[enhancement] Client_server folder code updated for windows OS as well. (#577)

* update codes to run on Windows platform as well

* added cmake for client_server

* added scope parameters

* force use of unistd.h in non-windows

* use size_t instead of int

* use unsigned int instead of size_t

* clang-tidy fixes for ac0991eb51

* updated UDP server-client as well

* use unsigned int

* added documentation

* spell correction

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

CMakeLists.txt

@@ -30,6 +30,7 @@ add_subdirectory(sorting)
 add_subdirectory(graphics)
 add_subdirectory(searching)
 add_subdirectory(conversions)
+add_subdirectory(client_server)
 add_subdirectory(project_euler)
 add_subdirectory(machine_learning)
 add_subdirectory(numerical_methods)

client_server/CMakeLists.txt

@@ -0,0 +1,45 @@
+# include(CheckIncludeFile)
+# check_include_file(arpa/inet.h ARPA_HEADERS)
+# if(NOT ARPA_HEADERS)
+#     check_include_file(winsock2.h WINSOCK_HEADER)
+#     if(NOT WINSOCK_HEADER)
+#         message(FATAL_ERROR "socket headers not found in system.")
+#     endif()
+# endif()
+
+# check_include_file(unistd.h HAS_UNISTD)
+
+# If necessary, use the RELATIVE flag, otherwise each source file may be listed
+# with full pathname. RELATIVE may makes it easier to extract an executable name
+# automatically.
+file( GLOB APP_SOURCES RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.c )
+# file( GLOB APP_SOURCES ${CMAKE_SOURCE_DIR}/*.c )
+# AUX_SOURCE_DIRECTORY(${CMAKE_CURRENT_SOURCE_DIR} APP_SOURCES)
+foreach( testsourcefile ${APP_SOURCES} )
+    # I used a simple string replace, to cut off .cpp.
+    string( REPLACE ".c" "" testname ${testsourcefile} )
+    add_executable( ${testname} ${testsourcefile} )
+    
+    if(OpenMP_C_FOUND)
+        target_link_libraries(${testname} PRIVATE OpenMP::OpenMP_C)
+    endif()
+    if(MATH_LIBRARY)
+        target_link_libraries(${testname} PRIVATE ${MATH_LIBRARY})
+    endif()
+    
+    if(HAS_UNISTD)
+        target_compile_definitions(${testname} PRIVATE HAS_UNISTD)
+    endif()
+    # if(ARPA_HEADERS)
+    #     target_compile_definitions(${testname} PRIVATE ARPA_HEADERS)
+    # else()
+    #     target_compile_definitions(${testname} PRIVATE WINSOCK_HEADER)
+    # endif()
+
+    if(WIN32)
+        target_link_libraries(${testname} PRIVATE ws2_32)   # link winsock library on windows
+    endif()
+
+    install(TARGETS ${testname} DESTINATION "bin/client_server")
+
+endforeach( testsourcefile ${APP_SOURCES} )

client_server/client.c

@@ -1,14 +1,39 @@
-// Write CPP code here
-#include <arpa/inet.h>
-#include <netdb.h>
+/**
+ * @file
+ * @author [Nairit11](https://github.com/Nairit11)
+ * @author [Krishna Vedala](https://github.com/kvedala)
+ * @brief Client side implementation of Server-Client system.
+ * @see client_server/server.c
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+
+#ifdef _WIN32                            // if compiling for Windows
+#define _WINSOCK_DEPRECATED_NO_WARNINGS  // will make the code invalid for next
+                                         // MSVC compiler versions
+#include <winsock2.h>
+#define bzero(b, len) \
+    (memset((b), '\0', (len)), (void)0) /**< BSD name not in windows */
+#define read(a, b, c) recv(a, b, c, 0)  /**< map BSD name to Winsock */
+#define write(a, b, c) send(a, b, c, 0) /**< map BSD name to Winsock */
+#define close closesocket               /**< map BSD name to Winsock */
+#else                                   // if not windows platform
+#include <arpa/inet.h>
+#include <netdb.h>
 #include <sys/socket.h>
 #include <unistd.h>
-#define MAX 80
-#define PORT 8080
-#define SA struct sockaddr
+#endif
+
+#define MAX 80             /**< max. characters per message */
+#define PORT 8080          /**< port number to connect to */
+#define SA struct sockaddr /**< shortname for sockaddr */
+
+/**
+ * Continuous loop to send and receive over the socket.
+ * Exits when "exit" is sent from commandline.
+ * @param sockfd socket handle number
+ */
 void func(int sockfd)
 {
     char buff[MAX];
@@ -19,7 +44,9 @@ void func(int sockfd)
         printf("Enter the string : ");
         n = 0;
         while ((buff[n++] = getchar()) != '\n')
+        {
             ;
+        }
         write(sockfd, buff, sizeof(buff));
         bzero(buff, sizeof(buff));
         read(sockfd, buff, sizeof(buff));
@@ -32,12 +59,32 @@ void func(int sockfd)
     }
 }
 
+#ifdef _WIN32
+/** Cleanup function will be automatically called on program exit */
+void cleanup() { WSACleanup(); }
+#endif
+
+/**
+ * @brief Driver code
+ */
 int main()
 {
+#ifdef _WIN32
+    // when using winsock2.h, startup required
+    WSADATA wsData;
+    if (WSAStartup(MAKEWORD(2, 2), &wsData) != 0)
+    {
+        perror("WSA Startup error: \n");
+        return 0;
+    }
+
+    atexit(cleanup);  // register at-exit function
+#endif
+
     int sockfd, connfd;
     struct sockaddr_in servaddr, cli;
 
-    // socket create and varification
+    // socket create and verification
     sockfd = socket(AF_INET, SOCK_STREAM, 0);
     if (sockfd == -1)
     {
@@ -45,7 +92,9 @@ int main()
         exit(0);
     }
     else
+    {
         printf("Socket successfully created..\n");
+    }
     bzero(&servaddr, sizeof(servaddr));
 
     // assign IP, PORT
@@ -60,11 +109,14 @@ int main()
         exit(0);
     }
     else
+    {
         printf("connected to the server..\n");
+    }
 
     // function for chat
     func(sockfd);
 
     // close the socket
     close(sockfd);
+    return 0;
 }

client_server/server.c

@@ -1,16 +1,49 @@
-#include <netdb.h>
-#include <netinet/in.h>
+/**
+ * @file
+ * @author [Nairit11](https://github.com/Nairit11)
+ * @author [Krishna Vedala](https://github.com/kvedala)
+ * @brief Server side implementation of Server-Client system.
+ * @see client_server/client.c
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/socket.h>
-#include <sys/types.h>
-#include <unistd.h>
-#define MAX 80
-#define PORT 8080
-#define SA struct sockaddr
 
-// Function designed for chat between client and server.
+// #ifdef HAS_UNISTD
+// #include <unistd.h>
+// #endif
+
+#ifdef _WIN32
+#define _WINSOCK_DEPRECATED_NO_WARNINGS  // will make the code invalid for next
+                                         // MSVC compiler versions
+#include <winsock2.h>
+#define bzero(b, len) \
+    (memset((b), '\0', (len)), (void)0) /**< BSD name not in windows */
+#define read(a, b, c) recv(a, b, c, 0)  /**< map BSD name to Winsock */
+#define write(a, b, c) send(a, b, c, 0) /**< map BSD name to Winsock */
+#define close closesocket               /**< map BSD name to Winsock */
+#else
+// if not windows platform
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#endif
+
+#define MAX 80             /**< max. characters per message */
+#define PORT 8080          /**< port number to connect to */
+#define SA struct sockaddr /**< shortname for sockaddr */
+
+#ifdef _WIN32
+/** Cleanup function will be automatically called on program exit */
+void cleanup() { WSACleanup(); }
+#endif
+
+/**
+ * Continuous loop to send and receive over the socket.
+ * Exits when "exit" is sent from commandline.
+ * @param sockfd socket handle number
+ */
 void func(int sockfd)
 {
     char buff[MAX];
@@ -28,7 +61,9 @@ void func(int sockfd)
         n = 0;
         // copy server message in the buffer
         while ((buff[n++] = getchar()) != '\n')
+        {
             ;
+        }
 
         // and send that buffer to client
         write(sockfd, buff, sizeof(buff));
@@ -42,21 +77,36 @@ void func(int sockfd)
     }
 }
 
-// Driver function
+/** Driver code */
 int main()
 {
-    int sockfd, connfd, len;
+#ifdef _WIN32
+    // when using winsock2.h, startup required
+    WSADATA wsData;
+    if (WSAStartup(MAKEWORD(2, 2), &wsData) != 0)
+    {
+        perror("WSA Startup error: \n");
+        return 0;
+    }
+
+    atexit(cleanup);  // register at-exit function
+#endif
+
+    int sockfd, connfd;
+    unsigned int len;
     struct sockaddr_in servaddr, cli;
 
     // socket create and verification
     sockfd = socket(AF_INET, SOCK_STREAM, 0);
     if (sockfd == -1)
     {
-        printf("socket creation failed...\n");
+        perror("socket creation failed...\n");
         exit(0);
     }
     else
+    {
         printf("Socket successfully created..\n");
+    }
     bzero(&servaddr, sizeof(servaddr));
 
     // assign IP, PORT
@@ -67,35 +117,42 @@ int main()
     // Binding newly created socket to given IP and verification
     if ((bind(sockfd, (SA *)&servaddr, sizeof(servaddr))) != 0)
     {
-        printf("socket bind failed...\n");
+        perror("socket bind failed...\n");
         exit(0);
     }
     else
+    {
         printf("Socket successfully binded..\n");
+    }
 
     // Now server is ready to listen and verification
     if ((listen(sockfd, 5)) != 0)
     {
-        printf("Listen failed...\n");
+        perror("Listen failed...\n");
         exit(0);
     }
     else
+    {
         printf("Server listening..\n");
+    }
     len = sizeof(cli);
 
     // Accept the data packet from client and verification
     connfd = accept(sockfd, (SA *)&cli, &len);
     if (connfd < 0)
     {
-        printf("server acccept failed...\n");
+        perror("server acccept failed...\n");
         exit(0);
     }
     else
+    {
         printf("server acccept the client...\n");
+    }
 
     // Function for chatting between client and server
     func(connfd);
 
     // After chatting close the socket
     close(sockfd);
+    return 0;
 }

client_server/udp_client.c

@@ -1,19 +1,51 @@
-// Client side implementation of UDP client-server model
+/**
+ * @file
+ * @author [TheShubham99](https://github.com/TheShubham99)
+ * @author [Krishna Vedala](https://github.com/kvedala)
+ * @brief Client side implementation of UDP client-server model
+ * @see client_server/udp_server.c
+ */
+#ifdef _WIN32                            // if compiling for Windows
+#define _WINSOCK_DEPRECATED_NO_WARNINGS  // will make the code invalid for next
+                                         // MSVC compiler versions
+#include <winsock2.h>
+#define close closesocket /**< map BSD name to Winsock */
+#else                     // if not windows platform
 #include <arpa/inet.h>
+#include <netdb.h>
 #include <netinet/in.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <unistd.h>
+#endif
 
-#define PORT 8080
-#define MAXLINE 1024
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
-// Driver code
+#define PORT 8080    /**< port number to connect to */
+#define MAXLINE 1024 /**< maximum characters per line */
+
+#ifdef _WIN32
+/** Cleanup function will be automatically called on program exit */
+void cleanup() { WSACleanup(); }
+#endif
+
+/** Driver code */
 int main()
 {
+#ifdef _WIN32
+    // when using winsock2.h, startup required
+    WSADATA wsData;
+    if (WSAStartup(MAKEWORD(2, 2), &wsData) != 0)
+    {
+        perror("WSA Startup error: \n");
+        return 0;
+    }
+
+    atexit(cleanup);  // register at-exit function
+#endif
+
     int sockfd;
     char buffer[MAXLINE];
     char *hello = "Hello from client";
@@ -33,9 +65,10 @@ int main()
     servaddr.sin_port = htons(PORT);
     servaddr.sin_addr.s_addr = INADDR_ANY;
 
-    int n, len;
+    int n;
+    unsigned int len;
 
-    sendto(sockfd, (const char *)hello, strlen(hello), MSG_CONFIRM,
+    sendto(sockfd, (const char *)hello, strlen(hello), 0,
            (const struct sockaddr *)&servaddr, sizeof(servaddr));
     printf("Hello message sent.\n");
 

client_server/udp_server.c

@@ -1,19 +1,51 @@
-// Server side implementation of UDP client-server model
+/**
+ * @file
+ * @author [TheShubham99](https://github.com/TheShubham99)
+ * @author [Krishna Vedala](https://github.com/kvedala)
+ * @brief Server side implementation of UDP client-server model
+ * @see client_server/udp_client.c
+ */
+#ifdef _WIN32                            // if compiling for Windows
+#define _WINSOCK_DEPRECATED_NO_WARNINGS  // will make the code invalid for next
+                                         // MSVC compiler versions
+#define close closesocket                /**< map BSD name to Winsock */
+#include <winsock2.h>
+#else  // if not windows platform
 #include <arpa/inet.h>
+#include <netdb.h>
 #include <netinet/in.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <unistd.h>
+#endif
 
-#define PORT 8080
-#define MAXLINE 1024
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
-// Driver code
+#define PORT 8080    /**< port number to connect to */
+#define MAXLINE 1024 /**< maximum characters per line */
+
+#ifdef _WIN32
+/** Cleanup function will be automatically called on program exit */
+void cleanup() { WSACleanup(); }
+#endif
+
+/** Driver code */
 int main()
 {
+#ifdef _WIN32
+    // when using winsock2.h, startup required
+    WSADATA wsData;
+    if (WSAStartup(MAKEWORD(2, 2), &wsData) != 0)
+    {
+        perror("WSA Startup error: \n");
+        return 0;
+    }
+
+    atexit(cleanup);  // register at-exit function
+#endif
+
     int sockfd;
     char buffer[MAXLINE];
     char *hello = "Hello from server";
@@ -41,14 +73,17 @@ int main()
         exit(EXIT_FAILURE);
     }
 
-    int len, n;
+    unsigned int len;
+    int n;
     n = recvfrom(sockfd, (char *)buffer, MAXLINE, MSG_WAITALL,
                  (struct sockaddr *)&cliaddr, &len);
     buffer[n] = '\0';
     printf("Client : %s\n", buffer);
-    sendto(sockfd, (const char *)hello, strlen(hello), MSG_CONFIRM,
+    sendto(sockfd, (const char *)hello, strlen(hello), 0,
            (const struct sockaddr *)&cliaddr, len);
     printf("Hello message sent.\n");
 
+    close(sockfd);
+
     return 0;
 }