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.