copy_string.c

来自「Q.931/Q.921 source code compiles」· C语言 代码 · 共 48 行

/*
 * libpri: An implementation of Primary Rate ISDN
 *
 * Written by Mark Spencer <[e-mail]>
 *
 * Copyright (C) 2005, Digium, Inc.
 * All Rights Reserved.
 */

/*
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2 as published by the
 * Free Software Foundation. See the LICENSE file included with
 * this program for more details.
 *
 * In addition, when this program is distributed with Asterisk in
 * any form that would qualify as a 'combined work' or as a
 * 'derivative work' (but not mere aggregation), you can redistribute
 * and/or modify the combination under the terms of the license
 * provided with that copy of Asterisk, instead of the license
 * terms granted here.
 */
 
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

#include "compiler.h"
#include "libpri.h"
#include "pri_internal.h"

void libpri_copy_string(char *dst, const char *src, size_t size)
{
	while (*src && size) {
		*dst++ = *src++;
		size--;
	}
	if (__builtin_expect(!size, 0))
		dst--;
	*dst = '\0';
}