cstr.c

/*
 * Copyright (c) 2017 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <jeffpc/error.h>
#include <jeffpc/cstr.h>

/*
 * A strlcpy-strncpy hybrid.
 *
 * Like strlcpy, it...
 *  - always nul-terminates
 *
 * Like strncpy, it...
 *  - always nul-pads
 *
 * Additionally, it returns...
 *  - -EOVERFLOW on error
 *  - 0 otherwise
 */
int strcpy_safe(char *dst, const char *str, size_t dstsize)
{
	strncpy(dst, str, dstsize);

	if (dst[dstsize - 1] == '\0')
		return 0;

	dst[dstsize - 1] = '\0';
	return -EOVERFLOW;
}