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iswalpha(3) Library Functions Manual iswalpha(3)
iswalpha - test for alphabetic wide character
Standard C library (libc, -lc)
#include <wctype.h> int iswalpha(wint_t wc);
The iswalpha() function is the wide-character equivalent of the isalpha(3) function. It tests whether wc is a wide character belonging to the wide-character class "alpha". The wide-character class "alpha" is a subclass of the wide- character class "alnum", and therefore also a subclass of the wide-character class "graph" and of the wide-character class "print". Being a subclass of the wide-character class "print", the wide- character class "alpha" is disjoint from the wide-character class "cntrl". Being a subclass of the wide-character class "graph", the wide- character class "alpha" is disjoint from the wide-character class "space" and its subclass "blank". Being a subclass of the wide-character class "alnum", the wide- character class "alpha" is disjoint from the wide-character class "punct". The wide-character class "alpha" is disjoint from the wide- character class "digit". The wide-character class "alpha" contains the wide-character classes "upper" and "lower". The wide-character class "alpha" always contains at least the letters 'A' to 'Z' and 'a' to 'z'.
The iswalpha() function returns nonzero if wc is a wide character belonging to the wide-character class "alpha". Otherwise, it returns zero.
For an explanation of the terms used in this section, see attributes(7). ┌───────────────────────────────┬───────────────┬────────────────┐ │Interface │ Attribute │ Value │ ├───────────────────────────────┼───────────────┼────────────────┤ │iswalpha() │ Thread safety │ MT-Safe locale │ └───────────────────────────────┴───────────────┴────────────────┘
C11, POSIX.1-2008.
POSIX.1-2001, C99.
The behavior of iswalpha() depends on the LC_CTYPE category of the current locale.
isalpha(3), iswctype(3)
Linux man-pages 6.04 2023-03-30 iswalpha(3)
Pages that refer to this page: isalpha(3), iswctype(3)