lws_dir: add rm -rf and glob filter callbacks

Bring over two general-purpose callbacks for lws_dir from Sai

include/libwebsockets/lws-misc.h

@@ -577,6 +577,53 @@ lws_dir_callback_function(const char *dirpath, void *user,
  */
 LWS_VISIBLE LWS_EXTERN int
 lws_dir(const char *dirpath, void *user, lws_dir_callback_function cb);
+
+/**
+ * lws_dir_rm_rf_cb() - callback for lws_dir that performs recursive rm -rf
+ *
+ * \param dirpath: directory we are at in lws_dir
+ * \param user: ignored
+ * \param lde: lws_dir info on the file or directory we are at
+ *
+ * This is a readymade rm -rf callback for use with lws_dir.  It recursively
+ * removes everything below the starting dir and then the starting dir itself.
+ * Works on linux, OSX and Windows at least.
+ */
+LWS_VISIBLE LWS_EXTERN int
+lws_dir_rm_rf_cb(const char *dirpath, void *user, struct lws_dir_entry *lde);
+
+/*
+ * We pass every file in the base dir through a filter, and call back on the
+ * ones that match.  Directories are ignored.
+ *
+ * The original path filter string may look like, eg, "sai-*.deb" or "*.txt"
+ */
+
+typedef int (*lws_dir_glob_cb_t)(void *data, const char *path);
+
+typedef struct lws_dir_glob {
+	const char		*filter;
+	lws_dir_glob_cb_t	cb;
+	void			*user;
+} lws_dir_glob_t;
+
+/**
+ * lws_dir_glob_cb() - callback for lws_dir that performs filename globbing
+ *
+ * \param dirpath: directory we are at in lws_dir
+ * \param user: pointer to your prepared lws_dir_glob_cb_t
+ * \param lde: lws_dir info on the file or directory we are at
+ *
+ * \p user is prepared with an `lws_dir_glob_t` containing a callback for paths
+ * that pass the filtering, a user pointer to pass to that callback, and a
+ * glob string like "*.txt".  It may not contain directories, the lws_dir musr
+ * be started at the correct dir.
+ *
+ * Only the base path passed to lws_dir is scanned, it does not look in subdirs.
+ */
+LWS_VISIBLE LWS_EXTERN int
+lws_dir_glob_cb(const char *dirpath, void *user, struct lws_dir_entry *lde);
+
 #endif
 
 /**

lib/misc/dir.c

@@ -34,52 +34,24 @@
 #include <string.h>
 #include <stdio.h>
 
+#include <sys/stat.h>
+#if defined(WIN32)
+#include <direct.h>
+#define read _read
+#define open _open
+#define close _close
+#define write _write
+#define mkdir(x,y) _mkdir(x)
+#define rmdir _rmdir
+#define unlink _unlink
+#define HAVE_STRUCT_TIMESPEC
+#if defined(pid_t)
+#undef pid_t
+#endif
+#endif /* win32 */
+
 #define COMBO_SIZEOF 256
 
-#if defined(LWS_WITH_LIBUV) && UV_VERSION_MAJOR > 0
-
-int
-lws_dir(const char *dirpath, void *user, lws_dir_callback_function cb)
-{
-	struct lws_dir_entry lde;
-	uv_dirent_t dent;
-	uv_fs_t req;
-	int ret = 1, ir;
-	uv_loop_t loop;
-
-	ir = uv_loop_init(&loop);
-	if (ir) {
-		lwsl_err("%s: loop init failed %d\n", __func__, ir);
-		return 1;
-	}
-
-	ir = uv_fs_scandir(&loop, &req, dirpath, 0, NULL);
-	if (ir < 0) {
-		lwsl_err("Scandir on %s failed, errno %d\n", dirpath, LWS_ERRNO);
-		ret = 2;
-		goto bail;
-	}
-
-	while (uv_fs_scandir_next(&req, &dent) != UV_EOF) {
-		lde.name = dent.name;
-		lde.type = (int)dent.type;
-		if (cb(dirpath, user, &lde))
-			goto bail1;
-	}
-
-	ret = 0;
-
-bail1:
-	uv_fs_req_cleanup(&req);
-bail:
-	while (uv_loop_close(&loop))
-		;
-
-	return ret;
-}
-
-#else
-
 #if !defined(LWS_PLAT_FREERTOS)
 
 #if defined(WIN32)
@@ -232,5 +204,85 @@ bail:
 
 	return ret;
 }
+
+/*
+ * Check filename against one globby filter
+ *
+ * We can support things like "*.rpm"
+ */
+
+static int
+lws_dir_glob_check(const char *nm, const char *filt)
+{
+	while (*nm) {
+		if (*filt == '*') {
+			if (!strcmp(nm, filt + 1))
+				return 1;
+		} else {
+			if (*nm != *filt)
+				return 0;
+			filt++;
+		}
+		nm++;
+	}
+
+	return 0;
+}
+
+/*
+ * We get passed a single filter string, like "*.txt" or "mydir/\*.rpm" or so.
+ */
+
+int
+lws_dir_glob_cb(const char *dirpath, void *user, struct lws_dir_entry *lde)
+{
+	lws_dir_glob_t *filter = (lws_dir_glob_t*)user;
+	char path[384];
+
+	if (!strcmp(lde->name, ".") || !strcmp(lde->name, ".."))
+		return 0;
+
+	if (lde->type == LDOT_DIR)
+		return 0;
+
+	if (lws_dir_glob_check(lde->name, filter->filter)) {
+		lws_snprintf(path, sizeof(path), "%s%c%s", dirpath, csep,
+							   lde->name);
+		filter->cb(filter->user, path);
+	}
+
+	return 0;
+}
+
+int
+lws_dir_rm_rf_cb(const char *dirpath, void *user, struct lws_dir_entry *lde)
+{
+	char path[384];
+
+	if (!strcmp(lde->name, ".") || !strcmp(lde->name, ".."))
+		return 0;
+
+	lws_snprintf(path, sizeof(path), "%s%c%s", dirpath, csep, lde->name);
+
+	if (lde->type == LDOT_DIR) {
+		lws_dir(path, NULL, lws_dir_rm_rf_cb);
+		if (rmdir(path))
+			lwsl_warn("%s: rmdir %s failed %d\n", __func__, path, errno);
+	} else {
+		if (unlink(path)) {
+#if defined(WIN32)
+			SetFileAttributesA(path, FILE_ATTRIBUTE_NORMAL);
+			if (unlink(path))
+#else
+			if (rmdir(path))
 #endif
+			lwsl_warn("%s: unlink %s failed %d (type %d)\n",
+					__func__, path, errno, lde->type);
+		}
+	}
+
+	return 0;
+}
+
+
 #endif