// RUN: %clang_analyze_cc1 -analyzer-checker=core,unix.Stream -analyzer-output text \
// RUN: -analyzer-config unix.Stream:Pedantic=true \
// RUN: -verify %s
// RUN: %clang_analyze_cc1 -analyzer-checker=core,unix.Stream,unix.StdCLibraryFunctions -analyzer-output text \
// RUN: -analyzer-config unix.Stream:Pedantic=true \
// RUN: -analyzer-config unix.StdCLibraryFunctions:ModelPOSIX=true -verify=expected,stdargs %s
#include "Inputs/system-header-simulator.h"
void check_note_at_correct_open(void) {
FILE *F1 = tmpfile(); // expected-note {{Stream opened here}}
// stdargs-note@-1 {{'tmpfile' is successful}}
if (!F1)
// expected-note@-1 {{'F1' is non-null}}
// expected-note@-2 {{Taking false branch}}
return;
FILE *F2 = tmpfile();
if (!F2) {
// expected-note@-1 {{'F2' is non-null}}
// expected-note@-2 {{Taking false branch}}
fclose(F1);
return;
}
rewind(F2);
fclose(F2);
rewind(F1);
}
// expected-warning@-1 {{Opened stream never closed. Potential resource leak}}
// expected-note@-2 {{Opened stream never closed. Potential resource leak}}
void check_note_fopen(void) {
FILE *F = fopen("file", "r"); // expected-note {{Stream opened here}}
// stdargs-note@-1 {{'fopen' is successful}}
if (!F)
// expected-note@-1 {{'F' is non-null}}
// expected-note@-2 {{Taking false branch}}
return;
}
// expected-warning@-1 {{Opened stream never closed. Potential resource leak}}
// expected-note@-2 {{Opened stream never closed. Potential resource leak}}
void check_note_freopen(void) {
FILE *F = fopen("file", "r"); // expected-note {{Stream opened here}}
// stdargs-note@-1 {{'fopen' is successful}}
if (!F)
// expected-note@-1 {{'F' is non-null}}
// expected-note@-2 {{Taking false branch}}
return;
F = freopen(0, "w", F); // expected-note {{Stream reopened here}}
// stdargs-note@-1 {{'freopen' is successful}}
if (!F)
// expected-note@-1 {{'F' is non-null}}
// expected-note@-2 {{Taking false branch}}
return;
}
// expected-warning@-1 {{Opened stream never closed. Potential resource leak}}
// expected-note@-2 {{Opened stream never closed. Potential resource leak}}
void check_note_fdopen(int fd) {
FILE *F = fdopen(fd, "r"); // expected-note {{Stream opened here}}
// stdargs-note@-1 {{'fdopen' is successful}}
if (!F)
// expected-note@-1 {{'F' is non-null}}
// expected-note@-2 {{Taking false branch}}
return;
}
// expected-warning@-1 {{Opened stream never closed. Potential resource leak}}
// expected-note@-2 {{Opened stream never closed. Potential resource leak}}
void check_note_leak_2(int c) {
FILE *F1 = fopen("foo1.c", "r"); // expected-note {{Stream opened here}}
// stdargs-note@-1 {{'fopen' is successful}}
if (!F1)
// expected-note@-1 {{'F1' is non-null}}
// expected-note@-2 {{Taking false branch}}
// expected-note@-3 {{'F1' is non-null}}
// expected-note@-4 {{Taking false branch}}
return;
FILE *F2 = fopen("foo2.c", "r"); // expected-note {{Stream opened here}}
// stdargs-note@-1 {{'fopen' is successful}}
if (!F2) {
// expected-note@-1 {{'F2' is non-null}}
// expected-note@-2 {{Taking false branch}}
// expected-note@-3 {{'F2' is non-null}}
// expected-note@-4 {{Taking false branch}}
fclose(F1);
return;
}
if (c)
// expected-note@-1 {{Assuming 'c' is not equal to 0}}
// expected-note@-2 {{Taking true branch}}
// expected-note@-3 {{Assuming 'c' is not equal to 0}}
// expected-note@-4 {{Taking true branch}}
return;
// expected-warning@-1 {{Opened stream never closed. Potential resource leak}}
// expected-note@-2 {{Opened stream never closed. Potential resource leak}}
// expected-warning@-3 {{Opened stream never closed. Potential resource leak}}
// expected-note@-4 {{Opened stream never closed. Potential resource leak}}
fclose(F1);
fclose(F2);
}
void check_track_null(void) {
FILE *F;
F = fopen("foo1.c", "r"); // expected-note {{Value assigned to 'F'}} expected-note {{Assuming pointer value is null}}
// stdargs-note@-1 {{'fopen' fails}}
if (F != NULL) { // expected-note {{Taking false branch}} expected-note {{'F' is equal to NULL}}
fclose(F);
return;
}
fclose(F); // expected-warning {{Stream pointer might be NULL}}
// expected-note@-1 {{Stream pointer might be NULL}}
}
void check_eof_notes_feof_after_feof(void) {
FILE *F;
char Buf[10];
F = fopen("foo1.c", "r");
if (F == NULL) { // expected-note {{Taking false branch}} expected-note {{'F' is not equal to NULL}}
return;
}
fread(Buf, 1, 1, F);
if (feof(F)) { // expected-note {{Taking true branch}}
clearerr(F);
fread(Buf, 1, 1, F); // expected-note {{Assuming stream reaches end-of-file here}}
if (feof(F)) { // expected-note {{Taking true branch}}
fread(Buf, 1, 1, F); // expected-warning {{Read function called when stream is in EOF state. Function has no effect}}
// expected-note@-1 {{Read function called when stream is in EOF state. Function has no effect}}
}
}
fclose(F);
}
void check_eof_notes_feof_after_no_feof(void) {
FILE *F;
char Buf[10];
F = fopen("foo1.c", "r");
if (F == NULL) { // expected-note {{Taking false branch}} expected-note {{'F' is not equal to NULL}}
return;
}
fread(Buf, 1, 1, F);
if (feof(F)) { // expected-note {{Taking false branch}}
fclose(F);
return;
} else if (ferror(F)) { // expected-note {{Taking false branch}}
fclose(F);
return;
}
fread(Buf, 1, 1, F); // expected-note {{Assuming stream reaches end-of-file here}}
if (feof(F)) { // expected-note {{Taking true branch}}
fread(Buf, 1, 1, F); // expected-warning {{Read function called when stream is in EOF state. Function has no effect}}
// expected-note@-1 {{Read function called when stream is in EOF state. Function has no effect}}
}
fclose(F);
}
void check_eof_notes_feof_or_no_error(void) {
FILE *F;
char Buf[10];
F = fopen("foo1.c", "r");
if (F == NULL) // expected-note {{Taking false branch}} expected-note {{'F' is not equal to NULL}}
return;
int RRet = fread(Buf, 1, 1, F); // expected-note {{Assuming stream reaches end-of-file here}}
if (ferror(F)) { // expected-note {{Taking false branch}}
} else {
fread(Buf, 1, 1, F); // expected-warning {{Read function called when stream is in EOF state. Function has no effect}}
// expected-note@-1 {{Read function called when stream is in EOF state. Function has no effect}}
}
fclose(F);
}
void check_indeterminate_notes(void) {
FILE *F;
F = fopen("foo1.c", "r");
if (F == NULL) // expected-note {{Taking false branch}} \
// expected-note {{'F' is not equal to NULL}}
return;
int R = fgetc(F); // no note
if (R >= 0) { // expected-note {{Taking true branch}} \
// expected-note {{'R' is >= 0}}
fgetc(F); // expected-note {{Assuming this stream operation fails}}
if (ferror(F)) // expected-note {{Taking true branch}}
fgetc(F); // expected-warning {{File position of the stream might be 'indeterminate' after a failed operation. Can cause undefined behavior}} \
// expected-note {{File position of the stream might be 'indeterminate' after a failed operation. Can cause undefined behavior}}
}
fclose(F);
}
void check_indeterminate_after_clearerr(void) {
FILE *F;
char Buf[10];
F = fopen("foo1.c", "r");
if (F == NULL) // expected-note {{Taking false branch}} \
// expected-note {{'F' is not equal to NULL}}
return;
fread(Buf, 1, 1, F); // expected-note {{Assuming this stream operation fails}}
if (ferror(F)) { // expected-note {{Taking true branch}}
clearerr(F);
fread(Buf, 1, 1, F); // expected-warning {{might be 'indeterminate' after a failed operation}} \
// expected-note {{might be 'indeterminate' after a failed operation}}
}
fclose(F);
}
void check_indeterminate_eof(void) {
FILE *F;
char Buf[2];
F = fopen("foo1.c", "r");
if (F == NULL) // expected-note {{Taking false branch}} \
// expected-note {{'F' is not equal to NULL}} \
// expected-note {{Taking false branch}} \
// expected-note {{'F' is not equal to NULL}}
return;
fgets(Buf, sizeof(Buf), F); // expected-note {{Assuming this stream operation fails}} \
// expected-note {{Assuming stream reaches end-of-file here}}
fgets(Buf, sizeof(Buf), F); // expected-warning {{might be 'indeterminate'}} \
// expected-note {{might be 'indeterminate'}} \
// expected-warning {{stream is in EOF state}} \
// expected-note {{stream is in EOF state}}
fclose(F);
}
void check_indeterminate_fseek(void) {
FILE *F = fopen("file", "r");
if (!F) // expected-note {{Taking false branch}} \
// expected-note {{'F' is non-null}}
return;
int Ret = fseek(F, 1, SEEK_SET); // expected-note {{Assuming this stream operation fails}}
if (Ret) { // expected-note {{Taking true branch}} \
// expected-note {{'Ret' is -1}}
char Buf[2];
fwrite(Buf, 1, 2, F); // expected-warning {{might be 'indeterminate'}} \
// expected-note {{might be 'indeterminate'}}
}
fclose(F);
}
void error_fseek_ftell(void) {
FILE *F = fopen("file", "r");
if (!F) // expected-note {{Taking false branch}} \
// expected-note {{'F' is non-null}}
return;
fseek(F, 0, SEEK_END); // expected-note {{Assuming this stream operation fails}}
long size = ftell(F); // expected-warning {{might be 'indeterminate'}} \
// expected-note {{might be 'indeterminate'}}
if (size == -1) {
fclose(F);
return;
}
if (size == 1)
fprintf(F, "abcd");
fclose(F);
}
void error_fseek_read_eof(void) {
FILE *F = fopen("file", "r");
if (!F)
return;
if (fseek(F, 22, SEEK_SET) == -1) {
fclose(F);
return;
}
fgetc(F); // no warning
fclose(F);
}
void check_note_at_use_after_close(void) {
FILE *F = tmpfile();
if (!F) // expected-note {{'F' is non-null}} expected-note {{Taking false branch}}
return;
fclose(F); // expected-note {{Stream is closed here}}
rewind(F); // expected-warning {{Use of a stream that might be already closed}}
// expected-note@-1 {{Use of a stream that might be already closed}}
}
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