diff options
| author | Paul Eggert <eggert@twinsun.com> | 1996-12-30 08:07:51 +0000 |
|---|---|---|
| committer | Paul Eggert <eggert@twinsun.com> | 1996-12-30 08:07:51 +0000 |
| commit | d137ae2faa5be6a2af07e60c103f39264ce3829b (patch) | |
| tree | 85249e63ee2f445d2f9cbc9f5db767f590759cd3 /src/floatfns.c | |
| parent | 22a8b81674876a700db26e237270c0fc6c66ae01 (diff) | |
| download | emacs-d137ae2faa5be6a2af07e60c103f39264ce3829b.tar.gz | |
<float.h>: Include if STDC_HEADERS.
(IEEE_FLOATING_POINT): New symbol.
(Ffloor): Test for division by 0 only if ! IEEE_FLOATING_POINT.
(fmod_float): New function.
Diffstat (limited to 'src/floatfns.c')
| -rw-r--r-- | src/floatfns.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/src/floatfns.c b/src/floatfns.c index 87eb1f129aa..452bdc2ea54 100644 --- a/src/floatfns.c +++ b/src/floatfns.c @@ -52,6 +52,20 @@ Boston, MA 02111-1307, USA. */ #ifdef LISP_FLOAT_TYPE +#if STDC_HEADERS +#include <float.h> +#endif + +/* If IEEE_FLOATING_POINT isn't defined, default it from FLT_*. */ +#ifndef IEEE_FLOATING_POINT +#if (FLT_RADIX == 2 && FLT_MANT_DIG == 24 \ + && FLT_MIN_EXP == -125 && FLT_MAX_EXP == 128) +#define IEEE_FLOATING_POINT 1 +#else +#define IEEE_FLOATING_POINT 0 +#endif +#endif + /* Work around a problem that happens because math.h on hpux 7 defines two static variables--which, in Emacs, are not really static, because `static' is defined as nothing. The problem is that they are @@ -752,7 +766,7 @@ With optional DIVISOR, return the largest integer no greater than ARG/DIVISOR.") f1 = FLOATP (arg) ? XFLOAT (arg)->data : XINT (arg); f2 = (FLOATP (divisor) ? XFLOAT (divisor)->data : XINT (divisor)); - if (f2 == 0) + if (! IEEE_FLOATING_POINT && f2 == 0) Fsignal (Qarith_error, Qnil); IN_FLOAT2 (f1 = floor (f1 / f2), "floor", arg, divisor); @@ -791,6 +805,25 @@ With optional DIVISOR, return the largest integer no greater than ARG/DIVISOR.") #ifdef LISP_FLOAT_TYPE +Lisp_Object +fmod_float (x, y) + register Lisp_Object x, y; +{ + double f1, f2; + + f1 = FLOATP (x) ? XFLOAT (x)->data : XINT (x); + f2 = FLOATP (y) ? XFLOAT (y)->data : XINT (y); + + if (! IEEE_FLOATING_POINT && f2 == 0) + Fsignal (Qarith_error, Qnil); + + /* If the "remainder" comes out with the wrong sign, fix it. */ + IN_FLOAT2 ((f1 = fmod (f1, f2), + f1 = (f2 < 0 ? f1 > 0 : f1 < 0) ? f1 + f2 : f1), + "mod", x, y); + return make_float (f1); +} + DEFUN ("round", Fround, Sround, 1, 1, 0, "Return the nearest integer to ARG.") (arg) |