BSD 4_3 release

[unix-history] / usr / src / ucb / colrm.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)colrm.c     5.1 (Berkeley) 5/31/85";
#endif not lint

#include <stdio.h>
/*
COLRM removes unwanted columns from a file
       Jeff Schriebman  UC Berkeley 11-74
*/


main(argc,argv)
char **argv;
{
       register c, ct, first, last;

       first = 0;
       last = 0;
       if (argc > 1)
               first = getn(*++argv);
       if (argc > 2)
               last = getn(*++argv);

start:
       ct = 0;
loop1:
       c = getc(stdin);
       if (feof(stdin))
               goto fin;
       if (c == '\t')
               ct = (ct + 8) & ~7;
       else if (c == '\b')
               ct = ct ? ct - 1 : 0;
       else
               ct++;
       if (c == '\n') {
               putc(c, stdout);
               goto start;
       }
       if (!first || ct < first) {
               putc(c, stdout);
               goto loop1;
       }

/* Loop getting rid of characters */
       while (!last || ct < last) {
               c = getc(stdin);
               if (feof(stdin))
                       goto fin;
               if (c == '\n') {
                       putc(c, stdout);
                       goto start;
               }
               if (c == '\t')
                       ct = (ct + 8) & ~7;
               else if (c == '\b')
                       ct = ct ? ct - 1 : 0;
               else
                       ct++;
       }

/* Output last of the line */
       for (;;) {
               c = getc(stdin);
               if (feof(stdin))
                       break;
               putc(c, stdout);
               if (c == '\n')
                       goto start;
       }
fin:
       fflush(stdout);
}

getn(ap)
char *ap;
{
       register int n,c;
       register char *p;

       p = ap;
       n = 0;
       while ((c = *p++) >= '0' && c <= '9')
               n = n*10 + c - '0';
       return(n);
}