142 lines
4.5 KiB
C
142 lines
4.5 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 © 2018-2019 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 <kernel/buf.h>
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#include <extras/malloc.h>
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// Straightforward functions
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int BGetFlags(Buffer_t *buf) { return buf->flags; }
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int BGetState(Buffer_t *buf) { return buf->state; }
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int BGetLineLen(Buffer_t *buf) { return buf->lineLen; }
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void BSetLineLen(Buffer_t *buf, int len) { buf->lineLen = len; }
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void BLockBuf(Buffer_t *buf)
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{
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assert(buf && buf->initDone == INITOK);
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ExAcquireLock(&buf->lock);
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}
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void BUnlockBuf(Buffer_t *buf) { ExReleaseLock(&buf->lock); }
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bool BTrylockBuf(Buffer_t *buf) { return ExAttemptLock(&buf->lock); }
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void BFlushOnClose(Buffer_t *buf) { buf->flags |= BF_FONCLOSE; }
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//
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// Closes a buffer, not flushing unless the proper flag is set
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//
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error_t BCloseBuf(Buffer_t *buf)
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{
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assert(buf && buf->initDone == INITOK);
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ExAcquireLock(&buf->lock);
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if (buf->flags & BF_FONCLOSE) {
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BFlushBuf(buf);
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}
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if (buf->flags & BF_ALLOC) {
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free(buf->buf);
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}
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buf->buf = buf->rp = buf->wp = NULL;
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buf->initDone = buf->flags = buf->state = buf->size = 0;
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ExReleaseLock(&buf->lock);
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KalFreeMemory(buf);
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return EOK;
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}
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//
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// Opens a pure text buffer (for WRITING only)
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// If source==NULL, malloc's the internal buffer
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//
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#if 0
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Buffer_t *BOpenPureBuf(char *source, size_t size)
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{
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/*Buffer_t *buf = malloc(sizeof *buf);
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buf->flags = 0;
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ExInitLock(&buf->lock);*/
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return NULL;
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}
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#endif
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extern BFlusher_t _VGA_BFlusher;
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//
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// Creates a lined buffer of (nLines + pbCount*nLines) lines each
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// of lineLen length (pb = playback buffer, for scrolling up)
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//
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Buffer_t *BOpenLineBuf(char *source, int mode,
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int lineLen, int nLines, int pbCount, BFlusher_t flusher)
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{
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assert(lineLen > 0 && nLines > 0 && pbCount >= 0);
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assert(mode == BS_RDWR || mode == BS_RDONLY || mode == BS_WRONLY);
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Buffer_t *buf = malloc(sizeof *buf);
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ExInitLock(&buf->lock, KLOCK_MUTEX);
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ExAcquireLock(&buf->lock);
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buf->lastLF = 0;
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buf->state = mode;
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buf->flags = BF_LINE;
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buf->nLines = nLines;
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buf->lineLen = lineLen;
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buf->size = lineLen * nLines * (pbCount + 1);
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if (source == NULL) {
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buf->buf = calloc(buf->size, 1);
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} else {
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buf->buf = (uchar *)source;
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}
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buf->wp = buf->rp = buf->buf;
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buf->flusher = flusher;
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buf->initDone = INITOK;
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ExReleaseLock(&buf->lock);
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return buf;
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}
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//
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// Flushes a buffer, returns EBADF when not possible
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//
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error_t BFlushBuf(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->flusher || buf->state == BS_EOF || buf->state == BS_ERR) {
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return EBADF;
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}
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ExAcquireLock(&buf->lock);
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rc = buf->flusher(buf);
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ExReleaseLock(&buf->lock);
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return rc;
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} |