From 4c560fb4ab6c5d91a2797dfb772be0a6a1cf161c Mon Sep 17 00:00:00 2001
From: Søren Sandmann Pedersen <sandmann@daimi.au.dk>
Date: Tue, 14 Apr 2009 07:26:59 -0400
Subject: Add canonicalize_filename() from glib

---
 Makefile.am  |   1 +
 file-utils.c | 118 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 libnul.h     |   5 +++
 3 files changed, 124 insertions(+)
 create mode 100644 file-utils.c

diff --git a/Makefile.am b/Makefile.am
index 4273d74..530e464 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -9,6 +9,7 @@ libnul_la_SOURCES =	\
 	array.c		\
 	epoll.c		\
 	signal-handler.c \
+	file-utils.c	\
 	libnul.h
 
 clean-local:
diff --git a/file-utils.c b/file-utils.c
new file mode 100644
index 0000000..99806e4
--- /dev/null
+++ b/file-utils.c
@@ -0,0 +1,118 @@
+/* libnul
+ *
+ * Copyright (C) 2006-2007 Red Hat, Inc.
+ * Copyright (C) 2009 Soren Sandmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include <string.h>
+#include "libnul.h"
+
+/* nul_canonicalize_filename cutted and pasted from GIO
+ *
+ * Author: Alexander Larsson
+ */
+char *
+nul_canonicalize_filename (const char *filename)
+{
+    char *canon, *start, *p, *q;
+    char *cwd;
+    int i;
+
+    g_return_val_if_fail (filename != NULL, NULL);
+    
+    if (!g_path_is_absolute (filename))
+    {
+	cwd = g_get_current_dir ();
+	canon = g_build_filename (cwd, filename, NULL);
+	g_free (cwd);
+    }
+    else
+	canon = g_strdup (filename);
+    
+    start = (char *)g_path_skip_root (canon);
+    
+    /* POSIX allows double slashes at the start to
+     * mean something special (as does windows too).
+     * So, "//" != "/", but more than two slashes
+     * is treated as "/".
+     */
+    i = 0;
+    for (p = start - 1;
+	 (p >= canon) &&
+	     G_IS_DIR_SEPARATOR (*p);
+	 p--)
+	i++;
+    if (i > 2)
+    {
+	i -= 1;
+	start -= i;
+	memmove (start, start+i, strlen (start+i)+1);
+    }
+    
+    p = start;
+    while (*p != 0)
+    {
+	if (p[0] == '.' && (p[1] == 0 || G_IS_DIR_SEPARATOR (p[1])))
+        {
+	    memmove (p, p+1, strlen (p+1)+1);
+        }
+	else if (p[0] == '.' && p[1] == '.' &&
+		 (p[2] == 0 || G_IS_DIR_SEPARATOR (p[2])))
+        {
+	    q = p + 2;
+	    /* Skip previous separator */
+	    
+	    p = p - 2;
+	    if (p < start)
+		p = start;
+	    while (p > start && !G_IS_DIR_SEPARATOR (*p))
+		p--;
+	    if (G_IS_DIR_SEPARATOR (*p))
+		*p++ = G_DIR_SEPARATOR;
+	    memmove (p, q, strlen (q)+1);
+        }
+	else
+        {
+	    /* Skip until next separator */
+	    while (*p != 0 && !G_IS_DIR_SEPARATOR (*p))
+		p++;
+	    
+	    if (*p != 0)
+            {
+		/* Canonicalize one separator */
+		*p++ = G_DIR_SEPARATOR;
+            }
+        }
+	
+	/* Remove additional separators */
+	q = p;
+	while (*q && G_IS_DIR_SEPARATOR (*q))
+	    q++;
+	
+	if (p != q)
+	    memmove (p, q, strlen (q)+1);
+    }
+    
+    /* Remove trailing slashes */
+    if (p > start && G_IS_DIR_SEPARATOR (*(p-1)))
+	*(p-1) = 0;
+    
+    return canon;
+}
+
diff --git a/libnul.h b/libnul.h
index 9fa5764..b3e9955 100644
--- a/libnul.h
+++ b/libnul.h
@@ -244,6 +244,11 @@ void	 nul_fd_set_poll_handler      (int	     fd,
 void     nul_fd_remove_watch          (int           fd);
 gboolean nul_fd_is_watched            (int           fd);
 
+/*
+ * File utilities
+ */
+char *nul_canonicalize_filename (const char *filename);
+
 /*
  * Unix signal handlers
  */
-- 
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