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ft_strlcat.c
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ft_strlcat.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_strlcat.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: akyoshid <akyoshid@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/11/16 15:16:48 by akyoshid #+# #+# */
/* Updated: 2023/11/18 09:31:29 by akyoshid ### ########.fr */
/* */
/* ************************************************************************** */
// === BEHAVIOR ===
// Append string src to the end of dst.
// Append at most dstsize - strlen(dst) - 1 characters.
// Always be NULL-terminate.
// === RETURN VALUE ===
// Return the total length of the string it tried to create.
// --- if (dstsize <= strlen(dst)) ---
// = If there is NO SPACE in the buffer of dst
// → return (dstsize + strlen(src))
// --- if (dstsize > strlen(dst)) ---
// = If there is SPACE in the buffer of dst
// → return (strlen(dst) + strlen(src))
// === JUDGMENT BASED ON RETURN VALUE ===
// --- If the return value is less than dstsize ---
// Completely appended.
// --- If the return value is equal to or greater than dstsize ---
// src is truncated or not appended with anything in dst.
// === CAUTION ===
// If the dstsize is 0, it returns strlen(src) even if dst is NULL.
#include "libft.h"
size_t ft_strlcat(char *dst, const char *src, size_t dstsize)
{
size_t dlen;
size_t slen;
size_t i;
slen = ft_strlen(src);
if (dstsize == 0)
return (slen);
dlen = ft_strlen(dst);
if (dstsize <= dlen)
return (dstsize + slen);
i = 0;
while (src[i] != '\0' && dlen + i < dstsize - 1)
{
dst[dlen + i] = src[i];
i++;
}
dst[dlen + i] = '\0';
return (dlen + slen);
}
// int main(void)
// {
// char str1[100] = "abcdefg";
// char str2[100] = "1234567890";
// // printf("%lu : %s\n", ft_strlcat(str1, str2, sizeof(str1)), str1);
// // printf("%lu : %s\n", strlcat(str1, str2, sizeof(str1)), str1);
// // printf("%lu : %s\n", ft_strlcat(NULL, str2, 10), str1);
// // printf("%lu : %s\n", strlcat(NULL, str2, 10), str1);
// // printf("%lu : %s\n", ft_strlcat(NULL, str2, 0), str1);
// // printf("%lu : %s\n", strlcat(NULL, str2, 0), str1);
// // printf("%lu : %s\n", ft_strlcat(str1, NULL, 10), str1);
// // printf("%lu : %s\n", strlcat(str1, NULL, 10), str1);
// // printf("%lu : %s\n", ft_strlcat(str1, NULL, 0), str1);
// // printf("%lu : %s\n", strlcat(str1, NULL, 0), str1);
// // printf("%lu : %s\n", ft_strlcat(str1, str2, 0), str1);
// // printf("%lu : %s\n", strlcat(str1, str2, 0), str1);
// return (0);
// }