Functions for reading mpz_t from wide character string

[John Scott]

Hi,

It doesn't appear that GMP has a function to read from a wide string and for 
my use case a function like gmp_swscanf would be appreciated. Even if I were 
to convert to a multibyte string I'm not sure whether gmp_sscanf can handle 
that, for example on platforms where __STDC_MB_MIGHT_NEQ_WC__ may be defined.

In fact I can't find a bignum library that has such a function, so maybe I'm 
going about this wrong. I don't have any code with substance to share, but I'm 
working on writing a calculator in C and writing the lexing and parsing bits. 
I think working with wide characters are my best choice for ignoring locales' 
decimal separators, character classification, etc., but corrections and 
suggestions would be appreciated.
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