proggen.org

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#include <stdio.h>
#include <string.h>

#define MAX_LEN 1024

int main( int argc, char *argv[] )
{
  char password[MAX_LEN] = {0};
  char input[MAX_LEN] = {0};
  int inputLength;
  int passwordLength;
    
  printf( "----- Vulnerable Screen Locker -----\n" );
  printf( "Enter password: " );
  fflush( stdout );
  fgets( password, sizeof( password ), stdin );
  passwordLength = strlen( password );
  password[passwordLength - 1] = '\0';
  --passwordLength;
  printf( "\nScreen locked\n" );
  
  while( 1 )
  {
    printf( "\n\nEnter password to unlock: " );
    fflush( stdout );
    fgets( input, sizeof( input ), stdin );
    inputLength = strlen( input );
    input[inputLength - 1] = '\0';
    --inputLength;
    if( passwordLength == inputLength && strcmp( input, password ) == 0 )
    {
      printf( "Screen unlocked\n" );
      return 0;
    }
    printf( "Incorrect password. This incident will be reported. Password tried: " );
    printf( input );
    fflush( stdout );
  }
  
  return 0;
}

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strlen ( string);

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  --passwordLength;

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i--; // anstelle von --i;

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int a, b;
a = 3;
b = --a;
//b = a--;
if(a == b) { printf("gleich\n"); } else { printf("ungleich\n"); }