[PATCH 3/5] Add generic routine for environment partition handling

[Juergen Beisert <jbe@pengutronix.de>]

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Juergen Beisert <jbe@pengutronix.de>
---
 common/environment.c  |   34 ++++++++++++++++++++++++++++++++++
 include/environment.h |    1 +
 2 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/common/environment.c b/common/environment.c
index eb8278f..3270a08 100644
--- a/common/environment.c
+++ b/common/environment.c
@@ -93,6 +93,40 @@ out:
 	return 1;
 }
 
+#ifdef __BAREBOX__
+int file_check_and_erase(char *filename)
+{
+	int fd;
+	int ret;
+
+	fd = open(filename, O_WRONLY | O_CREAT);
+	if (fd < 0) {
+		printf("could not open %s: %s\n", filename, errno_str());
+		return errno;
+	}
+
+	ret = protect(fd, ~0, 0, 0);
+
+	/* ENOSYS is no error here, many devices do not need it */
+	if (ret && errno != -ENOSYS) {
+		printf("could not unprotect %s: %s\n", filename, errno_str());
+		return errno;
+	}
+
+	ret = erase(fd, ~0, 0);
+
+	/* ENOSYS is no error here, many devices do not need it */
+	if (ret && errno != -ENOSYS) {
+		printf("could not erase %s: %s\n", filename, errno_str());
+		close(fd);
+		return errno;
+	}
+
+	close(fd);
+	return 0;
+}
+#endif /* __BAREBOX__ */
+
 /**
  * Make the current environment persistent
  * @param[in] filename where to store
diff --git a/include/environment.h b/include/environment.h
index 2b1f5d9..b2b95e0 100644
--- a/include/environment.h
+++ b/include/environment.h
@@ -58,6 +58,7 @@ int export(const char *);
 struct stat;
 int file_size_action(const char *, struct stat *, void *, int);
 int file_save_action(const char *, struct stat *, void *, int);
+int file_check_and_erase(char *filename);
 
 #endif /* __BAREBOX__ */
 
-- 
1.7.2.3


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