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/*
Libft Copyright (C) 2026 yctct
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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "libft.h"
char *ft_strnstr(const char *big, const char *little, size_t len)
{
unsigned long i;
int j;
if (ft_strlen(little) <= 0)
return ((char *)(big));
i = 0;
while (big[i] != '\0' && i < len)
{
if (big[i] == little[0])
{
j = 0;
while (big[i + j] == little[j] && little[j] && (i + j) < len)
j++;
if (little[j] == '\0')
return ((char *)(&big[i]));
}
i++;
}
return (NULL);
}
/*
#include <bsd/string.h>
#include <stdio.h>
#include <string.h>
int main(void)
{
const char *largestring = "Foo Bar Caz";
const char *smallstring = "Bar";
const char *empty_smallstring = "";
const char *largestring2 = "Foo Baz Caz";
const char *smallstring2 = "Bar";
const char *largestring3 = "Foo Bar Baz";
const char *smallstring3 = "Baz";
printf(" the big string is: %s\n", largestring);
printf("the small string is: %s\n", smallstring);
printf(" strnstr: %s\n",
strnstr(largestring, smallstring, 7));
printf(" ft_strnstr: %s\n",
ft_strnstr(largestring, smallstring, 7));
printf("----------------------------------
---------------------------------\n");
printf("When the small string is empty,
the function returns the big string\n");
printf(" the big string is: %s\n", largestring);
printf("the small string is: %s\n", empty_smallstring);
printf(" strnstr: %s\n",
strnstr(largestring, empty_smallstring, 7));
printf(" ft_strnstr: %s\n",
ft_strnstr(largestring, empty_smallstring, 7));
printf("------------------------------
-------------------------------------\n");
printf("When the little string occurs
nowhere in big, NULL is returned\n");
printf(" the big string is: %s\n", largestring2);
printf("the small string is: %s\n", smallstring2);
printf(" strnstr: %s\n",
strnstr(largestring2, smallstring2, 7));
printf(" ft_strnstr: %s\n",
ft_strnstr(largestring2, smallstring2, 7));
printf("-------------------------------
------------------------------------\n");
printf("When the little string occurs
at the end of big\n");
printf(" the big string is: %s\n", largestring3);
printf("the small string is: %s\n", smallstring3);
printf(" strnstr: %s\n",
strnstr(largestring3, smallstring3, 11));
printf(" ft_strnstr: %s\n",
ft_strnstr(largestring3, smallstring3, 11));
printf("-----------------------------------
--------------------------------\n");
printf("When length is smaller than
necessary to print little\n");
printf(" the big string is: %s\n", largestring3);
printf("the small string is: %s\n", smallstring3);
printf(" strnstr: %s\n",
strnstr(largestring3, smallstring3, 10));
printf(" ft_strnstr: %s\n",
ft_strnstr(largestring3, smallstring3, 10));
printf("----------------------------
---------------------------------------\n");
printf("When length is zero\n");
printf(" the big string is: %s\n", largestring3);
printf("the small string is: %s\n", smallstring3);
printf(" strnstr: %s\n",
strnstr(largestring3, smallstring3, 0));
printf(" ft_strnstr: %s\n",
ft_strnstr(largestring3, smallstring3, 0));
}
*/
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