[U-Boot] [U-Boot, v3, 1/4] Kconfig: Enable usage of escape char '\' in string values

[Stefan Roese <sr@denx.de>]

On 27.05.2015 23:58, Tom Rini wrote:
> On Mon, May 18, 2015 at 02:08:21PM +0200, Stefan Roese wrote:
>
>> I might have missed something, but I failed to use the escape char '\'
>> in strings. To pass a printf format string like "foo %d bar\n" via
>> Kconfig to the code.
>>
>> Right now its not possible to use the escape character '\' in Kconfig
>> string values correctly to e.g. set this string value "test output\n".
>> The '\n' will be converted to 'n'.
>>
>> The current implementation removes some of the '\' chars from the input
>> string in conf_set_sym_val(). Examples:
>>
>> '\'	-> ''
>> '\\'	-> '\'
>> '\\\'	-> '\'
>> '\\\\'	-> '\\'
>> ...
>>
>> And then doubles the backslash chars in the output string in
>> sym_escape_string_value(). Example:
>>
>> '\'	-> ''	-> ''
>> '\\'	-> '\'	-> '\\'
>> '\\\'	-> '\'	-> '\\'
>> '\\\\'	-> '\\'	-> '\\\\'
>> ...
>>
>> As you see in these examples, its impossible to generate a single '\'
>> charater in the output string as its needed for something like '\n'.
>>
>> This patch now changes this behavior to not drop some backslashes in
>> conf_set_sym_val() and to not add new backslashes in the resulting
>> output string. Removing the function sym_escape_string_value()
>> completely as its not needed anymore.
>>
>> Signed-off-by: Stefan Roese <sr@denx.de>
>> Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
>> Cc: Simon Glass <sjg@chromium.org>
>> Reviewed-by: Simon Glass <sjg@chromium.org>
>
> This breaks a number of configs such as TZX-Q8-713B7_defconfig:
> *** Error in `scripts/kconfig/conf': free(): invalid next size (fast):
> 0x0000000002972420 ***
> ../scripts/kconfig/Makefile:111: recipe for target 'TZX-Q8-713B7_defconfig' failed

Hmmm. I've not seen this error while running buildman for all ARM 
boards. Sorry about that. I'll work on a new version later today.

Thanks,
Stefan