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-rw-r--r--src/chartype.c356
1 files changed, 356 insertions, 0 deletions
diff --git a/src/chartype.c b/src/chartype.c
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+/* $NetBSD: chartype.c,v 1.10 2011/08/16 16:25:15 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 1.10 2011/08/16 16:25:15 christos Exp $");
+#endif /* not lint && not SCCSID */
+#include "el.h"
+#include <stdlib.h>
+
+#define CT_BUFSIZ ((size_t)1024)
+
+#ifdef WIDECHAR
+protected void
+ct_conv_buff_resize(ct_buffer_t *conv, size_t mincsize, size_t minwsize)
+{
+ void *p;
+ if (mincsize > conv->csize) {
+ conv->csize = mincsize;
+ p = el_realloc(conv->cbuff, conv->csize * sizeof(*conv->cbuff));
+ if (p == NULL) {
+ conv->csize = 0;
+ el_free(conv->cbuff);
+ conv->cbuff = NULL;
+ } else
+ conv->cbuff = p;
+ }
+
+ if (minwsize > conv->wsize) {
+ conv->wsize = minwsize;
+ p = el_realloc(conv->wbuff, conv->wsize * sizeof(*conv->wbuff));
+ if (p == NULL) {
+ conv->wsize = 0;
+ el_free(conv->wbuff);
+ conv->wbuff = NULL;
+ } else
+ conv->wbuff = p;
+ }
+}
+
+
+public char *
+ct_encode_string(const Char *s, ct_buffer_t *conv)
+{
+ char *dst;
+ ssize_t used = 0;
+
+ if (!s)
+ return NULL;
+ if (!conv->cbuff)
+ ct_conv_buff_resize(conv, CT_BUFSIZ, (size_t)0);
+ if (!conv->cbuff)
+ return NULL;
+
+ dst = conv->cbuff;
+ while (*s) {
+ used = (ssize_t)(conv->csize - (size_t)(dst - conv->cbuff));
+ if (used < 5) {
+ used = dst - conv->cbuff;
+ ct_conv_buff_resize(conv, conv->csize + CT_BUFSIZ,
+ (size_t)0);
+ if (!conv->cbuff)
+ return NULL;
+ dst = conv->cbuff + used;
+ }
+ 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 = 0;
+
+ if (!s)
+ return NULL;
+ if (!conv->wbuff)
+ ct_conv_buff_resize(conv, (size_t)0, CT_BUFSIZ);
+ if (!conv->wbuff)
+ return NULL;
+
+ len = ct_mbstowcs(NULL, s, (size_t)0);
+ if (len == (size_t)-1)
+ return NULL;
+ if (len > conv->wsize)
+ ct_conv_buff_resize(conv, (size_t)0, len + 1);
+ if (!conv->wbuff)
+ 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;
+ ct_conv_buff_resize(conv, (size_t)0, bufspace);
+ if (!conv->wsize)
+ 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;
+}
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