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msg_346.c revision 1.6 
      1 /*	$NetBSD: msg_346.c,v 1.6 2021/10/09 20:03:20 rillig Exp $	*/
      2 # 3 "msg_346.c"
      3 
      4 // Test for message: call to '%s' effectively discards 'const' from argument [346]
      5 
      6 typedef unsigned long size_t;
      7 
      8 void* memchr(const void *, int, size_t);		/* C99 7.21.5.1 */
      9 char *strchr(const char *, int);			/* C99 7.21.5.2 */
     10 char* strpbrk(const char *, const char *);		/* C99 7.21.5.4 */
     11 char* strrchr(const char *, int);			/* C99 7.21.5.5 */
     12 char* strstr(const char *, const char *);		/* C99 7.21.5.7 */
     13 
     14 void take_const_char_ptr(const char *);
     15 void take_char_ptr(char *);
     16 
     17 void
     18 example(void)
     19 {
     20 	const char *ccp = "const char *";
     21 	char *cp = "char *";
     22 
     23 	ccp = strchr(ccp, 'c');
     24 	ccp = strchr(cp, 'c');
     25 	/* expect+1: warning: call to 'strchr' effectively discards 'const' from argument [346] */
     26 	cp = strchr(ccp, 'c');
     27 	cp = strchr(cp, 'c');
     28 
     29 	take_const_char_ptr(strchr(ccp, 'c'));
     30 	take_const_char_ptr(strchr(cp, 'c'));
     31 	/* expect+1: warning: call to 'strchr' effectively discards 'const' from argument [346] */
     32 	take_char_ptr(strchr(ccp, 'c'));
     33 	take_char_ptr(strchr(cp, 'c'));
     34 
     35 	take_const_char_ptr(strchr("literal", 'c'));
     36 	/* expect+1: warning: call to 'strchr' effectively discards 'const' from argument [346] */
     37 	take_char_ptr(strchr("literal", 'c'));
     38 }
     39 
     40 void
     41 all_functions(void)
     42 {
     43 	/* expect+1: warning: call to 'memchr' effectively discards 'const' from argument [346] */
     44 	take_char_ptr(memchr("string", 'c', 7));
     45 	/* expect+1: warning: call to 'strchr' effectively discards 'const' from argument [346] */
     46 	take_char_ptr(strchr("string", 'c'));
     47 	/* expect+1: warning: call to 'strpbrk' effectively discards 'const' from argument [346] */
     48 	take_char_ptr(strpbrk("string", "c"));
     49 	/* expect+1: warning: call to 'strrchr' effectively discards 'const' from argument [346] */
     50 	take_char_ptr(strrchr("string", 'c'));
     51 	/* expect+1: warning: call to 'strstr' effectively discards 'const' from argument [346] */
     52 	take_char_ptr(strstr("string", "c"));
     53 }
     54 
     55 void
     56 edge_cases(void)
     57 {
     58 	/* No arguments, to cover the 'an == NULL' in is_first_arg_const. */
     59 	/* expect+1: error: argument mismatch: 0 arg passed, 2 expected [150] */
     60 	take_char_ptr(strchr());
     61 }
     62 
     63 /*
     64  * Bsearch is another standard function that effectively discards the 'const'
     65  * modifier, but from the second argument, not the first.
     66  */
     67 
     68 void *bsearch(const void *key, const void *base, size_t nmemb, size_t size,
     69 	int (*compar) (const void *, const void *));
     70 
     71 int cmp(const void *, const void *);
     72 
     73 void take_void_ptr(void *);
     74 void take_const_void_ptr(const void *);
     75 
     76 void
     77 bsearch_example(void)
     78 {
     79 	int arr[] = { 1 };
     80 	const int const_arr[] = { 1 };
     81 
     82 	take_const_void_ptr(bsearch("", const_arr, 4, 1, cmp));
     83 	take_const_void_ptr(bsearch("", arr, 4, 1, cmp));
     84 	take_void_ptr(bsearch("", arr, 4, 1, cmp));
     85 
     86 	/* expect+1: warning: call to 'bsearch' effectively discards 'const' from argument [346] */
     87 	take_void_ptr(bsearch("", const_arr, 4, 1, cmp));
     88 }
     89