Inital coommit.

FossilOrigin-Name: f18b93961c5e1823d6e522469a16595c8917a615b066fa09a0d860adac2e4d92

src/capwap/utf8.c

@@ -0,0 +1,36 @@
+#include "capwap.h"
+
+int cw_is_utf8(unsigned char *str, size_t len)
+{
+	size_t i = 0;
+	size_t j = 0;
+	size_t bytes = 0;
+
+	while (i < len) {
+		j = i;
+		if (str[i] < 0x20) {
+			return 0;
+		}
+		if (str[i] <= 0x7F)
+			bytes = 0;
+		else if (str[i] >= 0xC0 /*11000000 */  && str[i] <= 0xDF /*11011111 */ )
+			bytes = 1;
+		else if (str[i] >= 0xE0 /*11100000 */  && str[i] <= 0xEF /*11101111 */ )
+			bytes = 2;
+		else if (str[i] >= 0xF0 /*11110000 */ 
+			 && str[i] <= 0xF4 /* Cause of RFC 3629 */ )
+			bytes = 3;
+		else {
+			return 0;
+		}
+		i += 1;
+		while (i < len && bytes > 0 && str[i] >= 0x80 && str[i] <= 0xBF) {
+			i += 1;
+			bytes -= 1;
+		}
+		if (bytes != 0) {
+			return 0;
+		}
+	}
+	return 1;
+}