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Annotation of src/usr.bin/vis/foldit.c, Revision 1.3

1.3     ! mpech       1: /*     $OpenBSD: foldit.c,v 1.2 1996/06/26 05:42:37 deraadt Exp $      */
1.1       deraadt     2: /*     $NetBSD: foldit.c,v 1.4 1994/12/20 16:13:02 jtc Exp $   */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1990, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  */
                     36:
                     37: #ifndef lint
                     38: #if 0
                     39: static char sccsid[] = "@(#)foldit.c   8.1 (Berkeley) 6/6/93";
                     40: #endif
1.3     ! mpech      41: static char rcsid[] = "$OpenBSD: foldit.c,v 1.2 1996/06/26 05:42:37 deraadt Exp $";
1.1       deraadt    42: #endif /* not lint */
                     43:
                     44: #include <stdio.h>
                     45:
                     46: int
                     47: foldit(chunk, col, max)
                     48:        char *chunk;
                     49:        int col, max;
                     50: {
1.3     ! mpech      51:        char *cp;
1.1       deraadt    52:
                     53:        /*
                     54:         * Keep track of column position. Insert hidden newline
                     55:         * if this chunk puts us over the limit.
                     56:         */
                     57: again:
                     58:        cp = chunk;
                     59:        while (*cp) {
                     60:                switch(*cp) {
                     61:                case '\n':
                     62:                case '\r':
                     63:                        col = 0;
                     64:                        break;
                     65:                case '\t':
                     66:                        col = col + 8 &~ 07;
                     67:                        break;
                     68:                case '\b':
                     69:                        col = col ? col - 1 : 0;
                     70:                        break;
                     71:                default:
                     72:                        col++;
                     73:                }
                     74:                if (col > (max - 2)) {
                     75:                        printf("\\\n");
                     76:                        col = 0;
                     77:                        goto again;
                     78:                }
                     79:                cp++;
                     80:        }
                     81:        return (col);
                     82: }