1 //===========================================================================
5 // ISO C standard I/O get character functions
7 //===========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
10 // This file is part of eCos, the Embedded Configurable Operating System.
11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
13 // eCos is free software; you can redistribute it and/or modify it under
14 // the terms of the GNU General Public License as published by the Free
15 // Software Foundation; either version 2 or (at your option) any later version.
17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 // You should have received a copy of the GNU General Public License along
23 // with eCos; if not, write to the Free Software Foundation, Inc.,
24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 // As a special exception, if other files instantiate templates or use macros
27 // or inline functions from this file, or you compile this file and link it
28 // with other works to produce a work based on this file, this file does not
29 // by itself cause the resulting work to be covered by the GNU General Public
30 // License. However the source code for this file must still be made available
31 // in accordance with section (3) of the GNU General Public License.
33 // This exception does not invalidate any other reasons why a work based on
34 // this file might be covered by the GNU General Public License.
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37 // at http://sources.redhat.com/ecos/ecos-license/
38 // -------------------------------------------
39 //####ECOSGPLCOPYRIGHTEND####
40 //===========================================================================
41 //#####DESCRIPTIONBEGIN####
43 // Author(s): jlarmour
46 // Purpose: Provide the fgetc() function. Also provides the function
47 // version of getc() and getchar()
51 //####DESCRIPTIONEND####
53 //===========================================================================
57 #include <pkgconf/libc_stdio.h> // Configuration header
61 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
62 #include <cyg/infra/cyg_ass.h> // Standard eCos assertion support
63 #include <cyg/infra/cyg_trac.h> // Standard eCos tracing support
64 #include <stddef.h> // NULL and size_t from compiler
65 #include <stdio.h> // header for this file
66 #include <errno.h> // error codes
67 #include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream
72 fgetc( FILE *stream ) __THROW
74 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
75 cyg_ucount32 bytes_read;
79 CYG_REPORT_FUNCNAMETYPE("fgetc", "returning char %d");
80 CYG_REPORT_FUNCARG1XV( stream );
82 CYG_CHECK_DATA_PTR( stream, "stream is not a valid pointer" );
84 err = real_stream->read( &c, 1, &bytes_read );
86 // Why do we need this? Because the buffer might be empty.
87 if (!err && !bytes_read) { // if no err, but nothing to read, try again
88 err = real_stream->refill_read_buffer();
90 err = real_stream->read( &c, 1, &bytes_read );
93 CYG_ASSERT( (ENOERR != err) || (1 == bytes_read), "Didn't read 1 byte!" );
97 if ( EAGAIN != err ) {
98 real_stream->set_error( err );
101 CYG_REPORT_RETVAL(EOF);
105 CYG_REPORT_RETVAL((int)c);
111 // Also define getc() even though it can be a macro.
112 // Undefine it first though
116 getchar( void ) __THROW
118 return fgetc( stdin );
124 // Also define getc() even though it can be a macro.
125 // Undefine it first though
129 getc( FILE * ) __THROW CYGBLD_ATTRIB_WEAK_ALIAS(fgetc);