libc.h

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// a libc replacement (more or less) for the Microsoft Visual C compiler
// this file is public domain -- do with it whatever you want!
#ifndef __LIBC_H_INCLUDED__
#define __LIBC_H_INCLUDED__
 
// check if minilibc is required
#ifndef NEED_MINILIBC
#ifndef NOLIBC
#define NEED_MINILIBC 0
#else
#define NEED_MINILIBC 1
#endif
#endif
 
#ifdef _MSC_VER
#define INLINE __forceinline
#define FASTCALL __fastcall
#ifdef NOLIBC
#ifdef MAIN_PROGRAM
int _fltused = 0;
#endif
#endif
#else
#define INLINE inline
#define FASTCALL __attribute__((fastcall))
#include <stdint.h>
#endif
 
#undef WIN32
#undef _WIN32
 
#ifdef _WIN32
#ifndef WIN32
#define WIN32
#endif
#endif
#ifdef WIN32
#include <windows.h>
#endif
 
#if !NEED_MINILIBC
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif
#include <math.h>
 
#undef _MSC_VER
 
#ifdef _NO_STDINT
#ifndef __int8_t_defined
#define __int8_t_defined
typedef unsigned char  uint8_t;
typedef   signed char   int8_t;
typedef unsigned short uint16_t;
typedef   signed short  int16_t;
typedef unsigned int   uint32_t;
typedef   signed int    int32_t;
#ifdef _MSC_VER
typedef unsigned __int64 uint64_t;
typedef   signed __int64  int64_t;
#else
typedef unsigned long long uint64_t;
typedef   signed long long  int64_t;
#endif
#endif
#endif
 
 
#ifndef NULL
#define NULL 0
#endif
 
#ifndef M_PI
#define M_PI 3.14159265358979
#endif
 
 
#if NEED_MINILIBC 
 
static INLINE void libc_memset(void *dest, int value, int count) {
    if (!count) return;
    __asm {
        cld
            mov edi, dest
            mov eax, value
            mov ecx, count
            rep stosb
    }
}
 
static INLINE void libc_memcpy(void *dest, const void *src, int count) {
    if (!count) return;
    __asm {
        cld
            mov esi, src
            mov edi, dest
            mov ecx, count
            rep movsb
    }
}
 
#define libc_memmove libc_memcpy
 
static INLINE void* libc_malloc(int size) {
    return (void*)LocalAlloc(LMEM_FIXED, size);
}
 
static INLINE void* libc_calloc(int size, int nmemb) {
    return (void*)LocalAlloc(LMEM_FIXED | LMEM_ZEROINIT, size * nmemb);
}
 
static INLINE void* libc_realloc(void* old, int size) {
    int oldsize = (int)LocalSize((HLOCAL)old);
    void *mem;
    if (size <= oldsize) return old;
    mem = LocalAlloc(LMEM_FIXED, size);
    libc_memcpy(mem, old, oldsize);
    LocalFree((HLOCAL)old);
    return mem;
}
 
static INLINE void libc_free(void *mem) {
    LocalFree((HLOCAL)mem);
}
 
static INLINE double libc_frexp(double x, int *e) {
    double res = -9999.999;
    unsigned __int64 i = *(unsigned __int64*)(&x);
    if (!(i & 0x7F00000000000000UL)) {
        *e = 0;
        return x;
    }
    *e = ((i << 1) >> 53) - 1022;
    i &= 0x800FFFFFFFFFFFFFUL;
    i |= 0x3FF0000000000000UL;
    return *(double*)(&i) * 0.5;
}
 
static INLINE double __declspec(naked) libc_exp(double x) {
    __asm {
        fldl2e
            fld qword ptr[esp + 4]
            fmul
            fst st(1)
            frndint
            fxch
            fsub st(0), st(1)
            f2xm1
            fld1
            fadd
            fscale
            ret
    }
}
 
 
static INLINE double __declspec(naked) libc_pow(double b, double e) {
    __asm {
        fld qword ptr[esp + 12]
            fld qword ptr[esp + 4]
            fyl2x
            // following is a copy of libc_exp:
            fst st(1)
            frndint
            fxch
            fsub st(0), st(1)
            f2xm1
            fld1
            fadd
            fscale
            ret
    }
}
 
 
 
#else // NEED_MINILIBC == 0
 
#define libc_malloc  malloc
#define libc_calloc  calloc
#define libc_realloc realloc
#define libc_free    free
 
#define libc_memset  memset
#define libc_memcpy  memcpy
#define libc_memmove memmove
 
#define libc_frexp   frexp
#define libc_exp     exp
#define libc_pow     pow
 
#endif // NEED_MINILIBC
 
#endif//__LIBC_H_INCLUDED__