nasm - How to take string input from file in assembly Language? -


i have file named customer.txt.

customer.txt

amin jamal

i need sample code takes string input(amin) customer.txt file , print using c printf function.

my code 

section .bss s: resb 100  section .data  fmt: db "%s",10,0 name: db "customer.txt",0 mode: db "r+",0 fp: dq 0  section .text  global main extern fopen extern fgets extern printf main:   push rbp  mov rdi , name; mov rsi , mode call fopen mov [fp] , rax mov rdi , s mov rsi , 7 mov rdx , [fp] call fgets mov rdi , fmt mov rsi , s call printf  pop rbp ret

this can not take full string.

i using nasm assembler. os 64bit linux.

i use nasm command assemble, compile , run.

nasm -f elf64 file.asm gcc file.o ./a.out

your code works fine me. can add error handling. tried code , worked fine me.

section .bss s : resb 100  section .data fmt  : db "%s",10,0 name : db "customer.txt",0 mode : db "r+",0 err1 : db "failed open file", 10, 0 err2 : db "failed read file", 10, 0  section .text extern fopen extern fgets extern printf  global main  main:     push rbp      ; open file reading     mov rdi , name     mov rsi , mode     call fopen     cmp rax, 0       ; check errors     je .errfopen      ; read first 7 characters open file     mov rdi , s     mov rsi , 7     mov rdx , rax ; file pointer     call fgets     cmp rax, 0    ; check errors     je .errfgets      mov rdi, fmt     mov rsi, s     call printf      pop rbp     ret  .errfopen:     mov rdi, err1     call printf     pop rbp     ret  .errfgets:     mov rdi, err2     call printf     pop rbp     ret

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