diff packages/language/c/libc/stdio/current/src/input/fgetc.cxx @ 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 e0c0827131d1
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new file mode 100644
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+++ b/packages/language/c/libc/stdio/current/src/input/fgetc.cxx
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+//===========================================================================
+//
+//      fgetc.cxx
+//
+//      ISO C standard I/O get character 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:         2000-04-20
+// Purpose:      Provide the fgetc() function. Also provides the function
+//               version of getc() and getchar()
+// Description: 
+// Usage:       
+//
+//####DESCRIPTIONEND####
+//
+//===========================================================================
+
+// CONFIGURATION
+
+#include <pkgconf/libc_stdio.h>   // Configuration header
+
+// INCLUDES
+
+#include <cyg/infra/cyg_type.h>     // Common project-wide type definitions
+#include <cyg/infra/cyg_ass.h>      // Standard eCos assertion support
+#include <cyg/infra/cyg_trac.h>     // Standard eCos tracing support
+#include <stddef.h>                 // NULL and size_t from compiler
+#include <stdio.h>                  // header for this file
+#include <errno.h>                  // error codes
+#include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream
+
+// FUNCTIONS
+
+externC int
+fgetc( FILE *stream )
+{
+    Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
+    cyg_ucount32 bytes_read;
+    Cyg_ErrNo err;
+    cyg_uint8 c;
+
+    CYG_REPORT_FUNCNAMETYPE("fgetc", "returning char %d");
+    CYG_REPORT_FUNCARG1XV( stream );
+    
+    CYG_CHECK_DATA_PTR( stream, "stream is not a valid pointer" );
+
+    err = real_stream->read( &c, 1, &bytes_read );
+
+    // Why do we need this?  Because the buffer might be empty.
+    if (!err && !bytes_read) { // if no err, but nothing to read, try again
+        err = real_stream->refill_read_buffer();
+        if ( !err )
+            err = real_stream->read( &c, 1, &bytes_read );
+    } // if
+
+    CYG_ASSERT( (ENOERR != err) || (1 == bytes_read), "Didn't read 1 byte!" );
+
+    if (err)
+    {
+        real_stream->set_error( err );
+        errno = err;
+        CYG_REPORT_RETVAL(EOF);
+        return EOF;
+    } // if
+    
+    CYG_REPORT_RETVAL((int)c);
+    return (int)c;
+
+} // fgetc()
+
+
+// Also define getc() even though it can be a macro.
+// Undefine it first though
+#undef getchar
+
+externC int
+getchar( void )
+{
+    return fgetc( stdin );
+} // getchar()
+
+
+// EXPORTED SYMBOLS
+
+// Also define getc() even though it can be a macro.
+// Undefine it first though
+#undef getc
+
+externC int
+getc( FILE * ) CYGBLD_ATTRIB_WEAK_ALIAS(fgetc);
+
+// EOF fgetc.cxx