From b0548df2040aff713baa77cac079a2971b3ed9d7 Mon Sep 17 00:00:00 2001
From: "S.J.R. van Schaik" <stephan@whiteboxsystems.nl>
Date: Fri, 16 Jun 2017 16:36:15 +0200
Subject: [PATCH] shell: mufs: check if the file system has been mounted

---
 source/shell/mufs.c | 42 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/source/shell/mufs.c b/source/shell/mufs.c
index a0b85fb..34abbaa 100644
--- a/source/shell/mufs.c
+++ b/source/shell/mufs.c
@@ -42,7 +42,7 @@ static struct cmd mufs_cmds[] = {
 };
 
 extern struct flash_dev *flash;
-struct mufs *mufs;
+struct mufs *mufs = NULL;
 
 static void do_mufs_mount(const char *s)
 {
@@ -97,6 +97,11 @@ static void do_mufs_format(const char *s)
 
 static void do_mufs_mkdir(const char *s)
 {
+	if (!mufs) {
+		fprintf(stderr, "error: no file system mounted.\n");
+		return;
+	}
+
 	if (mufs_mkdir(mufs, s) < 0) {
 		fprintf(stderr, "error: unable to create the directory\n");
 		return;
@@ -105,6 +110,11 @@ static void do_mufs_mkdir(const char *s)
 
 static void do_mufs_rmdir(const char *s)
 {
+	if (!mufs) {
+		fprintf(stderr, "error: no file system mounted.\n");
+		return;
+	}
+
 	if (mufs_rmdir(mufs, s) < 0) {
 		fprintf(stderr, "error: unable to remove the directory\n");
 		return;
@@ -115,6 +125,11 @@ static void do_mufs_stat(const char *s)
 {
 	struct mufs_stat stat;
 
+	if (!mufs) {
+		fprintf(stderr, "error: no file system mounted.\n");
+		return;
+	}
+
 	if (mufs_stat(mufs, s, &stat) < 0) {
 		fprintf(stderr, "error: unable to stat the file\n");
 		return;
@@ -134,6 +149,11 @@ static void do_mufs_cat(const char *s)
 	char data[256];
 	struct mufs_file *file;
 
+	if (!mufs) {
+		fprintf(stderr, "error: no file system mounted.\n");
+		return;
+	}
+
 	if (!(file = mufs_open(mufs, s, MUFS_READ))) {
 		fprintf(stderr, "error: unable to open the file\n");
 		return;
@@ -151,6 +171,11 @@ static void do_mufs_append(const char *s)
 	struct mufs_file *file;
 	char *path, *line;
 
+	if (!mufs) {
+		fprintf(stderr, "error: no file system mounted.\n");
+		return;
+	}
+
 	if (!(path = malloc(strlen(s) + 2)))
 		return;
 
@@ -180,6 +205,11 @@ static void do_mufs_mv(const char *s)
 {
 	char *old, *new;
 
+	if (!mufs) {
+		fprintf(stderr, "error: no file system mounted.\n");
+		return;
+	}
+
 	if (!(old = strdup(s)))
 		return;
 
@@ -201,6 +231,11 @@ err_free_old:
 
 static void do_mufs_rm(const char *s)
 {
+	if (!mufs) {
+		fprintf(stderr, "error: no file system mounted.\n");
+		return;
+	}
+
 	if (mufs_unlink(mufs, s) < 0) {
 		fprintf(stderr, "error: unable to remove the file\n");
 		return;
@@ -212,6 +247,11 @@ static void do_mufs_ls(const char *s)
 	struct mufs_dirent ent;
 	struct mufs_dir *dir;
 
+	if (!mufs) {
+		fprintf(stderr, "error: no file system mounted.\n");
+		return;
+	}
+
 	if (!(dir = mufs_opendir(mufs, s))) {
 		fprintf(stderr, "error: unable to open the directory\n");
 		return;