service,strv: introduce strv_find_startswith() and make use of it

Unlike strv_find_prefix() the new call will return a pointer to the
suffix of the item we found, instead of the whole item. This is more
closer inline with what startswith() does, and allows us to simplify a
couple of invocations.

2 files changed, 18 insertions, 0 deletions

diff --git a/src/shared/strv.c b/src/shared/strv.c
index 6448f3170..0df978d23 100644
--- a/src/shared/strv.c
+++ b/src/shared/strv.c
@@ -52,6 +52,23 @@ char *strv_find_prefix(char **l, const char *name) {
         return NULL;
 }
 
+char *strv_find_startswith(char **l, const char *name) {
+        char **i, *e;
+
+        assert(name);
+
+        /* Like strv_find_prefix, but actually returns only the
+         * suffix, not the whole item */
+
+        STRV_FOREACH(i, l) {
+                e = startswith(*i, name);
+                if (e)
+                        return e;
+        }
+
+        return NULL;
+}
+
 void strv_free(char **l) {
         char **k;
 
diff --git a/src/shared/strv.h b/src/shared/strv.h
index ee55c148a..9c9633c51 100644
--- a/src/shared/strv.h
+++ b/src/shared/strv.h
@@ -28,6 +28,7 @@
 
 char *strv_find(char **l, const char *name) _pure_;
 char *strv_find_prefix(char **l, const char *name) _pure_;
+char *strv_find_startswith(char **l, const char *name) _pure_;
 
 void strv_free(char **l);
 DEFINE_TRIVIAL_CLEANUP_FUNC(char**, strv_free);