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138 lines
3.7 KiB
C
138 lines
3.7 KiB
C
/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char rcsid[] = "$OpenBSD: vis.c,v 1.5 2000/07/19 15:25:13 deraadt Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include "includes.h"
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#ifndef HAVE_VIS
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#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
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/*
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* vis - visually encode characters
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*/
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char *vis(char *dst, int c, int flag, int nextc)
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{
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if (((u_int)c <= UCHAR_MAX && isascii((u_char)c) &&
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isgraph((u_char)c)) ||
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((flag & VIS_SP) == 0 && c == ' ') ||
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((flag & VIS_TAB) == 0 && c == '\t') ||
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((flag & VIS_NL) == 0 && c == '\n') ||
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((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
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*dst++ = c;
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if (c == '\\' && (flag & VIS_NOSLASH) == 0)
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*dst++ = '\\';
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*dst = '\0';
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return (dst);
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}
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if (flag & VIS_CSTYLE) {
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switch(c) {
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case '\n':
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*dst++ = '\\';
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*dst++ = 'n';
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goto done;
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case '\r':
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*dst++ = '\\';
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*dst++ = 'r';
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goto done;
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case '\b':
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*dst++ = '\\';
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*dst++ = 'b';
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goto done;
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#ifdef __STDC__
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case '\a':
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#else
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case '\007':
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#endif
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*dst++ = '\\';
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*dst++ = 'a';
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goto done;
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case '\v':
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*dst++ = '\\';
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*dst++ = 'v';
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goto done;
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case '\t':
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*dst++ = '\\';
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*dst++ = 't';
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goto done;
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case '\f':
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*dst++ = '\\';
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*dst++ = 'f';
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goto done;
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case ' ':
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*dst++ = '\\';
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*dst++ = 's';
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goto done;
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case '\0':
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*dst++ = '\\';
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*dst++ = '0';
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if (isoctal(nextc)) {
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*dst++ = '0';
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*dst++ = '0';
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}
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goto done;
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}
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}
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if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
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*dst++ = '\\';
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*dst++ = ((u_char)c >> 6 & 07) + '0';
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*dst++ = ((u_char)c >> 3 & 07) + '0';
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*dst++ = ((u_char)c & 07) + '0';
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goto done;
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}
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if ((flag & VIS_NOSLASH) == 0)
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*dst++ = '\\';
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if (c & 0200) {
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c &= 0177;
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*dst++ = 'M';
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}
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if (iscntrl(c)) {
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*dst++ = '^';
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if (c == 0177)
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*dst++ = '?';
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else
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*dst++ = c + '@';
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} else {
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*dst++ = '-';
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*dst++ = c;
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}
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done:
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*dst = '\0';
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return (dst);
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}
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#endif /* HAVE_VIS */
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