Character Codes

The unibyte and multibyte text representations use different character codes. The valid character codes for unibyte representation range from 0 to 255--the values that can fit in one byte. The valid character codes for multibyte representation range from 0 to 524287, but not all values in that range are valid. In particular, the values 128 through 255 are not legitimate in multibyte text (though they can occur in "raw bytes"; see section Explicit Encoding and Decoding). Only the ASCII codes 0 through 127 are fully legitimate in both representations.

Function: char-valid-p charcode

This returns t if charcode is valid for either one of the two text representations.

(char-valid-p 65)
     => t
(char-valid-p 256)
     => nil
(char-valid-p 2248)
     => t

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