lib/gstr.c

/*
 *      Copyright (C) 2002 Nikos Mavroyanopoulos
 *
 * This file is part of LIBASN1.
 *
 * The LIBTASN1 library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public   
 * License as published by the Free Software Foundation; either 
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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 <int.h>

/* These function are like strcat, strcpy. They only
 * do bound checking (they shouldn't cause buffer overruns),
 * and they always produce null terminated strings.
 *
 * They should be used only with null terminated strings.
 */
void _asn1_str_cat( char* dest, size_t dest_tot_size, const char* src) {
size_t str_size = strlen(src);
size_t dest_size = strlen(dest);

	if ( dest_tot_size - dest_size > str_size) {
		strcat( dest, src);
	} else {
		if ( dest_tot_size - dest_size > 0) {
			strncat( dest, src, (dest_tot_size - dest_size) -1);
			dest[dest_tot_size-1] = 0;
		}
	}
}

void _asn1_str_cpy( char* dest, size_t dest_tot_size, const char* src) {
size_t str_size = strlen(src);

	if ( dest_tot_size > str_size) {
		strcpy( dest, src);
	} else {
		if ( dest_tot_size > 0) {
			strncpy( dest, src, (dest_tot_size) -1);
			dest[dest_tot_size-1] = 0;
		}
	}
}

void _asn1_mem_cpy( char* dest, size_t dest_tot_size, const char* src, size_t src_size) 
{

	if ( dest_tot_size >= src_size) {
		memcpy( dest, src, src_size);
	} else {
		if ( dest_tot_size > 0) {
			memcpy( dest, src, dest_tot_size);
		}
	}
}