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stream-error.c
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stream-error.c
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// RUN: %clang_analyze_cc1 -verify %s \
// RUN: -analyzer-checker=core \
// RUN: -analyzer-checker=alpha.unix.Stream \
// RUN: -analyzer-checker=debug.StreamTester \
// RUN: -analyzer-checker=debug.ExprInspection
#include "Inputs/system-header-simulator.h"
void clang_analyzer_eval(int);
void clang_analyzer_warnIfReached();
void StreamTesterChecker_make_feof_stream(FILE *);
void StreamTesterChecker_make_ferror_stream(FILE *);
void error_fopen() {
FILE *F = fopen("file", "r");
if (!F)
return;
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
fclose(F);
}
void error_freopen() {
FILE *F = fopen("file", "r");
if (!F)
return;
F = freopen(0, "w", F);
if (!F)
return;
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
fclose(F);
}
void stream_error_feof() {
FILE *F = fopen("file", "r");
if (!F)
return;
StreamTesterChecker_make_feof_stream(F);
clang_analyzer_eval(feof(F)); // expected-warning {{TRUE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
clearerr(F);
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
fclose(F);
}
void stream_error_ferror() {
FILE *F = fopen("file", "r");
if (!F)
return;
StreamTesterChecker_make_ferror_stream(F);
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{TRUE}}
clearerr(F);
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
fclose(F);
}
void error_fread() {
FILE *F = tmpfile();
if (!F)
return;
char Buf[10];
int Ret = fread(Buf, 1, 10, F);
if (Ret == 10) {
clang_analyzer_eval(feof(F) || ferror(F)); // expected-warning {{FALSE}}
} else {
clang_analyzer_eval(feof(F) || ferror(F)); // expected-warning {{TRUE}}
if (feof(F)) {
clang_analyzer_warnIfReached(); // expected-warning {{REACHABLE}}
fread(Buf, 1, 10, F); // expected-warning {{Read function called when stream is in EOF state}}
clang_analyzer_eval(feof(F)); // expected-warning {{TRUE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
}
if (ferror(F)) {
clang_analyzer_warnIfReached(); // expected-warning {{REACHABLE}}
fread(Buf, 1, 10, F); // expected-warning {{might be 'indeterminate'}}
}
}
fclose(F);
Ret = fread(Buf, 1, 10, F); // expected-warning {{Stream might be already closed}}
}
void error_fwrite() {
FILE *F = tmpfile();
if (!F)
return;
const char *Buf = "123456789";
int Ret = fwrite(Buf, 1, 10, F);
if (Ret == 10) {
clang_analyzer_eval(feof(F) || ferror(F)); // expected-warning {{FALSE}}
} else {
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{TRUE}}
fwrite(0, 1, 10, F); // expected-warning {{might be 'indeterminate'}}
}
fclose(F);
Ret = fwrite(0, 1, 10, F); // expected-warning {{Stream might be already closed}}
}
void freadwrite_zerosize(FILE *F) {
fwrite(0, 1, 0, F);
fwrite(0, 0, 1, F);
fread(0, 1, 0, F);
fread(0, 0, 1, F);
}
void freadwrite_zerosize_eofstate(FILE *F) {
fwrite(0, 1, 0, F);
fwrite(0, 0, 1, F);
fread(0, 1, 0, F); // expected-warning {{Read function called when stream is in EOF state}}
fread(0, 0, 1, F); // expected-warning {{Read function called when stream is in EOF state}}
}
void error_fread_fwrite_zerosize() {
FILE *F = fopen("file", "r");
if (!F)
return;
freadwrite_zerosize(F);
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
StreamTesterChecker_make_ferror_stream(F);
freadwrite_zerosize(F);
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{TRUE}}
StreamTesterChecker_make_feof_stream(F);
freadwrite_zerosize_eofstate(F);
clang_analyzer_eval(feof(F)); // expected-warning {{TRUE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
fclose(F);
}
void error_fseek() {
FILE *F = fopen("file", "r");
if (!F)
return;
int rc = fseek(F, 0, SEEK_SET);
if (rc) {
int IsFEof = feof(F), IsFError = ferror(F);
// Get feof or ferror or no error.
clang_analyzer_eval(IsFEof || IsFError);
// expected-warning@-1 {{FALSE}}
// expected-warning@-2 {{TRUE}}
clang_analyzer_eval(IsFEof && IsFError); // expected-warning {{FALSE}}
// Error flags should not change.
if (IsFEof)
clang_analyzer_eval(feof(F)); // expected-warning {{TRUE}}
else
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
if (IsFError)
clang_analyzer_eval(ferror(F)); // expected-warning {{TRUE}}
else
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
} else {
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
// Error flags should not change.
clang_analyzer_eval(feof(F)); // expected-warning {{FALSE}}
clang_analyzer_eval(ferror(F)); // expected-warning {{FALSE}}
}
fclose(F);
}
void error_indeterminate() {
FILE *F = fopen("file", "r+");
if (!F)
return;
const char *Buf = "123456789";
int rc = fseek(F, 0, SEEK_SET);
if (rc) {
if (feof(F)) {
fwrite(Buf, 1, 10, F); // no warning
} else if (ferror(F)) {
fwrite(Buf, 1, 10, F); // expected-warning {{might be 'indeterminate'}}
} else {
fwrite(Buf, 1, 10, F); // expected-warning {{might be 'indeterminate'}}
}
}
fclose(F);
}
void error_indeterminate_clearerr() {
FILE *F = fopen("file", "r+");
if (!F)
return;
const char *Buf = "123456789";
int rc = fseek(F, 0, SEEK_SET);
if (rc) {
if (feof(F)) {
clearerr(F);
fwrite(Buf, 1, 10, F); // no warning
} else if (ferror(F)) {
clearerr(F);
fwrite(Buf, 1, 10, F); // expected-warning {{might be 'indeterminate'}}
} else {
clearerr(F);
fwrite(Buf, 1, 10, F); // expected-warning {{might be 'indeterminate'}}
}
}
fclose(F);
}
void error_indeterminate_feof1() {
FILE *F = fopen("file", "r+");
if (!F)
return;
char Buf[10];
if (fread(Buf, 1, 10, F) < 10) {
if (feof(F)) {
// error is feof, should be non-indeterminate
fwrite("1", 1, 1, F); // no warning
}
}
fclose(F);
}
void error_indeterminate_feof2() {
FILE *F = fopen("file", "r+");
if (!F)
return;
char Buf[10];
if (fread(Buf, 1, 10, F) < 10) {
if (ferror(F) == 0) {
// error is feof, should be non-indeterminate
fwrite("1", 1, 1, F); // no warning
}
}
fclose(F);
}