From 892e407c5f5e06fa8c0ca9250b3bc99851c6a61d Mon Sep 17 00:00:00 2001
From: Tomas Bzatek <tbzatek@tbzatek.englab.brq.redhat.com>
Date: Fri, 13 Jun 2008 14:17:54 +0200
Subject: Symlink resolving code, disabled by default

---
 common/strutils.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)

(limited to 'common/strutils.c')

diff --git a/common/strutils.c b/common/strutils.c
index 3f390d9..5d9fa65 100644
--- a/common/strutils.c
+++ b/common/strutils.c
@@ -19,6 +19,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <glib.h>
 #include "strutils.h"
 
 
@@ -89,3 +90,105 @@ char* extract_file_path(const char *APath)
   snprintf(ANewPath, file_part - APath + 2, "%s", APath);
   return ANewPath;
 }
+
+
+
+
+
+
+
+
+//  canonicalize_filename() is stolen from glib-2.16
+//  Copyright (C) 2006-2007 Alexander Larsson <alexl@redhat.com>
+static char *
+canonicalize_filename (const char *filename)
+{
+  char *canon, *start, *p, *q;
+  int i;
+  
+  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;
+}
+
+
+char* resolve_relative(const char *source, const char *point_to)
+{
+  if (source == NULL) return NULL;
+  if (point_to == NULL) return strdup(source);
+  if (g_path_is_absolute(point_to)) return strdup(point_to);
+  
+  char *rel = g_build_filename(source, point_to, NULL);
+  log("resolve_relative: rel = '%s'\n", rel);
+  char *canon = canonicalize_filename(rel);
+  log("resolve_relative: canon = '%s'\n", canon);
+  free(rel);
+	
+  return canon;	
+}
-- 
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