DragonFly On-Line Manual Pages

ISXDIGIT(3)	      DragonFly Library Functions Manual	   ISXDIGIT(3)


isxdigit, isxdigit_l, ishexnumber, ishexnumber_l -- hexadecimal-digit character test


Standard C Library (libc, -lc)


#include <ctype.h> int isxdigit(int c); int isxdigit_l(int c, locale_t locale); #include <xlocale.h> int ishexnumber(int c); int ishexnumber_l(int c, locale_t locale);


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.


The isxdigit(), isxdigit_l(), ishexnumber(), and ishexnumber_l() func- tions return zero if the character tests false and returns non-zero if the character tests true.


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(), iswxdigit_l(), iswhexnumber(), and iswhexnumber_l() functions should be used instead.


ctype(3), ctype_l(3), iswxdigit(3), iswxdigit_l(3), xlocale(3), ascii(7)


The isxdigit() function conforms to ISO/IEC 9899:1990 (``ISO C90''). The isxdigit_l() function conforms to IEEE Std 1003.1-2008 (``POSIX.1'').


The ishexnumber() function appeared in 4.4BSD. DragonFly 4.3 December 25, 2013 DragonFly 4.3