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pipex_utils2.c
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pipex_utils2.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* pipex_utils2.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: mac <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/02/17 13:35:40 by mac #+# #+# */
/* Updated: 2022/02/21 17:06:22 by mac ### ########.fr */
/* */
/* ************************************************************************** */
#include "pipex.h"
char *path_checker(char *cmd, char **env)
{
char **all_paths;
char *path;
char *part_of_path;
int i;
if (cmd[0] == '/')
{
if (access(cmd, X_OK))
perror("Permission denied: ");
}
i = 0;
while (ft_strnstr(env[i], "PATH", 4) == 0)
i++;
all_paths = ft_split(env[i] + 5, ':');
i = 0;
while (all_paths[i])
{
part_of_path = ft_strjoin(all_paths[i], "/");
path = ft_strjoin(part_of_path, cmd);
free(part_of_path);
if (access(path, F_OK) == 0)
return (path);
i++;
}
return (0);
}
char *ft_strnstr(const char *haystack, const char *needle, size_t len)
{
size_t i;
char *s;
size_t neelen;
i = 0;
s = (char *)haystack;
neelen = ft_strlen(needle);
if (!*needle)
return ((char *)haystack);
while (s[i] != '\0' && i + neelen <= len)
{
if (ft_strncmp(haystack, needle, neelen) == 0)
return ((char *)haystack);
i++;
haystack++;
}
return (NULL);
}
int count_words(const char *s, char c)
{
int i;
int res;
i = 0;
res = 0;
if (c)
{
while (s[i])
{
if (s[i] != c)
res++;
while (s[i] != c && s[i])
i++;
while (s[i] == c)
i++;
}
}
else
res = 0;
return (res);
}
int words_len(const char *s, char c)
{
int i;
i = 0;
while (s[i])
{
if (s[i] == c)
return (i);
i++;
}
return (i);
}
char **ft_split(const char *s, char c)
{
char **tab;
int i;
if (!s)
return (NULL);
tab = (char **)malloc(sizeof(char *) * (count_words(s, c) + 1));
if (!tab)
return (NULL);
i = 0;
while (*s)
{
while (*s == c)
s++;
if (*s != c && *s)
{
tab[i] = ft_substr(s, 0, words_len(s, c));
s = s + words_len(s, c);
i++;
}
}
tab[i] = NULL;
return (tab);
}