From 7ef8a7379f7f7d09e71ccae2a0b688c3cd80423f Mon Sep 17 00:00:00 2001 From: Jakob Kaivo Date: Fri, 8 Feb 2019 18:42:39 -0500 Subject: merge sources into single tree --- src/ctype/isxdigit.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 src/ctype/isxdigit.c (limited to 'src/ctype/isxdigit.c') diff --git a/src/ctype/isxdigit.c b/src/ctype/isxdigit.c new file mode 100644 index 00000000..37857d92 --- /dev/null +++ b/src/ctype/isxdigit.c @@ -0,0 +1,29 @@ +#include +#include "limits.h" +#include "nonstd/assert.h" +#include "nonstd/ctype.h" +#include "nonstd/internal.h" + +/** test whether a character is a hexadecimal digit **/ +int isxdigit(int c) +{ + unsigned int *map = __libc(CTYPE); + + ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF); + /* + RETURN(NONZERO, ARGUMENT(c) is a hexadecimal digit); + RETURN(0, ARGUMENT(c) is not a hexadecimal digit); + */ + return map[c] & XDIGIT; +} + +/*** +tests whether ARGUMENT(c) is a character in the class CHARACTER_CLASS(xdigit) +in the current locale. +***/ + +/* +LC_CTYPE +C_LOCALE(`THIS() is true for the characters CHAR(0), CHAR(1), CHAR(2), CHAR(3), CHAR(4), CHAR(5), CHAR(6), CHAR(7), CHAR(8), CHAR(9), CHAR(a), CHAR(b), CHAR(c), CHAR(d), CHAR(e), CHAR(f), CHAR(A), CHAR(B), CHAR(C), CHAR(D), CHAR(E), and CHAR(F)') +STDC(1) +*/ -- cgit v1.2.1