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Annotation of 43BSDReno/usr.bin/vis/foldit.c, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The 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: static char sccsid[] = "@(#)foldit.c   1.1 (Berkeley) 5/23/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: foldit(chunk, col, max)
        !            25:        char *chunk;
        !            26: {
        !            27:        register char *cp;
        !            28: 
        !            29:        /*
        !            30:         * Keep track of column position. Insert hidden newline
        !            31:         * if this chunk puts us over the limit.
        !            32:         */
        !            33: again:
        !            34:        cp = chunk;
        !            35:        while (*cp) {
        !            36:                switch(*cp) {
        !            37:                case '\n':
        !            38:                case '\r':
        !            39:                        col = 0;
        !            40:                        break;
        !            41:                case '\t':
        !            42:                        col = col + 8 &~ 07;
        !            43:                        break;
        !            44:                case '\b':
        !            45:                        col = col ? col - 1 : 0;
        !            46:                        break;
        !            47:                default:
        !            48:                        col++;
        !            49:                }
        !            50:                if (col > (max - 2)) {
        !            51:                        printf("\\\n");
        !            52:                        col = 0;
        !            53:                        goto again;
        !            54:                } 
        !            55:                cp++;
        !            56:        }
        !            57:        return (col);
        !            58: }

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