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); [OB XSI] int isascii(int); 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); [OB XSI] int toascii(int); int tolower(int); [CX] int tolower_l(int, locale_t); int toupper(int); [CX] int toupper_l(int, locale_t);
The <ctype.h> header shall define the following as macros:
[OB XSI] int _toupper(int); int _tolower(int);
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
XSH V2_chap02(3) , isalnum(3) , isalpha(3) , isascii(3) , isblank(3) , iscntrl(3) , isdigit(3) , isgraph(3) , islower(3) , isprint(3) , ispunct(3) , isspace(3) , isupper(3) , isxdigit(3) , mblen(3) , mbstowcs(3) , mbtowc(3) , setlocale(3) , toascii(3) , tolower(3) , _tolower(3) , toupper(3) , _toupper(3) , wcstombs(3) , wctomb(3)
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.