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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [language/] [c/] [libc/] [stdio/] [v2_0/] [src/] [input/] [fread.cxx] - Rev 27
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//======================================================================== // // fread.cxx // // ANSI Stdio fread() function // //======================================================================== //####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: // 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> // Assertion support #include <cyg/infra/cyg_trac.h> // 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 size_t fread( void *ptr, size_t object_size, size_t num_objects, FILE *stream ) { Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream; cyg_ucount32 bytes_read; cyg_ucount32 bytes_to_read; cyg_ucount32 total_read; Cyg_ErrNo err; cyg_uint8 *ptrc = (cyg_uint8 *)ptr; CYG_REPORT_FUNCNAMETYPE( "fread", "read %d objects" ); CYG_REPORT_FUNCARG4( "ptr=%08x, object_size=%d, num_objects=%d, " "stream=%08x", ptr, object_size, num_objects, stream ); bytes_to_read = object_size*num_objects; total_read = 0; if ( !bytes_to_read ) { CYG_REPORT_RETVAL(0); return 0; } // if err = real_stream->read( (cyg_uint8 *)ptr, bytes_to_read, &bytes_read ); bytes_to_read -= bytes_read; total_read += bytes_read; ptrc += bytes_read; while (!err && bytes_to_read) { // if no err, but not finished - get next err = real_stream->refill_read_buffer(); if ( !err ) { err = real_stream->read( (cyg_uint8 *)ptrc, bytes_to_read, &bytes_read ); bytes_to_read -= bytes_read; total_read += bytes_read; ptrc += bytes_read; } // if } // while if (err) { real_stream->set_error( err ); errno = err; } // if // we return the number of _objects_ read. Simple division is // sufficient as this returns the quotient rather than rounding CYG_REPORT_RETVAL( bytes_read/object_size ); return total_read/object_size; } // fread() // EOF fread.cxx
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