Nearly complete rewrite of cgpt tool.

cgpt/cgpt.c

Index: cgpt/cgpt.c
diff --git a/cgpt/cgpt.c b/cgpt/cgpt.c
new file mode 100644
index 0000000000000000000000000000000000000000..d80bffea28eea3d46b289e49fdbd16c476cab56a
--- /dev/null
+++ b/cgpt/cgpt.c
@@ -0,0 +1,75 @@
+/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Utility for ChromeOS-specific GPT partitions, Please see corresponding .c
+ * files for more details.
+ */
+
+#include "cgpt.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+
+const char* progname;
+const char* command;
+
+struct {
+  const char *name;
+  int (*fp)(int argc, char *argv[]);
+  const char *comment;
+} cmds[] = {
+  {"create", cmd_create, "Create or reset GPT headers and tables"},
+  {"add", cmd_add, "Add, edit or remove a partition entry"},
+  {"show", cmd_show, "Show partition table and entries"},
+  {"repair", cmd_repair, "Repair damaged GPT headers and tables"},
+  {"boot", cmd_boot, "Edit the PMBR sector for legacy BIOSes"},
+};
+
+
+void Usage(void) {
+  int i;
+
+  printf("Usage: %s COMMAND [OPTIONS] DRIVE\n\n"
+         "Supported COMMANDs:\n\n",
+         progname);
+
+  for (i = 0; i < sizeof(cmds)/sizeof(cmds[0]); ++i) {
+    printf("    %-10s  %s\n", cmds[i].name, cmds[i].comment);
+  }
+  printf("\nFor more detailed usage, use %s COMMAND -h\n\n", progname);
+}
+
+
+
+int main(int argc, char *argv[]) {
+  int i;
+
+  progname = strrchr(argv[0], '/');
+  if (progname)
+    progname++;
+  else
+    progname = argv[0];
+
+  if (argc < 2) {
+    Usage();
+    return CGPT_FAILED;
+  }
+
+  // increment optind now, so that getopt skips argv[0] in command function
+  command = argv[optind++];
+
+  // Find the command to invoke.
+  for (i = 0; command && i < sizeof(cmds)/sizeof(cmds[0]); ++i) {
+    if (0 == strcmp(cmds[i].name, command)) {
+      return cmds[i].fp(argc, argv);
+    }
+  }
+
+  // Couldn't find the command.
+  Usage();
+
+  return CGPT_FAILED;
+}