124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* gnl.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: nalebrun <nalebrun@student.s19.be> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2024/11/27 11:45:42 by nalebrun #+# #+# */
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/* Updated: 2024/11/27 12:50:04 by nalebrun ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "../../libft.h"
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#include "gnl.h"
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void free_buf(char **tab)
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{
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if (tab && *tab)
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{
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free(*tab);
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*tab = NULL;
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}
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}
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char *build_tab(char *tab, char *buffer, int i)
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{
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char *ret;
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size_t t_len;
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size_t b_len;
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b_len = ft_gstrlen(buffer, -2);
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t_len = ft_gstrlen(tab, i);
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ret = malloc(b_len + t_len + 1);
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if (!ret)
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{
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free(tab);
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return (NULL);
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}
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if (tab)
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{
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ft_strlcpy(ret, tab, t_len + 1);
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ft_strlcat(&ret[t_len], buffer, b_len + t_len + 1);
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free(tab);
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}
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else
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ft_strlcpy(ret, buffer, b_len + 1);
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return (ret);
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}
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char *get_the_line(char **tab, int i)
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{
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char *line;
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char *new_tab;
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size_t len;
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char *nl_pos;
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nl_pos = ft_strichr(*tab, '\n', i);
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if (!nl_pos)
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return (NULL);
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len = nl_pos - *tab + 1;
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line = malloc(len + 1);
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if (!line)
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return (NULL);
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ft_strlcpy(line, *tab, len + 1);
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line[len] = '\0';
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new_tab = ft_strdup(*tab + len);
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if (!new_tab)
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{
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free(line);
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return (NULL);
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}
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free(*tab);
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*tab = new_tab;
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return (line);
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}
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int read_file(int fd, char **tab, int i)
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{
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char buffer[BUFFER_SIZE + 1];
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ssize_t bytes_read;
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bytes_read = read(fd, buffer, BUFFER_SIZE);
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if (bytes_read <= 0)
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{
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if (bytes_read == -1)
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free_buf(&tab[fd]);
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return (bytes_read);
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}
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buffer[bytes_read] = '\0';
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tab[fd] = build_tab(tab[fd], buffer, i);
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if (!tab[fd])
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return (-1);
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return (bytes_read);
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}
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char *get_next_line(int fd)
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{
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static char *tab[256];
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char *next_line;
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int i;
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i = -1;
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next_line = NULL;
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if (fd < 0 || fd >= 256 || BUFFER_SIZE == 0)
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return (NULL);
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while (++i || 1)
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{
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next_line = get_the_line(&tab[fd], i);
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if (next_line)
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return (next_line);
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if (read_file(fd, tab, i) <= 0)
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break ;
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}
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if (tab[fd] && *tab[fd])
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{
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next_line = tab[fd];
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tab[fd] = NULL;
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return (next_line);
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}
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free(tab[fd]);
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tab[fd] = NULL;
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return (NULL);
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}
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