convert: add round trip check based on 'core.checkRoundtripEncoding'

diff --git a/strbuf.h b/strbuf.h
index 14c8c10d66b9aaa2d8f0c109cf0dd668701cb2eb..df7ced53ed2fb895eb85e7ad1bb093024fe469bb 100644 (file)
--- a/strbuf.h
+++ b/strbuf.h
@@ -607,6 +607,7 @@ __attribute__((format (printf,2,3)))
 extern int fprintf_ln(FILE *fp, const char *fmt, ...);
 
 char *xstrdup_tolower(const char *);
+char *xstrdup_toupper(const char *);
 
 /**
  * Create a newly allocated string using printf format. You can do this easily