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Subject[PATCH] vsprintf and docs: Add X to %ph for upper case output
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Uppercase hex output of small char arrays is moderately frequently used.
Add a mechanism to support the %*ph output as uppercase using 'X'.

Signed-off-by: Joe Perches <joe@perches.com>
---
Documentation/core-api/printk-formats.rst | 7 ++++-
lib/vsprintf.c | 48 ++++++++++++++++++++-----------
2 files changed, 37 insertions(+), 18 deletions(-)

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index e08bbe9b0cbf3..01944b0c8adf3 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -285,12 +285,17 @@ Raw buffer as a hex string
::

%*ph 00 01 02 ... 3f
+ %*phX 00 01 02 ... 3F
%*phC 00:01:02: ... :3f
+ %*phCX 00:01:02: ... :3F
%*phD 00-01-02- ... -3f
+ %*phDX 00-01-02- ... -3F
%*phN 000102 ... 3f
+ %*phNX 000102 ... 3F

For printing small buffers (up to 64 bytes long) as a hex string with a
-certain separator. For larger buffers consider using
+certain separator. Typical output is lowercase, formats with X are uppercase.
+For larger buffers consider using
:c:func:`print_hex_dump`.

MAC/FDDI addresses
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 134216c45980e..6aca95d5a99f0 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1147,7 +1147,10 @@ char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
{
int i, len = 1; /* if we pass '%ph[CDN]', field width remains
negative value, fallback to the default */
- char separator;
+ char separator = ' ';
+ int count = 1;
+ bool found = true;
+ bool ucase = false;

if (spec.field_width == 0)
/* nothing to print */
@@ -1156,30 +1159,41 @@ char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
if (check_pointer(&buf, end, addr, spec))
return buf;

- switch (fmt[1]) {
- case 'C':
- separator = ':';
- break;
- case 'D':
- separator = '-';
- break;
- case 'N':
- separator = 0;
- break;
- default:
- separator = ' ';
- break;
- }
+ do {
+ switch (fmt[count++]) {
+ case 'C':
+ separator = ':';
+ break;
+ case 'D':
+ separator = '-';
+ break;
+ case 'N':
+ separator = 0;
+ break;
+ case 'X':
+ ucase = true;
+ break;
+ default:
+ found = false;
+ break;
+ }
+ } while (found);

if (spec.field_width > 0)
len = min_t(int, spec.field_width, 64);

for (i = 0; i < len; ++i) {
- if (buf < end)
+ if (buf < end) {
*buf = hex_asc_hi(addr[i]);
+ if (ucase)
+ *buf = toupper(*buf);
+ }
++buf;
- if (buf < end)
+ if (buf < end) {
*buf = hex_asc_lo(addr[i]);
+ if (ucase)
+ *buf = toupper(*buf);
+ }
++buf;

if (separator && i != len - 1) {

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