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msg_135.c revision 1.10 
      1 /*	$NetBSD: msg_135.c,v 1.10 2022/06/11 11:52:13 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 short **pp)
     12 {
     13 	unsigned val;
     14 
     15 	/* expect+1: warning: converting 'pointer to const unsigned short' to 'pointer to const unsigned int' may cause alignment problem [135] */
     16 	val = *(const unsigned *)(*pp);
     17 	pp += sizeof(unsigned);
     18 	return val;
     19 }
     20 
     21 /* expect+1: warning: struct 'incomplete' never defined [233] */
     22 struct incomplete;
     23 
     24 struct complete {
     25     int member;
     26 };
     27 
     28 /*
     29  * These types of conversions are typically seen in OpenSSL, when converting
     30  * from the publicly visible, incomplete 'struct lhash_st' to a private
     31  * implementation type such as 'struct lhash_st_OPENSSL_STRING'.
     32  *
     33  * Before tree.c 1.277 from 2021-04-17, lint warned about this, even though
     34  * there was not enough evidence that there really was an alignment problem,
     35  * resulting in many false positives.
     36  *
     37  * See openssl/lhash.h.
     38  */
     39 void
     40 pointer_to_structs(struct incomplete *incomplete)
     41 {
     42 	struct complete *complete;
     43 
     44 	complete = (struct complete *)incomplete;
     45 	sink(complete);
     46 }
     47 
     48 /*
     49  * Before tree.c 1.316 from 2021-07-15, lint warned about pointer casts from
     50  * unsigned char or plain char to another type.  These casts often occur in
     51  * traditional code that does not use void pointers, even 30 years after C90
     52  * introduced 'void'.
     53  */
     54 void
     55 unsigned_char_to_unsigned_type(unsigned char *ucp)
     56 {
     57 	unsigned short *usp;
     58 
     59 	usp = (unsigned short *)ucp;
     60 	sink(usp);
     61 }
     62 
     63 /*
     64  * Before tree.c 1.316 from 2021-07-15, lint warned about pointer casts from
     65  * unsigned char or plain char to another type.  These casts often occur in
     66  * traditional code that does not use void pointers, even 30 years after C90
     67  * introduced 'void'.
     68  */
     69 void
     70 plain_char_to_unsigned_type(char *cp)
     71 {
     72 	unsigned short *usp;
     73 
     74 	usp = (unsigned short *)cp;
     75 	sink(usp);
     76 }
     77