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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: def.h,v 1.8 2001/11/20 20:50:00 millert Exp $	*/
/*	$NetBSD: def.h,v 1.9 1996/12/28 07:11:00 tls 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.
 *
 *	@(#)def.h	8.4 (Berkeley) 4/20/95
 *	$OpenBSD: def.h,v 1.8 2001/11/20 20:50:00 millert Exp $
 */

/*
 * Mail -- a mail program
 *
 * Author: Kurt Shoens (UCB) March 25, 1978
 */

#ifndef MAIL_DEF_H
#define MAIL_DEF_H

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>

#include <ctype.h>
#include <err.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "pathnames.h"

#define	APPEND				/* New mail goes to end of mailbox */

#define	ESCAPE		'~'		/* Default escape for sending */
#define	NMLSIZE		1024		/* max names in a message list */
#define	PATHSIZE	MAXPATHLEN	/* Size of pathnames throughout */
#define	HSHSIZE		59		/* Hash size for aliases and vars */
#define	LINESIZE	BUFSIZ		/* max readable line width */
#define	STRINGSIZE	((unsigned) 128)/* Dynamic allocation units */
#define	MAXARGC		1024		/* Maximum list of raw strings */
#define	MAXEXP		25		/* Maximum expansion of aliases */

#define	equal(a, b)	(strcmp(a,b)==0)/* A nice function to string compare */

struct message {
	short	m_flag;			/* flags, see below */
	int	m_offset;		/* offset in block of message */
	int	m_block;		/* block number of this message */
	int	m_size;			/* Bytes in the message */
	int	m_lines;		/* Lines in the message */
};

/*
 * flag bits.
 */

#define	MUSED		(1<<0)		/* entry is used, but this bit isn't */
#define	MDELETED	(1<<1)		/* entry has been deleted */
#define	MSAVED		(1<<2)		/* entry has been saved */
#define	MTOUCH		(1<<3)		/* entry has been noticed */
#define	MPRESERVE	(1<<4)		/* keep entry in sys mailbox */
#define	MMARK		(1<<5)		/* message is marked! */
#define	MODIFY		(1<<6)		/* message has been modified */
#define	MNEW		(1<<7)		/* message has never been seen */
#define	MREAD		(1<<8)		/* message has been read sometime. */
#define	MSTATUS		(1<<9)		/* message status has changed */
#define	MBOX		(1<<10)		/* Send this to mbox, regardless */

/*
 * Given a file address, determine the block number it represents.
 */
#define blockof(off)			((int) ((off) / 4096))
#define offsetof(off)			((int) ((off) % 4096))
#define positionof(block, offset)	((off_t)(block) * 4096 + (offset))

/*
 * Format of the command description table.
 * The actual table is declared and initialized
 * in lex.c
 */
struct cmd {
	char	*c_name;		/* Name of command */
	union {
		int	(*c_func0)();
		int	(*c_func1) __P((void *));
		int	(*c_func2) __P((void *, void *));
	} cfunc;                        /* Implementor of the command */
#define c_func  cfunc.c_func1
#define c_func2 cfunc.c_func2
	short	c_argtype;		/* Type of arglist (see below) */
	short	c_msgflag;		/* Required flags of messages */
	short	c_msgmask;		/* Relevant flags of messages */
};

/* Yechh, can't initialize unions */

#define	c_minargs c_msgflag		/* Minimum argcount for RAWLIST */
#define	c_maxargs c_msgmask		/* Max argcount for RAWLIST */

/*
 * Argument types.
 */

#define	MSGLIST	0x0001		/* Message list type */
#define	STRLIST	0x0002		/* A pure string */
#define	RAWLIST	0x0004		/* Shell string list */
#define	NOLIST	0x0008		/* Just plain 0 */
#define	NDMLIST	0x0010		/* Message list, no defaults */

#define	P	0x0020		/* Autoprint dot after command */
#define	I	0x0040		/* Interactive command bit */
#define	M	0x0080		/* Legal from send mode bit */
#define	W	0x0100		/* Illegal when read only bit */
#define	F	0x0200		/* Is a conditional command */
#define	T	0x0400		/* Is a transparent command */
#define	R	0x0800		/* Cannot be called from collect */

/*
 * Oft-used mask values
 */

#define	MMNORM		(MDELETED|MSAVED)/* Look at both save and delete bits */
#define	MMNDEL		MDELETED	/* Look only at deleted bit */

/*
 * Structure used to return a break down of a head
 * line (hats off to Bill Joy!)
 */

struct headline {
	char	*l_from;	/* The name of the sender */
	char	*l_tty;		/* His tty string (if any) */
	char	*l_date;	/* The entire date string */
};

#define	GTO	1		/* Grab To: line */
#define	GSUBJECT 2		/* Likewise, Subject: line */
#define	GCC	4		/* And the Cc: line */
#define	GBCC	8		/* And also the Bcc: line */
#define	GMASK	(GTO|GSUBJECT|GCC|GBCC)
				/* Mask of places from whence */

#define	GNL	16		/* Print blank line after */
#define	GDEL	32		/* Entity removed from list */
#define	GCOMMA	64		/* detract puts in commas */

/*
 * Structure used to pass about the current
 * state of the user-typed message header.
 */

struct header {
	struct name *h_to;		/* Dynamic "To:" string */
	char *h_subject;		/* Subject string */
	struct name *h_cc;		/* Carbon copies string */
	struct name *h_bcc;		/* Blind carbon copies */
	struct name *h_smopts;		/* Sendmail options */
};

/*
 * Structure of namelist nodes used in processing
 * the recipients of mail and aliases and all that
 * kind of stuff.
 */

struct name {
	struct	name *n_flink;		/* Forward link in list. */
	struct	name *n_blink;		/* Backward list link */
	short	n_type;			/* From which list it came */
	char	*n_name;		/* This fella's name */
};

/*
 * Structure of a variable node.  All variables are
 * kept on a singly-linked list of these, rooted by
 * "variables"
 */

struct var {
	struct	var *v_link;		/* Forward link to next variable */
	char	*v_name;		/* The variable's name */
	char	*v_value;		/* And it's current value */
};

struct group {
	struct	group *ge_link;		/* Next person in this group */
	char	*ge_name;		/* This person's user name */
};

struct grouphead {
	struct	grouphead *g_link;	/* Next grouphead in list */
	char	*g_name;		/* Name of this group */
	struct	group *g_list;		/* Users in group. */
};

#define	NIL	((struct name *) 0)	/* The nil pointer for namelists */
#define	NONE	((struct cmd *) 0)	/* The nil pointer to command tab */
#define	NOVAR	((struct var *) 0)	/* The nil pointer to variables */
#define	NOGRP	((struct grouphead *) 0)/* The nil grouphead pointer */
#define	NOGE	((struct group *) 0)	/* The nil group pointer */

/*
 * Structure of the hash table of ignored header fields
 */
struct ignoretab {
	int i_count;			/* Number of entries */
	struct ignore {
		struct ignore *i_link;	/* Next ignored field in bucket */
		char *i_field;		/* This ignored field */
	} *i_head[HSHSIZE];
};

/*
 * Token values returned by the scanner used for argument lists.
 * Also, sizes of scanner-related things.
 */

#define	TEOL	0			/* End of the command line */
#define	TNUMBER	1			/* A message number */
#define	TDASH	2			/* A simple dash */
#define	TSTRING	3			/* A string (possibly containing -) */
#define	TDOT	4			/* A "." */
#define	TUP	5			/* An "^" */
#define	TDOLLAR	6			/* A "$" */
#define	TSTAR	7			/* A "*" */
#define	TOPEN	8			/* An '(' */
#define	TCLOSE	9			/* A ')' */
#define TPLUS	10			/* A '+' */
#define TERROR	11			/* A lexical error */

#define	REGDEP	2			/* Maximum regret depth. */
#define	STRINGLEN	1024		/* Maximum length of string token */

/*
 * Constants for conditional commands.  These describe whether
 * we should be executing stuff or not.
 */

#define	CANY		0		/* Execute in send or receive mode */
#define	CRCV		1		/* Execute in receive mode only */
#define	CSEND		2		/* Execute in send mode only */

/*
 * Truncate a file to the last character written. This is
 * useful just before closing an old file that was opened
 * for read/write.
 */
#define trunc(stream) {							\
	(void)fflush(stream); 						\
	(void)ftruncate(fileno(stream), (off_t)ftell(stream));		\
}

#endif /* MAIL_DEF_H */