usr/src/lib/libbc/libc/gen/common/getpass.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1987 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984 AT&T */
  28 /*        All Rights Reserved   */
  29
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 /*LINTLIBRARY*/
  34 #include <stdio.h>
  35 #include <signal.h>
  36 #include <termios.h>
  37 #include <unistd.h>
  38
  39 extern void setbuf();
  40 extern int      fclose(FILE *);
  41 extern int      fprintf(FILE *, char *, ...);
  42 extern int      findiop();
  43 extern int ioctl();
  44 static int intrupt;
  45
  46 static void     catch(void);
  47
  48 #define MAXPASSWD       8       /* max significant characters in password */
  49
  50 char *
  51 getpass(char *prompt)
  52 {
  53         struct termios ttyb;
  54         long flags;
  55         char *p;
  56         int c;
  57         FILE    *fi;
  58         static char pbuf[ MAXPASSWD + 1 ];
  59         struct sigvec osv, sv;
  60
  61         if((fi = fopen("/dev/tty", "r")) == NULL)
  62 #ifdef S5EMUL
  63                 return((char*)NULL);
  64 #else
  65                 fi = stdin;
  66 #endif
  67         else
  68                 setbuf(fi, (char*)NULL);
  69         sv.sv_handler = catch;
  70         sv.sv_mask = 0;
  71         sv.sv_flags = SV_INTERRUPT;
  72         (void) sigvec(SIGINT, &sv, &osv);
  73         intrupt = 0;
  74         (void) ioctl(fileno(fi), TCGETS, &ttyb);
  75         flags = ttyb.c_lflag;
  76         ttyb.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
  77         (void) ioctl(fileno(fi), TCSETSF, &ttyb);
  78         (void) fputs(prompt, stderr);
  79         p = pbuf;
  80         while( !intrupt  &&
  81                 (c = getc(fi)) != '\n'  &&  c != '\r'  &&  c != EOF ) {
  82                 if(p < &pbuf[ MAXPASSWD ])
  83                         *p++ = c;
  84         }
  85         *p = '\0';
  86         ttyb.c_lflag = flags;
  87         (void) ioctl(fileno(fi), TCSETSW, &ttyb);
  88         (void) putc('\n', stderr);
  89         (void) sigvec(SIGINT, &osv, (struct sigvec *)NULL);
  90         if(fi != stdin)
  91                 (void) fclose(fi);
  92 #ifdef S5EMUL   /* XXX - BOTH versions should probably do this! */
  93         if(intrupt)
  94                 (void) kill(getpid(), SIGINT);
  95 #endif
  96         return(pbuf);
  97 }
  98
  99 static void
 100 catch(void)
 101 {
 102         ++intrupt;
 103 }