g2ej8.asm

format PE
entry main

section '.text' code readable executable

main:
  push    intro1
  push    format_output
  call    [printf]
  add     esp,8

  push    string1
  push    format_input
  call    [scanf]
  add     esp,8

  push    string1

  push    intro2
  push    format_output
  call    [printf]
  add     esp,8

  push    string2
  push    format_input
  call    [scanf]
  add     esp,8

  mov     edi,string2
  pop     esi

  xor     ebx,ebx
  xor     ecx,ecx
  xor     edx,edx
;       edx=indice de coincidencia de string
;       ecx=indice de string principal
;       ebx=indice de substring

_bucle:
  movzx   eax,byte[esi]
  cmp     eax,0
  je      _final_sin_coincidencia

  cmp     al,byte[edi+ebx]
  je      _coincidencia
  xor     edx,edx
  xor     ebx,ebx
  inc     esi
  inc     ecx
  jmp     _bucle

_coincidencia:
  mov     edx,ecx
  inc     esi
  inc     ebx
  inc     ecx
  cmp     byte[edi+ebx],0
  je      _final_con_coincidencia
  jmp     _bucle

_final:
  push    num
  push    format_input
  call    [scanf]
  add     esp, 8

  push    0
  call    [exit]
  ret

_final_con_coincidencia:
  push    edx
  push    format_output2
  call    [printf]
  add     esp,8
  jmp     _final

_final_sin_coincidencia:
  push    outputsin
  push    format_output
  call    [printf]
  add     esp,8
  jmp     _final


section '.data' data readable writeable

num db ?
string1 rb 128
string2 rb 128
format_input db "%s",0
format_output db "%s",10,0
format_output2 db "%d",10,0

outputsin db "Sin coincidencias",0
intro1  db "Ingrese string",0
intro2  db "Ingrese substring",0

section '.idata' data import readable

include "macro\import32.inc"

library msvcrt, "MSVCRT.DLL"

import msvcrt,\
       printf ,'printf',\
       scanf  ,'scanf',\
       exit   ,'exit'