73   return NULL;  in env_match()
81   if (name == NULL) {  in __is_valid_environment_variable()
139       NULL  in __is_unsafe_environment_variable()
141   for (size_t i = 0; UNSAFE_VARIABLE_NAMES[i] != NULL; ++i) {  in __is_unsafe_environment_variable()
142     if (env_match(name, UNSAFE_VARIABLE_NAMES[i]) != NULL) {  in __is_unsafe_environment_variable()
152   for (; src[0] != NULL; ++src) {  in __sanitize_environment_variables()
163   dst[0] = NULL;  in __sanitize_environment_variables()
175   if (name == NULL || name[0] == '\0') {  in linker_env_get()
176     return NULL;  in linker_env_get()
179   for (char** p = _envp; p[0] != NULL; ++p) {  in linker_env_get()
181     if (val != NULL) {  in linker_env_get()
183         return NULL; // Return NULL for empty strings.  in linker_env_get()
188   return NULL;  in linker_env_get()