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/* Dia -- an diagram creation/manipulation program
* Copyright (C) 1998 Alexander Larsson
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* This file contains some code from glib.
Here is the copyright notice:
* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include "utils.h"
int
nearest_pow (int num)
{
int n = 1;
while (n < num)
n <<= 1;
return n;
}
int
format_string_length_upper_bound (const char* fmt, va_list *args)
{ /* UTF8 ? */
int len = 0;
int short_int;
int long_int;
int done;
char *tmp;
while (*fmt)
{
char c = *fmt++;
short_int = FALSE;
long_int = FALSE;
if (c == '%')
{
done = FALSE;
while (*fmt && !done)
{
switch (*fmt++)
{
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':
fmt -= 1;
len += strtol (fmt, (char **)&fmt, 10);
break;
case 'h':
short_int = TRUE;
break;
case 'l':
long_int = TRUE;
break;
/* I ignore 'q' and 'L', they're not portable anyway. */
case 's':
tmp = va_arg(*args, char *);
if(tmp)
len += strlen (tmp);
else
len += strlen ("(null)");
done = TRUE;
break;
case 'd':
case 'i':
case 'o':
case 'u':
case 'x':
case 'X':
if (long_int)
(void)va_arg (*args, long);
else if (short_int)
(void)va_arg (*args, int);
else
(void)va_arg (*args, int);
len += 32;
done = TRUE;
break;
case 'D':
case 'O':
case 'U':
(void)va_arg (*args, long);
len += 32;
done = TRUE;
break;
case 'e':
case 'E':
case 'f':
case 'g':
(void)va_arg (*args, double);
len += 32;
done = TRUE;
break;
case 'c':
(void)va_arg (*args, int);
len += 1;
done = TRUE;
break;
case 'p':
case 'n':
(void)va_arg (*args, void*);
len += 32;
done = TRUE;
break;
case '%':
len += 1;
done = TRUE;
break;
default:
break;
}
}
}
else
len += 1;
}
return len;
}
#ifndef HAVE_SNPRINTF
int
snprintf ( char *str, size_t n, const char *format, ... )
{
static char *buf = NULL;
static int alloc = 0;
int len;
va_list args, args2;
va_start (args, format);
len = format_string_length_upper_bound (format, &args);
va_end (args);
if (len >= alloc) {
if (buf)
g_free (buf);
alloc = nearest_pow (MAX(len + 1, 1024));
buf = g_new (char, alloc);
}
va_start (args2, format);
vsprintf (buf, format, args2);
va_end (args2);
strncpy(str, buf, n);
str[n-1] = 0;
return (len >= n)?-1:strlen(str);
}
#endif
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