1 // RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.unix.Stream -analyzer-output text -verify %s
2
3 #include "Inputs/system-header-simulator.h"
4
check_note_at_correct_open(void)5 void check_note_at_correct_open(void) {
6 FILE *F1 = tmpfile(); // expected-note {{Stream opened here}}
7 if (!F1)
8 // expected-note@-1 {{'F1' is non-null}}
9 // expected-note@-2 {{Taking false branch}}
10 return;
11 FILE *F2 = tmpfile();
12 if (!F2) {
13 // expected-note@-1 {{'F2' is non-null}}
14 // expected-note@-2 {{Taking false branch}}
15 fclose(F1);
16 return;
17 }
18 rewind(F2);
19 fclose(F2);
20 rewind(F1);
21 }
22 // expected-warning@-1 {{Opened stream never closed. Potential resource leak}}
23 // expected-note@-2 {{Opened stream never closed. Potential resource leak}}
24
check_note_fopen(void)25 void check_note_fopen(void) {
26 FILE *F = fopen("file", "r"); // expected-note {{Stream opened here}}
27 if (!F)
28 // expected-note@-1 {{'F' is non-null}}
29 // expected-note@-2 {{Taking false branch}}
30 return;
31 }
32 // expected-warning@-1 {{Opened stream never closed. Potential resource leak}}
33 // expected-note@-2 {{Opened stream never closed. Potential resource leak}}
34
check_note_freopen(void)35 void check_note_freopen(void) {
36 FILE *F = fopen("file", "r"); // expected-note {{Stream opened here}}
37 if (!F)
38 // expected-note@-1 {{'F' is non-null}}
39 // expected-note@-2 {{Taking false branch}}
40 return;
41 F = freopen(0, "w", F); // expected-note {{Stream reopened here}}
42 if (!F)
43 // expected-note@-1 {{'F' is non-null}}
44 // expected-note@-2 {{Taking false branch}}
45 return;
46 }
47 // expected-warning@-1 {{Opened stream never closed. Potential resource leak}}
48 // expected-note@-2 {{Opened stream never closed. Potential resource leak}}
49
check_note_leak_2(int c)50 void check_note_leak_2(int c) {
51 FILE *F1 = fopen("foo1.c", "r"); // expected-note {{Stream opened here}}
52 if (!F1)
53 // expected-note@-1 {{'F1' is non-null}}
54 // expected-note@-2 {{Taking false branch}}
55 // expected-note@-3 {{'F1' is non-null}}
56 // expected-note@-4 {{Taking false branch}}
57 return;
58 FILE *F2 = fopen("foo2.c", "r"); // expected-note {{Stream opened here}}
59 if (!F2) {
60 // expected-note@-1 {{'F2' is non-null}}
61 // expected-note@-2 {{Taking false branch}}
62 // expected-note@-3 {{'F2' is non-null}}
63 // expected-note@-4 {{Taking false branch}}
64 fclose(F1);
65 return;
66 }
67 if (c)
68 // expected-note@-1 {{Assuming 'c' is not equal to 0}}
69 // expected-note@-2 {{Taking true branch}}
70 // expected-note@-3 {{Assuming 'c' is not equal to 0}}
71 // expected-note@-4 {{Taking true branch}}
72 return;
73 // expected-warning@-1 {{Opened stream never closed. Potential resource leak}}
74 // expected-note@-2 {{Opened stream never closed. Potential resource leak}}
75 // expected-warning@-3 {{Opened stream never closed. Potential resource leak}}
76 // expected-note@-4 {{Opened stream never closed. Potential resource leak}}
77 fclose(F1);
78 fclose(F2);
79 }
80
check_track_null(void)81 void check_track_null(void) {
82 FILE *F;
83 F = fopen("foo1.c", "r"); // expected-note {{Value assigned to 'F'}} expected-note {{Assuming pointer value is null}}
84 if (F != NULL) { // expected-note {{Taking false branch}} expected-note {{'F' is equal to NULL}}
85 fclose(F);
86 return;
87 }
88 fclose(F); // expected-warning {{Stream pointer might be NULL}}
89 // expected-note@-1 {{Stream pointer might be NULL}}
90 }
91
check_eof_notes_feof_after_feof(void)92 void check_eof_notes_feof_after_feof(void) {
93 FILE *F;
94 char Buf[10];
95 F = fopen("foo1.c", "r");
96 if (F == NULL) { // expected-note {{Taking false branch}} expected-note {{'F' is not equal to NULL}}
97 return;
98 }
99 fread(Buf, 1, 1, F);
100 if (feof(F)) { // expected-note {{Taking true branch}}
101 clearerr(F);
102 fread(Buf, 1, 1, F); // expected-note {{Assuming stream reaches end-of-file here}}
103 if (feof(F)) { // expected-note {{Taking true branch}}
104 fread(Buf, 1, 1, F); // expected-warning {{Read function called when stream is in EOF state. Function has no effect}}
105 // expected-note@-1 {{Read function called when stream is in EOF state. Function has no effect}}
106 }
107 }
108 fclose(F);
109 }
110
check_eof_notes_feof_after_no_feof(void)111 void check_eof_notes_feof_after_no_feof(void) {
112 FILE *F;
113 char Buf[10];
114 F = fopen("foo1.c", "r");
115 if (F == NULL) { // expected-note {{Taking false branch}} expected-note {{'F' is not equal to NULL}}
116 return;
117 }
118 fread(Buf, 1, 1, F);
119 if (feof(F)) { // expected-note {{Taking false branch}}
120 fclose(F);
121 return;
122 } else if (ferror(F)) { // expected-note {{Taking false branch}}
123 fclose(F);
124 return;
125 }
126 fread(Buf, 1, 1, F); // expected-note {{Assuming stream reaches end-of-file here}}
127 if (feof(F)) { // expected-note {{Taking true branch}}
128 fread(Buf, 1, 1, F); // expected-warning {{Read function called when stream is in EOF state. Function has no effect}}
129 // expected-note@-1 {{Read function called when stream is in EOF state. Function has no effect}}
130 }
131 fclose(F);
132 }
133
check_eof_notes_feof_or_no_error(void)134 void check_eof_notes_feof_or_no_error(void) {
135 FILE *F;
136 char Buf[10];
137 F = fopen("foo1.c", "r");
138 if (F == NULL) // expected-note {{Taking false branch}} expected-note {{'F' is not equal to NULL}}
139 return;
140 int RRet = fread(Buf, 1, 1, F); // expected-note {{Assuming stream reaches end-of-file here}}
141 if (ferror(F)) { // expected-note {{Taking false branch}}
142 } else {
143 fread(Buf, 1, 1, F); // expected-warning {{Read function called when stream is in EOF state. Function has no effect}}
144 // expected-note@-1 {{Read function called when stream is in EOF state. Function has no effect}}
145 }
146 fclose(F);
147 }
148