82 lines
3.3 KiB
C
82 lines
3.3 KiB
C
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//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: Buffer library //
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// //
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// //
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// Copyright © 2018-2019 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K 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 3 of the License, or //
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// any later version. //
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// //
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// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <extras/buf.h>
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#include <extras/locks.h>
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void BEnableAutoScroll(Buffer_t *buf) { buf->flags |= BF_AUTOSCROLL; }
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void BDisableAutoScroll(Buffer_t *buf) { buf->flags &= ~BF_AUTOSCROLL; }
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error_t BScrollDownBuf(Buffer_t *buf)
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{
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error_t rc;
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assert(buf && buf->initDone == INITOK);
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if (!buf) return EINVAL;
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if (buf->flags & (BF_EOF|BF_ERR)) return EENDF;
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if (buf->state != BS_RDWR && buf->state != BS_WRONLY) {
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return EBADF;
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}
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ExAcquireLock(&buf->lock);
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rc = bscrolldown(buf);
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ExReleaseLock(&buf->lock);
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return rc;
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}
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error_t bscrolldown(Buffer_t *buf)
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{
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size_t bufSize, pbCount;
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assert(buf->wp == buf->buf + buf->size);
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// We give up a whole playback buffer worth
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// of lines so we don't have to do this too often
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// (we make the current buffer a pb one)
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bufSize = buf->nLines * buf->lineLen;
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pbCount = (buf->size / bufSize) - 1;
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// Paranoia check
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assert(buf->size >= (size_t)(buf->nLines * buf->lineLen));
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// If we only have one playback buffer we just give up a line
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if (pbCount == 0) {
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// Use of memcpy() is safe because the source occur
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// after the destination
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memmove(buf->buf, buf->buf + buf->lineLen,
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buf->size - buf->lineLen);
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buf->wp -= buf->lineLen;
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}
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// We do have a playback buffer worth of lines to give up
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else {
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memmove(buf->buf, buf->buf + bufSize,
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buf->size - bufSize);
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buf->wp -= bufSize;
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}
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return EOK;
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}
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