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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/.
.globl zap_strfill
zap_strfill:
# rdi: Address of the first character of the string.
# rsi: Fill character.
# rax: Address of the current character.
movq %rdi,%rax
# Iterate over string:
.loop:
# Check if we have reached the null-terminator:
cmpb $0x0,(%rax)
je .done # Exit loop if we have.
# Set the value of the current element:
movb %sil,(%rax)
# Continue to next character:
incq %rax
jmp .loop
# Finish:
.done:
# Get the length of the string:
subq %rdi,%rax
ret
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