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cub3d/libft/gnl/get_next_line.c

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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* get_next_line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: madumerg <madumerg@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/11/24 11:51:12 by madumerg #+# #+# */
/* Updated: 2024/09/04 15:59:19 by madumerg ### ########.fr */
/* */
/* ************************************************************************** */
#include "../includes/libft.h"
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char *ft_strjoin_gnl(char *s1, char *s2)
{
size_t len;
size_t i;
size_t j;
char *str;
if (!s2)
return (NULL);
len = ft_strlen(s1) + ft_strlen(s2);
str = malloc(sizeof(char) * (len + 1));
if (!str)
return (NULL);
i = 0;
while (s1[i] != '\0')
{
str[i] = s1[i];
i++;
}
j = 0;
while (s2[j] != '\0')
str[i++] = s2[j++];
free(s1);
str[i] = '\0';
return (str);
}
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char ft_end_of_line(char *line, char *buffer)
{
int i;
int j;
i = 0;
j = 0;
while (line[i] && line[i] != '\n')
i++;
if (line[i] == '\n')
{
i++;
while (line[i])
{
buffer[j] = line[i];
i++;
j++;
}
buffer[j] = '\0';
line[i - j] = '\0';
return (1);
}
return (0);
}
char *ft_verif(char **buffer, char *line)
{
free(*buffer);
*buffer = NULL;
if (line[0] != '\0')
return (line);
free(line);
return (NULL);
}
char *get_next_line(int fd)
{
static char *buffer;
char *line;
int read_nb;
if (fd < 0 || fd > 1023 || BUFFER_SIZE <= 0)
return (NULL);
line = ft_calloc(1, 1);
if (!buffer)
buffer = ft_calloc(sizeof(char), (BUFFER_SIZE + 1));
while (buffer && line)
{
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line = ft_strjoin_gnl(line, buffer);
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if (!line)
return (NULL);
if (ft_end_of_line(line, buffer) == 1)
return (line);
read_nb = read(fd, buffer, BUFFER_SIZE);
if (read_nb < 1)
return (ft_verif(&buffer, line));
buffer[read_nb] = '\0';
}
return (NULL);
}