added three tests

lib/libc/tests/stdio/fgetln.c

@@ -0,0 +1,20 @@
+/*
+ * Tests fgetln(3) routine -- interactively.
+ * 
+ * Devin Reade, 1997.
+ * 
+ * $Id: fgetln.c,v 1.1 1997/07/27 23:50:59 gdr Exp $
+ */
+
+#include <stdio.h>
+
+int 
+main(int argc, char **argv) {
+  char *p;
+  size_t len;
+  
+  while ((p = fgetln(stdin, &len)) != NULL) {
+    printf("%d:%s", len, p);
+  }
+  return 0;
+}

lib/libc/tests/stdio/offsetof.c

@@ -0,0 +1,28 @@
+/*
+ * This shows the offset (expected and actual) of the _file member of
+ * struct FILE for the stdio package.
+ * 
+ * Devin Reade, 1997.
+ * 
+ * $Id: offsetof.c,v 1.1 1997/07/27 23:50:59 gdr Exp $
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+
+int main (int argc, char **argv) {
+
+#ifdef __ORCAC_VERSION
+  int version = __ORCAC_VERSION;
+#else
+  int version = 20;
+#endif
+  printf("the expected offsets are:\n");
+  printf("\tv2.0.x:\t\t28\n");
+  printf("\tv2.1.0:\t\t28\n");
+  printf("\tv2.1.1b2:\t30\n");
+  printf("for version %d, offsetof(_file) is %d\n", version,
+	 offsetof(FILE, _file));
+  
+  return 0;
+}

lib/libc/tests/stdio/showfds.c

@@ -0,0 +1,18 @@
+/*
+ * This shows the defined values for STDIN_FILENO, STDOUT_FILENO,
+ * and STDERR_FILENO.  These will differ for GNO and ORCA.
+ *
+ * Devin Reade, 1997.
+ *
+ * $Id: showfds.c,v 1.1 1997/07/27 23:50:59 gdr Exp $
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char **argv) {
+  printf("stdin:   %d %d\n", STDIN_FILENO, fileno(stdin));
+  printf("stdout:  %d %d\n", STDOUT_FILENO, fileno(stdout));
+  printf("stderr:  %d %d\n", STDERR_FILENO, fileno(stderr));
+  return 0;
+}