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Annotation of 43BSDTahoe/ucb/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 the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #ifndef lint
                     19: char copyright[] =
                     20: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
                     21:  All rights reserved.\n";
                     22: #endif /* not lint */
                     23: 
                     24: #ifndef lint
                     25: static char sccsid[] = "@(#)colrm.c    5.3 (Berkeley) 6/29/88";
                     26: #endif /* not lint */
                     27: 
                     28: #include <stdio.h>
                     29: /*
                     30: COLRM removes unwanted columns from a file
                     31:        Jeff Schriebman  UC Berkeley 11-74
                     32: */
                     33: 
                     34: 
                     35: main(argc,argv)
                     36: char **argv;
                     37: {
                     38:        register c, ct, first, last;
                     39: 
                     40:        first = 0;
                     41:        last = 0;
                     42:        if (argc > 1)
                     43:                first = getn(*++argv);
                     44:        if (argc > 2)
                     45:                last = getn(*++argv);
                     46: 
                     47: start:
                     48:        ct = 0;
                     49: loop1:
                     50:        c = getc(stdin);
                     51:        if (feof(stdin))
                     52:                goto fin;
                     53:        if (c == '\t')
                     54:                ct = (ct + 8) & ~7;
                     55:        else if (c == '\b')
                     56:                ct = ct ? ct - 1 : 0;
                     57:        else
                     58:                ct++;
                     59:        if (c == '\n') {
                     60:                putc(c, stdout);
                     61:                goto start;
                     62:        }
                     63:        if (!first || ct < first) {
                     64:                putc(c, stdout);
                     65:                goto loop1;
                     66:        }
                     67: 
                     68: /* Loop getting rid of characters */
                     69:        while (!last || ct < last) {
                     70:                c = getc(stdin);
                     71:                if (feof(stdin))
                     72:                        goto fin;
                     73:                if (c == '\n') {
                     74:                        putc(c, stdout);
                     75:                        goto start;
                     76:                }
                     77:                if (c == '\t')
                     78:                        ct = (ct + 8) & ~7;
                     79:                else if (c == '\b')
                     80:                        ct = ct ? ct - 1 : 0;
                     81:                else
                     82:                        ct++;
                     83:        }
                     84: 
                     85: /* Output last of the line */
                     86:        for (;;) {
                     87:                c = getc(stdin);
                     88:                if (feof(stdin))
                     89:                        break;
                     90:                putc(c, stdout);
                     91:                if (c == '\n')
                     92:                        goto start;
                     93:        }
                     94: fin:
                     95:        fflush(stdout);
                     96:        exit(0);
                     97: }
                     98: 
                     99: getn(ap)
                    100: char *ap;
                    101: {
                    102:        register int n,c;
                    103:        register char *p;
                    104: 
                    105:        p = ap;
                    106:        n = 0;
                    107:        while ((c = *p++) >= '0' && c <= '9')
                    108:                n = n*10 + c - '0';
                    109:        return(n);
                    110: }

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