Added min/max macros for the sized SDL datatypes

libsdl-org · Oct 16, 2017 · a225ffc · a225ffc
1 parent 8e98bda
commit a225ffc
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Showing 2 changed files with 36 additions and 0 deletions.
diff --git a/include/SDL_stdinc.h b/include/SDL_stdinc.h
@@ -146,35 +146,51 @@ typedef enum
 /**
  * \brief A signed 8-bit integer type.
  */
+#define SDL_MAX_SINT8   ((Sint8)0x7F)           /* 127 */
+#define SDL_MIN_SINT8   ((Sint8)(~0x7F))        /* -128 */
 typedef int8_t Sint8;
 /**
  * \brief An unsigned 8-bit integer type.
  */
+#define SDL_MAX_UINT8   ((Uint8)0xFF)           /* 255 */
+#define SDL_MIN_UINT8   ((Uint8)0x00)           /* 0 */
 typedef uint8_t Uint8;
 /**
  * \brief A signed 16-bit integer type.
  */
+#define SDL_MAX_SINT16  ((Sint16)0x7FFF)        /* 32767 */
+#define SDL_MIN_SINT16  ((Sint16)(~0x7FFF))     /* -32768 */
 typedef int16_t Sint16;
 /**
  * \brief An unsigned 16-bit integer type.
  */
+#define SDL_MAX_UINT16  ((Uint16)0xFFFF)        /* 65535 */
+#define SDL_MIN_UINT16  ((Uint16)0x0000)        /* 0 */
 typedef uint16_t Uint16;
 /**
  * \brief A signed 32-bit integer type.
  */
+#define SDL_MAX_SINT32  ((Sint32)0x7FFFFFFF)    /* 2147483647 */
+#define SDL_MIN_SINT32  ((Sint32)(~0x7FFFFFFF)) /* -2147483648 */
 typedef int32_t Sint32;
 /**
  * \brief An unsigned 32-bit integer type.
  */
+#define SDL_MAX_UINT32  ((Uint32)0xFFFFFFFFu)   /* 4294967295 */
+#define SDL_MIN_UINT32  ((Uint32)0x00000000)    /* 0 */
 typedef uint32_t Uint32;
 
 /**
  * \brief A signed 64-bit integer type.
  */
+#define SDL_MAX_SINT64  ((Sint64)0x7FFFFFFFFFFFFFFFll)      /* 9223372036854775807 */
+#define SDL_MIN_SINT64  ((Sint64)(~0x7FFFFFFFFFFFFFFFll))   /* -9223372036854775808 */
 typedef int64_t Sint64;
 /**
  * \brief An unsigned 64-bit integer type.
  */
+#define SDL_MAX_UINT64  ((Uint64)0xFFFFFFFFFFFFFFFFull)     /* 18446744073709551615 */
+#define SDL_MIN_UINT64  ((Uint64)(0x0000000000000000ull))   /* 0 */
 typedef uint64_t Uint64;
 
 /* @} *//* Basic data types */

diff --git a/test/testplatform.c b/test/testplatform.c
@@ -30,6 +30,26 @@ TestTypes(SDL_bool verbose)
 {
     int error = 0;
 
+	SDL_COMPILE_TIME_ASSERT(SDL_MAX_SINT8, SDL_MAX_SINT8 == 127);
+	SDL_COMPILE_TIME_ASSERT(SDL_MIN_SINT8, SDL_MIN_SINT8 == -128);
+	SDL_COMPILE_TIME_ASSERT(SDL_MAX_UINT8, SDL_MAX_UINT8 == 255);
+	SDL_COMPILE_TIME_ASSERT(SDL_MIN_UINT8, SDL_MIN_UINT8 == 0);
+
+	SDL_COMPILE_TIME_ASSERT(SDL_MAX_SINT16, SDL_MAX_SINT16 == 32767);
+	SDL_COMPILE_TIME_ASSERT(SDL_MIN_SINT16, SDL_MIN_SINT16 == -32768);
+	SDL_COMPILE_TIME_ASSERT(SDL_MAX_UINT16, SDL_MAX_UINT16 == 65535);
+	SDL_COMPILE_TIME_ASSERT(SDL_MIN_UINT16, SDL_MIN_UINT16 == 0);
+
+	SDL_COMPILE_TIME_ASSERT(SDL_MAX_SINT32, SDL_MAX_SINT32 == 2147483647);
+	SDL_COMPILE_TIME_ASSERT(SDL_MIN_SINT32, SDL_MIN_SINT32 == ~0x7fffffff); /* Instead of -2147483648, which is treated as unsigned by some compilers */
+	SDL_COMPILE_TIME_ASSERT(SDL_MAX_UINT32, SDL_MAX_UINT32 == 4294967295u);
+	SDL_COMPILE_TIME_ASSERT(SDL_MIN_UINT32, SDL_MIN_UINT32 == 0);
+
+	SDL_COMPILE_TIME_ASSERT(SDL_MAX_SINT64, SDL_MAX_SINT64 == 9223372036854775807ll);
+	SDL_COMPILE_TIME_ASSERT(SDL_MIN_SINT64, SDL_MIN_SINT64 == ~0x7fffffffffffffffll); /* Instead of -9223372036854775808, which is treated as unsigned by compilers */
+	SDL_COMPILE_TIME_ASSERT(SDL_MAX_UINT64, SDL_MAX_UINT64 == 18446744073709551615ull);
+	SDL_COMPILE_TIME_ASSERT(SDL_MIN_UINT64, SDL_MIN_UINT64 == 0);
+
     if (badsize(sizeof(Uint8), 1)) {
         if (verbose)
             SDL_Log("sizeof(Uint8) != 1, instead = %u\n",