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Annotation of src/usr.bin/vis/foldit.c, Revision 1.8

1.8     ! martijn     1: /*     $OpenBSD: foldit.c,v 1.7 2013/11/12 22:51:18 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.
1.4       millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: #include <stdio.h>
                     34:
1.6       deraadt    35: int    foldit(char *chunk, int col, int max);
                     36:
1.1       deraadt    37: int
1.6       deraadt    38: foldit(char *chunk, int col, int max)
1.1       deraadt    39: {
1.3       mpech      40:        char *cp;
1.8     ! martijn    41:        int first = (col != 0);
1.1       deraadt    42:
                     43:        /*
                     44:         * Keep track of column position. Insert hidden newline
                     45:         * if this chunk puts us over the limit.
                     46:         */
                     47: again:
                     48:        cp = chunk;
                     49:        while (*cp) {
                     50:                switch(*cp) {
                     51:                case '\n':
                     52:                case '\r':
                     53:                        col = 0;
                     54:                        break;
                     55:                case '\t':
1.7       deraadt    56:                        col = (col + 8) & ~07;
1.1       deraadt    57:                        break;
                     58:                case '\b':
                     59:                        col = col ? col - 1 : 0;
                     60:                        break;
                     61:                default:
                     62:                        col++;
                     63:                }
                     64:                if (col > (max - 2)) {
1.8     ! martijn    65:                        if (!first)
        !            66:                                return (col);
1.1       deraadt    67:                        printf("\\\n");
                     68:                        col = 0;
1.8     ! martijn    69:                        first = 0;
1.1       deraadt    70:                        goto again;
                     71:                }
                     72:                cp++;
                     73:        }
                     74:        return (col);
                     75: }