Rename AC_ prefixes to AX_ (only in names of aa macros!).

1 files changed, 47 insertions, 0 deletions

diff --git a/m4/ax_func_memmove.m4 b/m4/ax_func_memmove.m4
new file mode 100644
index 0000000..9334c6c
--- /dev/null
+++ b/m4/ax_func_memmove.m4
@@ -0,0 +1,47 @@
+# ===========================================================================
+#         http://www.nongnu.org/autoconf-archive/ax_func_memmove.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_FUNC_MEMMOVE
+#
+# DESCRIPTION
+#
+#   Checks for a memmove that can handle overlaps correctly. If no working
+#   memmove is found, request a replacement and warn the user about it.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Ruediger Kuhlmann <info@ruediger-kuhlmann.de>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved.
+
+AC_DEFUN([AX_FUNC_MEMMOVE],
+[AC_CHECK_FUNCS(memmove)
+AC_MSG_CHECKING(for working memmove)
+AC_CACHE_VAL(ac_cv_have_working_memmove,
+[AC_TRY_RUN(
+[#include <stdio.h>
+
+int main(void)
+{
+    char buf[10];
+    strcpy (buf, "01234567");
+    memmove (buf, buf + 2, 3);
+    if (strcmp (buf, "23434567"))
+        exit (1);
+    strcpy (buf, "01234567");
+    memmove (buf + 2, buf, 3);
+    if (strcmp (buf, "01012567"))
+        exit (1);
+    exit (0);
+}], ac_cv_have_working_memmove=yes, ac_cv_have_working_memmove=no, ac_cv_have_working_memmove=cross)])
+AC_MSG_RESULT([$ac_cv_have_working_memmove])
+if test x$ac_cv_have_working_memmove != "xyes"; then
+  AC_LIBOBJ(memmove)
+  AC_MSG_WARN([Replacing missing/broken memmove.])
+  AC_DEFINE(PREFER_PORTABLE_MEMMOVE, 1, "enable replacement memmove if system memmove is broken or missing")
+fi])