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Finally use __progname, err(3) and warn(3).
That's more readable and less error-prone than fumbling around
with argv[0], fprintf(3), strerror(3), perror(3), and exit(3).
It also shortens the code by 50 lines.

It's a bad idea to boycott good interfaces merely because standards
committees ignore them.  Instead, it's the job of the portable
distribution to provide compatibility modules for archaic systems
(like commercial Solaris) that still don't have them.  Actually,
the compat code for the portable distribution already exists and
will be committed right after this.

/*	$OpenBSD: mandoc_aux.c,v 1.6 2015/10/11 21:06:59 schwarze Exp $ */
/*
 * Copyright (c) 2009, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2014 Ingo Schwarze <schwarze@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <sys/types.h>

#include <err.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "mandoc.h"
#include "mandoc_aux.h"

int
mandoc_asprintf(char **dest, const char *fmt, ...)
{
	va_list	 ap;
	int	 ret;

	va_start(ap, fmt);
	ret = vasprintf(dest, fmt, ap);
	va_end(ap);

	if (ret == -1)
		err((int)MANDOCLEVEL_SYSERR, NULL);
	return ret;
}

void *
mandoc_calloc(size_t num, size_t size)
{
	void	*ptr;

	ptr = calloc(num, size);
	if (ptr == NULL)
		err((int)MANDOCLEVEL_SYSERR, NULL);
	return ptr;
}

void *
mandoc_malloc(size_t size)
{
	void	*ptr;

	ptr = malloc(size);
	if (ptr == NULL)
		err((int)MANDOCLEVEL_SYSERR, NULL);
	return ptr;
}

void *
mandoc_realloc(void *ptr, size_t size)
{

	ptr = realloc(ptr, size);
	if (ptr == NULL)
		err((int)MANDOCLEVEL_SYSERR, NULL);
	return ptr;
}

void *
mandoc_reallocarray(void *ptr, size_t num, size_t size)
{

	ptr = reallocarray(ptr, num, size);
	if (ptr == NULL)
		err((int)MANDOCLEVEL_SYSERR, NULL);
	return ptr;
}

char *
mandoc_strdup(const char *ptr)
{
	char	*p;

	p = strdup(ptr);
	if (ptr == NULL)
		err((int)MANDOCLEVEL_SYSERR, NULL);
	return p;
}

char *
mandoc_strndup(const char *ptr, size_t sz)
{
	char	*p;

	p = mandoc_malloc(sz + 1);
	memcpy(p, ptr, sz);
	p[(int)sz] = '\0';
	return p;
}