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/*
* zip.c
*
* Z code interpreter main routine. Plays Infocom type 1, 2, 3, 4 and 5 games.
*
* Usage: zip [options] story-file-name
*
* options are:
*
* -l n - number of lines in display
* -c n - number of columns in display
* -r n - right margin (default = 0)
* -t n - top margin (default = 0)
*
* This is a no bells and whistles Infocom interpreter for type 1 to 5 games.
* It will automatically detect which type of game you want to play. It should
* support all type 1 to 5 features and is based loosely on the MS-DOS version
* with enhancements to aid portability. Read the readme.1st file for
* information on building this program on your favourite operating system.
* Please mail me, at the address below, if you find bugs in the code.
*
* Special thanks to David Doherty and Olaf Barthel for testing this program
* and providing invaluable help and code to aid its portability.
*
* Mark Howell 10-Mar-93 V2.0 howell_ma@movies.enet.dec.com
*
* Disclaimer:
*
* You are expressly forbidden to use this program if in so doing you violate
* the copyright notice supplied with the original Infocom game.
*
*/
#include "ztypes.h"
#ifdef __STDC__
static void configure (zbyte_t, zbyte_t);
#else
static void configure ();
#endif
/*
* main
*
* Initialise environment, start interpreter, clean up.
*
*/
#ifdef __STDC__
int main (int argc, char *argv[])
#else
int main (argc, argv)
int argc;
char *argv[];
#endif
{
process_arguments (argc, argv);
configure (V1, V8);
initialize_screen ();
load_cache ();
restart ();
(void) interpret ();
unload_cache ();
close_story ();
close_script ();
reset_screen ();
exit (EXIT_SUCCESS);
return (0);
}/* main */
/*
* configure
*
* Initialise global and type specific variables.
*
*/
#ifdef __STDC__
static void configure (zbyte_t min_version, zbyte_t max_version)
#else
static void configure (min_version, max_version)
zbyte_t min_version;
zbyte_t max_version;
#endif
{
zbyte_t header[PAGE_SIZE];
read_page (0, header);
datap = header;
h_type = get_byte (H_TYPE);
if (h_type < min_version || h_type > max_version || (get_byte (H_CONFIG) & CONFIG_BYTE_SWAPPED))
fatal ("wrong game or version");
if (h_type < V4) {
story_scaler = 2;
story_shift = 1;
property_mask = P3_MAX_PROPERTIES - 1;
property_size_mask = 0xe0;
} else if (h_type < V8) {
story_scaler = 4;
story_shift = 2;
property_mask = P4_MAX_PROPERTIES - 1;
property_size_mask = 0x3f;
} else {
story_scaler = 8;
story_shift = 3;
property_mask = P4_MAX_PROPERTIES - 1;
property_size_mask = 0x3f;
}
h_config = get_byte (H_CONFIG);
h_version = get_word (H_VERSION);
h_data_size = get_word (H_DATA_SIZE);
h_start_pc = get_word (H_START_PC);
h_words_offset = get_word (H_WORDS_OFFSET);
h_objects_offset = get_word (H_OBJECTS_OFFSET);
h_globals_offset = get_word (H_GLOBALS_OFFSET);
h_restart_size = get_word (H_RESTART_SIZE);
h_flags = get_word (H_FLAGS);
h_synonyms_offset = get_word (H_SYNONYMS_OFFSET);
h_file_size = get_word (H_FILE_SIZE);
if (h_file_size == 0)
h_file_size = get_story_size ();
h_checksum = get_word (H_CHECKSUM);
h_alternate_alphabet_offset = get_word (H_ALTERNATE_ALPHABET_OFFSET);
datap = NULL;
}/* configure */
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