Add dfacopysyntax function and use it.

1 files changed, 5 insertions, 0 deletions

diff --git a/dfa.h b/dfa.h
index 0fd9b2c9..c68b4df7 100644
--- a/dfa.h
+++ b/dfa.h
@@ -110,6 +110,11 @@ extern struct dfa *dfasuperset (struct dfa const *d) _GL_ATTRIBUTE_PURE;
 /* The DFA is likely to be fast.  */
 extern bool dfaisfast (struct dfa const *) _GL_ATTRIBUTE_PURE;
 
+/* Copy the syntax settings from one dfa instance to another.
+   Saves considerable computation time if compiling many regular expressions
+   based on the same setting.  */
+extern void dfacopysyntax (struct dfa *to, const struct dfa *from);
+
 /* Free the storage held by the components of a struct dfa. */
 extern void dfafree (struct dfa *);