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ft_ultoa.c
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ft_ultoa.c
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#include "header.h"
static size_t ft_strlen(char *str)
{
size_t i;
i = 0;
while (str[i])
++i;
return (i);
}
static size_t count_numlen(unsigned long int nbr, size_t baselen)
{
size_t nbr_len;
nbr_len = 0;
while (nbr)
{
nbr /= baselen;
++nbr_len;
}
return (nbr_len);
}
static int is_base_valid(char *base)
{
int i;
int j;
int len;
len = ft_strlen(base);
if (!base || len < 2 || len > 16)
return (0);
i = 0;
while (base[i])
{
if (base[i] == '-' || base[i] == '+')
return (0);
j = i + 1;
while (base[j])
{
if (base[i] == base[j])
return (0);
++j;
}
++i;
}
return (1);
}
char *ft_ultoa(unsigned long int nbr, char *base)
{
char *num;
size_t numlen;
size_t baselen;
if (!is_base_valid(base))
return (NULL);
baselen = ft_strlen(base);
numlen = count_numlen(nbr, baselen);
num = (char *) malloc(sizeof(char) * numlen + (!nbr) + 1);
if (!num)
return (NULL);
num[numlen + (!nbr)] = 0;
if (!nbr)
num[0] = '0';
while (nbr)
{
num[--numlen] = base[nbr % baselen];
nbr /= baselen;
}
return (num);
}