Do not use a separate variable for tracking first entry in a list

The pos pointer can be compared to the start of the buffer pointer to
determine whether the entry is the first one in the list. This gets rid
of some static analyzer warnings about unused variable writes.

Signed-off-by: Jouni Malinen <j@w1.fi>

wpa_supplicant/ctrl_iface.c

@@ -2074,7 +2074,8 @@ static char * wpa_supplicant_ie_txt(char *pos, char *end, const char *proto,
 				    const u8 *ie, size_t ie_len)
 {
 	struct wpa_ie_data data;
-	int first, ret;
+	char *start;
+	int ret;
 
 	ret = os_snprintf(pos, end - pos, "[%s-", proto);
 	if (ret < 0 || ret >= end - pos)
@@ -2089,62 +2090,58 @@ static char * wpa_supplicant_ie_txt(char *pos, char *end, const char *proto,
 		return pos;
 	}
 
-	first = 1;
+	start = pos;
 	if (data.key_mgmt & WPA_KEY_MGMT_IEEE8021X) {
-		ret = os_snprintf(pos, end - pos, "%sEAP", first ? "" : "+");
+		ret = os_snprintf(pos, end - pos, "%sEAP",
+				  pos == start ? "" : "+");
 		if (ret < 0 || ret >= end - pos)
 			return pos;
 		pos += ret;
-		first = 0;
 	}
 	if (data.key_mgmt & WPA_KEY_MGMT_PSK) {
-		ret = os_snprintf(pos, end - pos, "%sPSK", first ? "" : "+");
+		ret = os_snprintf(pos, end - pos, "%sPSK",
+				  pos == start ? "" : "+");
 		if (ret < 0 || ret >= end - pos)
 			return pos;
 		pos += ret;
-		first = 0;
 	}
 	if (data.key_mgmt & WPA_KEY_MGMT_WPA_NONE) {
-		ret = os_snprintf(pos, end - pos, "%sNone", first ? "" : "+");
+		ret = os_snprintf(pos, end - pos, "%sNone",
+				  pos == start ? "" : "+");
 		if (ret < 0 || ret >= end - pos)
 			return pos;
 		pos += ret;
-		first = 0;
 	}
 #ifdef CONFIG_IEEE80211R
 	if (data.key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X) {
 		ret = os_snprintf(pos, end - pos, "%sFT/EAP",
-				  first ? "" : "+");
+				  pos == start ? "" : "+");
 		if (ret < 0 || ret >= end - pos)
 			return pos;
 		pos += ret;
-		first = 0;
 	}
 	if (data.key_mgmt & WPA_KEY_MGMT_FT_PSK) {
 		ret = os_snprintf(pos, end - pos, "%sFT/PSK",
-				  first ? "" : "+");
+				  pos == start ? "" : "+");
 		if (ret < 0 || ret >= end - pos)
 			return pos;
 		pos += ret;
-		first = 0;
 	}
 #endif /* CONFIG_IEEE80211R */
 #ifdef CONFIG_IEEE80211W
 	if (data.key_mgmt & WPA_KEY_MGMT_IEEE8021X_SHA256) {
 		ret = os_snprintf(pos, end - pos, "%sEAP-SHA256",
-				  first ? "" : "+");
+				  pos == start ? "" : "+");
 		if (ret < 0 || ret >= end - pos)
 			return pos;
 		pos += ret;
-		first = 0;
 	}
 	if (data.key_mgmt & WPA_KEY_MGMT_PSK_SHA256) {
 		ret = os_snprintf(pos, end - pos, "%sPSK-SHA256",
-				  first ? "" : "+");
+				  pos == start ? "" : "+");
 		if (ret < 0 || ret >= end - pos)
 			return pos;
 		pos += ret;
-		first = 0;
 	}
 #endif /* CONFIG_IEEE80211W */
 
@@ -2862,7 +2859,7 @@ static int ctrl_iface_get_capability_pairwise(int res, char *strict,
 					      struct wpa_driver_capa *capa,
 					      char *buf, size_t buflen)
 {
-	int ret, first = 1;
+	int ret;
 	char *pos, *end;
 	size_t len;
 	unsigned int i;
@@ -2882,11 +2879,11 @@ static int ctrl_iface_get_capability_pairwise(int res, char *strict,
 	for (i = 0; i < ARRAY_SIZE(ciphers); i++) {
 		if (!ciphers[i].group_only && capa->enc & ciphers[i].capa) {
 			ret = os_snprintf(pos, end - pos, "%s%s",
-					  first ? "" : " ", ciphers[i].name);
+					  pos == buf ? "" : " ",
+					  ciphers[i].name);
 			if (ret < 0 || ret >= end - pos)
 				return pos - buf;
 			pos += ret;
-			first = 0;
 		}
 	}
 
@@ -2898,7 +2895,7 @@ static int ctrl_iface_get_capability_group(int res, char *strict,
 					   struct wpa_driver_capa *capa,
 					   char *buf, size_t buflen)
 {
-	int ret, first = 1;
+	int ret;
 	char *pos, *end;
 	size_t len;
 	unsigned int i;
@@ -2918,11 +2915,11 @@ static int ctrl_iface_get_capability_group(int res, char *strict,
 	for (i = 0; i < ARRAY_SIZE(ciphers); i++) {
 		if (capa->enc & ciphers[i].capa) {
 			ret = os_snprintf(pos, end - pos, "%s%s",
-					  first ? "" : " ", ciphers[i].name);
+					  pos == buf ? "" : " ",
+					  ciphers[i].name);
 			if (ret < 0 || ret >= end - pos)
 				return pos - buf;
 			pos += ret;
-			first = 0;
 		}
 	}
 
@@ -2987,7 +2984,7 @@ static int ctrl_iface_get_capability_proto(int res, char *strict,
 					   struct wpa_driver_capa *capa,
 					   char *buf, size_t buflen)
 {
-	int ret, first = 1;
+	int ret;
 	char *pos, *end;
 	size_t len;
 
@@ -3005,20 +3002,20 @@ static int ctrl_iface_get_capability_proto(int res, char *strict,
 
 	if (capa->key_mgmt & (WPA_DRIVER_CAPA_KEY_MGMT_WPA2 |
 			      WPA_DRIVER_CAPA_KEY_MGMT_WPA2_PSK)) {
-		ret = os_snprintf(pos, end - pos, "%sRSN", first ? "" : " ");
+		ret = os_snprintf(pos, end - pos, "%sRSN",
+				  pos == buf ? "" : " ");
 		if (ret < 0 || ret >= end - pos)
 			return pos - buf;
 		pos += ret;
-		first = 0;
 	}
 
 	if (capa->key_mgmt & (WPA_DRIVER_CAPA_KEY_MGMT_WPA |
 			      WPA_DRIVER_CAPA_KEY_MGMT_WPA_PSK)) {
-		ret = os_snprintf(pos, end - pos, "%sWPA", first ? "" : " ");
+		ret = os_snprintf(pos, end - pos, "%sWPA",
+				  pos == buf ? "" : " ");
 		if (ret < 0 || ret >= end - pos)
 			return pos - buf;
 		pos += ret;
-		first = 0;
 	}
 
 	return pos - buf;
@@ -3029,7 +3026,7 @@ static int ctrl_iface_get_capability_auth_alg(int res, char *strict,
 					      struct wpa_driver_capa *capa,
 					      char *buf, size_t buflen)
 {
-	int ret, first = 1;
+	int ret;
 	char *pos, *end;
 	size_t len;
 
@@ -3046,28 +3043,27 @@ static int ctrl_iface_get_capability_auth_alg(int res, char *strict,
 	}
 
 	if (capa->auth & (WPA_DRIVER_AUTH_OPEN)) {
-		ret = os_snprintf(pos, end - pos, "%sOPEN", first ? "" : " ");
+		ret = os_snprintf(pos, end - pos, "%sOPEN",
+				  pos == buf ? "" : " ");
 		if (ret < 0 || ret >= end - pos)
 			return pos - buf;
 		pos += ret;
-		first = 0;
 	}
 
 	if (capa->auth & (WPA_DRIVER_AUTH_SHARED)) {
 		ret = os_snprintf(pos, end - pos, "%sSHARED",
-				  first ? "" : " ");
+				  pos == buf ? "" : " ");
 		if (ret < 0 || ret >= end - pos)
 			return pos - buf;
 		pos += ret;
-		first = 0;
 	}
 
 	if (capa->auth & (WPA_DRIVER_AUTH_LEAP)) {
-		ret = os_snprintf(pos, end - pos, "%sLEAP", first ? "" : " ");
+		ret = os_snprintf(pos, end - pos, "%sLEAP",
+				  pos == buf ? "" : " ");
 		if (ret < 0 || ret >= end - pos)
 			return pos - buf;
 		pos += ret;
-		first = 0;
 	}
 
 	return pos - buf;
@@ -3078,7 +3074,7 @@ static int ctrl_iface_get_capability_modes(int res, char *strict,
 					   struct wpa_driver_capa *capa,
 					   char *buf, size_t buflen)
 {
-	int ret, first = 1;
+	int ret;
 	char *pos, *end;
 	size_t len;
 
@@ -3095,19 +3091,19 @@ static int ctrl_iface_get_capability_modes(int res, char *strict,
 	}
 
 	if (capa->flags & WPA_DRIVER_FLAGS_IBSS) {
-		ret = os_snprintf(pos, end - pos, "%sIBSS", first ? "" : " ");
+		ret = os_snprintf(pos, end - pos, "%sIBSS",
+				  pos == buf ? "" : " ");
 		if (ret < 0 || ret >= end - pos)
 			return pos - buf;
 		pos += ret;
-		first = 0;
 	}
 
 	if (capa->flags & WPA_DRIVER_FLAGS_AP) {
-		ret = os_snprintf(pos, end - pos, "%sAP", first ? "" : " ");
+		ret = os_snprintf(pos, end - pos, "%sAP",
+				  pos == buf ? "" : " ");
 		if (ret < 0 || ret >= end - pos)
 			return pos - buf;
 		pos += ret;
-		first = 0;
 	}
 
 	return pos - buf;