%z is used in standard C99 as the printf specifier for size_t types.
Add support for it so we can portably print UINTN.

Cc: Michael D Kinney <[email protected]>
Cc: Liming Gao <[email protected]>
Cc: Zhiguang Liu <[email protected]>
Signed-off-by: Pedro Falcato <[email protected]>
---
 MdePkg/Library/BasePrintLib/PrintLibInternal.c | 9 +++++++++
 MdePkg/Library/BasePrintLib/PrintLibInternal.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/MdePkg/Library/BasePrintLib/PrintLibInternal.c 
b/MdePkg/Library/BasePrintLib/PrintLibInternal.c
index 42b598a432..1cd99b2213 100644
--- a/MdePkg/Library/BasePrintLib/PrintLibInternal.c
+++ b/MdePkg/Library/BasePrintLib/PrintLibInternal.c
@@ -720,6 +720,9 @@ BasePrintLibSPrintMarker (
             case 'l':
               Flags |= LONG_TYPE;
               break;
+            case 'z':
+              Flags |= SIZET_TYPE;
+              break;
             case '*':
               if ((Flags & PRECISION) == 0) {
                 Flags |= PAD_TO_WIDTH;
@@ -833,6 +836,12 @@ BasePrintLibSPrintMarker (
               } else {
                 Value = BASE_ARG (BaseListMarker, int);
               }
+            } else if ((Flags & SIZET_TYPE) != 0) {
+              if (BaseListMarker == NULL) {
+                Value = VA_ARG (VaListMarker, UINTN);
+              } else {
+                Value = BASE_ARG (BaseListMarker, UINTN);
+              }
             } else {
               if (BaseListMarker == NULL) {
                 Value = VA_ARG (VaListMarker, INT64);
diff --git a/MdePkg/Library/BasePrintLib/PrintLibInternal.h 
b/MdePkg/Library/BasePrintLib/PrintLibInternal.h
index 34d591c6fc..9193e6192b 100644
--- a/MdePkg/Library/BasePrintLib/PrintLibInternal.h
+++ b/MdePkg/Library/BasePrintLib/PrintLibInternal.h
@@ -29,6 +29,7 @@
 #define ARGUMENT_REVERSED    BIT12
 #define COUNT_ONLY_NO_PRINT  BIT13
 #define UNSIGNED_TYPE        BIT14
+#define SIZET_TYPE           BIT15
 
 //
 // Record date and time information
-- 
2.37.0



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