add request handler for http request and response generation

Makefile

@@ -1,11 +1,14 @@
-all: webserver.o client_handler.o
-	gcc -o webserver.out webserver.o client_handler.o -lpthread
+all: webserver.o client_handler.o request_handler.o
+	gcc -o webserver.out *.o -lpthread
 
 webserver: webserver.c
 	gcc -c webserver webserver.c
 
-client_handler: client_handler.c
+client_handler: client_handler.c client_handler.h request_handler.h
 	gcc -c client_handler client_handler.c
 
+request_handler: request_handler.c request_handler.h
+	gcc -c request_handler request_handler.c
+
 clean:
 	rm -f *.o *.out

client_handler.c

@@ -1,5 +1,7 @@
 #include "client_handler.h"
 
+#include "request_handler.h"
+
 #define BUFFER_SIZE 1024
 
 void* client_handler(void* args) {
@@ -11,60 +13,15 @@ void* client_handler(void* args) {
         // Null terminate buffer
         buffer[bytes_read] = '\0';
 
-        // Check if request is GET
-        char* ptr = buffer;  // Modifiable pointer to buffer
-        char* buf_temp =
-            (char*)malloc(10);      // Temporary buffer to store request code
-        char* ptr_temp = buf_temp;  // Modifiable pointer to temporary buffer
-        // Copy request code to temporary buffer
-        while (*ptr != ' ') {
-            *ptr_temp = *ptr;
-            ptr++;
-            ptr_temp++;
-        }
-        // Null terminate temporary buffer
-        *ptr_temp = '\0';
-        ptr++;  // Skip over space
-        if (strcmp(buf_temp, "GET") == 0) {
-            printf("Received a GET request!!\n");
-        } else {
-            printf("Received a non-GET request!!\n");
-            return NULL;
-        }
+        char* response = (char*)malloc(BUFFER_SIZE);
+        size_t response_length = BUFFER_SIZE;
 
-        // Get filename
-        char* filename = (char*)malloc(100);  // Buffer to store filename
-        ptr_temp = filename;                  // Modifiable pointer to filename
-        *ptr_temp = '.';                      // Prepend . to filename
-        ptr_temp++;
-        // Copy filename to temporary buffer
-        while (*ptr != ' ') {
-            // Convert %20 to space
-            if (*ptr == '%' && *(ptr + 1) == '2' && *(ptr + 2) == '0') {
-                ptr += 3;
-                *ptr_temp = ' ';
-                ptr_temp++;
-            } else {
-                // Copy character
-                *ptr_temp = *ptr;
-                ptr++;
-                ptr_temp++;
-            }
-        }
-        *ptr_temp = '\0';  // Null terminate filename
-
-        // Print filename
-        printf("Filename: %s\n", filename);
+        handle_request(buffer, bytes_read, response, &response_length);
 
         // Send response
-        char* response = "HTTP/1.1 200 OK\n\n";
-        send(client, response, strlen(response), 0);
+        send(client, response, response_length, 0);
 
-        printf("Request:\n");
-        printf("%s\n", buffer);
-
-        free(buf_temp);
-        free(filename);
+        free(response);
         return NULL;
     }
     free(buffer);

request_handler.c

@@ -0,0 +1,78 @@
+
+#include "request_handler.h"
+
+void handle_request(char* request, int length, char* response,
+                    size_t* response_length) {
+    request[length] = '\0';  // Null terminate request for printing
+
+    printf("Request ---------\n");
+    printf("%s\n---------\n", request);
+
+    // Check if request is GET
+    char* ptr = request;  // Modifiable pointer to request
+    char buf_temp[10];    // Temporary buffer to store request code
+    char* ptr_temp =
+        (char*)&buf_temp;  // Modifiable pointer to temporary buffer
+    // Copy request code to temporary buffer
+    while (*ptr != ' ') {
+        *ptr_temp = *ptr;
+        ptr++;
+        ptr_temp++;
+    }
+    // Null terminate temporary buffer
+    *ptr_temp = '\0';
+    ptr++;  // Skip over space
+    if (strcmp(buf_temp, "GET") == 0) {
+        printf("Received a GET request!!\n");
+    } else {
+        printf("Received a non-GET request!!\n");
+        return;
+    }
+
+    // Get filename from request url
+    char filename[100];           // Buffer to store filename
+    ptr_temp = (char*)&filename;  // Modifiable pointer to filename
+    *ptr_temp = '.';              // Prepend . to filename
+    ptr_temp++;
+    // While loop to copy filename to temporary buffer
+    while (*ptr != ' ') {
+        // Convert %20 to space
+        if (*ptr == '%' && *(ptr + 1) == '2' && *(ptr + 2) == '0') {
+            ptr += 3;
+            *ptr_temp = ' ';
+            ptr_temp++;
+        } else {
+            // Copy character
+            *ptr_temp = *ptr;
+            ptr++;
+            ptr_temp++;
+        }
+    }
+    *ptr_temp = '\0';  // Null terminate filename
+
+    // Print filename
+    printf("Filename: %s\n", filename);
+
+    // Create reponse string
+    ptr_temp = response;
+    char* temp = "HTTP/1.1 200 OK\nContent-Type: text/html\n\n";
+    while (*temp != '\0') {
+        *ptr_temp = *temp;
+        ptr_temp++;
+        temp++;
+    }
+    // Put the filename in the html response
+    temp = filename;
+    while (*temp != '\0') {
+        *ptr_temp = *temp;
+        ptr_temp++;
+        temp++;
+    }
+
+    *ptr_temp = '\0';  // Null terminate response
+
+    printf("Response --------\n");
+    printf("%s\n--------\n", response);
+
+    *response_length = strlen(response);
+}

request_handler.h

@@ -0,0 +1,11 @@
+#ifndef HTTP_RESPONSE_BUILDER_H
+#define HTTP_RESPONSE_BUILDER_H
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+
+void handle_request(char* request, int length, char* response,
+                    size_t* response_length);
+
+#endif