.\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
.\"
+.\" %%%LICENSE_START(VERBATIM)
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
-.\" License.
+.\" %%%LICENSE_END
.\"
.\" Modified Sat Jul 24 19:10:00 1993 by Rik Faith (faith@cs.unc.edu)
.\" Modified Sun Aug 21 17:51:50 1994 by Rik Faith (faith@cs.unc.edu)
.\" Modified Sat Sep 2 21:52:01 1995 by Jim Van Zandt <jrv@vanzandt.mv.com>
.\" Modified Mon May 27 22:55:26 1996 by Martin Schulze (joey@linux.de)
.\"
-.TH ISALPHA 3 2010-09-20 "GNU" "Linux Programmer's Manual"
+.TH ISALPHA 3 2014-03-18 "GNU" "Linux Programmer's Manual"
.SH NAME
isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph, islower,
-isprint, ispunct, isspace, isupper, isxdigit \- character
-classification routines
+isprint, ispunct, isspace, isupper, isxdigit,
+isalnum_l, isalpha_l, isascii_l, isblank_l, iscntrl_l,
+isdigit_l, isgraph_l, islower_l,
+isprint_l, ispunct_l, isspace_l, isupper_l, isxdigit_l
+\- character classification functions
.SH SYNOPSIS
.nf
.B #include <ctype.h>
.sp
-.BI "int isalnum(int " "c" );
-.br
-.BI "int isalpha(int " "c" );
-.br
-.BI "int isascii(int " "c" );
-.br
-.BI "int isblank(int " "c" );
-.br
-.BI "int iscntrl(int " "c" );
-.br
-.BI "int isdigit(int " "c" );
-.br
-.BI "int isgraph(int " "c" );
-.br
-.BI "int islower(int " "c" );
-.br
-.BI "int isprint(int " "c" );
-.br
-.BI "int ispunct(int " "c" );
-.br
-.BI "int isspace(int " "c" );
-.br
-.BI "int isupper(int " "c" );
-.br
-.BI "int isxdigit(int " "c" );
+.BI "int isalnum(int " c );
+.BI "int isalpha(int " c );
+.BI "int iscntrl(int " c );
+.BI "int isdigit(int " c );
+.BI "int isgraph(int " c );
+.BI "int islower(int " c );
+.BI "int isprint(int " c );
+.BI "int ispunct(int " c );
+.BI "int isspace(int " c );
+.BI "int isupper(int " c );
+.BI "int isxdigit(int " c );
+
+.BI "int isascii(int " c );
+.BI "int isblank(int " c );
+
+.BI "int isalnum_l(int " c ", locale_t " locale );
+.BI "int isalpha_l(int " c ", locale_t " locale );
+.BI "int isblank_l(int " c ", locale_t " locale );
+.BI "int iscntrl_l(int " c ", locale_t " locale );
+.BI "int isdigit_l(int " c ", locale_t " locale );
+.BI "int isgraph_l(int " c ", locale_t " locale );
+.BI "int islower_l(int " c ", locale_t " locale );
+.BI "int isprint_l(int " c ", locale_t " locale );
+.BI "int ispunct_l(int " c ", locale_t " locale );
+.BI "int isspace_l(int " c ", locale_t " locale );
+.BI "int isupper_l(int " c ", locale_t " locale );
+.BI "int isxdigit_l(int " c ", locale_t " locale );
+
+.BI "int isascii_l(int " c ", locale_t " locale );
.fi
.sp
.in -4n
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE
.br
.RE
+
.BR isblank ():
.RS 4
_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
or
.I cc\ -std=c99
.RE
+
+.BR isalnum_l (),
+.BR isalpha_l (),
+.BR isblank_l (),
+.BR iscntrl_l (),
+.BR isdigit_l (),
+.BR isgraph_l (),
+.BR islower_l (),
+.BR isprint_l (),
+.BR ispunct_l (),
+.BR isspace_l (),
+.BR isupper_l (),
+.BR isxdigit_l ():
+.PD 0
+.RS 4
+.TP
+Since glibc 2.10:
+_XOPEN_SOURCE\ >=\ 700
+.TP
+Before glibc 2.10:
+_GNU_SOURCE
+.RE
+.PD
+
+.BR isascii_l ():
+.PD 0
+.RS 4
+.TP
+Since glibc 2.10:
+_XOPEN_SOURCE\ >=\ 700 && (_SVID_SOURCE || _BSD_SOURCE)
+.TP
+Before glibc 2.10:
+_GNU_SOURCE
+.RE
+.PD
.ad
.SH DESCRIPTION
These functions check whether
.I unsigned char
or
.BR EOF ,
-falls into a certain character class according to the current locale.
+falls into a certain character class according to the specified locale.
+The functions without the
+"_l" suffix perform the check based on the current locale.
+
+The functions with the "_l" suffix perform the check
+based on the locale specified by the locale object
+.IR locale .
+The behavior of these functions is undefined if
+.I locale
+is the special locale object
+.B LC_GLOBAL_LOCALE
+(see
+.BR duplocale (3))
+or is not a valid locale object handle.
+
+The list below explains the operation of the functions without
+the "_l" suffix;
+the functions with the "_l" suffix differ only in using the locale object
+.I locale
+instead of the current locale.
.TP
.BR isalnum ()
checks for an alphanumeric character; it is equivalent to
.BI "(isupper(" c ") || islower(" c "))" \fR.
In some locales, there may be additional characters for which
.BR isalpha ()
-is true\(emletters which are neither upper case nor lower
-case.
+is true\(emletters which are neither uppercase nor lowercase.
.TP
.BR isascii ()
checks whether \fIc\fP is a 7-bit
checks for any printable character except space.
.TP
.BR islower ()
-checks for a lower-case character.
+checks for a lowercase character.
.TP
.BR isprint ()
checks for any printable character including space.
checks for an uppercase letter.
.TP
.BR isxdigit ()
-checks for a hexadecimal digits, that is, one of
+checks for hexadecimal digits, that is, one of
.br
.BR "0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F" .
-.SH "RETURN VALUE"
+.SH RETURN VALUE
The values returned are nonzero if the character
.I c
-falls into the tested class, and a zero value
-if not.
-.SH "CONFORMING TO"
-C99, 4.3BSD.
-C89 specifies all of these functions except
+falls into the tested class, and zero if not.
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The
+.BR isalnum (),
+.BR isalpha (),
+.BR isascii (),
+.BR isblank (),
+.BR iscntrl (),
+.BR isdigit (),
+.BR isgraph (),
+.BR islower (),
+.BR isprint (),
+.BR ispunct (),
+.BR isspace (),
+.BR isupper (),
+and
+.BR isxdigit ()
+functions are thread-safe.
+.\" FIXME: need a thread-safety statement about the *_l functions
+.SH VERSIONS
+.BR isalnum_l (),
+.BR isalpha_l (),
+.BR isblank_l (),
+.BR iscntrl_l (),
+.BR isdigit_l (),
+.BR isgraph_l (),
+.BR islower_l (),
+.BR isprint_l (),
+.BR ispunct_l (),
+.BR isspace_l (),
+.BR isupper_l (),
+.BR isxdigit_l (),
+and
+.BR isascii_l ()
+are available since glibc 2.3.
+.SH CONFORMING TO
+C89 specifies
+.BR isalnum (),
+.BR isalpha (),
+.BR iscntrl (),
+.BR isdigit (),
+.BR isgraph (),
+.BR islower (),
+.BR isprint (),
+.BR ispunct (),
+.BR isspace (),
+.BR isupper (),
+and
+.BR isxdigit (),
+but not
.BR isascii ()
and
.BR isblank ().
+POSIX.1-2001
+also specifies those functions, and also
.BR isascii ()
-is a BSD extension
-and is also an SVr4 extension.
-.BR isblank ()
-conforms to POSIX.1-2001 and C99 7.4.1.3.
+(as an XSI extension)
+and
+.BR isblank ().
+C99 specifies all of the preceding functions, except
+.BR isascii ().
+
POSIX.1-2008 marks
.BR isascii ()
as obsolete,
noting that it cannot be used portably in a localized application.
+
+POSIX.1-2008 specifies
+.BR isalnum_l (),
+.BR isalpha_l (),
+.BR isblank_l (),
+.BR iscntrl_l (),
+.BR isdigit_l (),
+.BR isgraph_l (),
+.BR islower_l (),
+.BR isprint_l (),
+.BR ispunct_l (),
+.BR isspace_l (),
+.BR isupper_l (),
+and
+.BR isxdigit_l ().
+
+.BR isascii_l ()
+is a GNU extension.
.SH NOTES
-The details of what characters belong into which class depend on the current
+The details of what characters belong to which class depend on the
locale.
For example,
.BR isupper ()
will not recognize an A-umlaut (\(:A) as an uppercase letter in the default
.B "C"
locale.
-.SH "SEE ALSO"
+.SH SEE ALSO
.BR iswalnum (3),
.BR iswalpha (3),
.BR iswblank (3),
.BR iswspace (3),
.BR iswupper (3),
.BR iswxdigit (3),
+.BR newlocale (3),
.BR setlocale (3),
+.BR uselocale (3),
.BR toascii (3),
.BR tolower (3),
.BR toupper (3),
.BR ascii (7),
.BR locale (7)
+.SH COLOPHON
+This page is part of release 3.68 of the Linux
+.I man-pages
+project.
+A description of the project,
+information about reporting bugs,
+and the latest version of this page,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.
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