Expansion: post-rebasing

src/subst/wildcard_exp.c

@@ -5,30 +5,127 @@
 /*                                                    +:+ +:+         +:+     */
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
-/*   Created: 2025/03/06 13:02/36 by khais             #+#    #+#             */
-/*   Updated: 2025/03/06 13:02:36 by khais            ###   ########.fr       */
+/*   Created: 2025/02/23 15:02:59 by jguelen           #+#    #+#             */
+/*   Updated: 2025/03/06 17:40:42 by jguelen          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "ft_printf.h"
 #include "subst.h"
 #include "unistd.h"
+#include "minishell.h"
 
+/******************************************************************************/
+/* NOTE: Use of errno and the setting of it was OKed by Alexandru in this     */
+/* context.                                                                   */
+/******************************************************************************/
 /*
-** TODO 
+** Returns a directory stream corresponding to the current directory.
+**
 */
+DIR	*open_current_dir(void)
+{
+	char	*cur_dir_path;
+	size_t	size;
+	DIR		*dir;
+
+	size = PATH_SIZE_INIT;
+	cur_dir_path = malloc(size * sizeof(char));
+	if (!cur_dir_path)
+		return (NULL);
+	while (getcwd(cur_dir_path, size) == NULL)
+	{
+		if (errno != ERANGE)
+			return (NULL);
+		free(cur_dir_path);
+		size *= 2;
+		cur_dir_path = malloc(size * sizeof(char));
+		if (!cur_dir_path)
+			return (NULL);
+	}
+	errno = 0;
+	dir = opendir(cur_dir_path);
+	free(cur_dir_path);
+	return (dir);
+}
 
 /*
-** A function designed to present all possible * filename expansions for the
-** current directory.
+**
+*/
+static t_wordlist	*add_file_to_list(t_wordlist **list, char *filename)
+{
+	t_worddesc	*file_desc;
+	char		*copy;
+
+	copy = ft_strdup(filename);
+	if (!copy)
+		return (wordlist_destroy(*list), NULL);
+	file_desc = worddesc_create(copy, '\0');
+	if (!file_desc)
+	{
+		wordlist_destroy(*list);
+		return (NULL);
+	}
+	*list = wordlist_push(*list, file_desc);
+	return (*list);
+}
+
+/*
+** Returns true if and only if filename is recognized by pattern, false
+** otherwise.
+** Takes only into account the * wildcard or ?, those characters
+** NOTE: for a pattern to accept '.' as the first character of a filename
+** it must be explicitly matched (only for the first character though).
+** Similarly, '/' is never to be matched except if given explicitly.
+*/
+bool	fits_pattern(char *string, char *pattern)
+{
+}
+
+
+/*
+** TODO Check if return value correct regarding the manual specifacally the
+** following:
+** cf Bash scans each word for the character '*'.
+**
+** If one of these characters appears, and is not quoted, then the word is
+** regarded as a PATTERN, and replaced with an alphabetically sorted list
+** of filenames matching the pattern (see: Pattern Matching). If no matching
+** filenames are found, the word is left unchanged.
+*/
+/*
+** A function designed to present all possible * or ? filename expansions
+** for the current directory. (? is not asked by the subject).
 ** Does not take into account any other wildcard and does only search the
 ** current working directory.
 ** @PARAM A C compliant character string representing a pattern for a filename.
-** @RETURN A NULL-terminated pointer to a wordlist 
+** @RETURN
 */
 t_wordlist	*expand_star(char *file_pattern)
 {
-	(void)file_pattern;
-	ft_dprintf(STDERR_FILENO, "Not implemented: expand_star\n");
-	return (NULL);
+	struct dirent	*new;
+	DIR				*current_dir;
+	t_wordlist		*file_wordlist;
+
+	current_dir = open_current_dir();
+	if (current_dir == NULL)
+		return (NULL);
+	errno = 0;
+	file_wordlist = NULL;
+	new = readdir(current_dir);
+	while (new)
+	{
+		if (fits_pattern(new->d_name, file_pattern))
+		{
+			if (add_file_to_list(&file_wordlist, new->d_name) == NULL)
+				return (NULL);
+		}
+		errno = 0;
+		new = readdir(current_dir);
+	}
+	if (errno)
+		return (wordlist_destroy(file_wordlist), NULL);
+	if (!file_wordlist)
+		add_file_to list(&file_wordlist, file_pattern);
+	return (file_wordlist);
 }