1 files changed, 16 insertions, 0 deletions

diff --git a/src/util/str.c b/src/util/str.c
index 933eb83..3f9f39c 100644
--- a/src/util/str.c
+++ b/src/util/str.c
@@ -3,9 +3,25 @@
  * Copyright (C) 2017 J08nY
  */
 #include "str.h"
+#include <ctype.h>
 #include <string.h>
 #include "util/memory.h"
 
+const char *str_is_hex(const char *hex_str) {
+	const char *str_start = hex_str;
+	if (strlen(hex_str) > 2) {
+		if (hex_str[0] == '0' && (hex_str[1] == 'x' || hex_str[1] == 'X')) {
+			str_start = hex_str + 2;
+		}
+	}
+	const char *s = str_start;
+	while (*s != 0) {
+		char c = *s++;
+		if (!isxdigit(c)) return NULL;
+	}
+	return str_start;
+}
+
 char *str_join(char *strings[], size_t len) {
 	size_t total = 0;
 	for (size_t i = 0; i < len; ++i) {