--- a/pwm.c	Wed Sep 06 16:41:58 2017 +0200
+++ b/pwm.c	Thu Sep 07 12:40:50 2017 +0200
@@ -101,7 +101,7 @@
 }
 
 static int
-run_input_loop(struct pwm_ctx *ctx, int is_interactive)
+run_input_loop(struct pwm_ctx *ctx)
 {
 	int		retval = -1;
 	char		prompt[8 + 2 + 1];
@@ -141,7 +141,7 @@
 			fprintf(stderr, "line too long\n");
 			goto out;
 		case IO_EOF:
-			if (is_interactive) {
+			if (ctx->is_interactive) {
 				/* treat as "q" command */
 				strcpy(buf, "q\n");
 				io_retval = IO_OK;
@@ -164,13 +164,13 @@
 			err(1, "tok_tokenize");
 		case TOK_ERR_UNTERMINATED_QUOTE:
 			fprintf(stderr, "unterminated quote\n");
-			if (!is_interactive) {
+			if (!ctx->is_interactive) {
 				goto out;
 			}
 			goto next;
 		case TOK_ERR_TRAILING_BACKSLASH:
 			fprintf(stderr, "trailing backslash\n");
-			if (!is_interactive) {
+			if (!ctx->is_interactive) {
 				goto out;
 			}
 			goto next;
@@ -185,7 +185,7 @@
 		cmd = cmd_match(argv[0]);
 		if (cmd == NULL) {
 			pwm_err(ctx, "unknown command: %s", argv[0]);
-			if (is_interactive) {
+			if (ctx->is_interactive) {
 				goto next;
 			} else {
 				goto out;
@@ -198,7 +198,7 @@
 		case CMD_USAGE:
 			fprintf(stderr, "usage: %s\n", cmd->usage);
 		case CMD_ERR:	/* FALLTHROUGH */
-			if (!is_interactive) {
+			if (!ctx->is_interactive) {
 				goto out;
 			}
 			break;
@@ -310,7 +310,6 @@
 {
 	int		status = EXIT_FAILURE;
 	char		*locale;
-	int		is_interactive;
 	int		errflag = 0;
 	int		c;
 	const char	*master_password_filename = NULL;
@@ -343,7 +342,7 @@
 		goto out;
 	}
 
-	is_interactive = isatty(STDIN_FILENO);
+	ctx.is_interactive = isatty(STDIN_FILENO);
 
 	while (!errflag && (c = getopt(argc, argv, "P:h")) != -1) {
 		switch (c) {
@@ -386,7 +385,7 @@
 		goto out;
 	}
 
-	if (is_interactive) {
+	if (ctx.is_interactive) {
 		printf("pwm version %s\n", VERSION);
 	} else if (master_password_filename == NULL) {
 		fprintf(stderr, "master password file must be specified when "
@@ -419,7 +418,7 @@
 	}
 
 	/* run main input loop */
-	status = (run_input_loop(&ctx, is_interactive) != 0);
+	status = (run_input_loop(&ctx) != 0);
 
 out:
 	pwfile_destroy(&ctx);