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-rw-r--r--absl/strings/substitute.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/absl/strings/substitute.h b/absl/strings/substitute.h
index 766aca42..4d0984d3 100644
--- a/absl/strings/substitute.h
+++ b/absl/strings/substitute.h
@@ -190,7 +190,12 @@ void SubstituteAndAppendArray(std::string* output, absl::string_view format,
#if defined(ABSL_BAD_CALL_IF)
constexpr int CalculateOneBit(const char* format) {
- return (*format < '0' || *format > '9') ? 0 : (1 << (*format - '0'));
+ // Returns:
+ // * 2^N for '$N' when N is in [0-9]
+ // * 0 for correct '$' escaping: '$$'.
+ // * -1 otherwise.
+ return (*format < '0' || *format > '9') ? (*format == '$' ? 0 : -1)
+ : (1 << (*format - '0'));
}
constexpr const char* SkipNumber(const char* format) {