mirror of
https://gitlab.os-k.eu/os-k-team/os-k.git
synced 2023-08-25 14:03:10 +02:00
86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
//----------------------------------------------------------------------------//
|
|
// GNU GPL OS/K //
|
|
// //
|
|
// Desc: Buffer library //
|
|
// //
|
|
// //
|
|
// Copyright © 2018-2019 The OS/K Team //
|
|
// //
|
|
// This file is part of OS/K. //
|
|
// //
|
|
// OS/K 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 3 of the License, or //
|
|
// any later version. //
|
|
// //
|
|
// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
|
|
//----------------------------------------------------------------------------//
|
|
|
|
#include <lib/buf.h>
|
|
|
|
#ifdef _KALEID_KERNEL
|
|
#include <ke/time.h>
|
|
#endif
|
|
|
|
error_t BGetFromBuf(Buffer_t *buf, uchar *ch)
|
|
{
|
|
error_t rc;
|
|
|
|
if (!buf) return EINVAL;
|
|
if (buf->flags & BF_TERM) return EBADF;
|
|
if (buf->state != BS_RDWR && buf->state != BS_RDONLY) {
|
|
return EBADF;
|
|
}
|
|
|
|
ExAcquireLock(&buf->lock);
|
|
rc = bgetc(buf, ch);
|
|
ExReleaseLock(&buf->lock);
|
|
return rc;
|
|
}
|
|
error_t bgetc(Buffer_t *buf, uchar *ch)
|
|
{
|
|
error_t rc = EOK;
|
|
|
|
if (buf->flags & (BF_EOF|BF_ERR)) return EENDF;
|
|
|
|
assert(!(buf->rp > buf->wp)); // Shouldn't be possible right now
|
|
|
|
if (buf->rp == buf->buf + buf->size) {
|
|
buf->flags |= BF_EOF;
|
|
return EENDF;
|
|
}
|
|
|
|
// Are there things to read at all?
|
|
if (buf->rp < buf->wp) {
|
|
*ch = *buf->rp++;
|
|
return EOK;
|
|
}
|
|
|
|
// We need to fill the buffer
|
|
else {
|
|
// We need a BFiller_t
|
|
// For now we wait until something is in there
|
|
// (so that BStdIn works; don't make anything else)
|
|
while (buf->rp >= buf->wp) {
|
|
#ifdef _KALEID_KERNEL
|
|
KeSleep(1); // XXX synchronization with keyboard driver
|
|
#endif
|
|
}
|
|
|
|
*ch = *buf->rp++;
|
|
}
|
|
|
|
if (rc != EOK) {
|
|
// buf->flags |= BF_ERR;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|