more tests, a few fixes

kernel/entry.cpp

@@ -184,6 +184,30 @@ extern "C" [[noreturn]] void entry() {
     ;
 }
 
+static void find_file(const char *path, size_t path_len) {
+
+  storage::canon_path cp;
+  storage::canonize_path(path, path_len, cp);
+
+  storage::block_device *bd;
+  storage::node_id_t node_id;
+  storage::canon_path cp_without_symlinks;
+
+  if (storage::look_up_absolute_path(cp, bd, node_id, true,
+        cp_without_symlinks) != storage::io_result::success) {
+    terminal::put_string_sz("failed to look up ");
+    terminal::put_string(path, path_len);
+    terminal::put_string_sz(" in vfs.");
+    halt();
+  }
+
+  terminal::put_string(path, path_len);
+  terminal::put_string_sz(" has node id ");
+  terminal::put_int_decimal(node_id);
+  terminal::put_string_sz(" in its file system.\n");
+
+}
+
 [[noreturn]] static void with_kernel_p4() {
 
   terminal::init_terminal();
@@ -211,23 +235,10 @@ extern "C" [[noreturn]] void entry() {
   terminal::put_int_decimal(free_pram_kib);
   terminal::put_string_sz(" kiB physical memory free.\n");
 
-  storage::canon_path test_path;
-  storage::canonize_path("/test.txt", 9, test_path);
-
-  storage::block_device *test_bd;
-  storage::node_id_t test_node_id;
-  storage::canon_path test_path_without_symlinks;
-
-  if (storage::look_up_absolute_path(
-        test_path, test_bd, test_node_id, true, test_path_without_symlinks) !=
-      storage::io_result::success) {
-    terminal::put_string_sz("failed to look up /test.txt in vfs.");
-    halt();
-  }
-
-  terminal::put_string_sz("/test.txt has node id ");
-  terminal::put_int_decimal(test_node_id);
-  terminal::put_string_sz(" in its file system.");
+  find_file("/", 1);
+  find_file("/test.txt", 9);
+  find_file("/dir", 4);
+  find_file("/dir/dir2", 9);
 
   halt();
 

kernel/fs/tarfs.cpp

@@ -48,6 +48,8 @@ namespace mercury::kernel::fs {
     //len <= 12
     char buffer[12];
     storage::io_result result = bd->read_bytes(offset, len, buffer);
+    if (result != storage::io_result::success)
+      return result;
     out = 0;
 
     for (size_t i = 0; i < len; ++i) {
@@ -134,7 +136,7 @@ namespace mercury::kernel::fs {
 
     char full_name[255];
     size_t full_name_len;
-    RETURN_MAYBE_NOT_FOUND(read_name(out, full_name, full_name_len))
+    RETURN_MAYBE_NOT_FOUND(read_name(node, full_name, full_name_len))
 
     if (full_name_len + name_len > 255)
       return storage::io_result::not_supported;
@@ -150,11 +152,14 @@ namespace mercury::kernel::fs {
       size_t cand_name_len;
       RETURN_MAYBE_NOT_FOUND(read_name(out, cand_name, cand_name_len))
 
-      if (cand_name_len != full_name_len)
+      if (cand_name_len != full_name_len && cand_name_len != full_name_len + 1)
         goto next_iter;
       for (size_t i = 0; i < full_name_len; ++i)
         if (cand_name[i] != full_name[i])
           goto next_iter;
+      if (cand_name_len == full_name_len + 1 &&
+          cand_name[full_name_len] != '/')
+        goto next_iter;
 
       return storage::io_result::success;
 

kernel/storage.cpp

@@ -122,7 +122,7 @@ namespace mercury::kernel::storage {
     while (len != 0) {
 
       size_t segment_len = utility::find(str, len, '/');
-      size_t to_skip = segment_len == len ? len : len + 1;
+      size_t to_skip = segment_len == len ? segment_len : segment_len + 1;
 
       if (segment_len == 0)
         ;
@@ -211,6 +211,9 @@ namespace mercury::kernel::storage {
     for (unsigned i = 0; i < prefix_length; ++i)
       path_without_symlinks_out.segments.add_end(path.segments.buffer[i]);
 
+    if (path.segments.count == 0)
+      goto on_final_node;
+
     for (unsigned i = prefix_length; i < path.segments.count - 1; ++i) {
 
       path_without_symlinks_out.segments.add_end(path.segments.buffer[i]);
@@ -228,13 +231,17 @@ namespace mercury::kernel::storage {
 
     }
 
+    {
+      //in a block so that compiler sees last_segment
+      //isn't needed after this and allows the goto above.
       const utility::string &last_segment =
         path.segments.buffer[path.segments.count - 1];
       path_without_symlinks_out.segments.add_end(last_segment);
-
       RETURN_IF_NOT_SUCCESS(bd_out->mounted_as->get_child(
         node_out, node_out, last_segment.buffer, last_segment.count))
+    }
 
+  on_final_node:
     if (resolve_final_node)
       RETURN_IF_NOT_SUCCESS(resolve_symlinks(
         bd_out, node_out, path_without_symlinks_out))

makefile

@@ -38,6 +38,7 @@ obj/kernel.elf: ${KERNEL_OBJECTS:%=obj/kernel/%.o}
 obj/initfs.tgz:
 	@mkdir -p obj/initfs
 	echo test > obj/initfs/test.txt
+	mkdir -p obj/initfs/dir/dir2
 	tar czf obj/initfs.tgz -C obj/initfs .
 
 out/disk.iso: obj/kernel.elf obj/initfs.tgz limine

qemu.gdb

@@ -3,4 +3,4 @@ symbol-file obj/kernel.elf
 set disassembly-flavor intel
 set print asm-demangle on
 break entry
-layout split
+layout src