legacy tty driver: share common files with the new implementation

Let's make it easier to keep them in sync for now.

Change-Id: Ic0f1488c7f7da7770db56c25d07fb3ead5e3649e
Reviewed-on: https://review.haiku-os.org/c/1550
Reviewed-by: waddlesplash <[email protected]>

src/add-ons/kernel/drivers/tty/Jamfile

@@ -11,3 +11,6 @@ KernelAddon <driver>tty :
 	slave.cpp
 ;
 
+SEARCH on [ FGristFiles line_buffer.cpp ]
+	+= [ FDirName $(HAIKU_TOP) src add-ons kernel generic tty ] ;
+

src/add-ons/kernel/drivers/tty/line_buffer.cpp

@@ -1,169 +0,0 @@
-/*
- * Copyright 2004, Axel Dörfler, [email protected]. All rights reserved.
- * Distributed under the terms of the MIT License.
- */
-
-
-#include "line_buffer.h"
-
-#include <KernelExport.h>
-#include <stdlib.h>
-
-
-status_t
-clear_line_buffer(struct line_buffer &buffer)
-{
-	buffer.in = 0;
-	buffer.first = 0;
-	return B_OK;
-}
-
-
-status_t
-init_line_buffer(struct line_buffer &buffer, size_t size)
-{
-	clear_line_buffer(buffer);
-	
-	buffer.buffer = (char *)malloc(size);
-	if (buffer.buffer == NULL)
-		return B_NO_MEMORY;
-
-	buffer.size = size;
-
-	return B_OK;
-}
-
-
-status_t
-uninit_line_buffer(struct line_buffer &buffer)
-{
-	free(buffer.buffer);
-	return B_OK;
-}
-
-
-int32
-line_buffer_readable(struct line_buffer &buffer)
-{
-	return buffer.in;
-}
-
-
-int32
-line_buffer_readable_line(struct line_buffer &buffer, char eol, char eof)
-{
-	size_t size = buffer.in;
-	if (size == 0)
-		return 0;
-
-	// find EOL or EOF char
-	for (size_t i = 0; i < size; i++) {
-		char c = buffer.buffer[(buffer.first + i) % buffer.size];
-		if (c == eol || c == '\n' || c == '\r' || c == eof)
-			return i + 1;
-	}
-
-	// If the buffer is full, but doesn't contain a EOL or EOF, we report the
-	// full size anyway, since otherwise the reader would wait forever.
-	return buffer.in == buffer.size ? buffer.in : 0;
-}
-
-
-int32
-line_buffer_writable(struct line_buffer &buffer)
-{
-	return buffer.size - buffer.in;
-}
-
-
-ssize_t
-line_buffer_user_read(struct line_buffer &buffer, char *data, size_t length,
-	char eof, bool* hitEOF)
-{
-	size_t available = buffer.in;
-
-	if (length > available)
-		length = available;
-
-	if (length == 0)
-		return 0;
-
-	// check for EOF, if the caller asked us to
-	if (hitEOF) {
-		*hitEOF = false;
-		for (size_t i = 0; i < available; i++) {
-			char c = buffer.buffer[(buffer.first + i) % buffer.size];
-			if (c == eof) {
-				*hitEOF = true;
-				length = i;
-				break;
-			}
-		}
-	}
-
-	ssize_t bytesRead = length;
-
-	if (buffer.first + length < buffer.size) {
-		// simple copy
-		if (user_memcpy(data, buffer.buffer + buffer.first, length) != B_OK)
-			bytesRead = B_BAD_ADDRESS;
-	} else {
-		// need to copy both ends
-		size_t upper = buffer.size - buffer.first;
-		size_t lower = length - upper;
-
-		if (user_memcpy(data, buffer.buffer + buffer.first, upper) != B_OK
-			|| user_memcpy(data + upper, buffer.buffer, lower) != B_OK)
-			bytesRead = B_BAD_ADDRESS;
-	}
-
-	if (bytesRead > 0) {
-		buffer.first = (buffer.first + bytesRead) % buffer.size;
-		buffer.in -= bytesRead;
-	}
-
-	// dispose of EOF char
-	if (hitEOF && *hitEOF) {
-		buffer.first = (buffer.first + 1) % buffer.size;
-		buffer.in--;
-	}
-
-	return bytesRead;
-}
-
-
-status_t
-line_buffer_putc(struct line_buffer &buffer, char c)
-{
-	if (buffer.in == buffer.size)
-		return B_NO_MEMORY;
-
-	buffer.buffer[(buffer.first + buffer.in++) % buffer.size] = c;
-	return B_OK;
-}
-
-
-#if 0
-status_t
-line_buffer_getc(struct line_buffer &buffer, char *_c)
-{
-}
-
-
-status_t
-line_buffer_ungetc(struct line_buffer &buffer, char *c)
-{
-}
-
-#endif
-
-
-bool
-line_buffer_tail_getc(struct line_buffer &buffer, char *c)
-{
-	if (buffer.in == 0)
-		return false;
-
-	*c = buffer.buffer[(buffer.first + --buffer.in) % buffer.size];
-	return true;	
-}

src/add-ons/kernel/drivers/tty/line_buffer.h

@@ -1,32 +0,0 @@
-/* 
-** Copyright 2004, Axel Dörfler, [email protected]. All rights reserved.
-** Distributed under the terms of the Haiku License.
-*/
-#ifndef LINE_BUFFER_H
-#define LINE_BUFFER_H
-
-
-#include <OS.h>
-
-
-struct line_buffer {
-	int32	first;
-	size_t	in;
-	size_t	size;
-	char	*buffer;
-};
-
-status_t init_line_buffer(struct line_buffer &buffer, size_t size);
-status_t uninit_line_buffer(struct line_buffer &buffer);
-status_t clear_line_buffer(struct line_buffer &buffer);
-int32 line_buffer_readable(struct line_buffer &buffer);
-int32 line_buffer_readable_line(struct line_buffer &buffer, char eol, char eof);
-int32 line_buffer_writable(struct line_buffer &buffer);
-ssize_t line_buffer_user_read(struct line_buffer &buffer, char *data,
-			size_t length, char eof = 0, bool* hitEOF = NULL);
-status_t line_buffer_getc(struct line_buffer &buffer, char *_c);
-status_t line_buffer_putc(struct line_buffer &buffer, char c);
-status_t line_buffer_ungetc(struct line_buffer &buffer, char *c);
-bool line_buffer_tail_getc(struct line_buffer &buffer, char *c);
-
-#endif	/* LINE_BUFFER_H */