mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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b0d33c2bd7
print_symbol takes a long and converts it to a function name and offset. %pS does something similar, but doesn't translate the address via __builtin_extract_return_addr. %pSR does the translation. This will enable replacing multiple calls like printk(...); printk_symbol(addr); printk("\n"); with a single non-interleavable in dmesg printk("... %pSR\n", (void *)addr); Update documentation too. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2275 lines
53 KiB
C
2275 lines
53 KiB
C
/*
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* linux/lib/vsprintf.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
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/*
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* Wirzenius wrote this portably, Torvalds fucked it up :-)
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*/
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/*
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* Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
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* - changed to provide snprintf and vsnprintf functions
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* So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
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* - scnprintf and vscnprintf
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*/
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#include <stdarg.h>
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#include <linux/module.h> /* for KSYM_SYMBOL_LEN */
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/kernel.h>
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#include <linux/kallsyms.h>
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#include <linux/math64.h>
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#include <linux/uaccess.h>
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#include <linux/ioport.h>
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#include <net/addrconf.h>
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#include <asm/page.h> /* for PAGE_SIZE */
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#include <asm/sections.h> /* for dereference_function_descriptor() */
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#include "kstrtox.h"
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/**
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* simple_strtoull - convert a string to an unsigned long long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*
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* This function is obsolete. Please use kstrtoull instead.
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*/
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unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
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{
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unsigned long long result;
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unsigned int rv;
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cp = _parse_integer_fixup_radix(cp, &base);
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rv = _parse_integer(cp, base, &result);
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/* FIXME */
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cp += (rv & ~KSTRTOX_OVERFLOW);
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if (endp)
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*endp = (char *)cp;
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return result;
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}
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EXPORT_SYMBOL(simple_strtoull);
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/**
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* simple_strtoul - convert a string to an unsigned long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*
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* This function is obsolete. Please use kstrtoul instead.
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*/
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unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
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{
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return simple_strtoull(cp, endp, base);
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}
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EXPORT_SYMBOL(simple_strtoul);
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/**
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* simple_strtol - convert a string to a signed long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*
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* This function is obsolete. Please use kstrtol instead.
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*/
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long simple_strtol(const char *cp, char **endp, unsigned int base)
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{
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if (*cp == '-')
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return -simple_strtoul(cp + 1, endp, base);
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return simple_strtoul(cp, endp, base);
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}
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EXPORT_SYMBOL(simple_strtol);
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/**
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* simple_strtoll - convert a string to a signed long long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*
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* This function is obsolete. Please use kstrtoll instead.
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*/
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long long simple_strtoll(const char *cp, char **endp, unsigned int base)
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{
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if (*cp == '-')
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return -simple_strtoull(cp + 1, endp, base);
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return simple_strtoull(cp, endp, base);
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}
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EXPORT_SYMBOL(simple_strtoll);
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static noinline_for_stack
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int skip_atoi(const char **s)
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{
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int i = 0;
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while (isdigit(**s))
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i = i*10 + *((*s)++) - '0';
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return i;
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}
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/* Decimal conversion is by far the most typical, and is used
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* for /proc and /sys data. This directly impacts e.g. top performance
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* with many processes running. We optimize it for speed
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* using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
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* (with permission from the author, Douglas W. Jones).
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*/
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#if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
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/* Formats correctly any integer in [0, 999999999] */
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static noinline_for_stack
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char *put_dec_full9(char *buf, unsigned q)
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{
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unsigned r;
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/*
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* Possible ways to approx. divide by 10
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* (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit)
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* (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul)
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* (x * 0x6667) >> 18 x < 43699
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* (x * 0x3334) >> 17 x < 16389
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* (x * 0x199a) >> 16 x < 16389
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* (x * 0x0ccd) >> 15 x < 16389
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* (x * 0x0667) >> 14 x < 2739
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* (x * 0x0334) >> 13 x < 1029
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* (x * 0x019a) >> 12 x < 1029
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* (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386)
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* (x * 0x0067) >> 10 x < 179
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* (x * 0x0034) >> 9 x < 69 same
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* (x * 0x001a) >> 8 x < 69 same
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* (x * 0x000d) >> 7 x < 69 same, shortest code (on i386)
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* (x * 0x0007) >> 6 x < 19
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* See <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
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*/
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r = (q * (uint64_t)0x1999999a) >> 32;
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*buf++ = (q - 10 * r) + '0'; /* 1 */
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q = (r * (uint64_t)0x1999999a) >> 32;
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*buf++ = (r - 10 * q) + '0'; /* 2 */
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r = (q * (uint64_t)0x1999999a) >> 32;
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*buf++ = (q - 10 * r) + '0'; /* 3 */
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q = (r * (uint64_t)0x1999999a) >> 32;
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*buf++ = (r - 10 * q) + '0'; /* 4 */
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r = (q * (uint64_t)0x1999999a) >> 32;
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*buf++ = (q - 10 * r) + '0'; /* 5 */
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/* Now value is under 10000, can avoid 64-bit multiply */
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q = (r * 0x199a) >> 16;
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*buf++ = (r - 10 * q) + '0'; /* 6 */
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r = (q * 0xcd) >> 11;
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*buf++ = (q - 10 * r) + '0'; /* 7 */
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q = (r * 0xcd) >> 11;
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*buf++ = (r - 10 * q) + '0'; /* 8 */
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*buf++ = q + '0'; /* 9 */
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return buf;
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}
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#endif
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/* Similar to above but do not pad with zeros.
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* Code can be easily arranged to print 9 digits too, but our callers
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* always call put_dec_full9() instead when the number has 9 decimal digits.
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*/
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static noinline_for_stack
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char *put_dec_trunc8(char *buf, unsigned r)
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{
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unsigned q;
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/* Copy of previous function's body with added early returns */
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while (r >= 10000) {
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q = r + '0';
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r = (r * (uint64_t)0x1999999a) >> 32;
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*buf++ = q - 10*r;
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}
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q = (r * 0x199a) >> 16; /* r <= 9999 */
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*buf++ = (r - 10 * q) + '0';
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if (q == 0)
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return buf;
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r = (q * 0xcd) >> 11; /* q <= 999 */
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*buf++ = (q - 10 * r) + '0';
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if (r == 0)
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return buf;
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q = (r * 0xcd) >> 11; /* r <= 99 */
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*buf++ = (r - 10 * q) + '0';
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if (q == 0)
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return buf;
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*buf++ = q + '0'; /* q <= 9 */
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return buf;
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}
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/* There are two algorithms to print larger numbers.
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* One is generic: divide by 1000000000 and repeatedly print
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* groups of (up to) 9 digits. It's conceptually simple,
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* but requires a (unsigned long long) / 1000000000 division.
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*
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* Second algorithm splits 64-bit unsigned long long into 16-bit chunks,
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* manipulates them cleverly and generates groups of 4 decimal digits.
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* It so happens that it does NOT require long long division.
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*
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* If long is > 32 bits, division of 64-bit values is relatively easy,
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* and we will use the first algorithm.
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* If long long is > 64 bits (strange architecture with VERY large long long),
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* second algorithm can't be used, and we again use the first one.
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*
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* Else (if long is 32 bits and long long is 64 bits) we use second one.
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*/
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#if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
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/* First algorithm: generic */
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static
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char *put_dec(char *buf, unsigned long long n)
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{
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if (n >= 100*1000*1000) {
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while (n >= 1000*1000*1000)
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buf = put_dec_full9(buf, do_div(n, 1000*1000*1000));
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if (n >= 100*1000*1000)
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return put_dec_full9(buf, n);
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}
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return put_dec_trunc8(buf, n);
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}
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#else
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/* Second algorithm: valid only for 64-bit long longs */
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/* See comment in put_dec_full9 for choice of constants */
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static noinline_for_stack
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void put_dec_full4(char *buf, unsigned q)
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{
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unsigned r;
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r = (q * 0xccd) >> 15;
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buf[0] = (q - 10 * r) + '0';
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q = (r * 0xcd) >> 11;
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buf[1] = (r - 10 * q) + '0';
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r = (q * 0xcd) >> 11;
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buf[2] = (q - 10 * r) + '0';
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buf[3] = r + '0';
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}
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/*
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* Call put_dec_full4 on x % 10000, return x / 10000.
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* The approximation x/10000 == (x * 0x346DC5D7) >> 43
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* holds for all x < 1,128,869,999. The largest value this
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* helper will ever be asked to convert is 1,125,520,955.
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* (d1 in the put_dec code, assuming n is all-ones).
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*/
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static
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unsigned put_dec_helper4(char *buf, unsigned x)
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{
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uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
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put_dec_full4(buf, x - q * 10000);
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return q;
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}
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/* Based on code by Douglas W. Jones found at
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* <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
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* (with permission from the author).
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* Performs no 64-bit division and hence should be fast on 32-bit machines.
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*/
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static
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char *put_dec(char *buf, unsigned long long n)
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{
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uint32_t d3, d2, d1, q, h;
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if (n < 100*1000*1000)
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return put_dec_trunc8(buf, n);
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d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
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h = (n >> 32);
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d2 = (h ) & 0xffff;
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d3 = (h >> 16); /* implicit "& 0xffff" */
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q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
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q = put_dec_helper4(buf, q);
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q += 7671 * d3 + 9496 * d2 + 6 * d1;
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q = put_dec_helper4(buf+4, q);
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q += 4749 * d3 + 42 * d2;
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q = put_dec_helper4(buf+8, q);
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q += 281 * d3;
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buf += 12;
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if (q)
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buf = put_dec_trunc8(buf, q);
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else while (buf[-1] == '0')
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--buf;
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return buf;
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}
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#endif
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/*
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* Convert passed number to decimal string.
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* Returns the length of string. On buffer overflow, returns 0.
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*
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* If speed is not important, use snprintf(). It's easy to read the code.
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*/
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int num_to_str(char *buf, int size, unsigned long long num)
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{
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char tmp[sizeof(num) * 3];
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int idx, len;
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/* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
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if (num <= 9) {
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tmp[0] = '0' + num;
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len = 1;
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} else {
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len = put_dec(tmp, num) - tmp;
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}
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if (len > size)
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return 0;
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for (idx = 0; idx < len; ++idx)
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buf[idx] = tmp[len - idx - 1];
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return len;
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}
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#define ZEROPAD 1 /* pad with zero */
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#define SIGN 2 /* unsigned/signed long */
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#define PLUS 4 /* show plus */
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#define SPACE 8 /* space if plus */
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#define LEFT 16 /* left justified */
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#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
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#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
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enum format_type {
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FORMAT_TYPE_NONE, /* Just a string part */
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FORMAT_TYPE_WIDTH,
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FORMAT_TYPE_PRECISION,
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FORMAT_TYPE_CHAR,
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FORMAT_TYPE_STR,
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FORMAT_TYPE_PTR,
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FORMAT_TYPE_PERCENT_CHAR,
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FORMAT_TYPE_INVALID,
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FORMAT_TYPE_LONG_LONG,
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FORMAT_TYPE_ULONG,
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FORMAT_TYPE_LONG,
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FORMAT_TYPE_UBYTE,
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FORMAT_TYPE_BYTE,
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FORMAT_TYPE_USHORT,
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FORMAT_TYPE_SHORT,
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FORMAT_TYPE_UINT,
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FORMAT_TYPE_INT,
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FORMAT_TYPE_NRCHARS,
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FORMAT_TYPE_SIZE_T,
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FORMAT_TYPE_PTRDIFF
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};
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struct printf_spec {
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u8 type; /* format_type enum */
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u8 flags; /* flags to number() */
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u8 base; /* number base, 8, 10 or 16 only */
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u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
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s16 field_width; /* width of output field */
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s16 precision; /* # of digits/chars */
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};
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static noinline_for_stack
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char *number(char *buf, char *end, unsigned long long num,
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struct printf_spec spec)
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{
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/* we are called with base 8, 10 or 16, only, thus don't need "G..." */
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static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
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char tmp[66];
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char sign;
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char locase;
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int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
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int i;
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bool is_zero = num == 0LL;
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/* locase = 0 or 0x20. ORing digits or letters with 'locase'
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* produces same digits or (maybe lowercased) letters */
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locase = (spec.flags & SMALL);
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if (spec.flags & LEFT)
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spec.flags &= ~ZEROPAD;
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sign = 0;
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if (spec.flags & SIGN) {
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if ((signed long long)num < 0) {
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sign = '-';
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num = -(signed long long)num;
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spec.field_width--;
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} else if (spec.flags & PLUS) {
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sign = '+';
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spec.field_width--;
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} else if (spec.flags & SPACE) {
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sign = ' ';
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spec.field_width--;
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}
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}
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if (need_pfx) {
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if (spec.base == 16)
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spec.field_width -= 2;
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else if (!is_zero)
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spec.field_width--;
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}
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|
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/* generate full string in tmp[], in reverse order */
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i = 0;
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if (num < spec.base)
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tmp[i++] = digits[num] | locase;
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/* Generic code, for any base:
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else do {
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tmp[i++] = (digits[do_div(num,base)] | locase);
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} while (num != 0);
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*/
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else if (spec.base != 10) { /* 8 or 16 */
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int mask = spec.base - 1;
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int shift = 3;
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|
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if (spec.base == 16)
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shift = 4;
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do {
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tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
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num >>= shift;
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} while (num);
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} else { /* base 10 */
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i = put_dec(tmp, num) - tmp;
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}
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|
|
/* printing 100 using %2d gives "100", not "00" */
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if (i > spec.precision)
|
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spec.precision = i;
|
|
/* leading space padding */
|
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spec.field_width -= spec.precision;
|
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if (!(spec.flags & (ZEROPAD+LEFT))) {
|
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while (--spec.field_width >= 0) {
|
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if (buf < end)
|
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*buf = ' ';
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|
++buf;
|
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}
|
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}
|
|
/* sign */
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if (sign) {
|
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if (buf < end)
|
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*buf = sign;
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++buf;
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}
|
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/* "0x" / "0" prefix */
|
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if (need_pfx) {
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if (spec.base == 16 || !is_zero) {
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if (buf < end)
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*buf = '0';
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++buf;
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}
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if (spec.base == 16) {
|
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if (buf < end)
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*buf = ('X' | locase);
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++buf;
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}
|
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}
|
|
/* zero or space padding */
|
|
if (!(spec.flags & LEFT)) {
|
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char c = (spec.flags & ZEROPAD) ? '0' : ' ';
|
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while (--spec.field_width >= 0) {
|
|
if (buf < end)
|
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*buf = c;
|
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++buf;
|
|
}
|
|
}
|
|
/* hmm even more zero padding? */
|
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while (i <= --spec.precision) {
|
|
if (buf < end)
|
|
*buf = '0';
|
|
++buf;
|
|
}
|
|
/* actual digits of result */
|
|
while (--i >= 0) {
|
|
if (buf < end)
|
|
*buf = tmp[i];
|
|
++buf;
|
|
}
|
|
/* trailing space padding */
|
|
while (--spec.field_width >= 0) {
|
|
if (buf < end)
|
|
*buf = ' ';
|
|
++buf;
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *string(char *buf, char *end, const char *s, struct printf_spec spec)
|
|
{
|
|
int len, i;
|
|
|
|
if ((unsigned long)s < PAGE_SIZE)
|
|
s = "(null)";
|
|
|
|
len = strnlen(s, spec.precision);
|
|
|
|
if (!(spec.flags & LEFT)) {
|
|
while (len < spec.field_width--) {
|
|
if (buf < end)
|
|
*buf = ' ';
|
|
++buf;
|
|
}
|
|
}
|
|
for (i = 0; i < len; ++i) {
|
|
if (buf < end)
|
|
*buf = *s;
|
|
++buf; ++s;
|
|
}
|
|
while (len < spec.field_width--) {
|
|
if (buf < end)
|
|
*buf = ' ';
|
|
++buf;
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *symbol_string(char *buf, char *end, void *ptr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
unsigned long value;
|
|
#ifdef CONFIG_KALLSYMS
|
|
char sym[KSYM_SYMBOL_LEN];
|
|
#endif
|
|
|
|
if (fmt[1] == 'R')
|
|
ptr = __builtin_extract_return_addr(ptr);
|
|
value = (unsigned long)ptr;
|
|
|
|
#ifdef CONFIG_KALLSYMS
|
|
if (*fmt == 'B')
|
|
sprint_backtrace(sym, value);
|
|
else if (*fmt != 'f' && *fmt != 's')
|
|
sprint_symbol(sym, value);
|
|
else
|
|
sprint_symbol_no_offset(sym, value);
|
|
|
|
return string(buf, end, sym, spec);
|
|
#else
|
|
spec.field_width = 2 * sizeof(void *);
|
|
spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
|
spec.base = 16;
|
|
|
|
return number(buf, end, value, spec);
|
|
#endif
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *resource_string(char *buf, char *end, struct resource *res,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
#ifndef IO_RSRC_PRINTK_SIZE
|
|
#define IO_RSRC_PRINTK_SIZE 6
|
|
#endif
|
|
|
|
#ifndef MEM_RSRC_PRINTK_SIZE
|
|
#define MEM_RSRC_PRINTK_SIZE 10
|
|
#endif
|
|
static const struct printf_spec io_spec = {
|
|
.base = 16,
|
|
.field_width = IO_RSRC_PRINTK_SIZE,
|
|
.precision = -1,
|
|
.flags = SPECIAL | SMALL | ZEROPAD,
|
|
};
|
|
static const struct printf_spec mem_spec = {
|
|
.base = 16,
|
|
.field_width = MEM_RSRC_PRINTK_SIZE,
|
|
.precision = -1,
|
|
.flags = SPECIAL | SMALL | ZEROPAD,
|
|
};
|
|
static const struct printf_spec bus_spec = {
|
|
.base = 16,
|
|
.field_width = 2,
|
|
.precision = -1,
|
|
.flags = SMALL | ZEROPAD,
|
|
};
|
|
static const struct printf_spec dec_spec = {
|
|
.base = 10,
|
|
.precision = -1,
|
|
.flags = 0,
|
|
};
|
|
static const struct printf_spec str_spec = {
|
|
.field_width = -1,
|
|
.precision = 10,
|
|
.flags = LEFT,
|
|
};
|
|
static const struct printf_spec flag_spec = {
|
|
.base = 16,
|
|
.precision = -1,
|
|
.flags = SPECIAL | SMALL,
|
|
};
|
|
|
|
/* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
|
|
* 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
|
|
#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
|
|
#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
|
|
#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
|
|
#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
|
|
char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
|
|
2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
|
|
|
|
char *p = sym, *pend = sym + sizeof(sym);
|
|
int decode = (fmt[0] == 'R') ? 1 : 0;
|
|
const struct printf_spec *specp;
|
|
|
|
*p++ = '[';
|
|
if (res->flags & IORESOURCE_IO) {
|
|
p = string(p, pend, "io ", str_spec);
|
|
specp = &io_spec;
|
|
} else if (res->flags & IORESOURCE_MEM) {
|
|
p = string(p, pend, "mem ", str_spec);
|
|
specp = &mem_spec;
|
|
} else if (res->flags & IORESOURCE_IRQ) {
|
|
p = string(p, pend, "irq ", str_spec);
|
|
specp = &dec_spec;
|
|
} else if (res->flags & IORESOURCE_DMA) {
|
|
p = string(p, pend, "dma ", str_spec);
|
|
specp = &dec_spec;
|
|
} else if (res->flags & IORESOURCE_BUS) {
|
|
p = string(p, pend, "bus ", str_spec);
|
|
specp = &bus_spec;
|
|
} else {
|
|
p = string(p, pend, "??? ", str_spec);
|
|
specp = &mem_spec;
|
|
decode = 0;
|
|
}
|
|
p = number(p, pend, res->start, *specp);
|
|
if (res->start != res->end) {
|
|
*p++ = '-';
|
|
p = number(p, pend, res->end, *specp);
|
|
}
|
|
if (decode) {
|
|
if (res->flags & IORESOURCE_MEM_64)
|
|
p = string(p, pend, " 64bit", str_spec);
|
|
if (res->flags & IORESOURCE_PREFETCH)
|
|
p = string(p, pend, " pref", str_spec);
|
|
if (res->flags & IORESOURCE_WINDOW)
|
|
p = string(p, pend, " window", str_spec);
|
|
if (res->flags & IORESOURCE_DISABLED)
|
|
p = string(p, pend, " disabled", str_spec);
|
|
} else {
|
|
p = string(p, pend, " flags ", str_spec);
|
|
p = number(p, pend, res->flags, flag_spec);
|
|
}
|
|
*p++ = ']';
|
|
*p = '\0';
|
|
|
|
return string(buf, end, sym, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
|
|
const char *fmt)
|
|
{
|
|
int i, len = 1; /* if we pass '%ph[CDN]', field witdh remains
|
|
negative value, fallback to the default */
|
|
char separator;
|
|
|
|
if (spec.field_width == 0)
|
|
/* nothing to print */
|
|
return buf;
|
|
|
|
if (ZERO_OR_NULL_PTR(addr))
|
|
/* NULL pointer */
|
|
return string(buf, end, NULL, spec);
|
|
|
|
switch (fmt[1]) {
|
|
case 'C':
|
|
separator = ':';
|
|
break;
|
|
case 'D':
|
|
separator = '-';
|
|
break;
|
|
case 'N':
|
|
separator = 0;
|
|
break;
|
|
default:
|
|
separator = ' ';
|
|
break;
|
|
}
|
|
|
|
if (spec.field_width > 0)
|
|
len = min_t(int, spec.field_width, 64);
|
|
|
|
for (i = 0; i < len && buf < end - 1; i++) {
|
|
buf = hex_byte_pack(buf, addr[i]);
|
|
|
|
if (buf < end && separator && i != len - 1)
|
|
*buf++ = separator;
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *mac_address_string(char *buf, char *end, u8 *addr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
|
|
char *p = mac_addr;
|
|
int i;
|
|
char separator;
|
|
bool reversed = false;
|
|
|
|
switch (fmt[1]) {
|
|
case 'F':
|
|
separator = '-';
|
|
break;
|
|
|
|
case 'R':
|
|
reversed = true;
|
|
/* fall through */
|
|
|
|
default:
|
|
separator = ':';
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < 6; i++) {
|
|
if (reversed)
|
|
p = hex_byte_pack(p, addr[5 - i]);
|
|
else
|
|
p = hex_byte_pack(p, addr[i]);
|
|
|
|
if (fmt[0] == 'M' && i != 5)
|
|
*p++ = separator;
|
|
}
|
|
*p = '\0';
|
|
|
|
return string(buf, end, mac_addr, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip4_string(char *p, const u8 *addr, const char *fmt)
|
|
{
|
|
int i;
|
|
bool leading_zeros = (fmt[0] == 'i');
|
|
int index;
|
|
int step;
|
|
|
|
switch (fmt[2]) {
|
|
case 'h':
|
|
#ifdef __BIG_ENDIAN
|
|
index = 0;
|
|
step = 1;
|
|
#else
|
|
index = 3;
|
|
step = -1;
|
|
#endif
|
|
break;
|
|
case 'l':
|
|
index = 3;
|
|
step = -1;
|
|
break;
|
|
case 'n':
|
|
case 'b':
|
|
default:
|
|
index = 0;
|
|
step = 1;
|
|
break;
|
|
}
|
|
for (i = 0; i < 4; i++) {
|
|
char temp[3]; /* hold each IP quad in reverse order */
|
|
int digits = put_dec_trunc8(temp, addr[index]) - temp;
|
|
if (leading_zeros) {
|
|
if (digits < 3)
|
|
*p++ = '0';
|
|
if (digits < 2)
|
|
*p++ = '0';
|
|
}
|
|
/* reverse the digits in the quad */
|
|
while (digits--)
|
|
*p++ = temp[digits];
|
|
if (i < 3)
|
|
*p++ = '.';
|
|
index += step;
|
|
}
|
|
*p = '\0';
|
|
|
|
return p;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip6_compressed_string(char *p, const char *addr)
|
|
{
|
|
int i, j, range;
|
|
unsigned char zerolength[8];
|
|
int longest = 1;
|
|
int colonpos = -1;
|
|
u16 word;
|
|
u8 hi, lo;
|
|
bool needcolon = false;
|
|
bool useIPv4;
|
|
struct in6_addr in6;
|
|
|
|
memcpy(&in6, addr, sizeof(struct in6_addr));
|
|
|
|
useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
|
|
|
|
memset(zerolength, 0, sizeof(zerolength));
|
|
|
|
if (useIPv4)
|
|
range = 6;
|
|
else
|
|
range = 8;
|
|
|
|
/* find position of longest 0 run */
|
|
for (i = 0; i < range; i++) {
|
|
for (j = i; j < range; j++) {
|
|
if (in6.s6_addr16[j] != 0)
|
|
break;
|
|
zerolength[i]++;
|
|
}
|
|
}
|
|
for (i = 0; i < range; i++) {
|
|
if (zerolength[i] > longest) {
|
|
longest = zerolength[i];
|
|
colonpos = i;
|
|
}
|
|
}
|
|
if (longest == 1) /* don't compress a single 0 */
|
|
colonpos = -1;
|
|
|
|
/* emit address */
|
|
for (i = 0; i < range; i++) {
|
|
if (i == colonpos) {
|
|
if (needcolon || i == 0)
|
|
*p++ = ':';
|
|
*p++ = ':';
|
|
needcolon = false;
|
|
i += longest - 1;
|
|
continue;
|
|
}
|
|
if (needcolon) {
|
|
*p++ = ':';
|
|
needcolon = false;
|
|
}
|
|
/* hex u16 without leading 0s */
|
|
word = ntohs(in6.s6_addr16[i]);
|
|
hi = word >> 8;
|
|
lo = word & 0xff;
|
|
if (hi) {
|
|
if (hi > 0x0f)
|
|
p = hex_byte_pack(p, hi);
|
|
else
|
|
*p++ = hex_asc_lo(hi);
|
|
p = hex_byte_pack(p, lo);
|
|
}
|
|
else if (lo > 0x0f)
|
|
p = hex_byte_pack(p, lo);
|
|
else
|
|
*p++ = hex_asc_lo(lo);
|
|
needcolon = true;
|
|
}
|
|
|
|
if (useIPv4) {
|
|
if (needcolon)
|
|
*p++ = ':';
|
|
p = ip4_string(p, &in6.s6_addr[12], "I4");
|
|
}
|
|
*p = '\0';
|
|
|
|
return p;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip6_string(char *p, const char *addr, const char *fmt)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
p = hex_byte_pack(p, *addr++);
|
|
p = hex_byte_pack(p, *addr++);
|
|
if (fmt[0] == 'I' && i != 7)
|
|
*p++ = ':';
|
|
}
|
|
*p = '\0';
|
|
|
|
return p;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip6_addr_string(char *buf, char *end, const u8 *addr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
|
|
|
|
if (fmt[0] == 'I' && fmt[2] == 'c')
|
|
ip6_compressed_string(ip6_addr, addr);
|
|
else
|
|
ip6_string(ip6_addr, addr, fmt);
|
|
|
|
return string(buf, end, ip6_addr, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip4_addr_string(char *buf, char *end, const u8 *addr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char ip4_addr[sizeof("255.255.255.255")];
|
|
|
|
ip4_string(ip4_addr, addr, fmt);
|
|
|
|
return string(buf, end, ip4_addr, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *uuid_string(char *buf, char *end, const u8 *addr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
|
|
char *p = uuid;
|
|
int i;
|
|
static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
|
|
static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
|
|
const u8 *index = be;
|
|
bool uc = false;
|
|
|
|
switch (*(++fmt)) {
|
|
case 'L':
|
|
uc = true; /* fall-through */
|
|
case 'l':
|
|
index = le;
|
|
break;
|
|
case 'B':
|
|
uc = true;
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
p = hex_byte_pack(p, addr[index[i]]);
|
|
switch (i) {
|
|
case 3:
|
|
case 5:
|
|
case 7:
|
|
case 9:
|
|
*p++ = '-';
|
|
break;
|
|
}
|
|
}
|
|
|
|
*p = 0;
|
|
|
|
if (uc) {
|
|
p = uuid;
|
|
do {
|
|
*p = toupper(*p);
|
|
} while (*(++p));
|
|
}
|
|
|
|
return string(buf, end, uuid, spec);
|
|
}
|
|
|
|
static
|
|
char *netdev_feature_string(char *buf, char *end, const u8 *addr,
|
|
struct printf_spec spec)
|
|
{
|
|
spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
|
if (spec.field_width == -1)
|
|
spec.field_width = 2 + 2 * sizeof(netdev_features_t);
|
|
spec.base = 16;
|
|
|
|
return number(buf, end, *(const netdev_features_t *)addr, spec);
|
|
}
|
|
|
|
int kptr_restrict __read_mostly;
|
|
|
|
/*
|
|
* Show a '%p' thing. A kernel extension is that the '%p' is followed
|
|
* by an extra set of alphanumeric characters that are extended format
|
|
* specifiers.
|
|
*
|
|
* Right now we handle:
|
|
*
|
|
* - 'F' For symbolic function descriptor pointers with offset
|
|
* - 'f' For simple symbolic function names without offset
|
|
* - 'S' For symbolic direct pointers with offset
|
|
* - 's' For symbolic direct pointers without offset
|
|
* - '[FfSs]R' as above with __builtin_extract_return_addr() translation
|
|
* - 'B' For backtraced symbolic direct pointers with offset
|
|
* - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
|
|
* - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
|
|
* - 'M' For a 6-byte MAC address, it prints the address in the
|
|
* usual colon-separated hex notation
|
|
* - 'm' For a 6-byte MAC address, it prints the hex address without colons
|
|
* - 'MF' For a 6-byte MAC FDDI address, it prints the address
|
|
* with a dash-separated hex notation
|
|
* - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
|
|
* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
|
|
* IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
|
|
* IPv6 uses colon separated network-order 16 bit hex with leading 0's
|
|
* - 'i' [46] for 'raw' IPv4/IPv6 addresses
|
|
* IPv6 omits the colons (01020304...0f)
|
|
* IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
|
|
* - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
|
|
* - 'I6c' for IPv6 addresses printed as specified by
|
|
* http://tools.ietf.org/html/rfc5952
|
|
* - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
|
|
* "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
|
|
* Options for %pU are:
|
|
* b big endian lower case hex (default)
|
|
* B big endian UPPER case hex
|
|
* l little endian lower case hex
|
|
* L little endian UPPER case hex
|
|
* big endian output byte order is:
|
|
* [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
|
|
* little endian output byte order is:
|
|
* [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
|
|
* - 'V' For a struct va_format which contains a format string * and va_list *,
|
|
* call vsnprintf(->format, *->va_list).
|
|
* Implements a "recursive vsnprintf".
|
|
* Do not use this feature without some mechanism to verify the
|
|
* correctness of the format string and va_list arguments.
|
|
* - 'K' For a kernel pointer that should be hidden from unprivileged users
|
|
* - 'NF' For a netdev_features_t
|
|
* - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
|
|
* a certain separator (' ' by default):
|
|
* C colon
|
|
* D dash
|
|
* N no separator
|
|
* The maximum supported length is 64 bytes of the input. Consider
|
|
* to use print_hex_dump() for the larger input.
|
|
* - 'a' For a phys_addr_t type and its derivative types (passed by reference)
|
|
*
|
|
* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
|
|
* function pointers are really function descriptors, which contain a
|
|
* pointer to the real address.
|
|
*/
|
|
static noinline_for_stack
|
|
char *pointer(const char *fmt, char *buf, char *end, void *ptr,
|
|
struct printf_spec spec)
|
|
{
|
|
int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0);
|
|
|
|
if (!ptr && *fmt != 'K') {
|
|
/*
|
|
* Print (null) with the same width as a pointer so it makes
|
|
* tabular output look nice.
|
|
*/
|
|
if (spec.field_width == -1)
|
|
spec.field_width = default_width;
|
|
return string(buf, end, "(null)", spec);
|
|
}
|
|
|
|
switch (*fmt) {
|
|
case 'F':
|
|
case 'f':
|
|
ptr = dereference_function_descriptor(ptr);
|
|
/* Fallthrough */
|
|
case 'S':
|
|
case 's':
|
|
case 'B':
|
|
return symbol_string(buf, end, ptr, spec, fmt);
|
|
case 'R':
|
|
case 'r':
|
|
return resource_string(buf, end, ptr, spec, fmt);
|
|
case 'h':
|
|
return hex_string(buf, end, ptr, spec, fmt);
|
|
case 'M': /* Colon separated: 00:01:02:03:04:05 */
|
|
case 'm': /* Contiguous: 000102030405 */
|
|
/* [mM]F (FDDI) */
|
|
/* [mM]R (Reverse order; Bluetooth) */
|
|
return mac_address_string(buf, end, ptr, spec, fmt);
|
|
case 'I': /* Formatted IP supported
|
|
* 4: 1.2.3.4
|
|
* 6: 0001:0203:...:0708
|
|
* 6c: 1::708 or 1::1.2.3.4
|
|
*/
|
|
case 'i': /* Contiguous:
|
|
* 4: 001.002.003.004
|
|
* 6: 000102...0f
|
|
*/
|
|
switch (fmt[1]) {
|
|
case '6':
|
|
return ip6_addr_string(buf, end, ptr, spec, fmt);
|
|
case '4':
|
|
return ip4_addr_string(buf, end, ptr, spec, fmt);
|
|
}
|
|
break;
|
|
case 'U':
|
|
return uuid_string(buf, end, ptr, spec, fmt);
|
|
case 'V':
|
|
{
|
|
va_list va;
|
|
|
|
va_copy(va, *((struct va_format *)ptr)->va);
|
|
buf += vsnprintf(buf, end > buf ? end - buf : 0,
|
|
((struct va_format *)ptr)->fmt, va);
|
|
va_end(va);
|
|
return buf;
|
|
}
|
|
case 'K':
|
|
/*
|
|
* %pK cannot be used in IRQ context because its test
|
|
* for CAP_SYSLOG would be meaningless.
|
|
*/
|
|
if (kptr_restrict && (in_irq() || in_serving_softirq() ||
|
|
in_nmi())) {
|
|
if (spec.field_width == -1)
|
|
spec.field_width = default_width;
|
|
return string(buf, end, "pK-error", spec);
|
|
}
|
|
if (!((kptr_restrict == 0) ||
|
|
(kptr_restrict == 1 &&
|
|
has_capability_noaudit(current, CAP_SYSLOG))))
|
|
ptr = NULL;
|
|
break;
|
|
case 'N':
|
|
switch (fmt[1]) {
|
|
case 'F':
|
|
return netdev_feature_string(buf, end, ptr, spec);
|
|
}
|
|
break;
|
|
case 'a':
|
|
spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
|
spec.field_width = sizeof(phys_addr_t) * 2 + 2;
|
|
spec.base = 16;
|
|
return number(buf, end,
|
|
(unsigned long long) *((phys_addr_t *)ptr), spec);
|
|
}
|
|
spec.flags |= SMALL;
|
|
if (spec.field_width == -1) {
|
|
spec.field_width = default_width;
|
|
spec.flags |= ZEROPAD;
|
|
}
|
|
spec.base = 16;
|
|
|
|
return number(buf, end, (unsigned long) ptr, spec);
|
|
}
|
|
|
|
/*
|
|
* Helper function to decode printf style format.
|
|
* Each call decode a token from the format and return the
|
|
* number of characters read (or likely the delta where it wants
|
|
* to go on the next call).
|
|
* The decoded token is returned through the parameters
|
|
*
|
|
* 'h', 'l', or 'L' for integer fields
|
|
* 'z' support added 23/7/1999 S.H.
|
|
* 'z' changed to 'Z' --davidm 1/25/99
|
|
* 't' added for ptrdiff_t
|
|
*
|
|
* @fmt: the format string
|
|
* @type of the token returned
|
|
* @flags: various flags such as +, -, # tokens..
|
|
* @field_width: overwritten width
|
|
* @base: base of the number (octal, hex, ...)
|
|
* @precision: precision of a number
|
|
* @qualifier: qualifier of a number (long, size_t, ...)
|
|
*/
|
|
static noinline_for_stack
|
|
int format_decode(const char *fmt, struct printf_spec *spec)
|
|
{
|
|
const char *start = fmt;
|
|
|
|
/* we finished early by reading the field width */
|
|
if (spec->type == FORMAT_TYPE_WIDTH) {
|
|
if (spec->field_width < 0) {
|
|
spec->field_width = -spec->field_width;
|
|
spec->flags |= LEFT;
|
|
}
|
|
spec->type = FORMAT_TYPE_NONE;
|
|
goto precision;
|
|
}
|
|
|
|
/* we finished early by reading the precision */
|
|
if (spec->type == FORMAT_TYPE_PRECISION) {
|
|
if (spec->precision < 0)
|
|
spec->precision = 0;
|
|
|
|
spec->type = FORMAT_TYPE_NONE;
|
|
goto qualifier;
|
|
}
|
|
|
|
/* By default */
|
|
spec->type = FORMAT_TYPE_NONE;
|
|
|
|
for (; *fmt ; ++fmt) {
|
|
if (*fmt == '%')
|
|
break;
|
|
}
|
|
|
|
/* Return the current non-format string */
|
|
if (fmt != start || !*fmt)
|
|
return fmt - start;
|
|
|
|
/* Process flags */
|
|
spec->flags = 0;
|
|
|
|
while (1) { /* this also skips first '%' */
|
|
bool found = true;
|
|
|
|
++fmt;
|
|
|
|
switch (*fmt) {
|
|
case '-': spec->flags |= LEFT; break;
|
|
case '+': spec->flags |= PLUS; break;
|
|
case ' ': spec->flags |= SPACE; break;
|
|
case '#': spec->flags |= SPECIAL; break;
|
|
case '0': spec->flags |= ZEROPAD; break;
|
|
default: found = false;
|
|
}
|
|
|
|
if (!found)
|
|
break;
|
|
}
|
|
|
|
/* get field width */
|
|
spec->field_width = -1;
|
|
|
|
if (isdigit(*fmt))
|
|
spec->field_width = skip_atoi(&fmt);
|
|
else if (*fmt == '*') {
|
|
/* it's the next argument */
|
|
spec->type = FORMAT_TYPE_WIDTH;
|
|
return ++fmt - start;
|
|
}
|
|
|
|
precision:
|
|
/* get the precision */
|
|
spec->precision = -1;
|
|
if (*fmt == '.') {
|
|
++fmt;
|
|
if (isdigit(*fmt)) {
|
|
spec->precision = skip_atoi(&fmt);
|
|
if (spec->precision < 0)
|
|
spec->precision = 0;
|
|
} else if (*fmt == '*') {
|
|
/* it's the next argument */
|
|
spec->type = FORMAT_TYPE_PRECISION;
|
|
return ++fmt - start;
|
|
}
|
|
}
|
|
|
|
qualifier:
|
|
/* get the conversion qualifier */
|
|
spec->qualifier = -1;
|
|
if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
|
|
_tolower(*fmt) == 'z' || *fmt == 't') {
|
|
spec->qualifier = *fmt++;
|
|
if (unlikely(spec->qualifier == *fmt)) {
|
|
if (spec->qualifier == 'l') {
|
|
spec->qualifier = 'L';
|
|
++fmt;
|
|
} else if (spec->qualifier == 'h') {
|
|
spec->qualifier = 'H';
|
|
++fmt;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* default base */
|
|
spec->base = 10;
|
|
switch (*fmt) {
|
|
case 'c':
|
|
spec->type = FORMAT_TYPE_CHAR;
|
|
return ++fmt - start;
|
|
|
|
case 's':
|
|
spec->type = FORMAT_TYPE_STR;
|
|
return ++fmt - start;
|
|
|
|
case 'p':
|
|
spec->type = FORMAT_TYPE_PTR;
|
|
return fmt - start;
|
|
/* skip alnum */
|
|
|
|
case 'n':
|
|
spec->type = FORMAT_TYPE_NRCHARS;
|
|
return ++fmt - start;
|
|
|
|
case '%':
|
|
spec->type = FORMAT_TYPE_PERCENT_CHAR;
|
|
return ++fmt - start;
|
|
|
|
/* integer number formats - set up the flags and "break" */
|
|
case 'o':
|
|
spec->base = 8;
|
|
break;
|
|
|
|
case 'x':
|
|
spec->flags |= SMALL;
|
|
|
|
case 'X':
|
|
spec->base = 16;
|
|
break;
|
|
|
|
case 'd':
|
|
case 'i':
|
|
spec->flags |= SIGN;
|
|
case 'u':
|
|
break;
|
|
|
|
default:
|
|
spec->type = FORMAT_TYPE_INVALID;
|
|
return fmt - start;
|
|
}
|
|
|
|
if (spec->qualifier == 'L')
|
|
spec->type = FORMAT_TYPE_LONG_LONG;
|
|
else if (spec->qualifier == 'l') {
|
|
if (spec->flags & SIGN)
|
|
spec->type = FORMAT_TYPE_LONG;
|
|
else
|
|
spec->type = FORMAT_TYPE_ULONG;
|
|
} else if (_tolower(spec->qualifier) == 'z') {
|
|
spec->type = FORMAT_TYPE_SIZE_T;
|
|
} else if (spec->qualifier == 't') {
|
|
spec->type = FORMAT_TYPE_PTRDIFF;
|
|
} else if (spec->qualifier == 'H') {
|
|
if (spec->flags & SIGN)
|
|
spec->type = FORMAT_TYPE_BYTE;
|
|
else
|
|
spec->type = FORMAT_TYPE_UBYTE;
|
|
} else if (spec->qualifier == 'h') {
|
|
if (spec->flags & SIGN)
|
|
spec->type = FORMAT_TYPE_SHORT;
|
|
else
|
|
spec->type = FORMAT_TYPE_USHORT;
|
|
} else {
|
|
if (spec->flags & SIGN)
|
|
spec->type = FORMAT_TYPE_INT;
|
|
else
|
|
spec->type = FORMAT_TYPE_UINT;
|
|
}
|
|
|
|
return ++fmt - start;
|
|
}
|
|
|
|
/**
|
|
* vsnprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @size: The size of the buffer, including the trailing null space
|
|
* @fmt: The format string to use
|
|
* @args: Arguments for the format string
|
|
*
|
|
* This function follows C99 vsnprintf, but has some extensions:
|
|
* %pS output the name of a text symbol with offset
|
|
* %ps output the name of a text symbol without offset
|
|
* %pF output the name of a function pointer with its offset
|
|
* %pf output the name of a function pointer without its offset
|
|
* %pB output the name of a backtrace symbol with its offset
|
|
* %pR output the address range in a struct resource with decoded flags
|
|
* %pr output the address range in a struct resource with raw flags
|
|
* %pM output a 6-byte MAC address with colons
|
|
* %pMR output a 6-byte MAC address with colons in reversed order
|
|
* %pMF output a 6-byte MAC address with dashes
|
|
* %pm output a 6-byte MAC address without colons
|
|
* %pmR output a 6-byte MAC address without colons in reversed order
|
|
* %pI4 print an IPv4 address without leading zeros
|
|
* %pi4 print an IPv4 address with leading zeros
|
|
* %pI6 print an IPv6 address with colons
|
|
* %pi6 print an IPv6 address without colons
|
|
* %pI6c print an IPv6 address as specified by RFC 5952
|
|
* %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
|
|
* case.
|
|
* %*ph[CDN] a variable-length hex string with a separator (supports up to 64
|
|
* bytes of the input)
|
|
* %n is ignored
|
|
*
|
|
* ** Please update Documentation/printk-formats.txt when making changes **
|
|
*
|
|
* The return value is the number of characters which would
|
|
* be generated for the given input, excluding the trailing
|
|
* '\0', as per ISO C99. If you want to have the exact
|
|
* number of characters written into @buf as return value
|
|
* (not including the trailing '\0'), use vscnprintf(). If the
|
|
* return is greater than or equal to @size, the resulting
|
|
* string is truncated.
|
|
*
|
|
* If you're not already dealing with a va_list consider using snprintf().
|
|
*/
|
|
int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
|
{
|
|
unsigned long long num;
|
|
char *str, *end;
|
|
struct printf_spec spec = {0};
|
|
|
|
/* Reject out-of-range values early. Large positive sizes are
|
|
used for unknown buffer sizes. */
|
|
if (WARN_ON_ONCE((int) size < 0))
|
|
return 0;
|
|
|
|
str = buf;
|
|
end = buf + size;
|
|
|
|
/* Make sure end is always >= buf */
|
|
if (end < buf) {
|
|
end = ((void *)-1);
|
|
size = end - buf;
|
|
}
|
|
|
|
while (*fmt) {
|
|
const char *old_fmt = fmt;
|
|
int read = format_decode(fmt, &spec);
|
|
|
|
fmt += read;
|
|
|
|
switch (spec.type) {
|
|
case FORMAT_TYPE_NONE: {
|
|
int copy = read;
|
|
if (str < end) {
|
|
if (copy > end - str)
|
|
copy = end - str;
|
|
memcpy(str, old_fmt, copy);
|
|
}
|
|
str += read;
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_WIDTH:
|
|
spec.field_width = va_arg(args, int);
|
|
break;
|
|
|
|
case FORMAT_TYPE_PRECISION:
|
|
spec.precision = va_arg(args, int);
|
|
break;
|
|
|
|
case FORMAT_TYPE_CHAR: {
|
|
char c;
|
|
|
|
if (!(spec.flags & LEFT)) {
|
|
while (--spec.field_width > 0) {
|
|
if (str < end)
|
|
*str = ' ';
|
|
++str;
|
|
|
|
}
|
|
}
|
|
c = (unsigned char) va_arg(args, int);
|
|
if (str < end)
|
|
*str = c;
|
|
++str;
|
|
while (--spec.field_width > 0) {
|
|
if (str < end)
|
|
*str = ' ';
|
|
++str;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_STR:
|
|
str = string(str, end, va_arg(args, char *), spec);
|
|
break;
|
|
|
|
case FORMAT_TYPE_PTR:
|
|
str = pointer(fmt+1, str, end, va_arg(args, void *),
|
|
spec);
|
|
while (isalnum(*fmt))
|
|
fmt++;
|
|
break;
|
|
|
|
case FORMAT_TYPE_PERCENT_CHAR:
|
|
if (str < end)
|
|
*str = '%';
|
|
++str;
|
|
break;
|
|
|
|
case FORMAT_TYPE_INVALID:
|
|
if (str < end)
|
|
*str = '%';
|
|
++str;
|
|
break;
|
|
|
|
case FORMAT_TYPE_NRCHARS: {
|
|
u8 qualifier = spec.qualifier;
|
|
|
|
if (qualifier == 'l') {
|
|
long *ip = va_arg(args, long *);
|
|
*ip = (str - buf);
|
|
} else if (_tolower(qualifier) == 'z') {
|
|
size_t *ip = va_arg(args, size_t *);
|
|
*ip = (str - buf);
|
|
} else {
|
|
int *ip = va_arg(args, int *);
|
|
*ip = (str - buf);
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
switch (spec.type) {
|
|
case FORMAT_TYPE_LONG_LONG:
|
|
num = va_arg(args, long long);
|
|
break;
|
|
case FORMAT_TYPE_ULONG:
|
|
num = va_arg(args, unsigned long);
|
|
break;
|
|
case FORMAT_TYPE_LONG:
|
|
num = va_arg(args, long);
|
|
break;
|
|
case FORMAT_TYPE_SIZE_T:
|
|
if (spec.flags & SIGN)
|
|
num = va_arg(args, ssize_t);
|
|
else
|
|
num = va_arg(args, size_t);
|
|
break;
|
|
case FORMAT_TYPE_PTRDIFF:
|
|
num = va_arg(args, ptrdiff_t);
|
|
break;
|
|
case FORMAT_TYPE_UBYTE:
|
|
num = (unsigned char) va_arg(args, int);
|
|
break;
|
|
case FORMAT_TYPE_BYTE:
|
|
num = (signed char) va_arg(args, int);
|
|
break;
|
|
case FORMAT_TYPE_USHORT:
|
|
num = (unsigned short) va_arg(args, int);
|
|
break;
|
|
case FORMAT_TYPE_SHORT:
|
|
num = (short) va_arg(args, int);
|
|
break;
|
|
case FORMAT_TYPE_INT:
|
|
num = (int) va_arg(args, int);
|
|
break;
|
|
default:
|
|
num = va_arg(args, unsigned int);
|
|
}
|
|
|
|
str = number(str, end, num, spec);
|
|
}
|
|
}
|
|
|
|
if (size > 0) {
|
|
if (str < end)
|
|
*str = '\0';
|
|
else
|
|
end[-1] = '\0';
|
|
}
|
|
|
|
/* the trailing null byte doesn't count towards the total */
|
|
return str-buf;
|
|
|
|
}
|
|
EXPORT_SYMBOL(vsnprintf);
|
|
|
|
/**
|
|
* vscnprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @size: The size of the buffer, including the trailing null space
|
|
* @fmt: The format string to use
|
|
* @args: Arguments for the format string
|
|
*
|
|
* The return value is the number of characters which have been written into
|
|
* the @buf not including the trailing '\0'. If @size is == 0 the function
|
|
* returns 0.
|
|
*
|
|
* If you're not already dealing with a va_list consider using scnprintf().
|
|
*
|
|
* See the vsnprintf() documentation for format string extensions over C99.
|
|
*/
|
|
int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
|
{
|
|
int i;
|
|
|
|
i = vsnprintf(buf, size, fmt, args);
|
|
|
|
if (likely(i < size))
|
|
return i;
|
|
if (size != 0)
|
|
return size - 1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(vscnprintf);
|
|
|
|
/**
|
|
* snprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @size: The size of the buffer, including the trailing null space
|
|
* @fmt: The format string to use
|
|
* @...: Arguments for the format string
|
|
*
|
|
* The return value is the number of characters which would be
|
|
* generated for the given input, excluding the trailing null,
|
|
* as per ISO C99. If the return is greater than or equal to
|
|
* @size, the resulting string is truncated.
|
|
*
|
|
* See the vsnprintf() documentation for format string extensions over C99.
|
|
*/
|
|
int snprintf(char *buf, size_t size, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = vsnprintf(buf, size, fmt, args);
|
|
va_end(args);
|
|
|
|
return i;
|
|
}
|
|
EXPORT_SYMBOL(snprintf);
|
|
|
|
/**
|
|
* scnprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @size: The size of the buffer, including the trailing null space
|
|
* @fmt: The format string to use
|
|
* @...: Arguments for the format string
|
|
*
|
|
* The return value is the number of characters written into @buf not including
|
|
* the trailing '\0'. If @size is == 0 the function returns 0.
|
|
*/
|
|
|
|
int scnprintf(char *buf, size_t size, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = vscnprintf(buf, size, fmt, args);
|
|
va_end(args);
|
|
|
|
return i;
|
|
}
|
|
EXPORT_SYMBOL(scnprintf);
|
|
|
|
/**
|
|
* vsprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @fmt: The format string to use
|
|
* @args: Arguments for the format string
|
|
*
|
|
* The function returns the number of characters written
|
|
* into @buf. Use vsnprintf() or vscnprintf() in order to avoid
|
|
* buffer overflows.
|
|
*
|
|
* If you're not already dealing with a va_list consider using sprintf().
|
|
*
|
|
* See the vsnprintf() documentation for format string extensions over C99.
|
|
*/
|
|
int vsprintf(char *buf, const char *fmt, va_list args)
|
|
{
|
|
return vsnprintf(buf, INT_MAX, fmt, args);
|
|
}
|
|
EXPORT_SYMBOL(vsprintf);
|
|
|
|
/**
|
|
* sprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @fmt: The format string to use
|
|
* @...: Arguments for the format string
|
|
*
|
|
* The function returns the number of characters written
|
|
* into @buf. Use snprintf() or scnprintf() in order to avoid
|
|
* buffer overflows.
|
|
*
|
|
* See the vsnprintf() documentation for format string extensions over C99.
|
|
*/
|
|
int sprintf(char *buf, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = vsnprintf(buf, INT_MAX, fmt, args);
|
|
va_end(args);
|
|
|
|
return i;
|
|
}
|
|
EXPORT_SYMBOL(sprintf);
|
|
|
|
#ifdef CONFIG_BINARY_PRINTF
|
|
/*
|
|
* bprintf service:
|
|
* vbin_printf() - VA arguments to binary data
|
|
* bstr_printf() - Binary data to text string
|
|
*/
|
|
|
|
/**
|
|
* vbin_printf - Parse a format string and place args' binary value in a buffer
|
|
* @bin_buf: The buffer to place args' binary value
|
|
* @size: The size of the buffer(by words(32bits), not characters)
|
|
* @fmt: The format string to use
|
|
* @args: Arguments for the format string
|
|
*
|
|
* The format follows C99 vsnprintf, except %n is ignored, and its argument
|
|
* is skiped.
|
|
*
|
|
* The return value is the number of words(32bits) which would be generated for
|
|
* the given input.
|
|
*
|
|
* NOTE:
|
|
* If the return value is greater than @size, the resulting bin_buf is NOT
|
|
* valid for bstr_printf().
|
|
*/
|
|
int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
|
|
{
|
|
struct printf_spec spec = {0};
|
|
char *str, *end;
|
|
|
|
str = (char *)bin_buf;
|
|
end = (char *)(bin_buf + size);
|
|
|
|
#define save_arg(type) \
|
|
do { \
|
|
if (sizeof(type) == 8) { \
|
|
unsigned long long value; \
|
|
str = PTR_ALIGN(str, sizeof(u32)); \
|
|
value = va_arg(args, unsigned long long); \
|
|
if (str + sizeof(type) <= end) { \
|
|
*(u32 *)str = *(u32 *)&value; \
|
|
*(u32 *)(str + 4) = *((u32 *)&value + 1); \
|
|
} \
|
|
} else { \
|
|
unsigned long value; \
|
|
str = PTR_ALIGN(str, sizeof(type)); \
|
|
value = va_arg(args, int); \
|
|
if (str + sizeof(type) <= end) \
|
|
*(typeof(type) *)str = (type)value; \
|
|
} \
|
|
str += sizeof(type); \
|
|
} while (0)
|
|
|
|
while (*fmt) {
|
|
int read = format_decode(fmt, &spec);
|
|
|
|
fmt += read;
|
|
|
|
switch (spec.type) {
|
|
case FORMAT_TYPE_NONE:
|
|
case FORMAT_TYPE_INVALID:
|
|
case FORMAT_TYPE_PERCENT_CHAR:
|
|
break;
|
|
|
|
case FORMAT_TYPE_WIDTH:
|
|
case FORMAT_TYPE_PRECISION:
|
|
save_arg(int);
|
|
break;
|
|
|
|
case FORMAT_TYPE_CHAR:
|
|
save_arg(char);
|
|
break;
|
|
|
|
case FORMAT_TYPE_STR: {
|
|
const char *save_str = va_arg(args, char *);
|
|
size_t len;
|
|
|
|
if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
|
|
|| (unsigned long)save_str < PAGE_SIZE)
|
|
save_str = "(null)";
|
|
len = strlen(save_str) + 1;
|
|
if (str + len < end)
|
|
memcpy(str, save_str, len);
|
|
str += len;
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_PTR:
|
|
save_arg(void *);
|
|
/* skip all alphanumeric pointer suffixes */
|
|
while (isalnum(*fmt))
|
|
fmt++;
|
|
break;
|
|
|
|
case FORMAT_TYPE_NRCHARS: {
|
|
/* skip %n 's argument */
|
|
u8 qualifier = spec.qualifier;
|
|
void *skip_arg;
|
|
if (qualifier == 'l')
|
|
skip_arg = va_arg(args, long *);
|
|
else if (_tolower(qualifier) == 'z')
|
|
skip_arg = va_arg(args, size_t *);
|
|
else
|
|
skip_arg = va_arg(args, int *);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
switch (spec.type) {
|
|
|
|
case FORMAT_TYPE_LONG_LONG:
|
|
save_arg(long long);
|
|
break;
|
|
case FORMAT_TYPE_ULONG:
|
|
case FORMAT_TYPE_LONG:
|
|
save_arg(unsigned long);
|
|
break;
|
|
case FORMAT_TYPE_SIZE_T:
|
|
save_arg(size_t);
|
|
break;
|
|
case FORMAT_TYPE_PTRDIFF:
|
|
save_arg(ptrdiff_t);
|
|
break;
|
|
case FORMAT_TYPE_UBYTE:
|
|
case FORMAT_TYPE_BYTE:
|
|
save_arg(char);
|
|
break;
|
|
case FORMAT_TYPE_USHORT:
|
|
case FORMAT_TYPE_SHORT:
|
|
save_arg(short);
|
|
break;
|
|
default:
|
|
save_arg(int);
|
|
}
|
|
}
|
|
}
|
|
|
|
return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
|
|
#undef save_arg
|
|
}
|
|
EXPORT_SYMBOL_GPL(vbin_printf);
|
|
|
|
/**
|
|
* bstr_printf - Format a string from binary arguments and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @size: The size of the buffer, including the trailing null space
|
|
* @fmt: The format string to use
|
|
* @bin_buf: Binary arguments for the format string
|
|
*
|
|
* This function like C99 vsnprintf, but the difference is that vsnprintf gets
|
|
* arguments from stack, and bstr_printf gets arguments from @bin_buf which is
|
|
* a binary buffer that generated by vbin_printf.
|
|
*
|
|
* The format follows C99 vsnprintf, but has some extensions:
|
|
* see vsnprintf comment for details.
|
|
*
|
|
* The return value is the number of characters which would
|
|
* be generated for the given input, excluding the trailing
|
|
* '\0', as per ISO C99. If you want to have the exact
|
|
* number of characters written into @buf as return value
|
|
* (not including the trailing '\0'), use vscnprintf(). If the
|
|
* return is greater than or equal to @size, the resulting
|
|
* string is truncated.
|
|
*/
|
|
int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
|
|
{
|
|
struct printf_spec spec = {0};
|
|
char *str, *end;
|
|
const char *args = (const char *)bin_buf;
|
|
|
|
if (WARN_ON_ONCE((int) size < 0))
|
|
return 0;
|
|
|
|
str = buf;
|
|
end = buf + size;
|
|
|
|
#define get_arg(type) \
|
|
({ \
|
|
typeof(type) value; \
|
|
if (sizeof(type) == 8) { \
|
|
args = PTR_ALIGN(args, sizeof(u32)); \
|
|
*(u32 *)&value = *(u32 *)args; \
|
|
*((u32 *)&value + 1) = *(u32 *)(args + 4); \
|
|
} else { \
|
|
args = PTR_ALIGN(args, sizeof(type)); \
|
|
value = *(typeof(type) *)args; \
|
|
} \
|
|
args += sizeof(type); \
|
|
value; \
|
|
})
|
|
|
|
/* Make sure end is always >= buf */
|
|
if (end < buf) {
|
|
end = ((void *)-1);
|
|
size = end - buf;
|
|
}
|
|
|
|
while (*fmt) {
|
|
const char *old_fmt = fmt;
|
|
int read = format_decode(fmt, &spec);
|
|
|
|
fmt += read;
|
|
|
|
switch (spec.type) {
|
|
case FORMAT_TYPE_NONE: {
|
|
int copy = read;
|
|
if (str < end) {
|
|
if (copy > end - str)
|
|
copy = end - str;
|
|
memcpy(str, old_fmt, copy);
|
|
}
|
|
str += read;
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_WIDTH:
|
|
spec.field_width = get_arg(int);
|
|
break;
|
|
|
|
case FORMAT_TYPE_PRECISION:
|
|
spec.precision = get_arg(int);
|
|
break;
|
|
|
|
case FORMAT_TYPE_CHAR: {
|
|
char c;
|
|
|
|
if (!(spec.flags & LEFT)) {
|
|
while (--spec.field_width > 0) {
|
|
if (str < end)
|
|
*str = ' ';
|
|
++str;
|
|
}
|
|
}
|
|
c = (unsigned char) get_arg(char);
|
|
if (str < end)
|
|
*str = c;
|
|
++str;
|
|
while (--spec.field_width > 0) {
|
|
if (str < end)
|
|
*str = ' ';
|
|
++str;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_STR: {
|
|
const char *str_arg = args;
|
|
args += strlen(str_arg) + 1;
|
|
str = string(str, end, (char *)str_arg, spec);
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_PTR:
|
|
str = pointer(fmt+1, str, end, get_arg(void *), spec);
|
|
while (isalnum(*fmt))
|
|
fmt++;
|
|
break;
|
|
|
|
case FORMAT_TYPE_PERCENT_CHAR:
|
|
case FORMAT_TYPE_INVALID:
|
|
if (str < end)
|
|
*str = '%';
|
|
++str;
|
|
break;
|
|
|
|
case FORMAT_TYPE_NRCHARS:
|
|
/* skip */
|
|
break;
|
|
|
|
default: {
|
|
unsigned long long num;
|
|
|
|
switch (spec.type) {
|
|
|
|
case FORMAT_TYPE_LONG_LONG:
|
|
num = get_arg(long long);
|
|
break;
|
|
case FORMAT_TYPE_ULONG:
|
|
case FORMAT_TYPE_LONG:
|
|
num = get_arg(unsigned long);
|
|
break;
|
|
case FORMAT_TYPE_SIZE_T:
|
|
num = get_arg(size_t);
|
|
break;
|
|
case FORMAT_TYPE_PTRDIFF:
|
|
num = get_arg(ptrdiff_t);
|
|
break;
|
|
case FORMAT_TYPE_UBYTE:
|
|
num = get_arg(unsigned char);
|
|
break;
|
|
case FORMAT_TYPE_BYTE:
|
|
num = get_arg(signed char);
|
|
break;
|
|
case FORMAT_TYPE_USHORT:
|
|
num = get_arg(unsigned short);
|
|
break;
|
|
case FORMAT_TYPE_SHORT:
|
|
num = get_arg(short);
|
|
break;
|
|
case FORMAT_TYPE_UINT:
|
|
num = get_arg(unsigned int);
|
|
break;
|
|
default:
|
|
num = get_arg(int);
|
|
}
|
|
|
|
str = number(str, end, num, spec);
|
|
} /* default: */
|
|
} /* switch(spec.type) */
|
|
} /* while(*fmt) */
|
|
|
|
if (size > 0) {
|
|
if (str < end)
|
|
*str = '\0';
|
|
else
|
|
end[-1] = '\0';
|
|
}
|
|
|
|
#undef get_arg
|
|
|
|
/* the trailing null byte doesn't count towards the total */
|
|
return str - buf;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bstr_printf);
|
|
|
|
/**
|
|
* bprintf - Parse a format string and place args' binary value in a buffer
|
|
* @bin_buf: The buffer to place args' binary value
|
|
* @size: The size of the buffer(by words(32bits), not characters)
|
|
* @fmt: The format string to use
|
|
* @...: Arguments for the format string
|
|
*
|
|
* The function returns the number of words(u32) written
|
|
* into @bin_buf.
|
|
*/
|
|
int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int ret;
|
|
|
|
va_start(args, fmt);
|
|
ret = vbin_printf(bin_buf, size, fmt, args);
|
|
va_end(args);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bprintf);
|
|
|
|
#endif /* CONFIG_BINARY_PRINTF */
|
|
|
|
/**
|
|
* vsscanf - Unformat a buffer into a list of arguments
|
|
* @buf: input buffer
|
|
* @fmt: format of buffer
|
|
* @args: arguments
|
|
*/
|
|
int vsscanf(const char *buf, const char *fmt, va_list args)
|
|
{
|
|
const char *str = buf;
|
|
char *next;
|
|
char digit;
|
|
int num = 0;
|
|
u8 qualifier;
|
|
unsigned int base;
|
|
union {
|
|
long long s;
|
|
unsigned long long u;
|
|
} val;
|
|
s16 field_width;
|
|
bool is_sign;
|
|
|
|
while (*fmt) {
|
|
/* skip any white space in format */
|
|
/* white space in format matchs any amount of
|
|
* white space, including none, in the input.
|
|
*/
|
|
if (isspace(*fmt)) {
|
|
fmt = skip_spaces(++fmt);
|
|
str = skip_spaces(str);
|
|
}
|
|
|
|
/* anything that is not a conversion must match exactly */
|
|
if (*fmt != '%' && *fmt) {
|
|
if (*fmt++ != *str++)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
if (!*fmt)
|
|
break;
|
|
++fmt;
|
|
|
|
/* skip this conversion.
|
|
* advance both strings to next white space
|
|
*/
|
|
if (*fmt == '*') {
|
|
if (!*str)
|
|
break;
|
|
while (!isspace(*fmt) && *fmt != '%' && *fmt)
|
|
fmt++;
|
|
while (!isspace(*str) && *str)
|
|
str++;
|
|
continue;
|
|
}
|
|
|
|
/* get field width */
|
|
field_width = -1;
|
|
if (isdigit(*fmt)) {
|
|
field_width = skip_atoi(&fmt);
|
|
if (field_width <= 0)
|
|
break;
|
|
}
|
|
|
|
/* get conversion qualifier */
|
|
qualifier = -1;
|
|
if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
|
|
_tolower(*fmt) == 'z') {
|
|
qualifier = *fmt++;
|
|
if (unlikely(qualifier == *fmt)) {
|
|
if (qualifier == 'h') {
|
|
qualifier = 'H';
|
|
fmt++;
|
|
} else if (qualifier == 'l') {
|
|
qualifier = 'L';
|
|
fmt++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!*fmt)
|
|
break;
|
|
|
|
if (*fmt == 'n') {
|
|
/* return number of characters read so far */
|
|
*va_arg(args, int *) = str - buf;
|
|
++fmt;
|
|
continue;
|
|
}
|
|
|
|
if (!*str)
|
|
break;
|
|
|
|
base = 10;
|
|
is_sign = 0;
|
|
|
|
switch (*fmt++) {
|
|
case 'c':
|
|
{
|
|
char *s = (char *)va_arg(args, char*);
|
|
if (field_width == -1)
|
|
field_width = 1;
|
|
do {
|
|
*s++ = *str++;
|
|
} while (--field_width > 0 && *str);
|
|
num++;
|
|
}
|
|
continue;
|
|
case 's':
|
|
{
|
|
char *s = (char *)va_arg(args, char *);
|
|
if (field_width == -1)
|
|
field_width = SHRT_MAX;
|
|
/* first, skip leading white space in buffer */
|
|
str = skip_spaces(str);
|
|
|
|
/* now copy until next white space */
|
|
while (*str && !isspace(*str) && field_width--)
|
|
*s++ = *str++;
|
|
*s = '\0';
|
|
num++;
|
|
}
|
|
continue;
|
|
case 'o':
|
|
base = 8;
|
|
break;
|
|
case 'x':
|
|
case 'X':
|
|
base = 16;
|
|
break;
|
|
case 'i':
|
|
base = 0;
|
|
case 'd':
|
|
is_sign = 1;
|
|
case 'u':
|
|
break;
|
|
case '%':
|
|
/* looking for '%' in str */
|
|
if (*str++ != '%')
|
|
return num;
|
|
continue;
|
|
default:
|
|
/* invalid format; stop here */
|
|
return num;
|
|
}
|
|
|
|
/* have some sort of integer conversion.
|
|
* first, skip white space in buffer.
|
|
*/
|
|
str = skip_spaces(str);
|
|
|
|
digit = *str;
|
|
if (is_sign && digit == '-')
|
|
digit = *(str + 1);
|
|
|
|
if (!digit
|
|
|| (base == 16 && !isxdigit(digit))
|
|
|| (base == 10 && !isdigit(digit))
|
|
|| (base == 8 && (!isdigit(digit) || digit > '7'))
|
|
|| (base == 0 && !isdigit(digit)))
|
|
break;
|
|
|
|
if (is_sign)
|
|
val.s = qualifier != 'L' ?
|
|
simple_strtol(str, &next, base) :
|
|
simple_strtoll(str, &next, base);
|
|
else
|
|
val.u = qualifier != 'L' ?
|
|
simple_strtoul(str, &next, base) :
|
|
simple_strtoull(str, &next, base);
|
|
|
|
if (field_width > 0 && next - str > field_width) {
|
|
if (base == 0)
|
|
_parse_integer_fixup_radix(str, &base);
|
|
while (next - str > field_width) {
|
|
if (is_sign)
|
|
val.s = div_s64(val.s, base);
|
|
else
|
|
val.u = div_u64(val.u, base);
|
|
--next;
|
|
}
|
|
}
|
|
|
|
switch (qualifier) {
|
|
case 'H': /* that's 'hh' in format */
|
|
if (is_sign)
|
|
*va_arg(args, signed char *) = val.s;
|
|
else
|
|
*va_arg(args, unsigned char *) = val.u;
|
|
break;
|
|
case 'h':
|
|
if (is_sign)
|
|
*va_arg(args, short *) = val.s;
|
|
else
|
|
*va_arg(args, unsigned short *) = val.u;
|
|
break;
|
|
case 'l':
|
|
if (is_sign)
|
|
*va_arg(args, long *) = val.s;
|
|
else
|
|
*va_arg(args, unsigned long *) = val.u;
|
|
break;
|
|
case 'L':
|
|
if (is_sign)
|
|
*va_arg(args, long long *) = val.s;
|
|
else
|
|
*va_arg(args, unsigned long long *) = val.u;
|
|
break;
|
|
case 'Z':
|
|
case 'z':
|
|
*va_arg(args, size_t *) = val.u;
|
|
break;
|
|
default:
|
|
if (is_sign)
|
|
*va_arg(args, int *) = val.s;
|
|
else
|
|
*va_arg(args, unsigned int *) = val.u;
|
|
break;
|
|
}
|
|
num++;
|
|
|
|
if (!next)
|
|
break;
|
|
str = next;
|
|
}
|
|
|
|
return num;
|
|
}
|
|
EXPORT_SYMBOL(vsscanf);
|
|
|
|
/**
|
|
* sscanf - Unformat a buffer into a list of arguments
|
|
* @buf: input buffer
|
|
* @fmt: formatting of buffer
|
|
* @...: resulting arguments
|
|
*/
|
|
int sscanf(const char *buf, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = vsscanf(buf, fmt, args);
|
|
va_end(args);
|
|
|
|
return i;
|
|
}
|
|
EXPORT_SYMBOL(sscanf);
|