run.c

MCS51系列单片机的汇编器

#include <stdio.h>
#include <setjmp.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>

#include "as31.h"



/* global variables */
unsigned long lc;
char *asmfile;
int fatal=0, abort_asap=0;
int pass=0;
int dashl=0;
FILE *listing=NULL, *fin=NULL;



int run_as31(const char *infile, int lst, int use_stdout,
	const char *fmt, const char *arg)
{
	char *outfile=NULL, *lstfile=NULL;
	const char *extension;
	int has_dot_asm=0;
	int len, baselen, extlen;

	/* first, figure out all the file names */

	dashl = lst;
	extension = emit_extension(fmt);
	extlen = strlen(extension);

	len = baselen = strlen(infile);
	if (len >= 4 && strcasecmp(infile + len - 4, ".asm") == 0) {
		has_dot_asm = 1;
		baselen -= 4;
	}
	
	asmfile = (char *)malloc(baselen + 5);
	strcpy(asmfile, infile);

	if (dashl) {
		lstfile = (char *)malloc(baselen + 5);
		strncpy(lstfile, infile, baselen);
		strcpy(lstfile + baselen, ".lst");
	}

	if (use_stdout) {
		outfile = NULL;
	} else {
		outfile = (char *)malloc(baselen + extlen + 2);
		strncpy(outfile, infile, baselen);
		*(outfile + baselen) = '.';
		strcpy(outfile + baselen + 1, extension);
	}

	/* now open the files */

	fin = freopen(asmfile, "r", stdin);
	if (fin == NULL) {
		if (!has_dot_asm) {
			strcpy(asmfile + baselen, ".asm");
			fin = freopen(asmfile, "r", stdin);
		}
		if (fin == NULL) {
			mesg_f("Cannot open input file: %s\n", asmfile);
			free(asmfile);
			if (outfile) free(outfile);
			if (lstfile) free(lstfile);
			return -1;
		}
	}

	if (dashl) {
		listing = fopen(lstfile,"w");
		if( listing == NULL ) {
			mesg_f("Cannot open file: %s for writing.\n",
				lstfile);
			fclose(fin);
			free(asmfile);
			if (outfile) free(outfile);
			if (lstfile) free(lstfile);
			return -1;
		}
	}

	/* what happens if this doesn't work */
	emitopen(outfile, fmt, arg);

	syminit();
	clear_location_counter();
	fatal = abort_asap = 0;
	lineno = 1;
	pass=0;
	lc = 0;

	/*
	** P A S S    1
	*/

	if (!use_stdout) mesg_f("Begin Pass #1\n");
	yyparse();
	if (fatal) {
		mesg_f("Errors in pass1, assembly aborted\n");
	} else {

		rewind(fin);
		lineno = 1;
		pass++;
		lc = 0;
		emitaddr(lc);

		/*
		** P A S S    2
		*/
        	if (!use_stdout) mesg_f("Begin Pass #2\n");
		yyparse();
	}
	if (fatal) {
		mesg_f("Errors in pass2, assembly aborted\n");
	}

	emitclose();
	fclose(fin);
	if (dashl) fclose(listing);
	free(asmfile);
	if (outfile) free(outfile);
	if (lstfile) free(lstfile);
	freesym();
	if (fatal) return -1;
	return 0;
}	


/* the parser, lexer and other stuff that actually do the */
/* assembly will call to these two functions to report any */
/* errors or warning.  error() calls exit() in the command */
/* line version, but the abort_asap flag was added, and the */
/* parser check it at the end of every line */

void error(const char *fmt, ...)
{
	va_list args;
	char buf[2048];
	int len;

	abort_asap++;
        fatal++;
	va_start(args, fmt);

	len = snprintf(buf, sizeof(buf), "Error, line %d, ", lineno);
	len += vsnprintf(buf + len, sizeof(buf) - len, fmt, args);
	snprintf(buf + len, sizeof(buf) - len, ".\n");
	mesg(buf);
}


void warn(const char *fmt, ...)
{
	va_list args;
	char buf[2048];
	int len;

        fatal++;
	va_start(args, fmt);

	len = snprintf(buf, sizeof(buf), "Warning, line %d, ", lineno);
	len += vsnprintf(buf + len, sizeof(buf) - len, fmt, args);
	snprintf(buf + len, sizeof(buf) - len, ".\n");
	mesg(buf);
}


void mesg_f(const char *fmt, ...)
{
	va_list args;
	char buf[2048];

	va_start(args, fmt);

	vsnprintf(buf, sizeof(buf), fmt, args);
	mesg(buf);
}