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diff --git a/lib/sh/mailstat.c b/lib/sh/mailstat.c
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+/* mailstat.c -- stat a mailbox file, handling maildir-type mail directories */
+
+/* Copyright (C) 2001 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <bashtypes.h>
+#include <posixstat.h>
+#include <posixdir.h>
+#include <bashansi.h>
+
+#if defined (HAVE_SYS_PARAM_H)
+# include <sys/param.h>
+#endif
+
+#include <maxpath.h>
+
+/*
+ * Stat a file. If it's a maildir, check all messages
+ * in the maildir and present the grand total as a file.
+ * The fields in the 'struct stat' are from the mail directory.
+ * The following fields are emulated:
+ *
+ * st_nlink always 1, unless st_blocks is not present, in which case it's
+ * the total number of messages
+ * st_size total number of bytes in all files
+ * st_blocks total number of messages, if present in struct stat
+ * st_atime access time of newest file in maildir
+ * st_mtime modify time of newest file in maildir
+ * st_mode S_IFDIR changed to S_IFREG
+ *
+ * This is good enough for most mail-checking applications.
+ */
+
+int
+mailstat(path, st)
+ const char *path;
+ struct stat *st;
+{
+ static struct stat st_new_last, st_ret_last;
+ struct stat st_ret, st_tmp;
+ DIR *dd;
+ struct dirent *fn;
+ char dir[PATH_MAX * 2], file[PATH_MAX * 2 + 1];
+ int i, l;
+ time_t atime, mtime;
+
+ atime = mtime = 0;
+
+ /* First see if it's a directory. */
+ if ((i = stat(path, st)) != 0 || S_ISDIR(st->st_mode) == 0)
+ return i;
+
+ if (strlen(path) > sizeof(dir) - 5)
+ {
+#ifdef ENAMETOOLONG
+ errno = ENAMETOOLONG;
+#else
+ errno = EINVAL;
+#endif
+ return -1;
+ }
+
+ st_ret = *st;
+ st_ret.st_nlink = 1;
+ st_ret.st_size = 0;
+#ifdef HAVE_STRUCT_STAT_ST_BLOCKS
+ st_ret.st_blocks = 0;
+#else
+ st_ret.st_nlink = 0;
+#endif
+ st_ret.st_mode &= ~S_IFDIR;
+ st_ret.st_mode |= S_IFREG;
+
+ /* See if cur/ is present */
+ sprintf(dir, "%s/cur", path);
+ if (stat(dir, &st_tmp) || S_ISDIR(st_tmp.st_mode) == 0)
+ return 0;
+ st_ret.st_atime = st_tmp.st_atime;
+
+ /* See if tmp/ is present */
+ sprintf(dir, "%s/tmp", path);
+ if (stat(dir, &st_tmp) || S_ISDIR(st_tmp.st_mode) == 0)
+ return 0;
+ st_ret.st_mtime = st_tmp.st_mtime;
+
+ /* And new/ */
+ sprintf(dir, "%s/new", path);
+ if (stat(dir, &st_tmp) || S_ISDIR(st_tmp.st_mode) == 0)
+ return 0;
+ st_ret.st_mtime = st_tmp.st_mtime;
+
+ /* Optimization - if new/ didn't change, nothing else did. */
+ if (st_tmp.st_dev == st_new_last.st_dev &&
+ st_tmp.st_ino == st_new_last.st_ino &&
+ st_tmp.st_atime == st_new_last.st_atime &&
+ st_tmp.st_mtime == st_new_last.st_mtime)
+ {
+ *st = st_ret_last;
+ return 0;
+ }
+ st_new_last = st_tmp;
+
+ /* Loop over new/ and cur/ */
+ for (i = 0; i < 2; i++)
+ {
+ sprintf(dir, "%s/%s", path, i ? "cur" : "new");
+ sprintf(file, "%s/", dir);
+ l = strlen(file);
+ if ((dd = opendir(dir)) == NULL)
+ return 0;
+ while ((fn = readdir(dd)) != NULL)
+ {
+ if (fn->d_name[0] == '.' || strlen(fn->d_name) + l >= sizeof(file))
+ continue;
+ strcpy(file + l, fn->d_name);
+ if (stat(file, &st_tmp) != 0)
+ continue;
+ st_ret.st_size += st_tmp.st_size;
+#ifdef HAVE_STRUCT_STAT_ST_BLOCKS
+ st_ret.st_blocks++;
+#else
+ st_ret.st_nlink++;
+#endif
+ if (st_tmp.st_atime != st_tmp.st_mtime && st_tmp.st_atime > atime)
+ atime = st_tmp.st_atime;
+ if (st_tmp.st_mtime > mtime)
+ mtime = st_tmp.st_mtime;
+ }
+ closedir(dd);
+ }
+
+/* if (atime) */ /* Set atime even if cur/ is empty */
+ st_ret.st_atime = atime;
+ if (mtime)
+ st_ret.st_mtime = mtime;
+
+ *st = st_ret_last = st_ret;
+ return 0;
+}