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Check-in Number:
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4311 | |
| Date: |
2001-Aug-22 22:21:01 (local)
2001-Aug-22 20:21:01 (UTC) |
| User: | simons |
| Branch: | |
| Comment: |
The float2xds_float() routine will break a float number down into
sign, fraction part and exponent. This representation is then used in
the formatting callbacks such as xdr_encode_float(). |
| Tickets: |
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| Inspections: |
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| Files: |
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ossp-pkg/xds/float2xds-float.c -> 1.1
*** /dev/null Sat Nov 23 01:11:26 2024
--- - Sat Nov 23 01:11:29 2024
***************
*** 0 ****
--- 1,71 ----
+ #include "xds_p.h"
+
+ int float2xds_float(xds_float_t* new_num, float num)
+ {
+ const static unsigned int base = 2;
+ size_t i;
+ float tmp;
+
+ /* Handle zero as a special case. */
+
+ if (num == 0.0)
+ {
+ new_num->sign = 0;
+ new_num->fraction = 0;
+ new_num->exponent = -127;
+ return 0;
+ }
+
+ /* Determine the sign of the number. */
+
+ if (num < 0)
+ {
+ new_num->sign = 1;
+ num = 0 - num;
+ }
+ else
+ new_num->sign = 0;
+
+ /* Canonify the number before we convert it. */
+
+ new_num->exponent = 0;
+ while (num < 1)
+ {
+ num *= base;
+ --new_num->exponent;
+ }
+
+ /* Find the exponent. */
+
+ for (i = 0, tmp = 1; i <= 128; ++i, tmp *= base)
+ {
+ if (tmp*base > num)
+ break;
+ }
+ if (i <= 128)
+ {
+ num = num / tmp - 1;
+ new_num->exponent += i;
+ }
+ else
+ return 1;
+
+ /* Calculate the fraction part. */
+
+ for (new_num->fraction = 0, i = 0; i < 23; ++i)
+ {
+ new_num->fraction *= base;
+ if (num >= 1.0 / base)
+ {
+ new_num->fraction |= 1;
+ num = num * base - 1;
+ }
+ else
+ {
+ new_num->fraction |= 0;
+ num *= base;
+ }
+ }
+
+ return 0;
+ }
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