X-Git-Url: http://git.draconx.ca/gitweb/upkg.git/blobdiff_plain/aa3d8014ba02b49656689d1b4951ea79de76a414..b228d2b354248b62d70a582a37693cff829fe0c6:/src/uobject/vfs.c

diff --git a/src/uobject/vfs.c b/src/uobject/vfs.c
index fcbb3e5..8afb49b 100644
--- a/src/uobject/vfs.c
+++ b/src/uobject/vfs.c
@@ -35,12 +35,21 @@
 #	define IS_DIRSEP(x) ((x) == '/')
 #endif
 
+/* Number of times the library has been initialized. */
+static int initialized;
+
+/* Local package definitions. */
 struct local_pkg {
 	char *file, *name;
 };
-
 static struct avl_table *local_tree;
-static int initialized;
+
+/* Global package search path. */
+static char  *search_path;
+static size_t search_path_sz;
+
+/* Package file extensions, in decreasing order of precedence. */
+static const char u_pkg_exts[][5] = { ".u", ".utx", ".uax", ".umx", ".unr" };
 
 static int localcmp(const void *_a, const void *_b, void *_data)
 {
@@ -116,6 +125,56 @@ const char *u_pkg_vfs_add_local(const char *name, const char *file)
 	return spec->name;
 }
 
+/* Enlarge the search path buffer so that it can store at least need bytes. */
+static int expand_search_path(size_t need)
+{
+	size_t want = search_path_sz;
+	if (want == 0) want = 1;
+
+	while (want < need)
+		want *= 2;
+
+	if (want > search_path_sz) {
+		char *new = realloc(search_path, want);
+		if (!new) {
+			return -1;
+		}
+
+		search_path    = new;
+		search_path_sz = want;
+	}
+
+	return 0;
+}
+
+const char *u_pkg_vfs_get_search_path(void)
+{
+	return search_path ? search_path : "";
+}
+
+int u_pkg_vfs_set_search_path(const char *path)
+{
+	if (expand_search_path(strlen(path)+1) != 0)
+		return -1;
+	strcpy(search_path, path);
+	return 0;
+}
+
+int u_pkg_vfs_add_search_dir(const char *path)
+{
+	size_t end = search_path ? strlen(search_path) : 0;
+
+	if (end == 0) {
+		return u_pkg_vfs_set_search_path(path);
+	}
+
+	if (expand_search_path(end + strlen(path) + 2) != 0)
+		return -1;
+	search_path[end] = LT_PATHSEP_CHAR;
+	strcpy(search_path+end+1, path);
+	return 0;
+}
+
 void u_pkg_vfs_del_local(const char *name)
 {
 	struct local_pkg spec = { .name = (char *)name }, *item;
@@ -124,9 +183,52 @@ void u_pkg_vfs_del_local(const char *name)
 	free(item);
 }
 
+struct foreach_state {
+	const char *name;
+	struct upkg *f;
+	size_t sz;
+	char buf[];
+};
+
+static int foreachfile(const char *filename, void *_st)
+{
+	struct foreach_state **st = _st, *tmp;
+	size_t need, len;
+	const char *base;
+
+	/* Check if the filename matches the package name. */
+	base = pkgname_base(filename);
+	if (!base || strcasecmp(base, (*st)->name) != 0)
+		return 0;
+
+	/* Enlarge the state buffer, if necessary. */
+	need = strlen(filename) + sizeof **u_pkg_exts;
+	if ((*st)->sz < need) {
+		tmp = realloc(*st, sizeof **st + need);
+		if (!tmp)
+			return -1;
+		*st = tmp;
+		(*st)->sz = need;
+	}
+
+	/* Try each file extension, in order. */
+	len = sprintf((*st)->buf, "%s", filename);
+	for (unsigned i = 0; i < sizeof u_pkg_exts / sizeof *u_pkg_exts; i++) {
+		strcpy((*st)->buf+len, u_pkg_exts[i]);
+
+		(*st)->f = upkg_fopen((*st)->buf);
+		if ((*st)->f != NULL)
+			return 1;
+	}
+
+	return 0;
+}
+
 struct upkg *u_pkg_vfs_open_by_name(const char *name)
 {
 	struct local_pkg spec = { .name = (char *)name }, *item;
+	struct foreach_state *st;
+	struct upkg *f = NULL;
 
 	if (!initialized)
 		return NULL;
@@ -134,7 +236,17 @@ struct upkg *u_pkg_vfs_open_by_name(const char *name)
 	item = avl_find(local_tree, &spec);
 	if (item)
 		return upkg_fopen(item->file);
-	return NULL;
+
+	st = malloc(sizeof *st + 256);
+	if (!st)
+		return NULL;
+	*st = (struct foreach_state) { .sz = 256, .name = name };
+
+	if (lt_dlforeachfile(u_pkg_vfs_get_search_path(), foreachfile, &st) > 0)
+		f = st->f;
+
+	free(st);
+	return f;
 }
 
 int u_pkg_vfs_init(void)