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get_next_line_bonus.c
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get_next_line_bonus.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line_bonus.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: tchow-so <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/11/27 09:23:49 by tchow-so #+# #+# */
/* Updated: 2024/01/03 11:26:11 by tchow-so ### ########.fr */
/* */
/* ************************************************************************** */
/* The bonus part of this project is about programming a function that returns
a line read from a file descriptor, being able to handle multiple
file descriptors at the same time. */
//#include <fcntl.h>
#include "get_next_line_bonus.h"
char *read_from_fd(char *str, int fd);
char *ft_get_line(char *str);
char *clear_line(char *str);
char *get_next_line(int fd)
{
static char *str[FOPEN_MAX];
char *line;
if (fd < 0 || fd > FOPEN_MAX || BUFFER_SIZE <= 0)
return (NULL);
if (!str[fd])
{
str[fd] = malloc(1);
str[fd][0] = '\0';
}
str[fd] = read_from_fd(str[fd], fd);
if (!str[fd])
return (NULL);
line = ft_get_line(str[fd]);
str[fd] = clear_line(str[fd]);
return (line);
}
/* read BUFFER_SIZE bytes from file (identified by fd) */
char *read_from_fd(char *str, int fd)
{
int bytes_read;
char *buffer;
buffer = malloc(sizeof(char) * (BUFFER_SIZE + 1));
if (!buffer)
return (NULL);
bytes_read = 1;
while (!ft_strchr_gnl(str, '\n') && bytes_read != 0)
{
bytes_read = read(fd, buffer, BUFFER_SIZE);
if (bytes_read == -1)
{
free(str);
free(buffer);
return (NULL);
}
buffer[bytes_read] = '\0';
str = ft_strjoin_gnl(str, buffer);
}
free(buffer);
return (str);
}
/* get line from 'str' and terminate it */
char *ft_get_line(char *str)
{
int i;
char *line;
i = 0;
if (str[i] == '\0')
return (NULL);
while (str[i] && str[i] != '\n')
i++;
if (str[i] == '\0')
line = malloc(i + 1);
else
line = malloc(i + 2);
if (!line)
return (NULL);
i = 0;
while (str[i] && str[i] != '\n')
{
line[i] = str[i];
i++;
}
if (str[i] == '\n')
line[i++] = '\n';
line[i] = '\0';
return (line);
}
/* clear previous line from 'str' */
char *clear_line(char *str)
{
int i;
int j;
char *tmp;
i = 0;
while (str[i] && (str[i] != '\n'))
i++;
if (!str[i])
{
free(str);
return (NULL);
}
tmp = malloc(sizeof(char) * (ft_strlen_gnl(str) - i + 1));
if (!tmp)
{
free(tmp);
return (NULL);
}
i++;
j = 0;
while (str[i])
tmp[j++] = str[i++];
tmp[j] = '\0';
free(str);
return (tmp);
}
// PROGRAM MAIN FUNCTION (testing)
/*int main(void)
{
int fd0;
int fd1;
int fd2;
char *str;
fd0 = open("file.txt", O_RDONLY);
fd1 = open("file1.txt", O_RDONLY);
fd2 = open("file2.txt", O_RDONLY);
str = get_next_line(fd0);
printf("%s", str);
free(str);
str = get_next_line(fd1);
printf("%s", str);
free(str);
str = get_next_line(fd2);
printf("%s", str);
free(str);
str = get_next_line(fd0);
printf("%s", str);
free(str);
close(fd0);
close(fd1);
close(fd2);
return (0);
}*/
// FOPEN_MAX
/* This macro constant expands to an integral expression that represents the
maximum number of files that can be opened simultaneously. */