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This page displays the COHERENT manpage for isascii() [Check if a character is an ASCII character].
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isascii() -- ctype Function (libc) Check if a character is an ASCII character #include <ctype.h> int isascii(c) int c; isascii() tests whether c is an ASCII character (0 <= c <= 0177). It returns a number other than zero if c is an ASCII character, and zero if it is not. Many ctype macros fail if passed a non-ASCII value other than EOF. Example For an example of how to use this function, see the entry for ctype.h. See Also ASCII, libc Notes Please note that isascii() is not part of the ANSI standard. Programs that use it may not be portable to all implementations of C.