ffi: support intmax-t and uintmax-t types.

* configure: detect intmax_t and place HAVE_INTMAX_T into
config.h.

* ffi.c (ffi_init_extra_types): register intmax-t and
uintmax-t types. If HAVE_INTMAX_T is missing, then make them
aliases for longlong and ulonglong.

* txr.1: Documented.

* stdlib/doc-syms.tl: Updated.

1 files changed, 18 insertions, 0 deletions

diff --git a/ffi.c b/ffi.c
index 8be380b6..1ecd6678 100644
--- a/ffi.c
+++ b/ffi.c
@@ -38,6 +38,9 @@
 #include <wchar.h>
 #include <time.h>
 #include "config.h"
+#if HAVE_INTMAX_T
+#include <stdint.h>
+#endif
 #if HAVE_LIBFFI
 #include <ffi.h>
 #endif
@@ -4702,6 +4705,21 @@ static void ffi_init_extra_types(void)
   ffi_typedef(intern(lit("wint-t"), user_package),
               type_by_size[convert(wint_t, -1) > 0][sizeof (wint_t)]);
 
+  {
+#if HAVE_INTMAX_T
+    typedef intmax_t imax_t;
+#else
+    typedef long long imax_t;
+#endif
+
+    if (sizeof(imax_t) <= 8) {
+      ffi_typedef(intern(lit("intmax-t"), user_package),
+                  type_by_size[0][sizeof (imax_t)]);
+      ffi_typedef(intern(lit("uintmax-t"), user_package),
+                  type_by_size[1][sizeof (imax_t)]);
+    }
+  }
+
 #if HAVE_SYS_TYPES_H
   ffi_typedef(intern(lit("blkcnt-t"), user_package),
               type_by_size[convert(blkcnt_t, -1) > 0][sizeof (blkcnt_t)]);