Mercurial > ecos
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 --- /dev/null +++ b/packages/language/c/libc/stdio/current/src/input/fgetc.cxx @@ -0,0 +1,120 @@ +//=========================================================================== +// +// 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
