diff packages/language/c/libc/stdio/current/include/streambuf.inl @ 115:6ed91473a1cd ecos-sw-2000-08-21

Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents
children 0ae0bc38e387
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+++ b/packages/language/c/libc/stdio/current/include/streambuf.inl
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+#ifndef CYGONCE_LIBC_STDIO_STREAMBUF_INL
+#define CYGONCE_LIBC_STDIO_STREAMBUF_INL
+//===========================================================================
+//
+//      streambuf.inl
+//
+//      Internal C library stdio stream buffer inline functions
+//
+//===========================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// -------------------------------------------                              
+// The contents of this file are subject to the Red Hat eCos Public License 
+// Version 1.1 (the "License"); you may not use this file except in         
+// compliance with the License.  You may obtain a copy of the License at    
+// http://www.redhat.com/                                                   
+//                                                                          
+// Software distributed under the License is distributed on an "AS IS"      
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
+// License for the specific language governing rights and limitations under 
+// the License.                                                             
+//                                                                          
+// The Original Code is eCos - Embedded Configurable Operating System,      
+// released September 30, 1998.                                             
+//                                                                          
+// The Initial Developer of the Original Code is Red Hat.                   
+// Portions created by Red Hat are                                          
+// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
+// All Rights Reserved.                                                     
+// -------------------------------------------                              
+//                                                                          
+//####COPYRIGHTEND####
+//===========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):    jlarmour
+// Contributors: 
+// Date:         2000-04-19
+// Purpose:     
+// Description: 
+// Usage:       Do not include this file directly, instead
+//              #include <cyg/libc/stdio/streambuf.hxx>
+//
+//####DESCRIPTIONEND####
+//
+//===========================================================================
+
+// CONFIGURATION
+
+#include <pkgconf/libc_stdio.h>   // Configuration header
+
+// Include buffered I/O?
+#if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
+
+
+// INCLUDES
+
+#include <cyg/infra/cyg_type.h>          // Common project-wide type definitions
+#include <cyg/infra/cyg_ass.h>           // Assertion support
+#include <errno.h>                       // Cyg_ErrNo
+#include <stdio.h>                       // fpos_t and iobuf defines
+#include <stdlib.h>                      // free()
+#include <cyg/libc/stdio/streambuf.hxx>  // header for this file, just in case
+
+// FUNCTIONS
+    
+inline
+Cyg_StdioStreamBuffer::Cyg_StdioStreamBuffer( cyg_ucount32 size=BUFSIZ,
+                                              cyg_uint8 *new_buffer=NULL ) :
+#if defined(CYGSEM_LIBC_STDIO_SETVBUF_MALLOC)
+    call_free(false),
+    buffer_bottom( NULL ),
+    buffer_size(0),
+#else
+    buffer_bottom( static_buffer ),
+    buffer_size(sizeof(static_buffer)),    
+#endif    
+    buffer_top(NULL),
+    current_buffer_position(NULL)
+{
+    // NB Many of the above members in the initialisation list may seem
+    // unnecessary, but it is to ensure a defined state if e.g. the malloc
+    // in set_buffer() should fail
+
+    (void)set_buffer(size, new_buffer);
+} // Cyg_StdioStreamBuffer constructor
+
+
+inline
+Cyg_StdioStreamBuffer::~Cyg_StdioStreamBuffer()
+{
+#ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
+    if ((buffer_bottom != NULL) && call_free)
+        free( buffer_bottom );
+#endif        
+} // Cyg_StdioStreamBuffer destructor
+
+
+inline cyg_ucount32
+Cyg_StdioStreamBuffer::get_buffer_space_used( void )
+{
+    return (buffer_top - current_buffer_position);
+} // get_buffer_space_used()
+
+
+inline cyg_count32
+Cyg_StdioStreamBuffer::get_buffer_size( void )
+{
+#ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
+    if (buffer_bottom==NULL)
+        return -1;
+#endif
+    return buffer_size;
+} // get_buffer_size()        
+
+
+inline cyg_ucount32
+Cyg_StdioStreamBuffer::get_buffer_addr_to_read( cyg_uint8 **buffer )
+{
+    *buffer = current_buffer_position;
+    
+    return (buffer_top - current_buffer_position);
+} // get_buffer_addr_to_read()
+
+inline void
+Cyg_StdioStreamBuffer::set_bytes_read( cyg_ucount32 bytes )
+{
+    cyg_uint8 *buffer_max = &buffer_bottom[ get_buffer_size() ];
+
+    current_buffer_position += bytes;
+
+    CYG_ASSERT( (current_buffer_position <= buffer_top),
+                "read too many bytes from buffer" );
+
+    if (current_buffer_position == buffer_max)
+        current_buffer_position = buffer_top = &buffer_bottom[0];
+    
+} // set_bytes_read()
+
+
+inline cyg_ucount32
+Cyg_StdioStreamBuffer::get_buffer_addr_to_write( cyg_uint8 **buffer )
+{
+    cyg_uint8 *buffer_max = &buffer_bottom[ get_buffer_size() ];
+    
+    *buffer = buffer_top;
+    
+    return (buffer_max - buffer_top);
+} // get_buffer_addr_to_write()
+
+
+inline void
+Cyg_StdioStreamBuffer::set_bytes_written( cyg_ucount32 bytes )
+{
+    buffer_top += bytes;
+
+    CYG_ASSERT( (buffer_top <= &buffer_bottom[ get_buffer_size() ]),
+                "wrote too many bytes into buffer" );
+} // set_bytes_written()
+
+
+inline void
+Cyg_StdioStreamBuffer::drain_buffer( void )
+{
+    buffer_top = current_buffer_position = &buffer_bottom[0];
+} // drain_buffer()
+
+#endif // if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
+
+#endif CYGONCE_LIBC_STDIO_STREAMBUF_INL multiple inclusion protection
+
+// EOF streambuf.inl