1 /* Copyright (c) 1981 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)clri.c 1.3 01/12/82"; 4 5 /* static char *sccsid = "@(#)clri.c 4.1 (Berkeley) 10/1/80"; */ 6 /* 7 * clri filsys inumber ... 8 */ 9 10 #include "../h/param.h" 11 #include "../h/inode.h" 12 #include "../h/fs.h" 13 14 #define ISIZE (sizeof(struct dinode)) 15 #define NI (MAXBSIZE/ISIZE) 16 struct ino { 17 char junk[ISIZE]; 18 }; 19 struct ino buf[NI]; 20 21 union { 22 char dummy[SBSIZE]; 23 struct fs sblk; 24 } sb_un; 25 #define sblock sb_un.sblk 26 27 int status; 28 29 main(argc, argv) 30 int argc; 31 char *argv[]; 32 { 33 register i, f; 34 unsigned n; 35 int j, k; 36 long off; 37 38 if (argc < 3) { 39 printf("usage: clri filsys inumber ...\n"); 40 exit(4); 41 } 42 f = open(argv[1], 2); 43 if (f < 0) { 44 printf("cannot open %s\n", argv[1]); 45 exit(4); 46 } 47 lseek(f, SBLOCK * DEV_BSIZE, 0); 48 if (read(f, &sblock, SBSIZE) != SBSIZE) { 49 printf("cannot read %s\n", argv[1]); 50 exit(4); 51 } 52 for (i = 2; i < argc; i++) { 53 if (!isnumber(argv[i])) { 54 printf("%s: is not a number\n", argv[i]); 55 status = 1; 56 continue; 57 } 58 n = atoi(argv[i]); 59 if (n == 0) { 60 printf("%s: is zero\n", argv[i]); 61 status = 1; 62 continue; 63 } 64 off = fsbtodb(&sblock, itod(&sblock, n)) * DEV_BSIZE; 65 lseek(f, off, 0); 66 if (read(f, (char *)buf, sblock.fs_bsize) != sblock.fs_bsize) { 67 printf("%s: read error\n", argv[i]); 68 status = 1; 69 } 70 } 71 if (status) 72 exit(status); 73 for (i = 2; i < argc; i++) { 74 n = atoi(argv[i]); 75 printf("clearing %u\n", n); 76 off = fsbtodb(&sblock, itod(&sblock, n)) * DEV_BSIZE; 77 lseek(f, off, 0); 78 read(f, (char *)buf, sblock.fs_bsize); 79 j = itoo(&sblock, n); 80 for (k = 0; k < ISIZE; k++) 81 buf[j].junk[k] = 0; 82 lseek(f, off, 0); 83 write(f, (char *)buf, sblock.fs_bsize); 84 } 85 exit(status); 86 } 87 88 isnumber(s) 89 char *s; 90 { 91 register c; 92 93 while(c = *s++) 94 if (c < '0' || c > '9') 95 return(0); 96 return(1); 97 } 98