BSD 4 release

[unix-history] / usr / src / cmd / clri.c

static char *sccsid = "@(#)clri.c       4.1 (Berkeley) 10/1/80";
/*
* clri filsys inumber ...
*/

#include <sys/param.h>
#include <sys/ino.h>

#define ISIZE   (sizeof(struct dinode))
#define NI      (BSIZE/ISIZE)
struct  ino
{
       char    junk[ISIZE];
};
struct  ino     buf[NI];
int     status;

main(argc, argv)
char *argv[];
{
       register i, f;
       unsigned n;
       int j, k;
       long off;

       if(argc < 3) {
               printf("usage: clri filsys inumber ...\n");
               exit(4);
       }
       f = open(argv[1], 2);
       if(f < 0) {
               printf("cannot open %s\n", argv[1]);
               exit(4);
       }
       for(i=2; i<argc; i++) {
               if(!isnumber(argv[i])) {
                       printf("%s: is not a number\n", argv[i]);
                       status = 1;
                       continue;
               }
               n = atoi(argv[i]);
               if(n == 0) {
                       printf("%s: is zero\n", argv[i]);
                       status = 1;
                       continue;
               }
               off = itod(n) * BSIZE;
               lseek(f, off, 0);
               if(read(f, (char *)buf, BSIZE) != BSIZE) {
                       printf("%s: read error\n", argv[i]);
                       status = 1;
               }
       }
       if(status)
               exit(status);
       for(i=2; i<argc; i++) {
               n = atoi(argv[i]);
               printf("clearing %u\n", n);
               off = itod(n) * BSIZE;
               lseek(f, off, 0);
               read(f, (char *)buf, BSIZE);
               j = itoo(n);
               for(k=0; k<ISIZE; k++)
                       buf[j].junk[k] = 0;
               lseek(f, off, 0);
               write(f, (char *)buf, BSIZE);
       }
       exit(status);
}

isnumber(s)
char *s;
{
       register c;

       while(c = *s++)
               if(c < '0' || c > '9')
                       return(0);
       return(1);
}