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Major signal overhaul.  We no longer longjmp all over the place.
Instead, routines responsible to gathering user input (or in some
cases outputting data) catch the signals and set flags as needed.
Because of this some handlers are install without the SA_RESTART
flag so syscalls are not restarted and we can check the flag.  All
signal handlers are now safe.

This should make the flow of control a bit more grokable but the
code is still ugly.

/*	$OpenBSD: glob.h,v 1.5 2001/11/20 20:50:00 millert Exp $	*/
/*	$NetBSD: glob.h,v 1.4 1996/06/08 19:48:25 christos Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	from: @(#)glob.h	8.1 (Berkeley) 6/6/93
 *	$NetBSD: glob.h,v 1.4 1996/06/08 19:48:25 christos Exp $
 */

/*
 * A bunch of global variable declarations lie herein.
 * def.h must be included first.
 */

int	msgCount;			/* Count of messages read in */
int	rcvmode;			/* True if receiving mail */
int	sawcom;				/* Set after first command */
char	*Tflag;				/* -T temp file for netnews */
int	senderr;			/* An error while checking */
int	edit;				/* Indicates editing a file */
int	readonly;			/* Will be unable to rewrite file */
int	noreset;			/* String resets suspended */
int	sourcing;			/* Currently reading variant file */
int	loading;			/* Loading user definitions */
int	cond;				/* Current state of conditional exc. */
FILE	*itf;				/* Input temp file buffer */
FILE	*otf;				/* Output temp file buffer */
int	image;				/* File descriptor for image of msg */
FILE	*input;				/* Current command input file */
char	mailname[PATHSIZE];		/* Name of current file */
char	prevfile[PATHSIZE];		/* Name of previous file */
char	*homedir;			/* Path name of home directory */
char	*myname;			/* My login name */
off_t	mailsize;			/* Size of system mailbox */
int	lexnumber;			/* Number of TNUMBER from scan() */
char	lexstring[STRINGLEN];		/* String from TSTRING, scan() */
int	regretp;			/* Pointer to TOS of regret tokens */
int	regretstack[REGDEP];		/* Stack of regretted tokens */
char	*string_stack[REGDEP];		/* Stack of regretted strings */
int	numberstack[REGDEP];		/* Stack of regretted numbers */
struct	message	*dot;			/* Pointer to current message */
struct	message	*message;		/* The actual message structure */
struct	var	*variables[HSHSIZE];	/* Pointer to active var list */
struct	grouphead	*groups[HSHSIZE];/* Pointer to active groups */
struct	ignoretab	ignore[2];	/* ignored and retained fields
					   0 is ignore, 1 is retain */
struct	ignoretab	saveignore[2];	/* ignored and retained fields
					   on save to folder */
struct	ignoretab	ignoreall[2];	/* special, ignore all headers */
char	**altnames;			/* List of alternate names for user */
int	debug;				/* Debug flag set */
int	screenwidth;			/* Screen width, or best guess */
int	screenheight;			/* Screen height, or best guess,
					   for "header" command */
int	realscreenheight;		/* the real screen height */
int	uflag;				/* Are we in -u mode? */
sigset_t intset;			/* Signal set that is just SIGINT */


/*
 * The pointers for the string allocation routines,
 * there are NSPACE independent areas.
 * The first holds STRINGSIZE bytes, the next
 * twice as much, and so on.
 */

#define	NSPACE	25			/* Total number of string spaces */
struct strings {
	char	*s_topFree;		/* Beginning of this area */
	char	*s_nextFree;		/* Next alloctable place here */
	unsigned s_nleft;		/* Number of bytes left here */
} stringdope[NSPACE];