Add builtin definition for scanf, including extending the builtin encoding to

represent builtins that have the "scanf" attribution (via the format attribute) just
like we do with printf functions.  Follow-up work is needed to add similar support
for fscanf et al.

This is to support format-string checking for scanf functions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@108499 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 20 insertions, 0 deletions

diff --git a/lib/Basic/Builtins.cpp b/lib/Basic/Builtins.cpp
index 1a3293775e..040cdb5d55 100644
--- a/lib/Basic/Builtins.cpp
+++ b/lib/Basic/Builtins.cpp
@@ -93,3 +93,23 @@ Builtin::Context::isPrintfLike(unsigned ID, unsigned &FormatIdx,
   return true;
 }
 
+// FIXME: Refactor with isPrintfLike.
+bool
+Builtin::Context::isScanfLike(unsigned ID, unsigned &FormatIdx,
+                              bool &HasVAListArg) {
+  const char *Scanf = strpbrk(GetRecord(ID).Attributes, "sS");
+  if (!Scanf)
+    return false;
+
+  HasVAListArg = (*Scanf == 'S');
+
+  ++Scanf;
+  assert(*Scanf == ':' && "s or S specifier must have be followed by a ':'");
+  ++Scanf;
+
+  assert(strchr(Scanf, ':') && "printf specifier must end with a ':'");
+  FormatIdx = strtol(Scanf, 0, 10);
+  return true;
+}
+
+