128 lines
3.7 KiB
C
128 lines
3.7 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: maix <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2023/11/23 17:38:21 by maix #+# #+# */
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/* Updated: 2024/08/22 16:29:28 by maiboyer ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "me/string/string.h"
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#include "me/gnl/gnl.h"
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#include "me/mem/mem.h"
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#include "me/mem/mem.h"
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#include "me/str/str.h"
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#include "me/types.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static t_static_buffer *get_next_line_buffer(int fd)
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{
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t_usize index;
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static t_static_buffer bufs[BUFFER_LENGTH] = {0};
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index = 0;
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while (index < BUFFER_LENGTH && (bufs[index].fd != fd && bufs[index].used))
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index++;
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if (index == BUFFER_LENGTH)
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return (NULL);
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bufs[index].fd = fd;
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bufs[index].used = true;
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return (&bufs[index]);
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}
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static bool copy_next_line_into_buffer(int fd, t_string *out,
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char *temp_buffer, t_usize amount)
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{
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char *buf;
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char *newline;
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bool got_newline;
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t_usize other_part_len;
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buf = get_next_line_buffer(fd)->buf;
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newline = buf;
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while (*newline != '\n' && *newline && newline < buf + amount)
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newline++;
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got_newline = *newline == '\n';
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other_part_len = amount - (t_usize)(newline - buf + !got_newline);
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if (amount < (t_usize)(newline - buf + !got_newline))
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other_part_len = 0;
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mem_move(temp_buffer, buf, (t_usize)(newline - buf + got_newline));
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buf[(t_usize)(newline - buf)] = 0;
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temp_buffer[(t_usize)(newline - buf + got_newline)] = 0;
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mem_move(buf, newline + 1, other_part_len);
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string_push(out, temp_buffer);
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buf[amount - (t_usize)(newline - buf + got_newline)] = 0;
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return (got_newline);
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}
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static bool read_and_copy(int fd, t_string *out, char *tmp,
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t_copy_flags *flags)
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{
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t_isize amount;
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t_static_buffer *buf;
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buf = get_next_line_buffer(fd);
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amount = read(fd, &buf->buf, BUFFER_SIZE);
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flags->error = amount < 0;
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if (flags->error)
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return (true);
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buf->init = true;
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if ((t_isize)amount < (t_isize)BUFFER_SIZE)
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{
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copy_next_line_into_buffer(fd, out, tmp, (t_usize)amount);
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flags->empty_read = (amount == 0 && out->len == 0);
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return (true);
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}
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buf->buf[(t_usize)amount] = 0;
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return (copy_next_line_into_buffer(fd, out, tmp, (t_usize)amount));
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}
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static bool handle_leftovers(int fd, char *temp_buffer, t_string *buf)
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{
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t_static_buffer *static_buffer;
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static_buffer = get_next_line_buffer(fd);
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if (static_buffer->init)
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{
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if (copy_next_line_into_buffer(fd, buf, temp_buffer,
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str_len(static_buffer->buf)))
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{
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mem_free(temp_buffer);
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return (true);
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}
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}
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return (false);
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}
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t_string get_next_line(int fd, bool *error)
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{
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t_string buf;
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char *temp_buffer;
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t_copy_flags flags;
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*error = false;
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if (fd < 0 || BUFFER_SIZE <= 0)
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return (*error = true, (t_string){0});
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flags = (t_copy_flags){
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.error = false,
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.empty_read = false,
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};
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temp_buffer = mem_alloc(sizeof(char) * (BUFFER_SIZE + 2));
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buf = string_new(32);
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if (handle_leftovers(fd, temp_buffer, &buf))
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return (buf);
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while (!read_and_copy(fd, &buf, temp_buffer, &flags) && !flags.empty_read)
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;
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mem_free(temp_buffer);
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if (flags.error || flags.empty_read)
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{
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mem_free(buf.buf);
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return (*error = true, (t_string){0});
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}
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return (buf);
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}
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