-/* $NetBSD: unvis.c,v 1.44 2014/09/26 15:43:36 roy Exp $ */
-
-/*-
- * Copyright (c) 1989, 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.
- * 3. 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.
- */
-
-/*
- * HEAVILY trimmed down for use only in dhcpcd.
- * Please use the source in NetBSD for a fuller working copy.
- */
-
-#include <sys/types.h>
-
-#include <assert.h>
-#include <ctype.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <errno.h>
-
-#define IN_LIBDHCPCD
-#include "dhcpcd.h"
-
-#ifndef __arraycount
-#define __arraycount(__x) (sizeof(__x) / sizeof(__x[0]))
-#endif
-
-/*
- * decode driven by state machine
- */
-#define S_GROUND 0 /* haven't seen escape char */
-#define S_START 1 /* start decoding special sequence */
-#define S_META 2 /* metachar started (M) */
-#define S_META1 3 /* metachar more, regular char (-) */
-#define S_CTRL 4 /* control char started (^) */
-#define S_OCTAL2 5 /* octal digit 2 */
-#define S_OCTAL3 6 /* octal digit 3 */
-#define S_HEX 7 /* mandatory hex digit */
-#define S_HEX1 8 /* http hex digit */
-#define S_HEX2 9 /* http hex digit 2 */
-
-#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
-#define xtod(c) (isdigit(c) ? (c - '0') : ((tolower(c) - 'a') + 10))
-
-#define _VIS_END 0x0800 /* for unvis */
-#define UNVIS_END _VIS_END
-
-/*
- * unvis return codes
- */
-#define UNVIS_VALID 1 /* character valid */
-#define UNVIS_VALIDPUSH 2 /* character valid, push back passed char */
-#define UNVIS_NOCHAR 3 /* valid sequence, no character produced */
-#define UNVIS_SYNBAD -1 /* unrecognized escape sequence */
-#define UNVIS_ERROR -2 /* decoder in unknown state (unrecoverable) */
-
-/*
- * unvis - decode characters previously encoded by vis
- */
-static int
-unvis(char *cp, int c, int *astate, int flag)
-{
- unsigned char uc = (unsigned char)c;
- unsigned char st;
-
-/*
- * Bottom 8 bits of astate hold the state machine state.
- * Top 8 bits hold the current character in the http 1866 nv string decoding
- */
-#define GS(a) ((a) & 0xff)
-#define SS(a, b) (((uint32_t)(a) << 24) | (b))
-#define GI(a) ((uint32_t)(a) >> 24)
-
- st = (unsigned char)GS(*astate);
-
- if (flag & UNVIS_END) {
- switch (st) {
- case S_OCTAL2:
- case S_OCTAL3:
- case S_HEX2:
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case S_GROUND:
- return UNVIS_NOCHAR;
- default:
- return UNVIS_SYNBAD;
- }
- }
-
- switch (st) {
-
- case S_GROUND:
- *cp = 0;
- if (c == '\\') {
- *astate = SS(0, S_START);
- return UNVIS_NOCHAR;
- }
- *cp = (char)c;
- return UNVIS_VALID;
-
- case S_START:
- switch(c) {
- case '\\':
- *cp = (char)c;
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case '0': case '1': case '2': case '3':
- case '4': case '5': case '6': case '7':
- *cp = (char)(c - '0');
- *astate = SS(0, S_OCTAL2);
- return UNVIS_NOCHAR;
- case 'M':
- *cp = (char)0200;
- *astate = SS(0, S_META);
- return UNVIS_NOCHAR;
- case '^':
- *astate = SS(0, S_CTRL);
- return UNVIS_NOCHAR;
- case 'n':
- *cp = '\n';
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case 'r':
- *cp = '\r';
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case 'b':
- *cp = '\b';
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case 'a':
- *cp = '\007';
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case 'v':
- *cp = '\v';
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case 't':
- *cp = '\t';
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case 'f':
- *cp = '\f';
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case 's':
- *cp = ' ';
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case 'E':
- *cp = '\033';
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- case 'x':
- *astate = SS(0, S_HEX);
- return UNVIS_NOCHAR;
- case '\n':
- /*
- * hidden newline
- */
- *astate = SS(0, S_GROUND);
- return UNVIS_NOCHAR;
- case '$':
- /*
- * hidden marker
- */
- *astate = SS(0, S_GROUND);
- return UNVIS_NOCHAR;
- default:
- if (isgraph(c)) {
- *cp = (char)c;
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
- }
- }
- goto bad;
-
- case S_META:
- if (c == '-')
- *astate = SS(0, S_META1);
- else if (c == '^')
- *astate = SS(0, S_CTRL);
- else
- goto bad;
- return UNVIS_NOCHAR;
-
- case S_META1:
- *astate = SS(0, S_GROUND);
- *cp |= (char)c;
- return UNVIS_VALID;
-
- case S_CTRL:
- if (c == '?')
- *cp |= 0177;
- else
- *cp |= (char)(c & 037);
- *astate = SS(0, S_GROUND);
- return UNVIS_VALID;
-
- case S_OCTAL2: /* second possible octal digit */
- if (isoctal(uc)) {
- /*
- * yes - and maybe a third
- */
- *cp = (char)((*cp << 3) + (c - '0'));
- *astate = SS(0, S_OCTAL3);
- return UNVIS_NOCHAR;
- }
- /*
- * no - done with current sequence, push back passed char
- */
- *astate = SS(0, S_GROUND);
- return UNVIS_VALIDPUSH;
-
- case S_OCTAL3: /* third possible octal digit */
- *astate = SS(0, S_GROUND);
- if (isoctal(uc)) {
- *cp = (char)((*cp << 3) + (c - '0'));
- return UNVIS_VALID;
- }
- /*
- * we were done, push back passed char
- */
- return UNVIS_VALIDPUSH;
-
- case S_HEX:
- if (!isxdigit(uc))
- goto bad;
- /*FALLTHROUGH*/
- case S_HEX1:
- if (isxdigit(uc)) {
- *cp = (char)xtod(uc);
- *astate = SS(0, S_HEX2);
- return UNVIS_NOCHAR;
- }
- /*
- * no - done with current sequence, push back passed char
- */
- *astate = SS(0, S_GROUND);
- return UNVIS_VALIDPUSH;
-
- case S_HEX2:
- *astate = S_GROUND;
- if (isxdigit(uc)) {
- *cp = (char)(xtod(uc) | (*cp << 4));
- return UNVIS_VALID;
- }
- return UNVIS_VALIDPUSH;
-
- default:
- bad:
- /*
- * decoder in unknown state - (probably uninitialized)
- */
- *astate = SS(0, S_GROUND);
- return UNVIS_SYNBAD;
- }
-}
-
-/*
- * strnunvisx - decode src into dst
- *
- * Number of chars decoded into dst is returned, -1 on error.
- * Dst is null terminated.
- */
-
-int
-dhcpcd_strnunvis(char *dst, size_t dlen, const char *src)
-{
- int c;
- char t = '\0', *start = dst;
- int state = 0;
-
-#define CHECKSPACE() \
- do { \
- if (dlen-- == 0) { \
- errno = ENOSPC; \
- return -1; \
- } \
- } while (/*CONSTCOND*/0)
-
- while ((c = *src++) != '\0') {
- again:
- switch (unvis(&t, c, &state, 0)) {
- case UNVIS_VALID:
- CHECKSPACE();
- *dst++ = t;
- break;
- case UNVIS_VALIDPUSH:
- CHECKSPACE();
- *dst++ = t;
- goto again;
- case 0:
- case UNVIS_NOCHAR:
- break;
- case UNVIS_SYNBAD:
- errno = EINVAL;
- return -1;
- default:
- errno = EINVAL;
- return -1;
- }
- }
- if (unvis(&t, c, &state, UNVIS_END) == UNVIS_VALID) {
- CHECKSPACE();
- *dst++ = t;
- }
- CHECKSPACE();
- *dst = '\0';
- return (int)(dst - start);
-}
Roy's Projects / dhcpcd-ui / commitdiff