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Revision 1.13, Thu Oct 5 22:34:52 2006 UTC (13 years, 2 months ago) by rillig
Branch: MAIN
CVS Tags: wrstuden-fixsa-newbase, wrstuden-fixsa-base-1, wrstuden-fixsa-base, wrstuden-fixsa, netbsd-4-base, netbsd-4-0-RELEASE, netbsd-4-0-RC5, netbsd-4-0-RC4, netbsd-4-0-RC3, netbsd-4-0-RC2, netbsd-4-0-RC1, netbsd-4-0-1-RELEASE, netbsd-4-0, netbsd-4
Changes since 1.12: +5 -5 lines

Fixed the wording of the <ctype.h> character classification functions by
always using "function" instead of "macro".

Changed "undefined result" into "undefined behavior" for argument values
outside the valid range. Since the character table is allocated via
malloc(), it _may_ happen that it starts at a page boundary, so that
negative values for the argument result in a segmentation fault. In that
case, there is no result at all.

.\"	$NetBSD: isalnum.3,v 1.13 2006/10/05 22:34:52 rillig Exp $
.\"
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.\" the American National Standards Committee X3, on Information
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.\"     @(#)isalnum.3	5.2 (Berkeley) 6/29/91
.\"
.Dd October 6, 2006
.Dt ISALNUM 3
.Os
.Sh NAME
.Nm isalnum
.Nd alphanumeric character test
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn isalnum "int c"
.Sh DESCRIPTION
The
.Fn isalnum
function tests for any character for which
.Xr isalpha 3
or
.Xr isdigit 3
is true.
.Sh RETURN VALUES
The
.Fn isalnum
function returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh SEE ALSO
.Xr isalpha 3 ,
.Xr isascii 3 ,
.Xr isblank 3 ,
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr isgraph 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isspace 3 ,
.Xr isupper 3 ,
.Xr isxdigit 3 ,
.Xr stdio 3 ,
.Xr toascii 3 ,
.Xr tolower 3 ,
.Xr toupper 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn isalnum
function conforms to
.St -ansiC .
.Sh CAVEATS
The argument to
.Fn isalnum
must be
.Dv EOF
or representable as an
.Li unsigned char ;
otherwise, the behavior is undefined.