unvis.c revision 72445
172445Sassar/* $NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft Exp $ */ 272445Sassar 372445Sassar/*- 472445Sassar * Copyright (c) 1989, 1993 572445Sassar * The Regents of the University of California. All rights reserved. 672445Sassar * 772445Sassar * Redistribution and use in source and binary forms, with or without 872445Sassar * modification, are permitted provided that the following conditions 972445Sassar * are met: 1072445Sassar * 1. Redistributions of source code must retain the above copyright 1172445Sassar * notice, this list of conditions and the following disclaimer. 1272445Sassar * 2. Redistributions in binary form must reproduce the above copyright 1372445Sassar * notice, this list of conditions and the following disclaimer in the 1472445Sassar * documentation and/or other materials provided with the distribution. 1572445Sassar * 3. All advertising materials mentioning features or use of this software 1672445Sassar * must display the following acknowledgement: 1772445Sassar * This product includes software developed by the University of 1872445Sassar * California, Berkeley and its contributors. 1972445Sassar * 4. Neither the name of the University nor the names of its contributors 2072445Sassar * may be used to endorse or promote products derived from this software 2172445Sassar * without specific prior written permission. 2272445Sassar * 2372445Sassar * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2472445Sassar * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2572445Sassar * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2672445Sassar * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2772445Sassar * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2872445Sassar * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2972445Sassar * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3072445Sassar * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3172445Sassar * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3272445Sassar * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3372445Sassar * SUCH DAMAGE. 3472445Sassar */ 3572445Sassar 3672445Sassar#if 1 3772445Sassar#ifdef HAVE_CONFIG_H 3872445Sassar#include <config.h> 3972445SassarRCSID("$Id: unvis.c,v 1.2 2000/12/06 21:41:46 joda Exp $"); 4072445Sassar#endif 4172445Sassar#include <roken.h> 4272445Sassar#ifndef _DIAGASSERT 4372445Sassar#define _DIAGASSERT(X) 4472445Sassar#endif 4572445Sassar#else 4672445Sassar#include <sys/cdefs.h> 4772445Sassar#if defined(LIBC_SCCS) && !defined(lint) 4872445Sassar#if 0 4972445Sassarstatic char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93"; 5072445Sassar#else 5172445Sassar__RCSID("$NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft Exp $"); 5272445Sassar#endif 5372445Sassar#endif /* LIBC_SCCS and not lint */ 5472445Sassar 5572445Sassar#define __LIBC12_SOURCE__ 5672445Sassar 5772445Sassar#include "namespace.h" 5872445Sassar#endif 5972445Sassar#include <sys/types.h> 6072445Sassar 6172445Sassar#include <assert.h> 6272445Sassar#include <ctype.h> 6372445Sassar#include <stdio.h> 6472445Sassar#include <vis.h> 6572445Sassar 6672445Sassar#if 0 6772445Sassar#ifdef __weak_alias 6872445Sassar__weak_alias(strunvis,_strunvis) 6972445Sassar__weak_alias(unvis,_unvis) 7072445Sassar#endif 7172445Sassar 7272445Sassar__warn_references(unvis, 7372445Sassar "warning: reference to compatibility unvis(); include <vis.h> for correct reference") 7472445Sassar#endif 7572445Sassar 7672445Sassar/* 7772445Sassar * decode driven by state machine 7872445Sassar */ 7972445Sassar#define S_GROUND 0 /* haven't seen escape char */ 8072445Sassar#define S_START 1 /* start decoding special sequence */ 8172445Sassar#define S_META 2 /* metachar started (M) */ 8272445Sassar#define S_META1 3 /* metachar more, regular char (-) */ 8372445Sassar#define S_CTRL 4 /* control char started (^) */ 8472445Sassar#define S_OCTAL2 5 /* octal digit 2 */ 8572445Sassar#define S_OCTAL3 6 /* octal digit 3 */ 8672445Sassar 8772445Sassar#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 8872445Sassar 8972445Sassar/* 9072445Sassar * unvis - decode characters previously encoded by vis 9172445Sassar */ 9272445Sassar#ifndef HAVE_UNVIS 9372445Sassarint 9472445Sassarunvis(char *cp, int c, int *astate, int flag) 9572445Sassar{ 9672445Sassar 9772445Sassar _DIAGASSERT(cp != NULL); 9872445Sassar _DIAGASSERT(astate != NULL); 9972445Sassar 10072445Sassar if (flag & UNVIS_END) { 10172445Sassar if (*astate == S_OCTAL2 || *astate == S_OCTAL3) { 10272445Sassar *astate = S_GROUND; 10372445Sassar return (UNVIS_VALID); 10472445Sassar } 10572445Sassar return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD); 10672445Sassar } 10772445Sassar 10872445Sassar switch (*astate) { 10972445Sassar 11072445Sassar case S_GROUND: 11172445Sassar *cp = 0; 11272445Sassar if (c == '\\') { 11372445Sassar *astate = S_START; 11472445Sassar return (0); 11572445Sassar } 11672445Sassar *cp = c; 11772445Sassar return (UNVIS_VALID); 11872445Sassar 11972445Sassar case S_START: 12072445Sassar switch(c) { 12172445Sassar case '\\': 12272445Sassar *cp = c; 12372445Sassar *astate = S_GROUND; 12472445Sassar return (UNVIS_VALID); 12572445Sassar case '0': case '1': case '2': case '3': 12672445Sassar case '4': case '5': case '6': case '7': 12772445Sassar *cp = (c - '0'); 12872445Sassar *astate = S_OCTAL2; 12972445Sassar return (0); 13072445Sassar case 'M': 13172445Sassar *cp = (char)0200; 13272445Sassar *astate = S_META; 13372445Sassar return (0); 13472445Sassar case '^': 13572445Sassar *astate = S_CTRL; 13672445Sassar return (0); 13772445Sassar case 'n': 13872445Sassar *cp = '\n'; 13972445Sassar *astate = S_GROUND; 14072445Sassar return (UNVIS_VALID); 14172445Sassar case 'r': 14272445Sassar *cp = '\r'; 14372445Sassar *astate = S_GROUND; 14472445Sassar return (UNVIS_VALID); 14572445Sassar case 'b': 14672445Sassar *cp = '\b'; 14772445Sassar *astate = S_GROUND; 14872445Sassar return (UNVIS_VALID); 14972445Sassar case 'a': 15072445Sassar *cp = '\007'; 15172445Sassar *astate = S_GROUND; 15272445Sassar return (UNVIS_VALID); 15372445Sassar case 'v': 15472445Sassar *cp = '\v'; 15572445Sassar *astate = S_GROUND; 15672445Sassar return (UNVIS_VALID); 15772445Sassar case 't': 15872445Sassar *cp = '\t'; 15972445Sassar *astate = S_GROUND; 16072445Sassar return (UNVIS_VALID); 16172445Sassar case 'f': 16272445Sassar *cp = '\f'; 16372445Sassar *astate = S_GROUND; 16472445Sassar return (UNVIS_VALID); 16572445Sassar case 's': 16672445Sassar *cp = ' '; 16772445Sassar *astate = S_GROUND; 16872445Sassar return (UNVIS_VALID); 16972445Sassar case 'E': 17072445Sassar *cp = '\033'; 17172445Sassar *astate = S_GROUND; 17272445Sassar return (UNVIS_VALID); 17372445Sassar case '\n': 17472445Sassar /* 17572445Sassar * hidden newline 17672445Sassar */ 17772445Sassar *astate = S_GROUND; 17872445Sassar return (UNVIS_NOCHAR); 17972445Sassar case '$': 18072445Sassar /* 18172445Sassar * hidden marker 18272445Sassar */ 18372445Sassar *astate = S_GROUND; 18472445Sassar return (UNVIS_NOCHAR); 18572445Sassar } 18672445Sassar *astate = S_GROUND; 18772445Sassar return (UNVIS_SYNBAD); 18872445Sassar 18972445Sassar case S_META: 19072445Sassar if (c == '-') 19172445Sassar *astate = S_META1; 19272445Sassar else if (c == '^') 19372445Sassar *astate = S_CTRL; 19472445Sassar else { 19572445Sassar *astate = S_GROUND; 19672445Sassar return (UNVIS_SYNBAD); 19772445Sassar } 19872445Sassar return (0); 19972445Sassar 20072445Sassar case S_META1: 20172445Sassar *astate = S_GROUND; 20272445Sassar *cp |= c; 20372445Sassar return (UNVIS_VALID); 20472445Sassar 20572445Sassar case S_CTRL: 20672445Sassar if (c == '?') 20772445Sassar *cp |= 0177; 20872445Sassar else 20972445Sassar *cp |= c & 037; 21072445Sassar *astate = S_GROUND; 21172445Sassar return (UNVIS_VALID); 21272445Sassar 21372445Sassar case S_OCTAL2: /* second possible octal digit */ 21472445Sassar if (isoctal(c)) { 21572445Sassar /* 21672445Sassar * yes - and maybe a third 21772445Sassar */ 21872445Sassar *cp = (*cp << 3) + (c - '0'); 21972445Sassar *astate = S_OCTAL3; 22072445Sassar return (0); 22172445Sassar } 22272445Sassar /* 22372445Sassar * no - done with current sequence, push back passed char 22472445Sassar */ 22572445Sassar *astate = S_GROUND; 22672445Sassar return (UNVIS_VALIDPUSH); 22772445Sassar 22872445Sassar case S_OCTAL3: /* third possible octal digit */ 22972445Sassar *astate = S_GROUND; 23072445Sassar if (isoctal(c)) { 23172445Sassar *cp = (*cp << 3) + (c - '0'); 23272445Sassar return (UNVIS_VALID); 23372445Sassar } 23472445Sassar /* 23572445Sassar * we were done, push back passed char 23672445Sassar */ 23772445Sassar return (UNVIS_VALIDPUSH); 23872445Sassar 23972445Sassar default: 24072445Sassar /* 24172445Sassar * decoder in unknown state - (probably uninitialized) 24272445Sassar */ 24372445Sassar *astate = S_GROUND; 24472445Sassar return (UNVIS_SYNBAD); 24572445Sassar } 24672445Sassar} 24772445Sassar#endif 24872445Sassar 24972445Sassar/* 25072445Sassar * strunvis - decode src into dst 25172445Sassar * 25272445Sassar * Number of chars decoded into dst is returned, -1 on error. 25372445Sassar * Dst is null terminated. 25472445Sassar */ 25572445Sassar 25672445Sassar#ifndef HAVE_STRUNVIS 25772445Sassarint 25872445Sassarstrunvis(char *dst, const char *src) 25972445Sassar{ 26072445Sassar char c; 26172445Sassar char *start = dst; 26272445Sassar int state = 0; 26372445Sassar 26472445Sassar _DIAGASSERT(src != NULL); 26572445Sassar _DIAGASSERT(dst != NULL); 26672445Sassar 26772445Sassar while ((c = *src++) != '\0') { 26872445Sassar again: 26972445Sassar switch (unvis(dst, c, &state, 0)) { 27072445Sassar case UNVIS_VALID: 27172445Sassar dst++; 27272445Sassar break; 27372445Sassar case UNVIS_VALIDPUSH: 27472445Sassar dst++; 27572445Sassar goto again; 27672445Sassar case 0: 27772445Sassar case UNVIS_NOCHAR: 27872445Sassar break; 27972445Sassar default: 28072445Sassar return (-1); 28172445Sassar } 28272445Sassar } 28372445Sassar if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID) 28472445Sassar dst++; 28572445Sassar *dst = '\0'; 28672445Sassar return (dst - start); 28772445Sassar} 28872445Sassar#endif 289