forked from KolibriOS/kolibrios
71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
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/***************************************************************************************************
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* Copyright (C) Vasiliy Kosenko (vkos), 2009 *
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* Kobra is free software: you can redistribute it and/or modify it under the terms of the GNU *
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* General Public License as published by the Free Software Foundation, either version 3 *
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* of the License, or (at your option) any later version. *
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* *
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* Kobra is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without *
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* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License along with Kobra. *
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* If not, see <http://www.gnu.org/licenses/>. *
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***************************************************************************************************/
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/***************************************************************************************************
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* Some stdlib functions *
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***************************************************************************************************/
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#include "stdlib.h"
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void *memcpy(void *dst, void *src, int length){
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void *value;
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if (length & 3) { //length not aligned in 4 bytes use rep movsb
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__asm__ __volatile__(
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"movl %%edi,%%eax\n\t"
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"cld\n\t"
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"rep\n\t"
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"movsb"
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:"=D"(value)
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:"c"(length),"S"(src),"D"(dst)
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:"eax");
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} else { //length aligned in 4 bytes use rep movsd
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length=length >> 2;//length=length/4
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__asm__ __volatile__(
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"movl %%edi,%%eax\n\t"
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"cld\n\t"
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"rep\n\t"
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"movsd"
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:"=D"(value)
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:"c"(length),"S"(src),"D"(dst)
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:"eax");
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}
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return(value);
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}
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char strcmp(char *s1, char *s2){
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while (*s1) {
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if (*s1++ != *s2++) {
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return *--s1-*--s2;
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}
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}
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return 0;
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}
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int strlen(char *s){
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int i;
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while (*s++) {
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++i;
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}
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return i;
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}
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char *strcpy(char *dest, char *src){
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while (*src) {
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*dest++ = *src++;
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}
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*dest = '\0';
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}
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