357 lines
8.5 KiB
C
357 lines
8.5 KiB
C
/* $NetBSD: chartype.c,v 1.10 2011/08/16 16:25:15 christos Exp $ */
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/*-
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* Copyright (c) 2009 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* chartype.c: character classification and meta information
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*/
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#include "config.h"
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#if !defined(lint) && !defined(SCCSID)
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__RCSID("$NetBSD: chartype.c,v 1.10 2011/08/16 16:25:15 christos Exp $");
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#endif /* not lint && not SCCSID */
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#include "el.h"
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#include <stdlib.h>
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#define CT_BUFSIZ ((size_t)1024)
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#ifdef WIDECHAR
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protected void
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ct_conv_buff_resize(ct_buffer_t *conv, size_t mincsize, size_t minwsize)
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{
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void *p;
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if (mincsize > conv->csize) {
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conv->csize = mincsize;
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p = el_realloc(conv->cbuff, conv->csize * sizeof(*conv->cbuff));
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if (p == NULL) {
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conv->csize = 0;
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el_free(conv->cbuff);
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conv->cbuff = NULL;
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} else
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conv->cbuff = p;
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}
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if (minwsize > conv->wsize) {
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conv->wsize = minwsize;
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p = el_realloc(conv->wbuff, conv->wsize * sizeof(*conv->wbuff));
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if (p == NULL) {
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conv->wsize = 0;
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el_free(conv->wbuff);
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conv->wbuff = NULL;
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} else
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conv->wbuff = p;
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}
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}
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public char *
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ct_encode_string(const Char *s, ct_buffer_t *conv)
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{
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char *dst;
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ssize_t used = 0;
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if (!s)
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return NULL;
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if (!conv->cbuff)
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ct_conv_buff_resize(conv, CT_BUFSIZ, (size_t)0);
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if (!conv->cbuff)
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return NULL;
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dst = conv->cbuff;
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while (*s) {
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used = (ssize_t)(conv->csize - (size_t)(dst - conv->cbuff));
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if (used < 5) {
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used = dst - conv->cbuff;
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ct_conv_buff_resize(conv, conv->csize + CT_BUFSIZ,
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(size_t)0);
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if (!conv->cbuff)
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return NULL;
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dst = conv->cbuff + used;
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}
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used = ct_encode_char(dst, (size_t)5, *s);
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if (used == -1) /* failed to encode, need more buffer space */
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abort();
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++s;
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dst += used;
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}
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*dst = '\0';
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return conv->cbuff;
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}
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public Char *
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ct_decode_string(const char *s, ct_buffer_t *conv)
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{
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size_t len = 0;
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if (!s)
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return NULL;
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if (!conv->wbuff)
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ct_conv_buff_resize(conv, (size_t)0, CT_BUFSIZ);
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if (!conv->wbuff)
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return NULL;
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len = ct_mbstowcs(NULL, s, (size_t)0);
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if (len == (size_t)-1)
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return NULL;
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if (len > conv->wsize)
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ct_conv_buff_resize(conv, (size_t)0, len + 1);
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if (!conv->wbuff)
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return NULL;
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ct_mbstowcs(conv->wbuff, s, conv->wsize);
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return conv->wbuff;
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}
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protected Char **
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ct_decode_argv(int argc, const char *argv[], ct_buffer_t *conv)
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{
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size_t bufspace;
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int i;
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Char *p;
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Char **wargv;
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ssize_t bytes;
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/* Make sure we have enough space in the conversion buffer to store all
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* the argv strings. */
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for (i = 0, bufspace = 0; i < argc; ++i)
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bufspace += argv[i] ? strlen(argv[i]) + 1 : 0;
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ct_conv_buff_resize(conv, (size_t)0, bufspace);
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if (!conv->wsize)
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return NULL;
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wargv = el_malloc((size_t)argc * sizeof(*wargv));
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for (i = 0, p = conv->wbuff; i < argc; ++i) {
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if (!argv[i]) { /* don't pass null pointers to mbstowcs */
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wargv[i] = NULL;
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continue;
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} else {
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wargv[i] = p;
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bytes = (ssize_t)mbstowcs(p, argv[i], bufspace);
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}
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if (bytes == -1) {
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el_free(wargv);
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return NULL;
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} else
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bytes++; /* include '\0' in the count */
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bufspace -= (size_t)bytes;
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p += bytes;
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}
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return wargv;
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}
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protected size_t
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ct_enc_width(Char c)
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{
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/* UTF-8 encoding specific values */
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if (c < 0x80)
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return 1;
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else if (c < 0x0800)
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return 2;
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else if (c < 0x10000)
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return 3;
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else if (c < 0x110000)
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return 4;
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else
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return 0; /* not a valid codepoint */
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}
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protected ssize_t
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ct_encode_char(char *dst, size_t len, Char c)
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{
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ssize_t l = 0;
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if (len < ct_enc_width(c))
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return -1;
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l = ct_wctomb(dst, c);
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if (l < 0) {
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ct_wctomb_reset;
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l = 0;
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}
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return l;
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}
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#endif
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protected const Char *
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ct_visual_string(const Char *s)
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{
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static Char *buff = NULL;
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static size_t buffsize = 0;
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void *p;
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Char *dst;
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ssize_t used = 0;
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if (!s)
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return NULL;
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if (!buff) {
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buffsize = CT_BUFSIZ;
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buff = el_malloc(buffsize * sizeof(*buff));
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}
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dst = buff;
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while (*s) {
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used = ct_visual_char(dst, buffsize - (size_t)(dst - buff), *s);
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if (used == -1) { /* failed to encode, need more buffer space */
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used = dst - buff;
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buffsize += CT_BUFSIZ;
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p = el_realloc(buff, buffsize * sizeof(*buff));
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if (p == NULL)
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goto out;
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buff = p;
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dst = buff + used;
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/* don't increment s here - we want to retry it! */
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}
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else
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++s;
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dst += used;
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}
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if (dst >= (buff + buffsize)) { /* sigh */
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buffsize += 1;
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p = el_realloc(buff, buffsize * sizeof(*buff));
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if (p == NULL)
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goto out;
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buff = p;
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dst = buff + buffsize - 1;
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}
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*dst = 0;
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return buff;
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out:
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el_free(buff);
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buffsize = 0;
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return NULL;
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}
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protected int
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ct_visual_width(Char c)
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{
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int t = ct_chr_class(c);
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switch (t) {
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case CHTYPE_ASCIICTL:
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return 2; /* ^@ ^? etc. */
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case CHTYPE_TAB:
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return 1; /* Hmm, this really need to be handled outside! */
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case CHTYPE_NL:
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return 0; /* Should this be 1 instead? */
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#ifdef WIDECHAR
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case CHTYPE_PRINT:
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return wcwidth(c);
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case CHTYPE_NONPRINT:
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if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
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return 8; /* \U+12345 */
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else
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return 7; /* \U+1234 */
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#else
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case CHTYPE_PRINT:
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return 1;
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case CHTYPE_NONPRINT:
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return 4; /* \123 */
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#endif
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default:
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return 0; /* should not happen */
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}
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}
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protected ssize_t
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ct_visual_char(Char *dst, size_t len, Char c)
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{
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int t = ct_chr_class(c);
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switch (t) {
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case CHTYPE_TAB:
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case CHTYPE_NL:
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case CHTYPE_ASCIICTL:
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if (len < 2)
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return -1; /* insufficient space */
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*dst++ = '^';
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if (c == '\177')
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*dst = '?'; /* DEL -> ^? */
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else
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*dst = c | 0100; /* uncontrolify it */
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return 2;
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case CHTYPE_PRINT:
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if (len < 1)
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return -1; /* insufficient space */
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*dst = c;
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return 1;
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case CHTYPE_NONPRINT:
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/* we only use single-width glyphs for display,
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* so this is right */
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if ((ssize_t)len < ct_visual_width(c))
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return -1; /* insufficient space */
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#ifdef WIDECHAR
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*dst++ = '\\';
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*dst++ = 'U';
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*dst++ = '+';
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#define tohexdigit(v) "0123456789ABCDEF"[v]
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if (c > 0xffff) /* prefer standard 4-byte display over 5-byte */
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*dst++ = tohexdigit(((unsigned int) c >> 16) & 0xf);
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*dst++ = tohexdigit(((unsigned int) c >> 12) & 0xf);
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*dst++ = tohexdigit(((unsigned int) c >> 8) & 0xf);
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*dst++ = tohexdigit(((unsigned int) c >> 4) & 0xf);
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*dst = tohexdigit(((unsigned int) c ) & 0xf);
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return c > 0xffff ? 8 : 7;
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#else
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*dst++ = '\\';
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#define tooctaldigit(v) ((v) + '0')
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*dst++ = tooctaldigit(((unsigned int) c >> 6) & 0x7);
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*dst++ = tooctaldigit(((unsigned int) c >> 3) & 0x7);
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*dst++ = tooctaldigit(((unsigned int) c ) & 0x7);
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#endif
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/*FALLTHROUGH*/
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/* these two should be handled outside this function */
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default: /* we should never hit the default */
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return 0;
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}
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}
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protected int
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ct_chr_class(Char c)
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{
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if (c == '\t')
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return CHTYPE_TAB;
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else if (c == '\n')
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return CHTYPE_NL;
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else if (IsASCII(c) && Iscntrl(c))
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return CHTYPE_ASCIICTL;
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else if (Isprint(c))
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return CHTYPE_PRINT;
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else
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return CHTYPE_NONPRINT;
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}
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