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(unibyte_char_to_multibyte): Use Vnonascii_translate_table.
(syms_of_charset): Defvar it.

(Vcharacter_unification_table_vector): New variable.
(syms_of_charset): Declare it as a Lisp symbol.  Declare a Lisp
variable min-composite-char.
(unify_char): Delete unnecessary codes.

(syms_of_charset): Initialize variable.

(unibyte_char_to_multibyte): New function.
(DEFAULT_NONASCII_INSERT_OFFSET): New macro definition.

(Fstring): Use make_multibyte_string.
(Fcompose_string): Likewise.
(Ffind_charset_string): Handle bytes vs chars in string.
Special case for single-byte strings.
(Fchars_in_string): Function deleted.
(Fstring): Renamed from Fconcat_chars.
Handle bytes vs chars in string.
(syms_of_charset): Corresponding changes.

(syms_of_charset): defsubr deleted.

(chars_in_text, str_cmpchar_id, Fcompose_string): Likewise.

(Fchar_boundary_p): Always return 0.
(Fchars_in_region): Just subtract the arguments.
(chars_in_text): New function.
(Ffind_charset_region): Scan in bytepos as well as charpos.

(syms_of_charset): Declare it as a Lisp function.

contains invalid multibyte-form.

enable-multibyte-characters.
(Fchars_in_region): Likewise.  Avoid error when the region ends in
the middle of a multibyte character.

(Fchar_valid_p): New function.
(syms_of_charset): Declare it as a Lisp function.

composite characters.

(syms_of_charset): Define Schars_in_region as a Lisp subroutine
instead of Scount_chars_region.

(Fcount_chars_region): New function.
(min, max): New macros.

table.

changed to (int *).

charsets from `char' to `int.
(find_charset_in_str): Likewize.

argument C is an invalid character code.
(Fconcat_chars): Use alloca instead of malloc.

(Fdefine_charset): Doc-string modified.
(find_charset_in_str): Add 4th arg TABLE which is a character
unification table.
(Ffind_charset_region): Add optional arg TABLE which is a
character unification table.
(Ffind_charset_string): Likewise.

Fsplit_char): Adjusted for the above change.

(str_cmpchar_id): Return -1 if we have no more room
for a new composite character.
(Fmake_char_internal): Docstring is moved to lisp/mule.el.