Function: unibyte-string
unibyte-string is a function defined in character.c.
Signature
(unibyte-string &rest BYTES)
Documentation
Concatenate all the argument bytes and make the result a unibyte string.
Probably introduced at or before Emacs version 23.1.
Source Code
// Defined in /usr/src/emacs/src/character.c
{
Lisp_Object str = make_uninit_string (n);
unsigned char *p = SDATA (str);
for (ptrdiff_t i = 0; i < n; i++)
*p++ = check_integer_range (args[i], 0, 255);
return str;
}