-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* $Id$ */
-int fseek( FILE * stream, long offset, int mode ) { /* TODO */ };
+/* fseek( FILE *, long offset, int )
-/* PDPC code - unreviewed
-Read the note in fopen.c.
-{
- long newpos;
-#ifdef __OS2__
- ULONG retpos;
- APIRET rc;
-#endif
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
+*/
- if (stream->mode == __WRITE_MODE)
- {
- fflush(stream);
- }
- if (whence == SEEK_SET)
+#include <stdio.h>
+
+#ifndef REGTEST
+
+#include <_PDCLIB_glue.h>
+
+int fseek_unlocked( struct _PDCLIB_file_t * stream, long loffset, int whence )
+{
+ _PDCLIB_int64_t offset = loffset;
+ if ( stream->status & _PDCLIB_FWRITE )
{
- newpos = offset;
+ if ( _PDCLIB_flushbuffer( stream ) == EOF )
+ {
+ return EOF;
+ }
}
- else if (whence == SEEK_CUR)
+ stream->status &= ~ _PDCLIB_EOFFLAG;
+ if ( stream->status & _PDCLIB_FRW )
{
- newpos = offset + stream->bufStartR + (stream->upto - stream->fbuf);
+ stream->status &= ~ ( _PDCLIB_FREAD | _PDCLIB_FWRITE );
}
- if ((newpos > stream->bufStartR)
- && (newpos < (stream->bufStartR + (stream->endbuf - stream->fbuf)))
- && stream->update)
+
+ if ( whence == SEEK_CUR )
{
- stream->upto = stream->fbuf + (size_t)(newpos - stream->bufStartR);
+ whence = SEEK_SET;
+ offset += _PDCLIB_ftell64( stream );
}
- else
- {
-#ifdef __OS2__
- rc = DosSetFilePtr(stream->hfile, newpos, FILE_BEGIN, &retpos);
- if ((rc != 0) || (retpos != newpos))
- {
- errno = rc;
- return (-1);
- }
- else
- {
- stream->endbuf = stream->fbuf + stream->szfbuf;
- stream->upto = stream->endbuf;
- stream->bufStartR = newpos - stream->szfbuf;
- }
-#endif
-#ifdef __MSDOS
- __seek(stream->hfile, newpos, whence);
- stream->endbuf = stream->fbuf + stream->szfbuf;
- stream->upto = stream->endbuf;
- stream->bufStartR = newpos - stream->szfbuf;
+
+ 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
- }
- stream->quickBin = 0;
- stream->quickText = 0;
- stream->ungetCh = -1;
- return (0);
+
+#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] );
+ /* 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;
}
-*/
+
+#endif
+