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 V2_chap02(3)) 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);

The following sections are informative.