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Subject[PATCH 1/9] lib/vsprintf.c: Add %pU to print UUID/GUIDs
Date
UUID/GUIDs are somewhat common in kernel source.

Standardize the printed style of UUID/GUIDs by using
another extension to %p.

%pU: 01020304-0506-0708-090a-0b0c0d0e0f10
%pUr: 04030201-0605-0807-090a-0b0c0d0e0f10
%pU[r]X:Use upper case hex

Signed-off-by: Joe Perches <joe@perches.com>
---
lib/vsprintf.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 57 insertions(+), 1 deletions(-)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index b91839e..68a49bb 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -790,6 +790,53 @@ static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
return string(buf, end, ip4_addr, spec);
}

+static char *uuid_string(char *buf, char *end, const u8 *addr,
+ struct printf_spec spec, const char *fmt)
+{
+ char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
+ char *p = uuid;
+ int i;
+ static const u8 r[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
+ static const u8 n[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
+ const u8 *index = n;
+ bool uc = false;
+
+ while (isalnum(*(++fmt))) {
+ switch (*fmt) {
+ case 'r':
+ index = r;
+ break;
+ case 'X':
+ uc = true;
+ break;
+ }
+ }
+
+ for (i = 0; i < 16; i++) {
+ p = pack_hex_byte(p, addr[index[i]]);
+ switch (i) {
+ case 3:
+ case 5:
+ case 7:
+ case 9:
+ *p++ = '-';
+ break;
+ }
+ }
+
+ *p = 0;
+
+ if (uc) {
+ p = uuid;
+ while (*p) {
+ *p = toupper(*p);
+ p++;
+ }
+ }
+
+ return string(buf, end, uuid, spec);
+}
+
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed
* by an extra set of alphanumeric characters that are extended format
@@ -814,6 +861,13 @@ static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
* IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
* - 'I6c' for IPv6 addresses printed as specified by
* http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt
+ * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
+ * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+ * Options for %pU are:
+ * 'X' use upper case hex digits
+ * 'r' use LE byte order for U32 and U16s equivalents. Use indices:
+ * [3][2][1][0]-[5][4]-[7][6]-[9][8]-[10]...[15]
+ *
* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
* function pointers are really function descriptors, which contain a
* pointer to the real address.
@@ -828,9 +882,9 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
case 'F':
case 'f':
ptr = dereference_function_descriptor(ptr);
- case 's':
/* Fallthrough */
case 'S':
+ case 's':
return symbol_string(buf, end, ptr, spec, *fmt);
case 'R':
return resource_string(buf, end, ptr, spec);
@@ -853,6 +907,8 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
return ip4_addr_string(buf, end, ptr, spec, fmt);
}
break;
+ case 'U':
+ return uuid_string(buf, end, ptr, spec, fmt);
}
spec.flags |= SMALL;
if (spec.field_width == -1) {
--
1.6.3.1.10.g659a0.dirty


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