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Gnulib provides ‘quote’ and ‘quotearg’ modules to help with quoting text, such as file names, in messages to the user. Here’s an example of using ‘quote’:
#include <quote.h> ... error (0, errno, _("cannot change owner of %s"), quote (fname));
This differs from
error (0, errno, _("cannot change owner of '%s'"), fname);
quote escapes unusual characters in
fname, e.g., ‘'’ and control characters like ‘\n’.
However, a caveat:
quote reuses the storage that it returns.
Hence if you need more than one thing quoted at the same time, you
need to use
quote module is not suited for multithreaded applications.
In that case, you have to use
quotearg_alloc, defined in the
‘quotearg’ module, which is decidedly less convenient.