recompile not needed when switching games

debugger skeleton implemented

svn-id: r3442

debug.cpp

@@ -0,0 +1,143 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2001  Ludvig Strigeus
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * Change Log:
+ * $Log$
+ * Revision 1.1  2001/10/23 19:51:50  strigeus
+ * recompile not needed when switching games
+ * debugger skeleton implemented
+ *
+ *
+ */
+
+#include "stdafx.h"
+#include "scumm.h"
+
+
+enum {
+	CMD_INVALID,
+	CMD_HELP,
+	CMD_QUIT,
+	CMD_GO,
+};
+
+void ScummDebugger::attach(Scumm *s) {
+	if (_s)
+		deattach();
+
+	_welcome = true;
+	_s = s;
+	s->_debugger = this;
+
+	_go_amount = 1;
+}
+
+bool ScummDebugger::do_command() {
+	int cmd;
+
+	switch(get_command()) {
+	case CMD_HELP:
+		printf("Debugger commands:\n"
+		       "help -> display this help text\n"
+			   "quit -> quit the debugger\n"
+			   "step -> increase one frame\n"
+			   );
+		return true;
+
+	case CMD_QUIT:
+		detach();
+		return false;
+
+	case CMD_GO:
+		if (!_parameters[0])
+			_go_amount = 1;
+		else
+			_go_amount = atoi(_parameters);
+		return false;
+	
+	}
+}
+
+void ScummDebugger::enter() {
+	if (_welcome) {
+		_welcome = false;
+		printf("Debugging Mode entered!, please switch to this console for input.\n"
+		       "Enter h to list all the debug commands\n");
+	}
+	while(do_command()) {}
+}
+
+
+void ScummDebugger::on_frame() {
+	if (_go_amount==0)
+		return;
+	if (!--_go_amount)
+		enter();
+}
+
+
+void ScummDebugger::detach() {
+	_s->_debugger = NULL;
+	_s = NULL;
+}
+
+struct DebuggerCommands {
+	char text[8];
+	byte len;
+	byte id;
+};
+
+static const DebuggerCommands debugger_commands[] = {
+	{ "h", 1, CMD_HELP },
+	{ "q", 1, CMD_QUIT },
+	{ "g", 1, CMD_GO },
+	{ 0, 0, 0 },
+};
+
+int ScummDebugger::get_command() {
+	const DebuggerCommands *dc;
+	char *s;
+	int i;
+
+	do {
+		printf("debug> ");
+		if (!fgets(_cmd_buffer, sizeof(_cmd_buffer), stdin))
+			return CMD_QUIT;
+
+		i = strlen(_cmd_buffer);
+		while (i>0 && _cmd_buffer[i-1]==10)
+			_cmd_buffer[--i] = 0;
+
+		if (i==0)
+			continue;
+						
+		dc = debugger_commands;
+		do {
+			if (!strncmp(_cmd_buffer, dc->text, dc->len)) {
+				for(s=_cmd_buffer;*s;s++) {
+					if (*s==32) { s++; break; }
+				}
+				_parameters = s;
+				return _command = dc->id;
+			}
+		} while ((++dc)->text[0]);
+		
+		for(s=_cmd_buffer;*s;s++)
+			if (*s==32) { *s=0; break; }
+		printf("Invalid command '%s'. Type 'help' for a list of available commands.\n", _cmd_buffer);
+	} while (1);
+}