fix _ftello_r by wrapping it

Author: daniel-j

CMakeLists.txt

@@ -108,7 +108,7 @@ target_include_directories(filesystem_vfs INTERFACE
   ${CMAKE_CURRENT_LIST_DIR}/include
 )
 target_compile_options(filesystem_vfs INTERFACE -Werror -Wall -Wextra -Wnull-dereference)
-target_link_libraries(filesystem_vfs INTERFACE pico_sync)
+target_link_libraries(filesystem_vfs INTERFACE pico_sync -Wl,--wrap=_ftello_r)
 
 # Default file system library
 add_library(filesystem_default INTERFACE)

src/filesystem/fat.c

@@ -415,6 +415,29 @@ static int file_stat(filesystem_t *fs, const char *path, struct stat *st) {
     return 0;
 }
 
+static int file_utimes(filesystem_t *fs, const char *path, const struct timeval times[2]) {
+    filesystem_fat_context_t *context = fs->context;
+    char fpath[PATH_MAX];
+    fat_path_prefix(fpath, context->id, path);
+
+    struct tm *mtime = localtime(&times[0].tv_sec);
+
+    FILINFO f = {
+        .fdate = (WORD)(((mtime->tm_year - 80) * 512U) | mtime->tm_mon * 32U | mtime->tm_mday),
+        .ftime = (WORD)(mtime->tm_hour * 2048U | mtime->tm_min * 32U | mtime->tm_sec / 2U)
+    };
+
+    mutex_enter_blocking(&context->_mutex);
+    FRESULT res = f_utime(fpath, &f);
+    mutex_exit(&context->_mutex);
+
+    if (res != FR_OK) {
+        return fat_error_remap(res);
+    }
+
+    return 0;
+}
+
 static int file_open(filesystem_t *fs, fs_file_t *file, const char *path, int flags) {
     BYTE open_mode;
     if (flags & O_RDWR)