1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 1991, 1992 Linus Torvalds
8 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
10 * Wirzenius wrote this portably, Torvalds fucked it up :-)
14 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
15 * - changed to provide snprintf and vsnprintf functions
16 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
17 * - scnprintf and vscnprintf
21 #include <linux/build_bug.h>
22 #include <linux/clk.h>
23 #include <linux/clk-provider.h>
24 #include <linux/module.h> /* for KSYM_SYMBOL_LEN */
25 #include <linux/types.h>
26 #include <linux/string.h>
27 #include <linux/ctype.h>
28 #include <linux/kernel.h>
29 #include <linux/kallsyms.h>
30 #include <linux/math64.h>
31 #include <linux/uaccess.h>
32 #include <linux/ioport.h>
33 #include <linux/dcache.h>
34 #include <linux/cred.h>
35 #include <linux/rtc.h>
36 #include <linux/uuid.h>
38 #include <net/addrconf.h>
39 #include <linux/siphash.h>
40 #include <linux/compiler.h>
42 #include <linux/blkdev.h>
45 #include "../mm/internal.h" /* For the trace_print_flags arrays */
47 #include <asm/page.h> /* for PAGE_SIZE */
48 #include <asm/byteorder.h> /* cpu_to_le16 */
50 #include <linux/string_helpers.h>
54 * simple_strtoull - convert a string to an unsigned long long
55 * @cp: The start of the string
56 * @endp: A pointer to the end of the parsed string will be placed here
57 * @base: The number base to use
59 * This function is obsolete. Please use kstrtoull instead.
61 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
63 unsigned long long result;
66 cp = _parse_integer_fixup_radix(cp, &base);
67 rv = _parse_integer(cp, base, &result);
69 cp += (rv & ~KSTRTOX_OVERFLOW);
76 EXPORT_SYMBOL(simple_strtoull);
79 * simple_strtoul - convert a string to an unsigned long
80 * @cp: The start of the string
81 * @endp: A pointer to the end of the parsed string will be placed here
82 * @base: The number base to use
84 * This function is obsolete. Please use kstrtoul instead.
86 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
88 return simple_strtoull(cp, endp, base);
90 EXPORT_SYMBOL(simple_strtoul);
93 * simple_strtol - convert a string to a signed long
94 * @cp: The start of the string
95 * @endp: A pointer to the end of the parsed string will be placed here
96 * @base: The number base to use
98 * This function is obsolete. Please use kstrtol instead.
100 long simple_strtol(const char *cp, char **endp, unsigned int base)
103 return -simple_strtoul(cp + 1, endp, base);
105 return simple_strtoul(cp, endp, base);
107 EXPORT_SYMBOL(simple_strtol);
110 * simple_strtoll - convert a string to a signed long long
111 * @cp: The start of the string
112 * @endp: A pointer to the end of the parsed string will be placed here
113 * @base: The number base to use
115 * This function is obsolete. Please use kstrtoll instead.
117 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
120 return -simple_strtoull(cp + 1, endp, base);
122 return simple_strtoull(cp, endp, base);
124 EXPORT_SYMBOL(simple_strtoll);
126 static noinline_for_stack
127 int skip_atoi(const char **s)
132 i = i*10 + *((*s)++) - '0';
133 } while (isdigit(**s));
139 * Decimal conversion is by far the most typical, and is used for
140 * /proc and /sys data. This directly impacts e.g. top performance
141 * with many processes running. We optimize it for speed by emitting
142 * two characters at a time, using a 200 byte lookup table. This
143 * roughly halves the number of multiplications compared to computing
144 * the digits one at a time. Implementation strongly inspired by the
145 * previous version, which in turn used ideas described at
146 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
147 * from the author, Douglas W. Jones).
149 * It turns out there is precisely one 26 bit fixed-point
150 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
151 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
152 * range happens to be somewhat larger (x <= 1073741898), but that's
153 * irrelevant for our purpose.
155 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
156 * need a 32x32->64 bit multiply, so we simply use the same constant.
158 * For dividing a number in the range [100, 10^4-1] by 100, there are
159 * several options. The simplest is (x * 0x147b) >> 19, which is valid
160 * for all x <= 43698.
163 static const u16 decpair[100] = {
164 #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
165 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
166 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
167 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
168 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
169 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
170 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
171 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
172 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
173 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
174 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
179 * This will print a single '0' even if r == 0, since we would
180 * immediately jump to out_r where two 0s would be written but only
181 * one of them accounted for in buf. This is needed by ip4_string
182 * below. All other callers pass a non-zero value of r.
184 static noinline_for_stack
185 char *put_dec_trunc8(char *buf, unsigned r)
193 /* 100 <= r < 10^8 */
194 q = (r * (u64)0x28f5c29) >> 32;
195 *((u16 *)buf) = decpair[r - 100*q];
202 /* 100 <= q < 10^6 */
203 r = (q * (u64)0x28f5c29) >> 32;
204 *((u16 *)buf) = decpair[q - 100*r];
211 /* 100 <= r < 10^4 */
212 q = (r * 0x147b) >> 19;
213 *((u16 *)buf) = decpair[r - 100*q];
220 *((u16 *)buf) = decpair[r];
221 buf += r < 10 ? 1 : 2;
225 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
226 static noinline_for_stack
227 char *put_dec_full8(char *buf, unsigned r)
232 q = (r * (u64)0x28f5c29) >> 32;
233 *((u16 *)buf) = decpair[r - 100*q];
237 r = (q * (u64)0x28f5c29) >> 32;
238 *((u16 *)buf) = decpair[q - 100*r];
242 q = (r * 0x147b) >> 19;
243 *((u16 *)buf) = decpair[r - 100*q];
247 *((u16 *)buf) = decpair[q];
252 static noinline_for_stack
253 char *put_dec(char *buf, unsigned long long n)
255 if (n >= 100*1000*1000)
256 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
257 /* 1 <= n <= 1.6e11 */
258 if (n >= 100*1000*1000)
259 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
261 return put_dec_trunc8(buf, n);
264 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
267 put_dec_full4(char *buf, unsigned r)
272 q = (r * 0x147b) >> 19;
273 *((u16 *)buf) = decpair[r - 100*q];
276 *((u16 *)buf) = decpair[q];
280 * Call put_dec_full4 on x % 10000, return x / 10000.
281 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
282 * holds for all x < 1,128,869,999. The largest value this
283 * helper will ever be asked to convert is 1,125,520,955.
284 * (second call in the put_dec code, assuming n is all-ones).
286 static noinline_for_stack
287 unsigned put_dec_helper4(char *buf, unsigned x)
289 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
291 put_dec_full4(buf, x - q * 10000);
295 /* Based on code by Douglas W. Jones found at
296 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
297 * (with permission from the author).
298 * Performs no 64-bit division and hence should be fast on 32-bit machines.
301 char *put_dec(char *buf, unsigned long long n)
303 uint32_t d3, d2, d1, q, h;
305 if (n < 100*1000*1000)
306 return put_dec_trunc8(buf, n);
308 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
311 d3 = (h >> 16); /* implicit "& 0xffff" */
313 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
314 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
315 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
316 q = put_dec_helper4(buf, q);
318 q += 7671 * d3 + 9496 * d2 + 6 * d1;
319 q = put_dec_helper4(buf+4, q);
321 q += 4749 * d3 + 42 * d2;
322 q = put_dec_helper4(buf+8, q);
327 buf = put_dec_trunc8(buf, q);
328 else while (buf[-1] == '0')
337 * Convert passed number to decimal string.
338 * Returns the length of string. On buffer overflow, returns 0.
340 * If speed is not important, use snprintf(). It's easy to read the code.
342 int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
344 /* put_dec requires 2-byte alignment of the buffer. */
345 char tmp[sizeof(num) * 3] __aligned(2);
348 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
353 len = put_dec(tmp, num) - tmp;
356 if (len > size || width > size)
361 for (idx = 0; idx < width; idx++)
367 for (idx = 0; idx < len; ++idx)
368 buf[idx + width] = tmp[len - idx - 1];
373 #define SIGN 1 /* unsigned/signed, must be 1 */
374 #define LEFT 2 /* left justified */
375 #define PLUS 4 /* show plus */
376 #define SPACE 8 /* space if plus */
377 #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
378 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
379 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
382 FORMAT_TYPE_NONE, /* Just a string part */
384 FORMAT_TYPE_PRECISION,
388 FORMAT_TYPE_PERCENT_CHAR,
390 FORMAT_TYPE_LONG_LONG,
404 unsigned int type:8; /* format_type enum */
405 signed int field_width:24; /* width of output field */
406 unsigned int flags:8; /* flags to number() */
407 unsigned int base:8; /* number base, 8, 10 or 16 only */
408 signed int precision:16; /* # of digits/chars */
410 static_assert(sizeof(struct printf_spec) == 8);
412 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
413 #define PRECISION_MAX ((1 << 15) - 1)
415 static noinline_for_stack
416 char *number(char *buf, char *end, unsigned long long num,
417 struct printf_spec spec)
419 /* put_dec requires 2-byte alignment of the buffer. */
420 char tmp[3 * sizeof(num)] __aligned(2);
423 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
425 bool is_zero = num == 0LL;
426 int field_width = spec.field_width;
427 int precision = spec.precision;
429 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
430 * produces same digits or (maybe lowercased) letters */
431 locase = (spec.flags & SMALL);
432 if (spec.flags & LEFT)
433 spec.flags &= ~ZEROPAD;
435 if (spec.flags & SIGN) {
436 if ((signed long long)num < 0) {
438 num = -(signed long long)num;
440 } else if (spec.flags & PLUS) {
443 } else if (spec.flags & SPACE) {
455 /* generate full string in tmp[], in reverse order */
458 tmp[i++] = hex_asc_upper[num] | locase;
459 else if (spec.base != 10) { /* 8 or 16 */
460 int mask = spec.base - 1;
466 tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
469 } else { /* base 10 */
470 i = put_dec(tmp, num) - tmp;
473 /* printing 100 using %2d gives "100", not "00" */
476 /* leading space padding */
477 field_width -= precision;
478 if (!(spec.flags & (ZEROPAD | LEFT))) {
479 while (--field_width >= 0) {
491 /* "0x" / "0" prefix */
493 if (spec.base == 16 || !is_zero) {
498 if (spec.base == 16) {
500 *buf = ('X' | locase);
504 /* zero or space padding */
505 if (!(spec.flags & LEFT)) {
506 char c = ' ' + (spec.flags & ZEROPAD);
507 BUILD_BUG_ON(' ' + ZEROPAD != '0');
508 while (--field_width >= 0) {
514 /* hmm even more zero padding? */
515 while (i <= --precision) {
520 /* actual digits of result */
526 /* trailing space padding */
527 while (--field_width >= 0) {
536 static noinline_for_stack
537 char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
539 struct printf_spec spec;
541 spec.type = FORMAT_TYPE_PTR;
542 spec.field_width = 2 + 2 * size; /* 0x + hex */
543 spec.flags = SPECIAL | SMALL | ZEROPAD;
547 return number(buf, end, num, spec);
550 static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
553 if (buf >= end) /* nowhere to put anything */
556 if (size <= spaces) {
557 memset(buf, ' ', size);
561 if (len > size - spaces)
563 memmove(buf + spaces, buf, len);
565 memset(buf, ' ', spaces);
569 * Handle field width padding for a string.
570 * @buf: current buffer position
571 * @n: length of string
572 * @end: end of output buffer
573 * @spec: for field width and flags
574 * Returns: new buffer position after padding.
576 static noinline_for_stack
577 char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
581 if (likely(n >= spec.field_width))
583 /* we want to pad the sucker */
584 spaces = spec.field_width - n;
585 if (!(spec.flags & LEFT)) {
586 move_right(buf - n, end, n, spaces);
597 /* Handle string from a well known address. */
598 static char *string_nocheck(char *buf, char *end, const char *s,
599 struct printf_spec spec)
602 int lim = spec.precision;
613 return widen_string(buf, len, end, spec);
616 /* Be careful: error messages must fit into the given buffer. */
617 static char *error_string(char *buf, char *end, const char *s,
618 struct printf_spec spec)
621 * Hard limit to avoid a completely insane messages. It actually
622 * works pretty well because most error messages are in
623 * the many pointer format modifiers.
625 if (spec.precision == -1)
626 spec.precision = 2 * sizeof(void *);
628 return string_nocheck(buf, end, s, spec);
632 * Do not call any complex external code here. Nested printk()/vsprintf()
633 * might cause infinite loops. Failures might break printk() and would
636 static const char *check_pointer_msg(const void *ptr)
641 if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
647 static int check_pointer(char **buf, char *end, const void *ptr,
648 struct printf_spec spec)
652 err_msg = check_pointer_msg(ptr);
654 *buf = error_string(*buf, end, err_msg, spec);
661 static noinline_for_stack
662 char *string(char *buf, char *end, const char *s,
663 struct printf_spec spec)
665 if (check_pointer(&buf, end, s, spec))
668 return string_nocheck(buf, end, s, spec);
671 static char *pointer_string(char *buf, char *end,
673 struct printf_spec spec)
677 if (spec.field_width == -1) {
678 spec.field_width = 2 * sizeof(ptr);
679 spec.flags |= ZEROPAD;
682 return number(buf, end, (unsigned long int)ptr, spec);
685 /* Make pointers available for printing early in the boot sequence. */
686 static int debug_boot_weak_hash __ro_after_init;
688 static int __init debug_boot_weak_hash_enable(char *str)
690 debug_boot_weak_hash = 1;
691 pr_info("debug_boot_weak_hash enabled\n");
694 early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
696 static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
697 static siphash_key_t ptr_key __read_mostly;
699 static void enable_ptr_key_workfn(struct work_struct *work)
701 get_random_bytes(&ptr_key, sizeof(ptr_key));
702 /* Needs to run from preemptible context */
703 static_branch_disable(¬_filled_random_ptr_key);
706 static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
708 static void fill_random_ptr_key(struct random_ready_callback *unused)
710 /* This may be in an interrupt handler. */
711 queue_work(system_unbound_wq, &enable_ptr_key_work);
714 static struct random_ready_callback random_ready = {
715 .func = fill_random_ptr_key
718 static int __init initialize_ptr_random(void)
720 int key_size = sizeof(ptr_key);
723 /* Use hw RNG if available. */
724 if (get_random_bytes_arch(&ptr_key, key_size) == key_size) {
725 static_branch_disable(¬_filled_random_ptr_key);
729 ret = add_random_ready_callback(&random_ready);
732 } else if (ret == -EALREADY) {
733 /* This is in preemptible context */
734 enable_ptr_key_workfn(&enable_ptr_key_work);
740 early_initcall(initialize_ptr_random);
742 /* Maps a pointer to a 32 bit unique identifier. */
743 static char *ptr_to_id(char *buf, char *end, const void *ptr,
744 struct printf_spec spec)
746 const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
747 unsigned long hashval;
750 * Print the real pointer value for NULL and error pointers,
751 * as they are not actual addresses.
753 if (IS_ERR_OR_NULL(ptr))
754 return pointer_string(buf, end, ptr, spec);
756 /* When debugging early boot use non-cryptographically secure hash. */
757 if (unlikely(debug_boot_weak_hash)) {
758 hashval = hash_long((unsigned long)ptr, 32);
759 return pointer_string(buf, end, (const void *)hashval, spec);
762 if (static_branch_unlikely(¬_filled_random_ptr_key)) {
763 spec.field_width = 2 * sizeof(ptr);
764 /* string length must be less than default_width */
765 return error_string(buf, end, str, spec);
769 hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
771 * Mask off the first 32 bits, this makes explicit that we have
772 * modified the address (and 32 bits is plenty for a unique ID).
774 hashval = hashval & 0xffffffff;
776 hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
778 return pointer_string(buf, end, (const void *)hashval, spec);
781 int kptr_restrict __read_mostly;
783 static noinline_for_stack
784 char *restricted_pointer(char *buf, char *end, const void *ptr,
785 struct printf_spec spec)
787 switch (kptr_restrict) {
789 /* Handle as %p, hash and do _not_ leak addresses. */
790 return ptr_to_id(buf, end, ptr, spec);
792 const struct cred *cred;
795 * kptr_restrict==1 cannot be used in IRQ context
796 * because its test for CAP_SYSLOG would be meaningless.
798 if (in_irq() || in_serving_softirq() || in_nmi()) {
799 if (spec.field_width == -1)
800 spec.field_width = 2 * sizeof(ptr);
801 return error_string(buf, end, "pK-error", spec);
805 * Only print the real pointer value if the current
806 * process has CAP_SYSLOG and is running with the
807 * same credentials it started with. This is because
808 * access to files is checked at open() time, but %pK
809 * checks permission at read() time. We don't want to
810 * leak pointer values if a binary opens a file using
811 * %pK and then elevates privileges before reading it.
813 cred = current_cred();
814 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
815 !uid_eq(cred->euid, cred->uid) ||
816 !gid_eq(cred->egid, cred->gid))
822 /* Always print 0's for %pK */
827 return pointer_string(buf, end, ptr, spec);
830 static noinline_for_stack
831 char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
834 const char *array[4], *s;
835 const struct dentry *p;
840 case '2': case '3': case '4':
841 depth = fmt[1] - '0';
848 for (i = 0; i < depth; i++, d = p) {
849 if (check_pointer(&buf, end, d, spec)) {
854 p = READ_ONCE(d->d_parent);
855 array[i] = READ_ONCE(d->d_name.name);
864 for (n = 0; n != spec.precision; n++, buf++) {
876 return widen_string(buf, n, end, spec);
879 static noinline_for_stack
880 char *file_dentry_name(char *buf, char *end, const struct file *f,
881 struct printf_spec spec, const char *fmt)
883 if (check_pointer(&buf, end, f, spec))
886 return dentry_name(buf, end, f->f_path.dentry, spec, fmt);
889 static noinline_for_stack
890 char *bdev_name(char *buf, char *end, struct block_device *bdev,
891 struct printf_spec spec, const char *fmt)
895 if (check_pointer(&buf, end, bdev, spec))
899 buf = string(buf, end, hd->disk_name, spec);
900 if (bdev->bd_part->partno) {
901 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
906 buf = number(buf, end, bdev->bd_part->partno, spec);
912 static noinline_for_stack
913 char *symbol_string(char *buf, char *end, void *ptr,
914 struct printf_spec spec, const char *fmt)
917 #ifdef CONFIG_KALLSYMS
918 char sym[KSYM_SYMBOL_LEN];
922 ptr = __builtin_extract_return_addr(ptr);
923 value = (unsigned long)ptr;
925 #ifdef CONFIG_KALLSYMS
927 sprint_backtrace(sym, value);
928 else if (*fmt != 'f' && *fmt != 's')
929 sprint_symbol(sym, value);
931 sprint_symbol_no_offset(sym, value);
933 return string_nocheck(buf, end, sym, spec);
935 return special_hex_number(buf, end, value, sizeof(void *));
939 static const struct printf_spec default_str_spec = {
944 static const struct printf_spec default_flag_spec = {
947 .flags = SPECIAL | SMALL,
950 static const struct printf_spec default_dec_spec = {
955 static const struct printf_spec default_dec02_spec = {
962 static const struct printf_spec default_dec04_spec = {
969 static noinline_for_stack
970 char *resource_string(char *buf, char *end, struct resource *res,
971 struct printf_spec spec, const char *fmt)
973 #ifndef IO_RSRC_PRINTK_SIZE
974 #define IO_RSRC_PRINTK_SIZE 6
977 #ifndef MEM_RSRC_PRINTK_SIZE
978 #define MEM_RSRC_PRINTK_SIZE 10
980 static const struct printf_spec io_spec = {
982 .field_width = IO_RSRC_PRINTK_SIZE,
984 .flags = SPECIAL | SMALL | ZEROPAD,
986 static const struct printf_spec mem_spec = {
988 .field_width = MEM_RSRC_PRINTK_SIZE,
990 .flags = SPECIAL | SMALL | ZEROPAD,
992 static const struct printf_spec bus_spec = {
996 .flags = SMALL | ZEROPAD,
998 static const struct printf_spec str_spec = {
1004 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
1005 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
1006 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
1007 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
1008 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
1009 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
1010 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
1011 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
1013 char *p = sym, *pend = sym + sizeof(sym);
1014 int decode = (fmt[0] == 'R') ? 1 : 0;
1015 const struct printf_spec *specp;
1017 if (check_pointer(&buf, end, res, spec))
1021 if (res->flags & IORESOURCE_IO) {
1022 p = string_nocheck(p, pend, "io ", str_spec);
1024 } else if (res->flags & IORESOURCE_MEM) {
1025 p = string_nocheck(p, pend, "mem ", str_spec);
1027 } else if (res->flags & IORESOURCE_IRQ) {
1028 p = string_nocheck(p, pend, "irq ", str_spec);
1029 specp = &default_dec_spec;
1030 } else if (res->flags & IORESOURCE_DMA) {
1031 p = string_nocheck(p, pend, "dma ", str_spec);
1032 specp = &default_dec_spec;
1033 } else if (res->flags & IORESOURCE_BUS) {
1034 p = string_nocheck(p, pend, "bus ", str_spec);
1037 p = string_nocheck(p, pend, "??? ", str_spec);
1041 if (decode && res->flags & IORESOURCE_UNSET) {
1042 p = string_nocheck(p, pend, "size ", str_spec);
1043 p = number(p, pend, resource_size(res), *specp);
1045 p = number(p, pend, res->start, *specp);
1046 if (res->start != res->end) {
1048 p = number(p, pend, res->end, *specp);
1052 if (res->flags & IORESOURCE_MEM_64)
1053 p = string_nocheck(p, pend, " 64bit", str_spec);
1054 if (res->flags & IORESOURCE_PREFETCH)
1055 p = string_nocheck(p, pend, " pref", str_spec);
1056 if (res->flags & IORESOURCE_WINDOW)
1057 p = string_nocheck(p, pend, " window", str_spec);
1058 if (res->flags & IORESOURCE_DISABLED)
1059 p = string_nocheck(p, pend, " disabled", str_spec);
1061 p = string_nocheck(p, pend, " flags ", str_spec);
1062 p = number(p, pend, res->flags, default_flag_spec);
1067 return string_nocheck(buf, end, sym, spec);
1070 static noinline_for_stack
1071 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1074 int i, len = 1; /* if we pass '%ph[CDN]', field width remains
1075 negative value, fallback to the default */
1078 if (spec.field_width == 0)
1079 /* nothing to print */
1082 if (check_pointer(&buf, end, addr, spec))
1100 if (spec.field_width > 0)
1101 len = min_t(int, spec.field_width, 64);
1103 for (i = 0; i < len; ++i) {
1105 *buf = hex_asc_hi(addr[i]);
1108 *buf = hex_asc_lo(addr[i]);
1111 if (separator && i != len - 1) {
1121 static noinline_for_stack
1122 char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
1123 struct printf_spec spec, const char *fmt)
1125 const int CHUNKSZ = 32;
1126 int nr_bits = max_t(int, spec.field_width, 0);
1130 if (check_pointer(&buf, end, bitmap, spec))
1133 /* reused to print numbers */
1134 spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
1136 chunksz = nr_bits & (CHUNKSZ - 1);
1140 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
1141 for (; i >= 0; i -= CHUNKSZ) {
1145 chunkmask = ((1ULL << chunksz) - 1);
1146 word = i / BITS_PER_LONG;
1147 bit = i % BITS_PER_LONG;
1148 val = (bitmap[word] >> bit) & chunkmask;
1157 spec.field_width = DIV_ROUND_UP(chunksz, 4);
1158 buf = number(buf, end, val, spec);
1165 static noinline_for_stack
1166 char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
1167 struct printf_spec spec, const char *fmt)
1169 int nr_bits = max_t(int, spec.field_width, 0);
1170 /* current bit is 'cur', most recently seen range is [rbot, rtop] */
1171 int cur, rbot, rtop;
1174 if (check_pointer(&buf, end, bitmap, spec))
1177 rbot = cur = find_first_bit(bitmap, nr_bits);
1178 while (cur < nr_bits) {
1180 cur = find_next_bit(bitmap, nr_bits, cur + 1);
1181 if (cur < nr_bits && cur <= rtop + 1)
1191 buf = number(buf, end, rbot, default_dec_spec);
1197 buf = number(buf, end, rtop, default_dec_spec);
1205 static noinline_for_stack
1206 char *mac_address_string(char *buf, char *end, u8 *addr,
1207 struct printf_spec spec, const char *fmt)
1209 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
1213 bool reversed = false;
1215 if (check_pointer(&buf, end, addr, spec))
1232 for (i = 0; i < 6; i++) {
1234 p = hex_byte_pack(p, addr[5 - i]);
1236 p = hex_byte_pack(p, addr[i]);
1238 if (fmt[0] == 'M' && i != 5)
1243 return string_nocheck(buf, end, mac_addr, spec);
1246 static noinline_for_stack
1247 char *ip4_string(char *p, const u8 *addr, const char *fmt)
1250 bool leading_zeros = (fmt[0] == 'i');
1275 for (i = 0; i < 4; i++) {
1276 char temp[4] __aligned(2); /* hold each IP quad in reverse order */
1277 int digits = put_dec_trunc8(temp, addr[index]) - temp;
1278 if (leading_zeros) {
1284 /* reverse the digits in the quad */
1286 *p++ = temp[digits];
1296 static noinline_for_stack
1297 char *ip6_compressed_string(char *p, const char *addr)
1300 unsigned char zerolength[8];
1305 bool needcolon = false;
1307 struct in6_addr in6;
1309 memcpy(&in6, addr, sizeof(struct in6_addr));
1311 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
1313 memset(zerolength, 0, sizeof(zerolength));
1320 /* find position of longest 0 run */
1321 for (i = 0; i < range; i++) {
1322 for (j = i; j < range; j++) {
1323 if (in6.s6_addr16[j] != 0)
1328 for (i = 0; i < range; i++) {
1329 if (zerolength[i] > longest) {
1330 longest = zerolength[i];
1334 if (longest == 1) /* don't compress a single 0 */
1338 for (i = 0; i < range; i++) {
1339 if (i == colonpos) {
1340 if (needcolon || i == 0)
1351 /* hex u16 without leading 0s */
1352 word = ntohs(in6.s6_addr16[i]);
1357 p = hex_byte_pack(p, hi);
1359 *p++ = hex_asc_lo(hi);
1360 p = hex_byte_pack(p, lo);
1363 p = hex_byte_pack(p, lo);
1365 *p++ = hex_asc_lo(lo);
1372 p = ip4_string(p, &in6.s6_addr[12], "I4");
1379 static noinline_for_stack
1380 char *ip6_string(char *p, const char *addr, const char *fmt)
1384 for (i = 0; i < 8; i++) {
1385 p = hex_byte_pack(p, *addr++);
1386 p = hex_byte_pack(p, *addr++);
1387 if (fmt[0] == 'I' && i != 7)
1395 static noinline_for_stack
1396 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
1397 struct printf_spec spec, const char *fmt)
1399 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1401 if (fmt[0] == 'I' && fmt[2] == 'c')
1402 ip6_compressed_string(ip6_addr, addr);
1404 ip6_string(ip6_addr, addr, fmt);
1406 return string_nocheck(buf, end, ip6_addr, spec);
1409 static noinline_for_stack
1410 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
1411 struct printf_spec spec, const char *fmt)
1413 char ip4_addr[sizeof("255.255.255.255")];
1415 ip4_string(ip4_addr, addr, fmt);
1417 return string_nocheck(buf, end, ip4_addr, spec);
1420 static noinline_for_stack
1421 char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1422 struct printf_spec spec, const char *fmt)
1424 bool have_p = false, have_s = false, have_f = false, have_c = false;
1425 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1426 sizeof(":12345") + sizeof("/123456789") +
1427 sizeof("%1234567890")];
1428 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1429 const u8 *addr = (const u8 *) &sa->sin6_addr;
1430 char fmt6[2] = { fmt[0], '6' };
1434 while (isalpha(*++fmt)) {
1451 if (have_p || have_s || have_f) {
1456 if (fmt6[0] == 'I' && have_c)
1457 p = ip6_compressed_string(ip6_addr + off, addr);
1459 p = ip6_string(ip6_addr + off, addr, fmt6);
1461 if (have_p || have_s || have_f)
1466 p = number(p, pend, ntohs(sa->sin6_port), spec);
1470 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1471 IPV6_FLOWINFO_MASK), spec);
1475 p = number(p, pend, sa->sin6_scope_id, spec);
1479 return string_nocheck(buf, end, ip6_addr, spec);
1482 static noinline_for_stack
1483 char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1484 struct printf_spec spec, const char *fmt)
1486 bool have_p = false;
1487 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1488 char *pend = ip4_addr + sizeof(ip4_addr);
1489 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1490 char fmt4[3] = { fmt[0], '4', 0 };
1493 while (isalpha(*++fmt)) {
1507 p = ip4_string(ip4_addr, addr, fmt4);
1510 p = number(p, pend, ntohs(sa->sin_port), spec);
1514 return string_nocheck(buf, end, ip4_addr, spec);
1517 static noinline_for_stack
1518 char *ip_addr_string(char *buf, char *end, const void *ptr,
1519 struct printf_spec spec, const char *fmt)
1523 if (check_pointer(&buf, end, ptr, spec))
1528 return ip6_addr_string(buf, end, ptr, spec, fmt);
1530 return ip4_addr_string(buf, end, ptr, spec, fmt);
1533 struct sockaddr raw;
1534 struct sockaddr_in v4;
1535 struct sockaddr_in6 v6;
1538 switch (sa->raw.sa_family) {
1540 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1542 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1544 return error_string(buf, end, "(einval)", spec);
1548 err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)";
1549 return error_string(buf, end, err_fmt_msg, spec);
1552 static noinline_for_stack
1553 char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1558 unsigned int flags = 0;
1561 if (spec.field_width == 0)
1562 return buf; /* nothing to print */
1564 if (check_pointer(&buf, end, addr, spec))
1568 switch (fmt[count++]) {
1570 flags |= ESCAPE_ANY;
1573 flags |= ESCAPE_SPECIAL;
1576 flags |= ESCAPE_HEX;
1579 flags |= ESCAPE_NULL;
1582 flags |= ESCAPE_OCTAL;
1588 flags |= ESCAPE_SPACE;
1597 flags = ESCAPE_ANY_NP;
1599 len = spec.field_width < 0 ? 1 : spec.field_width;
1602 * string_escape_mem() writes as many characters as it can to
1603 * the given buffer, and returns the total size of the output
1604 * had the buffer been big enough.
1606 buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
1611 static char *va_format(char *buf, char *end, struct va_format *va_fmt,
1612 struct printf_spec spec, const char *fmt)
1616 if (check_pointer(&buf, end, va_fmt, spec))
1619 va_copy(va, *va_fmt->va);
1620 buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
1626 static noinline_for_stack
1627 char *uuid_string(char *buf, char *end, const u8 *addr,
1628 struct printf_spec spec, const char *fmt)
1630 char uuid[UUID_STRING_LEN + 1];
1633 const u8 *index = uuid_index;
1636 if (check_pointer(&buf, end, addr, spec))
1641 uc = true; /* fall-through */
1650 for (i = 0; i < 16; i++) {
1652 p = hex_byte_pack_upper(p, addr[index[i]]);
1654 p = hex_byte_pack(p, addr[index[i]]);
1667 return string_nocheck(buf, end, uuid, spec);
1670 static noinline_for_stack
1671 char *netdev_bits(char *buf, char *end, const void *addr,
1672 struct printf_spec spec, const char *fmt)
1674 unsigned long long num;
1677 if (check_pointer(&buf, end, addr, spec))
1682 num = *(const netdev_features_t *)addr;
1683 size = sizeof(netdev_features_t);
1686 return error_string(buf, end, "(%pN?)", spec);
1689 return special_hex_number(buf, end, num, size);
1692 static noinline_for_stack
1693 char *address_val(char *buf, char *end, const void *addr,
1694 struct printf_spec spec, const char *fmt)
1696 unsigned long long num;
1699 if (check_pointer(&buf, end, addr, spec))
1704 num = *(const dma_addr_t *)addr;
1705 size = sizeof(dma_addr_t);
1709 num = *(const phys_addr_t *)addr;
1710 size = sizeof(phys_addr_t);
1714 return special_hex_number(buf, end, num, size);
1717 static noinline_for_stack
1718 char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1720 int year = tm->tm_year + (r ? 0 : 1900);
1721 int mon = tm->tm_mon + (r ? 0 : 1);
1723 buf = number(buf, end, year, default_dec04_spec);
1728 buf = number(buf, end, mon, default_dec02_spec);
1733 return number(buf, end, tm->tm_mday, default_dec02_spec);
1736 static noinline_for_stack
1737 char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1739 buf = number(buf, end, tm->tm_hour, default_dec02_spec);
1744 buf = number(buf, end, tm->tm_min, default_dec02_spec);
1749 return number(buf, end, tm->tm_sec, default_dec02_spec);
1752 static noinline_for_stack
1753 char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
1754 struct printf_spec spec, const char *fmt)
1756 bool have_t = true, have_d = true;
1760 if (check_pointer(&buf, end, tm, spec))
1763 switch (fmt[count]) {
1774 raw = fmt[count] == 'r';
1777 buf = date_str(buf, end, tm, raw);
1778 if (have_d && have_t) {
1779 /* Respect ISO 8601 */
1785 buf = time_str(buf, end, tm, raw);
1790 static noinline_for_stack
1791 char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
1796 return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt);
1798 return error_string(buf, end, "(%ptR?)", spec);
1802 static noinline_for_stack
1803 char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
1806 if (!IS_ENABLED(CONFIG_HAVE_CLK))
1807 return error_string(buf, end, "(%pC?)", spec);
1809 if (check_pointer(&buf, end, clk, spec))
1815 #ifdef CONFIG_COMMON_CLK
1816 return string(buf, end, __clk_get_name(clk), spec);
1818 return ptr_to_id(buf, end, clk, spec);
1824 char *format_flags(char *buf, char *end, unsigned long flags,
1825 const struct trace_print_flags *names)
1829 for ( ; flags && names->name; names++) {
1831 if ((flags & mask) != mask)
1834 buf = string(buf, end, names->name, default_str_spec);
1845 buf = number(buf, end, flags, default_flag_spec);
1850 static noinline_for_stack
1851 char *flags_string(char *buf, char *end, void *flags_ptr,
1852 struct printf_spec spec, const char *fmt)
1854 unsigned long flags;
1855 const struct trace_print_flags *names;
1857 if (check_pointer(&buf, end, flags_ptr, spec))
1862 flags = *(unsigned long *)flags_ptr;
1863 /* Remove zone id */
1864 flags &= (1UL << NR_PAGEFLAGS) - 1;
1865 names = pageflag_names;
1868 flags = *(unsigned long *)flags_ptr;
1869 names = vmaflag_names;
1872 flags = *(gfp_t *)flags_ptr;
1873 names = gfpflag_names;
1876 return error_string(buf, end, "(%pG?)", spec);
1879 return format_flags(buf, end, flags, names);
1882 static const char *device_node_name_for_depth(const struct device_node *np, int depth)
1884 for ( ; np && depth; depth--)
1887 return kbasename(np->full_name);
1890 static noinline_for_stack
1891 char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end)
1894 const struct device_node *parent = np->parent;
1896 /* special case for root node */
1898 return string_nocheck(buf, end, "/", default_str_spec);
1900 for (depth = 0; parent->parent; depth++)
1901 parent = parent->parent;
1903 for ( ; depth >= 0; depth--) {
1904 buf = string_nocheck(buf, end, "/", default_str_spec);
1905 buf = string(buf, end, device_node_name_for_depth(np, depth),
1911 static noinline_for_stack
1912 char *device_node_string(char *buf, char *end, struct device_node *dn,
1913 struct printf_spec spec, const char *fmt)
1915 char tbuf[sizeof("xxxx") + 1];
1918 char *buf_start = buf;
1919 struct property *prop;
1920 bool has_mult, pass;
1921 static const struct printf_spec num_spec = {
1928 struct printf_spec str_spec = spec;
1929 str_spec.field_width = -1;
1931 if (!IS_ENABLED(CONFIG_OF))
1932 return error_string(buf, end, "(%pOF?)", spec);
1934 if (check_pointer(&buf, end, dn, spec))
1937 /* simple case without anything any more format specifiers */
1939 if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
1942 for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {
1951 case 'f': /* full_name */
1952 buf = device_node_gen_full_name(dn, buf, end);
1954 case 'n': /* name */
1955 p = kbasename(of_node_full_name(dn));
1956 precision = str_spec.precision;
1957 str_spec.precision = strchrnul(p, '@') - p;
1958 buf = string(buf, end, p, str_spec);
1959 str_spec.precision = precision;
1961 case 'p': /* phandle */
1962 buf = number(buf, end, (unsigned int)dn->phandle, num_spec);
1964 case 'P': /* path-spec */
1965 p = kbasename(of_node_full_name(dn));
1968 buf = string(buf, end, p, str_spec);
1970 case 'F': /* flags */
1971 tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
1972 tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
1973 tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
1974 tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
1976 buf = string_nocheck(buf, end, tbuf, str_spec);
1978 case 'c': /* major compatible string */
1979 ret = of_property_read_string(dn, "compatible", &p);
1981 buf = string(buf, end, p, str_spec);
1983 case 'C': /* full compatible string */
1985 of_property_for_each_string(dn, "compatible", prop, p) {
1987 buf = string_nocheck(buf, end, ",", str_spec);
1988 buf = string_nocheck(buf, end, "\"", str_spec);
1989 buf = string(buf, end, p, str_spec);
1990 buf = string_nocheck(buf, end, "\"", str_spec);
2000 return widen_string(buf, buf - buf_start, end, spec);
2003 static char *kobject_string(char *buf, char *end, void *ptr,
2004 struct printf_spec spec, const char *fmt)
2008 return device_node_string(buf, end, ptr, spec, fmt + 1);
2011 return error_string(buf, end, "(%pO?)", spec);
2015 * Show a '%p' thing. A kernel extension is that the '%p' is followed
2016 * by an extra set of alphanumeric characters that are extended format
2019 * Please update scripts/checkpatch.pl when adding/removing conversion
2020 * characters. (Search for "check for vsprintf extension").
2022 * Right now we handle:
2024 * - 'S' For symbolic direct pointers (or function descriptors) with offset
2025 * - 's' For symbolic direct pointers (or function descriptors) without offset
2028 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
2029 * - 'B' For backtraced symbolic direct pointers with offset
2030 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
2031 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
2032 * - 'b[l]' For a bitmap, the number of bits is determined by the field
2033 * width which must be explicitly specified either as part of the
2034 * format string '%32b[l]' or through '%*b[l]', [l] selects
2035 * range-list format instead of hex format
2036 * - 'M' For a 6-byte MAC address, it prints the address in the
2037 * usual colon-separated hex notation
2038 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
2039 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
2040 * with a dash-separated hex notation
2041 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
2042 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
2043 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
2044 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
2046 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2047 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2048 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
2049 * IPv6 omits the colons (01020304...0f)
2050 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
2052 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2053 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2054 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
2055 * - 'I[6S]c' for IPv6 addresses printed as specified by
2056 * http://tools.ietf.org/html/rfc5952
2057 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
2058 * of the following flags (see string_escape_mem() for the
2061 * c - ESCAPE_SPECIAL
2067 * By default ESCAPE_ANY_NP is used.
2068 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
2069 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
2070 * Options for %pU are:
2071 * b big endian lower case hex (default)
2072 * B big endian UPPER case hex
2073 * l little endian lower case hex
2074 * L little endian UPPER case hex
2075 * big endian output byte order is:
2076 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
2077 * little endian output byte order is:
2078 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
2079 * - 'V' For a struct va_format which contains a format string * and va_list *,
2080 * call vsnprintf(->format, *->va_list).
2081 * Implements a "recursive vsnprintf".
2082 * Do not use this feature without some mechanism to verify the
2083 * correctness of the format string and va_list arguments.
2084 * - 'K' For a kernel pointer that should be hidden from unprivileged users
2085 * - 'NF' For a netdev_features_t
2086 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
2087 * a certain separator (' ' by default):
2091 * The maximum supported length is 64 bytes of the input. Consider
2092 * to use print_hex_dump() for the larger input.
2093 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
2094 * (default assumed to be phys_addr_t, passed by reference)
2095 * - 'd[234]' For a dentry name (optionally 2-4 last components)
2096 * - 'D[234]' Same as 'd' but for a struct file
2097 * - 'g' For block_device name (gendisk + partition number)
2098 * - 't[R][dt][r]' For time and date as represented:
2100 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
2101 * (legacy clock framework) of the clock
2102 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
2103 * (legacy clock framework) of the clock
2104 * - 'G' For flags to be printed as a collection of symbolic strings that would
2105 * construct the specific value. Supported flags given by option:
2106 * p page flags (see struct page) given as pointer to unsigned long
2107 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
2108 * v vma flags (VM_*) given as pointer to unsigned long
2109 * - 'OF[fnpPcCF]' For a device tree object
2110 * Without any optional arguments prints the full_name
2111 * f device node full_name
2112 * n device node name
2113 * p device node phandle
2114 * P device node path spec (name + @unit)
2115 * F device node flags
2116 * c major compatible string
2117 * C full compatible string
2118 * - 'x' For printing the address. Equivalent to "%lx".
2120 * ** When making changes please also update:
2121 * Documentation/core-api/printk-formats.rst
2123 * Note: The default behaviour (unadorned %p) is to hash the address,
2124 * rendering it useful as a unique identifier.
2126 static noinline_for_stack
2127 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
2128 struct printf_spec spec)
2135 ptr = dereference_symbol_descriptor(ptr);
2138 return symbol_string(buf, end, ptr, spec, fmt);
2141 return resource_string(buf, end, ptr, spec, fmt);
2143 return hex_string(buf, end, ptr, spec, fmt);
2147 return bitmap_list_string(buf, end, ptr, spec, fmt);
2149 return bitmap_string(buf, end, ptr, spec, fmt);
2151 case 'M': /* Colon separated: 00:01:02:03:04:05 */
2152 case 'm': /* Contiguous: 000102030405 */
2154 /* [mM]R (Reverse order; Bluetooth) */
2155 return mac_address_string(buf, end, ptr, spec, fmt);
2156 case 'I': /* Formatted IP supported
2158 * 6: 0001:0203:...:0708
2159 * 6c: 1::708 or 1::1.2.3.4
2161 case 'i': /* Contiguous:
2162 * 4: 001.002.003.004
2165 return ip_addr_string(buf, end, ptr, spec, fmt);
2167 return escaped_string(buf, end, ptr, spec, fmt);
2169 return uuid_string(buf, end, ptr, spec, fmt);
2171 return va_format(buf, end, ptr, spec, fmt);
2173 return restricted_pointer(buf, end, ptr, spec);
2175 return netdev_bits(buf, end, ptr, spec, fmt);
2177 return address_val(buf, end, ptr, spec, fmt);
2179 return dentry_name(buf, end, ptr, spec, fmt);
2181 return time_and_date(buf, end, ptr, spec, fmt);
2183 return clock(buf, end, ptr, spec, fmt);
2185 return file_dentry_name(buf, end, ptr, spec, fmt);
2188 return bdev_name(buf, end, ptr, spec, fmt);
2192 return flags_string(buf, end, ptr, spec, fmt);
2194 return kobject_string(buf, end, ptr, spec, fmt);
2196 return pointer_string(buf, end, ptr, spec);
2199 /* default is to _not_ leak addresses, hash before printing */
2200 return ptr_to_id(buf, end, ptr, spec);
2204 * Helper function to decode printf style format.
2205 * Each call decode a token from the format and return the
2206 * number of characters read (or likely the delta where it wants
2207 * to go on the next call).
2208 * The decoded token is returned through the parameters
2210 * 'h', 'l', or 'L' for integer fields
2211 * 'z' support added 23/7/1999 S.H.
2212 * 'z' changed to 'Z' --davidm 1/25/99
2213 * 'Z' changed to 'z' --adobriyan 2017-01-25
2214 * 't' added for ptrdiff_t
2216 * @fmt: the format string
2217 * @type of the token returned
2218 * @flags: various flags such as +, -, # tokens..
2219 * @field_width: overwritten width
2220 * @base: base of the number (octal, hex, ...)
2221 * @precision: precision of a number
2222 * @qualifier: qualifier of a number (long, size_t, ...)
2224 static noinline_for_stack
2225 int format_decode(const char *fmt, struct printf_spec *spec)
2227 const char *start = fmt;
2230 /* we finished early by reading the field width */
2231 if (spec->type == FORMAT_TYPE_WIDTH) {
2232 if (spec->field_width < 0) {
2233 spec->field_width = -spec->field_width;
2234 spec->flags |= LEFT;
2236 spec->type = FORMAT_TYPE_NONE;
2240 /* we finished early by reading the precision */
2241 if (spec->type == FORMAT_TYPE_PRECISION) {
2242 if (spec->precision < 0)
2243 spec->precision = 0;
2245 spec->type = FORMAT_TYPE_NONE;
2250 spec->type = FORMAT_TYPE_NONE;
2252 for (; *fmt ; ++fmt) {
2257 /* Return the current non-format string */
2258 if (fmt != start || !*fmt)
2264 while (1) { /* this also skips first '%' */
2270 case '-': spec->flags |= LEFT; break;
2271 case '+': spec->flags |= PLUS; break;
2272 case ' ': spec->flags |= SPACE; break;
2273 case '#': spec->flags |= SPECIAL; break;
2274 case '0': spec->flags |= ZEROPAD; break;
2275 default: found = false;
2282 /* get field width */
2283 spec->field_width = -1;
2286 spec->field_width = skip_atoi(&fmt);
2287 else if (*fmt == '*') {
2288 /* it's the next argument */
2289 spec->type = FORMAT_TYPE_WIDTH;
2290 return ++fmt - start;
2294 /* get the precision */
2295 spec->precision = -1;
2298 if (isdigit(*fmt)) {
2299 spec->precision = skip_atoi(&fmt);
2300 if (spec->precision < 0)
2301 spec->precision = 0;
2302 } else if (*fmt == '*') {
2303 /* it's the next argument */
2304 spec->type = FORMAT_TYPE_PRECISION;
2305 return ++fmt - start;
2310 /* get the conversion qualifier */
2312 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2313 *fmt == 'z' || *fmt == 't') {
2315 if (unlikely(qualifier == *fmt)) {
2316 if (qualifier == 'l') {
2319 } else if (qualifier == 'h') {
2330 spec->type = FORMAT_TYPE_CHAR;
2331 return ++fmt - start;
2334 spec->type = FORMAT_TYPE_STR;
2335 return ++fmt - start;
2338 spec->type = FORMAT_TYPE_PTR;
2339 return ++fmt - start;
2342 spec->type = FORMAT_TYPE_PERCENT_CHAR;
2343 return ++fmt - start;
2345 /* integer number formats - set up the flags and "break" */
2351 spec->flags |= SMALL;
2360 spec->flags |= SIGN;
2366 * Since %n poses a greater security risk than
2367 * utility, treat it as any other invalid or
2368 * unsupported format specifier.
2373 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
2374 spec->type = FORMAT_TYPE_INVALID;
2378 if (qualifier == 'L')
2379 spec->type = FORMAT_TYPE_LONG_LONG;
2380 else if (qualifier == 'l') {
2381 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
2382 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
2383 } else if (qualifier == 'z') {
2384 spec->type = FORMAT_TYPE_SIZE_T;
2385 } else if (qualifier == 't') {
2386 spec->type = FORMAT_TYPE_PTRDIFF;
2387 } else if (qualifier == 'H') {
2388 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
2389 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
2390 } else if (qualifier == 'h') {
2391 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
2392 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
2394 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
2395 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
2398 return ++fmt - start;
2402 set_field_width(struct printf_spec *spec, int width)
2404 spec->field_width = width;
2405 if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
2406 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
2411 set_precision(struct printf_spec *spec, int prec)
2413 spec->precision = prec;
2414 if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
2415 spec->precision = clamp(prec, 0, PRECISION_MAX);
2420 * vsnprintf - Format a string and place it in a buffer
2421 * @buf: The buffer to place the result into
2422 * @size: The size of the buffer, including the trailing null space
2423 * @fmt: The format string to use
2424 * @args: Arguments for the format string
2426 * This function generally follows C99 vsnprintf, but has some
2427 * extensions and a few limitations:
2429 * - ``%n`` is unsupported
2430 * - ``%p*`` is handled by pointer()
2432 * See pointer() or Documentation/core-api/printk-formats.rst for more
2433 * extensive description.
2435 * **Please update the documentation in both places when making changes**
2437 * The return value is the number of characters which would
2438 * be generated for the given input, excluding the trailing
2439 * '\0', as per ISO C99. If you want to have the exact
2440 * number of characters written into @buf as return value
2441 * (not including the trailing '\0'), use vscnprintf(). If the
2442 * return is greater than or equal to @size, the resulting
2443 * string is truncated.
2445 * If you're not already dealing with a va_list consider using snprintf().
2447 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
2449 unsigned long long num;
2451 struct printf_spec spec = {0};
2453 /* Reject out-of-range values early. Large positive sizes are
2454 used for unknown buffer sizes. */
2455 if (WARN_ON_ONCE(size > INT_MAX))
2461 /* Make sure end is always >= buf */
2468 const char *old_fmt = fmt;
2469 int read = format_decode(fmt, &spec);
2473 switch (spec.type) {
2474 case FORMAT_TYPE_NONE: {
2477 if (copy > end - str)
2479 memcpy(str, old_fmt, copy);
2485 case FORMAT_TYPE_WIDTH:
2486 set_field_width(&spec, va_arg(args, int));
2489 case FORMAT_TYPE_PRECISION:
2490 set_precision(&spec, va_arg(args, int));
2493 case FORMAT_TYPE_CHAR: {
2496 if (!(spec.flags & LEFT)) {
2497 while (--spec.field_width > 0) {
2504 c = (unsigned char) va_arg(args, int);
2508 while (--spec.field_width > 0) {
2516 case FORMAT_TYPE_STR:
2517 str = string(str, end, va_arg(args, char *), spec);
2520 case FORMAT_TYPE_PTR:
2521 str = pointer(fmt, str, end, va_arg(args, void *),
2523 while (isalnum(*fmt))
2527 case FORMAT_TYPE_PERCENT_CHAR:
2533 case FORMAT_TYPE_INVALID:
2535 * Presumably the arguments passed gcc's type
2536 * checking, but there is no safe or sane way
2537 * for us to continue parsing the format and
2538 * fetching from the va_list; the remaining
2539 * specifiers and arguments would be out of
2545 switch (spec.type) {
2546 case FORMAT_TYPE_LONG_LONG:
2547 num = va_arg(args, long long);
2549 case FORMAT_TYPE_ULONG:
2550 num = va_arg(args, unsigned long);
2552 case FORMAT_TYPE_LONG:
2553 num = va_arg(args, long);
2555 case FORMAT_TYPE_SIZE_T:
2556 if (spec.flags & SIGN)
2557 num = va_arg(args, ssize_t);
2559 num = va_arg(args, size_t);
2561 case FORMAT_TYPE_PTRDIFF:
2562 num = va_arg(args, ptrdiff_t);
2564 case FORMAT_TYPE_UBYTE:
2565 num = (unsigned char) va_arg(args, int);
2567 case FORMAT_TYPE_BYTE:
2568 num = (signed char) va_arg(args, int);
2570 case FORMAT_TYPE_USHORT:
2571 num = (unsigned short) va_arg(args, int);
2573 case FORMAT_TYPE_SHORT:
2574 num = (short) va_arg(args, int);
2576 case FORMAT_TYPE_INT:
2577 num = (int) va_arg(args, int);
2580 num = va_arg(args, unsigned int);
2583 str = number(str, end, num, spec);
2595 /* the trailing null byte doesn't count towards the total */
2599 EXPORT_SYMBOL(vsnprintf);
2602 * vscnprintf - Format a string and place it in a buffer
2603 * @buf: The buffer to place the result into
2604 * @size: The size of the buffer, including the trailing null space
2605 * @fmt: The format string to use
2606 * @args: Arguments for the format string
2608 * The return value is the number of characters which have been written into
2609 * the @buf not including the trailing '\0'. If @size is == 0 the function
2612 * If you're not already dealing with a va_list consider using scnprintf().
2614 * See the vsnprintf() documentation for format string extensions over C99.
2616 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
2620 i = vsnprintf(buf, size, fmt, args);
2622 if (likely(i < size))
2628 EXPORT_SYMBOL(vscnprintf);
2631 * snprintf - Format a string and place it in a buffer
2632 * @buf: The buffer to place the result into
2633 * @size: The size of the buffer, including the trailing null space
2634 * @fmt: The format string to use
2635 * @...: Arguments for the format string
2637 * The return value is the number of characters which would be
2638 * generated for the given input, excluding the trailing null,
2639 * as per ISO C99. If the return is greater than or equal to
2640 * @size, the resulting string is truncated.
2642 * See the vsnprintf() documentation for format string extensions over C99.
2644 int snprintf(char *buf, size_t size, const char *fmt, ...)
2649 va_start(args, fmt);
2650 i = vsnprintf(buf, size, fmt, args);
2655 EXPORT_SYMBOL(snprintf);
2658 * scnprintf - Format a string and place it in a buffer
2659 * @buf: The buffer to place the result into
2660 * @size: The size of the buffer, including the trailing null space
2661 * @fmt: The format string to use
2662 * @...: Arguments for the format string
2664 * The return value is the number of characters written into @buf not including
2665 * the trailing '\0'. If @size is == 0 the function returns 0.
2668 int scnprintf(char *buf, size_t size, const char *fmt, ...)
2673 va_start(args, fmt);
2674 i = vscnprintf(buf, size, fmt, args);
2679 EXPORT_SYMBOL(scnprintf);
2682 * vsprintf - Format a string and place it in a buffer
2683 * @buf: The buffer to place the result into
2684 * @fmt: The format string to use
2685 * @args: Arguments for the format string
2687 * The function returns the number of characters written
2688 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
2691 * If you're not already dealing with a va_list consider using sprintf().
2693 * See the vsnprintf() documentation for format string extensions over C99.
2695 int vsprintf(char *buf, const char *fmt, va_list args)
2697 return vsnprintf(buf, INT_MAX, fmt, args);
2699 EXPORT_SYMBOL(vsprintf);
2702 * sprintf - Format a string and place it in a buffer
2703 * @buf: The buffer to place the result into
2704 * @fmt: The format string to use
2705 * @...: Arguments for the format string
2707 * The function returns the number of characters written
2708 * into @buf. Use snprintf() or scnprintf() in order to avoid
2711 * See the vsnprintf() documentation for format string extensions over C99.
2713 int sprintf(char *buf, const char *fmt, ...)
2718 va_start(args, fmt);
2719 i = vsnprintf(buf, INT_MAX, fmt, args);
2724 EXPORT_SYMBOL(sprintf);
2726 #ifdef CONFIG_BINARY_PRINTF
2729 * vbin_printf() - VA arguments to binary data
2730 * bstr_printf() - Binary data to text string
2734 * vbin_printf - Parse a format string and place args' binary value in a buffer
2735 * @bin_buf: The buffer to place args' binary value
2736 * @size: The size of the buffer(by words(32bits), not characters)
2737 * @fmt: The format string to use
2738 * @args: Arguments for the format string
2740 * The format follows C99 vsnprintf, except %n is ignored, and its argument
2743 * The return value is the number of words(32bits) which would be generated for
2747 * If the return value is greater than @size, the resulting bin_buf is NOT
2748 * valid for bstr_printf().
2750 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
2752 struct printf_spec spec = {0};
2756 str = (char *)bin_buf;
2757 end = (char *)(bin_buf + size);
2759 #define save_arg(type) \
2761 unsigned long long value; \
2762 if (sizeof(type) == 8) { \
2763 unsigned long long val8; \
2764 str = PTR_ALIGN(str, sizeof(u32)); \
2765 val8 = va_arg(args, unsigned long long); \
2766 if (str + sizeof(type) <= end) { \
2767 *(u32 *)str = *(u32 *)&val8; \
2768 *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \
2772 unsigned int val4; \
2773 str = PTR_ALIGN(str, sizeof(type)); \
2774 val4 = va_arg(args, int); \
2775 if (str + sizeof(type) <= end) \
2776 *(typeof(type) *)str = (type)(long)val4; \
2777 value = (unsigned long long)val4; \
2779 str += sizeof(type); \
2784 int read = format_decode(fmt, &spec);
2788 switch (spec.type) {
2789 case FORMAT_TYPE_NONE:
2790 case FORMAT_TYPE_PERCENT_CHAR:
2792 case FORMAT_TYPE_INVALID:
2795 case FORMAT_TYPE_WIDTH:
2796 case FORMAT_TYPE_PRECISION:
2797 width = (int)save_arg(int);
2798 /* Pointers may require the width */
2800 set_field_width(&spec, width);
2803 case FORMAT_TYPE_CHAR:
2807 case FORMAT_TYPE_STR: {
2808 const char *save_str = va_arg(args, char *);
2809 const char *err_msg;
2812 err_msg = check_pointer_msg(save_str);
2816 len = strlen(save_str) + 1;
2817 if (str + len < end)
2818 memcpy(str, save_str, len);
2823 case FORMAT_TYPE_PTR:
2824 /* Dereferenced pointers must be done now */
2826 /* Dereference of functions is still OK */
2836 if (!isalnum(*fmt)) {
2840 str = pointer(fmt, str, end, va_arg(args, void *),
2845 end[-1] = '\0'; /* Must be nul terminated */
2847 /* skip all alphanumeric pointer suffixes */
2848 while (isalnum(*fmt))
2853 switch (spec.type) {
2855 case FORMAT_TYPE_LONG_LONG:
2856 save_arg(long long);
2858 case FORMAT_TYPE_ULONG:
2859 case FORMAT_TYPE_LONG:
2860 save_arg(unsigned long);
2862 case FORMAT_TYPE_SIZE_T:
2865 case FORMAT_TYPE_PTRDIFF:
2866 save_arg(ptrdiff_t);
2868 case FORMAT_TYPE_UBYTE:
2869 case FORMAT_TYPE_BYTE:
2872 case FORMAT_TYPE_USHORT:
2873 case FORMAT_TYPE_SHORT:
2883 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
2886 EXPORT_SYMBOL_GPL(vbin_printf);
2889 * bstr_printf - Format a string from binary arguments and place it in a buffer
2890 * @buf: The buffer to place the result into
2891 * @size: The size of the buffer, including the trailing null space
2892 * @fmt: The format string to use
2893 * @bin_buf: Binary arguments for the format string
2895 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
2896 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
2897 * a binary buffer that generated by vbin_printf.
2899 * The format follows C99 vsnprintf, but has some extensions:
2900 * see vsnprintf comment for details.
2902 * The return value is the number of characters which would
2903 * be generated for the given input, excluding the trailing
2904 * '\0', as per ISO C99. If you want to have the exact
2905 * number of characters written into @buf as return value
2906 * (not including the trailing '\0'), use vscnprintf(). If the
2907 * return is greater than or equal to @size, the resulting
2908 * string is truncated.
2910 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
2912 struct printf_spec spec = {0};
2914 const char *args = (const char *)bin_buf;
2916 if (WARN_ON_ONCE(size > INT_MAX))
2922 #define get_arg(type) \
2924 typeof(type) value; \
2925 if (sizeof(type) == 8) { \
2926 args = PTR_ALIGN(args, sizeof(u32)); \
2927 *(u32 *)&value = *(u32 *)args; \
2928 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
2930 args = PTR_ALIGN(args, sizeof(type)); \
2931 value = *(typeof(type) *)args; \
2933 args += sizeof(type); \
2937 /* Make sure end is always >= buf */
2944 const char *old_fmt = fmt;
2945 int read = format_decode(fmt, &spec);
2949 switch (spec.type) {
2950 case FORMAT_TYPE_NONE: {
2953 if (copy > end - str)
2955 memcpy(str, old_fmt, copy);
2961 case FORMAT_TYPE_WIDTH:
2962 set_field_width(&spec, get_arg(int));
2965 case FORMAT_TYPE_PRECISION:
2966 set_precision(&spec, get_arg(int));
2969 case FORMAT_TYPE_CHAR: {
2972 if (!(spec.flags & LEFT)) {
2973 while (--spec.field_width > 0) {
2979 c = (unsigned char) get_arg(char);
2983 while (--spec.field_width > 0) {
2991 case FORMAT_TYPE_STR: {
2992 const char *str_arg = args;
2993 args += strlen(str_arg) + 1;
2994 str = string(str, end, (char *)str_arg, spec);
2998 case FORMAT_TYPE_PTR: {
2999 bool process = false;
3001 /* Non function dereferences were already done */
3012 if (!isalnum(*fmt)) {
3016 /* Pointer dereference was already processed */
3018 len = copy = strlen(args);
3019 if (copy > end - str)
3021 memcpy(str, args, copy);
3027 str = pointer(fmt, str, end, get_arg(void *), spec);
3029 while (isalnum(*fmt))
3034 case FORMAT_TYPE_PERCENT_CHAR:
3040 case FORMAT_TYPE_INVALID:
3044 unsigned long long num;
3046 switch (spec.type) {
3048 case FORMAT_TYPE_LONG_LONG:
3049 num = get_arg(long long);
3051 case FORMAT_TYPE_ULONG:
3052 case FORMAT_TYPE_LONG:
3053 num = get_arg(unsigned long);
3055 case FORMAT_TYPE_SIZE_T:
3056 num = get_arg(size_t);
3058 case FORMAT_TYPE_PTRDIFF:
3059 num = get_arg(ptrdiff_t);
3061 case FORMAT_TYPE_UBYTE:
3062 num = get_arg(unsigned char);
3064 case FORMAT_TYPE_BYTE:
3065 num = get_arg(signed char);
3067 case FORMAT_TYPE_USHORT:
3068 num = get_arg(unsigned short);
3070 case FORMAT_TYPE_SHORT:
3071 num = get_arg(short);
3073 case FORMAT_TYPE_UINT:
3074 num = get_arg(unsigned int);
3080 str = number(str, end, num, spec);
3082 } /* switch(spec.type) */
3095 /* the trailing null byte doesn't count towards the total */
3098 EXPORT_SYMBOL_GPL(bstr_printf);
3101 * bprintf - Parse a format string and place args' binary value in a buffer
3102 * @bin_buf: The buffer to place args' binary value
3103 * @size: The size of the buffer(by words(32bits), not characters)
3104 * @fmt: The format string to use
3105 * @...: Arguments for the format string
3107 * The function returns the number of words(u32) written
3110 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
3115 va_start(args, fmt);
3116 ret = vbin_printf(bin_buf, size, fmt, args);
3121 EXPORT_SYMBOL_GPL(bprintf);
3123 #endif /* CONFIG_BINARY_PRINTF */
3126 * vsscanf - Unformat a buffer into a list of arguments
3127 * @buf: input buffer
3128 * @fmt: format of buffer
3131 int vsscanf(const char *buf, const char *fmt, va_list args)
3133 const char *str = buf;
3141 unsigned long long u;
3147 /* skip any white space in format */
3148 /* white space in format matchs any amount of
3149 * white space, including none, in the input.
3151 if (isspace(*fmt)) {
3152 fmt = skip_spaces(++fmt);
3153 str = skip_spaces(str);
3156 /* anything that is not a conversion must match exactly */
3157 if (*fmt != '%' && *fmt) {
3158 if (*fmt++ != *str++)
3167 /* skip this conversion.
3168 * advance both strings to next white space
3173 while (!isspace(*fmt) && *fmt != '%' && *fmt) {
3174 /* '%*[' not yet supported, invalid format */
3179 while (!isspace(*str) && *str)
3184 /* get field width */
3186 if (isdigit(*fmt)) {
3187 field_width = skip_atoi(&fmt);
3188 if (field_width <= 0)
3192 /* get conversion qualifier */
3194 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
3197 if (unlikely(qualifier == *fmt)) {
3198 if (qualifier == 'h') {
3201 } else if (qualifier == 'l') {
3212 /* return number of characters read so far */
3213 *va_arg(args, int *) = str - buf;
3227 char *s = (char *)va_arg(args, char*);
3228 if (field_width == -1)
3232 } while (--field_width > 0 && *str);
3238 char *s = (char *)va_arg(args, char *);
3239 if (field_width == -1)
3240 field_width = SHRT_MAX;
3241 /* first, skip leading white space in buffer */
3242 str = skip_spaces(str);
3244 /* now copy until next white space */
3245 while (*str && !isspace(*str) && field_width--)
3252 * Warning: This implementation of the '[' conversion specifier
3253 * deviates from its glibc counterpart in the following ways:
3254 * (1) It does NOT support ranges i.e. '-' is NOT a special
3256 * (2) It cannot match the closing bracket ']' itself
3257 * (3) A field width is required
3258 * (4) '%*[' (discard matching input) is currently not supported
3261 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
3262 * buf1, buf2, buf3);
3268 char *s = (char *)va_arg(args, char *);
3269 DECLARE_BITMAP(set, 256) = {0};
3270 unsigned int len = 0;
3271 bool negate = (*fmt == '^');
3273 /* field width is required */
3274 if (field_width == -1)
3280 for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
3281 set_bit((u8)*fmt, set);
3283 /* no ']' or no character set found */
3289 bitmap_complement(set, set, 256);
3290 /* exclude null '\0' byte */
3294 /* match must be non-empty */
3295 if (!test_bit((u8)*str, set))
3298 while (test_bit((u8)*str, set) && field_width--)
3320 /* looking for '%' in str */
3325 /* invalid format; stop here */
3329 /* have some sort of integer conversion.
3330 * first, skip white space in buffer.
3332 str = skip_spaces(str);
3335 if (is_sign && digit == '-')
3339 || (base == 16 && !isxdigit(digit))
3340 || (base == 10 && !isdigit(digit))
3341 || (base == 8 && (!isdigit(digit) || digit > '7'))
3342 || (base == 0 && !isdigit(digit)))
3346 val.s = qualifier != 'L' ?
3347 simple_strtol(str, &next, base) :
3348 simple_strtoll(str, &next, base);
3350 val.u = qualifier != 'L' ?
3351 simple_strtoul(str, &next, base) :
3352 simple_strtoull(str, &next, base);
3354 if (field_width > 0 && next - str > field_width) {
3356 _parse_integer_fixup_radix(str, &base);
3357 while (next - str > field_width) {
3359 val.s = div_s64(val.s, base);
3361 val.u = div_u64(val.u, base);
3366 switch (qualifier) {
3367 case 'H': /* that's 'hh' in format */
3369 *va_arg(args, signed char *) = val.s;
3371 *va_arg(args, unsigned char *) = val.u;
3375 *va_arg(args, short *) = val.s;
3377 *va_arg(args, unsigned short *) = val.u;
3381 *va_arg(args, long *) = val.s;
3383 *va_arg(args, unsigned long *) = val.u;
3387 *va_arg(args, long long *) = val.s;
3389 *va_arg(args, unsigned long long *) = val.u;
3392 *va_arg(args, size_t *) = val.u;
3396 *va_arg(args, int *) = val.s;
3398 *va_arg(args, unsigned int *) = val.u;
3410 EXPORT_SYMBOL(vsscanf);
3413 * sscanf - Unformat a buffer into a list of arguments
3414 * @buf: input buffer
3415 * @fmt: formatting of buffer
3416 * @...: resulting arguments
3418 int sscanf(const char *buf, const char *fmt, ...)
3423 va_start(args, fmt);
3424 i = vsscanf(buf, fmt, args);
3429 EXPORT_SYMBOL(sscanf);