_atoi.c

#include "shell.h"
/**
 * _atoi - Convert a string to an integer
 * @s: string to convert
 *
 * Return: The integer
 */
int _atoi(char *s)
{
int i, start, negative;
unsigned int number;

start = -1;
negative = 0;
number = 0;
for (i = 0; s[i] != '\0'; i++)
{
if (s[i] >= '0' && s[i] <= '9')
start = i;
if (s[i] == '-' && start == -1)
{
if (negative)
negative = 0;
else
negative = 1;
}
}
if (start != -1)
{
for (i = 0; s[i] != '\0'; i++)
{
if (s[i] >= '0' && s[i] <= '9')
number = number * 10 + s[i] - '0';
else if (s[i - 1] >= '0' && s[i - 1] <= '9')
break;
}
}
if ((number >= (unsigned int) INT_MAX && negative == 0))
return (INT_MAX);
else if ((number > (unsigned int) INT_MAX && negative))
return (INT_MIN);
else if (negative)
return ((int) -number);
else
return ((int) number);
}