added isatty.c: it is reasonably standard on UNIX systems

lang/cem/libcc.ansi/misc/.distr

@@ -8,6 +8,7 @@ getopt.c
 getpass.c
 getpw.c
 getw.c
+isatty.c
 opendir.c
 popen.c
 putenv.c

lang/cem/libcc.ansi/misc/Makefile

@@ -2,4 +2,4 @@ clean:
 	rm -f getgrent.o getopt.o getpass.o getpw.o getw.o putw.o putenv.o \
 		environ.o popen.o sleep.o termcap.o fdopen.o closedir.o \
 		getdents.o opendir.o readdir.o rewinddir.o seekdir.o \
-		telldir.o OLIST
+		telldir.o isatty.o OLIST

lang/cem/libcc.ansi/misc/isatty.c

@@ -0,0 +1,11 @@
+/*
+ * isatty - check if a file descriptor is associated with a terminal
+ */
+/* $Header$ */
+
+int _isatty(int d);
+
+int isatty(int d)
+{
+	return _isatty(d);
+}