136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/* ************************************************************************** */
|
|
/* */
|
|
/* ::: :::::::: */
|
|
/* get_next_line.c :+: :+: :+: */
|
|
/* +:+ +:+ +:+ */
|
|
/* By: kcolin <marvin@42.fr> +#+ +:+ +#+ */
|
|
/* +#+#+#+#+#+ +#+ */
|
|
/* Created: 2024/10/23 20:32:46 by kcolin #+# #+# */
|
|
/* Updated: 2024/11/01 13:17:01 by kcolin ### ########.fr */
|
|
/* */
|
|
/* ************************************************************************** */
|
|
|
|
#include "get_next_line.h"
|
|
#include <stdlib.h>
|
|
|
|
char *ft_strchr(const char *s, int c);
|
|
size_t ft_strlen(const char *s);
|
|
size_t ft_strlcpy(char *dst, const char *src, size_t size);
|
|
char *ft_strjoin_free_s1(char const *s1, char const *s2);
|
|
|
|
/*
|
|
static int num_allocs = 0;
|
|
|
|
static void *xmalloc(size_t size)
|
|
{
|
|
if (FAIL_AFTER > 0 && num_allocs++ >= FAIL_AFTER)
|
|
{
|
|
return 0;
|
|
}
|
|
return malloc(size);
|
|
}
|
|
|
|
#define malloc(x) xmalloc(x)
|
|
*/
|
|
|
|
char *shorten_buffer(char *buffer)
|
|
{
|
|
char *outbuf;
|
|
char *addr_of_newline;
|
|
size_t index_after_newline;
|
|
size_t outlen;
|
|
|
|
addr_of_newline = ft_strchr(buffer, '\n');
|
|
if (addr_of_newline == NULL)
|
|
{
|
|
buffer[0] = '\0';
|
|
return (buffer);
|
|
}
|
|
else
|
|
{
|
|
index_after_newline = addr_of_newline + 1 - buffer;
|
|
outlen = ft_strlen(buffer + index_after_newline) + 1;
|
|
outbuf = malloc(outlen * sizeof(char));
|
|
if (outbuf != NULL)
|
|
ft_strlcpy(outbuf, buffer + index_after_newline, outlen);
|
|
}
|
|
free(buffer);
|
|
return (outbuf);
|
|
}
|
|
|
|
/*
|
|
** returns 1 on error, 0 on success
|
|
*/
|
|
int setup_buffers(char **buffer, char **read_buffer)
|
|
{
|
|
if (*buffer == NULL)
|
|
{
|
|
*buffer = malloc(1 * sizeof(char));
|
|
if (*buffer == NULL)
|
|
return (1);
|
|
*buffer[0] = '\0';
|
|
}
|
|
*read_buffer = malloc((BUFFER_SIZE + 1) * sizeof(char));
|
|
if (*read_buffer == NULL)
|
|
{
|
|
free(*buffer);
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
char *prepare_output_buffer(char **buffer, char *read_buffer)
|
|
{
|
|
char *outbuf;
|
|
|
|
outbuf = malloc((ft_strchr(*buffer, '\n') - *buffer + 2));
|
|
if (outbuf == NULL)
|
|
{
|
|
free(read_buffer);
|
|
free(*buffer);
|
|
*buffer = NULL;
|
|
return (NULL);
|
|
}
|
|
ft_strlcpy(outbuf, *buffer, ft_strchr(*buffer, '\n') - *buffer + 2);
|
|
*buffer = shorten_buffer(*buffer);
|
|
free(read_buffer);
|
|
return (outbuf);
|
|
}
|
|
|
|
char *get_next_line(int fd)
|
|
{
|
|
static char *buffer = NULL;
|
|
char *read_buffer;
|
|
int num_bytes_read;
|
|
char *outbuf;
|
|
|
|
if (setup_buffers(&buffer, &read_buffer) != 0)
|
|
return (NULL);
|
|
num_bytes_read = 1;
|
|
while (num_bytes_read != 0)
|
|
{
|
|
if (ft_strchr(buffer, '\n'))
|
|
return (prepare_output_buffer(&buffer, read_buffer));
|
|
num_bytes_read = read(fd, read_buffer, BUFFER_SIZE);
|
|
if (num_bytes_read < 0)
|
|
{
|
|
free(read_buffer);
|
|
free(buffer);
|
|
buffer = NULL;
|
|
return (NULL);
|
|
}
|
|
read_buffer[num_bytes_read] = '\0';
|
|
buffer = ft_strjoin_free_s1(buffer, read_buffer);
|
|
if (buffer == NULL)
|
|
return (NULL);
|
|
}
|
|
free(read_buffer);
|
|
outbuf = buffer;
|
|
if (ft_strlen(buffer) == 0)
|
|
{
|
|
free(buffer);
|
|
outbuf = NULL;
|
|
}
|
|
buffer = NULL;
|
|
return (outbuf);
|
|
}
|