130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* get_next_line.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: kcolin <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2024/10/23 20:32:46 by kcolin #+# #+# */
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/* Updated: 2024/11/01 12:34:14 by kcolin ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "get_next_line.h"
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#include <stdlib.h>
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char *ft_strchr(const char *s, int c);
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size_t ft_strlen(const char *s);
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size_t ft_strlcpy(char *dst, const char *src, size_t size);
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char *ft_strjoin_free_s1(char const *s1, char const *s2);
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/*
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static int num_allocs = 0;
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static void *xmalloc(size_t size)
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{
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if (FAIL_AFTER > 0 && num_allocs++ >= FAIL_AFTER)
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{
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return 0;
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}
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return malloc(size);
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}
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#define malloc(x) xmalloc(x)
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*/
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char *shorten_buffer(char *buffer)
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{
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char *outbuf;
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char *addr_of_newline;
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size_t index_after_newline;
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size_t outlen;
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addr_of_newline = ft_strchr(buffer, '\n');
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if (addr_of_newline == NULL)
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{
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buffer[0] = '\0';
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return (buffer);
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}
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else
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{
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index_after_newline = addr_of_newline + 1 - buffer;
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outlen = ft_strlen(buffer + index_after_newline) + 1;
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outbuf = malloc(outlen * sizeof(char));
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if (outbuf != NULL)
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ft_strlcpy(outbuf, buffer + index_after_newline, outlen);
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}
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free(buffer);
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return (outbuf);
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}
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char *get_next_line(int fd)
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{
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static char *buffer = NULL;
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char *read_buffer;
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int num_bytes_read;
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char *outbuf;
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if (buffer == NULL)
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{
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buffer = malloc(1 * sizeof(char));
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if (buffer == NULL)
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return (NULL);
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buffer[0] = '\0';
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}
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read_buffer = malloc((BUFFER_SIZE + 1) * sizeof(char));
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if (read_buffer == NULL)
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{
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free(buffer);
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return (NULL);
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}
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num_bytes_read = 1;
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while (num_bytes_read != 0)
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{
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// DONE: if newline found,
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if (ft_strchr(buffer, '\n'))
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{
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// DONE: copy string until newline to new buffer,
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outbuf = malloc((ft_strchr(buffer, '\n') - buffer + 2));
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if (outbuf == NULL)
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{
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free(read_buffer);
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free(buffer);
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buffer = NULL;
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return (NULL);
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}
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ft_strlcpy(outbuf, buffer, ft_strchr(buffer, '\n') - buffer + 2);
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// DONE: shorten current buffer,
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// buffer += ft_strchr(buffer, '\n') - buffer + 1;
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buffer = shorten_buffer(buffer);
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// DONE: and return.
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free(read_buffer);
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return (outbuf);
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}
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num_bytes_read = read(fd, read_buffer, BUFFER_SIZE);
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if (num_bytes_read < 0)
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{
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free(read_buffer);
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free(buffer);
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buffer = NULL;
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return (NULL);
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}
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read_buffer[num_bytes_read] = '\0';
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// DONE: join with big buffer
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buffer = ft_strjoin_free_s1(buffer, read_buffer);
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if (buffer == NULL)
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{
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free(read_buffer);
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return (NULL);
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}
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}
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free(read_buffer);
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outbuf = buffer;
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if (ft_strlen(buffer) == 0)
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{
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free(buffer);
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outbuf = NULL;
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}
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buffer = NULL;
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return (outbuf);
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}
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