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//=========================================================================== // // fgetc.cxx // // ISO C standard I/O get character functions // //=========================================================================== //####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. // // eCos 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 2 or (at your option) any later version. // // eCos 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 eCos; if not, write to the Free Software Foundation, Inc., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. // // As a special exception, if other files instantiate templates or use macros // or inline functions from this file, or you compile this file and link it // with other works to produce a work based on this file, this file does not // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####ECOSGPLCOPYRIGHTEND#### //=========================================================================== //#####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) { if ( EAGAIN != 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