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get_next_line/get_next_line.c
2023-12-06 11:45:25 +01:00

91 lines
2.2 KiB
C

/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: adjoly <adjoly@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/12/01 17:11:59 by adjoly #+# #+# */
/* Updated: 2023/12/06 11:18:18 by adjoly ### ########.fr */
/* */
/* ************************************************************************** */
#include "get_next_line.h"
int check_line(char *buf)
{
int i;
i = 0;
while (buf[i] && buf[i] != '\n')
i++;
if (buf[i] == '\n')
return (i + (buf[i] == '\n'));
return (0);
}
char *get_next_line(int fd)
{
static char *buf;
char *res;
char *tmp;
int size;
int bytes_read;
if (BUFFER_SIZE <= 0 || fd < 0)
return (NULL);
res = ft_calloc(1, 1);
if (!buf)
buf = ft_calloc(sizeof(char), BUFFER_SIZE + 1);
while (1)
{
tmp = ft_strjoin(res, buf);
if (!tmp)
return (NULL);
free(res);
res = tmp;
size = check_line(res);
bytes_read = read(fd, buf, BUFFER_SIZE);
buf[bytes_read] = 0;
if (bytes_read == 0 && ft_strlen(res) != 0)
{
free(buf);
buf = NULL;
return (res);
}
else if (bytes_read == 0)
return (NULL);
if (size != 0)
{
tmp = ft_strjoin(res, buf);
if (!tmp)
return (NULL);
free(res);
res = tmp;
ft_strlcpy(buf, &res[size], ft_strlen(&res[size]));
buf[ft_strlen(&res[size])] = 0;
res[size] = 0;
return (res);
}
}
}
#include <unistd.h>
void ft_putstr(char *str){if (str == NULL){return ;}int i = 0;while(str[i]){write(1, &str[i], 1);i++;}}
#include <fcntl.h>
#include <stdio.h>
int main(void)
{
char *ln;
int fd;
fd = open("test.txt", O_RDONLY);
while (1)
{
ln = get_next_line(fd);
if (ln == NULL)
return (0);
ft_putstr(ln);
free(ln);
}
}