(alternative) strcmp()
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31
string.asm
31
string.asm
@ -2,6 +2,7 @@ section .text
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global strlen
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global strcpy
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global strcat
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global strcmp
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;----- strlen(char* str) -----;
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; return value: amount of characters before EOS was found
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@ -63,3 +64,33 @@ strcat:
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leave
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ret
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;----- strcmp(char* str1, char* str2) -----;
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; return value: 0 if both strings are the same, otherwise index in array str1 where strings are to become different
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; returns -1 if str2 is longer than str1 and no difference was found before that happens
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strcmp:
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push rbp
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mov rbp, rsp
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call strlen
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mov rcx, rax
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mov rax, -1
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.compareLoop:
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inc rax
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cmp byte [rdi+rax], 0x0
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je .eosFound
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mov r10b, byte [rsi+rax]
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cmp byte [rdi+rax], r10b
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je .compareLoop
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jmp .quit
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.eosFound:
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mov r10, rax
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mov rdi, rsi
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call strlen
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cmp rax, r10
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jle .quit
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mov rax, -1
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.quit:
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leave
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ret
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73
tests.asm
73
tests.asm
@ -16,6 +16,7 @@ extern puts
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extern strlen
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extern strcpy
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extern strcat
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extern strcmp
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section .rodata
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PRINT_nums equ 1
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@ -31,6 +32,7 @@ section .rodata
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TEST_strcat equ 1
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TEST_tolower equ 1
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TEST_toupper equ 1
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TEST_strcmp equ 1
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num1 dq 13
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num2 dq -25
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@ -54,18 +56,21 @@ section .rodata
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msgIslower2 db "islower(str1[1]): %d",10,0
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msgIsupper db "isupper(str1[0]): %d",10,0
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msgIsupper2 db "isupper(str1[1]): %d",10,0
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msgStrcpy db "strcpy(str1Copy, str1): %s",10,0
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msgStrcat db "strcat(str1Copy, str3): %s",10,0
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msgStrlen3 db "strlen(str1Copy): %d",10,0
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msgStrcpy db "strcpy(strBuff, str1): %s",10,0
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msgStrcat db "strcat(strBuff, str3): %s",10,0
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msgStrlen3 db "strlen(strBuff): %d",10,0
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msgTolower db "tolower(str1[0]): %c",10,0
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msgTolower2 db "tolower(str1[1]): %c",10,0
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msgTolower3 db "tolower() for whole str1Copy: %s",10,0
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msgTolower3 db "tolower() for whole strBuff: %s",10,0
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msgToupper db "toupper(str1[0]): %c",10,0
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msgToupper2 db "toupper(str1[1]): %c",10,0
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msgToupper3 db "toupper() for whole str1Copy: %s",10,0
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msgToupper3 db "toupper() for whole strBuff: %s",10,0
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msgStrcmp db "strcmp(str1, str2): %d",10,0
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msgStrings2 db "Comparing...",10,"> str1: %s",10,"> strBuff: %s",10,0
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msgStrcmp2 db "strcmp(str1, strBuff): %d",10,0
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section .data
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section .bss
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str1Copy resb 32
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strBuff resb 32
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section .text
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global main
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main:
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@ -202,28 +207,28 @@ main:
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%ENDIF
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%IF TEST_strcpy
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; TEST: strcpy()
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lea rdi, [rel str1Copy]
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lea rdi, [rel strBuff]
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lea rsi, [rel str1]
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call strcpy
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xor rax, rax
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lea rdi, [rel msgStrcpy]
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lea rsi, [rel str1Copy]
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lea rsi, [rel strBuff]
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call printf
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%ENDIF
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%IF TEST_strcat
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; TEST: strcat()
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lea rdi, [rel str1Copy]
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lea rdi, [rel strBuff]
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lea rsi, [rel str3]
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call strcat
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xor rax, rax
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lea rdi, [rel msgStrcat]
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lea rsi, [rel str1Copy]
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lea rsi, [rel strBuff]
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call printf
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%ENDIF
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%IF TEST_strcat
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%IF TEST_strlen
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; TEST: strlen() for str1Copy
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lea rdi, [rel str1Copy]
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; TEST: strlen() for strBuff
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lea rdi, [rel strBuff]
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call strlen
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mov rsi, rax
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xor rax, rax
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@ -264,8 +269,8 @@ main:
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call printf
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%ENDIF
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%IF TEST_tolower
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; TEST: tolower: entire str1Copy
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lea rdi, [rel str1Copy]
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; TEST: tolower: entire strBuff
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lea rdi, [rel strBuff]
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call strlen
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mov rcx, rax
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.tolowerLoop:
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@ -282,12 +287,12 @@ main:
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loop .tolowerLoop
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xor rax, rax
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lea rdi, [rel msgTolower3]
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lea rsi, [rel str1Copy]
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lea rsi, [rel strBuff]
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call printf
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%ENDIF
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%IF TEST_toupper
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; TEST: toupper: entire str1Copy
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lea rdi, [rel str1Copy]
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; TEST: toupper: entire strBuff
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lea rdi, [rel strBuff]
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call strlen
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mov rcx, rax
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.toupperLoop:
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@ -304,9 +309,39 @@ main:
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loop .toupperLoop
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xor rax, rax
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lea rdi, [rel msgToupper3]
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lea rsi, [rel str1Copy]
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lea rsi, [rel strBuff]
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call printf
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%ENDIF
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%IF TEST_strcmp
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; TEST: strcmp(str1, str2)
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lea rdi, [rel str1]
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lea rsi, [rel str2]
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call strcmp
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mov rsi, rax
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xor rax, rax
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lea rdi, [rel msgStrcmp]
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call printf
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;
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lea rdi, [rel strBuff]
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lea rsi, [rel str1]
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call strcpy
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lea rdi, [rel strBuff]
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lea rsi, [rel str3]
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call strcat
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%IF PRINT_strs
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xor rax, rax
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lea rdi, [rel msgStrings2]
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lea rsi, [rel str1]
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lea rdx, [rel strBuff]
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call printf
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%ENDIF
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lea rdi, [rel str1]
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lea rsi, [rel strBuff]
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call strcmp
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mov rsi, rax
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xor rax, rax
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lea rdi, [rel msgStrcmp2]
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call printf
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%ENDIF
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leave
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ret
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