Move string hash function to librpmio and rename for namespacing

- There are places in rpmio and build that would benefit from hashing, but
  hashFunctionString() being internal to librpm has prevented that. Rename
  to rstrhash() to resemble the other foo in rpmstring.h for
  minimal namespacing as its now public function and update callers.
- Also mark the function as "pure" - it only looks at its arguments.
  This is one of the busiest functions in entire rpm so any optimization
  no matter how minor is well worth it.
- Hereby awarding hashFunctionString() with the grand prize for
  the Most Moved Around Function in rpm ;)

1 files changed, 8 insertions, 0 deletions

diff --git a/rpmio/rpmstring.h b/rpmio/rpmstring.h
index 4e8a5dbf7..a1d90d8ee 100644
--- a/rpmio/rpmstring.h
+++ b/rpmio/rpmstring.h
@@ -172,6 +172,14 @@ char *rstrscat(char **dest, const char *arg, ...) RPM_GNUC_NULL_TERMINATED;
  */
 size_t rstrlcpy(char *dest, const char *src, size_t n);
 
+/** \ingroup rpmstring
+ * String hashing function
+ * @param string	string to hash
+ * @return		hash id
+ */
+RPM_GNUC_PURE
+unsigned int rstrhash(const char * string);
+
 #ifdef __cplusplus
 }
 #endif