+ default:
+ /* If we have a multibyte sequence, copy it until we reach
+ its end, find an error, or come back to the initial shift
+ state. For C-like styles, if the sequence has
+ unprintable characters, escape the whole sequence, since
+ we can't easily escape single characters within it. */
+ {
+ /* Length of multibyte sequence found so far. */
+ size_t m;
+
+ int printable;
+
+ if (unibyte_locale)
+ {
+ m = 1;
+ printable = ISPRINT (c);
+ }
+ else
+ {
+ mbstate_t mbstate;
+ memset (&mbstate, 0, sizeof mbstate);
+
+ m = 0;
+ printable = 1;
+ if (argsize == (size_t) -1)
+ argsize = strlen (arg);
+
+ do
+ {
+ wchar_t w;
+ size_t bytes = mbrtowc (&w, &arg[i + m],
+ argsize - (i + m), &mbstate);
+ if (bytes == 0)
+ break;
+ else if (bytes == (size_t) -1)
+ {
+ printable = 0;
+ break;
+ }
+ else if (bytes == (size_t) -2)
+ {
+ printable = 0;
+ while (i + m < argsize && arg[i + m])
+ m++;
+ break;
+ }
+ else
+ {
+ if (! iswprint (w))
+ printable = 0;
+ m += bytes;
+ }
+ }
+ while (! mbsinit (&mbstate));
+ }
+
+ if (1 < m || (backslash_escapes && ! printable))
+ {
+ /* Output a multibyte sequence, or an escaped
+ unprintable unibyte character. */
+ size_t ilim = i + m;
+
+ for (;;)
+ {
+ if (backslash_escapes && ! printable)
+ {
+ STORE ('\\');
+ STORE ('0' + (c >> 6));
+ STORE ('0' + ((c >> 3) & 7));
+ c = '0' + (c & 7);
+ }
+ if (ilim <= i + 1)
+ break;
+ STORE (c);
+ c = arg[++i];
+ }
+
+ goto store_c;
+ }
+ }