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Character case mapping functions

Earlier libraries had (almost equivalent) macros, _tolower and _toupper, for these functions. The Standard now permits any library function to be additionally implemented as a macro; the underlying function must still be present. _toupper and _tolower are thus unnecessary and were dropped as part of the general standardization of library macros.

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Pete Jinks
Fri Jan 19 12:31:56 GMT 1996