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//========================================================================
//
// fgets.cxx
//
// ISO C standard I/O fgets() function
//
//========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, 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.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jlarmour
// Contributors:
// Date: 2001-03-14
// Purpose: Implementation of ISO C standard I/O fgets() function
// Description:
// Usage:
//
//####DESCRIPTIONEND####
//
//=======================================================================
// CONFIGURATION
#include <pkgconf/libc_stdio.h> // Configuration header
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common 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
// FIXME: should be reworked to read buffer at a time, and scan that
// for newlines, rather than reading byte at a time.
externC char *
fgets( char *s, int n, FILE *stream ) __THROW
{
Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
Cyg_ErrNo err=ENOERR;
cyg_uint8 c;
cyg_uint8 *str=(cyg_uint8 *)s;
int nch;
CYG_CHECK_DATA_PTRC( s );
CYG_CHECK_DATA_PTRC( stream );
CYG_PRECONDITION( n > 0, "requested 0 or negative chars");
CYG_REPORT_FUNCTYPE( "returning string %08x");
CYG_REPORT_FUNCARG3( "s=%08x, n=%d, stream=%08x", s, n, stream );
for (nch=1; nch < n; nch++) {
err = real_stream->read_byte( &c );
// if nothing to read, try again ONCE after refilling buffer
if (EAGAIN == err) {
err = real_stream->refill_read_buffer();
if ( !err )
err = real_stream->read_byte( &c );
if (EAGAIN == err) {
if (1 == nch) { // indicates EOF at start
CYG_REPORT_RETVAL( NULL );
return NULL;
} else
break; // EOF
} // if
} // if
*str++ = c;
if ('\n' == c)
break;
} // while
*str = '\0'; // NULL terminate it
if (err && EAGAIN != err) {
real_stream->set_error( err );
errno = err;
CYG_REPORT_RETVAL( NULL );
return NULL;
} // if
CYG_REPORT_RETVAL( s );
return s;
} // fgets()
// EOF fgets.cxx
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