From 133c08ba914cdfe533693a1633fe4377b6e255f9 Mon Sep 17 00:00:00 2001
From: batt <batt@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Wed, 24 Sep 2008 16:36:13 +0000
Subject: [PATCH 1/1] Handle reading outside EOF.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@1842 38d2e660-2303-0410-9eaa-f027e97ec537
---
 bertos/fs/battfs.c      |  2 +-
 bertos/fs/battfs_test.c | 39 +++++++++++++++++++++++++++++++++++++++
 bertos/kern/kfile.c     |  3 +--
 3 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/bertos/fs/battfs.c b/bertos/fs/battfs.c
index 9bc8bdfd..11908590 100644
--- a/bertos/fs/battfs.c
+++ b/bertos/fs/battfs.c
@@ -665,7 +665,7 @@ static size_t battfs_read(struct KFile *fd, void *_buf, size_t size)
 	pgaddr_t addr_offset;
 	pgaddr_t read_len;
 
-	size = MIN((kfile_off_t)size, fd->size - fd->seek_pos);
+	size = MIN((kfile_off_t)size, MAX(fd->size - fd->seek_pos, 0));
 
 	while (size)
 	{
diff --git a/bertos/fs/battfs_test.c b/bertos/fs/battfs_test.c
index 8ab33a48..c1cd89e6 100644
--- a/bertos/fs/battfs_test.c
+++ b/bertos/fs/battfs_test.c
@@ -748,6 +748,44 @@ static void increaseFile(BattFsSuper *disk)
 	TRACEMSG("17: passed\n");
 }
 
+static void readEOF(BattFsSuper *disk)
+{
+	BattFs fd1;
+	uint8_t buf[16];
+
+	TRACEMSG("18: reading over EOF test\n");
+
+	fp = fopen(test_filename, "w+");
+
+	unsigned int PAGE_FILL = PAGE_SIZE - BATTFS_HEADER_LEN;
+	inode_t INODE = 0;
+	inode_t INODE2 = 4;
+	unsigned int MODE = 0;
+
+	disk->erase(disk, 0);
+	battfs_writeTestBlock(disk, 1, INODE, 0, PAGE_FILL, 0);
+	battfs_writeTestBlock(disk, 2, INODE, 3, PAGE_FILL, 1);
+	battfs_writeTestBlock(disk, 3, INODE, 0, PAGE_FILL, 1);
+	disk->erase(disk, 4);
+	battfs_writeTestBlock(disk, 5, INODE2, 0, PAGE_FILL, 0);
+	battfs_writeTestBlock(disk, 6, INODE2, 1, PAGE_FILL, 1);
+	battfs_writeTestBlock(disk, 7, INODE2, 0, PAGE_FILL, 1);
+
+	fclose(fp);
+
+	ASSERT(battfs_init(disk));
+	ASSERT(battfs_fileopen(disk, &fd1, INODE, MODE));
+	ASSERT(kfile_seek(&fd1.fd, fd1.fd.size + 10, SEEK_SET) == fd1.fd.size + 10);
+	ASSERT(fd1.fd.seek_pos == fd1.fd.size + 10);
+	ASSERT(kfile_read(&fd1.fd, buf, sizeof(buf)) == 0);
+
+	ASSERT(kfile_close(&fd1.fd) == 0);
+	ASSERT(battfs_close(disk));
+
+	TRACEMSG("18: passed\n");
+}
+
+
 int battfs_testRun(void)
 {
 	BattFsSuper disk;
@@ -776,6 +814,7 @@ int battfs_testRun(void)
 	createFile(&disk);
 	multipleWrite(&disk);
 	increaseFile(&disk);
+	readEOF(&disk);
 
 	kprintf("All tests passed!\n");
 
diff --git a/bertos/kern/kfile.c b/bertos/kern/kfile.c
index cab20aa6..2d8a2f84 100644
--- a/bertos/kern/kfile.c
+++ b/bertos/kern/kfile.c
@@ -197,8 +197,7 @@ kfile_off_t kfile_genericSeek(struct KFile *fd, kfile_off_t offset, KSeekMode wh
 	/* Bound check */
 	if (seek_pos + offset > fd->size)
 	{
-		ASSERT(0);
-		return EOF;
+		LOG_INFO("seek outside EOF\n");
 	}
 
 	fd->seek_pos = seek_pos + offset;
-- 
2.25.1