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