view lwar/extract.c @ 406:4411a6123716

Add "basic" output format Add "basic" output format. This outputs the code in the form of a Basic program that installs the assembled output. If an execution address is provided to the END pseudo operation, it will transfer control there using the Basic EXEC command. Thanks to Tim Lindner <tlindner@macmess.org> for the original patch. I used it mostly as is except for a couple of minor fixes for coding style and removing a variable declaration from inside a for() statement for portability reasons.
author William Astle <lost@l-w.ca>
date Thu, 03 Mar 2016 21:04:39 -0700
parents 6f4c4d59666f
children 45df37e81741
line wrap: on
line source

/*
extract.c
Copyright © 2009 William Astle

This file is part of LWAR.

LWAR 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/>.

*/

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "lwar.h"

void do_extract(void)
{
	FILE *f;
	char buf[8];
	long l;
	int c;
	char fnbuf[1024];
	int i;
	FILE *nf;
	
	f = fopen(archive_file, "rb");
	if (!f)
	{
		perror("Opening archive file");
		exit(1);
	}
	
	(void)(fread(buf, 1, 6, f) && 1);
	if (memcmp("LWAR1V", buf, 6))
	{
		fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
		exit(1);
	}

	for (;;)
	{
		c = fgetc(f);
		if (ferror(f))
		{
			perror("Reading archive file");
			exit(1);
		}
		if (c == EOF)
			return;
		
		
		// find the end of the file name
		if (!c)
			return;
		
		i = 0;
		while (c)
		{
			fnbuf[i++] = c;
			c = fgetc(f);
			if (c == EOF || ferror(f))
			{
				fprintf(stderr, "Bad archive file\n");
				exit(1);
			}
		}
		fnbuf[i] = 0;
		
		// get length of archive member
		l = 0;
		c = fgetc(f);
		l = c << 24;
		c = fgetc(f);
		l |= c << 16;
		c = fgetc(f);
		l |= c << 8;
		c = fgetc(f);
		l |= c;
		
		for (i = 0; i < nfiles; i++)
		{
			if (!strcmp(files[i], fnbuf))
				break;
		}
		if (i < nfiles || nfiles == 0)
		{
			// extract the file
			nf = fopen(fnbuf, "wb");
			if (!nf)
			{
				fprintf(stderr, "Cannot extract '%s': %s\n", fnbuf, strerror(errno));
				exit(1);
			}
			while (l)
			{
				c = fgetc(f);
				fputc(c, nf);
				l--;
			}
			fclose(nf);
		}
		else
		{
			// skip the file
			fseek(f, l, SEEK_CUR);
		}
	}
}