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ICU-597 AS/400 porting changes

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X-SVN-Rev: 3721
This commit is contained in:
George Rhoten 2001-02-22 02:16:33 +00:00
parent 4e4408fe03
commit 90eaef52a3
1 changed files with 13 additions and 0 deletions
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13
icu4c/source/common/unicode/pos400.h
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@ -94,6 +94,19 @@ typedef unsigned long uint32_t;
/*===========================================================================*/
/* See utypes.h for the normal defintion */
/*===========================================================================*/
/*
With the provided macro we should never be out of range of a given segment
(a traditional/typical segment that is). Our segments have 5 bytes for the id
and 3 bytes for the offset. The key is that the casting takes care of only
retrieving the offset portion minus x1000. Hence, the smallest offset seen in
a program is x001000 and when casted to an int would be 0. That's why we can
only add 0xffefff. Otherwise, we would exceed the segment. Yes, 16M is the
magic limitation we in AS/400-land have been previously limited to. But now
we have teraspace storage. Currently this will support up to 2G. I did not
take the time to provide this additional check (what kind of pointer and then
different calculation).
*/
#ifndef U_MAX_PTR
#define U_MAX_PTR(ptr) ((void*)(((void*)ptr)-((int32_t)(ptr))+((int32_t)0xffefff)))
#endif