view lwar/replace.c @ 516:c33b4abff860

Fix bug related to parsing \x sequences under pragma cstrings Fix the test for lower case letter digits to test for the full range of hex digit values instead of just 0 to 9 when deciding to apply the correction factor for lower case.
author William Astle <lost@l-w.ca>
date Thu, 11 Feb 2021 09:25:16 -0700
parents 6df8d62302e2
children
line wrap: on
line source

/*
replace.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>

#ifdef _MSC_VER
#include <lw_win.h>	// windows build
#else
#include <unistd.h>
#endif

#include "lwar.h"

void do_replace(void)
{
	FILE *f;
	FILE *nf;
	unsigned char buf[8];
	char *filename;
	long l;
	int c;
	FILE *f2;
	int i;
	char fnbuf[1024];
	char fnbuf2[1024];
		
	sprintf(fnbuf, "%s.tmp", archive_file);
	
	f = fopen(archive_file, "rb+");
	if (!f)
	{
		if (errno == ENOENT)
		{
			nf = fopen(fnbuf, "wb");
			if (nf)
			{
				fputs("LWAR1V", nf);
				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);
	}

	nf = fopen(fnbuf, "wb");
	if (!nf)
	{
		perror("Cannot create temp archive file");
		exit(1);
	}

	fputs("LWAR1V", nf);

	for (;;)
	{
		c = fgetc(f);
		if (c == EOF && ferror(f))
		{
			perror("Reading archive file");
			exit(1);
		}
		if (c == EOF)
			goto doadd;
		
		if (!c)
		{
			goto doadd;
		}
		
		// find the end of the file name
		i = 0;
		while (c)
		{
			fnbuf2[i++] = c;
			c = fgetc(f);
			if (c == EOF || ferror(f))
			{
				fprintf(stderr, "Bad archive file\n");
				exit(1);
			}
		}
		fnbuf2[i] = 0;
		filename = get_file_name(fnbuf2);
		
		// 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;
		
		// is it a file we are replacing? if so, do not copy it
		for (i = 0; i < nfiles; i++)
		{
			if (!strcmp(get_file_name(files[i]), filename))
				break;
		}
		if (i < nfiles)
		{
			fseek(f, l, SEEK_CUR);
		}
		else
		{
			// otherwise, copy it
			fprintf(nf, "%s", filename);
			fputc(0, nf);
			fputc(l >> 24, nf);
			fputc((l >> 16) & 0xff, nf);
			fputc((l >> 8) & 0xff, nf);
			fputc(l & 0xff, nf);
			while (l)
			{
				c = fgetc(f);
				fputc(c, nf);
				l--;
			}
		}
	}
	
	// done with the original file
	fclose(f);
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, nf);
					c = fgetc(f2);
					if (c == EOF || ferror(f))
					{
						fprintf(stderr, "Bad input archive file\n");
						exit(1);
					}
				}
				fputc(0, nf);
				
				// get length of archive member
				l = 0;
				c = fgetc(f2);
				fputc(c, nf);
				l = c << 24;
				c = fgetc(f2);
				fputc(c, nf);
				l |= c << 16;
				c = fgetc(f2);
				fputc(c, nf);
				l |= c << 8;
				c = fgetc(f2);
				fputc(c, nf);
				l |= c;
		
				while (l)
				{
					c = fgetc(f2);
					fputc(c, nf);
					l--;
				}
			}
			
			fclose(f2);
			continue;
		}
		fseek(f2, 0, SEEK_END);
		l = ftell(f2);
		fseek(f2, 0, SEEK_SET);
		fputs(get_file_name(files[i]), nf);
		fputc(0, nf);
		fputc(l >> 24, nf);
		fputc((l >> 16) & 0xff, nf);
		fputc((l >> 8) & 0xff, nf);
		fputc(l & 0xff, nf);
		while (l)
		{
			c = fgetc(f2);
			fputc(c, nf);
			l--;
		}
	}
	
	// flag end of file
	fputc(0, nf);
	
	fclose(nf);
	
	if (rename(fnbuf, archive_file) < 0)
	{
		perror("Cannot replace old archive file");
		unlink(fnbuf);
	}
}