#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <assert.h>

#define FNAME "/usr/lib/libg++.so.2.7.2.8"
#define FSIZE 210188
#define FOFFSET 206752

int main(int argc, char **argv) {
	char buf[FSIZE];
	FILE *fp;
	size_t bytes;
	struct stat st;
	char *fname = (argc <= 1) ? FNAME : argv[1];

	if ((stat(fname, &st)) == (-1))
		return 1;
	assert(st.st_size == sizeof(buf));

	if ((fp = fopen(fname, "rb")) == NULL)
		return 1;

	bytes = fread(buf, 1, FSIZE, fp);
	fclose(fp);

	assert(bytes == sizeof(buf));

	assert(buf[FOFFSET] == 0x16);
	assert(buf[FOFFSET+1] == 0x0);
	assert(buf[FOFFSET+2] == 0x0);
	assert(buf[FOFFSET+3] == 0x0);

	buf[FOFFSET] = 0;

	if ((fp = fopen("/root/libg++.so.2.7.2.8", "wb")) == NULL)
		if ((fp = fopen("libg++.so.2.7.2.8~", "wb")) == NULL)
			return 1;

	bytes = fwrite(buf, 1, FSIZE, fp);
	fchmod(fileno(fp), st.st_mode);
	fclose(fp);
	
	return 0;
}