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ISXDIGIT(3) BSD Library Functions Manual ISXDIGIT(3) NAME isxdigit, ishexnumber -- hexadecimal-digit character test LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <ctype.h> int isxdigit(int c); int ishexnumber(int c); DESCRIPTION The isxdigit() function tests 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() function behaves similarly to isxdigit(), but may rec-ognize recognize ognize additional characters, depending on the current locale setting. For single C chars locales (see multibyte(3)), the value of the argument is representable as an unsigned char or the value of EOF. RETURN VALUES The isxdigit() function returns zero if the character tests false and returns 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() function should be used instead. SEE ALSO ctype(3), isalnum_l(3), iswxdigit(3), multibyte(3), ascii(7) STANDARDS The isxdigit() function conforms to ISO/IEC 9899:1990 (``ISO C90''). HISTORY The ishexnumber() function appeared in 4.4BSD. BSD August 21, 2004 BSD |