malloc, free, append

examples/hello.c

@@ -6,6 +6,23 @@ int main(void) {
     const char *version = escpos_version();
     
     printf("%s\n", version);
+
+    escpos_buffer *buffer = escpos_buffer_new();
+    if (buffer == NULL)
+    {
+        return 1;
+    }
+
+    for (int i = 0; i < 100; i++)
+    {
+       int err = escpos_buffer_append_byte(buffer, 'A');
+       if (err == -1) 
+       {
+            return 1;
+       }
+    }
+
+    escpos_buffer_free(buffer);
     
     return 0;
 }