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foldit.c revision 1.2 
      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, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 /*static char sccsid[] = "from: @(#)foldit.c	5.1 (Berkeley) 4/18/91";*/
     36 static char rcsid[] = "$Id: foldit.c,v 1.2 1993/08/01 18:04:01 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 foldit(chunk, col, max)
     40 	char *chunk;
     41 {
     42 	register char *cp;
     43 
     44 	/*
     45 	 * Keep track of column position. Insert hidden newline
     46 	 * if this chunk puts us over the limit.
     47 	 */
     48 again:
     49 	cp = chunk;
     50 	while (*cp) {
     51 		switch(*cp) {
     52 		case '\n':
     53 		case '\r':
     54 			col = 0;
     55 			break;
     56 		case '\t':
     57 			col = col + 8 &~ 07;
     58 			break;
     59 		case '\b':
     60 			col = col ? col - 1 : 0;
     61 			break;
     62 		default:
     63 			col++;
     64 		}
     65 		if (col > (max - 2)) {
     66 			printf("\\\n");
     67 			col = 0;
     68 			goto again;
     69 		}
     70 		cp++;
     71 	}
     72 	return (col);
     73 }
     74