177 lines
6.6 KiB
C
177 lines
6.6 KiB
C
//----------------------------------------------------------------------------//
|
|
// GNU GPL OS/K //
|
|
// //
|
|
// Desc: Buffer library //
|
|
// //
|
|
// //
|
|
// Copyright © 2018-2020 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/>. //
|
|
//----------------------------------------------------------------------------//
|
|
|
|
#ifndef _EX_LOCK_H
|
|
#include <ex/lock.h>
|
|
#endif
|
|
|
|
#ifndef _LIB_BUF_H
|
|
#define _LIB_BUF_H
|
|
|
|
//
|
|
// Buffer flags
|
|
//
|
|
enum
|
|
{
|
|
BF_TERM = 1, // Terminal buffer
|
|
BF_LINE = 1<<1, // Line-buffered
|
|
BF_FILE = 1<<2, // Linked to a file
|
|
BF_BALLOC = 1<<3, // Buffer structure was malloc'd
|
|
BF_SALLOC = 1<<4, // Internal buffer was malloc'd
|
|
BF_FONCLOSE = 1<<5, // Flush on close
|
|
BF_AUTOSCROLL = 1<<6, // Scroll-down automatically
|
|
|
|
BF_EOF = 1<<7, // End of file reached
|
|
BF_ERR = 1<<8, // An error happened
|
|
};
|
|
|
|
//
|
|
// Buffer states
|
|
//
|
|
enum
|
|
{
|
|
BS_CLOSED = 0, // Buffer closed (need allocation)
|
|
|
|
// Buffer ready for...
|
|
BS_RDWR, // Both reading and writing
|
|
BS_RDONLY, // Only for reading
|
|
BS_WRONLY, // Only for writing
|
|
};
|
|
|
|
typedef struct Buffer_t Buffer_t;
|
|
|
|
//
|
|
// For line/terminal buffers, the flusher by bputc() is called every '\n'
|
|
// For pure buffers, the flusher is called by bputc() after it fills
|
|
// the buffer (unless flush-on-close is enabled)
|
|
//
|
|
// When a buffer is full, if the flusher doesn'tchange buf->wp and bputc()
|
|
// is called again, it will produce a EENDF error and set the BF_EOF flag
|
|
//
|
|
// Unless terminal buffering with auto-scrolldown enabled, nothing is
|
|
// removed from the buffer by the libbuf functions themselves, if you want
|
|
// the buffer to be emptied on flush then do that in the flusher
|
|
//
|
|
typedef error_t (*BFlusher_t)(Buffer_t *);
|
|
|
|
struct Buffer_t
|
|
{
|
|
Lock_t lock;
|
|
|
|
int flags; // Buffer flags
|
|
int state; // Buffer state
|
|
|
|
size_t size; // Current size
|
|
|
|
uchar *buf; // Beginning of buffer
|
|
uchar *rp; // Read pointer
|
|
uchar *wp; // Write pointer
|
|
|
|
BFlusher_t flusher; // See above
|
|
|
|
// The following parameters are only used in terminal buf mode
|
|
|
|
int lastLF; // Characters since beginning of line
|
|
int lineLen; // Line length (for line buffers)
|
|
int nLines; // Number of lines in "true" buffer
|
|
// size/(lineLen*nLines) - 1 playback buffers
|
|
};
|
|
|
|
extern Buffer_t *BStdIn, *BStdOut, *BStdDbg;
|
|
|
|
// For pure buffers only
|
|
void BEnableLineBuffering(Buffer_t *);
|
|
void BDisaleLineBuffering(Buffer_t *);
|
|
|
|
// For terminal buffers only
|
|
error_t BScrollDownBuf(Buffer_t *);
|
|
void BEnableAutoScroll(Buffer_t *);
|
|
void BDisableAutoScroll(Buffer_t *);
|
|
//
|
|
// Buffer creation functions
|
|
//
|
|
// 'source' is the internal buffer, if you want
|
|
// to give it yourself
|
|
//
|
|
// If source==NULL, malloc's the buffer
|
|
// If *pbuf==NULL, malloc's the structure (Ex's only)
|
|
// BCloseBuf() handles the de-allocations
|
|
//
|
|
error_t BCloseBuf(Buffer_t *);
|
|
|
|
// Creates a pure buffer of a given size
|
|
error_t BOpenPureBuf(Buffer_t **pbuf, int mode, size_t size);
|
|
error_t BOpenPureBufEx(Buffer_t **, char *source, int mode, size_t,
|
|
BFlusher_t);
|
|
|
|
// Creates a terminal buffer of pbCount*nLines lines each
|
|
// of lineLen length (pb = playback buffer, for scrolling up)
|
|
error_t BOpenTermBuf(Buffer_t **pbuf, int mode,
|
|
int lineLen, int nLines, int pbCount);
|
|
error_t BOpenTermBufEx(Buffer_t **pbuf, char *source, int mode,
|
|
int lineLen, int nLines, int pbCount, BFlusher_t);
|
|
|
|
int BGetFlags(Buffer_t *);
|
|
int BGetState(Buffer_t *);
|
|
|
|
error_t BFlushBuf(Buffer_t *);
|
|
|
|
error_t BPutOnBuf(Buffer_t *, uchar);
|
|
error_t BGetFromBuf(Buffer_t *, uchar *);
|
|
|
|
// The following functions return the number of bytes written to the buffer
|
|
size_t BWriteOnBuf(Buffer_t *, uchar *, size_t);
|
|
size_t BPrintOnBuf(Buffer_t *, const char *, ...);
|
|
size_t BPrintOnBufV(Buffer_t *, const char *, va_list);
|
|
|
|
// The following functions return the number of elements from their
|
|
// va_list's their wrote too, e.g. successful bscanf("%d %d", &a, &b) == 2
|
|
size_t BReadFromBuf(Buffer_t *, uchar *, size_t);
|
|
size_t BScanFromBuf(Buffer_t *, const char *, ...);
|
|
size_t BScanFromBufV(Buffer_t *, const char *, va_list);
|
|
|
|
void BLockBuf(Buffer_t *);
|
|
void BUnlockBuf(Buffer_t *);
|
|
bool BTrylockBuf(Buffer_t *);
|
|
|
|
//
|
|
// Non-locking functions, also perform less checks
|
|
// Only use when not caring about locks, or between BLockBuf()/BUnlockBuf()
|
|
//
|
|
|
|
error_t bputc(Buffer_t *, uchar);
|
|
size_t bwrite(Buffer_t *, uchar *, size_t);
|
|
size_t bprintf(Buffer_t *, const char *, ...);
|
|
size_t vbprintf(Buffer_t *, const char *, va_list);
|
|
|
|
error_t bgetc(Buffer_t *, uchar *);
|
|
size_t bread(Buffer_t *, uchar *, size_t);
|
|
size_t bscanf(Buffer_t *, size_t *, const char *, ...);
|
|
size_t vbscanf(Buffer_t *, size_t *, const char *, va_list);
|
|
|
|
error_t bemptybuf(Buffer_t *);
|
|
error_t bscrolldown(Buffer_t *);
|
|
|
|
#endif
|