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Appending multiple times to same string is slow since strcat() needs
to determine the end during each run. So manually maintain a pointer
to the end to speed-up things.
Signed-off-by: Michael Heimpold <michael.heimpold@i2se.com>
Cc: Michael Heimpold <mhei@heimpold.de>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Chris Ball <chris@printf.net>

When a hex-digit > 'a' or 'A' is read, we have to add an offset of 10
to access the valid symbol in our mapping table.
Signed-off-by: Michael Heimpold <michael.heimpold@i2se.com>
Cc: Michael Heimpold <mhei@heimpold.de>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Chris Ball <chris@printf.net>

In case that we leave due to malformed string,
free the allocated memory before returning.
Signed-off-by: Michael Heimpold <michael.heimpold@i2se.com>
Cc: Michael Heimpold <mhei@heimpold.de>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Chris Ball <chris@printf.net>

If calloc fails, bail out immediately instead of trying to
use the NULL pointer.
Signed-off-by: Michael Heimpold <michael.heimpold@i2se.com>
Cc: Michael Heimpold <mhei@heimpold.de>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Chris Ball <chris@printf.net>

I got a compile error with GCC7. When trimming white spaces from strings
lsmmc uses strncpy with overlapping memory areas. This is not allowed.
In addition, the implementation was not efficient with calling strlen
and strncpy once per iteration. Refactor the code to be valid and more
effective.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Chris Ball <chris@printf.net>

This macro saves a few lines of code but is harder to read than the
equivalent code spelled out. IMHO the latter is more important, so
expand the macro everywhere and drop it.

While touching this also unbreak the strings used there for better
grepability.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Chris Ball <chris@printf.net>

The lsmmc tools contains an extensive parser of the CID, CSD, SCR
registers from userspace. The utility works as-is and uses sysfs
to read the register values.

The original code is created by Sebastian Rasmussen and still lives
in an attachment in the mail archive of linux-mmc. It need to be merged
into mmc-utils repository, which is convenient for testing MMC device
from userspace.

Change since v3:
 - Remove the unused EXT_CSD parser in lsmmc.c file.
Signed-off-by: Sebastian Rasmussen <sebras@gmail.com>
Signed-off-by: Chris Ball <chris@printf.net>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>