small demo for token reading

test/readhttp.c

@@ -0,0 +1,26 @@
+#include "stralloc.h"
+#include "buffer.h"
+#include "byte.h"
+
+/* this demonstrates the buffer_get_token_sa_pred interface;
+ * ishttp is the predicate that determines when buffer_get_token_sa_pred
+ * stops reading.  It is supposed to return 0 if the token is not
+ * complete and 1 if it is.  It can also return -1 to indicate an error,
+ * for example you could enforce a timeout here or limit the token size. */
+
+int ishttp(stralloc* sa) {
+  return (sa->len>4 && byte_equal(sa->s+sa->len-4,4,"\r\n\r\n"));
+}
+
+int main() {
+  stralloc sa;
+  int res;
+
+  stralloc_init(&sa);
+  res=buffer_get_token_sa_pred(buffer_0,&sa,ishttp);
+  buffer_puts(buffer_1,"buffer_get_token_sa_pred returned ");
+  buffer_putlong(buffer_1,res);
+  buffer_putsflush(buffer_1,".\n\n");
+  buffer_putsa(buffer_1,&sa);
+  buffer_flush(buffer_1);
+}