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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 . * |
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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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} |