add socket snippet

Socket_snippet/socket.h

@@ -0,0 +1,56 @@
+/*
+ * This file is part of the socksnippet project.
+ * Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#ifndef SERSOCK_H__
+#define SERSOCK_H__
+
+// max & min TCP socket port number
+#define PORTN_MAX   (65535)
+#define PORTN_MIN   (1024)
+
+#define BUFLEN      (1024)
+// Max amount of connections
+#define MAXCLIENTS  (30)
+
+typedef enum{
+    RESULT_OK,      // all OK
+    RESULT_FAIL,    // failed running command
+    RESULT_BADVAL,  // bad key's value
+    RESULT_BADKEY,  // bad key
+    RESULT_SILENCE, // send nothing to client
+    RESULT_NUM
+} hresult;
+
+const char *hresult2str(hresult r);
+
+// fd - socket fd to send private messages, key, val - key and its value
+typedef hresult (*mesghandler)(int fd, const char *key, const char *val);
+
+typedef struct{
+    mesghandler handler;
+    const char *key;
+} handleritem;
+
+int start_socket(int server, char *path, int isnet);
+void sendmessage(int fd, const char *msg, int l);
+void sendstrmessage(int fd, const char *msg);
+
+int processData(int fd, handleritem *handlers, char *buf, int buflen);
+
+#endif // SERSOCK_H__