386BSD 0.1 development

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

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#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     5.4 (Berkeley) 6/1/90";
#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);
       exit(0);
}

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);
}