153 lines
3 KiB
C
153 lines
3 KiB
C
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/* buffer.c - Text buffering and word wrapping
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* Copyright (c) 1995-1997 Stefan Jokisch
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*
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* This file is part of Frotz.
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*
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* Frotz is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Frotz is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "frotz.h"
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extern void stream_char (zchar);
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extern void stream_word (const zchar *);
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extern void stream_new_line (void);
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static zchar buffer[TEXT_BUFFER_SIZE];
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static int bufpos = 0;
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static zchar prev_c = 0;
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/*
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* flush_buffer
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*
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* Copy the contents of the text buffer to the output streams.
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*
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*/
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void flush_buffer (void)
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{
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static bool locked = FALSE;
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/* Make sure we stop when flush_buffer is called from flush_buffer.
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Note that this is difficult to avoid as we might print a newline
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during flush_buffer, which might cause a newline interrupt, that
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might execute any arbitrary opcode, which might flush the buffer. */
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if (locked || bufpos == 0)
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return;
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/* Send the buffer to the output streams */
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buffer[bufpos] = 0;
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locked = TRUE;
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stream_word (buffer);
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#ifdef SPEECH_OUTPUT
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os_speech_output(buffer);
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#endif
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locked = FALSE;
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/* Reset the buffer */
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bufpos = 0;
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prev_c = 0;
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}/* flush_buffer */
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/*
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* print_char
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*
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* High level output function.
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*
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*/
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void print_char (zchar c)
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{
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static bool flag = FALSE;
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if (message || ostream_memory || enable_buffering) {
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if (!flag) {
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/* Characters 0 and ZC_RETURN are special cases */
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if (c == ZC_RETURN)
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{ new_line (); return; }
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if (c == 0)
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return;
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/* Flush the buffer before a whitespace or after a hyphen */
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if (c == ' ' || c == ZC_INDENT || c == ZC_GAP || (prev_c == '-' && c != '-'))
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flush_buffer ();
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/* Set the flag if this is part one of a style or font change */
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if (c == ZC_NEW_FONT || c == ZC_NEW_STYLE)
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flag = TRUE;
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/* Remember the current character code */
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prev_c = c;
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} else flag = FALSE;
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/* Insert the character into the buffer */
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buffer[bufpos++] = c;
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if (bufpos == TEXT_BUFFER_SIZE)
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runtime_error (ERR_TEXT_BUF_OVF);
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} else stream_char (c);
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}/* print_char */
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/*
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* new_line
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*
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* High level newline function.
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*
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*/
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void new_line (void)
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{
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flush_buffer (); stream_new_line ();
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}/* new_line */
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/*
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* init_buffer
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*
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* Initialize buffer variables.
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*
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*/
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void init_buffer(void)
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{
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memset(buffer, 0, sizeof (zchar) * TEXT_BUFFER_SIZE);
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bufpos = 0;
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prev_c = 0;
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}
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