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/*
Copyright 2022 Gabriel Jensen.
This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
#indlude <rgo.h>
.global rgo_strcpy
rgo_strcpy:
/*
char const * lstr
char const * rstr
*/
#if defined(__x86_64__)
/* rax: Address of the current input character. */
movq %rdi,%rax
/* rsi: Address of the current output character. */
movq %rsi,%rsi
/* rdx: Current character. */
.loop:
movb (%rax),%dl
movb %dl,(%rsi)
testb %dl,%dl
jz .done
incq %rax
incq %rsi
jmp .loop
.done:
subq %rdi,%rax
ret
#endif
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