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ISGRAPH(3) Library Functions Manual ISGRAPH(3)

isgraph, isgraph_l
printing single-byte character test (space character exclusive)

#include <ctype.h>
isgraph(int c);
isgraph_l(int c, locale_t locale);

The isgraph() and isgraph_l() functions tests for any printing character except space (‘ ’).
In the C locale, the complete list of printing characters consists of the characters numbered 0x21–0x7e, which is the union of the characters for which isalnum(3) or ispunct(3) is true. 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 isgraph() may depend on the LC_CTYPE locale(1).

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

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

The isgraph() function first appeared in AT&T System III UNIX, and isgraph_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