1,37 → 1,1353 |
/* |
* vsprintf - print formatted output without ellipsis on an array |
* linux/lib/vsprintf.c |
* |
* Copyright (C) 1991, 1992 Linus Torvalds |
*/ |
/* $Header$ */ |
|
#include "stdio.h" |
/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ |
/* |
* Wirzenius wrote this portably, Torvalds fucked it up :-) |
*/ |
|
/* |
* Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
* - changed to provide snprintf and vsnprintf functions |
* So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> |
* - scnprintf and vscnprintf |
*/ |
|
#include <stdarg.h> |
#include <limits.h> |
#include "loc_incl.h" |
#include <linux/module.h> |
#include <linux/types.h> |
#include <linux/string.h> |
#include <linux/ctype.h> |
#include <linux/kernel.h> |
#include <errno-base.h> |
#include <linux/ioport.h> |
|
#define putc(c, p) (--(p)->_count >= 0 ? \ |
(int) (*(p)->_ptr++ = (c)) : EOF) |
#include <asm/div64.h> |
|
int |
vsnprintf(char *s, unsigned n, const char *format, va_list arg) |
struct va_format { |
const char *fmt; |
va_list *va; |
}; |
|
#ifndef dereference_function_descriptor |
#define dereference_function_descriptor(p) (p) |
#endif |
|
const char hex_asc[] = "0123456789abcdef"; |
|
/* Works only for digits and letters, but small and fast */ |
#define TOLOWER(x) ((x) | 0x20) |
|
static unsigned int simple_guess_base(const char *cp) |
{ |
int retval; |
FILE tmp_stream; |
if (cp[0] == '0') { |
if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) |
return 16; |
else |
return 8; |
} else { |
return 10; |
} |
} |
|
tmp_stream._fd = -1; |
tmp_stream._flags = _IOWRITE + _IONBF + _IOWRITING; |
tmp_stream._buf = (unsigned char *) s; |
tmp_stream._ptr = (unsigned char *) s; |
tmp_stream._count = n-1; |
/** |
* simple_strtoull - convert a string to an unsigned long long |
* @cp: The start of the string |
* @endp: A pointer to the end of the parsed string will be placed here |
* @base: The number base to use |
*/ |
unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
{ |
unsigned long long result = 0; |
|
retval = _doprnt(format, arg, &tmp_stream); |
tmp_stream._count = 1; |
putc('\0',&tmp_stream); |
if (!base) |
base = simple_guess_base(cp); |
|
return retval; |
if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
cp += 2; |
|
while (isxdigit(*cp)) { |
unsigned int value; |
|
value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; |
if (value >= base) |
break; |
result = result * base + value; |
cp++; |
} |
if (endp) |
*endp = (char *)cp; |
|
int |
vsprintf(char *s, const char *format, va_list arg) |
return result; |
} |
EXPORT_SYMBOL(simple_strtoull); |
|
/** |
* simple_strtoul - convert a string to an unsigned long |
* @cp: The start of the string |
* @endp: A pointer to the end of the parsed string will be placed here |
* @base: The number base to use |
*/ |
unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
{ |
return vsnprintf(s, INT_MAX, format, arg); |
return simple_strtoull(cp, endp, base); |
} |
EXPORT_SYMBOL(simple_strtoul); |
|
/** |
* simple_strtol - convert a string to a signed long |
* @cp: The start of the string |
* @endp: A pointer to the end of the parsed string will be placed here |
* @base: The number base to use |
*/ |
long simple_strtol(const char *cp, char **endp, unsigned int base) |
{ |
if (*cp == '-') |
return -simple_strtoul(cp + 1, endp, base); |
|
return simple_strtoul(cp, endp, base); |
} |
EXPORT_SYMBOL(simple_strtol); |
|
/** |
* simple_strtoll - convert a string to a signed long long |
* @cp: The start of the string |
* @endp: A pointer to the end of the parsed string will be placed here |
* @base: The number base to use |
*/ |
long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
{ |
if (*cp == '-') |
return -simple_strtoull(cp + 1, endp, base); |
|
return simple_strtoull(cp, endp, base); |
} |
EXPORT_SYMBOL(simple_strtoll); |
|
/** |
* strict_strtoul - convert a string to an unsigned long strictly |
* @cp: The string to be converted |
* @base: The number base to use |
* @res: The converted result value |
* |
* strict_strtoul converts a string to an unsigned long only if the |
* string is really an unsigned long string, any string containing |
* any invalid char at the tail will be rejected and -EINVAL is returned, |
* only a newline char at the tail is acceptible because people generally |
* change a module parameter in the following way: |
* |
* echo 1024 > /sys/module/e1000/parameters/copybreak |
* |
* echo will append a newline to the tail. |
* |
* It returns 0 if conversion is successful and *res is set to the converted |
* value, otherwise it returns -EINVAL and *res is set to 0. |
* |
* simple_strtoul just ignores the successive invalid characters and |
* return the converted value of prefix part of the string. |
*/ |
int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) |
{ |
char *tail; |
unsigned long val; |
|
*res = 0; |
if (!*cp) |
return -EINVAL; |
|
val = simple_strtoul(cp, &tail, base); |
if (tail == cp) |
return -EINVAL; |
|
if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) { |
*res = val; |
return 0; |
} |
|
return -EINVAL; |
} |
EXPORT_SYMBOL(strict_strtoul); |
|
/** |
* strict_strtol - convert a string to a long strictly |
* @cp: The string to be converted |
* @base: The number base to use |
* @res: The converted result value |
* |
* strict_strtol is similiar to strict_strtoul, but it allows the first |
* character of a string is '-'. |
* |
* It returns 0 if conversion is successful and *res is set to the converted |
* value, otherwise it returns -EINVAL and *res is set to 0. |
*/ |
int strict_strtol(const char *cp, unsigned int base, long *res) |
{ |
int ret; |
if (*cp == '-') { |
ret = strict_strtoul(cp + 1, base, (unsigned long *)res); |
if (!ret) |
*res = -(*res); |
} else { |
ret = strict_strtoul(cp, base, (unsigned long *)res); |
} |
|
return ret; |
} |
EXPORT_SYMBOL(strict_strtol); |
|
/** |
* strict_strtoull - convert a string to an unsigned long long strictly |
* @cp: The string to be converted |
* @base: The number base to use |
* @res: The converted result value |
* |
* strict_strtoull converts a string to an unsigned long long only if the |
* string is really an unsigned long long string, any string containing |
* any invalid char at the tail will be rejected and -EINVAL is returned, |
* only a newline char at the tail is acceptible because people generally |
* change a module parameter in the following way: |
* |
* echo 1024 > /sys/module/e1000/parameters/copybreak |
* |
* echo will append a newline to the tail of the string. |
* |
* It returns 0 if conversion is successful and *res is set to the converted |
* value, otherwise it returns -EINVAL and *res is set to 0. |
* |
* simple_strtoull just ignores the successive invalid characters and |
* return the converted value of prefix part of the string. |
*/ |
int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) |
{ |
char *tail; |
unsigned long long val; |
|
*res = 0; |
if (!*cp) |
return -EINVAL; |
|
val = simple_strtoull(cp, &tail, base); |
if (tail == cp) |
return -EINVAL; |
if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) { |
*res = val; |
return 0; |
} |
|
return -EINVAL; |
} |
EXPORT_SYMBOL(strict_strtoull); |
|
/** |
* strict_strtoll - convert a string to a long long strictly |
* @cp: The string to be converted |
* @base: The number base to use |
* @res: The converted result value |
* |
* strict_strtoll is similiar to strict_strtoull, but it allows the first |
* character of a string is '-'. |
* |
* It returns 0 if conversion is successful and *res is set to the converted |
* value, otherwise it returns -EINVAL and *res is set to 0. |
*/ |
int strict_strtoll(const char *cp, unsigned int base, long long *res) |
{ |
int ret; |
if (*cp == '-') { |
ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); |
if (!ret) |
*res = -(*res); |
} else { |
ret = strict_strtoull(cp, base, (unsigned long long *)res); |
} |
|
return ret; |
} |
EXPORT_SYMBOL(strict_strtoll); |
|
static noinline_for_stack |
int skip_atoi(const char **s) |
{ |
int i = 0; |
|
while (isdigit(**s)) |
i = i*10 + *((*s)++) - '0'; |
|
return i; |
} |
|
/* Decimal conversion is by far the most typical, and is used |
* for /proc and /sys data. This directly impacts e.g. top performance |
* with many processes running. We optimize it for speed |
* using code from |
* http://www.cs.uiowa.edu/~jones/bcd/decimal.html |
* (with permission from the author, Douglas W. Jones). */ |
|
/* Formats correctly any integer in [0,99999]. |
* Outputs from one to five digits depending on input. |
* On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ |
static noinline_for_stack |
char *put_dec_trunc(char *buf, unsigned q) |
{ |
unsigned d3, d2, d1, d0; |
d1 = (q>>4) & 0xf; |
d2 = (q>>8) & 0xf; |
d3 = (q>>12); |
|
d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
q = (d0 * 0xcd) >> 11; |
d0 = d0 - 10*q; |
*buf++ = d0 + '0'; /* least significant digit */ |
d1 = q + 9*d3 + 5*d2 + d1; |
if (d1 != 0) { |
q = (d1 * 0xcd) >> 11; |
d1 = d1 - 10*q; |
*buf++ = d1 + '0'; /* next digit */ |
|
d2 = q + 2*d2; |
if ((d2 != 0) || (d3 != 0)) { |
q = (d2 * 0xd) >> 7; |
d2 = d2 - 10*q; |
*buf++ = d2 + '0'; /* next digit */ |
|
d3 = q + 4*d3; |
if (d3 != 0) { |
q = (d3 * 0xcd) >> 11; |
d3 = d3 - 10*q; |
*buf++ = d3 + '0'; /* next digit */ |
if (q != 0) |
*buf++ = q + '0'; /* most sign. digit */ |
} |
} |
} |
|
return buf; |
} |
/* Same with if's removed. Always emits five digits */ |
static noinline_for_stack |
char *put_dec_full(char *buf, unsigned q) |
{ |
/* BTW, if q is in [0,9999], 8-bit ints will be enough, */ |
/* but anyway, gcc produces better code with full-sized ints */ |
unsigned d3, d2, d1, d0; |
d1 = (q>>4) & 0xf; |
d2 = (q>>8) & 0xf; |
d3 = (q>>12); |
|
/* |
* Possible ways to approx. divide by 10 |
* gcc -O2 replaces multiply with shifts and adds |
* (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) |
* (x * 0x67) >> 10: 1100111 |
* (x * 0x34) >> 9: 110100 - same |
* (x * 0x1a) >> 8: 11010 - same |
* (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) |
*/ |
d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
q = (d0 * 0xcd) >> 11; |
d0 = d0 - 10*q; |
*buf++ = d0 + '0'; |
d1 = q + 9*d3 + 5*d2 + d1; |
q = (d1 * 0xcd) >> 11; |
d1 = d1 - 10*q; |
*buf++ = d1 + '0'; |
|
d2 = q + 2*d2; |
q = (d2 * 0xd) >> 7; |
d2 = d2 - 10*q; |
*buf++ = d2 + '0'; |
|
d3 = q + 4*d3; |
q = (d3 * 0xcd) >> 11; /* - shorter code */ |
/* q = (d3 * 0x67) >> 10; - would also work */ |
d3 = d3 - 10*q; |
*buf++ = d3 + '0'; |
*buf++ = q + '0'; |
|
return buf; |
} |
/* No inlining helps gcc to use registers better */ |
static noinline_for_stack |
char *put_dec(char *buf, unsigned long long num) |
{ |
while (1) { |
unsigned rem; |
if (num < 100000) |
return put_dec_trunc(buf, num); |
rem = do_div(num, 100000); |
buf = put_dec_full(buf, rem); |
} |
} |
|
#define ZEROPAD 1 /* pad with zero */ |
#define SIGN 2 /* unsigned/signed long */ |
#define PLUS 4 /* show plus */ |
#define SPACE 8 /* space if plus */ |
#define LEFT 16 /* left justified */ |
#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ |
|
enum format_type { |
FORMAT_TYPE_NONE, /* Just a string part */ |
FORMAT_TYPE_WIDTH, |
FORMAT_TYPE_PRECISION, |
FORMAT_TYPE_CHAR, |
FORMAT_TYPE_STR, |
FORMAT_TYPE_PTR, |
FORMAT_TYPE_PERCENT_CHAR, |
FORMAT_TYPE_INVALID, |
FORMAT_TYPE_LONG_LONG, |
FORMAT_TYPE_ULONG, |
FORMAT_TYPE_LONG, |
FORMAT_TYPE_UBYTE, |
FORMAT_TYPE_BYTE, |
FORMAT_TYPE_USHORT, |
FORMAT_TYPE_SHORT, |
FORMAT_TYPE_UINT, |
FORMAT_TYPE_INT, |
FORMAT_TYPE_NRCHARS, |
FORMAT_TYPE_SIZE_T, |
FORMAT_TYPE_PTRDIFF |
}; |
|
struct printf_spec { |
u8 type; /* format_type enum */ |
u8 flags; /* flags to number() */ |
u8 base; /* number base, 8, 10 or 16 only */ |
u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ |
s16 field_width; /* width of output field */ |
s16 precision; /* # of digits/chars */ |
}; |
|
static noinline_for_stack |
char *number(char *buf, char *end, unsigned long long num, |
struct printf_spec spec) |
{ |
/* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ |
|
char tmp[66]; |
char sign; |
char locase; |
int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
int i; |
|
/* locase = 0 or 0x20. ORing digits or letters with 'locase' |
* produces same digits or (maybe lowercased) letters */ |
locase = (spec.flags & SMALL); |
if (spec.flags & LEFT) |
spec.flags &= ~ZEROPAD; |
sign = 0; |
if (spec.flags & SIGN) { |
if ((signed long long)num < 0) { |
sign = '-'; |
num = -(signed long long)num; |
spec.field_width--; |
} else if (spec.flags & PLUS) { |
sign = '+'; |
spec.field_width--; |
} else if (spec.flags & SPACE) { |
sign = ' '; |
spec.field_width--; |
} |
} |
if (need_pfx) { |
spec.field_width--; |
if (spec.base == 16) |
spec.field_width--; |
} |
|
/* generate full string in tmp[], in reverse order */ |
i = 0; |
if (num == 0) |
tmp[i++] = '0'; |
/* Generic code, for any base: |
else do { |
tmp[i++] = (digits[do_div(num,base)] | locase); |
} while (num != 0); |
*/ |
else if (spec.base != 10) { /* 8 or 16 */ |
int mask = spec.base - 1; |
int shift = 3; |
|
if (spec.base == 16) |
shift = 4; |
do { |
tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
num >>= shift; |
} while (num); |
} else { /* base 10 */ |
i = put_dec(tmp, num) - tmp; |
} |
|
/* printing 100 using %2d gives "100", not "00" */ |
if (i > spec.precision) |
spec.precision = i; |
/* leading space padding */ |
spec.field_width -= spec.precision; |
if (!(spec.flags & (ZEROPAD+LEFT))) { |
while (--spec.field_width >= 0) { |
if (buf < end) |
*buf = ' '; |
++buf; |
} |
} |
/* sign */ |
if (sign) { |
if (buf < end) |
*buf = sign; |
++buf; |
} |
/* "0x" / "0" prefix */ |
if (need_pfx) { |
if (buf < end) |
*buf = '0'; |
++buf; |
if (spec.base == 16) { |
if (buf < end) |
*buf = ('X' | locase); |
++buf; |
} |
} |
/* zero or space padding */ |
if (!(spec.flags & LEFT)) { |
char c = (spec.flags & ZEROPAD) ? '0' : ' '; |
while (--spec.field_width >= 0) { |
if (buf < end) |
*buf = c; |
++buf; |
} |
} |
/* hmm even more zero padding? */ |
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, char ext) |
{ |
unsigned long value = (unsigned long) ptr; |
#ifdef CONFIG_KALLSYMS |
char sym[KSYM_SYMBOL_LEN]; |
if (ext != 'f' && ext != 's') |
sprint_symbol(sym, value); |
else |
kallsyms_lookup(value, NULL, NULL, NULL, sym); |
|
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 *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; |
|
if (fmt[1] == 'F') { /* FDDI canonical format */ |
separator = '-'; |
} else { |
separator = ':'; |
} |
|
for (i = 0; i < 6; i++) { |
p = pack_hex_byte(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_trunc(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 *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); |
} |
|
|
int kptr_restrict = 1; |
|
/* |
* 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 |
* - '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 |
* - '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/draft-ietf-6man-text-addr-representation-00 |
* - '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 |
* |
* 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) |
{ |
if (!ptr) { |
/* |
* Print (null) with the same width as a pointer so it makes |
* tabular output look nice. |
*/ |
if (spec.field_width == -1) |
spec.field_width = 2 * sizeof(void *); |
return string(buf, end, "(null)", spec); |
} |
|
switch (*fmt) { |
case 'F': |
case 'f': |
ptr = dereference_function_descriptor(ptr); |
/* Fallthrough */ |
case 'S': |
case 's': |
return symbol_string(buf, end, ptr, spec, *fmt); |
case 'R': |
case 'r': |
return resource_string(buf, end, ptr, spec, fmt); |
case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
case 'm': /* Contiguous: 000102030405 */ |
/* [mM]F (FDDI, bit reversed) */ |
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 '4': |
return ip4_addr_string(buf, end, ptr, spec, fmt); |
} |
break; |
case 'V': |
return buf + vsnprintf(buf, end - buf, |
((struct va_format *)ptr)->fmt, |
*(((struct va_format *)ptr)->va)); |
} |
spec.flags |= SMALL; |
if (spec.field_width == -1) { |
spec.field_width = 2 * sizeof(void *); |
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 |
* %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 |
* %pm output a 6-byte MAC address without colons |
* %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 |
* http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
* %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
* case. |
* %n is ignored |
* |
* 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. |
* |
* Call this function if you are already dealing with a va_list. |
* You probably want snprintf() instead. |
*/ |
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 ((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: |
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); |
|
int vsprintf(char *buf, const char *fmt, va_list args) |
{ |
return vsnprintf(buf, INT_MAX, fmt, args); |
} |
|
|
/** |
* 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); |
|
|
/** |
* 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; |
} |
|