-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-size_t fread( void * restrict ptr, size_t size, size_t nelem, FILE * restrict stream ) { /* TODO */ };
+/* $Id$ */
+
+/* fwrite( void *, size_t, size_t, 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>
+
+#ifndef REGTEST
+
+#include <_PDCLIB_glue.h>
+
+#include <stdbool.h>
+#include <string.h>
+
+size_t fread( void * _PDCLIB_restrict ptr, size_t size, size_t nmemb, struct _PDCLIB_file_t * _PDCLIB_restrict stream )
+{
+ if ( _PDCLIB_prepread( stream ) == EOF )
+ {
+ return 0;
+ }
+ char * dest = (char *)ptr;
+ size_t nmemb_i;
+ for ( nmemb_i = 0; nmemb_i < nmemb; ++nmemb_i )
+ {
+ for ( size_t size_i = 0; size_i < size; ++size_i )
+ {
+ if ( stream->bufidx == stream->bufend )
+ {
+ if ( _PDCLIB_fillbuffer( stream ) == EOF )
+ {
+ /* Could not read requested data */
+ return nmemb_i;
+ }
+ }
+ dest[ nmemb_i * size + size_i ] = stream->buffer[ stream->bufidx++ ];
+ }
+ }
+ return nmemb_i;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+ FILE * fh;
+ char const * message = "Testing fwrite()...\n";
+ char buffer[21];
+ buffer[20] = 'x';
+ TESTCASE( ( fh = tmpfile() ) != NULL );
+ /* fwrite() / readback */
+ TESTCASE( fwrite( message, 1, 20, fh ) == 20 );
+ rewind( fh );
+ TESTCASE( fread( buffer, 1, 20, fh ) == 20 );
+ TESTCASE( memcmp( buffer, message, 20 ) == 0 );
+ TESTCASE( buffer[20] == 'x' );
+ /* same, different nmemb / size settings */
+ rewind( fh );
+ TESTCASE( memset( buffer, '\0', 20 ) == buffer );
+ TESTCASE( fwrite( message, 5, 4, fh ) == 4 );
+ rewind( fh );
+ TESTCASE( fread( buffer, 5, 4, fh ) == 4 );
+ TESTCASE( memcmp( buffer, message, 20 ) == 0 );
+ TESTCASE( buffer[20] == 'x' );
+ /* same... */
+ rewind( fh );
+ TESTCASE( memset( buffer, '\0', 20 ) == buffer );
+ TESTCASE( fwrite( message, 20, 1, fh ) == 1 );
+ rewind( fh );
+ TESTCASE( fread( buffer, 20, 1, fh ) == 1 );
+ TESTCASE( memcmp( buffer, message, 20 ) == 0 );
+ TESTCASE( buffer[20] == 'x' );
+ /* Done. */
+ TESTCASE( fclose( fh ) == 0 );
+ return TEST_RESULTS;
+}
+
+#endif
+