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291 lines
6.9 KiB
C
291 lines
6.9 KiB
C
/*
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* option.c
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*
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* This file contains the functions which support our CLI options; you
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* are both able to parse options and retrieve information from that
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* option parsing.
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*/
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#include <errno.h>
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#include <getopt.h>
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#include <string.h>
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#include <unistd.h>
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#include "option.h"
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#include "log.h"
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/*
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* These are the file inputs we may have to the system. What their
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* contents are will vary based on emulation context, and these values
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* may change through the course of the program's execution.
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*/
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static FILE *input1 = NULL;
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static FILE *input2 = NULL;
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/*
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* The size of our error buffer for anything we want to record while our
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* option parsing goes on.
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*/
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#define ERRBUF_SIZE 2048
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/*
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* The alluded-to error buffer.
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*/
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static char error_buffer[ERRBUF_SIZE] = "";
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/*
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* The default width and height of the window. This is "roughly"
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* 640x480, but because the Apple II has a 4.375:3 aspect ratio, we had
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* to bump up the width to a number that respects that ratio.
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*/
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static int width = 700;
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static int height = 480;
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static int flags = 0;
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/*
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* These are all of the options we allow in our long-form options. It's
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* a bit faster to identify them by integer symbols than to do string
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* comparisons.
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*/
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enum options {
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DISK1,
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DISK2,
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HELP,
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SIZE,
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FLASH,
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DISASSEMBLE,
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};
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/*
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* Here are the options we support for program execution.
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*/
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static struct option long_options[] = {
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{ "disassemble", 0, NULL, DISASSEMBLE },
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{ "disk1", 1, NULL, DISK1 },
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{ "disk2", 1, NULL, DISK2 },
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{ "flash", 0, NULL, FLASH },
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{ "help", 0, NULL, HELP },
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{ "size", 1, NULL, SIZE },
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};
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/*
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* This simply returns the pointer of our error buffer, with the
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* qualification that the caller cannot modify the error buffer once
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* they get the pointer back.
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*/
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const char *
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option_get_error()
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{
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return error_buffer;
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}
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/*
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* Directly set the error buffer with something (that has to be less
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* than ERRBUF_SIZE). This function is not itself hugely useful, but
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* does allow for some better testing on option_error().
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*/
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void
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option_set_error(const char *str)
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{
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// Use `- 1` so that we can ensure error_buffer is NUL-terminated.
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// Otherwise, strncpy will copy all of src but leave the dst
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// unterminated. Not that we're _likely_ to so self-injure
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// ourselves, but, ya know.
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strncpy(error_buffer, str, ERRBUF_SIZE - 1);
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}
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/*
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* Parse our command-line arguments from the given argc and argv. This
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* may or may not be what the kernel passes into the main() function!
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* We return 1 if we can continue beyond the option parse phase, and 0
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* if something came up to cause us to exit early. But whether you
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* actually exit early is left up to the caller.
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*/
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int
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option_parse(int argc, char **argv)
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{
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int index;
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int opt = -1;
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// To begin with, let's (effectively) NUL-out the error buffer.
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error_buffer[0] = '\0';
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do {
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int input_source = 0;
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opt = getopt_long_only(argc, argv, "", long_options, &index);
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switch (opt) {
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case DISASSEMBLE:
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flags |= OPTION_DISASSEMBLE;
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break;
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case DISK1:
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input_source = 1;
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break;
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case DISK2:
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input_source = 2;
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break;
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case FLASH:
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flags |= OPTION_FLASH;
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break;
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case HELP:
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option_print_help();
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// The help option should terminate normal execution
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return 0;
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case SIZE:
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if (option_set_size(optarg) != OK) {
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return 0;
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}
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break;
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}
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// We seem to have a request to load a file, so let's do so.
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if (input_source) {
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if (!option_read_file(input_source, optarg)) {
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return 0;
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}
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}
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} while (opt != -1);
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return 1;
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}
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/*
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* Given a file path, we open a FILE stream and set our given input
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* source to that stream. If we cannot do so, we will set an error
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* string in the buffer. Assuming all goes well, we will return 1, and
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* 0 if not.
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*/
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int
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option_read_file(int source, const char *file)
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{
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FILE *stream;
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if (!file) {
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snprintf(error_buffer,
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ERRBUF_SIZE,
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"No file given for --disk%d\n",
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source);
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return 0;
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}
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stream = fopen(file, "r+");
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if (stream == NULL) {
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snprintf(error_buffer,
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ERRBUF_SIZE,
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"--disk%d: %s",
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source,
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strerror(errno));
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return 0;
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}
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option_set_input(source, stream);
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return 1;
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}
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/*
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* Return the FILE stream for a given input, or NULL if none can be
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* found. NULL may also be returned if the input has not previously been
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* assigned.
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*/
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FILE *
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option_get_input(int source)
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{
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switch (source) {
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case 1: return input1;
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case 2: return input2;
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}
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return NULL;
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}
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/*
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* Set the given input source to a given FILE stream. If the input
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* source is invalid, then nothing is done.
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*/
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void
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option_set_input(int source, FILE *stream)
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{
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switch (source) {
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case 1: input1 = stream;
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case 2: input2 = stream;
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}
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}
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/*
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* Print out a help message. You'll note this is not automatically
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* generated; it must be manually updated as we add other options.
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*/
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void
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option_print_help()
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{
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fprintf(stderr, "Usage: erc [options...]\n");
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fprintf(stderr, "Options:\n");
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fprintf(stderr, "\
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--disassemble Print assembly notation from CPU memory\n\
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--disk1=FILE Load FILE into disk drive 1\n\
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--disk2=FILE Load FILE into disk drive 2\n\
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--flash Flash CPU memory with contents of drive 1\n\
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--help Print this help message\n\
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--size=WIDTHxHEIGHT Use WIDTH and HEIGHT for window size\n\
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(only 700x480 and 875x600 are supported)\n");
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}
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/*
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* Set the size of our window in visible width and height. The size
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* string is expected to be in the form of WIDTHxHEIGHT, where WIDTH
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* and HEIGHT are integers representing the window width and height
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* respectively. Arbitrary values for width and height are not
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* necessarily allowed; generally, we can only support values which
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* respect the aspect ratio used by the machine we are emulating.
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*/
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int
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option_set_size(const char *size)
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{
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if (strcmp(size, "700x480") == 0) {
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return OK;
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} else if (strcmp(size, "875x600") == 0) {
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width = 875;
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height = 600;
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return OK;
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}
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snprintf(error_buffer, ERRBUF_SIZE, "Ignoring bad window size: %s", size);
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return ERR_BADOPT;
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}
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/*
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* Return the window width we've been configured to use.
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*/
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int
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option_get_width()
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{
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return width;
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}
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/*
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* Return the window height we want.
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*/
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int
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option_get_height()
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{
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return height;
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}
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/*
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* Return true if the given option flag is set.
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*/
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bool
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option_flag(int flag)
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{
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return flags & flag;
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}
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