assembly - Compare two strings case-insensitive -

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i have code:

section .data    msg1 db "equal"    msg1len equ $ -msg1     msg2 db "not equal"    msg2len equ $ -msg2     str1 db "abcde"    str1len equ $-str1     str2 db "abcde"    str2len equ $ -str2  section .text    global _start  _start:    mov esi,str1    mov edi,str2    mov ecx,str2len+1    cld    repe cmpsb    jecxz equal  ;jumps if equal             ;if not equal    mov eax,4    mov ebx,1    mov ecx,msg2    mov edx,msg2len    int 80h     jmp exit  equal:    mov eax,4    mov ebx,1    mov ecx,msg1    mov edx,msg1len    int 80h  exit:    mov eax,1    mov ebx,0    int 80h

what i'm trying make case-insensitive "abcde" still equal "abcde". however, case-sensitive. how make case-insensitive? appreciated.

one common approach convert 2 strings common case, example uppercase, , compare those. if don't want manipulate strings beforehand, can on fly, converting current checked characters common case , comparing. take @ ascii chart figure out difference between 2 cases of characters can convert 1 other.


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