Add --enable-dmalloc to link against the dmalloc malloc debugger.

It's not as strong as Insure, but it's free, reasonably efficient and
works on every platform.

source/configure.in

@@ -33,6 +33,14 @@ AC_ARG_ENABLE(developer, [  --enable-developer      turn on developer warnings a
 	CFLAGS="${CFLAGS} -g -Wall -Wshadow -Wstrict-prototypes -Wpointer-arith -Wcast-qual -Wcast-align -DDEBUG_PASSWORD -DDEVELOPER"
     fi])
 
+AC_ARG_ENABLE(dmalloc, [  --enable-dmalloc          enable heap debugging [default=no]])
+
+if test "x$enable_dmalloc" = xyes
+then
+	AC_DEFINE(ENABLE_DMALLOC, 1, [Define to turn on dmalloc debugging])
+	LIBS="$LIBS -ldmalloc"	
+fi
+
 dnl Checks for programs.
 AC_PROG_CC
 AC_PROG_INSTALL

source/include/config.h.in

@@ -1,4 +1,4 @@
-/* include/config.h.in.  Generated automatically from configure.in by autoheader.  */
+/* include/config.h.in.  Generated automatically from configure.in by autoheader 2.13.  */
 
 /* Define if on AIX 3.
    System headers sometimes define this.
@@ -1082,6 +1082,9 @@
 /* Define if you have the socket library (-lsocket).  */
 #undef HAVE_LIBSOCKET
 
+/* Define to turn on dmalloc debugging */
+#undef ENABLE_DMALLOC
+
 /* Do we have rl_completion_matches? */
 #undef HAVE_NEW_LIBREADLINE
 

source/include/includes.h

@@ -975,6 +975,13 @@ int vasprintf(char **ptr, const char *format, va_list ap);
 #include <dlfcn.h>
 #endif
 
+/* dmalloc -- free heap debugger (dmalloc.org).  This should be near
+ * the *bottom* of include files so as not to conflict. */
+#ifdef DMALLOC
+#  include <dmalloc.h>
+#endif
+
+
 /* Some POSIX definitions for those without */
  
 #ifndef S_IFDIR

source/lib/talloc.c

@@ -45,7 +45,13 @@
  * memory it contains all in one allocation, which might be a bit
  * faster and perhaps use less memory overhead.
  *
- * That smells like a premature optimization, though.  -- mbp */
+ * That smells like a premature optimization, though.  -- mbp
+ **/
+
+/**
+ * If you want testing for memory corruption, link with dmalloc or use
+ * Insure++.  It doesn't seem useful to duplicate them here.
+ **/
 
 #include "includes.h"