aux_stdlib.c

#include "main.h"

/**
 * get_len - Get the lenght of a number.
 * @n: type int number.
 * Return: Lenght of a number.
 */
int get_len(int n)
{
  unsigned int n1;
  int lenght = 1;

  if (n < 0)
    {
      lenght++;
      n1 = n * -1;
    }
  else
    {
      n1 = n;
    }
  while (n1 > 9)
    {
      lenght++;
      n1 = n1 / 10;
    }

  return (lenght);
}
/**
 * aux_itoa - function converts int to string.
 * @n: type int number
 * Return: String.
 */
char *aux_itoa(int n)
{
  unsigned int n1;
  int lenght = get_len(n);
  char *buffer;

  buffer = malloc(sizeof(char) * (lenght + 1));
  if (buffer == 0)
    return (NULL);

  *(buffer + lenght) = '\0';

  if (n < 0)
    {
      n1 = n * -1;
      buffer[0] = '-';
    }
  else
    {
      n1 = n;
    }

  lenght--;
  do {
    *(buffer + lenght) = (n1 % 10) + '0';
    n1 = n1 / 10;
    lenght--;
  }
  while (n1 > 0)
    ;
  return (buffer);
}

/**
 * _atoi - converts a string to an integer.
 * @s: input string.
 * Return: integer.
 */
int _atoi(char *s)
{
  unsigned int count = 0, size = 0, oi = 0, pn = 1, m = 1, i;

  while (*(s + count) != '\0')
    {
      if (size > 0 && (*(s + count) < '0' || *(s + count) > '9'))
	break;

      if (*(s + count) == '-')
	pn *= -1;

      if ((*(s + count) >= '0') && (*(s + count) <= '9'))
	{
	  if (size > 0)
	    m *= 10;
	  size++;
	}
      count++;
    }

  for (i = count - size; i < count; i++)
    {
      oi = oi + ((*(s + i) - 48) * m);
      m /= 10;
    }
  return (oi * pn);
}