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Pass an unsigned char to ctype functions#30

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tcunha:ctype-uchar
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Pass an unsigned char to ctype functions#30
tcunha wants to merge 1 commit intoryanflannery:masterfrom
tcunha:ctype-uchar

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@tcunha tcunha commented Dec 16, 2012

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It must be EOF or representable as an unsigned char, otherwise the
result is undefined. Particularly, if char has the same range as signed
char, in which case, it maps negative char values (quite normal outside
7-bit ASCII) to positive unsigned char values.
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