Add headers type

common/http_types.c

@@ -0,0 +1,52 @@
+#include "http_types.h"
+#include <stdlib.h>
+#include <string.h>
+
+/**
+ * Create a new header and append it to the end of the list of existing headers
+ *
+ * @param header_name The name of the header
+ * @param header_contents The contents of the header
+ * @param existing_header A list of existing headers that this new header should be append to.
+ *                        If NULL, no append will take place.
+ *
+ * @return The newly created header
+ */
+struct http_header *insert_header(const char *header_name, const char *header_value, struct http_header *existing_header) {
+    struct http_header *new_header = malloc(sizeof(struct http_header));
+    memset(new_header, 0, sizeof(struct http_header));
+
+    int name_length = strlen(header_name) + 1;
+    new_header->name = malloc(name_length * sizeof(char));
+    strcpy(new_header->name, header_name);
+
+    int contents_length = strlen(header_name) + 1;
+    new_header->value = malloc(contents_length * sizeof(char));
+    strcpy(new_header->value, header_value);
+
+    // If we have an existing header, append it to the end of our list of headers.
+    if (existing_header != NULL) {
+        struct http_header *cursor;
+        // Advance the cursor to the last non-null element
+        for (cursor = existing_header; cursor->next_header != NULL; cursor = cursor->next_header);
+        cursor->next_header = new_header;
+    }
+
+    return new_header;
+}
+
+/**
+ * Free all headers in a header list
+ *
+ * @param headers The list of headers to free
+ */
+void free_headers(struct http_header *headers) {
+    if (headers->next_header != NULL) {
+        free_headers(headers);
+    }
+
+    free(headers->name);
+    free(headers->value);
+    // next_header should have already been freed by recursion
+    free(headers);
+}

common/http_types.h

@@ -6,6 +6,17 @@ struct http_message {
     int port;
     char *path;
     char *contents;
+    char *start_line;
+    struct http_header *headers;
 };
 
+struct http_header {
+    char *name;
+    char *value;
+    struct http_header *next_header;
+};
+
+struct http_header *insert_header(const char *header_name, const char *header_value, struct http_header *existing_header);
+void free_headers(struct http_header *headers);
+
 #endif