GLK: TADS: Add a number of GLK interface methods

11 files changed, 761 insertions, 84 deletions

diff --git a/engines/glk/glk_api.cpp b/engines/glk/glk_api.cpp
index 19f8aef99f..32d6177f9a 100644
--- a/engines/glk/glk_api.cpp
+++ b/engines/glk/glk_api.cpp
@@ -394,7 +394,7 @@ void GlkAPI::glk_put_string_stream(strid_t str, const char *s) {
 	str->putBuffer(s, strlen(s));
 }
 
-void GlkAPI::glk_put_buffer(char *buf, glui32 len) {
+void GlkAPI::glk_put_buffer(const char *buf, glui32 len) {
 	_streams->getCurrent()->putBuffer(buf, len);
 }
 
diff --git a/engines/glk/glk_api.h b/engines/glk/glk_api.h
index fe25930cc2..3081ac2b27 100644
--- a/engines/glk/glk_api.h
+++ b/engines/glk/glk_api.h
@@ -100,7 +100,7 @@ public:
 	void glk_put_char_stream(strid_t str, unsigned char ch);
 	void glk_put_string(const char *s);
 	void glk_put_string_stream(strid_t str, const char *s);
-	void glk_put_buffer(char *buf, glui32 len);
+	void glk_put_buffer(const char *buf, glui32 len);
 	void glk_put_buffer_stream(strid_t str, const char *buf, glui32 len);
 	void glk_set_style(glui32 styl);
 	void glk_set_style_stream(strid_t str, glui32 styl);
diff --git a/engines/glk/module.mk b/engines/glk/module.mk
index 9a3aa37edb..89be6a2507 100644
--- a/engines/glk/module.mk
+++ b/engines/glk/module.mk
@@ -46,6 +46,7 @@ MODULE_OBJS := \
 	tads/detection.o \
 	tads/tads.o \
 	tads/tads2/ler.o \
+	tads/tads2/os.o \
 	tads/tads2/tads2.o \
 	tads/tads3/tads3.o
 
diff --git a/engines/glk/tads/tads.cpp b/engines/glk/tads/tads.cpp
index aa309279e7..5dc400b164 100644
--- a/engines/glk/tads/tads.cpp
+++ b/engines/glk/tads/tads.cpp
@@ -31,33 +31,34 @@ TADS::TADS(OSystem *syst, const GlkGameDescription &gameDesc) : GlkAPI(syst, gam
 	/*
 	 * GLK Initialization
 	 */
-	mainwin = glk_window_open(0, 0, 0, wintype_TextBuffer, 0);
 
-	if (!mainwin)
+	// Open the story window
+	story_win = glk_window_open(0, 0, 0, wintype_TextBuffer, 0);
+	if (!story_win)
 		error("fatal: could not open window!\n");
 
 	// get default colors for main window
-	if (!glk_style_measure(mainwin, style_Normal, stylehint_TextColor, &mainfg))
+	if (!glk_style_measure(story_win, style_Normal, stylehint_TextColor, &mainfg))
 		mainfg = 0;
 
-	if (!glk_style_measure(mainwin, style_Normal, stylehint_BackColor, &mainbg))
+	if (!glk_style_measure(story_win, style_Normal, stylehint_BackColor, &mainbg))
 		mainbg = 0;
 
 	// get default colors for status window
-	statuswin = glk_window_open(mainwin, winmethod_Above | winmethod_Fixed, 1,
+	status_win = glk_window_open(story_win, winmethod_Above | winmethod_Fixed, 1,
 		wintype_TextGrid, 0);
 
-	if (!glk_style_measure(statuswin, style_Normal, stylehint_TextColor, &statusfg))
+	if (!glk_style_measure(status_win, style_Normal, stylehint_TextColor, &statusfg))
 		statusfg = 0;
 
-	if (!glk_style_measure(statuswin, style_Normal, stylehint_BackColor, &statusbg))
+	if (!glk_style_measure(status_win, style_Normal, stylehint_BackColor, &statusbg))
 		statusbg = 0;
 
 	// close status window; reopened on request
-	glk_window_close(statuswin, 0);
-	statuswin = nullptr;
+	glk_window_close(status_win, 0);
+	status_win = nullptr;
 
-	glk_set_window(mainwin);
+	glk_set_window(story_win);
 }
 
 Common::Error TADS::loadGameData(strid_t file) {
diff --git a/engines/glk/tads/tads.h b/engines/glk/tads/tads.h
index 0f1565aaa9..ec9ea93f7d 100644
--- a/engines/glk/tads/tads.h
+++ b/engines/glk/tads/tads.h
@@ -34,7 +34,7 @@ namespace TADS {
  */
 class TADS : public GlkAPI {
 protected:
-	winid_t mainwin, statuswin;
+	winid_t story_win, status_win;
 	glui32 mainfg, mainbg;
 	glui32 statusfg, statusbg;
 public:
diff --git a/engines/glk/tads/tads2/ler.cpp b/engines/glk/tads/tads2/ler.cpp
index 9213d0bc5b..930fdf02a1 100644
--- a/engines/glk/tads/tads2/ler.cpp
+++ b/engines/glk/tads/tads2/ler.cpp
@@ -26,7 +26,9 @@ namespace Glk {
 namespace TADS {
 namespace TADS2 {
 
-int errfmt(char *outbuf, int outbufl, char *fmt, int argc, erradef *argv) {
+#define TRDLOGERR_PREFIX "\n[An error has occurred within TADS: "
+
+int errcxdef::errfmt(char *outbuf, int outbufl, char *fmt, int argc, erradef *argv) {
     int    outlen = 0;
     int    argi   = 0;
     int    len;
@@ -125,55 +127,26 @@ int errfmt(char *outbuf, int outbufl, char *fmt, int argc, erradef *argv) {
     return outlen;
 }
 
-#if defined(DEBUG) && !defined(ERR_NO_MACRO)
-void errjmp(jmp_buf buf, int e) {
-    longjmp(buf, e);
-}
-#endif /* DEBUG */
-
-#ifdef ERR_NO_MACRO
-
-void errsign(errcxdef *ctx, int e, char *facility) {
-    strncpy(ctx->errcxptr->errfac, facility, ERRFACMAX);
-    ctx->errcxptr->errfac[ERRFACMAX] = '\0';
-    ctx->errcxofs = 0;
-    longjmp(ctx->errcxptr->errbuf, e);
-}
-
-void errsigf(errcxdef *ctx, char *facility, int e) {
-    errargc(ctx, 0);
-    errsign(ctx, e, facility);
-}
-
-char *errstr(errcxdef *ctx, const char *str, int len) {
-    char *ret = &ctx->errcxbuf[ctx->errcxofs];
-    
-    memcpy(ret, str, (size_t)len);
-    ret[len] = '\0';
-    ctx->errcxofs += len + 1;
-    return(ret);
+void errcxdef::errcxlog(void *ctx0, char *fac, int err, int argc, erradef *argv) {
+#ifdef TODO
+	errcxdef *ctx = (errcxdef *)ctx0;
+	char      buf[256];
+	char      msg[256];
+
+	// display the prefix message to the console and log file
+	sprintf(buf, TRDLOGERR_PREFIX, fac, err);
+	trdptf("%s", buf);
+	out_logfile_print(buf, false);
+
+	/* display the error message text to the console and log file */
+	errmsg(ctx, msg, (uint)sizeof(msg), err);
+	errfmt(buf, (int)sizeof(buf), msg, argc, argv);
+	trdptf("%s]\n", buf);
+	out_logfile_print(buf, false);
+	out_logfile_print("]", true);
+#endif
 }
 
-void errrse1(errcxdef *ctx, errdef *fr) {
-    errargc(ctx, fr->erraac);
-    memcpy(ctx->errcxptr->erraav, fr->erraav,
-           (size_t)(fr->erraac * sizeof(erradef)));
-    errsign(ctx, fr->errcode, fr->errfac);
-}
-
-void errlogn(errcxdef *ctx, int err, char *facility) {
-    ctx->errcxofs = 0;
-    (*ctx->errcxlog)(ctx->errcxlgc, facility, err, ctx->errcxptr->erraac,
-                     ctx->errcxptr->erraav);
-}
-
-void errlogf(errcxdef *ctx, char *facility, int err) {
-    errargc(ctx, 0);
-    errlogn(ctx, err, facility);
-}
-
-#endif /* ERR_NO_MACRO */
-
 } // End of namespace TADS2
 } // End of namespace TADS
 } // End of namespace Glk
diff --git a/engines/glk/tads/tads2/ler.h b/engines/glk/tads/tads2/ler.h
index 5301a0f53a..000aa093f4 100644
--- a/engines/glk/tads/tads2/ler.h
+++ b/engines/glk/tads/tads2/ler.h
@@ -25,6 +25,7 @@
 
 #include "common/scummsys.h"
 #include "common/stream.h"
+#include "common/algorithm.h"
 
 namespace Glk {
 namespace TADS {
@@ -49,26 +50,47 @@ struct errdef {
 
 #define ERRBUFSIZ 512
 
+class TADS2;
+
 // seek location record for an error message by number
 struct errmfdef {
     uint  errmfnum;   // error number
     size_t errmfseek; // seek location of this message
 };
 
-struct errcxdef {
-    errdef   *errcxptr;               // current error frame
-    void    (*errcxlog)(void *, char *fac, int err, int argc, erradef *);
-                                      // error logging callback function
+class errcxdef {
+public:
+	errdef   *errcxptr;               // current error frame
     void     *errcxlgc;               // context for error logging callback
     int       errcxofs;               // offset in argument buffer
     char      errcxbuf[ERRBUFSIZ];    // space for argument strings
-    Common::SeekableReadStream *errcxfp;                // message file, if one is being used
+    Common::SeekableReadStream *errcxfp;  // message file, if one is being used
     errmfdef *errcxseek;              // seek locations of messages in file
     uint      errcxsksz;              // size of errcxseek array
     size_t    errcxbase;              // offset in physical file of logical error file
-    struct appctxdef *errcxappctx;    // host application context
+    TADS2 *   errcxappctx;            // host application context
+public:
+	/**
+	 *   Format an error message, sprintf-style, using arguments in an
+	 *   erradef array (which is passed to the error-logging callback).
+	 *   Returns the length of the output string, even if the actual
+	 *   output string was truncated because the outbuf was too short.
+	 *   (If called with outbufl == 0, nothing will be written out, but
+	 *   the size of the buffer needed, minus the terminating null byte,
+	 *   will be computed and returned.)
+	 */
+	static int errfmt(char *outbuf, int outbufl, char *fmt, int argc, erradef *argv);
+ public:
+	errcxdef() : errcxptr(nullptr), errcxlgc(nullptr), errcxofs(0),
+		errcxseek(nullptr), errcxsksz(0), errcxbase(0), errcxappctx(nullptr) {
+		Common::fill(&errcxbuf[0], &errcxbuf[ERRBUFSIZ], '\0');
+	}
+
+	/**
+	 * Error logging method
+	 */
+	void errcxlog(void *ctx0, char *fac, int err, int argc, erradef *argv);
 };
-typedef struct errcxdef errcxdef;
 
 // begin protected code
 #define ERRBEGIN(ctx) \
@@ -252,18 +274,7 @@ void errlogf(errcxdef *ctx, char *facility, int err);
  (errargv(ctx,0,typ1,arg1),errargv(ctx,1,typ2,arg2),\
   errargc(ctx,2),errlogn(ctx,e,fac))
 
-
-/**
- *   Format an error message, sprintf-style, using arguments in an
- *   erradef array (which is passed to the error-logging callback).
- *   Returns the length of the output string, even if the actual
- *   output string was truncated because the outbuf was too short.
- *   (If called with outbufl == 0, nothing will be written out, but
- *   the size of the buffer needed, minus the terminating null byte,
- *   will be computed and returned.)
- */
-extern int errfmt(char *outbuf, int outbufl, char *fmt, int argc, erradef *argv);
-  
+ 
 // get the text of an error
 void errmsg(errcxdef *ctx, char *outbuf, uint outbufl, uint err);
   
diff --git a/engines/glk/tads/tads2/os.cpp b/engines/glk/tads/tads2/os.cpp
new file mode 100644
index 0000000000..df7cb423fe
--- /dev/null
+++ b/engines/glk/tads/tads2/os.cpp
@@ -0,0 +1,309 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "glk/tads/tads2/os.h"
+
+namespace Glk {
+namespace TADS {
+namespace TADS2 {
+
+OS::OS(OSystem *syst, const GlkGameDescription &gameDesc) : TADS(syst, gameDesc),
+		status_mode(0) {
+	Common::fill(&status_left[0], &status_left[OSS_STATUS_STRING_LEN], '\0');
+	Common::fill(&status_right[0], &status_right[OSS_STATUS_STRING_LEN], '\0');
+}
+
+void OS::os_terminate(int rc) {
+	glk_exit();
+}
+
+glui32 OS::oss_convert_prompt_type(int type) {
+	if (type == OS_AFP_OPEN)
+		return filemode_Read;
+	return filemode_ReadWrite;
+}
+
+glui32 OS::oss_convert_file_type(int type) {
+	if (type == OSFTSAVE)
+		return fileusage_SavedGame;
+	if (type == OSFTLOG || type == OSFTTEXT)
+		return fileusage_Transcript;
+	return fileusage_Data;
+}
+
+glui32 OS::oss_convert_fileref_to_string(frefid_t file_to_convert, char *buffer, int buf_len) {
+	char   temp_string[32];
+	glui32 value, i = 0, digit,
+		digit_flag = false,     // Have we put a digit in the string yet?
+		divisor = 1e9;          // The max 32-bit integer is 4294967295
+
+	// This could probably be done by using sprintf("%s%ld%s") but I don't want to risk it
+	value = (glui32)file_to_convert;
+	while (divisor != 1) {
+		digit = (char)(value / divisor);
+		if (digit != 0 || digit_flag) {     // This lets us handle, eg, 102
+			temp_string[i++] = digit + '0';
+			digit_flag = true;
+		}
+		value = value % divisor;
+		divisor /= 10;
+	}
+	temp_string[i++] = (char)value + '0';
+	temp_string[i] = 0;
+	if (strlen(temp_string) + strlen(OSS_FILEREF_STRING_PREFIX) +
+		strlen(OSS_FILEREF_STRING_SUFFIX) > (size_t)buf_len)
+		return false;
+	sprintf(buffer, "%s%s%s", OSS_FILEREF_STRING_PREFIX,
+		temp_string, OSS_FILEREF_STRING_SUFFIX);
+	return true;
+}
+
+frefid_t OS::oss_convert_string_to_fileref(char *buffer, glui32 usage) {
+	char temp_string[32];
+	glui32 value = 0, i, multiplier = 1;
+
+	// Does the buffer contain a hashed fileref?
+	if (oss_is_string_a_fileref(buffer)) {
+		// If so, we need only decode the string in the middle and return its value
+		strcpy(temp_string, buffer + strlen(OSS_FILEREF_STRING_PREFIX));
+		i = strlen(temp_string) - strlen(OSS_FILEREF_STRING_SUFFIX);
+		temp_string[i] = 0;
+		while (i != 0) {
+			i--;
+			value += ((glui32)(temp_string[i] - '0') * multiplier);
+			multiplier *= 10;
+		}
+		return ((frefid_t)value);
+	}
+
+	// If not, return the new fileref
+	return (glk_fileref_create_by_name(usage, os_get_root_name(buffer), 0));
+}
+
+bool OS::oss_is_string_a_fileref(char *buffer) {
+	if ((strncmp(buffer, OSS_FILEREF_STRING_PREFIX,
+		strlen(OSS_FILEREF_STRING_PREFIX)) == 0) &&
+		(strncmp(buffer + strlen(buffer) - strlen(OSS_FILEREF_STRING_SUFFIX),
+			OSS_FILEREF_STRING_SUFFIX,
+			strlen(OSS_FILEREF_STRING_SUFFIX)) == 0))
+		return true;
+	return false;
+}
+
+unsigned char OS::oss_convert_keystroke_to_tads(glui32 key) {
+	// Characters 0 - 255 we return per normal */
+	if (key <= 255)
+		return ((unsigned char)key);
+	switch (key) {
+	case keycode_Up:
+		return CMD_UP;
+	case keycode_Down:
+		return CMD_DOWN;
+	case keycode_Left:
+		return CMD_LEFT;
+	case keycode_Right:
+		return CMD_RIGHT;
+	case keycode_PageUp:
+		return CMD_PGUP;
+	case keycode_PageDown:
+		return CMD_PGDN;
+	case keycode_Home:
+		return CMD_HOME;
+	case keycode_End:
+		return CMD_END;
+	case keycode_Func1:
+		return CMD_F1;
+	case keycode_Func2:
+		return CMD_F2;
+	case keycode_Func3:
+		return CMD_F3;
+	case keycode_Func4:
+		return CMD_F4;
+	case keycode_Func5:
+		return CMD_F5;
+	case keycode_Func6:
+		return CMD_F6;
+	case keycode_Func7:
+		return CMD_F7;
+	case keycode_Func8:
+		return CMD_F8;
+	case keycode_Func9:
+		return CMD_F9;
+	case keycode_Func10:
+		return CMD_F10;
+	default:
+		return 0;
+	}
+}
+
+bool OS::oss_check_path(char *filename) {
+	return false;
+}
+
+void OS::oss_revert_path() {
+	// No implementation
+}
+
+osfildef *OS::oss_open_stream(char *buffer, glui32 tadsusage, glui32 tbusage,
+		glui32 fmode, glui32 rock) {
+	frefid_t fileref;
+	strid_t osf;
+	int      changed_dirs;
+
+	fileref = oss_convert_string_to_fileref(buffer,
+		oss_convert_file_type(tadsusage) | tbusage);
+	changed_dirs = oss_check_path(buffer);
+	osf = glk_stream_open_file(fileref, (FileMode)fmode, rock);
+	if (changed_dirs)
+		oss_revert_path();
+	return *osf;
+}
+
+void OS::oss_put_string_with_hilite(winid_t win, const char *str, size_t len) {
+	glk_set_window(win);
+	glk_put_buffer(str, len);
+}
+
+void OS::oss_draw_status_line(void) {
+	glui32 width, height, division;
+
+	if (status_win == nullptr) return;  // In case this is a CheapGlk port
+
+	glk_window_get_size(status_win, &width, &height);
+	if (height == 0) return;  // Don't bother if status is invisible
+	division = width - strlen(status_right) - 1;
+	glk_set_window(status_win);
+	glk_window_clear(status_win);
+	oss_put_string_with_hilite(status_win, status_left, strlen(status_left));
+	glk_window_move_cursor(status_win, division, 0);
+	glk_put_string(status_right);
+}
+
+void OS::oss_change_status_string(char *dest, const char *src, size_t len) {
+	if (len > OSS_STATUS_STRING_LEN - 1)
+		len = OSS_STATUS_STRING_LEN - 1;
+	memcpy(dest, src, len);
+	dest[len] = '\0';
+}
+
+void OS::oss_change_status_left(const char *str, size_t len) {
+	oss_change_status_string(status_left, str, len);
+	oss_draw_status_line();
+}
+
+void OS::oss_change_status_right(const char *str) {
+	oss_change_status_string(status_right, str, strlen(str));
+	oss_draw_status_line();
+}
+
+int OS::memicmp(char *s1, char *s2, int len) {
+	char *x1, *x2;
+	int i, result;
+
+	x1 = (char *)malloc(len); x2 = (char *)malloc(len);
+
+	if (!x1 || !x2) {
+		glk_set_window(story_win);
+		glk_put_string("memicmp has run out of memory. Quitting.\n");
+		os_waitc();
+		glk_exit();
+	}
+
+	for (i = 0; i < len; i++) {
+		if (Common::isUpper(s1[i]))
+			x1[i] = glk_char_to_lower((unsigned char)s1[i]);
+		else x1[i] = s1[i];
+
+		if (Common::isUpper(s2[i]))
+			x2[i] = glk_char_to_lower((unsigned char)s2[i]);
+		else x2[i] = s2[i];
+	}
+
+	result = memcmp(x1, x2, len);
+	free(x1);
+	free(x2);
+	return result;
+}
+
+void OS::os_flush() {
+	glk_tick();
+}
+
+void OS::os_print(const char *str, size_t len) {
+	int current_status_mode;
+
+	// Decide what to do based on our status mode
+	current_status_mode = os_get_status();
+	if (current_status_mode == OSS_STATUS_MODE_STORY) {
+		oss_put_string_with_hilite(story_win, str, len);
+	} else if (current_status_mode == OSS_STATUS_MODE_STATUS) {
+		const char *p;
+		size_t      rem;
+
+		// The string requires some fiddling for the status window
+		for (p = str, rem = len; rem != 0 && *p == '\n'; p++, --rem);
+		if (rem != 0 && p[rem - 1] == '\n')
+			--rem;
+
+		// if that leaves anything, update the statusline
+		if (rem != 0)
+			oss_change_status_left(p, rem);
+	}
+}
+
+void OS::os_expause() {
+	os_printz("(Strike any key to exit...)");
+	os_flush();
+	os_waitc();
+}
+
+int OS::oss_getc_from_window(winid_t win) {
+	static unsigned char buffered_char = 0;
+	int i;
+	event_t ev;
+
+	if (buffered_char != 0) {
+		i = (int)buffered_char;
+		buffered_char = 0;
+		return i;
+	}
+	glk_request_char_event(win);
+	do {
+		glk_select(&ev);
+		if (ev.type == evtype_Arrange)
+			oss_draw_status_line();
+	} while (ev.type != evtype_CharInput);
+	if (ev.val1 == keycode_Return)
+		ev.val1 = '\n';
+	else if (ev.val1 == keycode_Tab)
+		ev.val1 = '\t';
+	if (ev.val1 <= 255)
+		return ((int)ev.val1);
+
+	// We got a special character, so handle it appropriately
+	buffered_char = oss_convert_keystroke_to_tads(ev.val1);
+	return 0;
+}
+
+} // End of namespace TADS2
+} // End of namespace TADS
+} // End of namespace Glk
diff --git a/engines/glk/tads/tads2/os.h b/engines/glk/tads/tads2/os.h
new file mode 100644
index 0000000000..ba0058d98a
--- /dev/null
+++ b/engines/glk/tads/tads2/os.h
@@ -0,0 +1,334 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef GLK_TADS_TADS2_OS
+#define GLK_TADS_TADS2_OS
+
+#include "glk/tads/tads.h"
+
+namespace Glk {
+namespace TADS {
+namespace TADS2 {
+
+/**
+ * The character (or characters) which mark the beginning of a special fileref string.
+ * The important thing is that the string be one that is either not allowed in
+ * filenames on your platform or is unlikely to be the first part of a filename.
+ */
+#define OSS_FILEREF_STRING_PREFIX ":"
+
+/**
+ * The character (or characters) which mark the end of a special fileref string.
+ * Using this and OSS_FILEREF_STRING_PREFIX, you should be able to come up with
+ * something which forms an invalid filename
+ */
+#define OSS_FILEREF_STRING_SUFFIX ""
+
+/**
+ * Maximum length of status line text
+ */
+#define OSS_STATUS_STRING_LEN 80
+
+/**
+ * Important note: do not change these values when porting TADS.  These
+ * values can be used by games, so they must be the same on all platforms.  
+ */
+enum {
+	OS_AFP_OPEN = 1,			///< choose an existing file to open for reading
+	OS_AFP_SAVE = 2				///< choose a filename for saving to a file
+};
+
+/**
+ * File types.These type codes are used when opening or creating a file,
+ * so that the OS routine can set appropriate file system metadata
+ * to describe or find the file type.
+ *
+ * The type os_filetype_t is defined for documentary purposes; it's
+ * always just an int.
+ */
+enum os_filetype_t {
+	OSFTGAME  =  0,		///< a game data file (.gam)
+	OSFTSAVE  =  1,     ///< a saved game (.sav)
+	OSFTLOG   =  2,     ///< a transcript (log) file
+	OSFTSWAP  =  3,     ///< swap file
+	OSFTDATA  =  4,     ///< user data file (used with the TADS fopen() call)
+	OSFTCMD   =  5,     ///< QA command/log file
+	OSFTERRS  =  6,     ///< error message file
+	OSFTTEXT  =  7,     ///< text file - used for source files
+	OSFTBIN   =  8,     ///< binary file of unknown type - resources, etc
+	OSFTCMAP  =  9,     ///< character mapping file
+	OSFTPREF  = 10,     ///< preferences file
+	OSFTUNK   = 11,     ///< unknown - as a filter, matches any file type
+	OSFTT3IMG = 12,     ///< T3 image file (.t3 - formerly .t3x)
+	OSFTT3OBJ = 13,     ///< T3 object file (.t3o)
+	OSFTT3SYM = 14,     ///< T3 symbol export file (.t3s)
+	OSFTT3SAV = 15      ///< T3 saved state file (.t3v)
+};
+
+/**
+ * Constants for os_getc() when returning commands.  When used for command line
+ * editing, special keys (arrows, END, etc.)  should cause os_getc() to return 0,
+ * and return the appropriate CMD_ value on the NEXT call.  Hence, os_getc() must
+ * keep the appropriate information around statically for the next call when a
+ * command key is issued.
+ *
+ * The comments indicate which CMD_xxx codes are "translated" codes and which are
+ * "raw"; the difference is that, when a particular keystroke could be interpreted
+ * as two different CMD_xxx codes, one translated and the other raw, os_getc()
+ * should always return the translated version of the key, and os_getc_raw()
+ * should return the raw version.
+ */
+enum KeyCmd {
+	CMD_UP    =  1,		///< move up/up arrow (translated)
+	CMD_DOWN  =  2,		///< move down/down arrow (translated)
+	CMD_RIGHT =  3,		///< move right/right arrow (translated)
+	CMD_LEFT  =  4,		///< move left/left arrow (translated)
+	CMD_END   =  5,		///< move cursor to end of line (translated)
+	CMD_HOME  =  6,		///< move cursor to start of line (translated)
+	CMD_DEOL  =  7,		///< delete to end of line (translated)
+	CMD_KILL  =  8,		///< delete entire line (translated)
+	CMD_DEL   =  9,		///< delete current character (translated)
+	CMD_SCR   = 10,		///< toggle scrollback mode (translated)
+	CMD_PGUP  = 11,		///< page up (translated)
+	CMD_PGDN  = 12,		///< page down (translated)
+	CMD_TOP   = 13,		///< top of file (translated)
+	CMD_BOT   = 14,		///< bottom of file (translated)
+	CMD_F1    = 15,		///< function key F1 (raw)
+	CMD_F2    = 16,		///< function key F2 (raw)
+	CMD_F3    = 17,		///< function key F3 (raw)
+	CMD_F4    = 18,		///< function key F4 (raw)
+	CMD_F5    = 19,		///< function key F5 (raw)
+	CMD_F6    = 20,		///< function key F6 (raw)
+	CMD_F7    = 21,		///< function key F7 (raw)
+	CMD_F8    = 22,		///< function key F8 (raw)
+	CMD_F9    = 23,		///< function key F9 (raw)
+	CMD_F10   = 24,		///< function key F10 (raw)
+	CMD_CHOME = 25,		///< control-home (raw)
+	CMD_TAB   = 26,		///< tab (translated)
+	CMD_SF2   = 27,		///< shift-F2 (raw)
+	///< not used (obsolete) - 28
+	CMD_WORD_LEFT  = 29,	///< word left (ctrl-left on dos) (translated)
+	CMD_WORD_RIGHT = 30,	///< word right (ctrl-right on dos) (translated)
+	CMD_WORDKILL   = 31,	///< delete word right (translated)
+	CMD_EOF        = 32,	///< end-of-file (raw)
+	CMD_BREAK      = 33,	///< break (Ctrl-C or local equivalent) (translated)
+	CMD_INS        = 34,	///< insert key (raw)
+
+	/**
+	 * ALT-keys - add alphabetical code to CMD_ALT: ALT-A == CMD_ALT + 0,
+	 * ALT-B == CMD_ALT + 1, ALT-C == CMD_ALT + 2, etc
+	 *
+	 * These keys are all raw (untranslated).
+	 */
+	CMD_ALT   = 128		///< start of ALT keys
+};
+
+/**
+ * Status mode codes
+ */
+enum StatusMode {
+	OSS_STATUS_MODE_STORY = 0,
+	OSS_STATUS_MODE_STATUS = 1
+};
+
+typedef Common::SeekableReadStream osfildef;
+
+/**
+ * Operating system compatibility layer
+ */
+class OS : public TADS {
+protected:
+	char status_left[OSS_STATUS_STRING_LEN];
+	char status_right[OSS_STATUS_STRING_LEN];
+	int status_mode;
+protected:
+	/**
+	 * Constructor
+	 */
+	OS(OSystem *syst, const GlkGameDescription &gameDesc);
+
+	/**
+	 * Terminates the game
+	 */
+	void os_terminate(int rc);
+
+	/**
+	 * \defgroup Type Conversions
+	 * @{
+	 */
+
+	/**
+	 * Change a TADS prompt type (OS_AFP_*) into a Glk prompt type.
+	 */
+	glui32 oss_convert_prompt_type(int type);
+	
+	/**
+	 * Change a TADS file type (OSFT*) into a Glk file type.
+	 */
+	glui32 oss_convert_file_type(int type);
+
+	/**
+	 * Change a fileref ID (frefid_t) to a special string and put it in the
+	 * buffer which is passed to it. The string is given by
+	 *   OSS_FILEREF_STRING_PREFIX + 'nnnnn' + OSS_FILEREF_STRING_SUFFIX
+	 * where 'nnnnn' is the frefid_t pointer converted into a string of decimal
+	 * numbers. This is only really practical for 32-bit pointers; if we use
+	 * 64-bit pointers I'll have to start using a hash table or use hex
+	 * numbers.
+	 */
+	glui32 oss_convert_fileref_to_string(frefid_t file_to_convert, char *buffer, int buf_len);
+
+	/**
+	 * Turn a filename or a special fileref string into an actual fileref.
+	 * Notice that, since Glk doesn't know paths, we take this opportunity to
+	 * call oss_check_path, which should do the OS-dependent path changing
+	 * in the event that the filename contains path information
+	 */
+	frefid_t oss_convert_string_to_fileref(char *buffer, glui32 usage);
+
+	/**
+	 * Tell us if the passed string is a hashed fileref or not
+	 */
+	bool oss_is_string_a_fileref(char *buffer);
+
+	/**
+	 * Change a Glk key into a TADS one, using the CMD_xxx codes
+	 */
+	unsigned char oss_convert_keystroke_to_tads(glui32 key);
+
+	/**@}*/
+
+	/**
+	 * \defgroup Directory/File methods
+	 * @{
+	 */
+
+	/**
+	 * If a filename contains path information, change dirs to that path.
+	 * Returns true if the path was fiddled with
+	 */
+	bool oss_check_path(char *filename);
+
+	/**
+	 * In case we changed directories in oss_check_path, change back to the
+	 * original executable directory
+	 */
+	void oss_revert_path();
+
+	/**
+	 * Open a stream, given a string, usage, and a filemode. tadsusage is the
+	 * TADS filemode (OSFT*); tbusage is either fileusage_TextMode or
+	 * fileusage_BinaryMode (from Glk).
+	 */
+	osfildef *oss_open_stream(char *buffer, glui32 tadsusage, glui32 tbusage,
+		glui32 fmode, glui32 rock);
+
+	/**
+	 * Get a pointer to the root name portion of a filename.  This is the part
+	 * of the filename after any path or directory prefix.  For example, on
+	 * Unix, given the string "/home/mjr/deep.gam", this function should return
+	 * a pointer to the 'd' in "deep.gam".  If the filename doesn't appear to
+	 * have a path prefix, it should simply return the argument unchanged.
+	 */
+	const char *os_get_root_name(const char *buf) const { return buf; }
+
+	/**@}*/
+
+	/**
+	 * \defgroup The main text area print routines
+	 * @{
+	 */
+
+	/**
+	 * Process hilighting codes while printing a string
+	 */
+	void oss_put_string_with_hilite(winid_t win, const char *str, size_t len);
+
+	/**
+	 * Status line handling
+	 */
+	void oss_draw_status_line();
+
+	void oss_change_status_string(char *dest, const char *src, size_t len);
+	void oss_change_status_left(const char *str, size_t len);
+	void oss_change_status_right(const char *str);
+	int os_get_status() const { return status_mode; }
+
+	/**
+	 * Flush the output
+	 */
+	void os_flush();
+
+	/**
+	 * Print a null terminated string
+	 */
+	void os_printz(const char *str) { os_print(str, strlen(str)); }
+
+	/**
+	 * Print a string
+	 */
+	void os_print(const char *str, size_t len);
+
+	/**
+	 * Compare two strings
+	 */
+	int memicmp(char *s1, char *s2, int len);
+
+	/**@}*/
+
+	/**
+	 * \defgroup Input routines
+	 * @{
+	 */
+
+	/**
+	 * Wait for a key to be hit
+	 */
+	void os_waitc(void) { os_getc(); }
+
+	/**
+	 * Get a character from the keyboard. For extended characters, return 0,
+	 * then return the extended key at the next call to this function
+	 */
+	int os_getc() {
+		return oss_getc_from_window(story_win);
+	}
+
+	/**
+	 * Accept a keystroke in the passed window
+	 */
+	int oss_getc_from_window(winid_t win);
+
+
+	/**
+	 * Print a message (with os_print) and wait for a key
+	 */
+	void os_expause();
+
+	/**@}*/
+};
+
+} // End of namespace TADS2
+} // End of namespace TADS
+} // End of namespace Glk
+
+#endif
diff --git a/engines/glk/tads/tads2/tads2.cpp b/engines/glk/tads/tads2/tads2.cpp
index 81f7272f85..9c50c20d24 100644
--- a/engines/glk/tads/tads2/tads2.cpp
+++ b/engines/glk/tads/tads2/tads2.cpp
@@ -26,11 +26,46 @@ namespace Glk {
 namespace TADS {
 namespace TADS2 {
 
-TADS2::TADS2(OSystem *syst, const GlkGameDescription &gameDesc) : TADS(syst, gameDesc) {
+TADS2::TADS2(OSystem *syst, const GlkGameDescription &gameDesc) : OS(syst, gameDesc) {
 }
 
 void TADS2::runGame(Common::SeekableReadStream *gameFile) {
-	// TODO
+	errcxdef errctx;
+	errctx.errcxlgc = &errctx;
+	errctx.errcxfp = nullptr;
+	errctx.errcxofs = 0;
+	errctx.errcxappctx = this;
+
+	/* copyright-date-string */
+#ifdef T2_COPYRIGHT_NOTICE
+	trdptf("%s - A %s TADS %s Interpreter.\n",
+		G_tads_oem_app_name, G_tads_oem_display_mode,
+		TADS_RUNTIME_VERSION);
+	trdptf("%sopyright (c) 1993, 2012 by Michael J. Roberts.\n",
+		G_tads_oem_copyright_prefix ? "TADS c" : "C");
+	trdptf("%s\n", G_tads_oem_author);
+#endif
+
+	trdmain1(&errctx);
+
+	// pause before exiting if the OS desires it
+	os_expause();
+}
+
+void TADS2::trdmain1(errcxdef *errctx) {
+
+}
+
+void TADS2::trdptf(const char *fmt, ...) {
+	va_list va;
+
+	// format the string */
+	va_start(va, fmt);
+	Common::String msg = Common::String::vformat(fmt, va);
+	va_end(va);
+
+	// print the formatted buffer
+	os_printz(msg);
 }
 
 } // End of namespace TADS2
diff --git a/engines/glk/tads/tads2/tads2.h b/engines/glk/tads/tads2/tads2.h
index e07b5c8bc4..2c799a36e7 100644
--- a/engines/glk/tads/tads2/tads2.h
+++ b/engines/glk/tads/tads2/tads2.h
@@ -23,7 +23,8 @@
 #ifndef GLK_TADS_TADS2
 #define GLK_TADS_TADS2
 
-#include "glk/tads/tads.h"
+#include "glk/tads/tads2/os.h"
+#include "glk/tads/tads2/ler.h"
 
 namespace Glk {
 namespace TADS {
@@ -32,7 +33,10 @@ namespace TADS2 {
 /**
  * TADS 2 game interpreter
  */
-class TADS2 : public TADS {
+class TADS2 : public OS {
+private:
+	// STUBS
+	void os_printz(const Common::String &s) {}
 public:
 	/**
 	 * Constructor
@@ -48,8 +52,17 @@ public:
 	 * Returns the running interpreter type
 	 */
 	virtual InterpreterType getInterpreterType() const override { return INTERPRETER_TADS2; }
+
+	void trdmain1(errcxdef *errctx);
+
+	/**
+	 * printf-style formatting
+	 */
+	void trdptf(const char *fmt, ...);
 };
 
+typedef TADS2 appctxdef;
+
 } // End of namespace TADS2
 } // End of namespace TADS
 } // End of namespace Glk