X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2Fstdlib%2Fatexit.c;h=808bcb1176406ff4c855d38e0097dbc32793f012;hp=9792cad1846968addb78e2100d0909aebd3ae916;hb=da0f3f353d417fed71f358a48d5d5394145e460d;hpb=0a5395faab237ba9008352b0f4bee9659bbd3d5f

diff --git a/functions/stdlib/atexit.c b/functions/stdlib/atexit.c
index 9792cad..808bcb1 100644
--- a/functions/stdlib/atexit.c
+++ b/functions/stdlib/atexit.c
@@ -1,25 +1,60 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* atexit( void (*)( void ) )
 
-// TODO: C/C++ linkages
-int atexit( void (*func) ( void ) ) { /* TODO */ };
+   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
 
-/* PDPC code - unreviewed
+extern void (*_PDCLIB_exitstack[])( void );
+extern size_t _PDCLIB_exitptr;
+
+int atexit( void (*func)( void ) )
 {
-    int x;
-    
-    for (x = 0; x < __NATEXIT; x++)
+    if ( _PDCLIB_exitptr == 0 )
+    {
+        return -1;
+    }
+    else
     {
-        if (__userExit[x] == 0)
-        {
-            __userExit[x] = func;
-            return (0);
-        }
+        _PDCLIB_exitstack[ --_PDCLIB_exitptr ] = func;
+        return 0;
     }
-    return (-1);
 }
-*/
+
+#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