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/* freopen( const char *, const char *, FILE * )
This file is part of the Public Domain C Library (PDCLib).
Permission is granted to use, modify, and / or redistribute at will.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef REGTEST
#include "pdclib/_PDCLIB_glue.h"
struct _PDCLIB_file_t * freopen( const char * _PDCLIB_restrict filename, const char * _PDCLIB_restrict mode, struct _PDCLIB_file_t * _PDCLIB_restrict stream )
{
unsigned int status = stream->status & ( _IONBF | _IOLBF | _IOFBF | _PDCLIB_FREEBUFFER | _PDCLIB_DELONCLOSE );
/* TODO: This function can change wide orientation of a stream */
if ( stream->status & _PDCLIB_FWRITE )
{
_PDCLIB_flushbuffer( stream );
}
if ( ( filename == NULL ) && ( stream->filename == NULL ) )
{
/* TODO: Special handling for mode changes on std-streams */
return NULL;
}
_PDCLIB_close( stream->handle );
/* TODO: It is not nice to do this on a stream we just closed.
It does not matter with the current implementation of clearerr(),
but it might start to matter if someone replaced that implementation.
*/
clearerr( stream );
/* The new filename might not fit the old buffer */
if ( filename == NULL )
{
/* Use previous filename */
filename = stream->filename;
}
else if ( ( stream->filename != NULL ) && ( strlen( stream->filename ) >= strlen( filename ) ) )
{
/* Copy new filename into existing buffer */
strcpy( stream->filename, filename );
}
else
{
/* Allocate new buffer */
if ( ( stream->filename = (char *)malloc( strlen( filename ) ) ) == NULL )
{
return NULL;
}
strcpy( stream->filename, filename );
}
if ( ( mode == NULL ) || ( filename[0] == '\0' ) )
{
return NULL;
}
if ( ( stream->status = _PDCLIB_filemode( mode ) ) == 0 )
{
return NULL;
}
/* Re-add the flags we saved above */
stream->status |= status;
stream->bufidx = 0;
stream->bufend = 0;
stream->ungetidx = 0;
/* TODO: Setting mbstate */
if ( ( stream->handle = _PDCLIB_open( filename, stream->status ) ) == _PDCLIB_NOHANDLE )
{
return NULL;
}
return stream;
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
int main( void )
{
FILE * fin;
FILE * fout;
TESTCASE( ( fin = fopen( testfile1, "wb+" ) ) != NULL );
TESTCASE( fputc( 'x', fin ) == 'x' );
TESTCASE( fclose( fin ) == 0 );
TESTCASE( ( fin = freopen( testfile1, "rb", stdin ) ) != NULL );
TESTCASE( getchar() == 'x' );
TESTCASE( ( fout = freopen( testfile2, "wb+", stdout ) ) != NULL );
TESTCASE( putchar( 'x' ) == 'x' );
rewind( fout );
TESTCASE( fgetc( fout ) == 'x' );
TESTCASE( fclose( fin ) == 0 );
TESTCASE( fclose( fout ) == 0 );
TESTCASE( remove( testfile1 ) == 0 );
TESTCASE( remove( testfile2 ) == 0 );
return TEST_RESULTS;
}
#endif
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