How do I code a password in c such that it doesnt show entered keys but asterks ****

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>

void beep(){
    printf("\a");
}

int InputPass(char * prompt,char *buff,int maxLen){
    int c,n=0;
    int x= _wherex(),y= _wherey();

    printf("%s: ",prompt);
    *buff=0;
    while(c=_getch()){
        if(c==0xd) return n;
        else if(c==8){
            if(!n)
                beep();
            else{
                printf("\b \b");
                n--;
            }
        }
        else if(c==0x1b){
            break;
        }
        else{
            if(!isprint(c)){
                beep();
                continue;
            }

            if(n<maxlen){>
                buff[n]=c;
                n++;
                buff[n]=0;
                printf("*");
            }else{
                beep();
            }
        }
    }
    return 0;
}


int main(){

    char buff[20];
    int n=InputPass("Enter password",buff,sizeof(buff));
    printf("\n");
    if(n==0){
        printf("input canceled\n");
    }else{
        printf("password is '%s'\n",buff);
    }

    return  0;
}