Remove side effects from BuiltinReadDirectory()

The first time BuiltinReadDirectory() is called,
save the content of builtin_dir and builtin_alias,
before calling FontFileAddFontFile(), because that fonction
will modify those.

Then, in subsequent calls to BuiltinReadDirectory(), restore
builtin_dir and builtin_alias so that the side effect incurred
by the first call disappears.

1 files changed, 155 insertions, 0 deletions

diff --git a/src/builtins/dir.c b/src/builtins/dir.c
index c272449..97f1e1e 100644
--- a/src/builtins/dir.c
+++ b/src/builtins/dir.c
@@ -29,6 +29,133 @@
 #endif
 #include "builtin.h"
 
+BuiltinDirPtr
+BuiltinDirsDup (const BuiltinDirPtr a_dirs,
+                int a_dirs_len)
+{
+    BuiltinDirPtr dirs=NULL ;
+    int i=0 ;
+
+    if (!a_dirs)
+        return NULL ;
+
+    dirs = xcalloc (a_dirs_len, sizeof (BuiltinDirRec)) ;
+    if (!dirs)
+        return NULL ;
+
+    for (i=0; i < a_dirs_len; i++) {
+        int len = strlen (a_dirs[i].file_name) ;
+        dirs[i].file_name = xcalloc (1, len) ;
+        memmove (dirs[i].file_name, a_dirs[i].file_name, len);
+        len = strlen (a_dirs[i].font_name) ;
+        dirs[i].font_name = xcalloc (1, len) ;
+        memmove (dirs[i].font_name, a_dirs[i].font_name, len);
+    }
+    return dirs ;
+}
+
+/**
+ * Copy a_save back into a_cur
+ * @param a_cur the instance of BuiltinDir to restore
+ * @param a_saved the saved instance of BuiltinDir to copy into a_cur
+ * @return 0 if went okay, 1 otherwise.
+ */
+int
+BuiltinDirRestore (BuiltinDirPtr a_cur,
+                   const BuiltinDirPtr a_saved)
+{
+    if (!a_cur)
+        return 1 ;
+    if (!a_saved)
+        return 0 ;
+
+    if (a_saved->font_name)
+        memmove (a_cur->font_name, a_saved->font_name, strlen (a_saved->font_name)) ;
+    return 0 ;
+}
+
+
+int
+BuiltinDirsRestore (BuiltinDirPtr a_cur_tab,
+                    const BuiltinDirPtr a_saved_tab,
+                    int a_tab_len)
+{
+    int i=0 ;
+
+    if (!a_cur_tab)
+        return 1 ;
+    if (!a_saved_tab)
+        return 0 ;
+
+    for (i=0 ; i < a_tab_len; i++) {
+        if (BuiltinDirRestore (&a_cur_tab[i], &a_saved_tab[i]))
+            return 1 ;
+    }
+    return 0 ;
+}
+
+BuiltinAliasPtr
+BuiltinAliasesDup (const BuiltinAliasPtr a_aliases,
+                   int a_aliases_len)
+{
+    BuiltinAliasPtr aliases=NULL ;
+    int i=0 ;
+
+    if (!a_aliases)
+        return NULL ;
+
+    aliases = xcalloc (a_aliases_len, sizeof (BuiltinAliasRec)) ;
+    if (!aliases)
+        return NULL ;
+
+    for (i=0; i < a_aliases_len; i++) {
+        int len = strlen (a_aliases[i].font_name) ;
+        aliases[i].font_name = xcalloc (1, len) ;
+        memmove (aliases[i].font_name, a_aliases[i].font_name, len);
+    }
+    return aliases ;
+}
+
+/**
+ * Copy a_save back into a_cur
+ * @param a_cur the instance of BuiltinAlias to restore
+ * @param a_saved the saved instance of BuiltinAlias to copy into a_cur
+ * @return 0 if went okay, 1 otherwise.
+ */
+int
+BuiltinAliasRestore (BuiltinAliasPtr a_cur,
+                     const BuiltinAliasPtr a_save)
+{
+    if (!a_cur)
+        return 1 ;
+    if (!a_save)
+        return 0 ;
+    if (a_save->alias_name)
+        memmove (a_cur->alias_name, a_save->alias_name, strlen (a_save->alias_name)) ;
+    if (a_save->font_name)
+        memmove (a_cur->font_name, a_save->font_name, strlen (a_save->font_name)) ;
+    return 0 ;
+}
+
+int
+BuiltinAliasesRestore (BuiltinAliasPtr a_cur_tab,
+                       const BuiltinAliasPtr a_saved_tab,
+                       int a_tab_len)
+{
+    int i=0 ;
+
+    if (!a_cur_tab)
+        return 1 ;
+    if (!a_saved_tab)
+        return 0 ;
+
+    for (i=0 ; i < a_tab_len; i++) {
+        if (BuiltinAliasRestore (&a_cur_tab[i], &a_saved_tab[i]))
+            return 1 ;
+    }
+    return 0 ;
+}
+
 int
 BuiltinReadDirectory (char *directory, FontDirectoryPtr *pdir)
 {
@@ -36,6 +163,34 @@ BuiltinReadDirectory (char *directory, FontDirectoryPtr *pdir)
     int			i;
 
     dir = FontFileMakeDir ("", builtin_dir_count);
+    static BuiltinDirPtr saved_builtin_dir ;
+    static BuiltinAliasPtr saved_builtin_alias ;
+
+
+    if (saved_builtin_dir)
+    {
+        BuiltinDirsRestore ((BuiltinDirPtr) builtin_dir,
+                            saved_builtin_dir,
+                            builtin_dir_count) ;
+    }
+    else
+    {
+        saved_builtin_dir = BuiltinDirsDup ((const BuiltinDirPtr) builtin_dir,
+                                            builtin_dir_count) ;
+    }
+
+    if (saved_builtin_alias)
+    {
+        BuiltinAliasesRestore ((BuiltinAliasPtr) builtin_alias,
+                               saved_builtin_alias,
+                               builtin_alias_count) ;
+    }
+    else
+    {
+        saved_builtin_alias = BuiltinAliasesDup ((const BuiltinAliasPtr) builtin_alias,
+                                                 builtin_alias_count) ;
+    }
+
     for (i = 0; i < builtin_dir_count; i++)
     {
 	if (!FontFileAddFontFile (dir,