Convert C (un)signed long long values to bignums properly. This patch also does the following: - Uses make_fixnum instead of make_integer when the argument is guaranteed to be in the fixnum range. - Introduces make_unsigned_integer so that we handle unsigned values with the high bit set correctly. - Introduces conversions between bignums and (un)signed long long values. - Uses mp_set_memory_functions with the BSD MP code, if it exists. - Eliminates some unnecessary consing in the Lisp + and * implementations. - Fixes a problem with check_valid_xbm_inline(). This function is called during intialization. It calls Ftimes. When using pdump, this is a problem, because (a) the bignum code is not initialized until *after* dumping, so we don't try to dump any bignums, and (b) multiplication of integers is done inside bignums so we handle fixnum overflow correctly. I decided that an XBM file with dimensions that don't fit into fixnums is probably not something we want to try to handle anyway, and did the arithmetic with C values instead of Lisp values. Doing that broke one test, which started getting a different error message from the one it expected, so I adjusted the test to match the new reality. - Fixes a few miscellaneous bugs in the BSD MP code. See <CAHCOHQk0u0=eD1fUMHTNWi2Yh=1WgiYyCXdMbsGzHBNhdqYz4w@mail.gmail.com> in xemacs-patches, as well as followup messages.

--- a/src/glyphs.c	Wed Apr 24 20:16:14 2013 -0400
+++ b/src/glyphs.c	Mon Jun 17 10:23:00 2013 -0600
@@ -2638,6 +2638,7 @@
 check_valid_xbm_inline (Lisp_Object data)
 {
   Lisp_Object width, height, bits, args[2];
+  unsigned long i_width, i_height;
 
   if (!CONSP (data) ||
       !CONSP (XCDR (data)) ||
@@ -2651,22 +2652,15 @@
 
   CHECK_STRING (bits);
 
-  if (!NATNUMP (width))
+  if (!FIXNUMP (width) || XREALFIXNUM (width) < 0)
     invalid_argument ("Width must be a natural number", width);
 
-  if (!NATNUMP (height))
+  if (!FIXNUMP (height) || XREALFIXNUM (height) < 0)
     invalid_argument ("Height must be a natural number", height);
 
-  args[0] = width;
-  args[1] = height;
-
-  args[0] = Ftimes (countof (args), args);
-  args[1] = make_integer (8);
-
-  args[0] = Fquo (countof (args), args);
-  args[1] = make_integer (string_char_length (bits));
-
-  if (!NILP (Fgtr (countof (args), args)))
+  i_width = (unsigned long) XREALFIXNUM (width);
+  i_height = (unsigned long) XREALFIXNUM (height);
+  if (i_width * i_height / 8UL > string_char_length (bits))
     invalid_argument ("data is too short for width and height",
 			 vector3 (width, height, bits));
 }