copy_string.c

来自「Q921的LINUX下的驱动源码」· C语言 代码 · 共 43 行

/*
 * libpri: An implementation of Primary Rate ISDN
 *
 * Written by Mark Spencer <[e-mail]>
 *
 * Copyright (C) 2005, Digium
 * All Rights Reserved.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA. 
 *
 */
 
#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';
}