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Up to [local] / src / usr.bin / sort

Cleanup:
Delete handling of LC_COLLATE (which has no effect)
and delete support for non-ASCII single-byte encodings,
allowing to replace the condition byte_sort == 1
with sort_mb_cur_max == 1.
Since none of our single-byte character and string functions are
locale dependent, also zap inspection of LC_CTYPE while here.

For know, keep the code supporting multi-byte encodings
even though it is very ugly, it cannot be reached right now,
and we have no plans to enable it any time soon.

OK millert@ tb@

/*	$OpenBSD: bwstring.h,v 1.3 2019/05/15 09:07:46 schwarze Exp $	*/

/*-
 * Copyright (C) 2009 Gabor Kovesdan <gabor@FreeBSD.org>
 * Copyright (C) 2012 Oleg Moskalenko <mom040267@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if !defined(__BWSTRING_H__)
#define	__BWSTRING_H__

#include <stdbool.h>
#include <stdio.h>
#include <errno.h>
#include <wchar.h>

#include "mem.h"

static const size_t sort_mb_cur_max = 1;

/* wchar_t is of 4 bytes: */
#define	SIZEOF_WCHAR_STRING(LEN) ((LEN)*sizeof(wchar_t))

/*
 * Binary "wide" string
 */
struct bwstring {
	size_t				len;
	union
	{
		wchar_t		wstr[0];
		unsigned char	cstr[0];
	}				data;
};

struct reader_buffer {
	wchar_t			*fgetwln_z_buffer;
	size_t			 fgetwln_z_buffer_size;
};

typedef void *bwstring_iterator;

#define	BWSLEN(s) ((s)->len)

struct bwstring *bwsalloc(size_t sz);

size_t bwsrawlen(const struct bwstring *bws);
const void* bwsrawdata(const struct bwstring *bws);
void bws_setlen(struct bwstring *bws, size_t newlen);
size_t bws_memsize(const struct bwstring *bws);
double bwstod(struct bwstring *s0, bool *empty);
int bws_month_score(const struct bwstring *s0);

struct bwstring *ignore_leading_blanks(struct bwstring *str);
struct bwstring *ignore_nonprinting(struct bwstring *str);
struct bwstring *dictionary_order(struct bwstring *str);
struct bwstring *ignore_case(struct bwstring *str);

void bwsprintf(FILE*, struct bwstring*, const char *prefix, const char *suffix);
void bws_disorder_warnx(struct bwstring *s, const char *fn, size_t pos);

struct bwstring *bwsdup(const struct bwstring *s);
struct bwstring *bwssbdup(const wchar_t *str, size_t size);
struct bwstring *bwscsbdup(const unsigned char *str, size_t size);
void bwsfree(struct bwstring *s);
size_t bwscpy(struct bwstring *dst, const struct bwstring *src);
struct bwstring *bwsncpy(struct bwstring *dst, const struct bwstring *src, size_t size);
struct bwstring *bwsnocpy(struct bwstring *dst, const struct bwstring *src, size_t offset, size_t size);
int bwscmp(const struct bwstring *bws1, const struct bwstring *bws2, size_t offset);
int bwsncmp(const struct bwstring *bws1, const struct bwstring *bws2, size_t offset, size_t len);
int bwscoll(const struct bwstring *bws1, const struct bwstring *bws2, size_t offset);
size_t bwsfwrite(struct bwstring *bws, FILE *f, bool zero_ended);
struct bwstring *bwsfgetln(FILE *file, size_t *len, bool zero_ended, struct reader_buffer *rb);

static inline bwstring_iterator
bws_begin(struct bwstring *bws)
{

	return (bwstring_iterator) (&(bws->data));
}

static inline bwstring_iterator
bws_end(struct bwstring *bws)
{

	return ((sort_mb_cur_max == 1) ?
	    (bwstring_iterator) (bws->data.cstr + bws->len) :
	    (bwstring_iterator) (bws->data.wstr + bws->len));
}

static inline bwstring_iterator
bws_iterator_inc(bwstring_iterator iter, size_t pos)
{

	if (sort_mb_cur_max == 1)
		return ((unsigned char *) iter) + pos;
	else
		return ((wchar_t*) iter) + pos;
}

static inline wchar_t
bws_get_iter_value(bwstring_iterator iter)
{

	if (sort_mb_cur_max == 1)
		return *((unsigned char *) iter);
	else
		return *((wchar_t*) iter);
}

int
bws_iterator_cmp(bwstring_iterator iter1, bwstring_iterator iter2, size_t len);

#define	BWS_GET(bws, pos) ((sort_mb_cur_max == 1) ? ((bws)->data.cstr[(pos)]) : (bws)->data.wstr[(pos)])

void initialise_months(void);

#endif /* __BWSTRING_H__ */