Added asynchronous demo which uses poll()

Makefile

@@ -15,11 +15,14 @@ ifeq ($(DEBUG),1)
   CFLAGS_DEBUG=-ggdb -DDEBUG
 endif
 
-all: demo
+all: demo demo-async
 
 demo: libtermkey.so demo.c
 	$(CC) $(CFLAGS) $(CFLAGS_DEBUG) -o $@ $^
 
+demo-async: libtermkey.so demo-async.c
+	$(CC) $(CFLAGS) $(CFLAGS_DEBUG) -o $@ $^
+
 libtermkey.so: termkey.o driver-csi.o driver-ti.o
 	$(LD) -shared -soname=$(SONAME) -o $@ $^ -lncurses
 

demo-async.c

@@ -0,0 +1,58 @@
+#include <poll.h>
+#include <stdio.h>
+
+#include "termkey.h"
+
+void on_key(termkey_t *tk, termkey_key *key)
+{
+  char buffer[50];
+  termkey_snprint_key(tk, buffer, sizeof buffer, key, TERMKEY_FORMAT_VIM);
+  printf("%s\n", buffer);
+}
+
+int main(int argc, char *argv[]) {
+  termkey_t *tk = termkey_new(0, 0);
+
+  if(!tk) {
+    fprintf(stderr, "Cannot allocate termkey instance\n");
+    exit(1);
+  }
+
+  struct pollfd fd;
+
+  fd.fd = 0; /* the file descriptor we passed to termkey_new() */
+  fd.events = POLLIN;
+
+  termkey_result ret;
+  termkey_key key;
+
+  int running = 1;
+  int nextwait = -1;
+
+  while(running) {
+    if(poll(&fd, 1, nextwait) == 0) {
+      // Timed out
+      if(termkey_getkey_force(tk, &key) == TERMKEY_RES_KEY)
+        on_key(tk, &key);
+    }
+
+    if(fd.revents & (POLLIN|POLLHUP|POLLERR))
+      termkey_advisereadable(tk);
+
+    while((ret = termkey_getkey(tk, &key)) == TERMKEY_RES_KEY) {
+      on_key(tk, &key);
+
+      if(key.type == TERMKEY_TYPE_UNICODE &&
+         key.modifiers & TERMKEY_KEYMOD_CTRL &&
+         (key.code.codepoint == 'C' || key.code.codepoint == 'c'))
+        running = 0;
+    }
+
+    if(ret == TERMKEY_RES_AGAIN)
+      nextwait = termkey_getwaittime(tk);
+    else
+      nextwait = -1;
+  }
+
+  termkey_destroy(tk);
+}