| 1 | /* |
| 2 | * clri filsys inumber ... |
| 3 | */ |
| 4 | |
| 5 | #include <sys/types.h> |
| 6 | #include <sys/ino.h> |
| 7 | #define ISIZE (sizeof(struct dinode)) |
| 8 | #define BSIZE 512 |
| 9 | #define NI (BSIZE/ISIZE) |
| 10 | struct ino |
| 11 | { |
| 12 | char junk[ISIZE]; |
| 13 | }; |
| 14 | struct ino buf[NI]; |
| 15 | int status; |
| 16 | |
| 17 | main(argc, argv) |
| 18 | char *argv[]; |
| 19 | { |
| 20 | register i, f; |
| 21 | unsigned n; |
| 22 | int j, k; |
| 23 | long off; |
| 24 | |
| 25 | if(argc < 3) { |
| 26 | printf("usage: clri filsys inumber ...\n"); |
| 27 | exit(4); |
| 28 | } |
| 29 | f = open(argv[1], 2); |
| 30 | if(f < 0) { |
| 31 | printf("cannot open %s\n", argv[1]); |
| 32 | exit(4); |
| 33 | } |
| 34 | for(i=2; i<argc; i++) { |
| 35 | if(!isnumber(argv[i])) { |
| 36 | printf("%s: is not a number\n", argv[i]); |
| 37 | status = 1; |
| 38 | continue; |
| 39 | } |
| 40 | n = atoi(argv[i]); |
| 41 | if(n == 0) { |
| 42 | printf("%s: is zero\n", argv[i]); |
| 43 | status = 1; |
| 44 | continue; |
| 45 | } |
| 46 | off = ((n-1)/NI + 2) * (long)512; |
| 47 | lseek(f, off, 0); |
| 48 | if(read(f, (char *)buf, BSIZE) != BSIZE) { |
| 49 | printf("%s: read error\n", argv[i]); |
| 50 | status = 1; |
| 51 | } |
| 52 | } |
| 53 | if(status) |
| 54 | exit(status); |
| 55 | for(i=2; i<argc; i++) { |
| 56 | n = atoi(argv[i]); |
| 57 | printf("clearing %u\n", n); |
| 58 | off = ((n-1)/NI + 2) * (long)512; |
| 59 | lseek(f, off, 0); |
| 60 | read(f, (char *)buf, BSIZE); |
| 61 | j = (n-1)%NI; |
| 62 | for(k=0; k<ISIZE; k++) |
| 63 | buf[j].junk[k] = 0; |
| 64 | lseek(f, off, 0); |
| 65 | write(f, (char *)buf, BSIZE); |
| 66 | } |
| 67 | exit(status); |
| 68 | } |
| 69 | |
| 70 | isnumber(s) |
| 71 | char *s; |
| 72 | { |
| 73 | register c; |
| 74 | |
| 75 | while(c = *s++) |
| 76 | if(c < '0' || c > '9') |
| 77 | return(0); |
| 78 | return(1); |
| 79 | } |