Added qsort.

[pdclib] / internals / _PDCLIB_config.h

diff --git a/internals/_PDCLIB_config.h b/internals/_PDCLIB_config.h
index 753080ba25cee8780f50c90f8d59f0cd9c0ac56d..d2188ff112f8657124884bf3b54dd700138fa2ca 100644 (file)
--- a/internals/_PDCLIB_config.h
+++ b/internals/_PDCLIB_config.h
@@ -23,6 +23,11 @@
 #define _PDCLIB_SUCCESS 0
 #define _PDCLIB_FAILURE -1
 
+/* qsort() in <stdlib.h> requires a function that swaps two memory areas.     */
+/* Below is a naive implementation that can be improved significantly for     */
+/* specific platforms, e.g. by swapping int instead of char.                  */
+#define _PDCLIB_memswp( i, j, size ) char tmp; do { tmp = *i; *i++ = *j; *j++ = tmp; } while ( --size );
+
 /* -------------------------------------------------------------------------- */
 /* Integers                                                                   */
 /* -------------------------------------------------------------------------- */