Add cat -v.

1 files changed, 60 insertions, 0 deletions

diff --git a/toys/catv.c b/toys/catv.c
new file mode 100644
index 00000000..3a36de6b
--- /dev/null
+++ b/toys/catv.c
@@ -0,0 +1,60 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * cat -v implementation for toybox
+ *
+ * Copyright (C) 2006 Rob Landley <rob@landley.net>
+ */
+
+/* See "Cat -v considered harmful" at
+ * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */
+
+#include "toys.h"
+
+int catv_main(void)
+{
+	int retval = 0, fd;
+	char **argv = toys.optargs;
+
+	toys.optflags^=4;
+
+	// Loop through files.
+
+	do {
+		// Read from stdin if there's nothing else to do.
+
+		fd = 0;
+		if (*argv && 0>(fd = xopen(*argv, O_RDONLY, 0))) retval = EXIT_FAILURE;
+		else for(;;) {
+			int i, res;
+
+			res = reread(fd, toybuf, sizeof(toybuf));
+			if (res < 0) retval = EXIT_FAILURE;
+			if (res < 1) break;
+			for (i=0; i<res; i++) {
+				char c=toybuf[i];
+
+				if (c > 126 && (toys.optflags & 4)) {
+					if (c == 127) {
+						printf("^?");
+						continue;
+					} else {
+						printf("M-");
+						c -= 128;
+					}
+				}
+				if (c < 32) {
+					if (c == 10) {
+					   if (toys.optflags & 1) putchar('$');
+					} else if (toys.optflags & (c==9 ? 2 : 4)) {
+						printf("^%c", c+'@');
+						continue;
+					}
+				}
+				putchar(c);
+			}
+		}
+		if (CFG_TOYS_FREE && fd) close(fd);
+	} while (*++argv);
+
+	return retval;
+}