From: Marcus Boerger <helly@php.net>
Date: Mon, 29 Mar 2004 18:51:47 +0000 (+0000)
Subject: Found a NAN/INF solution that should be portable everywhere(?) (Ard,Marcus)
X-Git-Tag: php-5.0.0RC2RC1~168
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8b15b46aa81bcbc15cb8a7d93fb82d3a06333a2a;p=php

Found a NAN/INF solution that should be portable everywhere(?) (Ard,Marcus)
---

diff --git a/ext/standard/basic_functions.c b/ext/standard/basic_functions.c
index 6cb1a6f422..65da2cf63e 100644
--- a/ext/standard/basic_functions.c
+++ b/ext/standard/basic_functions.c
@@ -952,12 +952,14 @@ static void basic_globals_dtor(php_basic_globals *basic_globals_p TSRMLS_DC)
 
 PHPAPI double php_get_nan()
 {
-#if defined(__i386__) || defined(_X86_) || defined(ALPHA) || defined(_ALPHA) || defined(__alpha)
+#if HAVE_HUGE_VAL_NAN
+	return HUGE_VAL + -HUGE_VAL;
+#elif defined(__i386__) || defined(_X86_) || defined(ALPHA) || defined(_ALPHA) || defined(__alpha)
 	double val;
 	((php_uint32*)&val)[1] = PHP_DOUBLE_QUIET_NAN_HIGH;
 	((php_uint32*)&val)[0] = 0;
 	return val;
-#elif defined(HAVE_ATOF_ACCEPTS_NAN)
+#elif HAVE_ATOF_ACCEPTS_NAN
 	return atof("NAN");
 #else
 	return 0.0/0.0;
@@ -966,12 +968,14 @@ PHPAPI double php_get_nan()
 
 PHPAPI double php_get_inf()
 {
-#if defined(__i386__) || defined(_X86_) || defined(ALPHA) || defined(_ALPHA) || defined(__alpha)
+#if HAVE_HUGE_VAL_NAN
+	return HUGE_VAL;
+#elif defined(__i386__) || defined(_X86_) || defined(ALPHA) || defined(_ALPHA) || defined(__alpha)
 	double val;
 	((php_uint32*)&val)[1] = PHP_DOUBLE_INFINITY_HIGH;
 	((php_uint32*)&val)[0] = 0;
 	return val;
-#elif defined(HAVE_ATOF_ACCEPTS_INF)
+#elif HAVE_ATOF_ACCEPTS_INF
 	return atof("INF");
 #else
 	return 1.0/0.0;
diff --git a/ext/standard/config.m4 b/ext/standard/config.m4
index a2e1e05276..c1b2cd0118 100644
--- a/ext/standard/config.m4
+++ b/ext/standard/config.m4
@@ -391,6 +391,49 @@ if test "$ac_cv_atof_accept_inf" = "yes"; then
   AC_DEFINE([HAVE_ATOF_ACCEPTS_INF], 1, [whether atof() accepts INF])
 fi
 
+AC_CACHE_CHECK(whether HUGE_VAL + -HUGEVAL = NAN, ac_cv_huge_val_nan,[
+  AC_TRY_RUN([
+#include <math.h>
+#include <stdlib.h>
+
+#ifdef HAVE_ISINF
+#define zend_isinf(a) isinf(a)
+#elif defined(INFINITY)
+/* Might not work, but is required by ISO C99 */
+#define zend_isinf(a) (((a)==INFINITY)?1:0)
+#elif defined(HAVE_FPCLASS)
+#define zend_isinf(a) ((fpclass(a) == FP_PINF) || (fpclass(a) == FP_NINF))
+#else
+#define zend_isinf(a) 0
+#endif
+
+#ifdef HAVE_ISNAN
+#define zend_isnan(a) isnan(a)
+#elif defined(NAN)
+#define zend_isnan(a) (((a)==NAN)?1:0)
+#elif defined(HAVE_FPCLASS)
+#define zend_isnan(a) ((fpclass(a) == FP_SNAN) || (fpclass(a) == FP_QNAN))
+#else
+#define zend_isnan(a) 0
+#endif
+
+int main(int argc, char** argv)
+{
+	return zend_isinf(HUGE_VAL) && zend_isnan(HUGE_VAL + -HUGE_VAL) ? 0 : 1;
+}
+  ],[
+      ac_cv_huge_val_nan=yes
+  ],[
+      ac_cv_huge_val_nan=no
+  ],[
+      ac_cv_huge_val_nan=yes
+  ])
+])
+dnl This is the most probable fallback so we assume yes in case of cross compile.
+if test "$ac_cv_huge_val_nan" = "yes"; then
+  AC_DEFINE([HAVE_HUGE_VAL_NAN], 1, [whether HUGE_VAL + -HUGEVAL = NAN])
+fi
+
 PHP_CHECK_I18N_FUNCS
 
 PHP_NEW_EXTENSION(standard, array.c base64.c basic_functions.c browscap.c crc32.c crypt.c \