mufs: implement mufs_rmpath() to remove file system nodes

source/fs/mufs/path.c

@@ -67,6 +67,41 @@ int mufs_mkpath(struct mufs *fs, const char *path, unsigned type)
 	return -1;
 }
 
+int mufs_rmpath(struct mufs *fs, const char *path, unsigned type)
+{
+	struct flash_dev *dev = fs->dev;
+	char data[1 << dev->log2_block_size];
+	struct mufs_dentry *entry;
+	struct mufs_tree *tree;
+	char *s;
+	uint32_t va, offset, len;
+
+	if (!(s = mufs_abspath(path)))
+		return -1;
+
+	if (!(tree = resolve_path(fs, s, NULL))) {
+		free(s);
+		return -1;
+	}
+
+	offset = tree->va & ((UINT32_C(1) << dev->log2_block_size) - 1);
+	va = align(tree->va, dev->log2_block_size);
+
+	if (mufs_tree_read(tree, data, va, 1 << dev->log2_block_size) == 0)
+		return -1;
+
+	entry = (struct mufs_dentry *)(data + offset);
+	len = sizeof *entry + entry->path_len;
+
+	memmove(data + offset, data + offset + len,
+		(UINT32_C(1) << dev->log2_block_size) - offset - len);
+
+	if (mufs_tree_write(tree, data, va, 1 << dev->log2_block_size) == 0)
+		return -1;
+
+	return 0;
+}
+
 int mufs_stat(struct mufs *fs, const char *path, struct mufs_stat *stat)
 {
 	if (!resolve_path(fs, path, stat))

source/fs/mufs/path.h

@@ -1,3 +1,4 @@
 #pragma once
 
 int mufs_mkpath(struct mufs *fs, const char *path, unsigned type);
+int mufs_rmpath(struct mufs *fs, const char *path, unsigned type);