shell escape function

[Tomas Hlavaty]

Hi,

in order to read graphics pdf and media on the console, I have the
following two functions:

(defun fbpdf (fname)
  (interactive "sFile name: ")
  (suspend-emacs (format "fbpdf -w '%s'; fg" (expand-file-name fname))))

(defun fbmpv (fname)
  (interactive "sFile name: ")
  (suspend-emacs (format "mpv --vo=drm '%s'; fg" (expand-file-name fname))))

I can use them as follows:

(fbpdf "~/Downloads/pdf/bad-is-stronger-than-good.pdf")
(fbmpv "~/Downloads/vid/how-complex.mkv")

Is there a function in emacs which escapes shell string, in this case
the filename?

I have not found anything so far.

Thanks in advance,

Tomas