[clang] [clang][analyzer] Add missing stream related functions to StdLibraryFunctionsChecker. (PR #76979)

[Ben Shi via cfe-commits]

=?utf-8?q?Bal=C3=A1zs_K=C3=A9ri?= <balazs.keri at ericsson.com>,
=?utf-8?q?Bal=C3=A1zs_K=C3=A9ri?= <balazs.keri at ericsson.com>,
=?utf-8?q?Bal=C3=A1zs_K=C3=A9ri?= <balazs.keri at ericsson.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/76979 at github.com>


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@@ -2201,6 +2214,56 @@ void StdLibraryFunctionsChecker::initFunctionSummaries(
                   ErrnoNEZeroIrrelevant, GenericFailureMsg)
             .ArgConstraint(NotNull(ArgNo(0))));
 
+    // int fgetc(FILE *stream);
+    // 'getc' is the same as 'fgetc' but may be a macro
+    addToFunctionSummaryMap(
+        {"getc", "fgetc"}, Signature(ArgTypes{FilePtrTy}, RetType{IntTy}),
+        Summary(NoEvalCall)
+            .Case({ReturnValueCondition(WithinRange, {{0, UCharRangeMax}})},
+                  ErrnoMustNotBeChecked, GenericSuccessMsg)
+            .Case({ReturnValueCondition(WithinRange, SingleValue(EOFv))},
+                  ErrnoNEZeroIrrelevant, GenericFailureMsg)
+            .ArgConstraint(NotNull(ArgNo(0))));
+
+    // int fputc(int c, FILE *stream);
+    // 'putc' is the same as 'fputc' but may be a macro
+    addToFunctionSummaryMap(
+        {"putc", "fputc"},
+        Signature(ArgTypes{IntTy, FilePtrTy}, RetType{IntTy}),
+        Summary(NoEvalCall)
+            .Case({ReturnValueCondition(BO_EQ, ArgNo(0))},
+                  ErrnoMustNotBeChecked, GenericSuccessMsg)
+            .Case({ReturnValueCondition(WithinRange, SingleValue(EOFv))},
+                  ErrnoNEZeroIrrelevant, GenericFailureMsg)
+            .ArgConstraint(NotNull(ArgNo(1)))
+            .ArgConstraint(
+                ArgumentCondition(0, WithinRange, {{0, UCharRangeMax}})));
+
+    // char *fgets(char *restrict s, int n, FILE *restrict stream);
+    addToFunctionSummaryMap(
+        "fgets",
+        Signature(ArgTypes{CharPtrRestrictTy, IntTy, FilePtrRestrictTy},
+                  RetType{CharPtrTy}),
+        Summary(NoEvalCall)
+            .Case({ReturnValueCondition(BO_EQ, ArgNo(0))},
+                  ErrnoMustNotBeChecked, GenericSuccessMsg)
+            .Case({IsNull(Ret)}, ErrnoNEZeroIrrelevant, GenericFailureMsg)
+            .ArgConstraint(NotNull(ArgNo(0)))
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benshi001 wrote:

also it would be better to add a `FIXME` here.

https://github.com/llvm/llvm-project/pull/76979