Add true and false.

toys/Config.in

@@ -77,6 +77,13 @@ config ECHO
 		\r	carriage return
 		\t	horizontal tab
 		\v	vertical tab
+
+config FALSE
+	bool "false"
+	default n
+	help
+	  Return nonzero.
+
 config HELLO
 	bool "hello"
 	default n
@@ -350,6 +357,12 @@ config TOYSH_BUILTINS
 	  Adds the commands exec, fg, bg, help, jobs, pwd, export, source, set,
 	  unset, read, alias.
 
+config TRUE
+	bool "true"
+	default n
+	help
+	  Return zero.
+
 config WHICH
 	bool "which"
 	default n

toys/false.c

@@ -0,0 +1,11 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * false.c - Return nonzero.
+ */
+
+#include "toys.h"
+
+int false_main(void)
+{
+	return 1;
+}

toys/toylist.h

@@ -90,6 +90,7 @@ USE_TOYSH(NEWTOY(cd, NULL, TOYFLAG_NOFORK))
 USE_DF(NEWTOY(df, "Pkt*a", TOYFLAG_USR|TOYFLAG_SBIN))
 USE_ECHO(NEWTOY(echo, "+en", TOYFLAG_BIN))
 USE_TOYSH(NEWTOY(exit, NULL, TOYFLAG_NOFORK))
+USE_FALSE(NEWTOY(false, NULL, TOYFLAG_BIN))
 USE_HELLO(NEWTOY(hello, NULL, TOYFLAG_USR))
 USE_MKE2FS(NEWTOY(mke2fs, MKE2FS_OPTSTRING, TOYFLAG_SBIN))
 USE_ONEIT(NEWTOY(oneit, "+<1p", TOYFLAG_SBIN))
@@ -99,5 +100,6 @@ USE_TOYSH(OLDTOY(sh, toysh, "c:i", TOYFLAG_BIN))
 USE_SYNC(NEWTOY(sync, NULL, TOYFLAG_BIN))
 USE_TOUCH(NEWTOY(touch, "l#t:r:mca", TOYFLAG_BIN))
 USE_TOYSH(NEWTOY(toysh, "c:i", TOYFLAG_BIN))
+USE_TRUE(NEWTOY(true, NULL, TOYFLAG_BIN))
 USE_WHICH(NEWTOY(which, "a", TOYFLAG_USR|TOYFLAG_BIN))
 USE_YES(NEWTOY(yes, "", TOYFLAG_USR|TOYFLAG_BIN))

toys/true.c

@@ -0,0 +1,11 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * true.c - Return zero.
+ */
+
+#include "toys.h"
+
+int true_main(void)
+{
+	return 0;
+}