char **strv_copy(char * const *l);
unsigned strv_length(char * const *l) _pure_;
int strv_extend_strv(char ***a, char **b);
int strv_extend_strv_concat(char ***a, char **b, const char *suffix);
int strv_extend(char ***l, const char *value);
char **strv_copy(char * const *l);
unsigned strv_length(char * const *l) _pure_;
int strv_extend_strv(char ***a, char **b);
int strv_extend_strv_concat(char ***a, char **b, const char *suffix);
int strv_extend(char ***l, const char *value);