ctype.h - character types

PROLOG  NAME  SYNOPSIS  DESCRIPTION  APPLICATION USAGE  RATIONALE  FUTURE DIRECTIONS  SEE ALSO  COPYRIGHT 

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.

NAME

ctype.h — character types

SYNOPSIS

#include <ctype.h>

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.1-2017, Section 2.2, The Compilation Environment) to enable the visibility of these symbols in this header.

The <ctype.h> header shall define the locale_t type as described in <locale.h>, representing a locale object.

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.

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);

The <ctype.h> header shall define the following as macros:

int _toupper(int);
int _tolower(int);

The following sections are informative.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

<locale.h>

The System Interfaces volume of POSIX.1-2017, Section 2.2, The Compilation Environment, isalnum(), isalpha(), isascii(), isblank(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(), isxdigit(), mblen(), mbstowcs(), mbtowc(), setlocale(), toascii(), tolower(), _tolower(), toupper(), _toupper(), wcstombs(), wctomb()

COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. 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.opengroup.org/unix/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 .


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