Nut/OS  4.10.3
API Reference
fgetc.c
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00001 /*
00002  * Copyright (C) 2001-2003 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  *
00032  */
00033 
00034 /*
00035  * $Log$
00036  * Revision 1.5  2009/01/17 15:37:52  haraldkipp
00037  * Added some NUTASSERT macros to check function parameters.
00038  *
00039  * Revision 1.4  2008/09/18 09:45:25  haraldkipp
00040  * Reading 0xFF returned EOF. Fixed.
00041  *
00042  * Revision 1.3  2008/08/11 06:59:40  haraldkipp
00043  * BSD types replaced by stdint types (feature request #1282721).
00044  *
00045  * Revision 1.2  2007/04/12 09:09:57  haraldkipp
00046  * Support for feof() and ferror() was missing.
00047  *
00048  * Revision 1.1.1.1  2003/05/09 14:40:25  haraldkipp
00049  * Initial using 3.2.1
00050  *
00051  * Revision 1.2  2003/04/21 17:33:28  harald
00052  * Return correct result for character 0xFF
00053  *
00054  * Revision 1.1  2003/02/04 17:49:04  harald
00055  * *** empty log message ***
00056  *
00057  */
00058 
00059 #include "nut_io.h"
00060 
00061 #include <sys/nutdebug.h>
00062 #include <io.h>
00063 
00068 
00081 int fgetc(FILE * stream)
00082 {
00083     uint8_t ch;
00084     int rc;
00085 
00086     NUTASSERT(stream != NULL);
00087     if (stream->iob_flags & _IOUNG) {
00088         stream->iob_flags &= ~_IOUNG;
00089         return stream->iob_unget;
00090     }
00091     if ((rc = _read(stream->iob_fd, &ch, 1)) != 1) {
00092         if (rc) {
00093             /* Error. */
00094             stream->iob_flags |= _IOERR;
00095         }
00096         else {
00097             /* Time out or end of file. */
00098             stream->iob_flags |= _IOEOF;
00099         }
00100         return EOF;
00101     }
00102     return (int) ch;
00103 }
00104