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