728 lines
14 KiB
C
728 lines
14 KiB
C
|
|
/*
|
|
* Modified and hacked into libratbox by Aaron Sethman <androsyn@ratbox.org>
|
|
* The original headers are below..
|
|
* Note that this implementation does not process floating point numbers so
|
|
* you will likely need to fall back to using sprintf yourself to do those...
|
|
*/
|
|
|
|
/*
|
|
* linux/lib/vsprintf.c
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
/* 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 <libratbox_config.h>
|
|
#include <ratbox_lib.h>
|
|
|
|
static 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 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 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;
|
|
}
|
|
|
|
static char *
|
|
put_dec(char *buf, unsigned long long int num)
|
|
{
|
|
while(1)
|
|
{
|
|
unsigned rem;
|
|
if(num < 100000)
|
|
return put_dec_trunc(buf, num);
|
|
rem = num % 100000;
|
|
num = 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 SPECIAL 32 /* 0x */
|
|
#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
|
|
|
|
static char *
|
|
number(char *buf, char *end, unsigned long long int num, int base, int size, int precision,
|
|
int type)
|
|
{
|
|
char sign, tmp[66];
|
|
const char *digits;
|
|
/* we are called with base 8, 10 or 16, only, thus don't need "g..." */
|
|
static const char small_digits[] = "0123456789abcdefx"; /* "ghijklmnopqrstuvwxyz"; */
|
|
static const char large_digits[] = "0123456789ABCDEFX"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
|
|
int need_pfx = ((type & SPECIAL) && base != 10);
|
|
int i;
|
|
|
|
digits = (type & LARGE) ? large_digits : small_digits;
|
|
if(type & LEFT)
|
|
type &= ~ZEROPAD;
|
|
if(base < 2 || base > 36)
|
|
return NULL;
|
|
sign = 0;
|
|
if(type & SIGN)
|
|
{
|
|
if((signed long long int)num < 0)
|
|
{
|
|
sign = '-';
|
|
num = -(signed long long int)num;
|
|
size--;
|
|
}
|
|
else if(type & PLUS)
|
|
{
|
|
sign = '+';
|
|
size--;
|
|
}
|
|
else if(type & SPACE)
|
|
{
|
|
sign = ' ';
|
|
size--;
|
|
}
|
|
}
|
|
if(need_pfx)
|
|
{
|
|
size--;
|
|
if(base == 16)
|
|
size--;
|
|
}
|
|
|
|
/* 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)];
|
|
} while (num != 0);
|
|
*/
|
|
else if(base != 10)
|
|
{ /* 8 or 16 */
|
|
int mask = base - 1;
|
|
int shift = 3;
|
|
if(base == 16)
|
|
shift = 4;
|
|
do
|
|
{
|
|
tmp[i++] = digits[((unsigned char)num) & mask];
|
|
num >>= shift;
|
|
}
|
|
while(num);
|
|
}
|
|
else
|
|
{ /* base 10 */
|
|
i = put_dec(tmp, num) - tmp;
|
|
}
|
|
|
|
/* printing 100 using %2d gives "100", not "00" */
|
|
if(i > precision)
|
|
precision = i;
|
|
/* leading space padding */
|
|
size -= precision;
|
|
if(!(type & (ZEROPAD + LEFT)))
|
|
{
|
|
while(--size >= 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(base == 16)
|
|
{
|
|
if(buf < end)
|
|
*buf = digits[16]; /* for arbitrary base: digits[33]; */
|
|
++buf;
|
|
}
|
|
}
|
|
/* zero or space padding */
|
|
if(!(type & LEFT))
|
|
{
|
|
char c = (type & ZEROPAD) ? '0' : ' ';
|
|
while(--size >= 0)
|
|
{
|
|
if(buf < end)
|
|
*buf = c;
|
|
++buf;
|
|
}
|
|
}
|
|
/* hmm even more zero padding? */
|
|
while(i <= --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(--size >= 0)
|
|
{
|
|
if(buf < end)
|
|
*buf = ' ';
|
|
++buf;
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* 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
|
|
rb_vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
|
{
|
|
int len;
|
|
unsigned long long int num;
|
|
int i, base;
|
|
char *str, *end, c;
|
|
const char *s;
|
|
|
|
int flags; /* flags to number() */
|
|
|
|
int field_width; /* width of output field */
|
|
int precision; /* min. # of digits for integers; max
|
|
number of chars for from string */
|
|
int qualifier; /* '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 */
|
|
|
|
/* Reject out-of-range values early. Large positive sizes are
|
|
used for unknown buffer sizes. */
|
|
if(rb_unlikely((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;
|
|
}
|
|
|
|
for(; *fmt; ++fmt)
|
|
{
|
|
if(*fmt != '%')
|
|
{
|
|
if(str < end)
|
|
*str = *fmt;
|
|
++str;
|
|
continue;
|
|
}
|
|
|
|
/* process flags */
|
|
flags = 0;
|
|
repeat:
|
|
++fmt; /* this also skips first '%' */
|
|
switch (*fmt)
|
|
{
|
|
case '-':
|
|
flags |= LEFT;
|
|
goto repeat;
|
|
case '+':
|
|
flags |= PLUS;
|
|
goto repeat;
|
|
case ' ':
|
|
flags |= SPACE;
|
|
goto repeat;
|
|
case '#':
|
|
flags |= SPECIAL;
|
|
goto repeat;
|
|
case '0':
|
|
flags |= ZEROPAD;
|
|
goto repeat;
|
|
}
|
|
|
|
/* get field width */
|
|
field_width = -1;
|
|
if(isdigit(*fmt))
|
|
field_width = skip_atoi(&fmt);
|
|
else if(*fmt == '*')
|
|
{
|
|
++fmt;
|
|
/* it's the next argument */
|
|
field_width = va_arg(args, int);
|
|
if(field_width < 0)
|
|
{
|
|
field_width = -field_width;
|
|
flags |= LEFT;
|
|
}
|
|
}
|
|
|
|
/* get the precision */
|
|
precision = -1;
|
|
if(*fmt == '.')
|
|
{
|
|
++fmt;
|
|
if(isdigit(*fmt))
|
|
precision = skip_atoi(&fmt);
|
|
else if(*fmt == '*')
|
|
{
|
|
++fmt;
|
|
/* it's the next argument */
|
|
precision = va_arg(args, int);
|
|
}
|
|
if(precision < 0)
|
|
precision = 0;
|
|
}
|
|
|
|
/* get the conversion qualifier */
|
|
qualifier = -1;
|
|
if(*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
|
|
*fmt == 'Z' || *fmt == 'z' || *fmt == 't')
|
|
{
|
|
qualifier = *fmt;
|
|
++fmt;
|
|
if(qualifier == 'l' && *fmt == 'l')
|
|
{
|
|
qualifier = 'L';
|
|
++fmt;
|
|
}
|
|
}
|
|
|
|
/* default base */
|
|
base = 10;
|
|
|
|
switch (*fmt)
|
|
{
|
|
case 'c':
|
|
if(!(flags & LEFT))
|
|
{
|
|
while(--field_width > 0)
|
|
{
|
|
if(str < end)
|
|
*str = ' ';
|
|
++str;
|
|
}
|
|
}
|
|
c = (unsigned char)va_arg(args, int);
|
|
if(str < end)
|
|
*str = c;
|
|
++str;
|
|
while(--field_width > 0)
|
|
{
|
|
if(str < end)
|
|
*str = ' ';
|
|
++str;
|
|
}
|
|
continue;
|
|
|
|
case 's':
|
|
s = va_arg(args, char *);
|
|
if(s == NULL)
|
|
{
|
|
abort(); /* prefer blowing up vs corrupt data */
|
|
}
|
|
len = rb_strnlen(s, precision);
|
|
|
|
if(!(flags & LEFT))
|
|
{
|
|
while(len < field_width--)
|
|
{
|
|
if(str < end)
|
|
*str = ' ';
|
|
++str;
|
|
}
|
|
}
|
|
for(i = 0; i < len; ++i)
|
|
{
|
|
if(str < end)
|
|
*str = *s;
|
|
++str;
|
|
++s;
|
|
}
|
|
while(len < field_width--)
|
|
{
|
|
if(str < end)
|
|
*str = ' ';
|
|
++str;
|
|
}
|
|
continue;
|
|
|
|
case 'p':
|
|
if(field_width == -1)
|
|
{
|
|
field_width = 2 * sizeof(void *);
|
|
flags |= ZEROPAD;
|
|
}
|
|
str = number(str, end,
|
|
(unsigned long)va_arg(args, void *),
|
|
16, field_width, precision, flags);
|
|
continue;
|
|
|
|
|
|
case 'n':
|
|
/* FIXME:
|
|
* What does C99 say about the overflow case here? */
|
|
if(qualifier == 'l')
|
|
{
|
|
long *ip = va_arg(args, long *);
|
|
*ip = (str - buf);
|
|
}
|
|
else if(qualifier == 'Z' || qualifier == 'z')
|
|
{
|
|
size_t *ip = va_arg(args, size_t *);
|
|
*ip = (str - buf);
|
|
}
|
|
else
|
|
{
|
|
int *ip = va_arg(args, int *);
|
|
*ip = (str - buf);
|
|
}
|
|
continue;
|
|
|
|
case '%':
|
|
if(str < end)
|
|
*str = '%';
|
|
++str;
|
|
continue;
|
|
|
|
/* integer number formats - set up the flags and "break" */
|
|
case 'o':
|
|
base = 8;
|
|
break;
|
|
|
|
case 'X':
|
|
flags |= LARGE;
|
|
case 'x':
|
|
base = 16;
|
|
break;
|
|
|
|
case 'd':
|
|
case 'i':
|
|
flags |= SIGN;
|
|
case 'u':
|
|
break;
|
|
|
|
default:
|
|
if(str < end)
|
|
*str = '%';
|
|
++str;
|
|
if(*fmt)
|
|
{
|
|
if(str < end)
|
|
*str = *fmt;
|
|
++str;
|
|
}
|
|
else
|
|
{
|
|
--fmt;
|
|
}
|
|
continue;
|
|
}
|
|
if(qualifier == 'L')
|
|
num = va_arg(args, long long int);
|
|
else if(qualifier == 'l')
|
|
{
|
|
num = va_arg(args, unsigned long);
|
|
if(flags & SIGN)
|
|
num = (signed long)num;
|
|
}
|
|
else if(qualifier == 'Z' || qualifier == 'z')
|
|
{
|
|
num = va_arg(args, size_t);
|
|
}
|
|
else if(qualifier == 't')
|
|
{
|
|
num = va_arg(args, ptrdiff_t);
|
|
}
|
|
else if(qualifier == 'h')
|
|
{
|
|
num = (unsigned short)va_arg(args, int);
|
|
if(flags & SIGN)
|
|
num = (signed short)num;
|
|
}
|
|
else
|
|
{
|
|
num = va_arg(args, unsigned int);
|
|
if(flags & SIGN)
|
|
num = (signed int)num;
|
|
}
|
|
str = number(str, end, num, base, field_width, precision, flags);
|
|
}
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
int
|
|
rb_snprintf(char *buf, size_t size, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = rb_vsnprintf(buf, size, fmt, args);
|
|
va_end(args);
|
|
return i;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Call this function if you are already dealing with a va_list.
|
|
* You probably want sprintf() instead.
|
|
*/
|
|
int
|
|
rb_vsprintf(char *buf, const char *fmt, va_list args)
|
|
{
|
|
return rb_vsnprintf(buf, INT_MAX, fmt, args);
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
int
|
|
rb_sprintf(char *buf, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = rb_vsnprintf(buf, INT_MAX, fmt, args);
|
|
va_end(args);
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* rb_vsprintf_append()
|
|
* appends sprintf formatted string to the end of the buffer
|
|
*/
|
|
|
|
int
|
|
rb_vsprintf_append(char *str, const char *format, va_list ap)
|
|
{
|
|
size_t x = strlen(str);
|
|
return (rb_vsprintf(str + x, format, ap) + x);
|
|
}
|
|
|
|
/*
|
|
* rb_sprintf_append()
|
|
* appends sprintf formatted string to the end of the buffer
|
|
*/
|
|
int
|
|
rb_sprintf_append(char *str, const char *format, ...)
|
|
{
|
|
int x;
|
|
va_list ap;
|
|
va_start(ap, format);
|
|
x = rb_vsprintf_append(str, format, ap);
|
|
va_end(ap);
|
|
return (x);
|
|
}
|
|
|
|
/*
|
|
* rb_vsnprintf_append()
|
|
* appends sprintf formatted string to the end of the buffer but not
|
|
* exceeding len
|
|
*/
|
|
|
|
int
|
|
rb_vsnprintf_append(char *str, size_t len, const char *format, va_list ap)
|
|
{
|
|
size_t x;
|
|
if(len == 0)
|
|
return 0;
|
|
x = strlen(str);
|
|
|
|
if(len < x)
|
|
{
|
|
str[len - 1] = '\0';
|
|
return len - 1;
|
|
}
|
|
return (rb_vsnprintf(str + x, len - x, format, ap) + x);
|
|
}
|
|
|
|
/*
|
|
* rb_snprintf_append()
|
|
* appends snprintf formatted string to the end of the buffer but not
|
|
* exceeding len
|
|
*/
|
|
|
|
int
|
|
rb_snprintf_append(char *str, size_t len, const char *format, ...)
|
|
{
|
|
int x;
|
|
va_list ap;
|
|
va_start(ap, format);
|
|
x = rb_vsnprintf_append(str, len, format, ap);
|
|
va_end(ap);
|
|
return (x);
|
|
}
|