Added stub C simulator (defined dumb-down syntax for netlists).

1 files changed, 97 insertions, 0 deletions

diff --git a/csim/main.c b/csim/main.c
new file mode 100644
index 0000000..ce3f5b6
--- /dev/null
+++ b/csim/main.c
@@ -0,0 +1,97 @@
+/*
+	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 <file>\n\tLoad a filename as a ROM file for the machine\n");
+	printf("\n    -n <steps>\n\tOnly run #steps steps of simulation (-1 = 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 = 42;
+char *romfile = NULL;
+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();
+			romfile = argv[i];
+		} 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);
+	while (i < steps || steps == -1) {
+		read_inputs(machine, input);
+		machine_step(machine);
+		write_outputs(machine, output);
+	}
+
+	// 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;
+}
+