.\"	$OpenBSD: isgraph.3,v 1.12 2017/09/05 03:16:13 schwarze Exp $
.\"
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.\" Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
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.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
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.Dd $Mdocdate: September 5 2017 $
.Dt ISGRAPH 3
.Os
.Sh NAME
.Nm isgraph ,
.Nm isgraph_l
.Nd printing single-byte character test (space character exclusive)
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn isgraph "int c"
.Ft int
.Fn isgraph_l "int c" "locale_t locale"
.Sh DESCRIPTION
The
.Fn isgraph
and
.Fn isgraph_l
functions tests for any printing character except space
.Pq Sq \ \& .
.Pp
In the C locale, the complete list of printing characters
consists of the characters numbered 0x21\(en0x7e, which is
the union of the characters for which
.Xr isalnum 3
or
.Xr ispunct 3
is true.
.Ox
always uses the C locale for these functions,
ignoring the global locale, the thread-specific locale, and the
.Fa locale
argument.
.Sh RETURN VALUES
These functions return zero if the character tests false or
non-zero if the character tests true.
.Sh ENVIRONMENT
On systems supporting non-ASCII single-byte character encodings,
results of these functions may differ, and the results of
.Fn isgraph
may depend on the
.Ev LC_CTYPE
.Xr locale 1 .
.Sh SEE ALSO
.Xr isalnum 3 ,
.Xr isalpha 3 ,
.Xr isascii 3 ,
.Xr isblank 3 ,
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isspace 3 ,
.Xr isupper 3 ,
.Xr iswgraph 3 ,
.Xr isxdigit 3 ,
.Xr stdio 3 ,
.Xr toascii 3 ,
.Xr tolower 3 ,
.Xr toupper 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn isgraph
function conforms to
.St -ansiC ,
and
.Fn isgraph_l
to
.St -p1003.1-2008 .
.Sh HISTORY
The
.Fn isgraph
function first appeared in
.At III ,
and
.Fn isgraph_l
has been available since
.Ox 6.2 .
.Sh CAVEATS
The argument
.Fa c
must be
.Dv EOF
or representable as an
.Li unsigned char ;
otherwise, the result is undefined.