atom: add xkb_atom_lookup

This will only lookup the string and return the atom if found; it will
not intern it if not. This is useful when e.g. getting a string from the
user (which may be arbitrary) and comparing against atoms.

Signed-off-by: Ran Benita <ran234@gmail.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/atom.c b/src/atom.c
index b5521ab..66cf2cf 100644
--- a/src/atom.c
+++ b/src/atom.c
@@ -185,6 +185,21 @@ find_node_pointer(struct atom_table *table, const char *string,
     return found;
 }
 
+xkb_atom_t
+atom_lookup(struct atom_table *table, const char *string)
+{
+    struct atom_node **np;
+    unsigned int fp;
+
+    if (!string)
+        return XKB_ATOM_NONE;
+
+    if (!find_node_pointer(table, string, &np, &fp))
+        return XKB_ATOM_NONE;
+
+    return (*np)->atom;
+}
+
 /*
  * If steal is true, we do not strdup @string; therefore it must be
  * dynamically allocated, not be free'd by the caller and not be used