X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdlib%2Fatexit.c;h=89832f1ea25dd4f691cd198c3acb286b612904de;hb=d6f1494a4f38a212b29a13ee713885058dcf0fe7;hp=ac478c94cabff262e50606b8632018b16dec2896;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/stdlib/atexit.c b/functions/stdlib/atexit.c
index ac478c9..89832f1 100644
--- a/functions/stdlib/atexit.c
+++ b/functions/stdlib/atexit.c
@@ -1,9 +1,60 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-// TODO: C/C++ linkages
-int atexit( void (*func) ( void ) ) { /* TODO */ };
+/* atexit( void (*)( void ) )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdlib.h>
+
+#ifndef REGTEST
+
+extern void (*_PDCLIB_regstack[])( void );
+extern size_t _PDCLIB_regptr;
+
+int atexit( void (*func)( void ) )
+{
+    if ( _PDCLIB_regptr == 0 )
+    {
+        return -1;
+    }
+    else
+    {
+        _PDCLIB_regstack[ --_PDCLIB_regptr ] = func;
+        return 0;
+    }
+}
+
+#endif
+
+#ifdef TEST
+#include "_PDCLIB_test.h"
+#include <assert.h>
+
+static int flags[ 32 ];
+
+static void counthandler( void )
+{
+    static int count = 0;
+    flags[ count ] = count;
+    ++count;
+}
+
+static void checkhandler( void )
+{
+    for ( int i = 0; i < 31; ++i )
+    {
+        assert( flags[ i ] == i );
+    }
+}
+
+int main( void )
+{
+    TESTCASE( atexit( &checkhandler ) == 0 );
+    for ( int i = 0; i < 31; ++i )
+    {
+        TESTCASE( atexit( &counthandler ) == 0 );
+    }
+    return TEST_RESULTS;
+}
+
+#endif