================
@@ -339,3 +363,138 @@ void fflush_on_open_failed_stream(void) {
}
fclose(F);
}
+
+void test_fscanf_eof() {
+ FILE *F1 = tmpfile();
+ if (!F1)
+ return;
+
+ int a;
+ unsigned b;
+ int ret = fscanf(F1, "%d %u", &a, &b);
+ char c = fgetc(F1); // expected-warning {{Read function called when stream
is in EOF state. Function has no effect}}
+ // expected-warning@-1 {{File position of the stream might be
'indeterminate' after a failed operation. Can cause undefined behavior}}
+ fclose(F1);
+}
+
+void test_fscanf_escape() {
+ FILE *F1 = tmpfile();
+ if (!F1)
+ return;
+
+ int a = 48;
+ unsigned b = 127;
+ char buffer[] = "FSCANF"; // 70 83 67 65 78 70
+
+ clang_analyzer_dump_int(a); // expected-warning {{48 S32b}}
+ clang_analyzer_dump_int(b); // expected-warning {{127 S32b}}
+ clang_analyzer_dump_char(buffer[2]); // expected-warning {{67 S8b}}
+
+ int ret = fscanf(F1, "%d %u %s", &a, &b, buffer);
+ if (ret != EOF) {
+ clang_analyzer_dump_int(a); // expected-warning {{conj_$}}
+ clang_analyzer_dump_int(b); // expected-warning {{conj_$}}
+ clang_analyzer_dump_char(buffer[2]); // expected-warning {{derived_$}}
+ } else {
+ clang_analyzer_dump_int(a); // expected-warning {{48 S32b}}
+ clang_analyzer_dump_int(b); // expected-warning {{127 S32b}}
+ clang_analyzer_dump_char(buffer[2]); // expected-warning {{67 S8b}}
+ }
+
+ if (ret != EOF) {
+ char c = fgetc(F1); // ok
+ }
+
+ fclose(F1);
+}
+
+void test_fputc() {
+ FILE *F1 = tmpfile();
+ if (!F1)
+ return;
+
+ char a = 'y'; // 'y' = 121 ASCII
+ char r = fputc(a, F1);
+ if (r != EOF) {
+ clang_analyzer_dump_char(r); // expected-warning {{121 S8b}}
+ char z = fgetc(F1);
+ } else {
+ clang_analyzer_dump_char(r); // expected-warning {{-1 S8b}}
+ }
+
+ fclose(F1);
+}
+
+void test_fputs() {
+ FILE *F1 = tmpfile();
+ if (!F1)
+ return;
+
+ char buffer[] = "HELLO";
+ int r = fputs(buffer, F1);
+ if (r >= 0) {
+ // fputs does not invalidate the input buffer (72 is ascii for 'H')
+ clang_analyzer_dump_char(buffer[0]); // expected-warning {{72 S8b}}
+ } else if (r == EOF) {
+ // fputs does not invalidate the input buffer, *and* this branch
+ // can happen
+ clang_analyzer_dump_char(buffer[0]); // expected-warning {{72 S8b}}
+ } else {
+ // This branch can not happen
----------------
balazske wrote:
`clang_analyzer_warnIfReached` can be used here, but really this case is tested
in another test in **stream_error.c** too.
https://github.com/llvm/llvm-project/pull/82476
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