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msg_135.c revision 1.7 
      1 /*	$NetBSD: msg_135.c,v 1.7 2021/04/17 16:58:04 rillig Exp $	*/
      2 # 3 "msg_135.c"
      3 
      4 // Test for message: converting '%s' to '%s' may cause alignment problem [135]
      5 
      6 /* lint1-extra-flags: -h */
      7 
      8 void sink(const void *);
      9 
     10 unsigned
     11 read_uint(const unsigned char **pp)
     12 {
     13 	unsigned val;
     14 
     15 	val = *(const unsigned *)(*pp);	/* expect: 135 */
     16 	pp += sizeof(unsigned);
     17 	return val;
     18 }
     19 
     20 struct incomplete;	/* expect: never defined */
     21 
     22 struct complete {
     23     int member;
     24 };
     25 
     26 /*
     27  * These types of conversions are typically seen in OpenSSL, when converting
     28  * from the publicly visible, incomplete 'struct lhash_st' to a private
     29  * implementation type such as 'struct lhash_st_OPENSSL_STRING'.
     30  *
     31  * Before tree.c 1.277 from 2021-04-17, lint warned about this, even though
     32  * there was not enough evidence that there really was an alignment problem,
     33  * resulting in many false positives.
     34  *
     35  * See openssl/lhash.h.
     36  */
     37 void
     38 pointer_to_structs(struct incomplete *incomplete)
     39 {
     40 	struct complete *complete;
     41 
     42 	complete = (struct complete *)incomplete;
     43 	sink(complete);
     44 }
     45