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ft_substr.c
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ft_substr.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_substr.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: polmarti <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/09/21 10:21:22 by polmarti #+# #+# */
/* Updated: 2023/10/05 13:58:33 by polmarti ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
char *ft_substr(char const *s, unsigned int start, size_t len)
{
char *dst;
if (!s)
return (0);
if (len > (ft_strlen(s) - (size_t)start))
len = ft_strlen(s) - (size_t)start;
if (start >= ft_strlen(s))
{
dst = ft_strdup("");
if (!dst)
return (0);
return (dst);
}
dst = (char *)ft_calloc(sizeof(char), len + 1);
if (!dst)
return (0);
dst = ft_memcpy(dst, s + start, len);
return (dst);
}
/*#include <stdio.h>
#include <stdlib.h>
int main()
{
//char str[] = "lorem ipsum dolor sit amet";
char *sub;
//size_t size = 20;
sub = ft_substr("hola", 4, 1);
printf("%s\n", sub);
free(sub);
return (0);
}*/
// h o l a
/*comentarios
23 el string viene vacio?
25 CASO LIMITE OVERLAP 1 > (4-2) = 1 (empieza en la posicion 2 y copia 1 veces,
pero el string desde la posicion solo puede copia 2 veces sin hacer overlap,
entonces se reasigna en len para evitar el overlap)
28 start es mayor que el final o igual que el final del string? CASO LIMITE
29 RETORNO UN PUNTERO VACIO
*/