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.
llvm-svn: 108499
diff --git a/clang/lib/Basic/Builtins.cpp b/clang/lib/Basic/Builtins.cpp
index 1a32937..040cdb5 100644
--- a/clang/lib/Basic/Builtins.cpp
+++ b/clang/lib/Basic/Builtins.cpp
@@ -93,3 +93,23 @@
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;
+}
+
+