NAME

ctype.h — character types

SYNOPSIS

#include <ctype.h>

DESCRIPTION

^[CX] Some of the functionality described on this reference page extends the ISO C standard. Applications shall define the appropriate feature test macro (see XSH 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);
[CX]
int   isalnum_l(int, locale_t);

int   isalpha(int);
[CX]
int   isalpha_l(int, locale_t);

int   isblank(int);
[CX]
int   isblank_l(int, locale_t);

int   iscntrl(int);
[CX]
int   iscntrl_l(int, locale_t);

int   isdigit(int);
[CX]
int   isdigit_l(int, locale_t);

int   isgraph(int);
[CX]
int   isgraph_l(int, locale_t);

int   islower(int);
[CX]
int   islower_l(int, locale_t);

int   isprint(int);
[CX]
int   isprint_l(int, locale_t);

int   ispunct(int);
[CX]
int   ispunct_l(int, locale_t);

int   isspace(int);
[CX]
int   isspace_l(int, locale_t);

int   isupper(int);
[CX]
int   isupper_l(int, locale_t);

int   isxdigit(int);
[CX]
int   isxdigit_l(int, locale_t);

int   tolower(int);
[CX]
int   tolower_l(int, locale_t);

int   toupper(int);
[CX]
int   toupper_l(int, locale_t);

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

<locale.h>

XSH 2.2 The Compilation Environment, isalnum, isalpha, isblank, iscntrl, isdigit, isgraph, islower, isprint, ispunct, isspace, isupper, isxdigit, mblen, mbstowcs, mbtowc, setlocale, tolower, toupper, wcstombs, wctomb

CHANGE HISTORY

First released in Issue 1. Derived from Issue 1 of the SVID.

Issue 6

Extensions beyond the ISO C standard are marked.

Issue 7

SD5-XBD-ERN-6 is applied, updating the wording regarding the function declarations for consistency.

The *_l() functions are added from The Open Group Technical Standard, 2006, Extended API Set Part 4.

Issue 8

Austin Group Defect 1330 is applied, removing obsolescent interfaces.