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124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
/* savedir.c -- save the list of files in a directory in a string
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Copyright 1990, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "savedir.h"
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#include <sys/types.h>
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#include <errno.h>
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#if HAVE_DIRENT_H
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# include <dirent.h>
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#else
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# define dirent direct
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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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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include "xalloc.h"
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/* Return a freshly allocated string containing the file names
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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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Return NULL (setting errno) if DIR cannot be opened, read, or closed. */
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#ifndef NAME_SIZE_DEFAULT
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# define NAME_SIZE_DEFAULT 512
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#endif
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char *
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savedir (const char *dir)
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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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size_t allocated = NAME_SIZE_DEFAULT;
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size_t used = 0;
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int save_errno;
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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 = xmalloc (allocated);
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errno = 0;
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while ((dp = readdir (dirp)) != NULL)
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{
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/* Skip "", ".", and "..". "" is returned by at least one buggy
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implementation: Solaris 2.4 readdir on NFS file systems. */
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char const *entry = dp->d_name;
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if (entry[entry[0] != '.' ? 0 : entry[1] != '.' ? 1 : 2] != '\0')
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{
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size_t entry_size = strlen (entry) + 1;
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if (used + entry_size < used)
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xalloc_die ();
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if (allocated <= used + entry_size)
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{
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do
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{
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if (2 * allocated < allocated)
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xalloc_die ();
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allocated *= 2;
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}
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while (allocated <= used + entry_size);
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name_space = xrealloc (name_space, allocated);
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}
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memcpy (name_space + used, entry, entry_size);
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used += entry_size;
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}
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}
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name_space[used] = '\0';
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save_errno = errno;
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if (CLOSEDIR (dirp) != 0)
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save_errno = errno;
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if (save_errno != 0)
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{
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free (name_space);
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errno = save_errno;
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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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