Implement get_file_from_url

server/request_handling.c

@@ -1,4 +1,5 @@
 #include "request_handling.h"
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -78,3 +79,35 @@ int parse_request_line(const char *line, struct request_line *parsed_line) {
 
     return 0;
 }
+
+/**
+ * Gets a FILE from a given uri.
+ *
+ * @param uri The uri in the request line.
+ * @param req_file A pointer to a requested_file struct.
+ *
+ * @return -1 For an I/O error, 0 if successful.
+ */
+int get_file_from_url(const char *uri, struct requested_file *req_file) {
+    // If our uri starts with a slash, we can ignore it.
+    if (*uri == '/') {
+        uri++;
+    }
+    FILE *open_file = fopen(uri, "r");
+    if (open_file == NULL) {
+        return -1;
+    }
+    int seek_result = fseek(open_file, 0, SEEK_END);
+    if (seek_result != 0) {
+        return -1;
+    }
+    long size = ftell(open_file);
+    if (size == -1) {
+        return -1;
+    }
+    rewind(open_file);
+    req_file->size = size;
+    req_file->file = open_file;
+
+    return 0;
+}

server/request_handling.h

@@ -1,12 +1,20 @@
 #ifndef REQUEST_HANDLING_H
 #define REQUEST_HANDLING_H
 
+#include <stdio.h>
+
 struct request_line {
     char *http_version;
     char *method;
     char *uri;
 };
 
+struct requested_file {
+    long size;
+    FILE *file;
+};
+
 int parse_request_line(const char *line, struct request_line *parsed_line);
+int get_file_from_url(const char *uri, struct requested_file *req_file);
 
 #endif