env-util: introduce strv_env_assign_many()

src/basic/env-util.c

@@ -459,6 +459,48 @@ int strv_env_assign(char ***l, const char *key, const char *value) {
         return strv_env_replace_consume(l, p);
 }
 
+int _strv_env_assign_many(char ***l, ...) {
+        va_list ap;
+        int r;
+
+        assert(l);
+
+        va_start(ap, l);
+        for (;;) {
+                const char *key, *value;
+
+                key = va_arg(ap, const char *);
+                if (!key)
+                        break;
+
+                if (!env_name_is_valid(key)) {
+                        va_end(ap);
+                        return -EINVAL;
+                }
+
+                value = va_arg(ap, const char *);
+                if (!value) {
+                        strv_env_unset(*l, key);
+                        continue;
+                }
+
+                char *p = strjoin(key, "=", value);
+                if (!p) {
+                        va_end(ap);
+                        return -ENOMEM;
+                }
+
+                r = strv_env_replace_consume(l, p);
+                if (r < 0) {
+                        va_end(ap);
+                        return r;
+                }
+        }
+        va_end(ap);
+
+        return 0;
+}
+
 char *strv_env_get_n(char **l, const char *name, size_t k, unsigned flags) {
         assert(name);
 

src/basic/env-util.h

@@ -49,6 +49,8 @@ int strv_env_replace_consume(char ***l, char *p); /* In place ... */
 int strv_env_replace_strdup(char ***l, const char *assignment);
 int strv_env_replace_strdup_passthrough(char ***l, const char *assignment);
 int strv_env_assign(char ***l, const char *key, const char *value);
+int _strv_env_assign_many(char ***l, ...) _sentinel_;
+#define strv_env_assign_many(l, ...) _strv_env_assign_many(l, __VA_ARGS__, NULL)
 
 char *strv_env_get_n(char **l, const char *name, size_t k, unsigned flags) _pure_;
 char *strv_env_get(char **x, const char *n) _pure_;

src/test/test-env-util.c

@@ -133,6 +133,32 @@ TEST(strv_env_assign) {
         assert_se(streq(a[0], "a=A"));
 }
 
+TEST(strv_env_assign_many) {
+        _cleanup_strv_free_ char **a = NULL;
+
+        assert_se(strv_env_assign_many(&a, "a", "a", "b", "b") >= 0);
+
+        assert_se(strv_length(a) == 2);
+        assert_se(strv_contains(a, "a=a"));
+        assert_se(strv_contains(a, "b=b"));
+
+        assert_se(strv_env_assign_many(&a, "a", "A", "b", "b", "c", "c") >= 0);
+        assert_se(strv_length(a) == 3);
+        assert_se(strv_contains(a, "a=A"));
+        assert_se(strv_contains(a, "b=b"));
+        assert_se(strv_contains(a, "c=c"));
+
+        assert_se(strv_env_assign_many(&a, "b", NULL, "c", "C") >= 0);
+        assert_se(strv_length(a) == 2);
+        assert_se(strv_contains(a, "a=A"));
+        assert_se(strv_contains(a, "c=C"));
+
+        assert_se(strv_env_assign_many(&a, "a=", "B") == -EINVAL);
+        assert_se(strv_length(a) == 2);
+        assert_se(strv_contains(a, "a=A"));
+        assert_se(strv_contains(a, "c=C"));
+}
+
 TEST(env_strv_get_n) {
         const char *_env[] = {
                 "FOO=NO NO NO",