allow multiple symbols/integers inside curly brackets in preproc

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/preproc/char_util.h b/tools/preproc/char_util.h
index 05f9a1dd4..ab20dbc53 100644
--- a/tools/preproc/char_util.h
+++ b/tools/preproc/char_util.h
@@ -56,6 +56,12 @@ inline bool IsAsciiPrintable(unsigned char c)
     return (c >= ' ' && c <= '~');
 }
 
+// Returns whether the character can start the identifier of a "{FOO}" constant in strings.
+inline bool IsIdentifierStartingChar(unsigned char c)
+{
+    return IsAsciiAlpha(c) || c == '_';
+}
+
 // Returns whether the character can be used in the identifier of a "{FOO}" constant in strings.
 inline bool IsIdentifierChar(unsigned char c)
 {