PWB1/sys/source/s8/labelit.c

#include "stdio.h"
#include "filsys.h"
#define DEV 1
#define FSNAME 2
#define VOLUME 3
 /* write fsname, volume # on disk superblock */
struct {
	char fill1[512];
	struct filsys fs;
	char fill2[5120-1024];
} super;

main(argc, argv) char **argv; {
int fsi, fso;
long curtime;
int i;

	if(argc!=4 && argc!=2 && argc!=5)  {
showusage:
		fprintf(stderr,"Usage: labelit /dev/r??? [fsname volume [-n]]\n");
		exit(1);
	}
	if(argc==5) {
		if(strcmp(argv[4], "-n")!=0)
			goto showusage;
		printf("Skipping label check!\n");
		goto do_it;
	}

	if((fsi = open(argv[DEV],0)) < 1)
		fprintf(stderr, "Cannot open device\n");

	if((i=read(fsi, &super, 5120)) != 5120)  {
		fprintf(stderr, "Cannot read 5120 char block.\n");
	}

	printf("Current fsname: %.6s, Current volname: %.6s\n",
		super.fs.s_fname,super.fs.s_fpack);
	printf("Date last mounted: %s", ctime(&super.fs.s_time));
	if(argc==2)
		exit(0);
do_it:
	printf("NEW fsname = %.6s, NEW volname = %.6s -- DEL if wrong!!\n",
		argv[FSNAME], argv[VOLUME]);
	sleep(10);
	sprintf(super.fs.s_fname, "%.6s", argv[FSNAME]);
	sprintf(super.fs.s_fpack, "%.6s", argv[VOLUME]);

	close(fsi);
	fso = open(argv[DEV],1);
	if(write(fso, &super, 5120) < 0) {
		fprintf(stderr, "Cannot write label\n");
		exit(1);
	}
	exit(0);
}