Add vct_isdigit()

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4670 d4fa192b-c00b-0410-8231-f00ffab90ce4

include/vct.h

@@ -55,6 +55,7 @@ vct_is(unsigned char x, uint16_t y)
 #define vct_iscrlf(x) vct_is(x, VCT_CRLF)
 #define vct_islws(x) vct_is(x, VCT_LWS)
 #define vct_isctl(x) vct_is(x, VCT_CTL)
+#define vct_isdigit(x) vct_is(x, VCT_DIGIT)
 #define vct_isalpha(x) vct_is(x, VCT_ALPHA)
 #define vct_issep(x) vct_is(x, VCT_SEPARATOR)
 #define vct_issepctl(x) vct_is(x, VCT_SEPARATOR | VCT_CTL)