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ICU-827 Move U_MAX_PTR from utypes.h to putil.h because it's a private platform macro

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X-SVN-Rev: 4291
This commit is contained in:
George Rhoten 2001-03-22 23:47:40 +00:00
parent 0378c92ba4
commit fc9385706c
1 changed files with 20 additions and 0 deletions
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20
icu4c/source/common/unicode/putil.h
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@ -291,4 +291,24 @@ u_getVersion(UVersionInfo versionArray);
# error Unknown charset family!
#endif
/**
* Maximum value of a (void*) - use to indicate the limit of an 'infinite' buffer.
* In fact, buffer sizes must not exceed 2GB so that the difference between
* the buffer limit and the buffer start can be expressed in an int32_t.
*
* The definition of U_MAX_PTR must fulfill the following conditions:
* - return the largest possible pointer greater than base
* - return a valid pointer according to the machine architecture (AS/400, 64-bit, etc.)
* - avoid wrapping around at high addresses
* - make sure that the returned pointer is not farther from base than 0x7fffffff
*
* For some architectures (like AS/400), a custom macro must be defined in platform.h.in or similar.
*
* @param base The beginning of a buffer to find the maximum offset from
* @internal
*/
#ifndef U_MAX_PTR
# define U_MAX_PTR(base) ((void *)(((char *)(base)+0x7fffffff)>(char *)(base) ? ((char *)(base)+0x7fffffff) : (char *)-1))
#endif
#endif