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132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/* savedir.c -- save the list of files in a directory in a string
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Copyright (C) 1990 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <sys/types.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_DIRENT_H
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# include <dirent.h>
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# define NAMLEN(dirent) strlen((dirent)->d_name)
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#else
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# define dirent direct
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# define NAMLEN(dirent) (dirent)->d_namlen
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# if HAVE_SYS_NDIR_H
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# include <sys/ndir.h>
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# endif
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# if HAVE_SYS_DIR_H
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# include <sys/dir.h>
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# endif
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# if HAVE_NDIR_H
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# include <ndir.h>
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# endif
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#endif
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#ifdef CLOSEDIR_VOID
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/* Fake a return value. */
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#define CLOSEDIR(d) (closedir (d), 0)
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#else
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#define CLOSEDIR(d) closedir (d)
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#endif
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#ifdef STDC_HEADERS
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#include <stdlib.h>
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#include <string.h>
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#else
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char *malloc ();
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char *realloc ();
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#endif
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#ifndef NULL
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#define NULL 0
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#endif
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char *stpcpy ();
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/* Return a freshly allocated string containing the filenames
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in directory DIR, separated by '\0' characters;
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the end is marked by two '\0' characters in a row.
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NAME_SIZE is the number of bytes to initially allocate
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for the string; it will be enlarged as needed.
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Return NULL if DIR cannot be opened or if out of memory. */
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char *
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savedir (dir, name_size)
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char *dir;
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unsigned name_size;
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{
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DIR *dirp;
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struct dirent *dp;
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char *name_space;
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char *namep;
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dirp = opendir (dir);
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if (dirp == NULL)
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return NULL;
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name_space = (char *) malloc (name_size);
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if (name_space == NULL)
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{
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closedir (dirp);
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return NULL;
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}
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namep = name_space;
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while ((dp = readdir (dirp)) != NULL)
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{
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/* Skip "." and ".." (some NFS filesystems' directories lack them). */
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if (dp->d_name[0] != '.'
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|| (dp->d_name[1] != '\0'
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&& (dp->d_name[1] != '.' || dp->d_name[2] != '\0')))
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{
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unsigned size_needed = (namep - name_space) + NAMLEN (dp) + 2;
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if (size_needed > name_size)
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{
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char *new_name_space;
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while (size_needed > name_size)
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name_size += 1024;
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new_name_space = realloc (name_space, name_size);
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if (new_name_space == NULL)
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{
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closedir (dirp);
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return NULL;
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}
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namep += new_name_space - name_space;
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name_space = new_name_space;
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}
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namep = stpcpy (namep, dp->d_name) + 1;
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}
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}
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*namep = '\0';
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if (CLOSEDIR (dirp))
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{
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free (name_space);
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return NULL;
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}
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return name_space;
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}
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