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digit_node.c
55 lines (50 loc) · 962 Bytes
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digit_node.c
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#include "monty.h"
/**
* is_digit - fucntion to check if a string is present
* @agv: argument
* @count: current position
* Return: digit
*/
int is_digit(char *agv, unsigned int count)
{
int digit;
digit = atoi(agv);
if (digit == 0 && strcmp(agv, "0") != 0)
{
fprintf(stderr, "L%u: usage: push integer\n", count);
free_stack();
exit(EXIT_FAILURE);
}
return (digit);
}
/**
* add_node - function to add node to list
* @stack: pointer to the head of monty stack
* @agv: our integer
* Return: node
*/
stack_t *add_node(stack_t **stack, const int agv)
{
stack_t *new_size, *current;
new_size = malloc(sizeof(stack_t));
if (!new_size)
{
fprintf(stderr, "Error: malloc failed\n");
free(new_size);
return (NULL);
}
new_size->n = agv;
new_size->prev = NULL;
current = *stack;
if (!*stack)
{
new_size->next = NULL;
}
else
{
new_size->next = current;
current->prev = new_size;
}
*stack = new_size;
return (new_size);
}