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The files mandoc.c and mandoc.h contained both specialised low-level
functions used for multiple languages (mdoc, man, roff), for example
mandoc_escape(), mandoc_getarg(), mandoc_eos(), and generic auxiliary
functions.  Split the auxiliaries out into their own file and header.
While here, do some #include cleanup.

/*	$Id: mandoc_aux.c,v 1.1 2014/03/21 22:17:01 schwarze Exp $ */
/*
 * Copyright (c) 2009, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * 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 <stdlib.h>
#include <stdio.h>
#include <string.h>

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

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

	ptr = calloc(num, size);
	if (NULL == ptr) {
		perror(NULL);
		exit((int)MANDOCLEVEL_SYSERR);
	}
	return(ptr);
}

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

	ptr = malloc(size);
	if (NULL == ptr) {
		perror(NULL);
		exit((int)MANDOCLEVEL_SYSERR);
	}
	return(ptr);
}

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

	ptr = realloc(ptr, size);
	if (NULL == ptr) {
		perror(NULL);
		exit((int)MANDOCLEVEL_SYSERR);
	}
	return(ptr);
}

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

	p = strdup(ptr);
	if (NULL == p) {
		perror(NULL);
		exit((int)MANDOCLEVEL_SYSERR);
	}
	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);
}