Re: [PATCH 1/5] vsprintf/Documentation: Add X to %*ph extension to output upper case hex
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: 2021-08-27 07:48:47
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On Thu, Aug 26, 2021 at 11:43:01AM -0700, Joe Perches wrote:
A few sysfs output uses of hex arrays are uppercase and are nominally ABI. Add a mechanism to the existing vsprintf %*ph hex output extension to support upper case hex output.
...
+ The preferred output is lowercase %*ph 00 01 02 ... 3f %*phC 00:01:02: ... :3f %*phD 00-01-02- ... -3f %*phN 000102 ... 3f + Formats with X are uppercase, used for backwards compatibility + %*phX 00 01 02 ... 3F + %*phCX 00:01:02: ... :3F + %*phDX 00-01-02- ... -3F + %*phNX 000102 ... 3F
Why not using %*pH...? ...
+ char locase = 0x20; /* ASCII OR'd for lower case see: number() */
If you use h vs H, you may derive this from (fmt[...] & SMALL). -- With Best Regards, Andy Shevchenko