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ops.c
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ops.c
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#include "monty.h"
#include <stdio.h>
#include <stdlib.h>
/**
* push - add a node(value) at the top of the stack
* @top: current top of the stack
* @val: the current line in the monty file
* @mode: mode of execution
* Return: Nothing
*/
void push(stack_t **top, int val, int mode)
{
stack_t *node, *curr;
if (!top)
return;
node = malloc(sizeof(*node));
if (!node)
{
free(node);
node = NULL;
fprintf(stderr, "Error: malloc failed\n");
exit(EXIT_FAILURE);
}
node->n = val;
node->next = NULL;
node->prev = NULL;
if (!(*top))
{
*top = node;
return;
}
if (mode)
{
(*top)->prev = node;
node->next = *top;
*top = node;
}
else
{
curr = *top;
while (curr->next)
curr = curr->next;
node->prev = curr;
curr->next = node;
}
}
/**
* pall - print all nodes(value) in the stack
* @top: top of the stack
* @line_number: the current line in the monty file
* Return: Nothing
*/
void pall(stack_t **top, unsigned int line_number)
{
stack_t *curr;
(void)line_number;
if (!top)
return;
curr = *top;
while (curr)
{
printf("%d\n", (curr)->n);
curr = curr->next;
}
}
/**
* free_stack - frees all nodes(value) from memory
* @top : top of the stack;
* Return: Nothing
*/
void free_stack(stack_t **top)
{
if (!top)
return;
while (*top)
{
stack_t *next = (*top)->next;
free(*top);
*top = next;
}
if (*top != NULL)
*top = NULL;
}
/**
* pint - prints the first node value of the stack
* @top: top of the stack
* @line_number: current line of execution
* Return: Nothing
*/
void pint(stack_t **top, unsigned int line_number)
{
if (!top || !(*top))
{
fprintf(stderr, "L%d: can't pint, stack empty\n", line_number);
exit(EXIT_FAILURE);
}
printf("%d\n", (*top)->n);
}
/**
* pop - remove the first node of the stack
* @top: top of the stack
* @line_number: current line of execution
* Return: Nothing
*/
void pop(stack_t **top, unsigned int line_number)
{
stack_t *next;
if (!top || !(*top))
{
fprintf(stderr, "L%d: can't pop an empty stack\n", line_number);
exit(EXIT_FAILURE);
}
next = (*top)->next;
free(*top);
*top = next;
}