106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* ft_substr.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: hulamy <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2019/12/01 16:00:10 by hulamy #+# #+# */
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/* Updated: 2022/05/04 14:07:05 by pblagoje ### ########.fr */
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/* */
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/* ************************************************************************** */
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/*
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** create a copy of a portion of s, begining at start and of length len
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*/
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/*
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** #include <unistd.h>
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** #include <stdlib.h>
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** #include <stdio.h>
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**
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** char *ft_substr(char const *s, unsigned int start, size_t len);
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**
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** char *ft_strdup(const char *src)
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** {
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** int i;
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** char *str;
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**
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** i = 0;
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** while (src[i] != '\0')
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** i++;
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** if (!(str = (char*)malloc(sizeof(*str) * (i + 1))))
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** return (NULL);
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** while (i-- >= 0)
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** str[i + 1] = src[i + 1];
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** return (str);
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** }
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**
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** int ft_strncmp(const char *s1, const char *s2, size_t n)
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** {
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** size_t i;
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** int res;
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**
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** i = 0;
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** res = 0;
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** while (s1[i] && s1[i] == s2[i] && i < n - 1)
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** i++;
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** if (n != 0)
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** res = (unsigned char)s1[i] - (unsigned char)s2[i];
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** return (res);
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** }
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**
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** size_t ft_strlen(const char *str)
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** {
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** size_t i;
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**
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** i = 0;
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** while (str[i])
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** i++;
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** return (i);
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** }
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**
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** int main(int ac, char **av)
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** {
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** char *str;
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** size_t size;
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** int start;
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**
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** str = "frgehr";
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** start = 2;
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** size = 5;
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** if (ac == 4)
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** {
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** str = strdup(av[1]);
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** start = atoi(av[2]);
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** size = atoi(av[3]);
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** }
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** char *ret = ft_substr(str, start, size);
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** printf("%s, %i, %zu\n", str, start, size);
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** printf("%s\n", ret);
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** free(ret);
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** return (0);
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** }
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*/
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#include "libft.h"
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char *ft_substr(char const *s, unsigned int start, size_t len)
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{
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char *str;
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size_t i;
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if (!s)
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return (NULL);
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if (ft_strlen(s) < start)
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return (ft_strdup(""));
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str = (char *)malloc(sizeof(char) * (len + 1));
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if (!str)
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return (NULL);
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i = 0;
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while (i < len && s[start])
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str[i++] = s[start++];
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str[i] = '\0';
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return (str);
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}
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