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/*
Système Digital
2013-2014
Alex AUVOLAT
main.c Main file for the C simulator
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "sim.h"
void usage() {
printf ("\nUsage:\n\tcsim [options] <netlist_file>\n\n");
printf("Available options:\n");
printf("\n -rom <prefix> <file>\n\tLoad a filename as a ROM file for the machine\n");
printf("\tA given ROM file is used for all ROM chips with variable name having given prefix\n");
printf("\n -n <steps>\n\tOnly run #steps steps of simulation (0 = infinity)\n");
printf("\n -in <in-file>\n\tRead inputs from given file (eg. named pipe). Defaults to STDIN.\n");
printf("\n -out <out-file>\n\tWrite outputs to given file (eg. named pipe). Defaults to STDOut.\n");
exit(1);
}
// Arguments to be parsed
int steps = 12;
char *filename = NULL;
char *infile = NULL;
char *outfile = NULL;
int main(int argc, char **argv) {
int i;
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "-rom")) {
if (++i == argc) usage();
if (++i == argc) usage();
FILE *rom = fopen(argv[i], "r");
if (!rom) {
fprintf(stderr, "Could not open ROM file: '%s'\n", argv[i]);
return 1;
}
add_rom(argv[i-1], rom);
fclose(rom);
} else if (!strcmp(argv[i], "-n")) {
if (++i == argc) usage();
steps = atoi(argv[i]);
} else if (!strcmp(argv[i], "-in")) {
if (++i == argc) usage();
infile = argv[i];
} else if (!strcmp(argv[i], "-out")) {
if (++i == argc) usage();
outfile = argv[i];
} else {
filename = argv[i];
}
}
if (filename == NULL) usage();
// Load program
FILE *p_in;
p_in = fopen(filename, "r");
if (!p_in) {
fprintf(stderr, "Error: could not open file %s for input.\n", filename);
return 1;
}
t_program* program = load_dumb_netlist(p_in);
fclose(p_in);
// Setup input and outputs
FILE *input = stdin, *output = stdout;
if (infile != NULL) {
input = fopen(infile, "r");
if (!infile) {
fprintf(stderr, "Error: could not open file %s for input.\n", infile);
return 1;
}
}
if (outfile != NULL) {
output = fopen(outfile, "w");
if (!output) {
fprintf(stderr, "Error: could not open file %s for output.\n", outfile);
return 1;
}
}
// Run
t_machine *machine = init_machine(program);
i = 0;
while (i < steps || steps == 0) {
read_inputs(machine, input);
machine_step(machine);
write_outputs(machine, output);
i++;
}
// Cleanup
if (input != stdin) fclose(input);
if (output != stdout) fclose(output);
// No need to free memory, the OS deletes everything anyways when the process ends.
return 0;
}
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