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https://github.com/troglobit/libite.git
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Joachim Wiberg
6537b11e34
Framework from libuEv. Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/* Functions for operating on files in directories.
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*
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* Copyright (c) 2008-2021 Joachim Wiberg <troglobit@gmail.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/**
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* @file dir.c
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* @author Joachim Wiberg
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* @date 2008-2021
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* @copyright ISC License
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*/
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#include <errno.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <string.h>
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static const char *matcher_type = NULL;
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static int (*matcher_filter) (const char *file) = NULL;
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static int matcher(const struct dirent *entry)
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{
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char *pos = strrchr(entry->d_name, '.');
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if (matcher_filter && !matcher_filter(entry->d_name))
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/* User matcher overrides the rest. */
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return 0;
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/* Skip current dir "." from list of files. */
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if ((1 == strlen(entry->d_name) && entry->d_name[0] == '.') ||
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(2 == strlen(entry->d_name) && !strcmp(entry->d_name, "..")))
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return 0;
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/* filetype == "" */
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if (matcher_type[0] == 0)
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return 1;
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/* Entry has no "." */
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if (!pos)
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return 0;
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return !strcmp(pos, matcher_type);
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}
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/**
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* List all files of a certain type in the given directory.
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* @param dir Base directory for dir operation.
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* @param type File type suffix, e.g. ".cfg".
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* @param filter Optional file name filter.
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* @param list Pointer to an array of file names.
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* @param strip Flag, if set dir() strips the file type.
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*
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* This function returns a @a list of files, matching the @a type
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* suffix, in the given directory @a dir.
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*
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* The @a list argument is a pointer to where to store the dynamically
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* allocated list of file names. This list should be free'd by first
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* calling free() on each file name and then on the list itself.
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*
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* If @a filter is not @c NULL it will be called for each file found.
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* If @a filter returns non-zero the @a file argument is included in the
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* resulting @a list. If @a filter returns zero for given @a file it is
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* discarded. If the @a strip flag is set the resulting @a list of
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* files has their file type stripped, including the dot. So a match
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* "config0.cfg" would be returned as "config0".
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*
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* @returns The number of files in @a list, zero if no matching files of
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* @a type, or non-zero on error with @a errno set.
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*/
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int dir(const char *dir, const char *type, int (*filter) (const char *file), char ***list, int strip)
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{
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int i, n, num = 0;
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char **files;
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struct dirent **namelist;
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if (!list) {
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errno = EINVAL;
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return -1;
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}
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if (!dir)
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/* Assuming current directory */
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dir = ".";
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if (!type)
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/* Assuming all files. */
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type = "";
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matcher_type = type;
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matcher_filter = filter;
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n = scandir(dir, &namelist, matcher, alphasort);
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if (n < 0)
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return -1;
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if (n > 0) {
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files = (char **)malloc(n * sizeof(char *));
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for (i = 0; i < n; i++) {
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if (files) {
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char *name = namelist[i]->d_name;
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char *type = strrchr(name, '.');
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if (type && strip)
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*type = 0;
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files[i] = strdup(name);
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num++;
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}
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free(namelist[i]);
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}
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if (num)
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*list = files;
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}
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if (namelist)
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free(namelist);
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return num;
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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