spec.type) */
2995 /* the trailing null byte doesn't count towards the total */
2998 EXPORT_SYMBOL_GPL(bstr_printf);
3001 * bprintf - Parse a format string and place args' binary value in a buffer
3002 * @bin_buf: The buffer to place args' binary value
3003 * @size: The size of the buffer(by words(32bits), not characters)
3004 * @fmt: The format string to use
3005 * @...: Arguments for the format string
3007 * The function returns the number of words(u32) written
3010 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
3015 va_start(args, fmt);
3016 ret = vbin_printf(bin_buf, size, fmt, args);
3021 EXPORT_SYMBOL_GPL(bprintf);
3023 #endif /* CONFIG_BINARY_PRINTF */
3026 * vsscanf - Unformat a buffer into a list of arguments
3027 * @buf: input buffer
3028 * @fmt: format of buffer
3031 int vsscanf(const char *buf, const char *fmt, va_list args)
3033 const char *str = buf;
3041 unsigned long long u;
3047 /* skip any white space in format */
3048 /* white space in format matchs any amount of
3049 * white space, including none, in the input.
3051 if (isspace(*fmt)) {
3052 fmt = skip_spaces(++fmt);
3053 str = skip_spaces(str);
3056 /* anything that is not a conversion must match exactly */
3057 if (*fmt != '%' && *fmt) {
3058 if (*fmt++ != *str++)
3067 /* skip this conversion.
3068 * advance both strings to next white space
3073 while (!isspace(*fmt) && *fmt != '%' && *fmt) {
3074 /* '%*[' not yet supported, invalid format */
3079 while (!isspace(*str) && *str)
3084 /* get field width */
3086 if (isdigit(*fmt)) {
3087 field_width = skip_atoi(&fmt);
3088 if (field_width <= 0)
3092 /* get conversion qualifier */
3094 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
3097 if (unlikely(qualifier == *fmt)) {
3098 if (qualifier == 'h') {
3101 } else if (qualifier == 'l') {
3112 /* return number of characters read so far */
3113 *va_arg(args, int *) = str - buf;
3127 char *s = (char *)va_arg(args, char*);
3128 if (field_width == -1)
3132 } while (--field_width > 0 && *str);
3138 char *s = (char *)va_arg(args, char *);
3139 if (field_width == -1)
3140 field_width = SHRT_MAX;
3141 /* first, skip leading white space in buffer */
3142 str = skip_spaces(str);
3144 /* now copy until next white space */
3145 while (*str && !isspace(*str) && field_width--)
3152 * Warning: This implementation of the '[' conversion specifier
3153 * deviates from its glibc counterpart in the following ways:
3154 * (1) It does NOT support ranges i.e. '-' is NOT a special
3156 * (2) It cannot match the closing bracket ']' itself
3157 * (3) A field width is required
3158 * (4) '%*[' (discard matching input) is currently not supported
3161 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
3162 * buf1, buf2, buf3);
3168 char *s = (char *)va_arg(args, char *);
3169 DECLARE_BITMAP(set, 256) = {0};
3170 unsigned int len = 0;
3171 bool negate = (*fmt == '^');
3173 /* field width is required */
3174 if (field_width == -1)
3180 for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
3181 set_bit((u8)*fmt, set);
3183 /* no ']' or no character set found */
3189 bitmap_complement(set, set, 256);
3190 /* exclude null '\0' byte */
3194 /* match must be non-empty */
3195 if (!test_bit((u8)*str, set))
3198 while (test_bit((u8)*str, set) && field_width--)
3220 /* looking for '%' in str */
3225 /* invalid format; stop here */
3229 /* have some sort of integer conversion.
3230 * first, skip white space in buffer.
3232 str = skip_spaces(str);
3235 if (is_sign && digit == '-')
3239 || (base == 16 && !isxdigit(digit))
3240 || (base == 10 && !isdigit(digit))
3241 || (base == 8 && (!isdigit(digit) || digit > '7'))
3242 || (base == 0 && !isdigit(digit)))
3246 val.s = qualifier != 'L' ?
3247 simple_strtol(str, &next, base) :
3248 simple_strtoll(str, &next, base);
3250 val.u = qualifier != 'L' ?
3251 simple_strtoul(str, &next, base) :
3252 simple_strtoull(str, &next, base);
3254 if (field_width > 0 && next - str > field_width) {
3256 _parse_integer_fixup_radix(str, &base);
3257 while (next - str > field_width) {
3259 val.s = div_s64(val.s, base);
3261 val.u = div_u64(val.u, base);
3266 switch (qualifier) {
3267 case 'H': /* that's 'hh' in format */
3269 *va_arg(args, signed char *) = val.s;
3271 *va_arg(args, unsigned char *) = val.u;
3275 *va_arg(args, short *) = val.s;
3277 *va_arg(args, unsigned short *) = val.u;
3281 *va_arg(args, long *) = val.s;
3283 *va_arg(args, unsigned long *) = val.u;
3287 *va_arg(args, long long *) = val.s;
3289 *va_arg(args, unsigned long long *) = val.u;
3292 *va_arg(args, size_t *) = val.u;
3296 *va_arg(args, int *) = val.s;
3298 *va_arg(args, unsigned int *) = val.u;
3310 EXPORT_SYMBOL(vsscanf);
3313 * sscanf - Unformat a buffer into a list of arguments
3314 * @buf: input buffer
3315 * @fmt: formatting of buffer
3316 * @...: resulting arguments
3318 int sscanf(const char *buf, const char *fmt, ...)
3323 va_start(args, fmt);
3324 i = vsscanf(buf, fmt, args);
3329 EXPORT_SYMBOL(sscanf);