x_escape
int x_escape(const char *, size_t, int (*)(const char *, size_t));
if (x_escape(words[i], strlen(words[i]), x_do_ins) < 0 ||
x_escape(words[0], nlen, x_do_ins);
if (x_escape(words[i], strlen(words[i]), x_vi_putbuf) != 0) {
rval = x_escape(match, match_len, x_vi_putbuf);