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- strlen_diy:
- mv a5,a0
- .L2:
- lbu a4,0(a5)
- addi a5,a5,1
- bne a4,zero,.L2
- sub a0,a5,a0
- addi a0,a0,-1
- ret
- memchr_diy:
- andi a1,a1,0xff
- .L5:
- beq a2,zero,.L8
- lbu a5,0(a0)
- bne a5,a1,.L7
- ret
- .L7:
- addi a0,a0,1
- addi a2,a2,-1
- j .L5
- .L8:
- li a0,0
- ret
- strnlen_diy:
- addi sp,sp,-32
- sd s0,16(sp)
- mv a2,a1
- mv s0,a1
- li a1,0
- sd s1,8(sp)
- sd ra,24(sp)
- mv s1,a0
- call memchr_diy
- beq a0,zero,.L10
- sub s0,a0,s1
- .L10:
- ld ra,24(sp)
- mv a0,s0
- ld s0,16(sp)
- ld s1,8(sp)
- addi sp,sp,32
- jr ra
- strcpy_diy:
- mv a5,a0
- .L16:
- lbu a4,0(a1)
- addi a1,a1,1
- addi a5,a5,1
- sb a4,-1(a5)
- bne a4,zero,.L16
- ret
- strcat_diy:
- addi sp,sp,-32
- sd ra,24(sp)
- sd s0,16(sp)
- sd a1,8(sp)
- mv s0,a0
- call strlen_diy
- ld a1,8(sp)
- add a0,s0,a0
- call strcpy_diy
- ld ra,24(sp)
- mv a0,s0
- ld s0,16(sp)
- addi sp,sp,32
- jr ra
- .LC1:
- .string "len: %d\n"
- .LC2:
- .string "Hello C/C++ LIBC:"
- .LC3:
- .string "-> strcat_diy"
- .LC0:
- .string "Hello World -> (strlen_diy memchr_diy strcpy_diy strcat_diy)"
- .type main, @function
- main:
- addi sp,sp,-80
- sd s0,64(sp)
- mv s0,sp
- li a2,61
- lla a1,.LC0
- mv a0,s0
- sd ra,72(sp)
- call memcpy@plt
- mv a0,s0
- call strlen_diy
- mv a2,a0
- li a1,40
- mv a0,s0
- call memchr_diy
- call puts@plt
- mv a0,s0
- call strlen_diy
- sext.w a1,a0
- lla a0,.LC1
- call printf@plt
- li a1,100
- mv a0,s0
- call strnlen_diy
- sext.w a1,a0
- lla a0,.LC1
- call printf@plt
- lla a1,.LC2
- mv a0,s0
- call strcpy_diy
- call puts@plt
- lla a1,.LC3
- mv a0,s0
- call strcat_diy
- call puts@plt
- ld ra,72(sp)
- ld s0,64(sp)
- li a0,0
- addi sp,sp,80
- jr ra
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