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Annotation of 43BSDReno/usr.bin/colrm/colrm.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: char copyright[] =
                     22: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
                     23:  All rights reserved.\n";
                     24: #endif /* not lint */
                     25: 
                     26: #ifndef lint
                     27: static char sccsid[] = "@(#)colrm.c    5.4 (Berkeley) 6/1/90";
                     28: #endif /* not lint */
                     29: 
                     30: #include <stdio.h>
                     31: /*
                     32: COLRM removes unwanted columns from a file
                     33:        Jeff Schriebman  UC Berkeley 11-74
                     34: */
                     35: 
                     36: 
                     37: main(argc,argv)
                     38: char **argv;
                     39: {
                     40:        register c, ct, first, last;
                     41: 
                     42:        first = 0;
                     43:        last = 0;
                     44:        if (argc > 1)
                     45:                first = getn(*++argv);
                     46:        if (argc > 2)
                     47:                last = getn(*++argv);
                     48: 
                     49: start:
                     50:        ct = 0;
                     51: loop1:
                     52:        c = getc(stdin);
                     53:        if (feof(stdin))
                     54:                goto fin;
                     55:        if (c == '\t')
                     56:                ct = (ct + 8) & ~7;
                     57:        else if (c == '\b')
                     58:                ct = ct ? ct - 1 : 0;
                     59:        else
                     60:                ct++;
                     61:        if (c == '\n') {
                     62:                putc(c, stdout);
                     63:                goto start;
                     64:        }
                     65:        if (!first || ct < first) {
                     66:                putc(c, stdout);
                     67:                goto loop1;
                     68:        }
                     69: 
                     70: /* Loop getting rid of characters */
                     71:        while (!last || ct < last) {
                     72:                c = getc(stdin);
                     73:                if (feof(stdin))
                     74:                        goto fin;
                     75:                if (c == '\n') {
                     76:                        putc(c, stdout);
                     77:                        goto start;
                     78:                }
                     79:                if (c == '\t')
                     80:                        ct = (ct + 8) & ~7;
                     81:                else if (c == '\b')
                     82:                        ct = ct ? ct - 1 : 0;
                     83:                else
                     84:                        ct++;
                     85:        }
                     86: 
                     87: /* Output last of the line */
                     88:        for (;;) {
                     89:                c = getc(stdin);
                     90:                if (feof(stdin))
                     91:                        break;
                     92:                putc(c, stdout);
                     93:                if (c == '\n')
                     94:                        goto start;
                     95:        }
                     96: fin:
                     97:        fflush(stdout);
                     98:        exit(0);
                     99: }
                    100: 
                    101: getn(ap)
                    102: char *ap;
                    103: {
                    104:        register int n,c;
                    105:        register char *p;
                    106: 
                    107:        p = ap;
                    108:        n = 0;
                    109:        while ((c = *p++) >= '0' && c <= '9')
                    110:                n = n*10 + c - '0';
                    111:        return(n);
                    112: }

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