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