format-strings.c revision d0d082f2eba4e3ed4eb467d76fd227c6dcd6cce7 
1// RUN: clang -fsyntax-only -verify %s
2
3// Define this to get vasprintf on Linux
4#define _GNU_SOURCE
5
6#include <stdio.h>
7#include <stdarg.h>
8
9char * global_fmt;
10
11void check_string_literal( FILE* fp, const char* s, char *buf, ... ) {
12
13  char * b;
14  va_list ap;
15  va_start(ap,buf);
16
17  printf(s); // expected-warning {{format string is not a string literal}}
18  vprintf(s,ap); // // no-warning
19  fprintf(fp,s); // expected-warning {{format string is not a string literal}}
20  vfprintf(fp,s,ap); // no-warning
21  asprintf(&b,s); // expected-warning {{format string is not a string lit}}
22  vasprintf(&b,s,ap); // no-warning
23  sprintf(buf,s); // expected-warning {{format string is not a string literal}}
24  snprintf(buf,2,s); // expected-warning {{format string is not a string lit}}
25  __builtin___sprintf_chk(buf,0,-1,s); // expected-warning {{format string is not a string literal}}
26  __builtin___snprintf_chk(buf,2,0,-1,s); // expected-warning {{format string is not a string lit}}
27  vsprintf(buf,s,ap); // no-warning
28  vsnprintf(buf,2,s,ap); // no-warning
29  vsnprintf(buf,2,global_fmt,ap); // expected-warning {{format string is not a string literal}}
30  __builtin___vsnprintf_chk(buf,2,0,-1,s,ap); // no-warning
31  __builtin___vsnprintf_chk(buf,2,0,-1,global_fmt,ap); // expected-warning {{format string is not a string literal}}
32
33  // rdar://6079877
34  printf("abc"
35         "%*d", (unsigned) 1, 1); // expected-warning {{field width should have type 'int'}}
36  printf("abc\
37def"
38         "%*d", (unsigned) 1, 1); // expected-warning {{field width should have type 'int'}}
39
40}
41
42void check_conditional_literal(const char* s, int i) {
43  printf(i == 1 ? "yes" : "no"); // no-warning
44  printf(i == 0 ? (i == 1 ? "yes" : "no") : "dont know"); // no-warning
45  printf(i == 0 ? (i == 1 ? s : "no") : "dont know"); // expected-warning{{format string is not a string literal}}
46}
47
48void check_writeback_specifier()
49{
50  int x;
51  char *b;
52
53  printf("%n",&x); // expected-warning {{'%n' in format string discouraged}}
54  sprintf(b,"%d%%%n",1, &x); // expected-warning {{'%n' in format string dis}}
55}
56
57void check_invalid_specifier(FILE* fp, char *buf)
58{
59  printf("%s%lb%d","unix",10,20); // expected-warning {{lid conversion '%lb'}}
60  fprintf(fp,"%%%l"); // expected-warning {{lid conversion '%l'}}
61  sprintf(buf,"%%%%%ld%d%d", 1, 2, 3); // no-warning
62  snprintf(buf, 2, "%%%%%ld%;%d", 1, 2, 3); // expected-warning {{sion '%;'}}
63}
64
65void check_null_char_string(char* b)
66{
67  printf("\0this is bogus%d",1); // expected-warning {{string contains '\0'}}
68  snprintf(b,10,"%%%%%d\0%d",1,2); // expected-warning {{string contains '\0'}}
69  printf("%\0d",1); // expected-warning {{string contains '\0'}}
70}
71
72void check_empty_format_string(char* buf, ...)
73{
74  va_list ap;
75  va_start(ap,buf);
76  vprintf("",ap); // expected-warning {{format string is empty}}
77  sprintf(buf,""); // expected-warning {{format string is empty}}
78}
79
80void check_wide_string(char* b, ...)
81{
82  va_list ap;
83  va_start(ap,b);
84
85  printf(L"foo %d",2); // expected-warning {{incompatible pointer types}}, expected-warning {{should not be a wide string}}
86  vasprintf(&b,L"bar %d",ap); // expected-warning {{incompatible pointer types}}, expected-warning {{should not be a wide string}}
87}
88
89void check_asterisk_precision_width(int x) {
90  printf("%*d"); // expected-warning {{'*' specified field width is missing a matching 'int' argument}}
91  printf("%.*d"); // expected-warning {{'.*' specified field precision is missing a matching 'int' argument}}
92  printf("%*d",12,x); // no-warning
93  printf("%*d","foo",x); // expected-warning {{field width should have type 'int', but argument has type 'char *'}}
94  printf("%.*d","foo",x); // expected-warning {{field precision should have type 'int', but argument has type 'char *'}}
95}
96
97void __attribute__((format(printf,1,3))) myprintf(const char*, int blah, ...);
98
99void test_myprintf() {
100  myprintf("%d", 17, 18); // okay
101}
102