project architecture

main.c

@@ -0,0 +1,89 @@
+#include "main.h"
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+
+/* defines */
+#define CTRL_KEY(k) ((k) & 0x1f)
+
+/* data */
+struct termios orig_termios;
+
+/* terminal */
+
+void die(const char *s) {
+  wipeScreen();
+  perror(s);
+  exit(1);
+}
+
+void disableRawMode() {
+  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1) {
+    die("tcsetattr");
+  }
+}
+
+void enableRawMode() {
+  if (tcgetattr(STDIN_FILENO, &orig_termios) == -1) {
+    die("tcgetattr");
+  }
+  atexit(disableRawMode);
+
+  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 | IEXTEN);
+  raw.c_cc[VMIN] = 0;
+  raw.c_cc[VTIME] = 1;
+
+  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) {
+    die("tcgetattr");
+  }
+}
+
+char editorReadKey() {
+  int nread;
+  char c;
+  while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
+    if (nread == -1 && errno != EAGAIN) {
+      die("read");
+    }
+  }
+  return c;
+}
+
+/* output */
+
+void wipeScreen() {
+  /* Clear the screen */
+  write(STDOUT_FILENO, "\x1b[2J", 4);
+  /* Put the cursor at the top left corner */
+  write(STDOUT_FILENO, "\x1b[H", 3);
+}
+
+/* input */
+void editorProcessKeypress() {
+  char c = editorReadKey();
+
+  switch (c) {
+  case CTRL_KEY('q'):
+    exit(0);
+    break;
+  }
+}
+
+/* init */
+
+int main() {
+
+  enableRawMode();
+
+  while (1) {
+    wipeScreen();
+    editorProcessKeypress();
+  }
+  return 0;
+}