Rearranged the project to have src/ and build/ directories

This simplifies keeping everything clean.

src/util.h

@@ -0,0 +1,34 @@
+#ifndef __UTIL_H
+#define __UTIL_H
+
+#include <stdio.h>
+#include <pthread.h>
+
+void error_init();
+
+void error(int consult_errno, int close_socket, pthread_mutex_t* unlock, const char* format, ...);
+
+void* xrealloc(void* ptr, size_t size);
+
+void* xmalloc(size_t size);
+
+#ifndef DEBUG
+#  define debug(msg, ...)
+#else
+#  include <sys/times.h>
+#  define debug(msg, ...) fprintf(stderr, "%08x %4d: " msg "\n" , \
+     (int) pthread_self(), (int) clock(), ##__VA_ARGS__)
+#endif
+
+#define CLIENT_ERROR(msg, ...) \
+  error(0, client->socket, &client->serve->l_io, msg, ##__VA_ARGS__)
+#define CLIENT_ERROR_ON_FAILURE(test, msg, ...) \
+  if (test < 0) { error(1, client->socket, &client->serve->l_io, msg, ##__VA_ARGS__); }
+
+#define SERVER_ERROR(msg, ...) \
+  error(0, 0, NULL, msg, ##__VA_ARGS__)
+#define SERVER_ERROR_ON_FAILURE(test, msg, ...) \
+  if (test < 0) { error(1, 0, NULL, msg, ##__VA_ARGS__); }
+
+#endif
+