#define UPPERCASE_LETTERS "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#define LETTERS LOWERCASE_LETTERS UPPERCASE_LETTERS
#define ALPHANUMERICAL LETTERS DIGITS
+#define HEXDIGITS DIGITS "abcdefABCDEF"
#define streq(a,b) (strcmp((a),(b)) == 0)
#define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
return !p || !p[0];
}
+static inline const char *empty_to_null(const char *p) {
+ return isempty(p) ? NULL : p;
+}
+
static inline char *startswith(const char *s, const char *prefix) {
size_t l;