| // 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); |
| } |
