diff -r 3cfe65695a8c -r 36a7f2ea7d12 dav/error.c
--- a/dav/error.c	Thu Jul 20 21:16:19 2023 +0200
+++ b/dav/error.c	Thu Jul 20 21:55:45 2023 +0200
@@ -34,37 +34,41 @@
 #include "error.h"
 
 void print_resource_error(DavSession *sn, const char *path) {
+    print_resource_error_to_file(stderr, sn, path);
+}
+
+void print_resource_error_to_file(FILE *file, DavSession *sn, const char *path) {
     char *res_url = util_concat_path(sn->base_url, path);
     switch(sn->error) {
         default: {
-            fprintf(stderr, "Operation failed for resource %s.\n", res_url);
+            fprintf(file, "Operation failed for resource %s.\n", res_url);
             if(sn->errorstr) {
-                fprintf(stderr, "%s\n", sn->errorstr);
+                fprintf(file, "%s\n", sn->errorstr);
             }
             break;
         }
         case DAV_NOT_FOUND: {
-            fprintf(stderr, "Resource %s not found.\n", res_url);
+            fprintf(file, "Resource %s not found.\n", res_url);
             break;
         }
         case DAV_UNAUTHORIZED: {
-            fprintf(stderr, "Authentication required.\n");
+            fprintf(file, "Authentication required.\n");
             break;
         }
         case DAV_PROXY_AUTH_REQUIRED: {
-            fprintf(stderr, "Proxy authentication required.\n");
+            fprintf(file, "Proxy authentication required.\n");
             break;
         }
         case DAV_NET_AUTH_REQUIRED: {
-            fprintf(stderr, "Network authentication required.\n");
+            fprintf(file, "Network authentication required.\n");
             break;
         }
         case DAV_FORBIDDEN: {
-            fprintf(stderr, "Access forbidden.\n");
+            fprintf(file, "Access forbidden.\n");
             break;
         }
         case DAV_METHOD_NOT_ALLOWED: {
-            fprintf(stderr, "Method not allowed.\n");
+            fprintf(file, "Method not allowed.\n");
             break;
         }
         case DAV_CONFLICT: {
@@ -81,48 +85,48 @@
             break;
         }
         case DAV_UNSUPPORTED_PROTOCOL: {
-            fprintf(stderr, "Unsupported protocol.\n");
+            fprintf(file, "Unsupported protocol.\n");
             if(sn->errorstr) {
-                fprintf(stderr, "%s\n", sn->errorstr);
+                fprintf(file, "%s\n", sn->errorstr);
             }
             break;
         }
         case DAV_COULDNT_RESOLVE_PROXY: {
-            fprintf(stderr, "Cannot resolve proxy host.\n");
+            fprintf(file, "Cannot resolve proxy host.\n");
             break;
         }
         case DAV_COULDNT_RESOLVE_HOST: {
-            fprintf(stderr, "Cannot resolve host name.\n");
+            fprintf(file, "Cannot resolve host name.\n");
             break;
         }
         case DAV_COULDNT_CONNECT: {
-            fprintf(stderr, "Cannot connect to host.\n");
+            fprintf(file, "Cannot connect to host.\n");
             break;
         }
         case DAV_TIMEOUT: {
-            fprintf(stderr, "Operation timed out.\n");
+            fprintf(file, "Operation timed out.\n");
             break;
         }
         case DAV_SSL_ERROR: {
-            fprintf(stderr, "SSL error.\n");
+            fprintf(file, "SSL error.\n");
             if(sn->errorstr) {
-                fprintf(stderr, "%s\n", sn->errorstr);
+                fprintf(file, "%s\n", sn->errorstr);
             }
             break;
         }
         case DAV_CONTENT_VERIFICATION_ERROR: {
             fprintf(
-                    stderr,
+                    file,
                     "Content checksum verification failed for resource %s.\n",
                     res_url);
             break;
         }
         case DAV_REQUEST_ENTITY_TOO_LARGE: {
-            fprintf(stderr, "Request entity too large.\n");
+            fprintf(file, "Request entity too large.\n");
             break;
         }
         case DAV_REQUEST_URL_TOO_LONG: {
-            fprintf(stderr, "Request URL too long.\n");
+            fprintf(file, "Request URL too long.\n");
             break;
         }
     }