Random alpha-numeric username (6 characters)

wrenchboard/src/include/common_tool.h

@@ -11,6 +11,7 @@ void GetOfferCode( unsigned long  offer_id, char * number, int sz );
 void Confirmation( unsigned long  payment_id, char * number, int sz );
 void SetFamilyUsername( unsigned long  family_id, char * number, int sz );
 long WrenchLogRecent(CVars in, CVars &out);
+void RandomAlphaNumeric( char * number, int sz, int seed );
 
 #endif
 

wrenchboard/src/shared_tool/common_tool.cc

@@ -45,6 +45,32 @@ void GenerateConfirmationSeed( char * number, int sz, int seed )
         number[i] = 0;
 }
 
+void RandomAlphaNumeric( char * number, int sz, int seed )
+{
+        char chars[] = "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+        int n = sizeof(chars);
+        int i;
+/*
+        time_t t;
+        time( &t );
+        pid_t pid = getpid();
+
+        srand(t+pid);
+*/
+	srand((unsigned int)time((time_t *)NULL));
+
+        for ( i=0; i<10 && i<sz-1; i++ )
+        {
+		int k = seed%n;
+		if (seed>1 && k==i) {
+			number[i] = chars[n-k];
+		} else {
+                	number[i] = chars[ (int) ( (n-1.0)*rand()/(RAND_MAX+1.0)) ];
+		}
+        }
+        number[i] = 0;
+}
+
 
 
 void Confirmation( unsigned long  payment_id, char * number, int sz )
@@ -104,14 +130,16 @@ void GetOfferCode( unsigned long  offer_id, char * number, int sz )
 void SetFamilyUsername( unsigned long  family_id, char * number, int sz )
 {
 	SQLINTEGER rows;
-	char family_username[14];
+	char family_username[7]; // 6 characters + \0
+  bzero(family_username, sizeof(family_username));
 
    // Lock table to prevent generation of two identical username
 	pgsql_exec("BEGIN; LOCK TABLE members_family;" );
 	int i = 0;
 	do
 	{
-		GenerateConfirmationSeed( family_username, sizeof(family_username), i++ );
+		//GenerateConfirmationSeed( family_username, sizeof(family_username), i++ );
+    RandomAlphaNumeric( family_username, sizeof(family_username), i++ );
 
         	//st.CloseCursor();
 			rows = 0;