69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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/* entry_term contains a snapshot of the termios settings at startup. */
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struct termios entry_term;
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/*
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* A text editor needs the terminal to be in raw mode; but the default
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* is to be in canonical (cooked) mode, which is a buffered input mode.
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*/
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static void
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enable_termraw()
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{
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struct termios raw;
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/* Read the current terminal parameters for standard input. */
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tcgetattr(STDIN_FILENO, &raw);
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/*
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* Turn off the local ECHO mode, which we need to do in raw mode
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* because what gets displayed is going to need extra control.
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*
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* NOTE(kyle): look into cfmakeraw, which will require
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* snapshotting.
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*/
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raw.c_lflag &= ~(ECHO|ICANON);
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/*
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* Now write the terminal parameters to the current terminal,
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* after flushing any waiting input out.
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*/
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tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
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}
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static void
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disable_termraw()
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{
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tcsetattr(STDIN_FILENO, TCSAFLUSH, &entry_term);
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}
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int
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main()
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{
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char c;
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/* prepare the terminal */
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tcgetattr(STDIN_FILENO, &entry_term);
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atexit(disable_termraw);
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enable_termraw();
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while (read(STDIN_FILENO, &c, 1) == 1 && c != 'q') {
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if (iscntrl(c)) {
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printf("%02x\n", c);
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} else {
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printf("%02x ('%c')\n", c, c);
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}
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}
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return 0;
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}
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