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ISWALNUM(3) FreeBSD Library Functions Manual ISWALNUM(3) NAME iswalnum, iswalnum_l, iswalpha, iswalpha_l, iswblank, iswblank_l, iswcntrl, iswcntrl_l, iswdigit, iswdigit_l, iswgraph, iswgraph_l, iswlower, iswlower_l, iswprint, iswprint_l, iswpunct, iswpunct_l, iswspace, iswspace_l, iswupper, iswupper_l, iswxdigit, iswxdigit_l - wide-character classification utilities SYNOPSIS #include <wctype.h> int iswalnum(wint_t wc); int iswalnum_l(wint_t wc, locale_t locale); int iswalpha(wint_t wc); int iswalpha_l(wint_t wc, locale_t locale); int iswblank(wint_t wc); int iswblank_l(wint_t wc, locale_t locale); int iswcntrl(wint_t wc); int iswcntrl_l(wint_t wc, locale_t locale); int iswdigit(wint_t wc); int iswdigit_l(wint_t wc, locale_t locale); int iswgraph(wint_t wc); int iswgraph_l(wint_t wc, locale_t locale); int iswlower(wint_t wc); int iswlower_l(wint_t wc, locale_t locale); int iswprint(wint_t wc); int iswprint_l(wint_t wc, locale_t locale); int iswpunct(wint_t wc); int iswpunct_l(wint_t wc, locale_t locale); int iswspace(wint_t wc); int iswspace_l(wint_t wc, locale_t locale); int iswupper(wint_t wc); int iswupper_l(wint_t wc, locale_t locale); int iswxdigit(wint_t wc); int iswxdigit_l(wint_t wc, locale_t locale); DESCRIPTION The functions are character classification utility functions, for use with wide characters (wchar_t or wint_t). See the description of singlebyte classification functions, like isalnum(3), for details. The two-argument variants use the specified locale, while the others use the thread-specific locale set with uselocale(3), falling back to the global locale set with setlocale(3). RETURN VALUES The functions return zero if the character tests false and return non- zero if the character tests true. SEE ALSO isalnum(3), isalpha(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), iswctype(3), isxdigit(3), newlocale(3), setlocale(3), towlower(3) STANDARDS The one-argument functions conform to ISO/IEC 9899:1999 ("ISO C99"), the two-argument functions to IEEE Std 1003.1-2008 ("POSIX.1"). CAVEATS The argument wc must be WEOF or a valid wchar_t value with the current locale; otherwise, the result is undefined. FreeBSD 14.1-RELEASE-p8 September 5, 2017 FreeBSD 14.1-RELEASE-p8