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ft_strtrim.c
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ft_strtrim.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strtrim.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: achraiti <achraiti@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/11/01 14:17:25 by achraiti #+# #+# */
/* Updated: 2023/11/06 18:43:01 by achraiti ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static int check_set(char c, char const *set)
{
while (*set)
{
if (*set == c)
return (1);
set++;
}
return (0);
}
static int first_position(char const *s, char const *set)
{
int i;
i = 0;
while (s[i] && check_set(s[i], set))
i++;
return (i);
}
static int last_position(char const *s, char const *set)
{
int i;
i = ft_strlen(s) - 1;
while (i >= 0 && check_set(s[i], set))
i--;
return (i);
}
char *ft_strtrim(char const *s1, char const *set)
{
char *m;
int i;
int len;
int start;
if (s1 == NULL)
return (NULL);
i = 0;
len = last_position(s1, set) - first_position(s1, set) + 1;
start = first_position(s1, set);
if (len <= 0)
{
m = (char *)malloc(1);
if (!m)
return (NULL);
m[0] = '\0';
return (m);
}
m = (char *)malloc(len + 1);
if (!m)
return (NULL);
while (i < len)
m[i++] = s1[start++];
m[i] = '\0';
return (m);
}