Merge branch 'collectd-4.2' into collectd-4.3

[collectd.git] / src / common.c

diff --git a/src/common.c b/src/common.c
index e805041..3489e8d 100644 (file)
--- a/src/common.c
+++ b/src/common.c
@@ -570,6 +570,83 @@ unsigned long long htonll (unsigned long long n)
 #endif
 } /* unsigned long long htonll */
 
+#if FP_LAYOUT_NEED_NOTHING
+/* Well, we need nothing.. */
+/* #endif FP_LAYOUT_NEED_NOTHING */
+
+#elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
+# if FP_LAYOUT_NEED_ENDIANFLIP
+#  define FP_CONVERT(A) ((((uint64_t)(A) & 0xff00000000000000LL) >> 56) | \
+                         (((uint64_t)(A) & 0x00ff000000000000LL) >> 40) | \
+                         (((uint64_t)(A) & 0x0000ff0000000000LL) >> 24) | \
+                         (((uint64_t)(A) & 0x000000ff00000000LL) >> 8)  | \
+                         (((uint64_t)(A) & 0x00000000ff000000LL) << 8)  | \
+                         (((uint64_t)(A) & 0x0000000000ff0000LL) << 24) | \
+                         (((uint64_t)(A) & 0x000000000000ff00LL) << 40) | \
+                         (((uint64_t)(A) & 0x00000000000000ffLL) << 56))
+# else
+#  define FP_CONVERT(A) ((((uint64_t)(A) & 0xffffffff00000000LL) >> 32) | \
+                         (((uint64_t)(A) & 0x00000000ffffffffLL) << 32))
+# endif
+
+double ntohd (double d)
+{
+       union
+       {
+               uint8_t  byte[8];
+               uint64_t integer;
+               double   floating;
+       } ret;
+
+       ret.floating = d;
+
+       /* NAN in x86 byte order */
+       if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00)
+                       && (ret.byte[2] == 0x00) && (ret.byte[3] == 0x00)
+                       && (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00)
+                       && (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f))
+       {
+               return (NAN);
+       }
+       else
+       {
+               uint64_t tmp;
+
+               tmp = ret.integer;
+               ret.integer = FP_CONVERT (tmp);
+               return (ret.floating);
+       }
+} /* double ntohd */
+
+double htond (double d)
+{
+       union
+       {
+               uint8_t  byte[8];
+               uint64_t integer;
+               double   floating;
+       } ret;
+
+       if (isnan (d))
+       {
+               ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
+               ret.byte[4] = ret.byte[5] = 0x00;
+               ret.byte[6] = 0xf8;
+               ret.byte[7] = 0x7f;
+               return (ret.floating);
+       }
+       else
+       {
+               uint64_t tmp;
+
+               ret.floating = d;
+               tmp = FP_CONVERT (ret.integer);
+               ret.integer = tmp;
+               return (ret.floating);
+       }
+} /* double htond */
+#endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
+
 int format_name (char *ret, int ret_len,
                const char *hostname,
                const char *plugin, const char *plugin_instance,