1 files changed, 141 insertions, 0 deletions
diff --git a/grub-core/commands/echo.c b/grub-core/commands/echo.c
new file mode 100644
index 0000000..81ba50d
--- /dev/null
+++ b/grub-core/commands/echo.c
@@ -0,0 +1,141 @@
+/* echo.c - Command to display a line of text  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2006,2007,2010  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/misc.h>
+#include <grub/extcmd.h>
+#include <grub/i18n.h>
+#include <grub/term.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static const struct grub_arg_option options[] =
+  {
+    {0, 'n', 0, N_("Do not output the trailing newline."), 0, 0},
+    {0, 'e', 0, N_("Enable interpretation of backslash escapes."), 0, 0},
+    {0, 0, 0, 0, 0, 0}
+  };
+
+static grub_err_t
+grub_cmd_echo (grub_extcmd_context_t ctxt, int argc, char **args)
+{
+  struct grub_arg_list *state = ctxt->state;
+  int newline = 1;
+  int i;
+
+  /* Check if `-n' was used.  */
+  if (state[0].set)
+    newline = 0;
+
+  for (i = 0; i < argc; i++)
+    {
+      char *arg = *args;
+      /* Unescaping results in a string no longer than the original.  */
+      char *unescaped = grub_malloc (grub_strlen (arg) + 1);
+      char *p = unescaped;
+      args++;
+
+      if (!unescaped)
+	return grub_errno;
+
+      while (*arg)
+	{
+	  /* In case `-e' is used, parse backslashes.  */
+	  if (*arg == '\\' && state[1].set)
+	    {
+	      arg++;
+	      if (*arg == '\0')
+		break;
+
+	      switch (*arg)
+		{
+		case '\\':
+		  *p++ = '\\';
+		  break;
+
+		case 'a':
+		  *p++ = '\a';
+		  break;
+
+		case 'c':
+		  newline = 0;
+		  break;
+
+		case 'f':
+		  *p++ = '\f';
+		  break;
+
+		case 'n':
+		  *p++ = '\n';
+		  break;
+
+		case 'r':
+		  *p++ = '\r';
+		  break;
+
+		case 't':
+		  *p++ = '\t';
+		  break;
+
+		case 'v':
+		  *p++ = '\v';
+		  break;
+		}
+	      arg++;
+	      continue;
+	    }
+
+	  /* This was not an escaped character, or escaping is not
+	     enabled.  */
+	  *p++ = *arg;
+	  arg++;
+	}
+
+      *p = '\0';
+      grub_xputs (unescaped);
+      grub_free (unescaped);
+
+      /* If another argument follows, insert a space.  */
+      if (i != argc - 1)
+	grub_printf (" " );
+    }
+
+  if (newline)
+    grub_printf ("\n");
+
+  grub_refresh ();  
+
+  return 0;
+}
+
+static grub_extcmd_t cmd;
+
+GRUB_MOD_INIT(echo)
+{
+  cmd = grub_register_extcmd ("echo", grub_cmd_echo,
+			      GRUB_COMMAND_ACCEPT_DASH
+			      | GRUB_COMMAND_OPTIONS_AT_START,
+			      N_("[-e|-n] STRING"), N_("Display a line of text."),
+			      options);
+}
+
+GRUB_MOD_FINI(echo)
+{
+  grub_unregister_extcmd (cmd);
+}