1 files changed, 51 insertions, 0 deletions
diff --git a/miscutils/ascii.c b/miscutils/ascii.c
new file mode 100644
index 0000000..98c11fa
--- /dev/null
+++ b/miscutils/ascii.c
@@ -0,0 +1,51 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Copyright (C) 2021 Denys Vlasenko <vda.linux@googlemail.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+//config:config ASCII
+//config:	bool "ascii"
+//config:	default y
+//config:	help
+//config:	Print ascii table.
+//config:
+
+//applet:IF_ASCII(APPLET(ascii, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_ASCII) += ascii.o
+
+//usage:#define ascii_trivial_usage NOUSAGE_STR
+//usage:#define ascii_full_usage ""
+
+#include "libbb.h"
+
+int ascii_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int ascii_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
+{
+	const char *ctrl =
+		"NUL""SOH""STX""ETX""EOT""ENQ""ACK""BEL"
+		"BS ""HT ""NL ""VT ""FF ""CR ""SO ""SI "
+		"DLE""DC1""DC2""DC3""DC4""NAK""SYN""ETB"
+		"CAN""EM ""SUB""ESC""FS ""GS ""RS ""US "
+	;
+//TODO: od has a similar table, can we reuse it?
+	char last[2];
+	unsigned i;
+
+	last[1] = '\0';
+	printf("Dec Hex    Dec Hex    Dec Hex  Dec Hex  Dec Hex  Dec Hex   Dec Hex   Dec Hex\n");
+	for (i = 0; i < 16; i++) {
+		printf("%3u %02x %.3s%4u %02x %.3s%4u %02x %c%4u %02x %c%4u %02x %c%4u %02x %c%5u %02x %c%5u %02x %s\n",
+			i+0x00, i+0x00, ctrl + i*3,
+			i+0x10, i+0x10, ctrl + i*3 + 16*3,
+			i+0x20, i+0x20, i+0x20,
+			i+0x30, i+0x30, i+0x30,
+			i+0x40, i+0x40, i+0x40,
+			i+0x50, i+0x50, i+0x50,
+			i+0x60, i+0x60, i+0x60,
+			i+0x70, i+0x70, (i+0x70 == 0x7f ? "DEL" : (last[0] = i+0x70, last))
+		);
+	}
+	return EXIT_SUCCESS;
+}