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/* $Id: qprintf.c,v 1.1 2004/02/27 07:06:26 reinelt Exp $
*
* simple but quick snprintf() replacement
*
* Copyright 2004 Michael Reinelt <reinelt@eunet.at>
* Copyright 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* derived from a patch from Martin Hejl which is
* Copyright 2003 Martin Hejl (martin@hejl.de)
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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, or (at your option)
* any later version.
*
* LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* $Log: qprintf.c,v $
* Revision 1.1 2004/02/27 07:06:26 reinelt
* new function 'qprintf()' (simple but quick snprintf() replacement)
*
*/
/*
* exported functions:
*
* int qprintf(char *str, size_t size, const char *format, ...)
* works like snprintf(), but format only knows about %d and %s
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
static char *itoa(char* buffer, size_t size, int value)
{
char *p;
int sign;
// sanity checks
if (buffer==NULL || size<2) return (NULL);
// remember sign of value
sign = 0;
if (value < 0) {
sign = 1;
value = -value;
}
// p points to last char
p = buffer+size-1;
// set terminating zero
*p='\0';
do {
*--p = value%10 + '0';
value = value/10;
} while (value!=0 && p>buffer);
if (sign && p>buffer)
*--p = '-';
return p;
}
int qprintf(char *str, size_t size, const char *format, ...) {
va_list ap;
const char *src;
char *dst;
int len;
src = format;
dst = str;
len = 0;
// leave room for terminating zero
size--;
va_start(ap, format);
while (len < size) {
if (*src=='%') {
char buf[12], *s;
int d;
switch (*++src) {
case 's':
src++;
s = va_arg(ap, char *);
while (len < size && *s != '\0') {
len++;
*dst++ = *s++;
}
break;
case 'd':
src++;
d = va_arg(ap, int);
s = itoa (buf, sizeof(buf), d);
while (len < size && *s != '\0') {
len++;
*dst++ = *s++;
}
break;
default:
len++;
*dst++ = '%';
}
} else {
len++;
*dst++ = *src;
if (*src++ == '\0') break;
}
}
va_end(ap);
// enforce terminating zero
if (len>=size && *(dst-1)!='\0') {
len++;
*dst='\0';
}
// do not count terminating zero
return len-1;
}
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