WCTYPE(3) Library Functions Manual WCTYPE(3)
NAME
wctypeget character class identifier by name
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <wctype.h>
wctype_t
wctype(const char *charclass);
DESCRIPTION
The wctype() function returns a character class identifier corresponding to the locale-specific character class name charclass. This identifier can be used in subsequent calls of iswctype(). The following names are defined in all locales:
alnum alpha blank cntrl digit graph lower print punct space upper xdigit
 
The behaviour of wctype() is affected by the LC_CTYPE category of the current locale.
RETURN VALUES
wctype() returns:
0
If charclass does not correspond to a valid character class name.
non-zero
A character class identifier corresponding to charclass.
 
Note: wctype_t is a scalar type, e.g., a pointer.
ERRORS
No errors are defined.
SEE ALSO
STANDARDS
The wctype() function conforms to ISO/IEC 9899/AMD1:1995 (“ISO C90”).