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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2025 Fredrik Gihl
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
static int
testStr(char *dest, const char *src)
{
char *tempStr = dest;
size_t str_len;
int ret = 1;
strncpy(tempStr, src, 49);
if (strcmp(tempStr, src) != 0) {
printf("strncpy failed(len=%zd). String: %s, expected: %s\n", strlen(src), tempStr, src);
ret = 0;
}
str_len = strlen(src);
if (str_len > 49) {
printf("strncpy wrote %zd to buffer 49 bytes long\n", str_len);
ret = 0;
}
while (str_len < 49) {
if (tempStr[str_len] != '\0') {
printf("strncpy didn't clear byte at %zd\n", str_len);
ret = 0;
}
str_len++;
}
return ret;
}
static char *
fillStr(size_t len, char *src, char val)
{
for (size_t i = 0; i < len; i++) {
src[i] = val + (i % 10);
}
src[len] = '\0';
return (char *)src;
}
// This function test the strncpy function so it copy a string correct.
// We copy string from 5 bytes to 40bytes, and verify that the string is copied correct.
static int
test_strncpy(void)
{
char str[100];
int ret = 1;
char src[49];
for (size_t strLen = 9; strLen < 40; strLen++) {
fillStr(99, str, 'a');
if (!testStr(str, fillStr(strLen, src, '0')))
ret = 0;
}
return ret;
}
int
main(void)
{
if (!test_strncpy())
return 1;
return 0;
}
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