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instructions.c
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instructions.c
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#include "monty.h"
/**
* push - opcode push pushes an element to the stack and print
* the data pushed to the stdout
* Usage: push <int>
* @stack: the top of the stack
* @line_number: current line number of the monty file
* Return: void
*/
void push(stack_t **stack, unsigned int line_number)
{
stack_t *monty = *stack;
extern stack_t *top;
extern char *arg;
int data;
stack_t *new;
if (arg == NULL || !is_int(arg))
{
fprintf(stderr, "L%d: usage: push integer\n", line_number);
fail_exit(EXIT_FAILURE);
}
data = atoi(arg);
new = malloc(sizeof(stack_t));
check_malloc(new);
new->n = data;
new->prev = monty;
new->next = NULL;
if (monty == NULL)
{
top = new;
}
else
{
monty->next = new;
top = new;
}
}
/**
* pall - prints all values on the stack starting, starting from the top of the stack
* @stack: top of the stack
* @line_number: current line number of the monty file
* Return: void
*/
void pall(stack_t **stack, unsigned int line_number)
{
stack_t *current;
current = *stack;
if (current == NULL)
fprintf(stderr, "L:%d Error: can't print stack with null", line_number);
while (current != NULL)
{
printf("%d\n", current->n);
current = current->prev;
}
}
/**
* pint - print teh value at the top of the stack followed by a new line
* @stack: top of the stack
* @line_number: current line number of the monty file
* Return: void
*/
void pint(stack_t **stack, unsigned int line_number)
{
stack_t *top = *stack;
if (top == NULL)
{
fprintf(stderr, "L%d: can't pint, stack empty", line_number);
fail_exit(EXIT_FAILURE);
}
printf("%d\n", top->n);
}