endian.h

完整的Bell实验室的嵌入式文件系统TFS

/* endian.h:
 *  macros used for endian conversion.
 *  The intent is that the macros have nil effect on Big_Endian
 *  systems...
 *  ecs:    endian-convert short
 *  ecl:    endian-convert long
 */
#ifdef CPU_LE
#define ecs(a) (((a & 0x00ff) << 8) | ((a & 0xff00) >> 8))
#define ecl(a) (((a & 0x000000ff) << 24) | ((a & 0x0000ff00) << 8) | \
          ((a & 0x00ff0000) >> 8) | ((a & 0xff000000) >> 24))
#define self_ecs(a) (a = ecs(a))
#define self_ecl(a) (a = ecl(a))
#else
#define ecs(a)  a
#define ecl(a)  a
#define self_ecs(a)
#define self_ecl(a)
#endif