/* savedir.c -- save the list of files in a directory in a string
- Copyright (C) 1990 Free Software Foundation, Inc.
+ Copyright (C) 1990, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
-#ifdef HAVE_CONFIG_H
-#if defined (CONFIG_BROKETS)
-/* We use <config.h> instead of "config.h" so that a compilation
- using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
- (which it would do because it found this file in $srcdir). */
-#include <config.h>
-#else
-#include "config.h"
-#endif
+#if HAVE_CONFIG_H
+# include <config.h>
#endif
#include <sys/types.h>
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#if HAVE_DIRENT_H
+# include <dirent.h>
+#else
+# define dirent direct
+# if HAVE_SYS_NDIR_H
+# include <sys/ndir.h>
+# endif
+# if HAVE_SYS_DIR_H
+# include <sys/dir.h>
+# endif
+# if HAVE_NDIR_H
+# include <ndir.h>
+# endif
#endif
-#ifdef DIRENT
-#include <dirent.h>
-#define NLENGTH(direct) (strlen((direct)->d_name))
-#else /* not DIRENT */
-#define dirent direct
-#define NLENGTH(direct) ((direct)->d_namlen)
-#ifdef SYSNDIR
-#include <sys/ndir.h>
-#endif /* SYSNDIR */
-#ifdef SYSDIR
-#include <sys/dir.h>
-#endif /* SYSDIR */
-#ifdef NDIR
-#include <ndir.h>
-#endif /* NDIR */
-#endif /* DIRENT */
-
-#ifdef VOID_CLOSEDIR
+#ifdef CLOSEDIR_VOID
/* Fake a return value. */
-#define CLOSEDIR(d) (closedir (d), 0)
+# define CLOSEDIR(d) (closedir (d), 0)
#else
-#define CLOSEDIR(d) closedir (d)
+# define CLOSEDIR(d) closedir (d)
#endif
#ifdef STDC_HEADERS
-#include <stdlib.h>
-#include <string.h>
-#else
-char *malloc ();
-char *realloc ();
-#ifndef NULL
-#define NULL 0
+# include <stdlib.h>
+# include <string.h>
#endif
+#ifndef NULL
+# define NULL 0
#endif
-char *stpcpy ();
+#include "savedir.h"
+#include "xalloc.h"
/* Return a freshly allocated string containing the filenames
in directory DIR, separated by '\0' characters;
the end is marked by two '\0' characters in a row.
NAME_SIZE is the number of bytes to initially allocate
for the string; it will be enlarged as needed.
- Return NULL if DIR cannot be opened or if out of memory. */
+ Use NAME_SIZE == -1 if you do not know the size.
+ Return NULL (setting errno) if DIR cannot be opened, read, or closed. */
+
+#ifndef NAME_SIZE_DEFAULT
+# define NAME_SIZE_DEFAULT 512
+#endif
char *
-savedir (dir, name_size)
- char *dir;
- unsigned name_size;
+savedir (const char *dir, off_t name_size)
{
DIR *dirp;
struct dirent *dp;
char *name_space;
- char *namep;
+ size_t allocated = name_size; /* Overflow is checked indirectly below. */
+ size_t used = 0;
+ int save_errno;
dirp = opendir (dir);
if (dirp == NULL)
return NULL;
- name_space = (char *) malloc (name_size);
- if (name_space == NULL)
- {
- closedir (dirp);
- return NULL;
- }
- namep = name_space;
+ /* Use the default if the size is not known. Be sure "allocated"
+ is at least `1' so there's room for the final NUL byte.
+ Do not simply test name_size <= 0, because the initialization
+ of "allocated" might have overflowed. */
+ if (name_size < 0 || allocated == 0)
+ allocated = NAME_SIZE_DEFAULT;
+
+ name_space = xmalloc (allocated);
+ errno = 0;
while ((dp = readdir (dirp)) != NULL)
{
- /* Skip "." and ".." (some NFS filesystems' directories lack them). */
- if (dp->d_name[0] != '.'
- || (dp->d_name[1] != '\0'
- && (dp->d_name[1] != '.' || dp->d_name[2] != '\0')))
+ /* Skip "", ".", and "..". "" is returned by at least one buggy
+ implementation: Solaris 2.4 readdir on NFS filesystems. */
+ char const *entry = dp->d_name;
+ if (entry[entry[0] != '.' ? 0 : entry[1] != '.' ? 1 : 2] != '\0')
{
- unsigned size_needed = (namep - name_space) + NLENGTH (dp) + 2;
-
- if (size_needed > name_size)
+ size_t entry_size = strlen (entry) + 1;
+ if (used + entry_size < used)
+ xalloc_die ();
+ if (allocated <= used + entry_size)
{
- char *new_name_space;
-
- while (size_needed > name_size)
- name_size += 1024;
-
- new_name_space = realloc (name_space, name_size);
- if (new_name_space == NULL)
+ do
{
- closedir (dirp);
- return NULL;
+ if (2 * allocated < allocated)
+ xalloc_die ();
+ allocated *= 2;
}
- namep += new_name_space - name_space;
- name_space = new_name_space;
+ while (allocated <= used + entry_size);
+
+ name_space = xrealloc (name_space, allocated);
}
- namep = stpcpy (namep, dp->d_name) + 1;
+ memcpy (name_space + used, entry, entry_size);
+ used += entry_size;
}
}
- *namep = '\0';
- if (CLOSEDIR (dirp))
+ name_space[used] = '\0';
+ save_errno = errno;
+ if (CLOSEDIR (dirp) != 0)
+ save_errno = errno;
+ if (save_errno != 0)
{
free (name_space);
+ errno = save_errno;
return NULL;
}
return name_space;