92    number of characters from a set of character classes.
94    If there are n classes, and the size of each class is Pi, and the
96    passwords are (given that the character classes are disjoint):
118     } *classes;  in generate_password()  local
126     classes = malloc(num_classes * sizeof(*classes));  in generate_password()
127     if(classes == NULL)  in generate_password()
132 	classes[i].str = va_arg(ap, const char*);  in generate_password()
133 	classes[i].len = strlen(classes[i].str);  in generate_password()
134 	classes[i].freq = va_arg(ap, int);  in generate_password()
135 	len += classes[i].freq;  in generate_password()
140 	free(classes);  in generate_password()
148 	    if(x < t + classes[j].freq) {  in generate_password()
149 		(*pw)[i] = classes[j].str[RND(rbuf, sizeof(rbuf), &rleft)  in generate_password()
150 					 % classes[j].len];  in generate_password()
151 		classes[j].freq--;  in generate_password()
154 	    t += classes[j].freq;  in generate_password()
159     free(classes);  in generate_password()