Reimplement isinf/isnan/fpclassify.

Also move isinf and isnan into libc like everyone else.

Also move fpclassify to libc like the BSDs (but unlike glibc). We need
this to be able to upgrade our float/double/long double parsing to gdtoa.

Also add some missing aliases. We now have all of:

  isnan, __isnan, isnanf, __isnanf, isnanl, __isnanl,
  isinf, __isinf, isinff, __isinff, isinfl, __isinfl,
  __fpclassify, __fpclassifyd, __fpclassifyf, __fpclassifyl.

Bug: 13469877
Change-Id: I407ffbac06c765a6c5fffda8106c37d7db04f27d

1 files changed, 2 insertions, 33 deletions

diff --git a/libc/stdio/vfprintf.c b/libc/stdio/vfprintf.c
index d2c315daa..e33c10504 100644
--- a/libc/stdio/vfprintf.c
+++ b/libc/stdio/vfprintf.c
@@ -154,12 +154,6 @@ static int exponent(char *, int, int);
 
 #define STATIC_ARG_TBL_SIZE 8	/* Size of static argument table. */
 
-/* BIONIC: do not link libm for only two rather simple functions */
-#ifdef FLOATING_POINT
-static  int  _my_isinf(double);
-static  int  _my_isnan(double);
-#endif
-
 /*
  * Macros for converting digits to letters and vice versa
  */
@@ -543,14 +537,14 @@ reswitch:	switch (ch) {
 			}
 
 			/* do this before tricky precision changes */
-			if (_my_isinf(_double)) {
+			if (isinf(_double)) {
 				if (_double < 0)
 					sign = '-';
 				cp = "Inf";
 				size = 3;
 				break;
 			}
-			if (_my_isnan(_double)) {
+			if (isnan(_double)) {
 				cp = "NaN";
 				size = 3;
 				break;
@@ -1331,29 +1325,4 @@ exponent(char *p0, int exp, int fmtch)
 	return (p - p0);
 }
 
-
-/* BIONIC */
-#include <machine/ieee.h>
-typedef union {
-    double              d;
-    struct ieee_double  i;
-} ieee_u;
-
-static int
-_my_isinf (double  value)
-{
-    ieee_u   u;
-
-    u.d = value;
-    return (u.i.dbl_exp == 2047 && u.i.dbl_frach == 0 && u.i.dbl_fracl == 0);
-}
-
-static int
-_my_isnan (double  value)
-{
-    ieee_u   u;
-
-    u.d = value;
-    return (u.i.dbl_exp == 2047 && (u.i.dbl_frach != 0 || u.i.dbl_fracl != 0));
-}
 #endif /* FLOATING_POINT */