From 1f742d521cd989642fcd155519019967dd2447f0 Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Sat, 19 Nov 2016 21:22:29 +0100
Subject: [PATCH] Add ptsname(3).

---
 libc/Makefile         |  1 +
 libc/include/stdlib.h |  2 +-
 libc/stdlib/ptsname.c | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 libc/stdlib/ptsname.c

diff --git a/libc/Makefile b/libc/Makefile
index f6734389..f1094961 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -537,6 +537,7 @@ stdlib/mkstemp.o \
 stdlib/mkstemps.o \
 stdlib/on_exit.o \
 stdlib/posix_openpt.o \
+stdlib/ptsname.o \
 stdlib/rand.o \
 stdlib/realpath.o \
 stdlib/setenv.o \
diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index e7d10840..f7abebfb 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -158,7 +158,6 @@ long lrand48(void);
 long mrand48(void);
 long nrand48(unsigned short[3]);
 int posix_memalign(void**, size_t, size_t);
-char* ptsname(int);
 long random(void);
 int rand_r(unsigned *);
 unsigned short *seed48(unsigned short [3]);
@@ -171,6 +170,7 @@ void srandom(unsigned);
 #if __USE_SORTIX || __USE_XOPEN
 int grantpt(int);
 int unlockpt(int);
+char* ptsname(int);
 #endif
 
 #if __USE_SORTIX || 600 <= __USE_XOPEN
diff --git a/libc/stdlib/ptsname.c b/libc/stdlib/ptsname.c
new file mode 100644
index 00000000..a52e90c9
--- /dev/null
+++ b/libc/stdlib/ptsname.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2016 Jonas 'Sortie' Termansen.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * unistd/ptsname.c
+ * Returns the path of a pseudoterminal master's slave.
+ */
+
+#include <sys/ioctl.h>
+
+#include <limits.h>
+#include <stdlib.h>
+
+#if !defined(TTY_NAME_MAX)
+#include <sortix/limits.h>
+#endif
+
+char* ptsname(int fd)
+{
+	static char name[TTY_NAME_MAX+1];
+	name[0] = '/';
+	name[1] = 'd';
+	name[2] = 'e';
+	name[3] = 'v';
+	name[4] = '/';
+	if ( ioctl(fd, TIOCGNAME, name + 5) < 0 )
+		return NULL;
+	return name;
+}