Changeset c8bb1633 in mainline for uspace/lib/posix/include/posix/float.h

Timestamp:

2013-07-10T08:58:49Z (12 years ago)

Author:

Vojtech Horky <vojtechhorky@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

3908355, 4c53333

Parents:

30c1b75 (diff), 98abd40 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Extending POSIX library

Merge from lp:~vojtech-horky/helenos/gcc-port.

This is work-in-progress merge from branch aimed at bringing GCC to run
inside HelenOS.

The most notable change is dealing with the name clashes in libposix and
libc. For ported applications, the libposix headers looks as normal
POSIX headers and there is no need to do preprocessor-based renaming inside
the ported application. The renaming is done inside object files instead.
See revision 1745 in lp:~vojtech-horky/helenos/gcc-port [1] for more
detailed explanation.
The solution is definitely not perfect but shall deal with the naming
conflicts in much safer manner than using the redefines.

There were some other changes as well, mostly small ones.

• Add some functions, some as ToDo ones (i.e. empty implementation).
• Add more POSIX headers, split some existing.

[1] ​http://bazaar.launchpad.net/~vojtech-horky/helenos/gcc-port/revision/1745

File:

• uspace/lib/posix/include/posix/float.h (modified) (1 diff)

uspace/lib/posix/include/posix/float.h

@@ -61 +61 @@
         #undef FLT_RADIX
         #define FLT_RADIX __FLT_RADIX__
+#else
+/* For something else than GCC, following definitions are provided.
+ * They are intentionally guarded by the given macro to ensure that anyone
+ * who wants them states this explicitly.
+ *
+ * The values are the ones GCC prints when compiled on i686 Linux.
+ *
+ * WARNING: the values are not accurate (especially the long double ones)!
+ *
+ */
+#ifdef FLOAT_H_YES_I_REALLY_WANT_LIMITS
+/* float limits */
+#define FLT_MIN 1.1754943508222875079687365372222456778186655567720875215087517062784172594547271728515625e-38
+#define FLT_MAX 340282346638528859811704183484516925440
+
+/* double limits */
+#define DBL_MIN 2.2250738585072013830902327173324040642192159804623318305533274168872044348139181958542831590125110205640673397310358110051524341615534601088560123853777188211307779935320023304796101474425836360719216e-308
+#define DBL_MAX 1.7976931348623157081452742373170435679807056752584499659891747680315726078002853876058955863276687817154045895351438246423432132688946418276846754670353751698604991057655128207624549009038932894407587e+308
+
+/* long double limits */
+#define LDBL_MIN 3.3621031431120935062626778173217526025980793448464712401088272298087426993907289670430927063650562228625019066688234732270901114717276781407474941951906317291667263914849985862188944930687409323125832e-4932L
+#define LDBL_MAX 1.1897314953572317650212638530309702051690633222946242004403237338917370055229707226164102903365288828535456978074955773144274431536702884341981255738537436786735932007069732632019159182829615243655295e+4932L
+
+/* epsilons */
+#define FLT_EPSILON 1.1920928955078125e-07
+#define DBL_EPSILON 2.220446049250313080847263336181640625e-16
+#define LDBL_EPSILON 1.08420217248550443400745280086994171142578125e-19L
+
+/* float radix */
+#define FLT_RADIX 2
+
+/* mantisa */
+#define FLT_MANT_DIG 24
+#define DBL_MANT_DIG 53
+#define LDBL_MANT_DIG 64
+
+/* exponents */
+#define DBL_MIN_EXP -1021
+#define DBL_MAX_EXP 1024
+
 #endif
+
+#endif /* __GNUC__ */
 
 #endif /* POSIX_FLOAT_H_ */