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- ;;; Required packages: nasm, gcc
- ;;; compile commands:
- ;;; nasm -f elf 06-scanf.asm -o bin/06-scanf.o
- ;;; gcc -m32 -o bin/06-scanf bin/06-scanf.o
- %define SYSCALL_EXIT 1 ; system call sys_exit
- %define INT32_BYTES_SIZE 4
- %define FLOAT32_BYTES_SIZE 4
- %define STRING_BUFFER_SIZE 32
- section .data
- questionString db "Please enter a string.", 0xa, 0x0
- questionInt32 db "Please enter any integer number.", 0xa, 0x0
- questionFloat32 db "Please enter any decimal number.", 0xa, 0x0
- prompt db "> ", 0x0
- resultMessage db "Entered: string %s, int %d, float %f", 0xa, 0x0
- scanInt32Fmt db "%d", 0x0
- scanFloat32Fmt db "%f", 0x0
- scanStringFmt db "%s", 0x0
- section .bss
- inum resb INT32_BYTES_SIZE
- fnum resb FLOAT32_BYTES_SIZE
- text resb STRING_BUFFER_SIZE
- section .text
- extern scanf
- extern printf
- global main
- main:
- call printStringPrompt
- call scanString
- call printInt32Prompt
- call scanInt32
- call printFloat32Prompt
- call scanFloat32
- call printMessage
-
- mov eax, SYSCALL_EXIT
- mov ebx, 0
- int 0x80
- ret
- scanInt32:
- push inum
- push scanInt32Fmt
- call scanf
- add esp, 8
- ret
- scanFloat32:
- push fnum
- push scanFloat32Fmt
- call scanf
- add esp, 8
- ret
- scanString:
- push text
- push scanStringFmt
- call scanf
- add esp, 8
- ret
- printInt32Prompt:
- push questionInt32
- call printf
- add esp, 4
- push prompt
- call printf
- add esp, 4
- ret
- printFloat32Prompt:
- push questionFloat32
- call printf
- add esp, 4
- push prompt
- call printf
- add esp, 4
- ret
- printStringPrompt:
- push questionString
- call printf
- add esp, 4
- push prompt
- call printf
- add esp, 4
- ret
- printMessage:
- sub esp, 8 ; reserve stack for a float64 (%f requires float64 in printf)
- mov ebx, fnum
- fld DWORD [ebx] ; load float32 in current stack place (32 bits)
- fstp QWORD [esp] ; store float64 (8087 does the conversion from float32 internally)
- push DWORD [inum]
- push text
- push resultMessage
- call printf
- add esp, 20
- ret
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