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root/usr/lib/libc/gen/getpass.c

DEFINITIONS

1. getpass

   1 /*
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 /* modified for Prex by Kohsuke Ohtani. */
  32 #include <sys/termios.h>
  33 #include <signal.h>
  34 #include <paths.h>
  35 #include <stdio.h>
  36 #include <unistd.h>
  38 char *
getpass(const char *prompt)
  40 {
  41         struct termios term;
  42         register int ch;
  43         register char *p;
FILE *fp, *outfp;
  45         long omask;
  46         int echo;
  47         static char buf[PASSWORD_LEN + 2];
  49         /*
  50          * read and write to /dev/tty if possible; else read from
  51          * stdin and write to stderr.
  52          */
  53         if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) {
outfp = stderr;
fp = stdin;
  56         }
  57         /*
  58          * note - blocking signals isn't necessarily the
  59          * right thing, but we leave it for now.
  60          */
omask = sigblock(sigmask(SIGINT)|sigmask(SIGTSTP));
  62         (void)tcgetattr(fileno(fp), &term);
  63         if ((echo = (term.c_lflag & ECHO)) != 0) {
term.c_lflag &= ~ECHO;
  65                 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
  66         }
  67         (void)fputs(prompt, outfp);
rewind(outfp);                  /* implied flush */
  69         for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';) {
  70                 if (p < buf + PASSWORD_LEN + 1)
  71                         *p++ = ch;
  72         }
  73         *p = '\0';
  74         (void)write(fileno(outfp), "\n", 1);
  75         if (echo) {
term.c_lflag |= ECHO;
  77                 (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
  78         }
  79         (void)sigsetmask(omask);
  80         if (fp != stdin)
  81                 (void)fclose(fp);
  82         return(buf);
  83 }