?? getpass.c
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#include <signal.h>#include <stdio.h>#include <termios.h>#define MAX_PASS_LEN 8 /* max #chars for user to enter */char *getpass(const char *prompt){ static char buf[MAX_PASS_LEN + 1]; /* null byte at end */ char *ptr; sigset_t sig, osig; struct termios ts, ots; FILE *fp; int c; if ((fp = fopen(ctermid(NULL), "r+")) == NULL) return(NULL); setbuf(fp, NULL); sigemptyset(&sig); sigaddset(&sig, SIGINT); /* block SIGINT */ sigaddset(&sig, SIGTSTP); /* block SIGTSTP */ sigprocmask(SIG_BLOCK, &sig, &osig); /* and save mask */ tcgetattr(fileno(fp), &ts); /* save tty state */ ots = ts; /* structure copy */ ts.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL); tcsetattr(fileno(fp), TCSAFLUSH, &ts); fputs(prompt, fp); ptr = buf; while ((c = getc(fp)) != EOF && c != '\n') if (ptr < &buf[MAX_PASS_LEN]) *ptr++ = c; *ptr = 0; /* null terminate */ putc('\n', fp); /* we echo a newline */ tcsetattr(fileno(fp), TCSAFLUSH, &ots); /* restore TTY state */ sigprocmask(SIG_SETMASK, &osig, NULL); /* restore mask */ fclose(fp); /* done with /dev/tty */ return(buf);}?? 快捷鍵說明
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