/*
 * 974_getenv_run — execute the lib/os getenv smoke fixture under the
 * C-side `ww run` driver and assert exit 0.
 *
 * Pre-arranges the environment that lib/os/os_test.ww asserts against:
 *
 *   WW_TEST_GETENV   = "hello-world"   (set, non-empty)
 *   WW_TEST_EMPTY    = ""              (set, empty value)
 *   WW_TEST_NOT_SET  unset             (unsetenv-cleared)
 *
 * The child `ww run` process inherits this env, so os_test.ww's
 * `os.getenv` calls see exactly the state we configured here. This
 * is the "C-side env arrangement" pattern (parent sets, child reads)
 * — proper POSIX shape for stdlib testing without a `setenv` ww
 * primitive (deferred per drew/rob).
 *
 * Same wrapper shape as 970_fmt_run / 971_log_run / 972_fnmatch_run
 * / 973_shlex_run.
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>

static int
runwait(const char *cmd)
{
	int rc = system(cmd);
	if (rc == -1) return -1;
	if (WIFEXITED(rc)) return WEXITSTATUS(rc);
	return 1;
}

int
main(void)
{
	const char *bin = getenv("BIN");
	if (!bin) bin = "out/bin";
	char absbin[1024];
	if (bin[0] != '/') {
		char cwd[1024];
		if (getcwd(cwd, sizeof cwd) == NULL) return 1;
		snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
		bin = absbin;
	}
	char cwd[1024];
	if (getcwd(cwd, sizeof cwd) == NULL) return 1;

	/* Pre-arrange the env state os_test.ww asserts against. */
	setenv("WW_TEST_GETENV", "hello-world", 1);
	setenv("WW_TEST_EMPTY", "", 1);
	unsetenv("WW_TEST_NOT_SET");

	const char *src = "lib/os/os_test.ww";
	char path[1024], cmd[2048];
	snprintf(path, sizeof path, "%s/%s", cwd, src);
	snprintf(cmd, sizeof cmd, "%s/ww test %s", bin, path);
	int rc = runwait(cmd);
	if (rc != 0) {
		fprintf(stderr, "getenv_run FAIL: %s exited %d\n", src, rc);
		return 1;
	}
	printf("getenv_run: %s ok\n", src);
	return 0;
}