1 /* 2 * lib/krb5/krb/addr_order.c 3 * 4 * Copyright 1990 by the Massachusetts Institute of Technology. 5 * All Rights Reserved. 6 * 7 * Export of this software from the United States of America may 8 * require a specific license from the United States Government. 9 * It is the responsibility of any person or organization contemplating 10 * export to obtain such a license before exporting. 11 * 12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 13 * distribute this software and its documentation for any purpose and 14 * without fee is hereby granted, provided that the above copyright 15 * notice appear in all copies and that both that copyright notice and 16 * this permission notice appear in supporting documentation, and that 17 * the name of M.I.T. not be used in advertising or publicity pertaining 18 * to distribution of the software without specific, written prior 19 * permission. Furthermore if you modify this software you must label 20 * your software as modified software and not distribute it in such a 21 * fashion that it might be confused with the original M.I.T. software. 22 * M.I.T. makes no representations about the suitability of 23 * this software for any purpose. It is provided "as is" without express 24 * or implied warranty. 25 * 26 * 27 * krb5_address_order() 28 */ 29 30 #include "k5-int.h" 31 32 #ifndef min 33 #define min(a,b) ((a) < (b) ? (a) : (b)) 34 #endif 35 36 /* 37 * Return an ordering on two addresses: 0 if the same, 38 * < 0 if first is less than 2nd, > 0 if first is greater than 2nd. 39 */ 40 /*ARGSUSED*/ 41 int KRB5_CALLCONV 42 krb5_address_order(krb5_context context, const krb5_address *addr1, const krb5_address *addr2) 43 { 44 int dir; 45 register int i; 46 const int minlen = min(addr1->length, addr2->length); 47 48 if (addr1->addrtype != addr2->addrtype) 49 return(FALSE); 50 51 dir = addr1->length - addr2->length; 52 53 54 for (i = 0; i < minlen; i++) { 55 if ((unsigned char) addr1->contents[i] < 56 (unsigned char) addr2->contents[i]) 57 return -1; 58 else if ((unsigned char) addr1->contents[i] > 59 (unsigned char) addr2->contents[i]) 60 return 1; 61 } 62 /* compared equal so far...which is longer? */ 63 return dir; 64 } 65