env-util: add strv_env_pairs_get helper

src/basic/env-util.c

@@ -455,6 +455,18 @@ char *strv_env_get(char **l, const char *name) {
         return strv_env_get_n(l, name, strlen(name), 0);
 }
 
+char *strv_env_pairs_get(char **l, const char *name) {
+        char **key, **value, *result = NULL;
+
+        assert(name);
+
+        STRV_FOREACH_PAIR(key, value, l)
+                if (streq(*key, name))
+                        result = *value;
+
+        return result;
+}
+
 char **strv_env_clean_with_callback(char **e, void (*invalid_callback)(const char *p, void *userdata), void *userdata) {
         char **p, **q;
         int k = 0;

src/basic/env-util.h

@@ -50,6 +50,7 @@ int strv_env_assign(char ***l, const char *key, const char *value);
 
 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_;
+char *strv_env_pairs_get(char **l, const char *name) _pure_;
 
 int getenv_bool(const char *p);
 int getenv_bool_secure(const char *p);