From 0d9e31c810a36cddadff7572fdbb5a1b505e495e Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@neko.keithp.com>
Date: Sun, 27 Aug 2006 23:40:51 -0700
Subject: [PATCH] Eliminate ./ and ../ elements from font directory names when
 scanning.

FcStrCanonFilename eliminates ./ and ../ elements from pathnames through
simple string editing. Also, relative path names are fixed by prepending the
current working directory.
---
 src/fcdir.c | 45 ++++++++++++++++++++++++++++--------------
 src/fcint.h |  3 +++
 src/fcstr.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 90 insertions(+), 15 deletions(-)

diff --git a/src/fcdir.c b/src/fcdir.c
index c15b727..86d391b 100644
--- a/src/fcdir.c
+++ b/src/fcdir.c
@@ -132,6 +132,7 @@ FcDirScanConfig (FcFontSet	*set,
 		 FcConfig	*config)
 {
     DIR			*d;
+    FcChar8		*canon_dir;
     struct dirent	*e;
     FcStrSet		*dirlist, *filelist;
     FcChar8		*file;
@@ -140,38 +141,49 @@ FcDirScanConfig (FcFontSet	*set,
     FcFontSet		*tmpSet;
     int			i;
 
-    if (config && !FcConfigAcceptFilename (config, dir))
-	return FcTrue;
+    canon_dir = FcStrCanonFilename (dir);
+    if (!canon_dir) canon_dir = (FcChar8 *) dir;
+    printf ("dir %s canon %s\n", dir, canon_dir);
+    
+    if (config && !FcConfigAcceptFilename (config, canon_dir)) {
+	ret = FcTrue;
+	goto bail;
+    }
 
     if (!force)
     {
-	if (FcDirCacheRead (set, dirs, dir, config))
-	    return FcTrue;
+	if (FcDirCacheRead (set, dirs, canon_dir, config)) {
+	    ret = FcTrue;
+	    goto bail;
+	}
     }
     
     if (FcDebug () & FC_DBG_FONTSET)
-    	printf ("cache scan dir %s\n", dir);
+    	printf ("cache scan dir %s\n", canon_dir);
 
     /* freed below */
-    file = (FcChar8 *) malloc (strlen ((char *) dir) + 1 + FC_MAX_FILE_LEN + 1);
-    if (!file)
-	return FcFalse;
+    file = (FcChar8 *) malloc (strlen ((char *) canon_dir) + 1 + FC_MAX_FILE_LEN + 1);
+    if (!file) {
+	ret = FcFalse;
+	goto bail;
+    }
 
-    strcpy ((char *) file, (char *) dir);
+    strcpy ((char *) file, (char *) canon_dir);
     strcat ((char *) file, "/");
     base = file + strlen ((char *) file);
     
     if (FcDebug () & FC_DBG_SCAN)
-	printf ("\tScanning dir %s\n", dir);
+	printf ("\tScanning dir %s\n", canon_dir);
 	
-    d = opendir ((char *) dir);
+    d = opendir ((char *) canon_dir);
     if (!d)
     {
-	free (file);
 	/* Don't complain about missing directories */
 	if (errno == ENOENT)
-	    return FcTrue;
-	return FcFalse;
+	    ret = FcTrue;
+	else
+	    ret = FcFalse;
+	goto bail_1;
     }
 
     tmpSet = FcFontSetCreate();
@@ -224,7 +236,7 @@ FcDirScanConfig (FcFontSet	*set,
      * Now that the directory has been scanned,
      * write out the cache file
      */
-    FcDirCacheWrite (tmpSet, dirlist, dir, config);
+    FcDirCacheWrite (tmpSet, dirlist, canon_dir, config);
 
     /*
      * Add the discovered fonts to our internal non-cache list
@@ -256,7 +268,10 @@ FcDirScanConfig (FcFontSet	*set,
  bail0:
     closedir (d);
     
+ bail_1:
     free (file);
+ bail:
+    if (canon_dir != dir) free (canon_dir);
     return ret;
 }
 
diff --git a/src/fcint.h b/src/fcint.h
index cb137d3..fbbdf77 100644
--- a/src/fcint.h
+++ b/src/fcint.h
@@ -926,4 +926,7 @@ FcStrLastSlash (const FcChar8  *path);
 FcChar32
 FcStrHashIgnoreCase (const FcChar8 *s);
 
+FcChar8 *
+FcStrCanonFilename (const FcChar8 *s);
+
 #endif /* _FC_INT_H_ */
diff --git a/src/fcstr.c b/src/fcstr.c
index 5d1961c..37bad6b 100644
--- a/src/fcstr.c
+++ b/src/fcstr.c
@@ -835,6 +835,63 @@ FcStrBasename (const FcChar8 *file)
     return FcStrCopy (slash + 1);
 }
 
+FcChar8 *
+FcStrCanonFilename (const FcChar8 *s)
+{
+    FcChar8 *file;
+    FcChar8 *f;
+    const FcChar8 *slash;
+    
+    if (*s != '/')
+    {
+	FcChar8	*full;
+	
+	FcChar8	cwd[FC_MAX_FILE_LEN + 2];
+	if (getcwd ((char *) cwd, FC_MAX_FILE_LEN) == NULL)
+	    return NULL;
+	strcat ((char *) cwd, "/");
+	full = FcStrPlus (cwd, s);
+	file = FcStrCanonFilename (full);
+	FcStrFree (full);
+	return file;
+    }
+    file = malloc (strlen ((char *) s) + 1);
+    if (!file)
+	return NULL;
+    slash = NULL;
+    f = file;
+    for (;;) {
+	if (*s == '/' || *s == '\0')
+	{
+	    if (slash)
+	    {
+		switch (s - slash) {
+		case 2:
+		    if (!strncmp ((char *) slash, "/.", 2))
+		    {
+			f -= 2;	/* trim /. from file */
+		    }
+		    break;
+		case 3:
+		    if (!strncmp ((char *) slash, "/..", 3))
+		    {
+			f -= 3;	/* trim /.. from file */
+			while (f > file) {
+			    if (*--f == '/')
+				break;
+			}
+		    }
+		    break;
+		}
+	    }
+	    slash = s;
+	}
+	if (!(*f++ = *s++))
+	    break;
+    }
+    return file;
+}
+
 FcStrSet *
 FcStrSetCreate (void)
 {
-- 
2.39.2