294 lines
6.6 KiB
C
294 lines
6.6 KiB
C
/* $NetBSD: unvis.c,v 1.17 1999/12/01 22:03:43 wennmach Exp $ */
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/*-
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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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: unvis.c,v 1.17 1999/12/01 22:03:43 wennmach Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#define __LIBC12_SOURCE__
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#include "namespace.h"
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#include <sys/types.h>
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#include <assert.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <vis.h>
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#ifdef __weak_alias
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__weak_alias(strunvis,_strunvis);
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__weak_alias(unvis,_unvis);
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#endif
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__warn_references(unvis,
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"warning: reference to compatibility unvis(); include <vis.h> for correct reference")
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/*
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* decode driven by state machine
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*/
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#define S_GROUND 0 /* haven't seen escape char */
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#define S_START 1 /* start decoding special sequence */
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#define S_META 2 /* metachar started (M) */
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#define S_META1 3 /* metachar more, regular char (-) */
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#define S_CTRL 4 /* control char started (^) */
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#define S_OCTAL2 5 /* octal digit 2 */
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#define S_OCTAL3 6 /* octal digit 3 */
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#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
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int
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unvis(cp, c, astate, flag)
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char *cp;
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int c;
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int *astate, flag;
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{
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return __unvis13(cp, (int)c, astate, flag);
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}
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/*
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* unvis - decode characters previously encoded by vis
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*/
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int
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__unvis13(cp, c, astate, flag)
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char *cp;
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int c;
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int *astate, flag;
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{
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_DIAGASSERT(cp != NULL);
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_DIAGASSERT(astate != NULL);
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if (flag & UNVIS_END) {
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if (*astate == S_OCTAL2 || *astate == S_OCTAL3) {
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*astate = S_GROUND;
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return (UNVIS_VALID);
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}
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return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD);
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}
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switch (*astate) {
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case S_GROUND:
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*cp = 0;
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if (c == '\\') {
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*astate = S_START;
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return (0);
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}
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*cp = c;
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return (UNVIS_VALID);
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case S_START:
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switch(c) {
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case '\\':
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*cp = c;
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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*cp = (c - '0');
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*astate = S_OCTAL2;
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return (0);
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case 'M':
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*cp = (char)0200;
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*astate = S_META;
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return (0);
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case '^':
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*astate = S_CTRL;
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return (0);
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case 'n':
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*cp = '\n';
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case 'r':
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*cp = '\r';
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case 'b':
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*cp = '\b';
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case 'a':
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*cp = '\007';
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case 'v':
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*cp = '\v';
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case 't':
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*cp = '\t';
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case 'f':
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*cp = '\f';
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case 's':
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*cp = ' ';
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case 'E':
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*cp = '\033';
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case '\n':
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/*
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* hidden newline
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*/
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*astate = S_GROUND;
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return (UNVIS_NOCHAR);
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case '$':
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/*
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* hidden marker
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*/
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*astate = S_GROUND;
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return (UNVIS_NOCHAR);
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default:
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/*
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* backslash escaped character
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*/
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*astate = S_GROUND;
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if (isascii(c) && isgraph(c)) {
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*cp = c;
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return(UNVIS_VALID);
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} else
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return(UNVIS_SYNBAD);
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}
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case S_META:
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if (c == '-')
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*astate = S_META1;
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else if (c == '^')
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*astate = S_CTRL;
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else {
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*astate = S_GROUND;
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return (UNVIS_SYNBAD);
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}
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return (0);
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case S_META1:
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*astate = S_GROUND;
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*cp |= c;
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return (UNVIS_VALID);
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case S_CTRL:
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if (c == '?')
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*cp |= 0177;
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else
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*cp |= c & 037;
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*astate = S_GROUND;
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return (UNVIS_VALID);
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case S_OCTAL2: /* second possible octal digit */
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if (isoctal(c)) {
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/*
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* yes - and maybe a third
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*/
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*cp = (*cp << 3) + (c - '0');
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*astate = S_OCTAL3;
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return (0);
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}
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/*
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* no - done with current sequence, push back passed char
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*/
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*astate = S_GROUND;
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return (UNVIS_VALIDPUSH);
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case S_OCTAL3: /* third possible octal digit */
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*astate = S_GROUND;
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if (isoctal(c)) {
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*cp = (*cp << 3) + (c - '0');
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return (UNVIS_VALID);
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}
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/*
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* we were done, push back passed char
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*/
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return (UNVIS_VALIDPUSH);
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default:
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/*
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* decoder in unknown state - (probably uninitialized)
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*/
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*astate = S_GROUND;
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return (UNVIS_SYNBAD);
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}
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}
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/*
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* strunvis - decode src into dst
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*
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* Number of chars decoded into dst is returned, -1 on error.
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* Dst is null terminated.
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*/
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int
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strunvis(dst, src)
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char *dst;
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const char *src;
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{
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char c;
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char *start = dst;
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int state = 0;
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_DIAGASSERT(src != NULL);
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_DIAGASSERT(dst != NULL);
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while ((c = *src++) != '\0') {
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again:
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switch (__unvis13(dst, c, &state, 0)) {
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case UNVIS_VALID:
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dst++;
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break;
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case UNVIS_VALIDPUSH:
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dst++;
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goto again;
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case 0:
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case UNVIS_NOCHAR:
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break;
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default:
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return (-1);
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}
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}
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if (__unvis13(dst, c, &state, UNVIS_END) == UNVIS_VALID)
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dst++;
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*dst = '\0';
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return (dst - start);
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}
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