Spent the five minutes to implement "cat".

diff --git a/toys/cat.c b/toys/cat.c
new file mode 100644 (file)
index 0000000..118aa60
--- /dev/null
+++ b/toys/cat.c
@@ -0,0 +1,38 @@
+/* vi: set sw=4 ts=4:
+ *
+ * hello.c - A hello world program.
+ *
+ * Copyright 2006 Rob Landley <rob@landley.net>
+ *
+ * See http://www.opengroup.org/onlinepubs/009695399/utilities/cat.html
+
+USE_CAT(NEWTOY(cat, "u", TOYFLAG_BIN))
+
+config CAT
+       bool "cat"
+       default y
+       help
+         usage: cat [-u] [file...]
+         Copy (concatenate) files to stdout.  If no files listed, copy from stdin.
+
+         -u    Copy one byte at a time (slow).
+*/
+
+#include "toys.h"
+
+static void do_cat(int fd, char *name)
+{
+       int len, size=toys.optflags ? 1 : sizeof(toybuf);
+
+       for (;;) {
+               len = xread(fd, toybuf, size);
+               if (len<0) toys.exitval = EXIT_FAILURE;
+               if (len<1) break;
+               xwrite(1, toybuf, size);
+       }
+}
+
+void cat_main(void)
+{
+       loopfiles(toys.optargs, do_cat);
+}