115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of LibMaxsi.
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LibMaxsi is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
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memory.cpp
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Useful functions for manipulating and handling memory.
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******************************************************************************/
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#include <libmaxsi/platform.h>
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#include <libmaxsi/memory.h>
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#include <libmaxsi/error.h>
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#ifndef SORTIX_KERNEL
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#include <libmaxsi/syscall.h>
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#endif
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namespace Maxsi
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{
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namespace Memory
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{
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#ifndef SORTIX_KERNEL
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DEFN_SYSCALL2(int, SysMemStat, SYSCALL_MEMSTAT, size_t*, size_t*);
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DEFN_SYSCALL1(void*, SysSbrk, SYSCALL_SBRK, intptr_t);
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DEFN_SYSCALL0(size_t, SysGetPageSize, SYSCALL_GET_PAGE_SIZE);
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extern "C" int memstat(size_t* memused, size_t* memtotal)
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{
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return SysMemStat(memused, memtotal);
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}
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extern "C" void* sbrk(intptr_t increment)
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{
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return SysSbrk(increment);
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}
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extern "C" size_t getpagesize(void)
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{
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return SysGetPageSize();
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}
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// TODO: This is a hacky implementation!
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extern "C" void* memmove(void* _dest, const void* _src, size_t n)
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{
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uint8_t* dest = (uint8_t*) _dest;
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const uint8_t* src = (const uint8_t*) _src;
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uint8_t* tmp = new uint8_t[n];
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Memory::Copy(tmp, src, n);
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Memory::Copy(dest, tmp, n);
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delete[] tmp;
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return _dest;
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}
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#endif
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DUAL_FUNCTION(void*, memcpy, Copy, (void* Dest, const void* Src, size_t Length))
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{
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char* D = (char*) Dest; const char* S = (const char*) Src;
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for ( size_t I = 0; I < Length; I++ )
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{
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D[I] = S[I];
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}
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return Dest;
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}
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DUAL_FUNCTION(void*, memset, Set, (void* Dest, int Value, size_t Length))
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{
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byte* D = (byte*) Dest;
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for ( size_t I = 0; I < Length; I++ )
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{
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D[I] = Value & 0xFF;
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}
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return Dest;
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}
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DUAL_FUNCTION(int, memcmp, Compare, (const void* a, const void* b, size_t size))
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{
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const byte* buf1 = (const byte*) a;
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const byte* buf2 = (const byte*) b;
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for ( size_t i = 0; i < size; i++ )
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{
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if ( buf1[i] != buf2[i] ) { return (int)(buf1[i]) - (int)(buf2[i]); }
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}
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return 0;
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}
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DUAL_FUNCTION(void*, memchr, Seek, (const void* s, int c, size_t size))
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{
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const byte* buf = (const byte*) s;
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for ( size_t i = 0; i < size; i++ )
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{
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if ( buf[i] == c ) { return (void*) (buf + i); }
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}
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return NULL;
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}
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}
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}
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