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isextalnum |
Function (Macro) |
Checks whether a character is an extended alphanumeric.
isextalnum returns nonzero if c is a symbol which may be used in variable names,
including ordinary alphanumerics (see isalnum), underscore ('_') and
foreign alphanumerics (see isfrgnalnum), otherwise it returns zero.
It is an inline function which is implemented using GNU C smart macros and a library variable. The first call of isextalnum
expands to a large code, but any next call of it expands to a relatively small code.