quakeforge/libs/console/buffer.c

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/*
buffer.c
console buffer support
Copyright (C) 2001 BillCurrie <bill@taniwha.org>
Author: BillCurrie <bill@taniwha.org>
Date: 2001/09/28
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include "string.h"
#endif
#ifdef HAVE_STRINGS_H
# include "strings.h"
#endif
#include <stdlib.h>
#include "QF/console.h"
VISIBLE con_buffer_t *
Con_CreateBuffer (size_t buffer_size, int max_lines)
{
con_buffer_t *buffer;
if (!(buffer = malloc (sizeof (con_buffer_t))))
return 0;
if (!(buffer->buffer = malloc (buffer_size)))
goto err;
buffer->buffer_size = buffer_size;
if (!(buffer->lines = calloc (max_lines, sizeof (con_line_t))))
goto err;
buffer->max_lines = max_lines;
buffer->num_lines = 1;
buffer->cur_line = 0;
buffer->lines[0].text = buffer->buffer;
return buffer;
err:
if (buffer->buffer)
free (buffer->buffer);
free (buffer);
return 0;
}
VISIBLE void
Con_DestroyBuffer (con_buffer_t *buffer)
{
free (buffer->buffer);
free (buffer->lines);
free (buffer);
}
VISIBLE void
Con_BufferAddText (con_buffer_t *buf, const char *text)
{
con_line_t *cur_line = &buf->lines[buf->cur_line];
con_line_t *tail_line;
size_t len = strlen (text);
byte *pos = cur_line->text + cur_line->len;
if (pos >= buf->buffer + buf->buffer_size)
pos -= buf->buffer_size;
tail_line = buf->lines + (buf->cur_line + buf->max_lines + 1
- buf->num_lines) % buf->max_lines;
if (len > buf->buffer_size) {
text += len - buf->buffer_size;
len = buf->buffer_size;
}
while (len--) {
byte c = *pos++ = *text++;
if (pos >= buf->buffer + buf->buffer_size)
pos = buf->buffer;
cur_line->len++;
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if (pos == tail_line->text) {
if (buf->num_lines > 0)
buf->num_lines--;
tail_line->text = 0;
tail_line->len = 0;
tail_line++;
if (tail_line - buf->lines >= buf->max_lines)
tail_line = buf->lines;
}
if (c == '\n') {
if (buf->num_lines < buf->max_lines)
buf->num_lines++;
cur_line++;
buf->cur_line++;
if (cur_line - buf->lines >= buf->max_lines)
cur_line = buf->lines;
cur_line->text = pos;
cur_line->len = 0;
}
}
buf->cur_line %= buf->max_lines;
}