Libc-262.tar.gz

[apple/libc.git] / gen / getpass.c

diff --git a/gen/getpass.c b/gen/getpass.c
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+++ b/gen/getpass.c
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1988, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#include <sys/termios.h>
+#include <sys/signal.h>
+
+#include <paths.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <unistd.h>
+
+char *
+getpass(prompt)
+       const char *prompt;
+{
+       struct termios term;
+       register int ch;
+       register char *p;
+       FILE *fp, *outfp;
+       long omask;
+       int echo;
+       static char buf[_PASSWORD_LEN + 1];
+
+       /*
+        * read and write to /dev/tty if possible; else read from
+        * stdin and write to stderr.
+        */
+       if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) {
+               outfp = stderr;
+               fp = stdin;
+       }
+       /*
+        * note - blocking signals isn't necessarily the
+        * right thing, but we leave it for now.
+        */
+       omask = sigblock(sigmask(SIGINT)|sigmask(SIGTSTP));
+       (void)tcgetattr(fileno(fp), &term);
+       if (echo = (term.c_lflag & ECHO)) {
+               term.c_lflag &= ~ECHO;
+               (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
+       }
+       (void)fputs(prompt, outfp);
+       rewind(outfp);                  /* implied flush */
+       for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';)
+               if (p < buf + _PASSWORD_LEN)
+                       *p++ = ch;
+       *p = '\0';
+       (void)write(fileno(outfp), "\n", 1);
+       if (echo) {
+               term.c_lflag |= ECHO;
+               (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
+       }
+       (void)sigsetmask(omask);
+       if (fp != stdin)
+               (void)fclose(fp);
+       return(buf);
+}