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/*
Copyright 2022 Gabriel Jensen
This file is part of rgo.
rgo is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
rgo is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with rgo. If not, see <https://www.gnu.org/licenses/>.
*/
#include <rgo.h>
.global rgo_strcpy
rgo_strcpy:
#if defined(__x86_64__)
/*
rdi: char const * lstr
rsi: char const * rstr
*/
/* rax: Address of the current input character. */
movq %rdi,%rax
/* rdx: Address of the current output character. */
movq %rsi,%rdx
/* cl: Current character. */
.loop:
movb (%rax),%cl
movb %cl,(%rdx)
testb %cl,%cl
jz .done
incq %rax
incq %rdx
jmp .loop
.done:
subq %rdi,%rax
ret
#endif
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