Finish chapter 2

.gitignore

@@ -0,0 +1,2 @@
+.nvim.lua
+kilo

Makefile

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+CCFLAGS := -Wall -Wextra -Wpedantic -Werror -std=c99
+
+kilo: kilo.c
+	$(CC) $(CCFLAGS) kilo.c -o kilo

kilo.c

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+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+
+
+struct termios orig_termios;
+
+
+void die(const char *s) {
+    perror(s);
+    exit(1);
+}
+
+void disable_raw_mode() {
+    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1)
+        die("tcsetattr");
+}
+
+void enable_raw_mode() {
+    if (tcgetattr(STDIN_FILENO, &orig_termios) == -1) die("tcgetattr");
+    atexit(disable_raw_mode);
+
+    struct termios raw = orig_termios;
+    raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
+    raw.c_oflag &= ~(OPOST);
+    raw.c_cflag |= (CS8);
+    raw.c_lflag &= ~(ECHO | ICANON | ISIG);
+    raw.c_cc[VMIN] = 0;
+    raw.c_cc[VTIME] = 1;
+
+    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr");
+}
+
+
+int main() {
+
+    enable_raw_mode();
+    while (1) {
+        char c = '\0';
+        if (read(STDIN_FILENO, &c, 1) == -1 && errno != EAGAIN) die("read");
+
+        if (iscntrl(c))
+            printf("%d\r\n", c);
+        else
+            printf("%d ('%c')\r\n", c, c);
+
+        if (c == 'q') break;
+    }
+
+    return 0;
+}