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ISXDIGIT(3) FreeBSD Library Functions Manual ISXDIGIT(3) NAME isxdigit, ishexnumber, isxdigit_l, ishexnumber_l - hexadecimal-digit character test LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <ctype.h> int isxdigit(int c); int ishexnumber(int c); int isxdigit_l(int c, locale_t loc); int ishexnumber_l(int c, locale_t loc); DESCRIPTION The isxdigit() and isxdigit_l() functions test for any hexadecimal-digit character. Regardless of locale, this includes the following characters only: ``0'' ``1'' ``2'' ``3'' ``4'' ``5'' ``6'' ``7'' ``8'' ``9'' ``A'' ``B'' ``C'' ``D'' ``E'' ``F'' ``a'' ``b'' ``c'' ``d'' ``e'' ``f'' The ishexnumber() and ishexnumber_l() functions behave similarly to isxdigit() and isxdigit_l(), but may recognize additional characters, depending on the current locale setting. The value of the argument must be representable as an unsigned char or the value of EOF. The _l-suffixed versions take an explicit locale argument, whereas the non-suffixed versions use the current global or per-thread locale. RETURN VALUES The isxdigit() and isxdigit_l() functions return zero if the character tests false and return non-zero if the character tests true. COMPATIBILITY The 4.4BSD extension of accepting arguments outside of the range of the unsigned char type in locales with large character sets is considered obsolete and may not be supported in future releases. The iswxdigit() or iswxdigit_l() function should be used instead. SEE ALSO ctype(3), ctype_l(3), iswxdigit(3), iswxdigit_l(3), xlocale(3), ascii(7) STANDARDS The isxdigit() function conforms to ISO/IEC 9899:1990 ("ISO C90"). HISTORY The ishexnumber() function appeared in 4.4BSD. FreeBSD 14.1-RELEASE-p8 December 19, 2022 FreeBSD 14.1-RELEASE-p8