120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
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buffer.c
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console buffer support
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Copyright (C) 2001 BillCurrie <bill@taniwha.org>
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Author: BillCurrie <bill@taniwha.org>
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Date: 2001/09/28
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program 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.
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See the GNU General Public License for more details.
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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:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_STRING_H
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# include "string.h"
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#endif
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#ifdef HAVE_STRINGS_H
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# include "strings.h"
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#endif
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#include <stdlib.h>
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#include "QF/console.h"
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VISIBLE con_buffer_t *
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Con_CreateBuffer (size_t buffer_size, int max_lines)
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{
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con_buffer_t *buffer;
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if (!(buffer = malloc (sizeof (con_buffer_t))))
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return 0;
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if (!(buffer->buffer = malloc (buffer_size)))
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goto err;
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buffer->buffer_size = buffer_size;
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if (!(buffer->lines = calloc (max_lines, sizeof (con_line_t))))
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goto err;
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buffer->max_lines = max_lines;
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buffer->num_lines = 1;
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buffer->cur_line = 0;
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buffer->lines[0].text = buffer->buffer;
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return buffer;
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err:
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if (buffer->buffer)
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free (buffer->buffer);
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free (buffer);
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return 0;
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}
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VISIBLE void
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Con_DestroyBuffer (con_buffer_t *buffer)
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{
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free (buffer->buffer);
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free (buffer->lines);
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free (buffer);
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}
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VISIBLE void
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Con_BufferAddText (con_buffer_t *buf, const char *text)
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{
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con_line_t *cur_line = &buf->lines[buf->cur_line];
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con_line_t *tail_line;
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size_t len = strlen (text);
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byte *pos = cur_line->text + cur_line->len;
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if (pos >= buf->buffer + buf->buffer_size)
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pos -= buf->buffer_size;
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tail_line = buf->lines + (buf->cur_line + buf->max_lines + 1
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- buf->num_lines) % buf->max_lines;
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if (len > buf->buffer_size) {
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text += len - buf->buffer_size;
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len = buf->buffer_size;
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}
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while (len--) {
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byte c = *pos++ = *text++;
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if (pos >= buf->buffer + buf->buffer_size)
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pos = buf->buffer;
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cur_line->len++;
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if (pos == tail_line->text) {
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if (buf->num_lines > 0)
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buf->num_lines--;
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tail_line->text = 0;
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tail_line->len = 0;
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tail_line++;
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if (tail_line - buf->lines >= buf->max_lines)
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tail_line = buf->lines;
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}
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if (c == '\n') {
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if (buf->num_lines < buf->max_lines)
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buf->num_lines++;
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cur_line++;
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buf->cur_line++;
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if (cur_line - buf->lines >= buf->max_lines)
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cur_line = buf->lines;
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cur_line->text = pos;
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cur_line->len = 0;
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}
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}
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buf->cur_line %= buf->max_lines;
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}
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