/usr.bin/vis/foldit.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 76 lines · 37 code · 7 blank · 32 comment · 3 complexity · c51721d7ef138369c90f0adeb5b36818 MD5 · raw file
- /*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #ifndef lint
- static const char sccsid[] = "@(#)foldit.c 8.1 (Berkeley) 6/6/93";
- #endif
- #include <stdio.h>
- #include "extern.h"
- int
- foldit(char *chunk, int col, int max)
- {
- char *cp;
- /*
- * Keep track of column position. Insert hidden newline
- * if this chunk puts us over the limit.
- */
- again:
- cp = chunk;
- while (*cp) {
- switch(*cp) {
- case '\n':
- case '\r':
- col = 0;
- break;
- case '\t':
- col = (col + 8) &~ 07;
- break;
- case '\b':
- col = col ? col - 1 : 0;
- break;
- default:
- col++;
- }
- if (col > (max - 2)) {
- printf("\\\n");
- col = 0;
- goto again;
- }
- cp++;
- }
- return (col);
- }