miscutils/ascii.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2021 Denys Vlasenko <vda.linux@googlemail.com>
   4  *
   5  * Licensed under GPLv2, see file LICENSE in this source tree.
   6  */
   7 //config:config ASCII
   8 //config:       bool "ascii (784 bytes)"
   9 //config:       default y
  10 //config:       help
  11 //config:       Print ascii table.
  12 //config:
  13
  14 //applet:IF_ASCII(APPLET(ascii, BB_DIR_USR_BIN, BB_SUID_DROP))
  15
  16 //kbuild:lib-$(CONFIG_ASCII) += ascii.o
  17
  18 //usage:#define ascii_trivial_usage NOUSAGE_STR
  19 //usage:#define ascii_full_usage ""
  20
  21 #include "libbb.h"
  22
  23 int ascii_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  24 int ascii_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  25 {
  26         const char *ctrl =
  27                 "NUL""SOH""STX""ETX""EOT""ENQ""ACK""BEL"
  28                 "BS ""HT ""NL ""VT ""FF ""CR ""SO ""SI "
  29                 "DLE""DC1""DC2""DC3""DC4""NAK""SYN""ETB"
  30                 "CAN""EM ""SUB""ESC""FS ""GS ""RS ""US "
  31         ;
  32 //TODO: od has a similar table, can we reuse it?
  33         char last[2];
  34         unsigned i;
  35
  36         last[1] = '\0';
  37         printf("Dec Hex    Dec Hex    Dec Hex  Dec Hex  Dec Hex  Dec Hex   Dec Hex   Dec Hex\n");
  38         for (i = 0; i < 16; i++) {
  39                 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",
  40                         i+0x00, i+0x00, ctrl + i*3,
  41                         i+0x10, i+0x10, ctrl + i*3 + 16*3,
  42                         i+0x20, i+0x20, i+0x20,
  43                         i+0x30, i+0x30, i+0x30,
  44                         i+0x40, i+0x40, i+0x40,
  45                         i+0x50, i+0x50, i+0x50,
  46                         i+0x60, i+0x60, i+0x60,
  47                         i+0x70, i+0x70, (i+0x70 == 0x7f ? "DEL" : (last[0] = i+0x70, last))
  48                 );
  49         }
  50         return EXIT_SUCCESS;
  51 }