Add support for auto_boolean (true, false or auto).

gdb/ChangeLog

@@ -1,3 +1,15 @@
+Mon Jun 19 11:29:35 2000  Andrew Cagney  <cagney@b1.cygnus.com>
+
+	* command.h (add_set_auto_boolean_cmd): Add declaration.
+	(enum var_types): Add var_auto_boolean.
+
+	* command.c (add_set_auto_boolean_cmd): New function.
+	(do_setshow_command): 
+	(parse_binary_operation): Recognize enable and disable.
+	(parse_auto_binary_operation): Parse auto binary variables.
+
+	* TODO: Update
+
 Fri Jun 23 16:20:21 2000  Andrew Cagney  <cagney@b1.cygnus.com>
 
 	* mips-tdep.c (fp_register_arg_p): New function.

gdb/TODO

@@ -1121,6 +1121,36 @@ The way GDB throws errors and records them needs a re-think.  ui_out
 handles the correct output well.  It doesn't resolve what to do with
 output / error-messages when things go wrong.
 
+--
+
+do_setshow_command contains a 1024 byte buffer.
+
+The function assumes that there will never be any more than 1024 bytes
+of enum.  It should use mem_file.
+
+--
+
+Should struct cmd_list_element . completer take the command as an
+argument?
+
+--
+
+Should the bulk of top.c:line_completion_function() be moved to
+command.[hc]?  complete_on_cmdlist() and complete_on_enums() could
+then be made private.
+
+--
+
+top.c (execute_command): Should a command being valid when the target
+is running be made an attribute (predicate) to the command rather than
+an explicit set of tests.
+
+--
+
+top.c (execute_command): Should the bulk of this function be moved
+into command.[hc] so that top.c doesn't grub around in the command
+internals?
+
 --
 
 		Architectural Change: Async

gdb/command.c

@@ -327,6 +327,25 @@ add_set_enum_cmd (char *name,
   return c;
 }
 
+/* Add element named NAME to command list LIST (the list for set
+   or some sublist thereof).
+   CLASS is as in add_cmd.
+   VAR is address of the variable which will contain the value.
+   DOC is the documentation string.  */
+struct cmd_list_element *
+add_set_auto_boolean_cmd (char *name,
+			  enum command_class class,
+			  enum cmd_auto_boolean *var,
+			  char *doc,
+			  struct cmd_list_element **list)
+{
+  static const char *auto_boolean_enums[] = { "on", "off", "auto", NULL };
+  struct cmd_list_element *c;
+  c = add_set_cmd (name, class, var_auto_boolean, var, doc, list);
+  c->enums = auto_boolean_enums;
+  return c;
+}
+
 /* Where SETCMD has already been added, add the corresponding show
    command to LIST and return a pointer to the added command (not 
    necessarily the head of LIST).  */
@@ -1530,6 +1549,32 @@ complete_on_enum (const char *enumlist[],
   return matchlist;
 }
 
+static enum cmd_auto_boolean
+parse_auto_binary_operation (const char *arg)
+{
+  if (arg != NULL && *arg != '\0')
+    {
+      int length = strlen (arg);
+      while (isspace (arg[length - 1]) && length > 0)
+	length--;
+      if (strncmp (arg, "on", length) == 0
+	  || strncmp (arg, "1", length) == 0
+	  || strncmp (arg, "yes", length) == 0
+	  || strncmp (arg, "enable", length) == 0)
+	return CMD_AUTO_BOOLEAN_TRUE;
+      else if (strncmp (arg, "off", length) == 0
+	       || strncmp (arg, "0", length) == 0
+	       || strncmp (arg, "no", length) == 0
+	       || strncmp (arg, "disable", length) == 0)
+	return CMD_AUTO_BOOLEAN_FALSE;
+      else if (strncmp (arg, "auto", length) == 0
+	       || (strncmp (arg, "-1", length) == 0 && length > 1))
+	return CMD_AUTO_BOOLEAN_AUTO;
+    }
+  error ("\"on\", \"off\" or \"auto\" expected.");
+  return CMD_AUTO_BOOLEAN_AUTO; /* pacify GCC */
+}
+
 static int
 parse_binary_operation (arg)
      char *arg;
@@ -1544,13 +1589,15 @@ parse_binary_operation (arg)
   while (arg[length - 1] == ' ' || arg[length - 1] == '\t')
     length--;
 
-  if (!strncmp (arg, "on", length)
-      || !strncmp (arg, "1", length)
-      || !strncmp (arg, "yes", length))
+  if (strncmp (arg, "on", length) == 0
+      || strncmp (arg, "1", length) == 0
+      || strncmp (arg, "yes", length) == 0
+      || strncmp (arg, "enable", length) == 0)
     return 1;
-  else if (!strncmp (arg, "off", length)
-	   || !strncmp (arg, "0", length)
-	   || !strncmp (arg, "no", length))
+  else if (strncmp (arg, "off", length) == 0
+	   || strncmp (arg, "0", length) == 0
+	   || strncmp (arg, "no", length) == 0
+	   || strncmp (arg, "disable", length) == 0)
     return 0;
   else
     {
@@ -1635,6 +1682,9 @@ do_setshow_command (arg, from_tty, c)
 	case var_boolean:
 	  *(int *) c->var = parse_binary_operation (arg);
 	  break;
+	case var_auto_boolean:
+	  *(enum cmd_auto_boolean *) c->var = parse_auto_binary_operation (arg);
+	  break;
 	case var_uinteger:
 	  if (arg == NULL)
 	    error_no_arg ("integer to set it to.");
@@ -1760,6 +1810,23 @@ do_setshow_command (arg, from_tty, c)
 	case var_boolean:
 	  fputs_filtered (*(int *) c->var ? "on" : "off", stb->stream);
 	  break;
+	case var_auto_boolean:
+	  switch (*(enum auto_boolean*) c->var)
+	    {
+	    case CMD_AUTO_BOOLEAN_TRUE:
+	      fputs_filtered ("on", stb->stream);
+	      break;
+	    case CMD_AUTO_BOOLEAN_FALSE:
+	      fputs_filtered ("off", stb->stream);
+	      break;
+	    case CMD_AUTO_BOOLEAN_AUTO:
+	      fputs_filtered ("auto", stb->stream);
+	      break;
+	    default:
+	      internal_error ("do_setshow_command: invalid var_auto_boolean");
+	      break;
+	    }
+	  break;
 	case var_uinteger:
 	  if (*(unsigned int *) c->var == UINT_MAX)
 	    {
@@ -1813,6 +1880,23 @@ do_setshow_command (arg, from_tty, c)
 	case var_boolean:
 	  fputs_filtered (*(int *) c->var ? "on" : "off", gdb_stdout);
 	  break;
+	case var_auto_boolean:
+	  switch (*(enum cmd_auto_boolean*) c->var)
+	    {
+	    case CMD_AUTO_BOOLEAN_TRUE:
+	      fputs_filtered ("on", gdb_stdout);
+	      break;
+	    case CMD_AUTO_BOOLEAN_FALSE:
+	      fputs_filtered ("off", gdb_stdout);
+	      break;
+	    case CMD_AUTO_BOOLEAN_AUTO:
+	      fputs_filtered ("auto", gdb_stdout);
+	      break;
+	    default:
+	      internal_error ("do_setshow_command: invalid var_auto_boolean");
+	      break;
+	    }
+	  break;
 	case var_uinteger:
 	  if (*(unsigned int *) c->var == UINT_MAX)
 	    {

gdb/command.h

@@ -47,12 +47,28 @@ typedef enum cmd_types
   }
 cmd_types;
 
+/* Reasonable values for an AUTO_BOOLEAN variable. */
+enum cmd_auto_boolean
+{
+  CMD_AUTO_BOOLEAN_TRUE,
+  CMD_AUTO_BOOLEAN_FALSE,
+  CMD_AUTO_BOOLEAN_AUTO
+};
+
 /* Types of "set" or "show" command.  */
 typedef enum var_types
   {
     /* "on" or "off".  *VAR is an integer which is nonzero for on,
        zero for off.  */
     var_boolean,
+
+    /* "on" / "true" / "enable" or "off" / "false" / "disable" or
+       "auto.  *VAR is an ``enum cmd_auto_boolean''.  NOTE: In general
+       a custom show command will need to be implemented - one that
+       for "auto" prints both the "auto" and the current auto-selected
+       value. */
+    var_auto_boolean,
+
     /* Unsigned Integer.  *VAR is an unsigned int.  The user can type 0
        to mean "unlimited", which is stored in *VAR as UINT_MAX.  */
     var_uinteger,
@@ -299,6 +315,12 @@ extern struct cmd_list_element *add_set_enum_cmd (char *name,
 						  char *doc,
 						  struct cmd_list_element **list);
 
+extern struct cmd_list_element *add_set_auto_boolean_cmd (char *name,
+							  enum command_class class,
+							  enum cmd_auto_boolean *var,
+							  char *doc,
+							  struct cmd_list_element **list);
+
 extern struct cmd_list_element *add_show_from_set (struct cmd_list_element *,
 						   struct cmd_list_element
 						   **);