diff options
Diffstat (limited to 'xorg-server/include/misc.h')
| -rw-r--r-- | xorg-server/include/misc.h | 100 |
1 files changed, 70 insertions, 30 deletions
diff --git a/xorg-server/include/misc.h b/xorg-server/include/misc.h index f0c92abeb..f437ef451 100644 --- a/xorg-server/include/misc.h +++ b/xorg-server/include/misc.h @@ -127,13 +127,19 @@ typedef struct _xReq *xReqPtr; /* byte swap a 32-bit literal */ -#define lswapl(x) ((((x) & 0xff) << 24) |\ - (((x) & 0xff00) << 8) |\ - (((x) & 0xff0000) >> 8) |\ - (((x) >> 24) & 0xff)) +static inline uint32_t lswapl(uint32_t x) +{ + return ((x & 0xff) << 24) | + ((x & 0xff00) << 8) | + ((x & 0xff0000) >> 8) | + ((x >> 24) & 0xff); +} -/* byte swap a short literal */ -#define lswaps(x) ((((x) & 0xff) << 8) | (((x) >> 8) & 0xff)) +/* byte swap a 16-bit literal */ +static inline uint16_t lswaps(uint16_t x) +{ + return ((x & 0xff) << 8) | ((x >> 8) & 0xff); +} #undef min #undef max @@ -144,9 +150,6 @@ typedef struct _xReq *xReqPtr; * it in case we haven't done that yet. */ #include <stdlib.h> -#ifndef Fabs -#define Fabs(a) ((a) > 0.0 ? (a) : -(a)) /* floating absolute value */ -#endif #define sign(x) ((x) < 0 ? -1 : ((x) > 0 ? 1 : 0)) /* this assumes b > 0 */ #define modulus(a, b, d) if (((d) = (a) % (b)) < 0) (d) += (b) @@ -263,32 +266,69 @@ version_compare(uint16_t a_major, uint16_t a_minor, #define SwapRestL(stuff) \ SwapLongs((CARD32 *)(stuff + 1), LengthRestL(stuff)) +#ifdef __GNUC__ +void __attribute__((error("wrong sized variable passed to swap"))) wrong_size(void); +#else +static inline void wrong_size(void) +{ +} + +static inline void __builtin_constant_p(int x) +{ + return 0; +} +#endif + /* byte swap a 32-bit value */ -#define swapl(x, n) { \ - n = ((char *) (x))[0];\ - ((char *) (x))[0] = ((char *) (x))[3];\ - ((char *) (x))[3] = n;\ - n = ((char *) (x))[1];\ - ((char *) (x))[1] = ((char *) (x))[2];\ - ((char *) (x))[2] = n; } - -/* byte swap a short */ -#define swaps(x, n) { \ - n = ((char *) (x))[0];\ - ((char *) (x))[0] = ((char *) (x))[1];\ - ((char *) (x))[1] = n; } +static inline void swap_uint32(uint32_t *x) +{ + char n = ((char *) &x)[0]; + ((char *) x)[0] = ((char *) x)[3]; + ((char *) x)[3] = n; + n = ((char *) x)[1]; + ((char *) x)[1] = ((char *) x)[2]; + ((char *) x)[2] = n; +} + +#define swapl(x) do { \ + if (sizeof(*(x)) != 4) \ + wrong_size(); \ + if (__builtin_constant_p((uintptr_t)(x) & 3) && ((uintptr_t)(x) & 3) == 0) \ + *(x) = lswapl(*(x)); \ + else \ + swap_uint32((uint32_t *)(x)); \ + } while (0) + +/* byte swap a 16-bit value */ +static inline void swap_uint16(uint16_t *x) +{ + char n = ((char *) x)[0]; + ((char *) x)[0] = ((char *) x)[1]; + ((char *) x)[1] = n; +} + +#define swaps(x) do { \ + if (sizeof(*(x)) != 2) \ + wrong_size(); \ + if (__builtin_constant_p((uintptr_t)(x) & 1) && ((uintptr_t)(x) & 1) == 0) \ + *(x) = lswaps(*(x)); \ + else \ + swap_uint16((uint16_t *)(x)); \ + } while (0) /* copy 32-bit value from src to dst byteswapping on the way */ -#define cpswapl(src, dst) { \ - ((char *)&(dst))[0] = ((char *) &(src))[3];\ - ((char *)&(dst))[1] = ((char *) &(src))[2];\ - ((char *)&(dst))[2] = ((char *) &(src))[1];\ - ((char *)&(dst))[3] = ((char *) &(src))[0]; } +#define cpswapl(src, dst) do { \ + if (sizeof((src)) != 4 || sizeof((dst)) != 4) \ + wrong_size(); \ + (dst) = lswapl((src)); \ + } while (0) /* copy short from src to dst byteswapping on the way */ -#define cpswaps(src, dst) { \ - ((char *) &(dst))[0] = ((char *) &(src))[1];\ - ((char *) &(dst))[1] = ((char *) &(src))[0]; } +#define cpswaps(src, dst) do { \ + if (sizeof((src)) != 2 || sizeof((dst)) != 2) \ + wrong_size(); \ + (dst) = lswaps((src)); \ + } while (0) extern _X_EXPORT void SwapLongs( CARD32 *list, |