144 lines
2.3 KiB
NASM
144 lines
2.3 KiB
NASM
extern NR_exit
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extern strclr
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section .text
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global min
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global minu
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global max
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global maxu
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global islower
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global isupper
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global tolower
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global toupper
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global itoa
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global exit
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;----- min(int a, int b) -----;
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; return value: lowest value
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min:
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mov rax, rdi
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cmp rdi, rsi
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cmovg rax, rsi
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ret
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;----- minu(unsigned int a, unsigned int b) -----;
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; return value: lowest value
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minu:
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mov rax, rdi
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cmp rdi, rsi
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cmova rax, rsi
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ret
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;----- max(int a, int b) -----;
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; return value: highest value
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max:
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mov rax, rdi
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cmp rdi, rsi
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cmovl rax, rsi
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ret
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;----- maxu(unsigned int a, unsigned int b) -----;
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; return value: highest value
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maxu:
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mov rax, rdi
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cmp rdi, rsi
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cmovb rax, rsi
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ret
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;----- islower(char* c) -----;
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; return value: 1 (character is in range of 'a'-'z') or 0 (character is nog in range of 'a'-'z')
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islower:
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xor rax, rax
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cmp byte [rdi], 'a'
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jb .quit
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cmp byte [rdi], 'z'
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ja .quit
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mov rax, 1
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.quit:
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ret
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;----- isupper(char* c) -----;
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; return value: 1 (character is in range of 'A'-'Z') or 0 (character is not in range of 'A'-'Z')
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isupper:
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xor rax, rax
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cmp byte [rdi], 'A'
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jb .quit
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cmp byte [rdi], 'Z'
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ja .quit
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mov rax, 1
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.quit:
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ret
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;----- tolower(char* c) -----;
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; return value: ASCII value. Same as original if it was not an uppercase letter, otherwise lowercase letter
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tolower:
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call isupper
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mov rcx, rax
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mov al, byte [rdi]
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cmp rcx, 1
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jne .quit
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add al, 32
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.quit:
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ret
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;----- toupper(char* c) -----;
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; return value: ASCII value. Same as original if it was not a lowercase letter, otherwise uppercase letter
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toupper:
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call islower
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mov rcx, rax
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mov al, byte [rdi]
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cmp rcx, 1
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jne .quit
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sub al, 32
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.quit:
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ret
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;----- itoa(int num, char* str) -----;
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; return value: pointer to str
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itoa:
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push rbx
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push rsi
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push rdi
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mov rdi, rsi
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call strclr
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pop rdi
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mov rax, rdi
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mov r8, rsi
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xor rcx, rcx
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test rax, rax
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jnz .checkNeg
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mov byte [rsi], '0'
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mov byte [rsi+1], 0
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jmp .quit
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.checkNeg:
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xor rbx, rbx
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test rax, rax
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jns .convert
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neg rax
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mov rbx, 1
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.convert:
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xor rdx, rdx
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mov r10, 10
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div r10
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add rdx, '0'
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push rdx
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inc rcx
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test rax, rax
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jnz .convert
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test rbx, rbx
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jz .toString
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push byte '-'
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inc rcx
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.toString:
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pop rdx
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mov byte [rsi], dl
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inc rsi
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loop .toString
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mov byte [rsi], 0
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.quit:
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pop rax
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pop rbx
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ret
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;----- exit(int exit_code) -----;
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; returns: nothing
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exit:
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mov rax, NR_exit
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syscall
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