LibC: Add printf and scanf format macros for "fast" and "least" types

As usual, we just define these based on the given integer size itself.

Userland/Libraries/LibC/inttypes.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2022, the SerenityOS developers.
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -26,6 +27,15 @@ __BEGIN_DECLS
 #define PRIdPTR __PRIPTR_PREFIX "d"
 #define PRIdMAX __PRI64_PREFIX "d"
 
+#define PRIdLEAST8 PRId8
+#define PRIdLEAST16 PRId16
+#define PRIdLEAST32 PRId32
+#define PRIdLEAST64 PRId64
+#define PRIdFAST8 PRId8
+#define PRIdFAST16 PRId16
+#define PRIdFAST32 PRId32
+#define PRIdFAST64 PRId64
+
 #define PRIi8 "d"
 #define PRIi16 "d"
 #define PRIi32 "d"
@@ -33,6 +43,15 @@ __BEGIN_DECLS
 #define PRIiPTR __PRIPTR_PREFIX "d"
 #define PRIiMAX __PRI64_PREFIX "d"
 
+#define PRIiLEAST8 PRIi8
+#define PRIiLEAST16 PRIi16
+#define PRIiLEAST32 PRIi32
+#define PRIiLEAST64 PRIi64
+#define PRIiFAST8 PRIi8
+#define PRIiFAST16 PRIi16
+#define PRIiFAST32 PRIi32
+#define PRIiFAST64 PRIi64
+
 #define PRIo8 "o"
 #define PRIo16 "o"
 #define PRIo32 "o"
@@ -40,6 +59,15 @@ __BEGIN_DECLS
 #define PRIoPTR __PRIPTR_PREFIX "o"
 #define PRIoMAX __PRI64_PREFIX "o"
 
+#define PRIoLEAST8 PRIo8
+#define PRIoLEAST16 PRIo16
+#define PRIoLEAST32 PRIo32
+#define PRIoLEAST64 PRIo64
+#define PRIoFAST8 PRIo8
+#define PRIoFAST16 PRIo16
+#define PRIoFAST32 PRIo32
+#define PRIoFAST64 PRIo64
+
 #define PRIu8 "u"
 #define PRIu16 "u"
 #define PRIu32 "u"
@@ -47,6 +75,15 @@ __BEGIN_DECLS
 #define PRIuPTR __PRIPTR_PREFIX "u"
 #define PRIuMAX __PRI64_PREFIX "u"
 
+#define PRIuLEAST8 PRIu8
+#define PRIuLEAST16 PRIu16
+#define PRIuLEAST32 PRIu32
+#define PRIuLEAST64 PRIu64
+#define PRIuFAST8 PRIu8
+#define PRIuFAST16 PRIu16
+#define PRIuFAST32 PRIu32
+#define PRIuFAST64 PRIu64
+
 #define PRIx8 "x"
 #define PRIx16 "x"
 #define PRIx32 "x"
@@ -54,6 +91,15 @@ __BEGIN_DECLS
 #define PRIxPTR __PRIPTR_PREFIX "x"
 #define PRIxMAX __PRI64_PREFIX "x"
 
+#define PRIxLEAST8 PRIx8
+#define PRIxLEAST16 PRIx16
+#define PRIxLEAST32 PRIx32
+#define PRIxLEAST64 PRIx64
+#define PRIxFAST8 PRIx8
+#define PRIxFAST16 PRIx16
+#define PRIxFAST32 PRIx32
+#define PRIxFAST64 PRIx64
+
 #define PRIX8 "X"
 #define PRIX16 "X"
 #define PRIX32 "X"
@@ -61,6 +107,15 @@ __BEGIN_DECLS
 #define PRIXPTR __PRIPTR_PREFIX "X"
 #define PRIXMAX __PRI64_PREFIX "X"
 
+#define PRIXLEAST8 PRIX8
+#define PRIXLEAST16 PRIX16
+#define PRIXLEAST32 PRIX32
+#define PRIXLEAST64 PRIX64
+#define PRIXFAST8 PRIX8
+#define PRIXFAST16 PRIX16
+#define PRIXFAST32 PRIX32
+#define PRIXFAST64 PRIX64
+
 #define SCNd8 "hhd"
 #define SCNd16 "hd"
 #define SCNd32 "ld"
@@ -68,6 +123,15 @@ __BEGIN_DECLS
 #define SCNdPTR __PRIPTR_PREFIX "d"
 #define SCNdMAX __PRI64_PREFIX "d"
 
+#define SCNdLEAST8 SCNd8
+#define SCNdLEAST16 SCNd16
+#define SCNdLEAST32 SCNd32
+#define SCNdLEAST64 SCNd64
+#define SCNdFAST8 SCNd8
+#define SCNdFAST16 SCNd16
+#define SCNdFAST32 SCNd32
+#define SCNdFAST64 SCNd64
+
 #define SCNi8 "hhi"
 #define SCNi16 "hi"
 #define SCNi32 "li"
@@ -75,6 +139,15 @@ __BEGIN_DECLS
 #define SCNiPTR __PRIPTR_PREFIX "i"
 #define SCNiMAX __PRI64_PREFIX "i"
 
+#define SCNiLEAST8 SCNi8
+#define SCNiLEAST16 SCNi16
+#define SCNiLEAST32 SCNi32
+#define SCNiLEAST64 SCNi64
+#define SCNiFAST8 SCNi8
+#define SCNiFAST16 SCNi16
+#define SCNiFAST32 SCNi32
+#define SCNiFAST64 SCNi64
+
 #define SCNu8 "hhu"
 #define SCNu16 "hu"
 #define SCNu32 "lu"
@@ -82,6 +155,15 @@ __BEGIN_DECLS
 #define SCNuPTR __PRIPTR_PREFIX "u"
 #define SCNuMAX __PRI64_PREFIX "u"
 
+#define SCNuLEAST8 SCNu8
+#define SCNuLEAST16 SCNu16
+#define SCNuLEAST32 SCNu32
+#define SCNuLEAST64 SCNu64
+#define SCNuFAST8 SCNu8
+#define SCNuFAST16 SCNu16
+#define SCNuFAST32 SCNu32
+#define SCNuFAST64 SCNu64
+
 #define SCNo8 "hho"
 #define SCNo16 "ho"
 #define SCNo32 "lo"
@@ -89,6 +171,15 @@ __BEGIN_DECLS
 #define SCNoPTR __PRIPTR_PREFIX "o"
 #define SCNoMAX __PRI64_PREFIX "o"
 
+#define SCNoLEAST8 SCNo8
+#define SCNoLEAST16 SCNo16
+#define SCNoLEAST32 SCNo32
+#define SCNoLEAST64 SCNo64
+#define SCNoFAST8 SCNo8
+#define SCNoFAST16 SCNo16
+#define SCNoFAST32 SCNo32
+#define SCNoFAST64 SCNo64
+
 #define SCNx8 "hhx"
 #define SCNx16 "hx"
 #define SCNx32 "lx"
@@ -96,6 +187,15 @@ __BEGIN_DECLS
 #define SCNxPTR __PRIPTR_PREFIX "x"
 #define SCNxMAX __PRI64_PREFIX "x"
 
+#define SCNxLEAST8 SCNx8
+#define SCNxLEAST16 SCNx16
+#define SCNxLEAST32 SCNx32
+#define SCNxLEAST64 SCNx64
+#define SCNxFAST8 SCNx8
+#define SCNxFAST16 SCNx16
+#define SCNxFAST32 SCNx32
+#define SCNxFAST64 SCNx64
+
 typedef struct imaxdiv_t {
     intmax_t quot;
     intmax_t rem;