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ISPRINT(3) Library Functions Manual ISPRINT(3)

isprint, isprint_l
printing single-byte character test (space character inclusive)

#include <ctype.h>
int
isprint(int c);
int
isprint_l(int c, locale_t locale);

The isprint() and isprint_l() functions test for any printing character including space (‘ ’).
In the C locale, the complete list of printing characters consists of the characters numbered 0x20–0x7e, which is the union of the characters for which isalnum(3) or ispunct(3) is true, and the space character. OpenBSD always uses the C locale for these functions, ignoring the global locale, the thread-specific locale, and the locale argument.

These functions return zero if the character tests false or non-zero if the character tests true.

On systems supporting non-ASCII single-byte character encodings, results of these functions may differ, and the results of isprint() may depend on the LC_CTYPE locale(1).

isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), ispunct(3), isspace(3), isupper(3), iswprint(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

The isprint() function conforms to ANSI X3.159-1989 (“ANSI C89”), and isprint_l() to IEEE Std 1003.1-2008 (“POSIX.1”).

The isprint() function first appeared in Version 7 AT&T UNIX, and isprint_l() has been available since OpenBSD 6.2.

The argument c must be EOF or representable as an unsigned char; otherwise, the result is undefined.
September 5, 2017 OpenBSD-current