From: Johannes Berg <johannes@sipsolutions.net>
Date: Thu, 25 Mar 2010 06:38:15 +0000 (-0700)
Subject: add hex parser util
X-Git-Tag: v0.9.20~16
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=236d41910e404366663b110a3316eee95a9618f8;p=thirdparty%2Fiw.git

add hex parser util
---

diff --git a/iw.h b/iw.h
index 305604e..d1608e8 100644
--- a/iw.h
+++ b/iw.h
@@ -117,6 +117,7 @@ __u32 __listen_events(struct nl80211_state *state,
 
 int mac_addr_a2n(unsigned char *mac_addr, char *arg);
 void mac_addr_n2a(char *mac_addr, unsigned char *arg);
+unsigned char *parse_hex(char *hex, size_t *outlen);
 
 int parse_keys(struct nl_msg *msg, char **argv, int argc);
 
diff --git a/util.c b/util.c
index 3cb7703..9fc0844 100644
--- a/util.c
+++ b/util.c
@@ -48,6 +48,43 @@ int mac_addr_a2n(unsigned char *mac_addr, char *arg)
 	return 0;
 }
 
+unsigned char *parse_hex(char *hex, size_t *outlen)
+{
+	size_t len = strlen(hex);
+	unsigned char *result = calloc(len/2 + 2, 1);
+	int pos = 0;
+
+	if (!result)
+		return NULL;
+
+	*outlen = 0;
+
+	while (1) {
+		int temp;
+		char *cp = strchr(hex, ':');
+		if (cp) {
+			*cp = 0;
+			cp++;
+		}
+		if (sscanf(hex, "%x", &temp) != 1)
+			goto error;
+		if (temp < 0 || temp > 255)
+			goto error;
+
+		(*outlen)++;
+
+		result[pos++] = temp;
+		if (!cp)
+			break;
+		hex = cp;
+	}
+
+	return result;
+ error:
+	free(result);
+	return NULL;
+}
+
 static const char *ifmodes[NL80211_IFTYPE_MAX + 1] = {
 	"unspecified",
 	"IBSS",