Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / libguile / conv-uinteger.i.c

diff --git a/guile18/libguile/conv-uinteger.i.c b/guile18/libguile/conv-uinteger.i.c
new file mode 100644 (file)
index 0000000..ff0d280
--- /dev/null
+++ b/guile18/libguile/conv-uinteger.i.c
@@ -0,0 +1,118 @@
+/* This code in included by number.s.c to generate integer conversion
+   functions like scm_to_int and scm_from_int.  It is only for
+   unsigned types, see conv-integer.i.c for the signed variant.
+*/
+
+/* You need to define the following macros before including this
+   template.  They are undefined at the end of this file to giove a
+   clean slate for the next inclusion.
+
+   TYPE         - the integral type to be converted
+   TYPE_MIN     - the smallest representable number of TYPE, typically 0.
+   TYPE_MAX     - the largest representable number of TYPE
+   SIZEOF_TYPE  - the size of TYPE, equal to "sizeof (TYPE)" but
+                  in a form that can be computed by the preprocessor.
+                 When this number is 0, the preprocessor is not used
+                 to select which code to compile; the most general
+                 code is always used.
+
+   SCM_TO_TYPE_PROTO(arg), SCM_FROM_TYPE_PROTO(arg) 
+                - These two macros should expand into the prototype
+                  for the two defined functions, without the return
+                  type.
+
+*/
+
+TYPE
+SCM_TO_TYPE_PROTO (SCM val)
+{
+  if (SCM_I_INUMP (val))
+    {
+      scm_t_signed_bits n = SCM_I_INUM (val);
+      if (n >= 0
+         && ((scm_t_uintmax)n) >= TYPE_MIN && ((scm_t_uintmax)n) <= TYPE_MAX)
+       return n;
+      else
+       {
+       out_of_range:
+         scm_i_range_error (val,
+                            scm_from_unsigned_integer (TYPE_MIN),
+                            scm_from_unsigned_integer (TYPE_MAX));
+         return 0;
+       }
+    }
+  else if (SCM_BIGP (val))
+    {
+      if (TYPE_MAX <= SCM_MOST_POSITIVE_FIXNUM)
+       goto out_of_range;
+      else if (TYPE_MAX <= ULONG_MAX)
+       {
+         if (mpz_fits_ulong_p (SCM_I_BIG_MPZ (val)))
+           {
+             unsigned long n = mpz_get_ui (SCM_I_BIG_MPZ (val));
+#if SIZEOF_TYPE != 0 && SIZEOF_TYPE > SCM_SIZEOF_LONG
+             return n;
+#else
+             if (n >= TYPE_MIN && n <= TYPE_MAX)
+               return n;
+             else
+               goto out_of_range;
+#endif
+           }
+         else
+           goto out_of_range;
+       }
+      else
+       {
+         scm_t_uintmax n;
+         size_t count;
+
+         if (mpz_sgn (SCM_I_BIG_MPZ (val)) < 0)
+           goto out_of_range;
+
+         if (mpz_sizeinbase (SCM_I_BIG_MPZ (val), 2)
+             > CHAR_BIT*sizeof (TYPE))
+           goto out_of_range;
+         
+         mpz_export (&n, &count, 1, sizeof (TYPE), 0, 0, SCM_I_BIG_MPZ (val));
+
+         if (n >= TYPE_MIN && n <= TYPE_MAX)
+           return n;
+         else
+           goto out_of_range;
+       }
+    }
+  else
+    {
+      scm_wrong_type_arg_msg (NULL, 0, val, "exact integer");
+      return 0;
+    }
+}
+
+SCM
+SCM_FROM_TYPE_PROTO (TYPE val)
+{
+#if SIZEOF_TYPE != 0 && SIZEOF_TYPE < SIZEOF_SCM_T_BITS
+  return SCM_I_MAKINUM (val);
+#else
+  if (SCM_POSFIXABLE (val))
+    return SCM_I_MAKINUM (val);
+  else if (val <= ULONG_MAX)
+    return scm_i_ulong2big (val);
+  else
+    {
+      SCM z = scm_double_cell (scm_tc16_big, 0, 0, 0);
+      mpz_init (SCM_I_BIG_MPZ (z));
+      mpz_import (SCM_I_BIG_MPZ (z), 1, 1, sizeof (TYPE), 0, 0, &val);
+      return z;
+    }
+#endif
+}
+
+#undef TYPE
+#undef TYPE_MIN
+#undef TYPE_MAX
+#undef SIZEOF_TYPE
+#undef SCM_TO_TYPE_PROTO
+#undef SCM_FROM_TYPE_PROTO
+