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/*
* This file is derived from GLIB by Thomas Sailer, <sailer@ife.ee.ethz.ch>
*
*
* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <sys/types.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
static unsigned int printf_string_upper_bound (const char *format, va_list args)
{
unsigned int len = 1;
while (*format) {
int long_int = 0;
int extra_long = 0;
char c;
c = *format++;
if (c == '%') {
int done = 0;
while (*format && !done) {
switch (*format++) {
char *string_arg;
case '*':
len += va_arg (args, int);
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
/* add specified format length, since it might exceed the
* size we assume it to have.
*/
format -= 1;
len += strtol (format, (char**) &format, 10);
break;
case 'h':
/* ignore short int flag, since all args have at least the
* same size as an int
*/
break;
case 'l':
if (long_int)
extra_long = 1; /* linux specific */
else
long_int = 1;
break;
case 'q':
case 'L':
long_int = 1;
extra_long = 1;
break;
case 's':
string_arg = va_arg (args, char *);
if (string_arg)
len += strlen (string_arg);
else {
/* add enough padding to hold "(null)" identifier */
len += 16;
}
done = 1;
break;
case 'd':
case 'i':
case 'o':
case 'u':
case 'x':
case 'X':
if (long_int)
(void) va_arg (args, long);
else
(void) va_arg (args, int);
len += extra_long ? 64 : 32;
done = 1;
break;
case 'D':
case 'O':
case 'U':
(void) va_arg (args, long);
len += 32;
done = 1;
break;
case 'e':
case 'E':
case 'f':
case 'g':
(void) va_arg (args, double);
len += extra_long ? 64 : 32;
done = 1;
break;
case 'c':
(void) va_arg (args, int);
len += 1;
done = 1;
break;
case 'p':
case 'n':
(void) va_arg (args, void*);
len += 32;
done = 1;
break;
case '%':
len += 1;
done = 1;
break;
default:
/* ignore unknow/invalid flags */
break;
}
}
}
else
len += 1;
}
return len;
}
/* WARNING: This does only work for i386 (plus a few others, but not eg. alpha) !!!! */
#define VA_COPY(x,y) (x) = (y)
static char *strdup_vprintf (const char *format, va_list args1)
{
char *buffer;
va_list args2;
VA_COPY (args2, args1);
buffer = malloc(printf_string_upper_bound (format, args1));
if (buffer)
vsprintf (buffer, format, args2);
va_end (args2);
return buffer;
}
int snprintf (char *str, size_t n, char const *fmt, ...)
{
char *printed;
va_list args;
int len;
va_start(args, fmt);
printed = strdup_vprintf (fmt, args);
va_end (args);
if (!printed)
return -1;
len = strlen(printed);
strncpy(str, printed, n);
str[n-1] = '\0';
free(printed);
return len >= n ? -1 : len;
}
int vsnprintf (char *str, size_t n, char const *fmt, va_list args)
{
char *printed;
int len;
printed = strdup_vprintf (fmt, args);
if (!printed)
return -1;
len = strlen(printed);
strncpy(str, printed, n);
str[n-1] = '\0';
free(printed);
return len >= n ? -1 : len;
}
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