From 70921b8e9b66021c38020ab1aad8d61b3634fdf0 Mon Sep 17 00:00:00 2001
From: Alberto Leiva Popper <ydahhrk@gmail.com>
Date: Mon, 6 May 2024 16:10:14 -0600
Subject: [PATCH] Allow --mode=print to read file from stdin

Either works:

	$ fort --mode=print   < cert.cer
	$ fort --mode=print - < cert.cer

Progress for #122.
---
 src/config.c     |  4 +---
 src/print_file.c | 13 +++++++++----
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/config.c b/src/config.c
index 3bf9fcd9..87040334 100644
--- a/src/config.c
+++ b/src/config.c
@@ -993,9 +993,7 @@ static int
 validate_config(void)
 {
 	if (rpki_config.mode == PRINT_FILE)
-		return (rpki_config.payload == NULL)
-		    ? pr_op_err("Missing file name.")
-		    : 0;
+		return 0;
 
 	if (rpki_config.payload != NULL)
 		return pr_op_err("I don't know what '%s' is.",
diff --git a/src/print_file.c b/src/print_file.c
index b310d41c..7bb4572c 100644
--- a/src/print_file.c
+++ b/src/print_file.c
@@ -169,9 +169,13 @@ print_file(void)
 	json_t *json = NULL;
 	int error = 0;
 
-	file = fopen(filename, "rb");
-	if (file == NULL)
-		return pr_op_err("Cannot open file: %s", strerror(errno));
+	if (filename == NULL || strcmp(filename, "-") == 0) {
+		file = stdin;
+	} else {
+		file = fopen(filename, "rb");
+		if (file == NULL)
+			return pr_op_err("Cannot open file: %s", strerror(errno));
+	}
 
 	switch (guess_file_type(file)) {
 	case FT_UNK:
@@ -190,7 +194,8 @@ print_file(void)
 		break;
 	}
 
-	fclose(file);
+	if (file != stdin)
+		fclose(file);
 	if (error)
 		return error;
 	if (json == NULL)
-- 
2.47.2