# HG changeset patch
# User lost
# Date 1230876460 0
# Node ID 99e3b3310bacd5040610bb604a62c80518c51142
# Parent  39d750ee8d34f3be671a6904df9e7e7c5ac2de29
Added missing parse.c file to repository

diff -r 39d750ee8d34 -r 99e3b3310bac src/parse.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/parse.c	Fri Jan 02 06:07:40 2009 +0000
@@ -0,0 +1,94 @@
+/*
+parse.c
+Copyright © 2008 William Astle
+
+This file is part of LWASM.
+
+LWASM is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+more details.
+
+You should have received a copy of the GNU General Public License along with
+this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+Contains the general parser
+*/
+
+#define __parse_c_seen__
+
+#include <ctype.h>
+#include <string.h>
+
+#include "lwasm.h"
+#include "instab.h"
+#include "util.h"
+
+// parse a line and despatch to the appropriate handlers for opcodes
+int lwasm_parse_line(asmstate_t *as, lwasm_line_t *l)
+{
+	char *p, *p2;
+	char *opc;
+	int opnum;
+	
+	p = l -> text;
+	
+	if (!*p)
+		return 0;
+	
+	if (!isspace(*p) && *p != '*' && *p != ';')
+	{
+		// we have a symbol specified here
+		// parse it and define
+		// need to handle local symbols here...
+	}
+
+	// skip white space
+	while (*p && isspace(*p))
+		p++;
+	
+	// if comment or end of line, return
+	if (!*p || *p == '*' || *p == ';')
+		return 0;
+	
+	// parse the opcode
+	for (p2 = p; *p2 && !isspace(*p2); p2++)
+		/* do nothing */ ;
+	
+	opc = lwasm_alloc((p2 - p) + 1);
+	memcpy(opc, p, p2 - p);
+	opc[p2 - p] = '\0';
+
+	// skip intervening whitespace if present
+	while (*p2 && isspace(*p2))
+		p2++;
+
+	// check for macro (pass 1)
+	
+	// look up instruction in insn table
+	for (opnum = 0; instab[opnum].opcode; opnum++)
+	{
+		if (!strcasecmp(instab[opnum].opcode, opc))
+			break;
+	}
+	
+	if (!(instab[opnum].opcode) || !(instab[opnum].fn))
+	{
+		// invalid operation code, throw error
+		register_error(as, l, 1, "Invalid operation code '%s'", opc);
+		lwasm_free(opc);
+		return -1;
+	}
+
+	// dispatch handler
+	(instab[opnum].fn)(as, l, &p2, opnum);
+	
+	lwasm_free(opc);
+}