#include "shell.h"

/**

* build_linkedList - creat list.

*

* Description: This function creat a linked list for the given

* environment variable PATH and splits it to parts with strtok

* each directory in node.

*

* Return: The head of the list to access to the whole linked list.

*/

d_node *build_linkedList(void)

{

char *pathValue, *dirPath;

d_node *head = NULL, *pttr = NULL, *newDir;

pathValue = _getenv("PATH"); /* Get the value of path (all directories) */

if (pathValue == NULL)

return (NULL);

dirPath = _strtok(pathValue, ":"); /* splits each directory */

while (dirPath != NULL)

{

/* Create new node for each directory */

newDir = malloc(sizeof(struct dirNode));

newDir->directory = _strdup(dirPath); /* Take a copy form directory */

newDir->nextDir = NULL;

if (head != NULL)

{

pttr = head; /* Make pointer point to head */

while (pttr->nextDir != NULL)

pttr = pttr->nextDir; /* Reach to end of list */

/* Make the last node in list points to the new directory */

pttr->nextDir = newDir;

}

else

head = newDir; /* Make the head points to the first node */

dirPath = _strtok(NULL, ":"); /* Continue in splits the path to dirs */

}

free(pathValue); /* After build the list free the value of path */

return (head); /* and return head (access to whole list) */

}

/**

* free_list - free whole linked list

*

* @head: the head node to access for all nodes.

*

* Discription: This functoin free all nodes until reach to

* the end of list, free node value and the whole node.

*

* Return: Nothing (void)

*/

void free_list(d_node *head)

{

d_node *pntr = head, *next_node;

while (pntr != NULL)

{

next_node = pntr->nextDir; /* next_node points to the next node in list */

/* Free value of current node and the whole node */

free(pntr->directory), free(pntr);

pntr = next_node; /* Move to next directory */

}

}