unvis.c revision 178825
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. 15178825Sdfr * 3. Neither the name of the University nor the names of its contributors 1672445Sassar * may be used to endorse or promote products derived from this software 1772445Sassar * without specific prior written permission. 1872445Sassar * 1972445Sassar * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2072445Sassar * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2172445Sassar * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2272445Sassar * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2372445Sassar * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2472445Sassar * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2572445Sassar * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2672445Sassar * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2772445Sassar * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2872445Sassar * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2972445Sassar * SUCH DAMAGE. 3072445Sassar */ 3172445Sassar 3272445Sassar#if 1 3372445Sassar#ifdef HAVE_CONFIG_H 3472445Sassar#include <config.h> 35178825SdfrRCSID("$Id: unvis.c 21005 2007-06-08 01:54:35Z lha $"); 3672445Sassar#endif 37178825Sdfr#include "roken.h" 3872445Sassar#ifndef _DIAGASSERT 3972445Sassar#define _DIAGASSERT(X) 4072445Sassar#endif 4172445Sassar#else 4272445Sassar#include <sys/cdefs.h> 4372445Sassar#if defined(LIBC_SCCS) && !defined(lint) 4472445Sassar#if 0 4572445Sassarstatic char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93"; 4672445Sassar#else 4772445Sassar__RCSID("$NetBSD: unvis.c,v 1.19 2000/01/22 22:19:13 mycroft Exp $"); 4872445Sassar#endif 4972445Sassar#endif /* LIBC_SCCS and not lint */ 5072445Sassar 5172445Sassar#define __LIBC12_SOURCE__ 5272445Sassar 5372445Sassar#include "namespace.h" 5472445Sassar#endif 5572445Sassar#include <sys/types.h> 5672445Sassar 5772445Sassar#include <assert.h> 5872445Sassar#include <ctype.h> 5972445Sassar#include <stdio.h> 6072445Sassar#include <vis.h> 6172445Sassar 6272445Sassar#if 0 6372445Sassar#ifdef __weak_alias 6472445Sassar__weak_alias(strunvis,_strunvis) 6572445Sassar__weak_alias(unvis,_unvis) 6672445Sassar#endif 6772445Sassar 6872445Sassar__warn_references(unvis, 6972445Sassar "warning: reference to compatibility unvis(); include <vis.h> for correct reference") 7072445Sassar#endif 7172445Sassar 7272445Sassar/* 7372445Sassar * decode driven by state machine 7472445Sassar */ 7572445Sassar#define S_GROUND 0 /* haven't seen escape char */ 7672445Sassar#define S_START 1 /* start decoding special sequence */ 7772445Sassar#define S_META 2 /* metachar started (M) */ 7872445Sassar#define S_META1 3 /* metachar more, regular char (-) */ 7972445Sassar#define S_CTRL 4 /* control char started (^) */ 8072445Sassar#define S_OCTAL2 5 /* octal digit 2 */ 8172445Sassar#define S_OCTAL3 6 /* octal digit 3 */ 8272445Sassar 8372445Sassar#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') 8472445Sassar 85178825Sdfrint ROKEN_LIB_FUNCTION 86178825Sdfr rk_strunvis (char *, const char *); 87178825Sdfrint ROKEN_LIB_FUNCTION 88178825Sdfr rk_unvis (char *, int, int *, int); 89178825Sdfr 9072445Sassar/* 9172445Sassar * unvis - decode characters previously encoded by vis 9272445Sassar */ 93178825Sdfr 94178825Sdfrint ROKEN_LIB_FUNCTION 95178825Sdfrrk_unvis(char *cp, int c, int *astate, int flag) 9672445Sassar{ 9772445Sassar 9872445Sassar _DIAGASSERT(cp != NULL); 9972445Sassar _DIAGASSERT(astate != NULL); 10072445Sassar 10172445Sassar if (flag & UNVIS_END) { 10272445Sassar if (*astate == S_OCTAL2 || *astate == S_OCTAL3) { 10372445Sassar *astate = S_GROUND; 10472445Sassar return (UNVIS_VALID); 10572445Sassar } 10672445Sassar return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD); 10772445Sassar } 10872445Sassar 10972445Sassar switch (*astate) { 11072445Sassar 11172445Sassar case S_GROUND: 11272445Sassar *cp = 0; 11372445Sassar if (c == '\\') { 11472445Sassar *astate = S_START; 11572445Sassar return (0); 11672445Sassar } 11772445Sassar *cp = c; 11872445Sassar return (UNVIS_VALID); 11972445Sassar 12072445Sassar case S_START: 12172445Sassar switch(c) { 12272445Sassar case '\\': 12372445Sassar *cp = c; 12472445Sassar *astate = S_GROUND; 12572445Sassar return (UNVIS_VALID); 12672445Sassar case '0': case '1': case '2': case '3': 12772445Sassar case '4': case '5': case '6': case '7': 12872445Sassar *cp = (c - '0'); 12972445Sassar *astate = S_OCTAL2; 13072445Sassar return (0); 13172445Sassar case 'M': 13272445Sassar *cp = (char)0200; 13372445Sassar *astate = S_META; 13472445Sassar return (0); 13572445Sassar case '^': 13672445Sassar *astate = S_CTRL; 13772445Sassar return (0); 13872445Sassar case 'n': 13972445Sassar *cp = '\n'; 14072445Sassar *astate = S_GROUND; 14172445Sassar return (UNVIS_VALID); 14272445Sassar case 'r': 14372445Sassar *cp = '\r'; 14472445Sassar *astate = S_GROUND; 14572445Sassar return (UNVIS_VALID); 14672445Sassar case 'b': 14772445Sassar *cp = '\b'; 14872445Sassar *astate = S_GROUND; 14972445Sassar return (UNVIS_VALID); 15072445Sassar case 'a': 15172445Sassar *cp = '\007'; 15272445Sassar *astate = S_GROUND; 15372445Sassar return (UNVIS_VALID); 15472445Sassar case 'v': 15572445Sassar *cp = '\v'; 15672445Sassar *astate = S_GROUND; 15772445Sassar return (UNVIS_VALID); 15872445Sassar case 't': 15972445Sassar *cp = '\t'; 16072445Sassar *astate = S_GROUND; 16172445Sassar return (UNVIS_VALID); 16272445Sassar case 'f': 16372445Sassar *cp = '\f'; 16472445Sassar *astate = S_GROUND; 16572445Sassar return (UNVIS_VALID); 16672445Sassar case 's': 16772445Sassar *cp = ' '; 16872445Sassar *astate = S_GROUND; 16972445Sassar return (UNVIS_VALID); 17072445Sassar case 'E': 17172445Sassar *cp = '\033'; 17272445Sassar *astate = S_GROUND; 17372445Sassar return (UNVIS_VALID); 17472445Sassar case '\n': 17572445Sassar /* 17672445Sassar * hidden newline 17772445Sassar */ 17872445Sassar *astate = S_GROUND; 17972445Sassar return (UNVIS_NOCHAR); 18072445Sassar case '$': 18172445Sassar /* 18272445Sassar * hidden marker 18372445Sassar */ 18472445Sassar *astate = S_GROUND; 18572445Sassar return (UNVIS_NOCHAR); 18672445Sassar } 18772445Sassar *astate = S_GROUND; 18872445Sassar return (UNVIS_SYNBAD); 18972445Sassar 19072445Sassar case S_META: 19172445Sassar if (c == '-') 19272445Sassar *astate = S_META1; 19372445Sassar else if (c == '^') 19472445Sassar *astate = S_CTRL; 19572445Sassar else { 19672445Sassar *astate = S_GROUND; 19772445Sassar return (UNVIS_SYNBAD); 19872445Sassar } 19972445Sassar return (0); 20072445Sassar 20172445Sassar case S_META1: 20272445Sassar *astate = S_GROUND; 20372445Sassar *cp |= c; 20472445Sassar return (UNVIS_VALID); 20572445Sassar 20672445Sassar case S_CTRL: 20772445Sassar if (c == '?') 20872445Sassar *cp |= 0177; 20972445Sassar else 21072445Sassar *cp |= c & 037; 21172445Sassar *astate = S_GROUND; 21272445Sassar return (UNVIS_VALID); 21372445Sassar 21472445Sassar case S_OCTAL2: /* second possible octal digit */ 21572445Sassar if (isoctal(c)) { 21672445Sassar /* 21772445Sassar * yes - and maybe a third 21872445Sassar */ 21972445Sassar *cp = (*cp << 3) + (c - '0'); 22072445Sassar *astate = S_OCTAL3; 22172445Sassar return (0); 22272445Sassar } 22372445Sassar /* 22472445Sassar * no - done with current sequence, push back passed char 22572445Sassar */ 22672445Sassar *astate = S_GROUND; 22772445Sassar return (UNVIS_VALIDPUSH); 22872445Sassar 22972445Sassar case S_OCTAL3: /* third possible octal digit */ 23072445Sassar *astate = S_GROUND; 23172445Sassar if (isoctal(c)) { 23272445Sassar *cp = (*cp << 3) + (c - '0'); 23372445Sassar return (UNVIS_VALID); 23472445Sassar } 23572445Sassar /* 23672445Sassar * we were done, push back passed char 23772445Sassar */ 23872445Sassar return (UNVIS_VALIDPUSH); 23972445Sassar 24072445Sassar default: 24172445Sassar /* 24272445Sassar * decoder in unknown state - (probably uninitialized) 24372445Sassar */ 24472445Sassar *astate = S_GROUND; 24572445Sassar return (UNVIS_SYNBAD); 24672445Sassar } 24772445Sassar} 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 256178825Sdfrint ROKEN_LIB_FUNCTION 257178825Sdfrrk_strunvis(char *dst, const char *src) 25872445Sassar{ 25972445Sassar char c; 26072445Sassar char *start = dst; 26172445Sassar int state = 0; 26272445Sassar 26372445Sassar _DIAGASSERT(src != NULL); 26472445Sassar _DIAGASSERT(dst != NULL); 26572445Sassar 26672445Sassar while ((c = *src++) != '\0') { 26772445Sassar again: 268178825Sdfr switch (rk_unvis(dst, (unsigned char)c, &state, 0)) { 26972445Sassar case UNVIS_VALID: 27072445Sassar dst++; 27172445Sassar break; 27272445Sassar case UNVIS_VALIDPUSH: 27372445Sassar dst++; 27472445Sassar goto again; 27572445Sassar case 0: 27672445Sassar case UNVIS_NOCHAR: 27772445Sassar break; 27872445Sassar default: 27972445Sassar return (-1); 28072445Sassar } 28172445Sassar } 282178825Sdfr if (unvis(dst, (unsigned char)c, &state, UNVIS_END) == UNVIS_VALID) 28372445Sassar dst++; 28472445Sassar *dst = '\0'; 28572445Sassar return (dst - start); 28672445Sassar} 287