automake commit without merge history

grub-core/script/function.c

@@ -0,0 +1,126 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2005,2007,2009,2010  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/misc.h>
+#include <grub/script_sh.h>
+#include <grub/parser.h>
+#include <grub/mm.h>
+
+static grub_script_function_t grub_script_function_list;
+
+grub_script_function_t
+grub_script_function_create (struct grub_script_arg *functionname_arg,
+			     struct grub_script *cmd)
+{
+  grub_script_function_t func;
+  grub_script_function_t *p;
+
+  func = (grub_script_function_t) grub_malloc (sizeof (*func));
+  if (! func)
+    return 0;
+
+  func->name = grub_strdup (functionname_arg->str);
+  if (! func->name)
+    {
+      grub_free (func);
+      return 0;
+    }
+
+  func->func = cmd;
+
+  /* Keep the list sorted for simplicity.  */
+  p = &grub_script_function_list;
+  while (*p)
+    {
+      if (grub_strcmp ((*p)->name, func->name) >= 0)
+	break;
+
+      p = &((*p)->next);
+    }
+
+  /* If the function already exists, overwrite the old function.  */
+  if (*p && grub_strcmp ((*p)->name, func->name) == 0)
+    {
+      grub_script_function_t q;
+
+      q = *p;
+      grub_script_free (q->func);
+      q->func = cmd;
+      grub_free (func);
+      func = q;
+    }
+  else
+    {
+      func->next = *p;
+      *p = func;
+    }
+
+  return func;
+}
+
+void
+grub_script_function_remove (const char *name)
+{
+  grub_script_function_t *p, q;
+
+  for (p = &grub_script_function_list, q = *p; q; p = &(q->next), q = q->next)
+    if (grub_strcmp (name, q->name) == 0)
+      {
+        *p = q->next;
+	grub_free (q->name);
+	grub_script_free (q->func);
+        grub_free (q);
+        break;
+      }
+}
+
+grub_script_function_t
+grub_script_function_find (char *functionname)
+{
+  grub_script_function_t func;
+
+  for (func = grub_script_function_list; func; func = func->next)
+    if (grub_strcmp (functionname, func->name) == 0)
+      break;
+
+  if (! func)
+    grub_error (GRUB_ERR_UNKNOWN_COMMAND, "unknown command `%.20s'", functionname);
+
+  return func;
+}
+
+int
+grub_script_function_iterate (int (*iterate) (grub_script_function_t))
+{
+  grub_script_function_t func;
+
+  for (func = grub_script_function_list; func; func = func->next)
+    if (iterate (func))
+      return 1;
+
+  return 0;
+}
+
+int
+grub_script_function_call (grub_script_function_t func,
+			   int argc __attribute__((unused)),
+			   char **args __attribute__((unused)))
+{
+  /* XXX: Arguments are not supported yet.  */
+  return grub_script_execute (func->func);
+}