655 lines
16 KiB
C
655 lines
16 KiB
C
/* $XTermId: ptydata.c,v 1.121 2019/09/18 23:28:41 tom Exp $ */
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/*
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* Copyright 1999-2018,2019 by Thomas E. Dickey
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*
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* All Rights Reserved
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name(s) of the above copyright
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* holders shall not be used in advertising or otherwise to promote the
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* sale, use or other dealings in this Software without prior written
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* authorization.
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*/
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#include <data.h>
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#if OPT_WIDE_CHARS
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#include <menu.h>
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#include <wcwidth.h>
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#endif
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/*
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* Check for both EAGAIN and EWOULDBLOCK, because some supposedly POSIX
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* systems are broken and return EWOULDBLOCK when they should return EAGAIN.
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* Note that this macro may evaluate its argument more than once.
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*/
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#if defined(EAGAIN) && defined(EWOULDBLOCK)
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#define E_TEST(err) ((err) == EAGAIN || (err) == EWOULDBLOCK)
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#else
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#ifdef EAGAIN
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#define E_TEST(err) ((err) == EAGAIN)
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#else
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#define E_TEST(err) ((err) == EWOULDBLOCK)
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#endif
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#endif
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#if OPT_WIDE_CHARS
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/*
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* Convert the 8-bit codes in data->buffer[] into Unicode in data->utf_data.
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* The number of bytes converted will be nonzero iff there is data.
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*/
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Bool
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decodeUtf8(TScreen *screen, PtyData *data)
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{
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int i;
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int length = (int) (data->last - data->next);
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int utf_count = 0;
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unsigned utf_char = 0;
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data->utf_size = 0;
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for (i = 0; i < length; i++) {
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unsigned c = data->next[i];
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/* Combine UTF-8 into Unicode */
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if (c < 0x80) {
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/* We received an ASCII character */
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if (utf_count > 0) {
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data->utf_data = UCS_REPL; /* prev. sequence incomplete */
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data->utf_size = i;
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} else {
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data->utf_data = (IChar) c;
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data->utf_size = 1;
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}
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break;
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} else if (screen->vt100_graphics
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&& (c < 0x100)
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&& (utf_count == 0)
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&& screen->gsets[(int) screen->curgr] != nrc_ASCII) {
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data->utf_data = (IChar) c;
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data->utf_size = 1;
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break;
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} else if (c < 0xc0) {
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/* We received a continuation byte */
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if (utf_count < 1) {
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/*
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* We received a continuation byte before receiving a sequence
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* state. Or an attempt to use a C1 control string. Either
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* way, it is mapped to the replacement character, unless
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* allowed by optional feature.
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*/
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data->utf_data = (IChar) (screen->c1_printable ? c : UCS_REPL);
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data->utf_size = (i + 1);
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break;
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} else {
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/* Check for overlong UTF-8 sequences for which a shorter
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* encoding would exist and replace them with UCS_REPL.
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* An overlong UTF-8 sequence can have any of the following
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* forms:
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* 1100000x 10xxxxxx
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* 11100000 100xxxxx 10xxxxxx
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* 11110000 1000xxxx 10xxxxxx 10xxxxxx
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* 11111000 10000xxx 10xxxxxx 10xxxxxx 10xxxxxx
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* 11111100 100000xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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*/
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if (!utf_char && !((c & 0x7f) >> (7 - utf_count))) {
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utf_char = UCS_REPL;
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}
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utf_char <<= 6;
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utf_char |= (c & 0x3f);
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if ((utf_char >= 0xd800 &&
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utf_char <= 0xdfff) ||
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(utf_char == 0xfffe) ||
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(utf_char == HIDDEN_CHAR)) {
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utf_char = UCS_REPL;
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}
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utf_count--;
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if (utf_count == 0) {
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#if !OPT_WIDER_ICHAR
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/* characters outside UCS-2 become UCS_REPL */
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if (utf_char > NARROW_ICHAR) {
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TRACE(("using replacement for %#x\n", utf_char));
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utf_char = UCS_REPL;
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}
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#endif
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data->utf_data = (IChar) utf_char;
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data->utf_size = (i + 1);
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break;
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}
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}
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} else {
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/* We received a sequence start byte */
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if (utf_count > 0) {
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data->utf_data = UCS_REPL; /* prev. sequence incomplete */
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data->utf_size = (i + 1);
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break;
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}
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if (c < 0xe0) {
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utf_count = 1;
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utf_char = (c & 0x1f);
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if (!(c & 0x1e)) {
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utf_char = UCS_REPL; /* overlong sequence */
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}
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} else if (c < 0xf0) {
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utf_count = 2;
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utf_char = (c & 0x0f);
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} else if (c < 0xf8) {
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utf_count = 3;
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utf_char = (c & 0x07);
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} else if (c < 0xfc) {
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utf_count = 4;
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utf_char = (c & 0x03);
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} else if (c < 0xfe) {
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utf_count = 5;
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utf_char = (c & 0x01);
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} else {
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data->utf_data = UCS_REPL;
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data->utf_size = (i + 1);
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break;
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}
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}
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}
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#if OPT_TRACE > 1
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TRACE(("UTF-8 char %04X [%d..%d]\n",
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data->utf_data,
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(int) (data->next - data->buffer),
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(int) (data->next - data->buffer + data->utf_size - 1)));
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#endif
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return (data->utf_size != 0);
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}
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#endif
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int
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readPtyData(XtermWidget xw, PtySelect * select_mask, PtyData *data)
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{
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TScreen *screen = TScreenOf(xw);
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int size = 0;
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#ifdef VMS
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if (*select_mask & pty_mask) {
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trimPtyData(xw, data);
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if (read_queue.flink != 0) {
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size = tt_read(data->next);
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if (size == 0) {
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Panic("input: read returned zero\n", 0);
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}
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} else {
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sys$hiber();
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}
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}
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#else /* !VMS */
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if (FD_ISSET(screen->respond, select_mask)) {
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int save_err;
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trimPtyData(xw, data);
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size = (int) read(screen->respond, (char *) data->last, (size_t) FRG_SIZE);
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save_err = errno;
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#if (defined(i386) && defined(SVR4) && defined(sun)) || defined(__CYGWIN__)
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/*
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* Yes, I know this is a majorly f*ugly hack, however it seems to
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* be necessary for Solaris x86. DWH 11/15/94
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* Dunno why though..
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* (and now CYGWIN, alanh@xfree86.org 08/15/01
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*/
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if (size <= 0) {
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if (save_err == EIO || save_err == 0)
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NormalExit();
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else if (!E_TEST(save_err))
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Panic("input: read returned unexpected error (%d)\n", save_err);
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size = 0;
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}
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#else /* !f*ugly */
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if (size < 0) {
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if (save_err == EIO)
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NormalExit();
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else if (!E_TEST(save_err))
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Panic("input: read returned unexpected error (%d)\n", save_err);
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size = 0;
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} else if (size == 0) {
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#if defined(__FreeBSD__) || defined(__OpenBSD__)
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NormalExit();
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#else
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Panic("input: read returned zero\n", 0);
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#endif
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}
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#endif /* f*ugly */
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}
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#endif /* VMS */
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if (size) {
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#if OPT_TRACE
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int i;
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TRACE(("read %d bytes from pty\n", size));
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for (i = 0; i < size; i++) {
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if (!(i % 16))
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TRACE(("%s", i ? "\n " : "READ"));
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TRACE((" %02X", data->last[i]));
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}
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TRACE(("\n"));
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#endif
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data->last += size;
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#ifdef ALLOWLOGGING
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TScreenOf(term)->logstart = VTbuffer->next;
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#endif
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}
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return (size);
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}
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/*
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* Return the next value from the input buffer. Note that morePtyData() is
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* always called before this function, so we can do the UTF-8 input conversion
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* in that function and simply return the result here.
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*/
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#if OPT_WIDE_CHARS
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IChar
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nextPtyData(TScreen *screen, PtyData *data)
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{
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IChar result;
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if (screen->utf8_inparse) {
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skipPtyData(data, result);
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} else {
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result = *((data)->next++);
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if (!screen->output_eight_bits) {
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result = (IChar) (result & 0x7f);
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}
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}
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TRACE2(("nextPtyData returns %#x\n", result));
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return result;
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}
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#endif
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#if OPT_WIDE_CHARS
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/*
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* Called when UTF-8 mode has been turned on/off.
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*/
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void
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switchPtyData(TScreen *screen, int flag)
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{
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if (screen->utf8_mode != flag) {
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screen->utf8_mode = flag;
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screen->utf8_inparse = (Boolean) (flag != 0);
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mk_wcwidth_init(screen->utf8_mode);
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TRACE(("turning UTF-8 mode %s\n", BtoS(flag)));
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update_font_utf8_mode();
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}
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}
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#endif
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/*
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* Allocate a buffer.
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*/
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void
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initPtyData(PtyData **result)
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{
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PtyData *data;
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TRACE(("initPtyData given minBufSize %d, maxBufSize %d\n",
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FRG_SIZE, BUF_SIZE));
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if (FRG_SIZE < 64)
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FRG_SIZE = 64;
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if (BUF_SIZE < FRG_SIZE)
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BUF_SIZE = FRG_SIZE;
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if (BUF_SIZE % FRG_SIZE)
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BUF_SIZE = BUF_SIZE + FRG_SIZE - (BUF_SIZE % FRG_SIZE);
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TRACE(("initPtyData using minBufSize %d, maxBufSize %d\n",
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FRG_SIZE, BUF_SIZE));
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data = TypeXtMallocX(PtyData, (BUF_SIZE + FRG_SIZE));
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memset(data, 0, sizeof(*data));
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data->next = data->buffer;
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data->last = data->buffer;
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*result = data;
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}
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/*
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* Initialize a buffer for the caller, using its data in 'next'.
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*/
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#if OPT_WIDE_CHARS
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PtyData *
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fakePtyData(PtyData *result, Char *next, Char *last)
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{
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PtyData *data = result;
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memset(data, 0, sizeof(*data));
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data->next = next;
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data->last = last;
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return data;
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}
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#endif
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/*
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* Remove used data by shifting the buffer down, to make room for more data,
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* e.g., a continuation-read.
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*/
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void
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trimPtyData(XtermWidget xw GCC_UNUSED, PtyData *data)
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{
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FlushLog(xw);
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if (data->next != data->buffer) {
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int i;
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int n = (int) (data->last - data->next);
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TRACE(("shifting buffer down by %d\n", n));
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for (i = 0; i < n; ++i) {
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data->buffer[i] = data->next[i];
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}
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data->next = data->buffer;
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data->last = data->next + n;
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}
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}
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/*
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* Insert new data into the input buffer so the next calls to morePtyData()
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* and nextPtyData() will return that.
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*/
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void
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fillPtyData(XtermWidget xw, PtyData *data, const char *value, int length)
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{
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int size;
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int n;
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/* remove the used portion of the buffer */
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trimPtyData(xw, data);
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VTbuffer->last += length;
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size = (int) (VTbuffer->last - VTbuffer->next);
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/* shift the unused portion up to make room */
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for (n = size; n >= length; --n)
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VTbuffer->next[n] = VTbuffer->next[n - length];
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/* insert the new bytes to interpret */
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for (n = 0; n < length; n++)
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VTbuffer->next[n] = CharOf(value[n]);
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}
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#if OPT_WIDE_CHARS
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/*
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* Convert an ISO-8859-1 code 'c' to UTF-8, storing the result in the target
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* 'lp', and returning a pointer past the converted character.
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*/
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Char *
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convertToUTF8(Char *lp, unsigned c)
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{
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#define CH(n) (Char)((c) >> ((n) * 8))
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if (c < 0x80) {
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/* 0******* */
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*lp++ = (Char) CH(0);
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} else if (c < 0x800) {
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/* 110***** 10****** */
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*lp++ = (Char) (0xc0 | (CH(0) >> 6) | ((CH(1) & 0x07) << 2));
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*lp++ = (Char) (0x80 | (CH(0) & 0x3f));
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} else if (c < 0x00010000) {
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/* 1110**** 10****** 10****** */
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*lp++ = (Char) (0xe0 | ((int) (CH(1) & 0xf0) >> 4));
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*lp++ = (Char) (0x80 | (CH(0) >> 6) | ((CH(1) & 0x0f) << 2));
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*lp++ = (Char) (0x80 | (CH(0) & 0x3f));
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} else if (c < 0x00200000) {
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*lp++ = (Char) (0xf0 | ((int) (CH(2) & 0x1f) >> 2));
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*lp++ = (Char) (0x80 |
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((int) (CH(1) & 0xf0) >> 4) |
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((int) (CH(2) & 0x03) << 4));
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*lp++ = (Char) (0x80 | (CH(0) >> 6) | ((CH(1) & 0x0f) << 2));
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*lp++ = (Char) (0x80 | (CH(0) & 0x3f));
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} else if (c < 0x04000000) {
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*lp++ = (Char) (0xf8 | (CH(3) & 0x03));
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*lp++ = (Char) (0x80 | (CH(2) >> 2));
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*lp++ = (Char) (0x80 |
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((int) (CH(1) & 0xf0) >> 4) |
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((int) (CH(2) & 0x03) << 4));
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*lp++ = (Char) (0x80 | (CH(0) >> 6) | ((CH(1) & 0x0f) << 2));
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*lp++ = (Char) (0x80 | (CH(0) & 0x3f));
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} else {
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*lp++ = (Char) (0xfc | ((int) (CH(3) & 0x40) >> 6));
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*lp++ = (Char) (0x80 | (CH(3) & 0x3f));
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*lp++ = (Char) (0x80 | (CH(2) >> 2));
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*lp++ = (Char) (0x80 | (CH(1) >> 4) | ((CH(2) & 0x03) << 4));
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*lp++ = (Char) (0x80 | (CH(0) >> 6) | ((CH(1) & 0x0f) << 2));
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*lp++ = (Char) (0x80 | (CH(0) & 0x3f));
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}
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return lp;
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#undef CH
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}
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/*
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* Convert a UTF-8 multibyte character to an Unicode value, returning a pointer
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* past the converted UTF-8 input. The first 256 values align with ISO-8859-1,
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* making it possible to use this to convert to Latin-1.
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*
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* If the conversion fails, return null.
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*/
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Char *
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convertFromUTF8(Char *lp, unsigned *cp)
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{
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int want;
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/*
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* Find the number of bytes we will need from the source.
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*/
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if ((*lp & 0x80) == 0) {
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want = 1;
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} else if ((*lp & 0xe0) == 0xc0) {
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want = 2;
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} else if ((*lp & 0xf0) == 0xe0) {
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want = 3;
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} else if ((*lp & 0xf8) == 0xf0) {
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want = 4;
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} else if ((*lp & 0xfc) == 0xf8) {
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want = 5;
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} else if ((*lp & 0xfe) == 0xfc) {
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want = 6;
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} else {
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want = 0;
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}
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if (want) {
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int have = 1;
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while (lp[have] != '\0') {
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if ((lp[have] & 0xc0) != 0x80)
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break;
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++have;
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}
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if (want == have) {
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unsigned mask = 0;
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int j;
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int shift = 0;
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*cp = 0;
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switch (want) {
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case 1:
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mask = (*lp);
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break;
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case 2:
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mask = (*lp & 0x1f);
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break;
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case 3:
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mask = (*lp & 0x0f);
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break;
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case 4:
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mask = (*lp & 0x07);
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break;
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case 5:
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mask = (*lp & 0x03);
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break;
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case 6:
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mask = (*lp & 0x01);
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break;
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default:
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mask = 0;
|
|
break;
|
|
}
|
|
|
|
for (j = 1; j < want; j++) {
|
|
*cp |= (unsigned) ((lp[want - j] & 0x3f) << shift);
|
|
shift += 6;
|
|
}
|
|
*cp |= mask << shift;
|
|
lp += want;
|
|
} else {
|
|
*cp = BAD_ASCII;
|
|
lp = NULL;
|
|
}
|
|
} else {
|
|
*cp = BAD_ASCII;
|
|
lp = NULL;
|
|
}
|
|
return lp;
|
|
}
|
|
|
|
/*
|
|
* Returns true if the entire string is valid UTF-8.
|
|
*/
|
|
Boolean
|
|
isValidUTF8(Char *lp)
|
|
{
|
|
Boolean result = True;
|
|
while (*lp) {
|
|
unsigned ch;
|
|
Char *next = convertFromUTF8(lp, &ch);
|
|
if (next == NULL || ch == 0) {
|
|
result = False;
|
|
break;
|
|
}
|
|
lp = next;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Write data back to the PTY
|
|
*/
|
|
void
|
|
writePtyData(int f, IChar *d, unsigned len)
|
|
{
|
|
unsigned n = (len << 1);
|
|
|
|
if (VTbuffer->write_len <= len) {
|
|
VTbuffer->write_len = n;
|
|
VTbuffer->write_buf = (Char *) XtRealloc((char *)
|
|
VTbuffer->write_buf, VTbuffer->write_len);
|
|
}
|
|
|
|
for (n = 0; n < len; n++)
|
|
VTbuffer->write_buf[n] = (Char) d[n];
|
|
|
|
TRACE(("writePtyData %d:%s\n", n,
|
|
visibleChars(VTbuffer->write_buf, n)));
|
|
v_write(f, VTbuffer->write_buf, n);
|
|
}
|
|
#endif /* OPT_WIDE_CHARS */
|
|
|
|
#ifdef NO_LEAKS
|
|
void
|
|
noleaks_ptydata(void)
|
|
{
|
|
if (VTbuffer != 0) {
|
|
#if OPT_WIDE_CHARS
|
|
if (VTbuffer->write_buf != 0)
|
|
free(VTbuffer->write_buf);
|
|
#endif
|
|
free(VTbuffer);
|
|
VTbuffer = 0;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef TEST_PTYDATA
|
|
void
|
|
test_ptydata(XtermWidget xw)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
unsigned code;
|
|
PtyData *data;
|
|
Char *next;
|
|
|
|
for (code = 0; code < 256; code++) {
|
|
initPtyData(&data);
|
|
next = convertToUTF8(data->buffer, code);
|
|
*next = 0;
|
|
data->next = data->buffer;
|
|
data->last = next;
|
|
decodeUtf8(screen, data);
|
|
TRACE(("TEST %04X (%d:%s) ->%04X\n", code,
|
|
(int) (next - data->buffer),
|
|
data->buffer,
|
|
data->utf_data));
|
|
if (code != data->utf_data) {
|
|
fprintf(stderr, "Mismatch: %04X vs %04X\n", code, data->utf_data);
|
|
}
|
|
free(data);
|
|
}
|
|
}
|
|
#endif /* TEST_PTYDATA */
|
|
|
|
#ifdef TEST_UTF8_CONVERT
|
|
void
|
|
test_utf8_convert(void)
|
|
{
|
|
unsigned c_in, c_out;
|
|
Char buffer[10];
|
|
Char *result;
|
|
unsigned limit = 1 << 24;
|
|
unsigned success = 0;
|
|
unsigned bucket[256];
|
|
|
|
memset(bucket, 0, sizeof(bucket));
|
|
for (c_in = 0; c_in < limit; ++c_in) {
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if ((result = convertToUTF8(buffer, c_in)) == 0) {
|
|
TRACE(("conversion of U+%04X to UTF-8 failed\n", c_in));
|
|
} else {
|
|
if ((result = convertFromUTF8(buffer, &c_out)) == 0) {
|
|
TRACE(("conversion of U+%04X from UTF-8 failed\n", c_in));
|
|
} else if (c_in != c_out) {
|
|
TRACE(("conversion of U+%04X to/from UTF-8 gave U+%04X\n",
|
|
c_in, c_out));
|
|
} else {
|
|
while (result-- != buffer) {
|
|
bucket[*result]++;
|
|
}
|
|
++success;
|
|
}
|
|
}
|
|
}
|
|
TRACE(("test_utf8_convert: %u/%u successful\n", success, limit));
|
|
for (c_in = 0; c_in < 256; ++c_in) {
|
|
if ((c_in % 8) == 0) {
|
|
TRACE((" %02X:", c_in));
|
|
}
|
|
TRACE((" %8X", bucket[c_in]));
|
|
if (((c_in + 1) % 8) == 0) {
|
|
TRACE(("\n"));
|
|
}
|
|
}
|
|
}
|
|
#endif
|