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#ifndef UTILS_H
#define UTILS_H
#include <stdint.h>
#define ABS(x) (((x) < 0) ? -(x) : (x))
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#define BOUND(x,a,b) ( MIN(b, MAX(a, x)) )
static inline void breakpoint(void);
#pragma aux breakpoint = 0xcd 0x03;
static inline void cli(void);
#pragma aux cli = "cli"
static inline void sti(void);
#pragma aux sti = "sti"
/** Map x linearly from range [0, srcmax] to [0, dstmax].
* Equivalent of (x * dstmax) / srcmax but with 32-bit unsigned precision. */
static unsigned scaleu(unsigned x, unsigned srcmax, unsigned dstmax);
#pragma aux scaleu = \
"mul cx" /* dx:ax = x * dstmax */\
"div bx" /* ax = dx:ax / srcmax */\
__parm [ax] [bx] [cx] \
__value [ax] \
__modify [ax dx]
/** Map x linearly from range [0, srcmax] to [0, dstmax].
* Equivalent of (x * dstmax) / srcmax but with 32-bit signed precision. */
static int scalei(int x, int srcmax, int dstmax);
#pragma aux scalei = \
"imul cx" /* dx:ax = x * dstmax */ \
"idiv bx" /* ax = dx:ax / srcmax */ \
__parm [ax] [bx] [cx] \
__value [ax] \
__modify [ax dx]
/** Map x linearly from range [0, srcmax] to [0, dstmax].
* Equivalent of (x * dstmax) / srcmax but with 32-bit signed precision.
* Division remainder is returned in rem, which should be reused
* in future calls to reduce rounding error. */
static int scalei_rem(int x, int srcmax, int dstmax, short *rem);
#pragma aux scalei_rem = \
"imul cx" /* dx:ax = x * dstmax */ \
"mov cx, [si]" /* cx = rem */ \
"test cx, cx" \
"setns cl" /* cl = 1 if rem positive, 0 if negative */ \
"movzx cx, cl" \
"dec cx" /* cx = 0 if rem positive, -1 if negative */ \
"add ax, [si]" /* ax += *rem */ \
"adc dx, cx" /* dx += 1 if carry and rem positive, 0 if carry and rem negative (aka. signed addition) */ \
"idiv bx" /* ax = dx:ax / srcmax, dx = new remainder */ \
"mov [si], dx" /* store the new remainder */ \
__parm [ax] [bx] [cx] [si] \
__value [ax] \
__modify [ax cx dx si]
static void bzero(void __far *buf, unsigned int size);
#pragma aux bzero = \
"cld" \
"mov ax, 0" \
"rep stos byte ptr es:[di]" \
__parm [es di] [cx] \
__modify [ax]
static void nfmemcpy(void __far *dst, const void *src, unsigned int size);
#pragma aux nfmemcpy = \
"cld" \
"rep movs byte ptr es:[di], byte ptr ds:[si]" \
__parm [es di] [si] [cx] \
__modify [cx si di]
static void fnmemcpy(void *dst, const void __far *src, unsigned int size);
#pragma aux fnmemcpy = \
"cld" \
"push gs" \
"mov ax, es" \
"mov gs, ax" /* gs is now the src segment */ \
"mov ax, ds" \
"mov es, ax" /* es is now ds, the dst segment */ \
"rep movs byte ptr es:[di], byte ptr gs:[si]" \
"pop gs" \
__parm [di] [es si] [cx] \
__modify [ax cx si di es]
static void ffmemcpy(void __far *dst, const void __far *src, unsigned int size);
#pragma aux ffmemcpy = \
"cld" \
"push gs" \
"mov gs, ax" \
"rep movs byte ptr es:[di], byte ptr gs:[si]" \
"pop gs" \
__parm [es di] [gs si] [cx] \
__modify [cx si di]
static void nnmemcpy(void *dst, const void *src, unsigned int size);
#pragma aux nnmemcpy = \
"cld" \
"mov ax, ds" \
"mov es, ax" /* es is now ds, the src+dst segment */ \
"rep movs byte ptr es:[di], byte ptr ds:[si]" \
__parm [di] [si] [cx] \
__modify [cx si di es]
#endif
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