I had to implement BSD's readpassprase for my openssh port.
I think it's good to have it since tcsetattr is broken, hence 
getpass(), which uses /sys/src/ape/lib/v/plan9/tty.c doesn't work.
so, here it is :)

thanks

Federico G. Benavento


Notes:
Mon Jan 21 00:25:59 EST 2008 geoff
    I think I'd rather fix tcsetattr.  What's broken about it?

Wed Feb 6 14:38:02 EST 2008 geoff
    I rewrote getpass, tty_echoon and tty_echooff instead.


Reference: /n/sources/patch/sorry/ape-readpassphrase
Date: Mon Jan 21 06:12:43 CET 2008
Signed-off-by: benavento@gmail.com
Reviewed-by: geoff

--- /sys/include/ape/readpassphrase.h	Thu Jan  1 00:00:00 1970
+++ /sys/include/ape/readpassphrase.h	Mon Jan 21 06:12:43 2008
@@ -0,0 +1,17 @@
+#ifndef _READPASSPHRASE_H
+#define _READPASSPHRASE_H
+#ifndef _BSD_EXTENSION
+    This header file is an extension to ANSI/POSIX
+#endif
+
+#define RPP_ECHO_OFF    0x00
+#define RPP_ECHO_ON     0x01
+#define RPP_REQUIRE_TTY 0x02
+#define RPP_FORCELOWER  0x04
+#define RPP_FORCEUPPER  0x08
+#define RPP_SEVENBIT    0x10
+#define RPP_STDIN       0x20
+
+extern char * readpassphrase(const char *, char *, size_t, int);
+
+#endif /* _READPASSPHRASE_H */
--- /sys/src/ape/lib/bsd/mkfile	Mon Jan 21 06:12:43 2008
+++ /sys/src/ape/lib/bsd/mkfile	Mon Jan 21 06:12:43 2008
@@ -31,6 +31,7 @@
 	popen.$O\
 	putenv.$O\
 	rcmd.$O\
+	readpassphrase.$O\
 	readv.$O\
 	rresvport.$O\
 	send.$O\
--- /sys/src/ape/lib/bsd/readpassphrase.c	Thu Jan  1 00:00:00 1970
+++ /sys/src/ape/lib/bsd/readpassphrase.c	Wed Feb  6 20:03:44 2008
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <signal.h>
+#include <readpassphrase.h>
+#include "sys9.h"
+
+char *
+readpassphrase(const char *prompt, char *buf, size_t nbuf, int flags)
+{
+	int c, cfd;
+	char *p;
+	FILE *fi;
+	void (*sig)(int);
+
+	if (!(flags & RPP_STDIN) && (fi = fopen("/dev/cons", "r")) != NULL){
+		setbuf(fi, NULL);
+		if(!(flags & RPP_ECHO_ON))
+			if((cfd = _OPEN("/dev/consctl", OWRITE)) >= 0)
+				_WRITE(cfd, "rawon", 5);
+	} else {
+		if (flags & RPP_REQUIRE_TTY) {
+			errno = ENOTTY;
+			return NULL;
+		}
+		fi = stdin;
+	}
+	sig = signal(SIGINT, SIG_IGN);
+	if(!(flags & RPP_STDIN)) {
+		fprintf(stderr, "%s", prompt);
+		fflush(stderr);
+	}
+
+	for (p = buf; (c = getc(fi)) != '\n' && c !=' \r' && c != EOF; )
+		if (p < buf + nbuf - 1) {
+			if (flags & RPP_SEVENBIT)
+				c &= 0xff;
+			if (isalpha(c)) {
+				if (flags & RPP_FORCELOWER)
+					c = tolower(c);
+				if (flags & RPP_FORCEUPPER)
+					c = toupper(c);
+			}
+			*p++ = c;
+		}
+	*p = '\0';
+
+	if (!(flags & RPP_STDIN)) {
+		fprintf(stderr, "\n");
+		fflush(stderr);
+	}
+	if (!(flags & RPP_ECHO_ON) && cfd) {
+		_WRITE(cfd, "rawoff", 6);
+		_CLOSE(cfd);
+	}
+	signal(SIGINT, sig);
+	if (fi != stdin)
+		fclose(fi);
+	return buf;
+}