79c2f03aee
At least ARM allows us to dump the stack, but we currently have no prototype for this. Add a dump_stack prototype and provide a static inline function for architectures without stack dump support. Also, call dump_stack() in panic() to provide more information in the case of a panic. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
640 lines
14 KiB
C
640 lines
14 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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#include <stdarg.h>
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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 <asm-generic/div64.h>
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#include <malloc.h>
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#include <kallsyms.h>
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#include <common.h>
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#include <led.h>
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unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
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{
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unsigned long result = 0,value;
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if (*cp == '0') {
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cp++;
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if ((*cp == 'x') && isxdigit(cp[1])) {
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base = 16;
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cp++;
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}
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if (!base) {
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base = 8;
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}
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}
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if (!base) {
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base = 10;
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}
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while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
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? toupper(*cp) : *cp)-'A'+10) < base) {
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result = result*base + value;
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cp++;
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}
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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_strtoul);
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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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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 = 0, value;
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if (*cp == '0') {
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cp++;
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if ((*cp == 'x') && isxdigit (cp[1])) {
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base = 16;
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cp++;
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}
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if (!base) {
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base = 8;
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}
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}
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if (!base) {
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base = 10;
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}
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while (isxdigit (*cp) && (value = isdigit (*cp)
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? *cp - '0'
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: (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) {
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result = result * base + value;
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cp++;
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}
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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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/* we use this so that we can do without the ctype library */
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#define is_digit(c) ((c) >= '0' && (c) <= '9')
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static int skip_atoi(const char **s)
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{
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int i=0;
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while (is_digit(**s))
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i = i*10 + *((*s)++) - '0';
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return i;
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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 /* Must be 32 == 0x20 */
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#define SPECIAL 64 /* 0x */
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static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type)
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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 = ((type & SPECIAL) && base != 10);
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int i;
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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 = (type & SMALL);
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if (type & LEFT)
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type &= ~ZEROPAD;
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sign = 0;
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if (type & 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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size--;
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} else if (type & PLUS) {
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sign = '+';
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size--;
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} else if (type & SPACE) {
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sign = ' ';
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size--;
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}
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}
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if (need_pfx) {
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size--;
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if (base == 16)
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size--;
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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 == 0)
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tmp[i++] = '0';
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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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/* printing 100 using %2d gives "100", not "00" */
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if (i > precision)
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precision = i;
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size -= precision;
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if (!(type & (ZEROPAD+LEFT))) {
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while(--size >= 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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}
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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 (buf < end)
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*buf = '0';
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++buf;
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if (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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}
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/* zero or space padding */
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if (!(type & LEFT)) {
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char c = (type & ZEROPAD) ? '0' : ' ';
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while (--size >= 0) {
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if (buf < end)
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*buf = c;
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++buf;
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}
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}
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/* hmm even more zero padding? */
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while (i <= --precision) {
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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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/* actual digits of result */
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while (--i >= 0) {
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if (buf < end)
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*buf = tmp[i];
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++buf;
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}
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/* trailing space padding */
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while (--size >= 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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return buf;
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}
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#ifndef PAGE_SIZE
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#define PAGE_SIZE 4096
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#endif
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static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags)
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{
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int len, i;
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if ((unsigned long)s < PAGE_SIZE)
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s = "<NULL>";
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len = strnlen(s, precision);
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if (!(flags & LEFT)) {
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while (len < field_width--) {
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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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}
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for (i = 0; i < len; ++i) {
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if (buf < end)
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*buf = *s;
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++buf; ++s;
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}
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while (len < field_width--) {
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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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return buf;
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}
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static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags)
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{
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unsigned long value = (unsigned long) ptr;
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#ifdef CONFIG_KALLSYMS
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char sym[KSYM_SYMBOL_LEN];
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sprint_symbol(sym, value);
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return string(buf, end, sym, field_width, precision, flags);
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#else
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field_width = 2*sizeof(void *);
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flags |= SPECIAL | SMALL | ZEROPAD;
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return number(buf, end, value, 16, field_width, precision, flags);
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#endif
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}
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/*
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* Show a '%p' thing. A kernel extension is that the '%p' is followed
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* by an extra set of alphanumeric characters that are extended format
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* specifiers.
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*
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* Right now we handle:
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*
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* - 'S' For symbolic direct pointers
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*
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* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
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* function pointers are really function descriptors, which contain a
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* pointer to the real address.
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*/
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static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags)
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{
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switch (*fmt) {
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case 'S':
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return symbol_string(buf, end, ptr, field_width, precision, flags);
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}
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flags |= SMALL;
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if (field_width == -1) {
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field_width = 2*sizeof(void *);
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flags |= ZEROPAD;
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}
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return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags);
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}
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/**
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* vsnprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @args: Arguments for the format string
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*
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* This function follows C99 vsnprintf, but has some extensions:
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* %pS output the name of a text symbol
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* %pF output the name of a function pointer
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* %pR output the address range in a struct resource
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*
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* The return value is the number of characters which would
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* be generated for the given input, excluding the trailing
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* '\0', as per ISO C99. If you want to have the exact
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* number of characters written into @buf as return value
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* (not including the trailing '\0'), use vscnprintf(). If the
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* return is greater than or equal to @size, the resulting
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* string is truncated.
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*
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* Call this function if you are already dealing with a va_list.
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* You probably want snprintf() instead.
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*/
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int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
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{
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unsigned long long num;
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int base;
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char *str, *end, c;
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int flags; /* flags to number() */
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int field_width; /* width of output field */
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int precision; /* min. # of digits for integers; max
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number of chars for from string */
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int qualifier; /* 'h', 'l', or 'L' for integer fields */
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/* 'z' support added 23/7/1999 S.H. */
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/* 'z' changed to 'Z' --davidm 1/25/99 */
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/* 't' added for ptrdiff_t */
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/* Reject out-of-range values early. Large positive sizes are
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used for unknown buffer sizes. */
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if (unlikely((int) size < 0))
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return 0;
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str = buf;
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end = buf + size;
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/* Make sure end is always >= buf */
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if (end < buf) {
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end = ((void *)-1);
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size = end - buf;
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}
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for (; *fmt ; ++fmt) {
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if (*fmt != '%') {
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if (str < end)
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*str = *fmt;
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++str;
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continue;
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}
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/* process flags */
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flags = 0;
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repeat:
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++fmt; /* this also skips first '%' */
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switch (*fmt) {
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case '-': flags |= LEFT; goto repeat;
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case '+': flags |= PLUS; goto repeat;
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case ' ': flags |= SPACE; goto repeat;
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case '#': flags |= SPECIAL; goto repeat;
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case '0': flags |= ZEROPAD; goto repeat;
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}
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/* get field width */
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field_width = -1;
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if (isdigit(*fmt))
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field_width = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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field_width = va_arg(args, int);
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if (field_width < 0) {
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field_width = -field_width;
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flags |= LEFT;
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}
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}
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/* get the precision */
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precision = -1;
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if (*fmt == '.') {
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++fmt;
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if (isdigit(*fmt))
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precision = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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precision = va_arg(args, int);
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}
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if (precision < 0)
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precision = 0;
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}
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/* get the conversion qualifier */
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qualifier = -1;
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if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
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*fmt =='Z' || *fmt == 'z' || *fmt == 't') {
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qualifier = *fmt;
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++fmt;
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if (qualifier == 'l' && *fmt == 'l') {
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qualifier = 'L';
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++fmt;
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}
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}
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/* default base */
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base = 10;
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switch (*fmt) {
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case 'c':
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if (!(flags & LEFT)) {
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while (--field_width > 0) {
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if (str < end)
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*str = ' ';
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++str;
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}
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}
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c = (unsigned char) va_arg(args, int);
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if (str < end)
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*str = c;
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++str;
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while (--field_width > 0) {
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if (str < end)
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*str = ' ';
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++str;
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}
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continue;
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case 's':
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str = string(str, end, va_arg(args, char *), field_width, precision, flags);
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continue;
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case 'p':
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str = pointer(fmt+1, str, end,
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va_arg(args, void *),
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field_width, precision, flags);
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/* Skip all alphanumeric pointer suffixes */
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while (isalnum(fmt[1]))
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fmt++;
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continue;
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case 'n':
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/* FIXME:
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* What does C99 say about the overflow case here? */
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if (qualifier == 'l') {
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long * ip = va_arg(args, long *);
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*ip = (str - buf);
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} else if (qualifier == 'Z' || qualifier == 'z') {
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size_t * ip = va_arg(args, size_t *);
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*ip = (str - buf);
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} else {
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int * ip = va_arg(args, int *);
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*ip = (str - buf);
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}
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continue;
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case '%':
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if (str < end)
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*str = '%';
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++str;
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continue;
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/* integer number formats - set up the flags and "break" */
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case 'o':
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base = 8;
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break;
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case 'x':
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flags |= SMALL;
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case 'X':
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base = 16;
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break;
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case 'd':
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case 'i':
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flags |= SIGN;
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case 'u':
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break;
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default:
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if (str < end)
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*str = '%';
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++str;
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if (*fmt) {
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if (str < end)
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*str = *fmt;
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++str;
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} else {
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--fmt;
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}
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continue;
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}
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if (qualifier == 'L')
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num = va_arg(args, long long);
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else if (qualifier == 'l') {
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num = va_arg(args, unsigned long);
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if (flags & SIGN)
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num = (signed long) num;
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} else if (qualifier == 'Z' || qualifier == 'z') {
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num = va_arg(args, size_t);
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} else if (qualifier == 't') {
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num = va_arg(args, ptrdiff_t);
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} else if (qualifier == 'h') {
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num = (unsigned short) va_arg(args, int);
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if (flags & SIGN)
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num = (signed short) num;
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} else {
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num = va_arg(args, unsigned int);
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if (flags & SIGN)
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num = (signed int) num;
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}
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str = number(str, end, num, base,
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field_width, precision, flags);
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}
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if (size > 0) {
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if (str < end)
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*str = '\0';
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else
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end[-1] = '\0';
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}
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/* the trailing null byte doesn't count towards the total */
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return str-buf;
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}
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EXPORT_SYMBOL(vsnprintf);
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/**
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* vscnprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @args: Arguments for the format string
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*
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* The return value is the number of characters which have been written into
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* the @buf not including the trailing '\0'. If @size is <= 0 the function
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* returns 0.
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*
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* Call this function if you are already dealing with a va_list.
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* You probably want scnprintf() instead.
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*
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* See the vsnprintf() documentation for format string extensions over C99.
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*/
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int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
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{
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int i;
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i=vsnprintf(buf,size,fmt,args);
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return (i >= size) ? (size - 1) : i;
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}
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EXPORT_SYMBOL(vscnprintf);
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|
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/**
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* vsprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @fmt: The format string to use
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* @args: Arguments for the format string
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*
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* The function returns the number of characters written
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* into @buf. Use vsnprintf() or vscnprintf() in order to avoid
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* buffer overflows.
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*
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* Call this function if you are already dealing with a va_list.
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* You probably want sprintf() instead.
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*
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* See the vsnprintf() documentation for format string extensions over C99.
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*/
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int vsprintf(char *buf, const char *fmt, va_list args)
|
|
{
|
|
return vsnprintf(buf, INT_MAX, fmt, args);
|
|
}
|
|
EXPORT_SYMBOL(vsprintf);
|
|
|
|
int sprintf(char * buf, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i=vsprintf(buf,fmt,args);
|
|
va_end(args);
|
|
return i;
|
|
}
|
|
EXPORT_SYMBOL(sprintf);
|
|
|
|
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);
|
|
|
|
/* Simplified asprintf. */
|
|
char *vasprintf(const char *fmt, va_list ap)
|
|
{
|
|
unsigned int len;
|
|
char *p;
|
|
va_list aq;
|
|
|
|
va_copy(aq, ap);
|
|
len = vsnprintf(NULL, 0, fmt, aq);
|
|
va_end(aq);
|
|
|
|
p = malloc(len + 1);
|
|
if (!p)
|
|
return NULL;
|
|
|
|
vsnprintf(p, len + 1, fmt, ap);
|
|
|
|
return p;
|
|
}
|
|
EXPORT_SYMBOL(vasprintf);
|
|
|
|
char *asprintf(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
char *p;
|
|
|
|
va_start(ap, fmt);
|
|
p = vasprintf(fmt, ap);
|
|
va_end(ap);
|
|
|
|
return p;
|
|
}
|
|
EXPORT_SYMBOL(asprintf);
|
|
|
|
void __noreturn panic(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
vprintf(fmt, args);
|
|
putchar('\n');
|
|
va_end(args);
|
|
|
|
dump_stack();
|
|
|
|
led_trigger(LED_TRIGGER_PANIC, TRIGGER_ENABLE);
|
|
|
|
#if defined (CONFIG_PANIC_HANG)
|
|
hang();
|
|
#else
|
|
udelay(100000); /* allow messages to go out */
|
|
reset_cpu(0);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(panic);
|