1 files changed, 64 insertions, 0 deletions
diff --git a/src/pdclib/functions/stdlib/atexit.c b/src/pdclib/functions/stdlib/atexit.c
new file mode 100644
index 0000000..489c3df
--- /dev/null
+++ b/src/pdclib/functions/stdlib/atexit.c
@@ -0,0 +1,64 @@
+/* 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_exitstack[])( void );
+extern size_t _PDCLIB_exitptr;
+
+int atexit( void (*func)( void ) )
+{
+    if ( _PDCLIB_exitptr == 0 )
+    {
+        return -1;
+    }
+    else
+    {
+        _PDCLIB_exitstack[ --_PDCLIB_exitptr ] = 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 )
+{
+    int i;
+    for ( i = 0; i < 31; ++i )
+    {
+        assert( flags[ i ] == i );
+    }
+}
+
+int main( void )
+{
+    int i;
+    TESTCASE( atexit( &checkhandler ) == 0 );
+    for ( i = 0; i < 31; ++i )
+    {
+        TESTCASE( atexit( &counthandler ) == 0 );
+    }
+    return TEST_RESULTS;
+}
+
+#endif