view lwar/add.c @ 265:6f4c4d59666f

Make lwar use the "b" flag when opening files. Due to the dumbness on Windows systems related to text vs. binary file distinctions, one needs to add 'b' to fopen() calls when dealing with binary files.
author William Astle <lost@l-w.ca>
date Sun, 10 Feb 2013 19:22:24 -0700
parents 346966cffeef
children 45df37e81741
line wrap: on
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/*
add.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/>.


Implements the program startup code

*/

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

#include "lwar.h"

void do_add(void)
{
	FILE *f;
	unsigned char buf[8];
	long l;
	int c;
	FILE *f2;
	int i;
	
	f = fopen(archive_file, "rb+");
	if (!f)
	{
		if (errno == ENOENT)
		{
			f = fopen(archive_file, "wb");
			if (f)
			{
				fputs("LWAR1V", f);
				goto doadd;
			}
		}
		perror("Cannot open archive file");
	}
	
	(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 (c == EOF && ferror(f))
		{
			perror("Reading archive file");
			exit(1);
		}
		if (c == EOF)
			goto doadd;
		
		if (!c)
		{
			fseek(f, -1, SEEK_CUR);
			goto doadd;
		}
		
		// find the end of the file name
		while (c)
		{
			c = fgetc(f);
			if (c == EOF || ferror(f))
			{
				fprintf(stderr, "Bad archive file\n");
				exit(1);
			}
		}
		
		// 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;
		
		fseek(f, l, SEEK_CUR);
	}
	// back up to the NUL byte at the end of the file
	fseek(f, -1, SEEK_CUR);
doadd:
	for (i = 0; i < nfiles; i++)
	{
		f2 = fopen(files[i], "rb");
		if (!f2)
		{
			fprintf(stderr, "Cannot open file %s:", files[i]);
			perror("");
			exit(1);
		}
		(void)(fread(buf, 1, 6, f2) && 1);
		if (mergeflag && !memcmp("LWAR1V", buf, 6))
		{
			// add archive contents...
			for (;;)
			{
				c = fgetc(f2);
				if (c == EOF || ferror(f2))
				{
					perror("Reading input archive file");
					exit(1);
				}
				if (c == EOF)
					break;
		
				if (!c)
				{
					break;
				}
		
				// find the end of the file name
				while (c)
				{
					fputc(c, f);
					c = fgetc(f2);
					if (c == EOF || ferror(f))
					{
						fprintf(stderr, "Bad input archive file\n");
						exit(1);
					}
				}
				fputc(0, f);
				
				// get length of archive member
				l = 0;
				c = fgetc(f2);
				fputc(c, f);
				l = c << 24;
				c = fgetc(f2);
				fputc(c, f);
				l |= c << 16;
				c = fgetc(f2);
				fputc(c, f);
				l |= c << 8;
				c = fgetc(f2);
				fputc(c, f);
				l |= c;
		
				while (l)
				{
					c = fgetc(f2);
					fputc(c, f);
					l--;
				}
			}
			
			fclose(f2);
			continue;
		}
		fseek(f2, 0, SEEK_END);
		l = ftell(f2);
		fseek(f2, 0, SEEK_SET);
		fputs(files[i], f);
		fputc(0, f);
		fputc(l >> 24, f);
		fputc((l >> 16) & 0xff, f);
		fputc((l >> 8) & 0xff, f);
		fputc(l & 0xff, f);
		while (l)
		{
			c = fgetc(f2);
			fputc(c, f);
			l--;
		}
	}
	
	// flag end of file
	fputc(0, f);	
}