text: /*	$NetBSD: chartype.c,v 1.12 2015/02/22 02:16:19 christos Exp $	*/
  
  /*-
   * Copyright (c) 2009 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.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *        This product includes software developed by the NetBSD
   *        Foundation, Inc. and its contributors.
   * 4. Neither the name of The NetBSD Foundation 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 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.
   */
  
  /*
   * chartype.c: character classification and meta information
   */
  #include "config.h"
  #if !defined(lint) && !defined(SCCSID)
  __RCSID("$NetBSD: chartype.c,v 1.12 2015/02/22 02:16:19 christos Exp $");
  #endif /* not lint && not SCCSID */
  #include "el.h"
  #include <stdlib.h>
  
  #define CT_BUFSIZ ((size_t)1024)
  
  #ifdef WIDECHAR
  protected int
  ct_conv_cbuff_resize(ct_buffer_t *conv, size_t csize)
  {
  	void *p;
  
  	if (csize <= conv->csize)
  		return 0;
  
  	conv->csize = csize;
  
  	p = el_realloc(conv->cbuff, conv->csize * sizeof(*conv->cbuff));
  	if (p == NULL) {
  		conv->csize = 0;
  		el_free(conv->cbuff);
  		conv->cbuff = NULL;
  		return -1;
  	}
  	conv->cbuff = p;
  	return 0;
  }
  
  protected int
  ct_conv_wbuff_resize(ct_buffer_t *conv, size_t wsize)
  {
  	void *p;
  
  	if (wsize <= conv->wsize) 
  		return 0;
  
  	conv->wsize = wsize;
  
  	p = el_realloc(conv->wbuff, conv->wsize * sizeof(*conv->wbuff));
  	if (p == NULL) {
  		conv->wsize = 0;
  		el_free(conv->wbuff);
  		conv->wbuff = NULL;
  		return -1;
  	}
  	conv->wbuff = p;
  	return 0;
  }
  
  
  public char *
  ct_encode_string(const Char *s, ct_buffer_t *conv)
  {
  	char *dst;
  	ssize_t used;
  
  	if (!s)
  		return NULL;
  
  	dst = conv->cbuff;
  	for (;;) {
  		used = (ssize_t)(dst - conv->cbuff);
  		if ((conv->csize - (size_t)used) < 5) {
  			if (ct_conv_cbuff_resize(conv,
  			    conv->csize + CT_BUFSIZ) == -1)
  				return NULL;
  			dst = conv->cbuff + used;
  		}
  		if (!*s)
  			break;
  		used = ct_encode_char(dst, (size_t)5, *s);
  		if (used == -1) /* failed to encode, need more buffer space */
  			abort();
  		++s;
  		dst += used;
  	}
  	*dst = '\0';
  	return conv->cbuff;
  }
  
  public Char *
  ct_decode_string(const char *s, ct_buffer_t *conv)
  {
  	size_t len;
  
  	if (!s)
  		return NULL;
  
  	len = ct_mbstowcs(NULL, s, (size_t)0);
  	if (len == (size_t)-1)
  		return NULL;
  
  	if (conv->wsize < ++len)
  		if (ct_conv_wbuff_resize(conv, len + CT_BUFSIZ) == -1)
  			return NULL;
  
  	ct_mbstowcs(conv->wbuff, s, conv->wsize);
  	return conv->wbuff;
  }
  
  
  protected Char **
  ct_decode_argv(int argc, const char *argv[], ct_buffer_t *conv)
  {
  	size_t bufspace;
  	int i;
  	Char *p;
  	Char **wargv;
  	ssize_t bytes;
  
  	/* Make sure we have enough space in the conversion buffer to store all
  	 * the argv strings. */
  	for (i = 0, bufspace = 0; i < argc; ++i)
  		bufspace += argv[i] ? strlen(argv[i]) + 1 : 0;
  	if (conv->wsize < ++bufspace)
  		if (ct_conv_wbuff_resize(conv, bufspace + CT_BUFSIZ) == -1)
  			return NULL;
  
  	wargv = el_malloc((size_t)argc * sizeof(*wargv));
  
  	for (i = 0, p = conv->wbuff; i < argc; ++i) {
  		if (!argv[i]) {   /* don't pass null pointers to mbstowcs */
  			wargv[i] = NULL;
  			continue;
  		} else {
  			wargv[i] = p;
  			bytes = (ssize_t)mbstowcs(p, argv[i], bufspace);
  		}
  		if (bytes == -1) {
  			el_free(wargv);
  			return NULL;
  		} else
  			bytes++;  /* include '\0' in the count */
  		bufspace -= (size_t)bytes;
  		p += bytes;
  	}
  
  	return wargv;
  }
  
  
  protected size_t
  ct_enc_width(Char c)
  {
  	/* UTF-8 encoding specific values */
  	if (c < 0x80)
  		return 1;
  	else if (c < 0x0800)
  		return 2;
  	else if (c < 0x10000)
  		return 3;
  	else if (c < 0x110000)
  		return 4;
  	else
  		return 0; /* not a valid codepoint */
  }
  
  protected ssize_t
  ct_encode_char(char *dst, size_t len, Char c)
  {
  	ssize_t l = 0;
  	if (len < ct_enc_width(c))
  		return -1;
  	l = ct_wctomb(dst, c);
  
  	if (l < 0) {
  		ct_wctomb_reset;
  		l = 0;
  	}
  	return l;
  }
  #endif
  
  protected const Char *
  ct_visual_string(const Char *s)
  {
  	static Char *buff = NULL;
  	static size_t buffsize = 0;
  	void *p;
  	Char *dst;
  	ssize_t used = 0;
  
  	if (!s)
  		return NULL;
  	if (!buff) {
  	    buffsize = CT_BUFSIZ;
  	    buff = el_malloc(buffsize * sizeof(*buff));
  	}
  	dst = buff;
  	while (*s) {
  		used = ct_visual_char(dst, buffsize - (size_t)(dst - buff), *s);
  		if (used == -1) { /* failed to encode, need more buffer space */
  			used = dst - buff;
  			buffsize += CT_BUFSIZ;
  			p = el_realloc(buff, buffsize * sizeof(*buff));
  			if (p == NULL)
  				goto out;
  			buff = p;
  			dst = buff + used;
  			/* don't increment s here - we want to retry it! */
  		}
  		else
  		    ++s;
  		dst += used;
  	}
  	if (dst >= (buff + buffsize)) { /* sigh */
  		buffsize += 1;
  		p = el_realloc(buff, buffsize * sizeof(*buff));
  		if (p == NULL)
  			goto out;
  		buff = p;
  		dst = buff + buffsize - 1;
  	}
  	*dst = 0;
  	return buff;
  out:
  	el_free(buff);
  	buffsize = 0;
  	return NULL;
  }
  
  
  
  protected int
  ct_visual_width(Char c)
  {
  	int t = ct_chr_class(c);
  	switch (t) {
  	case CHTYPE_ASCIICTL:
  		return 2; /* ^@ ^? etc. */
  	case CHTYPE_TAB:
  		return 1; /* Hmm, this really need to be handled outside! */
  	case CHTYPE_NL:
  		return 0; /* Should this be 1 instead? */
  #ifdef WIDECHAR
  	case CHTYPE_PRINT:
  		return wcwidth(c);
  	case CHTYPE_NONPRINT:
  		if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
  			return 8; /* \U+12345 */
  		else
  			return 7; /* \U+1234 */
  #else
  	case CHTYPE_PRINT:
  		return 1;
  	case CHTYPE_NONPRINT:
  		return 4; /* \123 */
  #endif
  	default:
  		return 0; /* should not happen */
  	}
  }
  
  
  protected ssize_t
  ct_visual_char(Char *dst, size_t len, Char c)
  {
  	int t = ct_chr_class(c);
  	switch (t) {
  	case CHTYPE_TAB:
  	case CHTYPE_NL:
  	case CHTYPE_ASCIICTL:
  		if (len < 2)
  			return -1;   /* insufficient space */
  		*dst++ = '^';
  		if (c == '\177')
  			*dst = '?'; /* DEL -> ^? */
  		else
  			*dst = c | 0100;    /* uncontrolify it */
  		return 2;
  	case CHTYPE_PRINT:
  		if (len < 1)
  			return -1;  /* insufficient space */
  		*dst = c;
  		return 1;
  	case CHTYPE_NONPRINT:
  		/* we only use single-width glyphs for display,
  		 * so this is right */
  		if ((ssize_t)len < ct_visual_width(c))
  			return -1;   /* insufficient space */
  #ifdef WIDECHAR
  		*dst++ = '\\';
  		*dst++ = 'U';
  		*dst++ = '+';
  #define tohexdigit(v) "0123456789ABCDEF"[v]
  		if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
  			*dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf);
  		*dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf);
  		*dst++ = tohexdigit(((unsigned int) c >>  8) & 0xf);
  		*dst++ = tohexdigit(((unsigned int) c >>  4) & 0xf);
  		*dst   = tohexdigit(((unsigned int) c      ) & 0xf);
  		return c > 0xffff ? 8 : 7;
  #else
  		*dst++ = '\\';
  #define tooctaldigit(v) ((v) + '0')
  		*dst++ = tooctaldigit(((unsigned int) c >> 6) & 0x7);
  		*dst++ = tooctaldigit(((unsigned int) c >> 3) & 0x7);
  		*dst++ = tooctaldigit(((unsigned int) c     ) & 0x7);
  #endif
  		/*FALLTHROUGH*/
  	/* these two should be handled outside this function */
  	default:            /* we should never hit the default */
  		return 0;
  	}
  }
  
  
  
  
  protected int
  ct_chr_class(Char c)
  {
  	if (c == '\t')
  		return CHTYPE_TAB;
  	else if (c == '\n')
  		return CHTYPE_NL;
  	else if (IsASCII(c) && Iscntrl(c))
  		return CHTYPE_ASCIICTL;
  	else if (Isprint(c))
  		return CHTYPE_PRINT;
  	else
  		return CHTYPE_NONPRINT;
  }
  