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ft_split.c
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ft_split.c
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/* ************************************************************************** */
/* */
/* :::::::: */
/* ft_split.c :+: :+: */
/* +:+ */
/* By: fbes <[email protected]> +#+ */
/* +#+ */
/* Created: 2020/10/27 15:41:13 by fbes #+# #+# */
/* Updated: 2022/02/08 19:48:05 by fbes ######## odam.nl */
/* */
/* ************************************************************************** */
#include <stdlib.h>
#include "libft.h"
static size_t ft_getsepsamount(char const *s, char c)
{
size_t amount;
size_t i;
amount = 0;
i = 0;
while (s[i] != '\0')
{
if (i > 0 && s[i] == c && s[i - 1] != c)
amount++;
else if (s[i] != c && s[i + 1] == '\0')
amount++;
i++;
}
return (amount);
}
static char **ft_getpartsstart(char const *s, char c, size_t amount)
{
size_t i;
size_t j;
char **ret;
ret = (char **)malloc((amount + 1) * sizeof(char *));
if (ret)
{
i = 0;
j = 0;
while (s[i] != '\0')
{
if (i == 0 && s[i] != c)
{
ret[j] = (char *)&s[i];
j++;
}
else if (i > 0 && s[i] != c && s[i - 1] == c)
{
ret[j] = (char *)&s[i];
j++;
}
i++;
}
}
return (ret);
}
static char **ft_getpartsend(char const *s, char c, size_t amount)
{
size_t i;
size_t j;
char **ret;
ret = (char **)malloc((amount + 1) * sizeof(char *));
if (ret)
{
i = 0;
j = 0;
while (s[i] != '\0')
{
if (i > 0 && s[i] == c && s[i - 1] != c)
{
ret[j] = (char *)&s[i];
j++;
}
else if (i > 0 && s[i] != c && s[i + 1] == '\0')
{
ret[j] = (char *)&s[i + 1];
j++;
}
i++;
}
}
return (ret);
}
static char **splitfree(char **arr, char **p_s, char **p_e, size_t amount)
{
size_t i;
if (arr)
{
i = 0;
while (i < amount)
{
if (arr[i])
free(arr[i]);
i++;
}
free(arr);
}
if (p_s)
free(p_s);
if (p_e)
free(p_e);
return (NULL);
}
/**
* Split a string on certain characters
* @param[in] *s The string to split
* @param[in] c The character to split the string at
* @return An array of strings containing the split up string,
* NULL on error, array ends with NULL
*/
char **ft_split(char const *s, char c)
{
char **arr;
char **p_start;
char **p_end;
size_t i;
size_t p_amount;
p_amount = ft_getsepsamount(s, c);
arr = (char **)malloc((p_amount + 1) * sizeof(char *));
if (!arr)
return (NULL);
p_start = ft_getpartsstart(s, c, p_amount);
p_end = ft_getpartsend(s, c, p_amount);
i = 0;
if (!p_start || !p_end)
return (splitfree(arr, p_start, p_end, p_amount));
while (i < p_amount)
{
arr[i] = ft_substr(s, p_start[i] - s, p_end[i] - p_start[i]);
if (!arr[i])
return (splitfree(arr, p_start, p_end, p_amount));
i++;
}
splitfree(NULL, p_start, p_end, p_amount);
arr[i] = 0;
return (arr);
}