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92 lines
3.3 KiB
C
92 lines
3.3 KiB
C
//----------------------------------------------------------------------------//
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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 © 2018-2020 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 <lib/buf.h>
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#ifdef _KALEID_KERNEL
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#include <ke/time.h>
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#endif
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error_t BGetFromBuf(Buffer_t *buf, uchar *ch)
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{
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error_t rc;
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if (!buf) return EINVAL;
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if (buf->flags & BF_TERM) return EBADF;
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if (buf->state != BS_RDWR && buf->state != BS_RDONLY) {
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return EBADF;
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}
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ExAcquireLock(&buf->lock);
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rc = bgetc(buf, ch);
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ExReleaseLock(&buf->lock);
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return rc;
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}
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// Note: any change to this must be done while
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// keeping in mind vbscanf()'s workaround for ungetc()
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error_t bgetc(Buffer_t *buf, uchar *ch)
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{
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error_t rc = EOK;
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if (buf->flags & (BF_EOF|BF_ERR)) return EENDF;
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assert(!(buf->rp > buf->wp)); // Shouldn't be possible right now
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if (buf->rp == buf->buf + buf->size) {
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buf->flags |= BF_EOF;
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return EENDF;
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}
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// Are there things to read at all?
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if (buf->rp < buf->wp) {
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*ch = *buf->rp++;
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return EOK;
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}
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// We need to fill the buffer
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else {
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// We need a BFiller_t
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// For now we wait until something is in there
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// (so that BStdIn works; don't make anything else)
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while (buf->rp >= buf->wp) {
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#ifdef _KALEID_KERNEL
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KeSleep(1); // XXX synchronization with keyboard driver
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#else
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buf->flags |= BF_EOF;
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return EENDF; // Currently empty
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#endif
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}
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*ch = *buf->rp++;
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}
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if (rc != EOK) {
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// buf->flags |= BF_ERR;
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}
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return rc;
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}
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