diff --git a/photon/libc/include/inttypes.h b/photon/libc/include/inttypes.h
new file mode 100644
index 0000000..2bd6bc8
--- /dev/null
+++ b/photon/libc/include/inttypes.h
@@ -0,0 +1,195 @@
+#ifndef INTTYPES_H__
+#define INTTYPES_H__
+
+#include <stdint.h>
+
+#define __PRI_8_LENGTH_MODIFIER__ "hh"
+#define __PRI_64_LENGTH_MODIFIER__ "ll"
+#define __SCN_64_LENGTH_MODIFIER__ "ll"
+#define __PRI_MAX_LENGTH_MODIFIER__ "j"
+#define __SCN_MAX_LENGTH_MODIFIER__ "j"
+
+#define PRId8         __PRI_8_LENGTH_MODIFIER__ "d"
+#define PRIi8         __PRI_8_LENGTH_MODIFIER__ "i"
+#define PRIo8         __PRI_8_LENGTH_MODIFIER__ "o"
+#define PRIu8         __PRI_8_LENGTH_MODIFIER__ "u"
+#define PRIx8         __PRI_8_LENGTH_MODIFIER__ "x"
+#define PRIX8         __PRI_8_LENGTH_MODIFIER__ "X"
+
+#define PRId16        "hd"
+#define PRIi16        "hi"
+#define PRIo16        "ho"
+#define PRIu16        "hu"
+#define PRIx16        "hx"
+#define PRIX16        "hX"
+
+#define PRId32        "d"
+#define PRIi32        "i"
+#define PRIo32        "o"
+#define PRIu32        "u"
+#define PRIx32        "x"
+#define PRIX32        "X"
+
+#define PRId64        __PRI_64_LENGTH_MODIFIER__ "d"
+#define PRIi64        __PRI_64_LENGTH_MODIFIER__ "i"
+#define PRIo64        __PRI_64_LENGTH_MODIFIER__ "o"
+#define PRIu64        __PRI_64_LENGTH_MODIFIER__ "u"
+#define PRIx64        __PRI_64_LENGTH_MODIFIER__ "x"
+#define PRIX64        __PRI_64_LENGTH_MODIFIER__ "X"
+
+#define PRIdLEAST8    PRId8
+#define PRIiLEAST8    PRIi8
+#define PRIoLEAST8    PRIo8
+#define PRIuLEAST8    PRIu8
+#define PRIxLEAST8    PRIx8
+#define PRIXLEAST8    PRIX8
+
+#define PRIdLEAST16   PRId16
+#define PRIiLEAST16   PRIi16
+#define PRIoLEAST16   PRIo16
+#define PRIuLEAST16   PRIu16
+#define PRIxLEAST16   PRIx16
+#define PRIXLEAST16   PRIX16
+
+#define PRIdLEAST32   PRId32
+#define PRIiLEAST32   PRIi32
+#define PRIoLEAST32   PRIo32
+#define PRIuLEAST32   PRIu32
+#define PRIxLEAST32   PRIx32
+#define PRIXLEAST32   PRIX32
+
+#define PRIdLEAST64   PRId64
+#define PRIiLEAST64   PRIi64
+#define PRIoLEAST64   PRIo64
+#define PRIuLEAST64   PRIu64
+#define PRIxLEAST64   PRIx64
+#define PRIXLEAST64   PRIX64
+
+#define PRIdFAST8     PRId8
+#define PRIiFAST8     PRIi8
+#define PRIoFAST8     PRIo8
+#define PRIuFAST8     PRIu8
+#define PRIxFAST8     PRIx8
+#define PRIXFAST8     PRIX8
+
+#define PRIdFAST16    PRId16
+#define PRIiFAST16    PRIi16
+#define PRIoFAST16    PRIo16
+#define PRIuFAST16    PRIu16
+#define PRIxFAST16    PRIx16
+#define PRIXFAST16    PRIX16
+
+#define PRIdFAST32    PRId32
+#define PRIiFAST32    PRIi32
+#define PRIoFAST32    PRIo32
+#define PRIuFAST32    PRIu32
+#define PRIxFAST32    PRIx32
+#define PRIXFAST32    PRIX32
+
+#define PRIdFAST64    PRId64
+#define PRIiFAST64    PRIi64
+#define PRIoFAST64    PRIo64
+#define PRIuFAST64    PRIu64
+#define PRIxFAST64    PRIx64
+#define PRIXFAST64    PRIX64
+
+/* int32_t is 'int', but intptr_t is 'long'.  */
+#define PRIdPTR       "ld"
+#define PRIiPTR       "li"
+#define PRIoPTR       "lo"
+#define PRIuPTR       "lu"
+#define PRIxPTR       "lx"
+#define PRIXPTR       "lX"
+
+#define PRIdMAX        __PRI_MAX_LENGTH_MODIFIER__ "d"
+#define PRIiMAX        __PRI_MAX_LENGTH_MODIFIER__ "i"
+#define PRIoMAX        __PRI_MAX_LENGTH_MODIFIER__ "o"
+#define PRIuMAX        __PRI_MAX_LENGTH_MODIFIER__ "u"
+#define PRIxMAX        __PRI_MAX_LENGTH_MODIFIER__ "x"
+#define PRIXMAX        __PRI_MAX_LENGTH_MODIFIER__ "X"
+
+#define SCNd8         __PRI_8_LENGTH_MODIFIER__ "d"
+#define SCNi8         __PRI_8_LENGTH_MODIFIER__ "i"
+#define SCNo8         __PRI_8_LENGTH_MODIFIER__ "o"
+#define SCNu8         __PRI_8_LENGTH_MODIFIER__ "u"
+#define SCNx8         __PRI_8_LENGTH_MODIFIER__ "x"
+
+#define SCNd16        "hd"
+#define SCNi16        "hi"
+#define SCNo16        "ho"
+#define SCNu16        "hu"
+#define SCNx16        "hx"
+
+#define SCNd32        "d"
+#define SCNi32        "i"
+#define SCNo32        "o"
+#define SCNu32        "u"
+#define SCNx32        "x"
+
+#define SCNd64        __SCN_64_LENGTH_MODIFIER__ "d"
+#define SCNi64        __SCN_64_LENGTH_MODIFIER__ "i"
+#define SCNo64        __SCN_64_LENGTH_MODIFIER__ "o"
+#define SCNu64        __SCN_64_LENGTH_MODIFIER__ "u"
+#define SCNx64        __SCN_64_LENGTH_MODIFIER__ "x"
+
+#define SCNdLEAST8    SCNd8
+#define SCNiLEAST8    SCNi8
+#define SCNoLEAST8    SCNo8
+#define SCNuLEAST8    SCNu8
+#define SCNxLEAST8    SCNx8
+
+#define SCNdLEAST16   SCNd16
+#define SCNiLEAST16   SCNi16
+#define SCNoLEAST16   SCNo16
+#define SCNuLEAST16   SCNu16
+#define SCNxLEAST16   SCNx16
+
+#define SCNdLEAST32   SCNd32
+#define SCNiLEAST32   SCNi32
+#define SCNoLEAST32   SCNo32
+#define SCNuLEAST32   SCNu32
+#define SCNxLEAST32   SCNx32
+
+#define SCNdLEAST64   SCNd64
+#define SCNiLEAST64   SCNi64
+#define SCNoLEAST64   SCNo64
+#define SCNuLEAST64   SCNu64
+#define SCNxLEAST64   SCNx64
+
+#define SCNdFAST8     SCNd8
+#define SCNiFAST8     SCNi8
+#define SCNoFAST8     SCNo8
+#define SCNuFAST8     SCNu8
+#define SCNxFAST8     SCNx8
+
+#define SCNdFAST16    SCNd16
+#define SCNiFAST16    SCNi16
+#define SCNoFAST16    SCNo16
+#define SCNuFAST16    SCNu16
+#define SCNxFAST16    SCNx16
+
+#define SCNdFAST32    SCNd32
+#define SCNiFAST32    SCNi32
+#define SCNoFAST32    SCNo32
+#define SCNuFAST32    SCNu32
+#define SCNxFAST32    SCNx32
+
+#define SCNdFAST64    SCNd64
+#define SCNiFAST64    SCNi64
+#define SCNoFAST64    SCNo64
+#define SCNuFAST64    SCNu64
+#define SCNxFAST64    SCNx64
+
+#define SCNdPTR       "ld"
+#define SCNiPTR       "li"
+#define SCNoPTR       "lo"
+#define SCNuPTR       "lu"
+#define SCNxPTR       "lx"
+
+#define SCNdMAX       __SCN_MAX_LENGTH_MODIFIER__ "d"
+#define SCNiMAX       __SCN_MAX_LENGTH_MODIFIER__ "i"
+#define SCNoMAX       __SCN_MAX_LENGTH_MODIFIER__ "o"
+#define SCNuMAX       __SCN_MAX_LENGTH_MODIFIER__ "u"
+#define SCNxMAX       __SCN_MAX_LENGTH_MODIFIER__ "x"
+
+#endif