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Polish up strcpy code

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This commit is contained in:
Kiril Kovachev 2025-01-24 19:01:05 +00:00
parent d23173c8de
commit 7498741388
1 changed files with 4 additions and 10 deletions
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14
lib/strcpy.S
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@ -1,23 +1,17 @@
.intel_syntax noprefix .intel_syntax noprefix
.globl _start
.text .text
# String-copying routine. Strings should be null-terminated.
# String-copying routine. # Input: rdi = source string base, rsi = destination string base
# Commented-out lines would also return the starting address of the destination address. # No check is done for buffer overflow.
strcpy: strcpy:
# push rsi
.loop:
movb r10b, [rdi] movb r10b, [rdi]
cmpb r10b, 0 cmpb r10b, 0
je .end je .end
movb [rsi], r10b movb [rsi], r10b
inc rdi inc rdi
inc rsi inc rsi
jmp .loop jmp strcpy
.end: .end:
# pop rax
ret ret