kc3-lang/libbsd/src/vis.c

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• Hash : 304a1f83
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  Date : 2024-01-08T23:37:43
  

  doc: Use macOS to refer to the operating system This is the correct spelling, instead of capitalizing it.

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• src/vis.c

• /*	$NetBSD: vis.c,v 1.74 2017/11/27 16:37:21 christos 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.
   */
  
  /*-
   * Copyright (c) 1999, 2005 The NetBSD Foundation, Inc.
   * 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.
   *
   * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
   */
  
  #include <sys/cdefs.h>
  #include <sys/types.h>
  
  #include <assert.h>
  #pragma GCC diagnostic push
  #pragma GCC diagnostic ignored "-Wcpp"
  #include <vis.h>
  #pragma GCC diagnostic pop
  #include <errno.h>
  #include <stdlib.h>
  #include <wchar.h>
  #include <wctype.h>
  
  #ifdef __weak_alias
  __weak_alias(strvisx,_strvisx)
  #endif
  
  #include <ctype.h>
  #include <limits.h>
  #include <stdio.h>
  #include <string.h>
  
  #include "local-link.h"
  
  #define _DIAGASSERT(x)
  
  /*
   * The reason for going through the trouble to deal with character encodings
   * in vis(3), is that we use this to safe encode output of commands. This
   * safe encoding varies depending on the character set. For example if we
   * display ps output in French, we don't want to display French characters
   * as M-foo.
   */
  
  static wchar_t *do_svis(wchar_t *, wint_t, int, wint_t, const wchar_t *);
  
  #undef BELL
  #define BELL L'\a'
  
  #if defined(LC_C_LOCALE)
  #define iscgraph(c)      isgraph_l(c, LC_C_LOCALE)
  #else
  /* Keep it simple for now, no locale stuff */
  #define iscgraph(c)	isgraph(c)
  #ifdef notyet
  #include <locale.h>
  static int
  iscgraph(int c) {
  	int rv;
  	char *ol;
  
  	ol = setlocale(LC_CTYPE, "C");
  	rv = isgraph(c);
  	if (ol)
  		setlocale(LC_CTYPE, ol);
  	return rv;
  }
  #endif
  #endif
  
  #define ISGRAPH(flags, c) \
      (((flags) & VIS_NOLOCALE) ? iscgraph(c) : iswgraph(c))
  
  #define iswoctal(c)	\
  	(((unsigned char)(c)) >= L'0' && ((unsigned char)(c)) <= L'7')
  #define iswwhite(c)	(c == L' ' || c == L'\t' || c == L'\n')
  #define iswsafe(c)	(c == L'\b' || c == BELL || c == L'\r')
  #define xtoa(c)		L"0123456789abcdef"[c]
  #define XTOA(c)		L"0123456789ABCDEF"[c]
  
  #define MAXEXTRAS	30
  
  static const wchar_t char_shell[] = L"'`\";&<>()|{}]\\$!^~";
  static const wchar_t char_glob[] = L"*?[#";
  
  /*
   * On NetBSD and glibc MB_LEN_MAX is currently > 8 which does not fit on any
   * integer integral type and it is probably wrong, since currently the maximum
   * number of bytes and character needs is 6. Until this is fixed, the
   * loops below are using sizeof(uint64_t) - 1 instead of MB_LEN_MAX, and
   * the assertion is commented out.
   */
  #if 0
  #ifndef CTASSERT
  #define CTASSERT(x)             _CTASSERT(x, __LINE__)
  #define _CTASSERT(x, y)         __CTASSERT(x, y)
  #define __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1 : -1]
  #endif
  
  CTASSERT(MB_LEN_MAX <= sizeof(uint64_t));
  #endif
  
  /*
   * This is do_hvis, for HTTP style (RFC 1808)
   */
  static wchar_t *
  do_hvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
  {
  	if (iswalnum(c)
  	    /* safe */
  	    || c == L'$' || c == L'-' || c == L'_' || c == L'.' || c == L'+'
  	    /* extra */
  	    || c == L'!' || c == L'*' || c == L'\'' || c == L'(' || c == L')'
  	    || c == L',')
  		dst = do_svis(dst, c, flags, nextc, extra);
  	else {
  		*dst++ = L'%';
  		*dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
  		*dst++ = xtoa((unsigned int)c & 0xf);
  	}
  
  	return dst;
  }
  
  /*
   * This is do_mvis, for Quoted-Printable MIME (RFC 2045)
   * NB: No handling of long lines or CRLF.
   */
  static wchar_t *
  do_mvis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
  {
  	if ((c != L'\n') &&
  	    /* Space at the end of the line */
  	    ((iswspace(c) && (nextc == L'\r' || nextc == L'\n')) ||
  	    /* Out of range */
  	    (!iswspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
  	    /* Specific char to be escaped */
  	    wcschr(L"#$@[\\]^`{|}~", c) != NULL)) {
  		*dst++ = L'=';
  		*dst++ = XTOA(((unsigned int)c >> 4) & 0xf);
  		*dst++ = XTOA((unsigned int)c & 0xf);
  	} else
  		dst = do_svis(dst, c, flags, nextc, extra);
  	return dst;
  }
  
  /*
   * Output single byte of multibyte character.
   */
  static wchar_t *
  do_mbyte(wchar_t *dst, wint_t c, int flags, wint_t nextc, int iswextra)
  {
  	if (flags & VIS_CSTYLE) {
  		switch (c) {
  		case L'\n':
  			*dst++ = L'\\'; *dst++ = L'n';
  			return dst;
  		case L'\r':
  			*dst++ = L'\\'; *dst++ = L'r';
  			return dst;
  		case L'\b':
  			*dst++ = L'\\'; *dst++ = L'b';
  			return dst;
  		case BELL:
  			*dst++ = L'\\'; *dst++ = L'a';
  			return dst;
  		case L'\v':
  			*dst++ = L'\\'; *dst++ = L'v';
  			return dst;
  		case L'\t':
  			*dst++ = L'\\'; *dst++ = L't';
  			return dst;
  		case L'\f':
  			*dst++ = L'\\'; *dst++ = L'f';
  			return dst;
  		case L' ':
  			*dst++ = L'\\'; *dst++ = L's';
  			return dst;
  		case L'\0':
  			*dst++ = L'\\'; *dst++ = L'0';
  			if (iswoctal(nextc)) {
  				*dst++ = L'0';
  				*dst++ = L'0';
  			}
  			return dst;
  		/* We cannot encode these characters in VIS_CSTYLE
  		 * because they special meaning */
  		case L'n':
  		case L'r':
  		case L'b':
  		case L'a':
  		case L'v':
  		case L't':
  		case L'f':
  		case L's':
  		case L'0':
  		case L'M':
  		case L'^':
  		case L'$': /* vis(1) -l */
  			break;
  		default:
  			if (ISGRAPH(flags, c) && !iswoctal(c)) {
  				*dst++ = L'\\';
  				*dst++ = c;
  				return dst;
  			}
  		}
  	}
  	if (iswextra || ((c & 0177) == L' ') || (flags & VIS_OCTAL)) {
  		*dst++ = L'\\';
  		*dst++ =
  			(unsigned char)(((uint32_t)(unsigned char)c >> 6) & 03) + L'0';
  		*dst++ =
  			(unsigned char)(((uint32_t)(unsigned char)c >> 3) & 07) + L'0';
  		*dst++ = (c & 07) + L'0';
  	} else {
  		if ((flags & VIS_NOSLASH) == 0)
  			*dst++ = L'\\';
  
  		if (c & 0200) {
  			c &= 0177;
  			*dst++ = L'M';
  		}
  
  		if (iswcntrl(c)) {
  			*dst++ = L'^';
  			if (c == 0177)
  				*dst++ = L'?';
  			else
  				*dst++ = c + L'@';
  		} else {
  			*dst++ = L'-';
  			*dst++ = c;
  		}
  	}
  
  	return dst;
  }
  
  /*
   * This is do_vis, the central code of vis.
   * dst:	      Pointer to the destination buffer
   * c:	      Character to encode
   * flags:     Flags word
   * nextc:     The character following 'c'
   * extra:     Pointer to the list of extra characters to be
   *	      backslash-protected.
   */
  static wchar_t *
  do_svis(wchar_t *dst, wint_t c, int flags, wint_t nextc, const wchar_t *extra)
  {
  	int iswextra, i, shft;
  	uint64_t bmsk, wmsk;
  
  	iswextra = wcschr(extra, c) != NULL;
  	if (!iswextra && (ISGRAPH(flags, c) || iswwhite(c) ||
  	    ((flags & VIS_SAFE) && iswsafe(c)))) {
  		*dst++ = c;
  		return dst;
  	}
  
  	/* See comment in istrsenvisx() output loop, below. */
  	wmsk = 0;
  	for (i = sizeof(wmsk) - 1; i >= 0; i--) {
  		shft = i * CHAR_BIT;
  		bmsk = (uint64_t)0xffLL << shft;
  		wmsk |= bmsk;
  		if ((c & wmsk) || i == 0)
  			dst = do_mbyte(dst, (wint_t)(
  			    (uint64_t)(c & bmsk) >> shft),
  			    flags, nextc, iswextra);
  	}
  
  	return dst;
  }
  
  typedef wchar_t *(*visfun_t)(wchar_t *, wint_t, int, wint_t, const wchar_t *);
  
  /*
   * Return the appropriate encoding function depending on the flags given.
   */
  static visfun_t
  getvisfun(int flags)
  {
  	if (flags & VIS_HTTPSTYLE)
  		return do_hvis;
  	if (flags & VIS_MIMESTYLE)
  		return do_mvis;
  	return do_svis;
  }
  
  /*
   * Expand list of extra characters to not visually encode.
   */
  static wchar_t *
  makeextralist(int flags, const char *src)
  {
  	wchar_t *dst, *d;
  	size_t len;
  	const wchar_t *s;
  
  	len = strlen(src);
  	if ((dst = calloc(len + MAXEXTRAS, sizeof(*dst))) == NULL)
  		return NULL;
  
  	if ((flags & VIS_NOLOCALE) || mbstowcs(dst, src, len) == (size_t)-1) {
  		size_t i;
  		for (i = 0; i < len; i++)
  			dst[i] = (wchar_t)(unsigned char)src[i];
  		d = dst + len;
  	} else
  		d = dst + wcslen(dst);
  
  	if (flags & VIS_GLOB)
  		for (s = char_glob; *s; *d++ = *s++)
  			continue;
  
  	if (flags & VIS_SHELL)
  		for (s = char_shell; *s; *d++ = *s++)
  			continue;
  
  	if (flags & VIS_SP) *d++ = L' ';
  	if (flags & VIS_TAB) *d++ = L'\t';
  	if (flags & VIS_NL) *d++ = L'\n';
  	if (flags & VIS_DQ) *d++ = L'"';
  	if ((flags & VIS_NOSLASH) == 0) *d++ = L'\\';
  	*d = L'\0';
  
  	return dst;
  }
  
  /*
   * istrsenvisx()
   *	The main internal function.
   *	All user-visible functions call this one.
   */
  static int
  istrsenvisx(char **mbdstp, size_t *dlen, const char *mbsrc, size_t mblength,
      int flags, const char *mbextra, int *cerr_ptr)
  {
  	wchar_t *dst, *src, *pdst, *psrc, *start, *extra;
  	size_t len, olen;
  	uint64_t bmsk, wmsk;
  	wint_t c;
  	visfun_t f;
  	int clen = 0, cerr, error = -1, i, shft;
  	char *mbdst, *mdst;
  	ssize_t mbslength, maxolen;
  
  	_DIAGASSERT(mbdstp != NULL);
  	_DIAGASSERT(mbsrc != NULL || mblength == 0);
  	_DIAGASSERT(mbextra != NULL);
  
  	mbslength = (ssize_t)mblength;
  	/*
  	 * When inputing a single character, must also read in the
  	 * next character for nextc, the look-ahead character.
  	 */
  	if (mbslength == 1)
  		mbslength++;
  
  	/*
  	 * Input (mbsrc) is a char string considered to be multibyte
  	 * characters.  The input loop will read this string pulling
  	 * one character, possibly multiple bytes, from mbsrc and
  	 * converting each to wchar_t in src.
  	 *
  	 * The vis conversion will be done using the wide char
  	 * wchar_t string.
  	 *
  	 * This will then be converted back to a multibyte string to
  	 * return to the caller.
  	 */
  
  	/* Allocate space for the wide char strings */
  	psrc = pdst = extra = NULL;
  	mdst = NULL;
  	if ((psrc = calloc(mbslength + 1, sizeof(*psrc))) == NULL)
  		return -1;
  	if ((pdst = calloc((16 * mbslength) + 1, sizeof(*pdst))) == NULL)
  		goto out;
  	if (*mbdstp == NULL) {
  		if ((mdst = calloc((16 * mbslength) + 1, sizeof(*mdst))) == NULL)
  			goto out;
  		*mbdstp = mdst;
  	}
  
  	mbdst = *mbdstp;
  	dst = pdst;
  	src = psrc;
  
  	if (flags & VIS_NOLOCALE) {
  		/* Do one byte at a time conversion */
  		cerr = 1;
  	} else {
  		/* Use caller's multibyte conversion error flag. */
  		cerr = cerr_ptr ? *cerr_ptr : 0;
  	}
  
  	/*
  	 * Input loop.
  	 * Handle up to mblength characters (not bytes).  We do not
  	 * stop at NULs because we may be processing a block of data
  	 * that includes NULs.
  	 */
  	while (mbslength > 0) {
  		/* Convert one multibyte character to wchar_t. */
  		if (!cerr)
  			clen = mbtowc(src, mbsrc, MB_LEN_MAX);
  		if (cerr || clen < 0) {
  			/* Conversion error, process as a byte instead. */
  			*src = (wint_t)(unsigned char)*mbsrc;
  			clen = 1;
  			cerr = 1;
  		}
  		if (clen == 0) {
  			/*
  			 * NUL in input gives 0 return value. process
  			 * as single NUL byte and keep going.
  			 */
  			clen = 1;
  		}
  		/* Advance buffer character pointer. */
  		src++;
  		/* Advance input pointer by number of bytes read. */
  		mbsrc += clen;
  		/* Decrement input byte count. */
  		mbslength -= clen;
  	}
  	len = src - psrc;
  	src = psrc;
  
  	/*
  	 * In the single character input case, we will have actually
  	 * processed two characters, c and nextc.  Reset len back to
  	 * just a single character.
  	 */
  	if (mblength < len)
  		len = mblength;
  
  	/* Convert extra argument to list of characters for this mode. */
  	extra = makeextralist(flags, mbextra);
  	if (!extra) {
  		if (dlen && *dlen == 0) {
  			errno = ENOSPC;
  			goto out;
  		}
  		*mbdst = '\0';	/* can't create extra, return "" */
  		error = 0;
  		goto out;
  	}
  
  	/* Look up which processing function to call. */
  	f = getvisfun(flags);
  
  	/*
  	 * Main processing loop.
  	 * Call do_Xvis processing function one character at a time
  	 * with next character available for look-ahead.
  	 */
  	for (start = dst; len > 0; len--) {
  		c = *src++;
  		dst = (*f)(dst, c, flags, *src, extra);
  		if (dst == NULL) {
  			errno = ENOSPC;
  			goto out;
  		}
  	}
  
  	/* Terminate the string in the buffer. */
  	*dst = L'\0';
  
  	/*
  	 * Output loop.
  	 * Convert wchar_t string back to multibyte output string.
  	 * If we have hit a multi-byte conversion error on input,
  	 * output byte-by-byte here.  Else use wctomb().
  	 */
  	len = wcslen(start);
  	maxolen = dlen ? *dlen : (wcslen(start) * MB_LEN_MAX + 1);
  	olen = 0;
  	for (dst = start; len > 0; len--) {
  		if (!cerr)
  			clen = wctomb(mbdst, *dst);
  		if (cerr || clen < 0) {
  			/*
  			 * Conversion error, process as a byte(s) instead.
  			 * Examine each byte and higher-order bytes for
  			 * data.  E.g.,
  			 *	0x000000000000a264 -> a2 64
  			 *	0x000000001f00a264 -> 1f 00 a2 64
  			 */
  			clen = 0;
  			wmsk = 0;
  			for (i = sizeof(wmsk) - 1; i >= 0; i--) {
  				shft = i * CHAR_BIT;
  				bmsk = (uint64_t)0xffLL << shft;
  				wmsk |= bmsk;
  				if ((*dst & wmsk) || i == 0)
  					mbdst[clen++] = (char)(
  					    (uint64_t)(*dst & bmsk) >>
  					    shft);
  			}
  			cerr = 1;
  		}
  		/* If this character would exceed our output limit, stop. */
  		if (olen + clen > (size_t)maxolen)
  			break;
  		/* Advance output pointer by number of bytes written. */
  		mbdst += clen;
  		/* Advance buffer character pointer. */
  		dst++;
  		/* Incrment output character count. */
  		olen += clen;
  	}
  
  	/* Terminate the output string. */
  	*mbdst = '\0';
  
  	if (flags & VIS_NOLOCALE) {
  		/* Pass conversion error flag out. */
  		if (cerr_ptr)
  			*cerr_ptr = cerr;
  	}
  
  	free(extra);
  	free(pdst);
  	free(psrc);
  
  	return (int)olen;
  out:
  	free(extra);
  	free(pdst);
  	free(psrc);
  	free(mdst);
  	return error;
  }
  
  static int
  istrsenvisxna(char *mbdst, size_t *dlen, const char *mbsrc, size_t mblength,
      int flags, const char *mbextra, int *cerr_ptr)
  {
  	assert(mbdst != NULL);
  
  	return istrsenvisx(&mbdst, dlen, mbsrc, mblength,
  	    flags, mbextra, cerr_ptr);
  }
  
  static int
  istrsenvisxl(char *mbdst, size_t *dlen, const char *mbsrc,
      int flags, const char *mbextra, int *cerr_ptr)
  {
  	return istrsenvisxna(mbdst, dlen, mbsrc,
  	    mbsrc != NULL ? strlen(mbsrc) : 0, flags, mbextra, cerr_ptr);
  }
  
  
  /*
   *	The "svis" variants all take an "extra" arg that is a pointer
   *	to a NUL-terminated list of characters to be encoded, too.
   *	These functions are useful e. g. to encode strings in such a
   *	way so that they are not interpreted by a shell.
   */
  
  char *
  svis(char *mbdst, int c, int flags, int nextc, const char *mbextra)
  {
  	char cc[2];
  	int ret;
  
  	cc[0] = c;
  	cc[1] = nextc;
  
  	ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, mbextra, NULL);
  	if (ret < 0)
  		return NULL;
  	return mbdst + ret;
  }
  
  char *
  snvis(char *mbdst, size_t dlen, int c, int flags, int nextc, const char *mbextra)
  {
  	char cc[2];
  	int ret;
  
  	cc[0] = c;
  	cc[1] = nextc;
  
  	ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, mbextra, NULL);
  	if (ret < 0)
  		return NULL;
  	return mbdst + ret;
  }
  
  int
  strsvis(char *mbdst, const char *mbsrc, int flags, const char *mbextra)
  {
  	return istrsenvisxl(mbdst, NULL, mbsrc, flags, mbextra, NULL);
  }
  
  int
  strsnvis(char *mbdst, size_t dlen, const char *mbsrc, int flags, const char *mbextra)
  {
  	return istrsenvisxl(mbdst, &dlen, mbsrc, flags, mbextra, NULL);
  }
  
  int
  strsvisx(char *mbdst, const char *mbsrc, size_t len, int flags, const char *mbextra)
  {
  	return istrsenvisxna(mbdst, NULL, mbsrc, len, flags, mbextra, NULL);
  }
  
  int
  strsnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
      const char *mbextra)
  {
  	return istrsenvisxna(mbdst, &dlen, mbsrc, len, flags, mbextra, NULL);
  }
  
  int
  strsenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
      const char *mbextra, int *cerr_ptr)
  {
  	return istrsenvisxna(mbdst, &dlen, mbsrc, len, flags, mbextra, cerr_ptr);
  }
  
  /*
   * vis - visually encode characters
   */
  char *
  vis(char *mbdst, int c, int flags, int nextc)
  {
  	char cc[2];
  	int ret;
  
  	cc[0] = c;
  	cc[1] = nextc;
  
  	ret = istrsenvisx(&mbdst, NULL, cc, 1, flags, "", NULL);
  	if (ret < 0)
  		return NULL;
  	return mbdst + ret;
  }
  
  char *
  nvis(char *mbdst, size_t dlen, int c, int flags, int nextc)
  {
  	char cc[2];
  	int ret;
  
  	cc[0] = c;
  	cc[1] = nextc;
  
  	ret = istrsenvisx(&mbdst, &dlen, cc, 1, flags, "", NULL);
  	if (ret < 0)
  		return NULL;
  	return mbdst + ret;
  }
  
  /*
   * strvis - visually encode characters from src into dst
   *
   *	Dst must be 4 times the size of src to account for possible
   *	expansion.  The length of dst, not including the trailing NULL,
   *	is returned.
   */
  
  int
  strvis(char *mbdst, const char *mbsrc, int flags)
  {
  	return istrsenvisxl(mbdst, NULL, mbsrc, flags, "", NULL);
  }
  
  /*
   * NetBSD added an strnvis and unfortunately made it incompatible with the
   * existing one in OpenBSD and Freedesktop's libbsd (the former having existed
   * for over ten years). Despite this incompatibility being reported during
   * development (see http://gnats.netbsd.org/44977) they still shipped it.
   * Even more unfortunately FreeBSD and later macOS picked up this incompatible
   * implementation.
   *
   * Provide both implementations and default for now on the historical one to
   * avoid breakage, we will switch to the NetBSD one in libbsd 0.10.0 or so.
   *
   * OpenBSD, 2001: strnvis(char *dst, const char *src, size_t dlen, int flag);
   * NetBSD: 2012,  strnvis(char *dst, size_t dlen, const char *src, int flag);
   */
  int
  strnvis_openbsd(char *, const char *, size_t, int);
  int
  strnvis_openbsd(char *mbdst, const char *mbsrc, size_t dlen, int flags)
  {
  	return istrsenvisxl(mbdst, &dlen, mbsrc, flags, "", NULL);
  }
  libbsd_symver_default(strnvis, strnvis_openbsd, LIBBSD_0.2);
  
  int
  strnvis_netbsd(char *, size_t, const char *, int);
  int
  strnvis_netbsd(char *mbdst, size_t dlen, const char *mbsrc, int flags)
  {
  	return istrsenvisxl(mbdst, &dlen, mbsrc, flags, "", NULL);
  }
  libbsd_symver_variant(strnvis, strnvis_netbsd, LIBBSD_0.9.1);
  
  int
  stravis(char **mbdstp, const char *mbsrc, int flags)
  {
  	*mbdstp = NULL;
  	return istrsenvisx(mbdstp, NULL, mbsrc,
  	    mbsrc != NULL ? strlen(mbsrc) : 0, flags, "", NULL);
  }
  
  /*
   * strvisx - visually encode characters from src into dst
   *
   *	Dst must be 4 times the size of src to account for possible
   *	expansion.  The length of dst, not including the trailing NULL,
   *	is returned.
   *
   *	Strvisx encodes exactly len characters from src into dst.
   *	This is useful for encoding a block of data.
   */
  
  int
  strvisx(char *mbdst, const char *mbsrc, size_t len, int flags)
  {
  	return istrsenvisxna(mbdst, NULL, mbsrc, len, flags, "", NULL);
  }
  
  int
  strnvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags)
  {
  	return istrsenvisxna(mbdst, &dlen, mbsrc, len, flags, "", NULL);
  }
  
  int
  strenvisx(char *mbdst, size_t dlen, const char *mbsrc, size_t len, int flags,
      int *cerr_ptr)
  {
  	return istrsenvisxna(mbdst, &dlen, mbsrc, len, flags, "", cerr_ptr);
  }
  

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