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fork our code we shared between openrcs/cvs into the openrcs dir.

this was starting to become inhuman to maintain without
ugly ugly hacks in the shared code, and it will be easier
to make specific changes for openrcs without touching the
soon-to-be-replaced opencvs code.

/* $OpenBSD: xmalloc.c,v 1.1 2006/04/26 02:55:13 joris Exp $ */
/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Versions of malloc and friends that check their results, and never return
 * failure (they call fatal if they encounter an error).
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 */

#include "includes.h"

#include "xmalloc.h"

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

	if (size == 0)
		errx(1, "xmalloc: zero size");
	ptr = malloc(size);
	if (ptr == NULL)
		errx(1,
		    "xmalloc: out of memory (allocating %lu bytes)",
		    (u_long) size);
	return ptr;
}

void *
xcalloc(size_t nmemb, size_t size)
{
	void *ptr;

	if (size == 0 || nmemb == 0)
		errx(1, "xcalloc: zero size");
	if (SIZE_T_MAX / nmemb < size)
		errx(1, "xcalloc: nmemb * size > SIZE_T_MAX");
	ptr = calloc(nmemb, size);
	if (ptr == NULL)
		errx(1, "xcalloc: out of memory (allocating %lu bytes)",
		    (u_long)(size * nmemb));
	return ptr;
}

void *
xrealloc(void *ptr, size_t nmemb, size_t size)
{
	void *new_ptr;
	size_t new_size = nmemb * size;

	if (new_size == 0)
		errx(1, "xrealloc: zero size");
	if (SIZE_T_MAX / nmemb < size)
		errx(1, "xrealloc: nmemb * size > SIZE_T_MAX");
	if (ptr == NULL)
		new_ptr = malloc(new_size);
	else
		new_ptr = realloc(ptr, new_size);
	if (new_ptr == NULL)
		errx(1, "xrealloc: out of memory (new_size %lu bytes)",
		    (u_long) new_size);
	return new_ptr;
}

void
xfree(void *ptr)
{
	if (ptr == NULL)
		errx(1, "xfree: NULL pointer given as argument");
	free(ptr);
}

char *
xstrdup(const char *str)
{
	size_t len;
	char *cp;

	len = strlen(str) + 1;
	cp = xmalloc(len);
	strlcpy(cp, str, len);
	return cp;
}

int
xasprintf(char **ret, const char *fmt, ...)
{
	va_list ap;
	int i;

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

	if (i < 0 || *ret == NULL)
		errx(1, "xasprintf: could not allocate memory");

	return (i);
}