| 1 | static char *Sccsid = "@(#)colrm.c 4.3 (Berkeley) %G%"; |
| 2 | #include <stdio.h> |
| 3 | /* |
| 4 | COLRM removes unwanted columns from a file |
| 5 | Jeff Schriebman UC Berkeley 11-74 |
| 6 | */ |
| 7 | |
| 8 | |
| 9 | main(argc,argv) |
| 10 | char **argv; |
| 11 | { |
| 12 | int first; |
| 13 | register ct,last; |
| 14 | register char c; |
| 15 | char buffer[BUFSIZ]; |
| 16 | |
| 17 | setbuf(stdout, buffer); |
| 18 | first = 20000; |
| 19 | last = -1; |
| 20 | if (argc>1) { |
| 21 | first = getn(*++argv); |
| 22 | last = 20000; |
| 23 | } |
| 24 | if (argc>2) |
| 25 | last = getn(*++argv); |
| 26 | |
| 27 | start: |
| 28 | ct = 0; |
| 29 | loop1: |
| 30 | c = getc(stdin); |
| 31 | if (feof(stdin)) |
| 32 | goto fin; |
| 33 | if (c == '\t') |
| 34 | ct = (ct + 8) &~ 7; |
| 35 | else if (c == '\b') |
| 36 | ct = ct ? ct - 1 : 0; |
| 37 | else |
| 38 | ct++; |
| 39 | if (c=='\n') { |
| 40 | putc(c,stdout); |
| 41 | goto start; |
| 42 | } |
| 43 | if (ct<first) { |
| 44 | putc(c,stdout); |
| 45 | goto loop1; |
| 46 | } |
| 47 | |
| 48 | /* Loop getting rid of characters */ |
| 49 | for (;ct<last;ct++) { |
| 50 | c = getc(stdin); |
| 51 | if (feof(stdin)) |
| 52 | goto fin; |
| 53 | if (c=='\n') { |
| 54 | putc(c,stdout); |
| 55 | goto start; |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | /* Output last of the line */ |
| 60 | for (;;) { |
| 61 | c = getc(stdin); |
| 62 | if (feof(stdin)) |
| 63 | break; |
| 64 | putc(c,stdout); |
| 65 | if (c=='\n') |
| 66 | goto start; |
| 67 | } |
| 68 | fin: |
| 69 | fflush(stdout); |
| 70 | } |
| 71 | |
| 72 | getn(ap) |
| 73 | char *ap; |
| 74 | { |
| 75 | register int n,c; |
| 76 | register char *p; |
| 77 | |
| 78 | p = ap; |
| 79 | n = 0; |
| 80 | while ((c = *p++) >= '0' && c <= '9') |
| 81 | n = n*10 + c - '0'; |
| 82 | return(n); |
| 83 | } |