autoresume: Match full directory path names only in autoresumable()

Removed genre-tag matching (considered too fragile for real-world use).

Removed substring matching for file names.  To avoid unintended
matches, the search pattern now must match the file's full dir name
(or a parent directory thereof), anchored in the root directory.

Search strings now must be delimited with ":" rather than ",".  The
default list of directories is "/podcast:/podcasts" (case-insensitive).

Made implementation somewhat more efficient (don't use strtok -> no
need to copy the string to private storage (stack) before tokenizing
it).

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29280 a1c6a512-1295-4272-9138-f99709370657

apps/menus/settings_menu.c

@@ -403,7 +403,7 @@ static int autoresume_nexttrack_callback(int action,
             break;
         case ACTION_EXIT_MENUITEM:
             if (global_settings.autoresume_automatic == AUTORESUME_NEXTTRACK_CUSTOM
-                && kbd_input ((char*) &global_settings.autoresume_strpat,
+                && kbd_input ((char*) &global_settings.autoresume_paths,
                               MAX_PATHNAME+1) < 0)
             {
                 global_settings.autoresume_automatic = oldval;

apps/metadata.c

@@ -435,38 +435,54 @@ enum { AUTORESUMABLE_UNKNOWN = 0, AUTORESUMABLE_TRUE, AUTORESUMABLE_FALSE };
 
 bool autoresumable(struct mp3entry *id3)
 {
-    unsigned char search[MAX_PATHNAME+1];
-    char *saveptr, *substr;
+    char *endp, *path;
+    size_t len;
     bool is_resumable;
 
     if (id3->autoresumable)             /* result cached? */
         return id3->autoresumable == AUTORESUMABLE_TRUE;
 
-    is_resumable = true;
-
-    strcpy(search, global_settings.autoresume_strpat);
-    
-    for (substr = strtok_r(search, ",", &saveptr);
-         substr;
-         substr = strtok_r(NULL, ",", &saveptr))
-    {
-        if (id3->path && strcasestr(id3->path, substr))
-            goto out;
-        if (id3->genre_string && strcasestr(id3->genre_string, substr))
-            goto out;
-    }
-    
     is_resumable = false;
 
-  out:
+    if (id3->path)
+    {
+        for (path = global_settings.autoresume_paths;
+             *path;                     /* search terms left? */
+             path++)
+        {
+            if (*path == ':')           /* Skip empty search patterns */
+                continue;
+
+            /* FIXME: As soon as strcspn or strchrnul are made available in
+               the core, the following can be made more efficient. */
+            endp = strchr(path, ':');
+            if (endp)
+                len = endp - path;
+            else
+                len = strlen(path);
+
+            /* Note: At this point, len is always > 0 */
+
+            if (strncasecmp(id3->path, path, len) == 0)
+            {
+                /* Full directory-name matches only.  Trailing '/' in
+                   search path OK. */
+                if (id3->path[len] == '/' || id3->path[len - 1] == '/')
+                {
+                    is_resumable = true;
+                    break;
+                }
+            }
+            path += len - 1;
+        }
+    }
+
     /* cache result */
     id3->autoresumable =
         is_resumable ? AUTORESUMABLE_TRUE : AUTORESUMABLE_FALSE;
 
-    logf("autoresumable: %s with genre %s is%s resumable",
-         id3->path,
-         id3->genre_string ? id3->genre_string : "(NULL)",
-         is_resumable ? "" : " not");
+    logf("autoresumable: %s is%s resumable",
+         id3->path, is_resumable ? "" : " not");
 
     return is_resumable;
 }

apps/settings.h

@@ -583,7 +583,7 @@ struct user_settings
     bool autoresume_enable;   /* enable auto-resume feature? */
     int autoresume_automatic; /* resume next track? 0=never, 1=always,
                                  2=custom */
-    unsigned char autoresume_strpat[MAX_PATHNAME+1]; /* comma-separated list */
+    unsigned char autoresume_paths[MAX_PATHNAME+1]; /* colon-separated list */
     bool runtimedb;           /* runtime database active? */
 #endif /* HAVE_TAGCACHE */
 

apps/settings_list.c

@@ -1268,8 +1268,8 @@ const struct settings_list settings[] = {
                    ID2P(LANG_SET_BOOL_NO),
                    ID2P(LANG_ALWAYS),
                    ID2P(LANG_AUTORESUME_CUSTOM)),
-    TEXT_SETTING(0, autoresume_strpat, "autoresume next track patterns",
-                 "podcast", NULL, NULL),
+    TEXT_SETTING(0, autoresume_paths, "autoresume next track paths",
+                 "/podcast:/podcasts", NULL, NULL),
 #endif                  
 
     OFFON_SETTING(0, runtimedb, LANG_RUNTIMEDB_ACTIVE, false,