Converted easysock from CPP to C, because it was mostly just C code anyways

easysock.c

@@ -1,8 +1,9 @@
-#include "includes/easysock.hpp"
-#include <cstring>
-#include <cstdlib>
-#include <cstdio>
-#include <cerrno>
+#include "includes/easysock.h"
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
 #include <fcntl.h>
 
 #ifndef _WIN32
@@ -187,6 +188,29 @@ int check_ip_ver(const char* address) {
 	}
 }
 
+int port_to_num(const char* port_str) {
+	/* The largest possible port value is 65535: a 5 character string */
+	if (strlen(port_str) > 5) {
+		return -1;
+	}
+	
+	for (int i = 0; i < strlen(port_str); i++) {
+		if (isdigit(port_str[i]) == 0) { // Ensure that every character in port_str is a digit (isidigit() returns 0 if the parameter is not a digit)
+			return -1;
+		}
+	}
+	/* Convert the string to a base-10 integer */
+	int port_num = (int)strtol(port_str, NULL, 10);
+	if (port_num > 65535) {
+		return -1;
+	}
+	if (port_num < 1024) {
+		return -2;	
+	}
+	
+	return port_num;
+}
+
 int int_to_inet(int network) {
 	if (network == 4) {
 		return AF_INET;

includes/easysock.h

@@ -1,5 +1,8 @@
-#ifndef EASYSOCK_HPP_
-#define EASYSOCK_HPP_
+#ifdef __cplusplus
+extern "C" {
+#endif
+#ifndef EASYSOCK_H_
+#define EASYSOCK_H_
 
 #ifdef _WIN32
 	#include <winsock2.h>
@@ -70,6 +73,12 @@ IPv6 address (returns 6) or neither (returns -1). */
 
 int check_ip_ver(const char* address);
 
+/* port_to_num - Converts a string representing a port, into a numeric value.
+Returns -1 if the string is not numeric, or exceeds the maximum port length.
+Returns -2 if the string is lower than 1024, This serves as a warning, as ports less
+than 1023 are reserved. */
+int port_to_num(const char* port_str);
+
 /* int_to_inet - Takes an int value (4 for IPv4, 6 for IPv6) and returns AF_INET or
 AF_INET6 respectively. */
 
@@ -92,3 +101,6 @@ int sock_quit(void);
 int sock_close(SOCKET);
 
 #endif
+#ifdef __cplusplus
+}
+#endif