BSD 3 development

[unix-history] / usr / src / libc / stdio / getpass.c

#include <stdio.h>
#include <signal.h>
#include <sgtty.h>

char *
getpass(prompt)
char *prompt;
{
       struct sgttyb ttyb;
       int flags;
       register char *p;
       register c;
       FILE *fi;
       static char pbuf[9];
       int (*signal())();
       int (*sig)();

       if ((fi = fopen("/dev/tty", "r")) == NULL)
               fi = stdin;
       else
               setbuf(fi, (char *)NULL);
       sig = signal(SIGINT, SIG_IGN);
       gtty(fileno(fi), &ttyb);
       flags = ttyb.sg_flags;
       ttyb.sg_flags &= ~ECHO;
       stty(fileno(fi), &ttyb);
       fprintf(stderr, prompt);
       for (p=pbuf; (c = getc(fi))!='\n' && c!=EOF;) {
               if (p < &pbuf[8])
                       *p++ = c;
       }
       *p = '\0';
       fprintf(stderr, "\n");
       ttyb.sg_flags = flags;
       stty(fileno(fi), &ttyb);
       signal(SIGINT, sig);
       if (fi != stdin)
               fclose(fi);
       return(pbuf);
}