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/*
* buffer.c
*
* Text buffering and word wrapping
*
*/
#include "frotz.h"
extern void stream_char (zchar);
extern void stream_word (const zchar *);
extern void stream_new_line (void);
static zchar buffer[TEXT_BUFFER_SIZE];
static bufpos = 0;
static zchar prev_c = 0;
/*
* flush_buffer
*
* Copy the contents of the text buffer to the output streams.
*
*/
void flush_buffer (void)
{
static bool locked = FALSE;
/* Make sure we stop when flush_buffer is called from flush_buffer.
Note that this is difficult to avoid as we might print a newline
during flush_buffer, which might cause a newline interrupt, that
might execute any arbitrary opcode, which might flush the buffer. */
if (locked || bufpos == 0)
return;
/* Send the buffer to the output streams */
buffer[bufpos] = 0;
locked = TRUE; stream_word (buffer); locked = FALSE;
/* Reset the buffer */
bufpos = 0;
prev_c = 0;
}/* flush_buffer */
/*
* print_char
*
* High level output function.
*
*/
void print_char (zchar c)
{
static bool flag = FALSE;
if (message || ostream_memory || enable_buffering) {
if (!flag) {
/* Characters 0 and ZC_RETURN are special cases */
if (c == ZC_RETURN)
{ new_line (); return; }
if (c == 0)
return;
/* Flush the buffer before a whitespace or after a hyphen */
if (c == ' ' || c == ZC_INDENT || c == ZC_GAP || prev_c == '-' && c != '-')
flush_buffer ();
/* Set the flag if this is part one of a style or font change */
if (c == ZC_NEW_FONT || c == ZC_NEW_STYLE)
flag = TRUE;
/* Remember the current character code */
prev_c = c;
} else flag = FALSE;
/* Insert the character into the buffer */
buffer[bufpos++] = c;
if (bufpos == TEXT_BUFFER_SIZE)
runtime_error ("Text buffer overflow");
} else stream_char (c);
}/* print_char */
/*
* new_line
*
* High level newline function.
*
*/
void new_line (void)
{
flush_buffer (); stream_new_line ();
}/* new_line */
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