ISASCII(3) BSD Programmer's Manual ISASCII(3)
isascii - ASCII character test
#include <ctype.h> int isascii(int c);
The isascii() function tests for an ASCII character, which is any charac- ter with a value less than or equal to 0177.
The isascii() macro returns zero if the character tests false or non-zero if the character tests true.
isalnum(3), isalpha(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)
The isascii() function conforms to X/Open Portability Guide Issue 4 ("XPG4").
The argument to isascii() must be EOF or representable as an unsigned char; otherwise, the result is undefined. MirOS BSD #10-current May 2, 1991 1
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