isascii(3) - NetBSD Manual Pages

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ISASCII(3)              NetBSD Library Functions Manual             ISASCII(3)

isascii -- test for ASCII character
Standard C Library (libc, -lc)
#include <ctype.h> int isascii(int c);
The isascii() function tests for an ASCII character, which is any charac- ter with a value in the range from 0 to 127, inclusive. The isascii() function is defined on all integer values.
ctype(3), 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'') and IEEE Std 1003.1-2001 (``POSIX.1''). The IEEE Std 1003.1-2008 (``POSIX.1'') revision however marked it as obsolete, noting that isascii() cannot be used portably in a localized application. NetBSD 10.99 February 21, 2021 NetBSD 10.99
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