Add some basic argparsing

client/http_client.c

@@ -0,0 +1,51 @@
+#include "http_client.h"
+#include "../common/http_message.h"
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char* argv[]) {
+    bool print_rtt = false;
+    if (argc == 1) {
+        printf("%s", USAGE_STRING);
+        return 1;
+    }
+    for (int i = 0; i < argc; i++) {
+        if (strcmp(argv[i], RTT_FLAG) == 0) {
+            print_rtt = true;
+        }
+    }
+    if ((print_rtt && argc != 4) || (!print_rtt && argc != 3)) {
+        printf("%s", USAGE_STRING);
+        return 1;
+    }
+    char *dest = argv[argc - 2];
+    char *port = argv[argc - 1];
+    char *path_buffer = malloc(strlen(dest) + 1);
+    char *host_buffer = malloc(strlen(dest) + 1);
+    get_parts(dest, path_buffer, host_buffer);
+    printf("%s\n%s\n", path_buffer, host_buffer);
+    free(host_buffer);
+    free(path_buffer);
+}
+
+/**
+ * Get the parts of a url
+ *
+ * @param dest The destination specified by the user
+ * @param path_buffer A buffer large enough to hold the path of the dest
+ * @param host_buffer A buffer large enough to hold the host of the dest
+ */
+void get_parts(const char *dest, char *path_buffer, char *host_buffer) {
+    char *slash_cursor;
+    for (slash_cursor = dest; *slash_cursor != '\0' && *slash_cursor != '/'; slash_cursor++);
+
+    if (*slash_cursor == '\0') {
+        strcpy(path_buffer, "/");
+        strcpy(host_buffer, dest);
+        return;
+    }
+    strcpy(path_buffer, slash_cursor);
+    strncpy(host_buffer, dest, slash_cursor - dest);
+}

client/http_client.h

@@ -0,0 +1,9 @@
+#ifndef HTTP_CLIENT_H
+#define HTTP_CLIENT_H
+
+#define RTT_FLAG "-p"
+#define USAGE_STRING "Usage: ./http_client [-p] server_url port_number\n"
+
+void get_parts(const char *dest, char *path_buffer, char *host_buffer);
+
+#endif