42_get_next_line/get_next_line_utils.c

#include "get_next_line.h"

void	*ft_calloc(size_t nmemb, size_t size)
{
	char	*tab;
	size_t	i;

	if (nmemb == 0 || size * nmemb / nmemb != size)
		return (NULL);
	tab = malloc(nmemb * size);
	if (tab == NULL)
		return (NULL);
	i = 0;
	while (i < size * nmemb)
	{
		tab[i] = 0;
		i++;
	}
	return ((void *) tab);
}

void	*ft_realloc(void *ptr, size_t size)
{
	char	*tab;
	char	*in;
	size_t	i;

	in = ptr;
	tab = ft_calloc(1, size);
	if (tab == NULL)
		return (NULL);
	if (ptr == NULL)
		return (tab);
	i = 0;
	while (in[i] != 0 && i < size)
	{
		tab[i] = in[i];
		i++;
	}
	free(ptr);
	return (tab);
}

char	*ft_strcat(char *dst, char *src)
{
	size_t	i;
	size_t	j;

	j = 0;
	while (dst[j] != '\0')
		j++;
	i = 0;
	if (src != NULL)
	{
		while (src[i] != '\0')
		{
			dst[i + j] = src[i];
			i++;
		}
	}
	dst[i] = '\0';
	return (dst);
}

char	*ft_strndup(char *src, size_t n)
{
	char	*out;
	size_t	i;

	out = ft_calloc(n + 1, sizeof(char));
	if (out == NULL)
		return (NULL);
	i = 0;
	while (src[i] != '\0' && i < n)
	{
		out[i] = src[i];
		i++;
	}
	return (out);
}