BSD 4 release

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

static  char *Sccsid = "@(#)colrm.c     4.2 (Berkeley) 10/9/80";
#include <stdio.h>
/*
COLRM removes unwanted columns from a file
       Jeff Schriebman  UC Berkeley 11-74
*/


main(argc,argv)
char **argv;
{
       int first;
       register ct,last;
       register char c;
       char buffer[BUFSIZ];

       setbuf(stdout, buffer);
       first = 20000;
       last  = -1;
       if (argc>1) {
               first = getn(*++argv);
               last = 20000;
       }
       if (argc>2)
               last = getn(*++argv);

start:
       ct = 0;
loop1:
       if ((c=getc(stdin))<0)
               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 (ct<first) {
               putc(c,stdout);
               goto loop1;
       }

/* Loop getting rid of characters */
       for (;ct<last;ct++) {
               if ((c=getc(stdin))<0)
                       goto fin;
               if (c=='\n') {
                       putc(c,stdout);
                       goto start;
               }
       }

/* Output last of the line */
       while ((c=getc(stdin))>0) {
               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);
}