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fs/fs.c: read up to EOF when len would read past EOF

Browse source 
http://lists.denx.de/pipermail/u-boot/2012-September/134347.html
allows for reading files in chunks from the shell.

When this feature is used to read past the end of a file an error
was returned instead of returning the bytes read up to the end of
file. Thus the following fails in the shell:

offset = 0
len = chunksize
do
	read file, offset, len
	write data
until bytes_read < len

The patch changes the behaviour to printing an informational
message and returning the actual read number of bytes aka read(2)
behaviour for convenient use in U-Boot scripts.

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
This commit is contained in:
Max Krummenacher 2015-08-05 17:16:58 +02:00 committed by Tom Rini
parent f06b454b1c
commit 7a3e70cfd8
1 changed files with 2 additions and 4 deletions
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6
fs/fs.c
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@ -301,10 +301,8 @@ int fs_read(const char *filename, ulong addr, loff_t offset, loff_t len,
unmap_sysmem(buf);
/* If we requested a specific number of bytes, check we got it */
if (ret == 0 && len && *actread != len) {
printf("** Unable to read file %s **\n", filename);
ret = -1;
}
if (ret == 0 && len && *actread != len)
printf("** %s shorter than offset + len **\n", filename);
fs_close();
return ret;