stream.c revision c6a36ff1d5769feb95841d934ae85159e23b9def 
1// RUN: %clang_cc1 -analyze -analyzer-check-objc-mem -analyzer-experimental-checks -analyzer-store region -verify %s
2
3typedef __typeof__(sizeof(int)) size_t;
4typedef struct _IO_FILE FILE;
5#define SEEK_SET	0	/* Seek from beginning of file.  */
6#define SEEK_CUR	1	/* Seek from current position.  */
7#define SEEK_END	2	/* Seek from end of file.  */
8extern FILE *fopen(const char *path, const char *mode);
9extern int fclose(FILE *fp);
10extern size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
11extern int fseek (FILE *__stream, long int __off, int __whence);
12extern long int ftell (FILE *__stream);
13extern void rewind (FILE *__stream);
14
15void f1(void) {
16  FILE *p = fopen("foo", "r");
17  char buf[1024];
18  fread(buf, 1, 1, p); // expected-warning {{Stream pointer might be NULL.}}
19}
20
21void f2(void) {
22  FILE *p = fopen("foo", "r");
23  fseek(p, 1, SEEK_SET); // expected-warning {{Stream pointer might be NULL.}}
24}
25
26void f3(void) {
27  FILE *p = fopen("foo", "r");
28  ftell(p); // expected-warning {{Stream pointer might be NULL.}}
29}
30
31void f4(void) {
32  FILE *p = fopen("foo", "r");
33  rewind(p); // expected-warning {{Stream pointer might be NULL.}}
34}
35
36void f5(void) {
37  FILE *p = fopen("foo", "r");
38  if (!p)
39    return;
40  fseek(p, 1, SEEK_SET); // no-warning
41  fseek(p, 1, 3); // expected-warning {{The whence argument to fseek() should be SEEK_SET, SEEK_END, or SEEK_CUR.}}
42}
43
44void f6(void) {
45  FILE *p = fopen("foo", "r");
46  fclose(p);
47  fclose(p); // expected-warning {{Try to close a file Descriptor already closed. Cause undefined behaviour.}}
48}
49