#include <_PDCLIB_glue.h>
-int fseek( struct _PDCLIB_file_t * stream, long offset, int whence )
+int fseek_unlocked( struct _PDCLIB_file_t * stream, long loffset, int whence )
{
+ _PDCLIB_int64_t offset = loffset;
if ( stream->status & _PDCLIB_FWRITE )
{
if ( _PDCLIB_flushbuffer( stream ) == EOF )
{
stream->status &= ~ ( _PDCLIB_FREAD | _PDCLIB_FWRITE );
}
+
+ if ( whence == SEEK_CUR )
+ {
+ whence = SEEK_SET;
+ offset += _PDCLIB_ftell64( stream );
+ }
+
return ( _PDCLIB_seek( stream, offset, whence ) != EOF ) ? 0 : EOF;
}
+int fseek( struct _PDCLIB_file_t * stream, long loffset, int whence )
+{
+ flockfile( stream );
+ int r = fseek_unlocked( stream, loffset, whence );
+ funlockfile( stream );
+ return r;
+}
+
#endif
#ifdef TEST
#include <_PDCLIB_test.h>
+#include <string.h>
int main( void )
{
- TESTCASE( NO_TESTDRIVER );
+ 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] );
+ /* PDCLIB-7: Check that we handle the underlying file descriptor correctly
+ * in the SEEK_CUR case */
+ TESTCASE( fseek( fh, 10, SEEK_SET ) == 0 );
+ TESTCASE( ftell( fh ) == 10l );
+ TESTCASE( fseek( fh, 0, SEEK_CUR ) == 0 );
+ TESTCASE( ftell( fh ) == 10l );
+ TESTCASE( fseek( fh, 2, SEEK_CUR ) == 0 );
+ TESTCASE( ftell( fh ) == 12l );
+ TESTCASE( fseek( fh, -1, SEEK_CUR ) == 0 );
+ TESTCASE( ftell( fh ) == 11l );
+ /* Checking error handling */
+ TESTCASE( fseek( fh, -5, SEEK_SET ) == -1 );
+ TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
+ TESTCASE( fclose( fh ) == 0 );
return TEST_RESULTS;
}