--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main.c	Fri Oct 03 02:44:20 2008 +0000
@@ -0,0 +1,140 @@
+/*
+main.c
+
+Implements the program startup code
+
+*/
+
+#include <argp.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "lwasm.h"
+
+// external declarations
+extern void resolve_phasing(asmstate_t *as);
+extern void generate_code(asmstate_t *as);
+extern void list_code(asmstate_t *as);
+extern void write_code(asmstate_t *as);
+
+
+// command line option handling
+const char *argp_program_version = "LWASM Version 0.0";
+const char *argp_program_bug_address = "lost@l-w.ca";
+
+static error_t parse_opts(int key, char *arg, struct argp_state *state)
+{
+	asmstate_t *as = state -> input;
+	
+	switch (key)
+	{
+	case 'o':
+		// output
+		if (as -> outfile)
+		{
+		}
+		as -> outfile = arg;
+		break;
+	
+	case 'd':
+		// debug
+		as -> debug++;
+		break;
+	
+	case 'l':
+		// list
+		if (arg)
+			as -> listfile = arg;
+		else
+			as -> listfile = "-";
+		break;
+	
+	case 'b':
+		// decb output
+		as -> outformat = OUTPUT_DECB;
+		break;
+	
+	case 'r':
+		// raw binary output
+		as -> outformat = OUTPUT_RAW;
+		break;
+		
+	case ARGP_KEY_END:
+		// done; sanity check
+		if (!as -> outfile)
+			as -> outfile = "a.out";
+		break;
+	
+	case ARGP_KEY_ARG:
+		// non-option arg
+		if (as -> infile)
+			argp_usage(state);
+		as -> infile = arg;
+		break;
+		
+	default:
+		return ARGP_ERR_UNKNOWN;
+	}
+	return 0;
+}
+
+static struct argp_option options[] =
+{
+	{ "output",		'o',	"FILE",	0,
+				"Output to FILE"},
+	{ "debug",		'd',	0,		0,
+				"Set debug mode"},
+	{ "list",		'l',	"FILE",	OPTION_ARG_OPTIONAL,
+				"Generate list [to FILE]"},
+	{ "decb",		'b',	0,		0,
+				"Generate DECB .bin format output"},
+	{ "raw",		'r',	0,		0,
+				"Generate raw binary format output"},
+	{ "rawrel",		0,		0,		0,
+				"Generate raw binary respecing ORG statements as offsets from the start of the file"},
+	{ 0 }
+};
+
+static struct argp argp =
+{
+	options,
+	parse_opts,
+	"<input file>",
+	"LWASM, a HD6309 and MC6809 cross-assembler"
+};
+
+// main function; parse command line, set up assembler state, and run the
+// assembler on the first file
+int main(int argc, char **argv)
+{
+	// assembler state
+	asmstate_t asmstate = { 0 };
+
+	argp_parse(&argp, argc, argv, 0, 0, &asmstate);
+	if (!asmstate.listfile)
+		asmstate.listfile = "-";
+	
+//	printf("Assembling %s to %s; list to %s\n", asmstate.infile, asmstate.outfile, asmstate.listfile);
+
+	/* pass 1 - collect the symbols and assign addresses where possible */
+	/* pass 1 also resolves included files, etc. */
+	/* that means files are read exactly once unless included multiple times */
+	lwasm_read_file(&asmstate, (char *)(asmstate.infile));
+	
+	// pass 2: actually generate the code; if any phasing errors appear
+	// at this stage, we have a bug
+	generate_code(&asmstate);
+
+	// now make a pretty listing
+	list_code(&asmstate);
+
+	// now write the code out to the output file
+	write_code(&asmstate);
+
+	if (asmstate.errorcount > 0)
+		exit(1);
+
+	exit(0);
+}
+