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ft_strtrim.c
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ft_strtrim.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strtrim.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: alsantia <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2021/02/13 10:20:11 by alsantia #+# #+# */
/* Updated: 2021/02/17 18:26:30 by alsantia ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
static char is_in_set(char const *set, char c)
{
while (*set)
if (*set++ == c)
return (1);
return (0);
}
static size_t ft_find_start(char const *s1, char const *set)
{
size_t start;
size_t len_s1;
len_s1 = ft_strlen(s1);
start = 0;
while (is_in_set(set, *s1) && *s1)
{
start++;
s1++;
}
if (start >= len_s1)
start = 0;
return (start);
}
static size_t ft_find_end(char const *s1, char const *set)
{
size_t end;
char *temp;
temp = (char *)s1;
end = ft_strlen(s1);
temp += end;
while (is_in_set(set, *--temp) && end--)
;
return (end);
}
char *ft_strtrim(char const *s1, char const *set)
{
size_t size;
char *res;
char *begin;
if (!set || !s1)
return (NULL);
size = ft_find_end(s1, set) - ft_find_start(s1, set);
res = (char *)malloc(size + 1);
if (!res)
return (NULL);
begin = res;
s1 += ft_find_start(s1, set);
while (size--)
*res++ = *s1++;
*res = '\0';
return (begin);
}