feat: Add read timeout and error handling.

kilo.c

@@ -1,38 +1,64 @@
+/*** includes ***/
+
 #include <ctype.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <termios.h>
 #include <unistd.h>
 
+/*** data ***/
+
 struct termios orig_termios;
 
+/*** terminal ***/
+
+void die(const char* s) {
+    perror(s);
+    exit(1);
+}
+
 void disableRawMode() {
-    tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios);
+    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1)
+        die("tcsetattr");
 }
 
 void enableRawMode() {
-    tcgetattr(STDIN_FILENO, &orig_termios);
+    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 | IEXTEN | ISIG);
 
-    tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
+    // Sets timeouts for read()
+    raw.c_cc[VMIN] = 0;
+    raw.c_cc[VTIME] = 1;
+
+    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
+        die("tcsetattr");
 }
 
+/*** init ***/
+
 int main() {
     enableRawMode();
 
-    char c;
+    while(1) {
-    while(read(STDIN_FILENO, &c, 1) == 1 && c != 'q') {
+        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;
 }