#include <stdio.h>


#define	BLKSIZ	512


char	ibuf[BLKSIZ];
int	blksiz = BLKSIZ;


int	dbgflg = 0;			/* Debug; print entry and value */


int	main(argc, argv)
	int	argc;
	char	*argv[];

{			char	*arg;
			char	*ofnm;
	register	char	*cp;
	register	FILE	*out;
			int	blkno, nblks;


	if ((argc < 3) || (argc > 4)) {
		printf("\nmkempty {-d} <ofile> <nblks>\n");
		exit(1);
		}

	argv++;
	argc--;
	

	for (;;) {
		arg = *argv;
		if (*arg++ != '-')
			break;

		argv++;
		argc--;

		switch (*arg) {

		  case 'd':	dbgflg++;
				printf("\n");
				break;

		  default:	printf("Bad flag: %c", *arg);
				exit(1);
		  }
		}


	ofnm = *argv++;
	argc--;
	
	out = fopen(ofnm, "wb");
	if (out == NULL) {
		printf("Error opening output file: '%s'\n", ofnm);
		exit(1);
		}

	arg = *argv++;
	argc--;

	nblks = atoi(arg);
	if (nblks < 0) {
		printf("Bad file size: %d\n", nblks);
		exit(1);
		}


	if (argc > 0) {
		printf("Unneeded extra arg '%s'", *argv);
		exit(1);		
		}


	cp = &ibuf[0];
	while (cp < &ibuf[BLKSIZ])
		*cp++ = 0;

	for (blkno = 0; (blkno < nblks); blkno++) {
		if (fwrite(&ibuf[0], sizeof(char), blksiz, out) != blksiz) {
			printf("Write failed: block %d\n", blkno);
			exit(1);
			}
		}

	fclose(out);

	printf("%d blocks written", blkno);
}