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/* fseek( FILE *, long, int )
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>
#ifndef REGTEST
#include "pdclib/_PDCLIB_glue.h"
int fseek( struct _PDCLIB_file_t * stream, long offset, int whence )
{
if ( stream->status & _PDCLIB_FWRITE )
{
if ( _PDCLIB_flushbuffer( stream ) == EOF )
{
return EOF;
}
}
stream->status &= ~ _PDCLIB_EOFFLAG;
if ( stream->status & _PDCLIB_FRW )
{
stream->status &= ~ ( _PDCLIB_FREAD | _PDCLIB_FWRITE );
}
return ( _PDCLIB_seek( stream, offset, whence ) != EOF ) ? 0 : EOF;
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
#include <string.h>
int main( void )
{
FILE * fh;
TESTCASE( ( fh = tmpfile() ) != NULL );
TESTCASE( fwrite( teststring, 1, strlen( teststring ), fh ) == strlen( teststring ) );
/* General functionality */
TESTCASE( fseek( fh, -1, SEEK_END ) == 0 );
TESTCASE( (size_t)ftell( fh ) == strlen( teststring ) - 1 );
TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
TESTCASE( (size_t)ftell( fh ) == strlen( teststring ) );
TESTCASE( fseek( fh, 0, SEEK_SET ) == 0 );
TESTCASE( ftell( fh ) == 0 );
TESTCASE( fseek( fh, 5, SEEK_CUR ) == 0 );
TESTCASE( ftell( fh ) == 5 );
TESTCASE( fseek( fh, -3, SEEK_CUR ) == 0 );
TESTCASE( ftell( fh ) == 2 );
/* Checking behaviour around EOF */
TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
TESTCASE( ! feof( fh ) );
TESTCASE( fgetc( fh ) == EOF );
TESTCASE( feof( fh ) );
TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
TESTCASE( ! feof( fh ) );
/* Checking undo of ungetc() */
TESTCASE( fseek( fh, 0, SEEK_SET ) == 0 );
TESTCASE( fgetc( fh ) == teststring[0] );
TESTCASE( fgetc( fh ) == teststring[1] );
TESTCASE( fgetc( fh ) == teststring[2] );
TESTCASE( ftell( fh ) == 3 );
TESTCASE( ungetc( teststring[2], fh ) == teststring[2] );
TESTCASE( ftell( fh ) == 2 );
TESTCASE( fgetc( fh ) == teststring[2] );
TESTCASE( ftell( fh ) == 3 );
TESTCASE( ungetc( 'x', fh ) == 'x' );
TESTCASE( ftell( fh ) == 2 );
TESTCASE( fgetc( fh ) == 'x' );
TESTCASE( ungetc( 'x', fh ) == 'x' );
TESTCASE( ftell( fh ) == 2 );
TESTCASE( fseek( fh, 2, SEEK_SET ) == 0 );
TESTCASE( fgetc( fh ) == teststring[2] );
/* Checking error handling */
TESTCASE( fseek( fh, -5, SEEK_SET ) == -1 );
TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
TESTCASE( fclose( fh ) == 0 );
return TEST_RESULTS;
}
#endif
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