1 /* $NetBSD: msg_135.c,v 1.11 2022/07/16 22:36:06 rillig Exp $ */ 2 # 3 "msg_135.c" 3 4 // Test for message: converting '%s' to '%s' increases alignment from %u to %u [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' increases alignment from 2 to 4 [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