ft_itoa.c File Reference

#include <stdlib.h>

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Functions
char *	ft_itoa (int n)
	Converts an integer to a newly allocated decimal string.
static size_t	ft_num_len (int n)
	Computes the number of characters needed for an int string.

Function Documentation

ft_itoa()

char * ft_itoa

(

int

n

)

Converts an integer to a newly allocated decimal string.

Parameters

n	Integer value to convert.

Returns

Newly allocated string, or NULL on allocation failure.

Definition at line 23 of file ft_itoa.c.

{
    char            *str;
    size_t          len;
    unsigned int    nb;
 
    len = ft_num_len(n);
    str = (char *)malloc(sizeof(char) * (len + 1));
    if (!str)
        return (NULL);
    str[len] = '\0';
    if (n < 0)
    {
        str[0] = '-';
        nb = -n;
    }
    else
        nb = n;
    if (nb == 0)
        str[0] = '0';
    while (nb != 0)
    {
        str[--len] = (nb % 10) + '0';
        nb /= 10;
    }
    return (str);
}

References ft_num_len().

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ft_num_len()

static size_t ft_num_len ( int  n )

static

Computes the number of characters needed for an int string.

Includes one extra character for a sign or for the value zero.

Parameters

n	Integer value.

Returns

Required string length without the terminating null byte.

Definition at line 59 of file ft_itoa.c.

{
    size_t  len;
 
    len = 0;
    if (n <= 0)
        len++;
    while (n != 0)
    {
        n /= 10;
        len++;
    }
    return (len);
}

Referenced by ft_itoa().

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