Revert 175069

third_party/scrypt/lib/util/readpass.c

Index: third_party/scrypt/lib/util/readpass.c
===================================================================
--- third_party/scrypt/lib/util/readpass.c	(revision 175254)
+++ third_party/scrypt/lib/util/readpass.c	(working copy)
@@ -1,143 +0,0 @@
-/*-
- * Copyright 2009 Colin Percival
- * 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 "scrypt_platform.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <termios.h>
-#include <unistd.h>
-
-#include "warn.h"
-
-#include "readpass.h"
-
-#define MAXPASSLEN 2048
-
-/**
- * tarsnap_getpass(passwd, prompt, confirmprompt, devtty)
- * If ${devtty} is non-zero, read a password from /dev/tty if possible; if
- * not, read from stdin.  If reading from a tty (either /dev/tty or stdin),
- * disable echo and prompt the user by printing ${prompt} to stderr.  If
- * ${confirmprompt} is non-NULL, read a second password (prompting if a
- * terminal is being used) and repeat until the user enters the same password
- * twice.  Return the password as a malloced NUL-terminated string via
- * ${passwd}.  The obscure name is to avoid namespace collisions due to the
- * getpass / readpass / readpassphrase / etc. functions in various libraries.
- */
-int
-tarsnap_readpass(char ** passwd, const char * prompt,
-    const char * confirmprompt, int devtty)
-{
-	FILE * readfrom;
-	char passbuf[MAXPASSLEN];
-	char confpassbuf[MAXPASSLEN];
-	struct termios term, term_old;
-	int usingtty;
-
-	/*
-	 * If devtty != 0, try to open /dev/tty; if that fails, or if devtty
-	 * is zero, we'll read the password from stdin instead.
-	 */
-	if ((devtty == 0) || ((readfrom = fopen("/dev/tty", "r")) == NULL))
-		readfrom = stdin;
-
-	/* If we're reading from a terminal, try to disable echo. */
-	if ((usingtty = isatty(fileno(readfrom))) != 0) {
-		if (tcgetattr(fileno(readfrom), &term_old)) {
-			warn("Cannot read terminal settings");
-			goto err1;
-		}
-		memcpy(&term, &term_old, sizeof(struct termios));
-		term.c_lflag = (term.c_lflag & ~ECHO) | ECHONL;
-		if (tcsetattr(fileno(readfrom), TCSANOW, &term)) {
-			warn("Cannot set terminal settings");
-			goto err1;
-		}
-	}
-
-retry:
-	/* If we have a terminal, prompt the user to enter the password. */
-	if (usingtty)
-		fprintf(stderr, "%s: ", prompt);
-
-	/* Read the password. */
-	if (fgets(passbuf, MAXPASSLEN, readfrom) == NULL) {
-		warn("Cannot read password");
-		goto err2;
-	}
-
-	/* Confirm the password if necessary. */
-	if (confirmprompt != NULL) {
-		if (usingtty)
-			fprintf(stderr, "%s: ", confirmprompt);
-		if (fgets(confpassbuf, MAXPASSLEN, readfrom) == NULL) {
-			warn("Cannot read password");
-			goto err2;
-		}
-		if (strcmp(passbuf, confpassbuf)) {
-			fprintf(stderr,
-			    "Passwords mismatch, please try again\n");
-			goto retry;
-		}
-	}
-
-	/* Terminate the string at the first "\r" or "\n" (if any). */
-	passbuf[strcspn(passbuf, "\r\n")] = '\0';
-
-	/* If we changed terminal settings, reset them. */
-	if (usingtty)
-		tcsetattr(fileno(readfrom), TCSANOW, &term_old);
-
-	/* Close /dev/tty if we opened it. */
-	if (readfrom != stdin)
-		fclose(readfrom);
-
-	/* Copy the password out. */
-	if ((*passwd = strdup(passbuf)) == NULL) {
-		warn("Cannot allocate memory");
-		goto err1;
-	}
-
-	/* Zero any stored passwords. */
-	memset(passbuf, 0, MAXPASSLEN);
-	memset(confpassbuf, 0, MAXPASSLEN);
-
-	/* Success! */
-	return (0);
-
-err2:
-	/* Reset terminal settings if necessary. */
-	if (usingtty)
-		tcsetattr(fileno(readfrom), TCSAFLUSH, &term_old);
-err1:
-	/* Close /dev/tty if we opened it. */
-	if (readfrom != stdin)
-		fclose(readfrom);
-
-	/* Failure! */
-	return (-1);
-}