devfs crypto code - alpha version

1 files changed, 77 insertions, 0 deletions

diff --git a/sys/src/cmd/cryptsetup/readcons.c b/sys/src/cmd/cryptsetup/readcons.c
new file mode 100644
index 000000000..cc2926cf0
--- /dev/null
+++ b/sys/src/cmd/cryptsetup/readcons.c
@@ -0,0 +1,77 @@
+/* From /sys/src/libauthsrv/readnvram.c, LPL licensed */
+#include <u.h>
+#include <libc.h>
+
+
+char*
+readcons(char *prompt, char *def, int raw, char *buf, int nbuf)
+{
+	int fdin, fdout, ctl, n, m;
+	char line[10];
+
+	fdin = open("/dev/cons", OREAD);
+	if(fdin < 0)
+		fdin = 0;
+	fdout = open("/dev/cons", OWRITE);
+	if(fdout < 0)
+		fdout = 1;
+	if(def != nil)
+		fprint(fdout, "%s[%s]: ", prompt, def);
+	else
+		fprint(fdout, "%s: ", prompt);
+	if(raw){
+		ctl = open("/dev/consctl", OWRITE);
+		if(ctl >= 0)
+			write(ctl, "rawon", 5);
+	} else
+		ctl = -1;
+
+	m = 0;
+	for(;;){
+		n = read(fdin, line, 1);
+		if(n == 0){
+			close(ctl);
+			werrstr("readcons: EOF");
+			return nil;
+		}
+		if(n < 0){
+			close(ctl);
+			werrstr("can't read cons");
+			return nil;
+		}
+		if(line[0] == 0x7f)
+			exits(0);
+		if(n == 0 || line[0] == '\n' || line[0] == '\r'){
+			if(raw){
+				write(ctl, "rawoff", 6);
+				write(fdout, "\n", 1);
+				close(ctl);
+			}
+			buf[m] = '\0';
+			if(buf[0]=='\0' && def)
+				strcpy(buf, def);
+			return buf;
+		}
+		if(line[0] == '\b'){
+			if(m > 0)
+				m--;
+		}else if(line[0] == 0x15){	/* ^U: line kill */
+			m = 0;
+			if(def != nil)
+				fprint(fdout, "%s[%s]: ", prompt, def);
+			else
+				fprint(fdout, "%s: ", prompt);
+		}else{
+			if(m >= nbuf-1){
+				fprint(fdout, "line too long\n");
+				m = 0;
+				if(def != nil)
+					fprint(fdout, "%s[%s]: ", prompt, def);
+				else
+					fprint(fdout, "%s: ", prompt);
+			}else
+				buf[m++] = line[0];
+		}
+	}
+}
+