diff toys/cat.c @ 279:0ca2fcee572b

Spent the five minutes to implement "cat".
author Rob Landley <rob@landley.net>
date Fri, 04 Apr 2008 12:19:21 -0500
parents
children 1c160cadf5b9
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toys/cat.c	Fri Apr 04 12:19:21 2008 -0500
@@ -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);
+}