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linkpath.c
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linkpath.c
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#include "shell.h"
/**
* _getenv - gets the value of the global variable
* @name: name of the global variable
* Return: string of value
*/
char *_getenv(const char *name)
{
int i, j;
char *value;
if (!name)
return (NULL);
for (i = 0; environ[i]; i++)
{
j = 0;
if (name[j] == environ[i][j])
{
while (name[j])
{
if (name[j] != environ[i][j])
break;
j++;
}
if (name[j] == '\0')
{
value = (environ[i] + j + 1);
return (value);
}
}
}
return (0);
}
/**
* add_node_end - adds a new node at the end of a list_t list
* @head: pointer to pointer to our linked list
* @str: pointer to string in previous first node
* Return: address of the new element/node
*/
list_path *add_node_end(list_path **head, char *str)
{
list_path *tmp;
list_path *new;
new = malloc(sizeof(list_path));
if (!new || !str)
{
return (NULL);
}
new->dir = str;
new->p = '\0';
if (!*head)
{
*head = new;
}
else
{
tmp = *head;
while (tmp->p)
{
tmp = tmp->p;
}
tmp->p = new;
}
return (*head);
}
/**
* linkpath - creates a linked list for path directories
* @path: string of path value
* Return: pointer to the created linked list
*/
list_path *linkpath(char *path)
{
list_path *head = '\0';
char *token;
char *cpath = _strdup(path);
token = strtok(cpath, ":");
while (token)
{
head = add_node_end(&head, token);
token = strtok(NULL, ":");
}
return (head);
}
/**
* _which - finds the pathname of a filename
* @filename: name of file or command
* @head: head of linked list of path directories
* Return: pathname of filename or NULL if no match
*/
char *_which(char *filename, list_path *head)
{
struct stat st;
char *string;
list_path *tmp = head;
while (tmp)
{
string = concat_all(tmp->dir, "/", filename);
if (stat(string, &st) == 0)
{
return (string);
}
free(string);
tmp = tmp->p;
}
return (NULL);
}
/**
* free_list - frees a list_t
*@head: pointer to our linked list
*/
void free_list(list_path *head)
{
list_path *storage;
while (head)
{
storage = head->p;
free(head->dir);
free(head);
head = storage;
}
}