实现输入密码回显*号

 

#include <termio.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

int GetTermInput(char *buf, int len ,char *prompt, char echo);

int main(int argc, char **argv)
{
    char name[1024];
    char password[1024], verifypwd[1024];
    int ret;

    memset(name, 0, sizeof(name));
    GetTermInput(name, 1024, "New user name:", 0);
    printf("\n");
    memset(password, 0, sizeof(password));
    GetTermInput(password, 1024, "New password:", '*');
    printf("\n");
    memset(verifypwd, 0, sizeof(verifypwd));
    GetTermInput(verifypwd, 1024, "Retype new password:", '*');
    printf("\n");

    printf("name[%s]\n", name);
    printf("pwd[%s]\n", password);
    printf("verify[%s]\n", verifypwd);

}

int GetTermInput(char *buf, int len ,char *prompt, char echo)
{
    struct termio tio, tin;
    char selected;
    int order;

    order = 0;

    ioctl(0, TCGETA, &tio);
    tin = tio;
    tin.c_lflag &= ~ECHO; /* turn off ECHO */
    tin.c_lflag &= ~ICANON; /* turn off ICANON */
    tin.c_lflag &= ~ISIG;
    tin.c_cc[VINTR]=1;
    tin.c_cc[VMIN]=1;
    tin.c_cc[VTIME]=0;
    ioctl(0,TCSETA,&tin);

    printf("%s", prompt);
    do{
        selected =fgetc(stdin);
        if((selected=='\b')&&(order>0))
        {
            fputc('\b',stdout);
            fputc(' ',stdout);
            fputc('\b',stdout);
            order--;
            buf--;
            *buf='\0';
        }
        else if((selected!='\n')&&(selected!='\r')&&(selected!='\b'))
        {

            *buf++=selected;
            order++;
            fputc(echo?echo:selected,stdout);
            fflush(stdout);
        }
    }while ((selected!='\n')&&(selected!='\r')&&(order>=0)&&(order<len));

    /*
     * * Reset the old tty modes.
     * */
    ioctl(0, TCSETA, &tio);

    return 0;
}