mirror of
https://github.com/QB64Official/qb64.git
synced 2024-09-04 11:10:15 +00:00
184 lines
3.9 KiB
C
184 lines
3.9 KiB
C
// a libc replacement (more or less) for the Microsoft Visual C compiler
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// this file is public domain -- do with it whatever you want!
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#ifndef __LIBC_H_INCLUDED__
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#define __LIBC_H_INCLUDED__
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// check if minilibc is required
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#ifndef NEED_MINILIBC
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#ifndef NOLIBC
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#define NEED_MINILIBC 0
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#else
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#define NEED_MINILIBC 1
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#endif
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#endif
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#ifdef _MSC_VER
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#define INLINE __forceinline
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#define FASTCALL __fastcall
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#ifdef NOLIBC
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#ifdef MAIN_PROGRAM
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int _fltused=0;
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#endif
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#endif
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#else
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#define INLINE inline
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#define FASTCALL __attribute__((fastcall))
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#include <stdint.h>
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#endif
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#ifdef _WIN32
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#ifndef WIN32
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#define WIN32
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#endif
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#endif
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#ifdef WIN32
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#include <windows.h>
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#endif
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#if !NEED_MINILIBC
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#endif
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#include <math.h>
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#ifndef __int8_t_defined
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#define __int8_t_defined
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typedef unsigned char uint8_t;
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typedef signed char int8_t;
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typedef unsigned short uint16_t;
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typedef signed short int16_t;
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typedef unsigned int uint32_t;
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typedef signed int int32_t;
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#ifdef _MSC_VER
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typedef unsigned __int64 uint64_t;
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typedef signed __int64 int64_t;
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#else
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typedef unsigned long long uint64_t;
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typedef signed long long int64_t;
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#endif
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#endif
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#ifndef NULL
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#define NULL 0
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#endif
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#ifndef M_PI
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#define M_PI 3.14159265358979
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#endif
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///////////////////////////////////////////////////////////////////////////////
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#if NEED_MINILIBC
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static INLINE void libc_memset(void *dest, int value, int count) {
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if (!count) return;
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__asm {
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cld
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mov edi, dest
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mov eax, value
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mov ecx, count
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rep stosb
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}
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}
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static INLINE void libc_memcpy(void *dest, const void *src, int count) {
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if (!count) return;
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__asm {
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cld
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mov esi, src
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mov edi, dest
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mov ecx, count
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rep movsb
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}
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}
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#define libc_memmove libc_memcpy
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static INLINE void* libc_malloc(int size) {
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return (void*) LocalAlloc(LMEM_FIXED, size);
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}
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static INLINE void* libc_calloc(int size, int nmemb) {
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return (void*) LocalAlloc(LMEM_FIXED | LMEM_ZEROINIT, size * nmemb);
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}
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static INLINE void* libc_realloc(void* old, int size) {
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int oldsize = (int) LocalSize((HLOCAL) old);
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void *mem;
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if (size <= oldsize) return old;
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mem = LocalAlloc(LMEM_FIXED, size);
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libc_memcpy(mem, old, oldsize);
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LocalFree((HLOCAL) old);
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return mem;
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}
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static INLINE void libc_free(void *mem) {
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LocalFree((HLOCAL) mem);
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}
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static INLINE double libc_frexp(double x, int *e) {
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double res = -9999.999;
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unsigned __int64 i = *(unsigned __int64*)(&x);
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if (!(i & 0x7F00000000000000UL)) {
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*e = 0;
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return x;
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}
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*e = ((i << 1) >> 53) - 1022;
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i &= 0x800FFFFFFFFFFFFFUL;
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i |= 0x3FF0000000000000UL;
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return *(double*)(&i) * 0.5;
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}
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static INLINE double __declspec(naked) libc_exp(double x) { __asm {
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fldl2e
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fld qword ptr [esp+4]
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fmul
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fst st(1)
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frndint
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fxch
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fsub st(0), st(1)
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f2xm1
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fld1
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fadd
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fscale
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ret
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} }
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static INLINE double __declspec(naked) libc_pow(double b, double e) { __asm {
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fld qword ptr [esp+12]
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fld qword ptr [esp+4]
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fyl2x
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// following is a copy of libc_exp:
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fst st(1)
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frndint
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fxch
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fsub st(0), st(1)
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f2xm1
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fld1
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fadd
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fscale
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ret
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} }
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#else // NEED_MINILIBC == 0
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#define libc_malloc malloc
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#define libc_calloc calloc
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#define libc_realloc realloc
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#define libc_free free
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#define libc_memset memset
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#define libc_memcpy memcpy
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#define libc_memmove memmove
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#define libc_frexp frexp
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#define libc_exp exp
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#define libc_pow pow
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#endif // NEED_MINILIBC
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#endif//__LIBC_H_INCLUDED__
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