'\" et

.TH ctype.h "0P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"

.SH PROLOG

This manual page is part of the POSIX Programmer's Manual.

The Linux implementation of this interface may differ (consult

the corresponding Linux manual page for details of Linux behavior),

or the interface may not be implemented on Linux.

.SH NAME

ctype.h

\(em character types

.SH SYNOPSIS

.LP

.nf

#include <ctype.h>

.fi

.SH DESCRIPTION

Some of the functionality described on this reference page extends the

ISO\ C standard. Applications shall define the appropriate feature test macro

(see the System Interfaces volume of POSIX.1\(hy2008,

.IR "Section 2.2" ", " "The Compilation Environment")

to enable the visibility of these symbols in this header.

.P

The

.IR <ctype.h> 

header shall define the

.BR locale_t

type as described in

.IR <locale.h> ,

representing a locale object.

.P

The following shall be declared as functions and may also be defined as

macros. Function prototypes shall be provided for use with ISO\ C standard

compilers.

.sp

.RS 4

.nf

\fB

int   isalnum(int);

int   isalnum_l(int, locale_t);

int   isalpha(int);

int   isalpha_l(int, locale_t);

int   isascii(int);

int   isblank(int);

int   isblank_l(int, locale_t);

int   iscntrl(int);

int   iscntrl_l(int, locale_t);

int   isdigit(int);

int   isdigit_l(int, locale_t);

int   isgraph(int);

int   isgraph_l(int, locale_t);

int   islower(int);

int   islower_l(int, locale_t);

int   isprint(int);

int   isprint_l(int, locale_t);

int   ispunct(int);

int   ispunct_l(int, locale_t);

int   isspace(int);

int   isspace_l(int, locale_t);

int   isupper(int);

int   isupper_l(int, locale_t);

int   isxdigit(int);

int   isxdigit_l(int, locale_t);

int   toascii(int);

int   tolower(int);

int   tolower_l(int, locale_t);

int   toupper(int);

int   toupper_l(int, locale_t);

.fi \fR

.P

.RE

.P

The

.IR <ctype.h> 

header shall define the following as macros:

.sp

.RS 4

.nf

\fB

int   _toupper(int);

int   _tolower(int);

.fi \fR

.P

.RE

.LP

.IR "The following sections are informative."

.SH "APPLICATION USAGE"

None.

.SH RATIONALE

None.

.SH "FUTURE DIRECTIONS"

None.

.SH "SEE ALSO"

.IR "\fB<locale.h>\fP"

.P

The System Interfaces volume of POSIX.1\(hy2008,

.IR "Section 2.2" ", " "The Compilation Environment",

.IR "\fIisalnum\fR\^(\|)",

.IR "\fIisalpha\fR\^(\|)",

.IR "\fIisascii\fR\^(\|)",

.IR "\fIisblank\fR\^(\|)",

.IR "\fIiscntrl\fR\^(\|)",

.IR "\fIisdigit\fR\^(\|)",

.IR "\fIisgraph\fR\^(\|)",

.IR "\fIislower\fR\^(\|)",

.IR "\fIisprint\fR\^(\|)",

.IR "\fIispunct\fR\^(\|)",

.IR "\fIisspace\fR\^(\|)",

.IR "\fIisupper\fR\^(\|)",

.IR "\fIisxdigit\fR\^(\|)",

.IR "\fImblen\fR\^(\|)",

.IR "\fImbstowcs\fR\^(\|)",

.IR "\fImbtowc\fR\^(\|)",

.IR "\fIsetlocale\fR\^(\|)",

.IR "\fItoascii\fR\^(\|)",

.IR "\fItolower\fR\^(\|)",

.IR "\fI_tolower\fR\^(\|)",

.IR "\fItoupper\fR\^(\|)",

.IR "\fI_toupper\fR\^(\|)",

.IR "\fIwcstombs\fR\^(\|)",

.IR "\fIwctomb\fR\^(\|)"

.SH COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form

from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology

-- Portable Operating System Interface (POSIX), The Open Group Base

Specifications Issue 7, Copyright (C) 2013 by the Institute of

Electrical and Electronics Engineers, Inc and The Open Group.

(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the

event of any discrepancy between this version and the original IEEE and

The Open Group Standard, the original IEEE and The Open Group Standard

is the referee document. The original Standard can be obtained online at

http://www.unix.org/online.html .

Any typographical or formatting errors that appear

in this page are most likely

to have been introduced during the conversion of the source files to

man page format. To report such errors, see

https://www.kernel.org/doc/man-pages/reporting_bugs.html .