Move away from openvpn_basename() over to platform provided basename()

This kicks out the openvpn_basename() function from misc.[ch] and puts
glibc equivalents into compat.[ch].  This is to provide the same
functionality on platforms not having a native basename() function
available.

In addition this patch adds dirname() which commit 0f2bc0dd92f43c91e
depends.  Without dirname(), openvpn won't build in Visual Studio.

v2: Move all functions from compat.h to compat.c
v3: Use glibc versions of basename() and dirname() instead

Signed-off-by: David Sommerseth <davids@redhat.com>
Acked-by: Alon Bar-Lev <alon.barlev@gmail.com>
URL: http://thread.gmane.org/gmane.network.openvpn.devel/5178/focus=5215

1 files changed, 129 insertions, 0 deletions

diff --git a/compat.c b/compat.c
new file mode 100644
index 0000000..cb599b0
--- /dev/null
+++ b/compat.c
@@ -0,0 +1,129 @@
+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2011 - David Sommerseth <davids@redhat.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program 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 this program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "syshead.h"
+#include "compat.h"
+#include <string.h>
+
+
+#ifndef HAVE_DIRNAME
+/* Unoptimised version of glibc memrchr().
+ * This is considered fast enough, as only this compat
+ * version of dirname() depends on it.
+ */
+static const char *
+__memrchr(const char *str, int c, size_t n)
+{
+  const char *end = str;
+
+  end += n - 1; /* Go to the end of the string */
+  while (end >= str) {
+    if(c == *end)
+      return end;
+    else
+      end--;
+  }
+  return NULL;
+}
+
+/* Modified version based on glibc-2.14.1 by Ulrich Drepper <drepper@akkadia.org>
+ * This version is extended to handle both / and \ in path names.
+ */
+char *
+dirname (char *path)
+{
+  static const char dot[] = ".";
+  char *last_slash;
+  char separator = '/';
+
+  /* Find last '/'.  */
+  last_slash = path != NULL ? strrchr (path, '/') : NULL;
+  /* If NULL, check for \ instead ... might be Windows a path */
+  if (!last_slash) {
+    last_slash = path != NULL ? strrchr (path, '\\') : NULL;
+    separator = last_slash ? '\\' : '/';  /* Change the separator if \ was found */
+  }
+
+  if (last_slash != NULL && last_slash != path && last_slash[1] == '\0') {
+      /* Determine whether all remaining characters are slashes.  */
+      char *runp;
+
+      for (runp = last_slash; runp != path; --runp)
+	if (runp[-1] != separator)
+	  break;
+
+      /* The '/' is the last character, we have to look further.  */
+      if (runp != path)
+	last_slash = (char *) __memrchr (path, separator, runp - path);
+    }
+
+  if (last_slash != NULL) {
+      /* Determine whether all remaining characters are slashes.  */
+      char *runp;
+
+      for (runp = last_slash; runp != path; --runp)
+	if (runp[-1] != separator)
+	  break;
+
+      /* Terminate the path.  */
+      if (runp == path) {
+	  /* The last slash is the first character in the string.  We have to
+	     return "/".  As a special case we have to return "//" if there
+	     are exactly two slashes at the beginning of the string.  See
+	     XBD 4.10 Path Name Resolution for more information.  */
+	  if (last_slash == path + 1)
+	    ++last_slash;
+	  else
+	    last_slash = path + 1;
+	}
+      else
+	last_slash = runp;
+
+      last_slash[0] = '\0';
+  } else
+    /* This assignment is ill-designed but the XPG specs require to
+       return a string containing "." in any case no directory part is
+       found and so a static and constant string is required.  */
+    path = (char *) dot;
+
+  return path;
+}
+#endif /* HAVE_DIRNAME */
+
+
+#ifndef HAVE_BASENAME
+/* Modified version based on glibc-2.14.1 by Roland McGrath <roland@gnu.org>
+ * This version is extended to handle both / and \ in path names
+ */
+char *
+basename (const char *filename)
+{
+  char *p = strrchr (filenamem, '/');
+  if (!p) {
+    /* If NULL, check for \ instead ... might be Windows a path */
+    p = strrchr (filename, '\\');
+  }
+  return p ? p + 1 : (char *) filename;
+}
+#endif /* HAVE_BASENAME */