From 5058bd7e1f0ae226d835253fcf333da3ab8d2806 Mon Sep 17 00:00:00 2001
From: Ludwig Nussel <ludwig.nussel@suse.de>
Date: Tue, 9 Jan 2024 17:31:01 +0100
Subject: [PATCH] strv: introduce strv_copy_unless_empty()

---
 src/basic/strv.c | 16 ++++++++++++++++
 src/basic/strv.h |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/src/basic/strv.c b/src/basic/strv.c
index 908e9e2513..fa17631aa0 100644
--- a/src/basic/strv.c
+++ b/src/basic/strv.c
@@ -123,6 +123,22 @@ char** strv_copy_n(char * const *l, size_t m) {
         return TAKE_PTR(result);
 }
 
+int strv_copy_unless_empty(char * const *l, char ***ret) {
+        assert(ret);
+
+        if (strv_isempty(l)) {
+                *ret = NULL;
+                return 0;
+        }
+
+        char **copy = strv_copy(l);
+        if (!copy)
+                return -ENOMEM;
+
+        *ret = TAKE_PTR(copy);
+        return 1;
+}
+
 size_t strv_length(char * const *l) {
         size_t n = 0;
 
diff --git a/src/basic/strv.h b/src/basic/strv.h
index f1a8bc4910..7361faed84 100644
--- a/src/basic/strv.h
+++ b/src/basic/strv.h
@@ -38,6 +38,8 @@ char** strv_copy_n(char * const *l, size_t n);
 static inline char** strv_copy(char * const *l) {
         return strv_copy_n(l, SIZE_MAX);
 }
+int strv_copy_unless_empty(char * const *l, char ***ret);
+
 size_t strv_length(char * const *l) _pure_;
 
 int strv_extend_strv(char ***a, char * const *b, bool filter_duplicates);