Imported from ../bash-2.05a.tar.gz.

lib/sh/mailstat.c

@@ -0,0 +1,159 @@
+/* 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 2, 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; see the file COPYING.  If not, write to the Free Software
+   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+
+#include <config.h>
+ 
+#include <stdio.h>
+#include <errno.h>
+
+#include <bashtypes.h>
+#include <posixstat.h>
+#include <posixdir.h>
+#include <bashansi.h>
+
+#ifndef _MINIX
+#  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];
+  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)
+      st_ret.st_atime = atime;
+    if (mtime)
+      st_ret.st_mtime = mtime;
+
+    *st = st_ret_last = st_ret;
+    return 0;
+}