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os-k/kaleid/libbuf/buf.c
2019-04-06 07:53:58 +02:00

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