# -*- shell-script -*-
# handle.sh - gdb-like "handle" debugger command
#
#   Copyright (C) 2002-2006, 2008, 2010, 2016 Rocky Bernstein
#   <rocky@gnu.org>
#
#   This program is free software; you can redistribute it and/or
#   modify it under the terms of the GNU General Public License as
#   published by the Free Software Foundation; either version 2, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#   General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; see the file COPYING.  If not, write to
#   the Free Software Foundation, 59 Temple Place, Suite 330, Boston,
#   MA 02111 USA.


# Process debugger "handle" command.

_Dbg_help_add handle \
"**handle** *signal* *action*

Specify how to handle *signal*.

*signal* is a signal name like SIGSEGV, but numeric signals like 11
(which is usually equivalent on \*nix systems) is okay too.

*action* is one of \"stop\", \"nostop\", \"print\", and
\"noprint\". \"Stop\" indicates entering debugger if this signal
happens. \"Print\" indicates printing a message if this signal is
encountered. \"Stack\" is like \"print\" but except the entire call
stack is printed. Prefacing these actions with \"no\" indicates not to
do the indicated action."

proc _Dbg_do_handle {
    typeset sig=$1
    typeset cmd=$2
    typeset -i signum
    if [[ -z $sig ]]  {
	_Dbg_errmsg "Missing signal name or signal number."
    return 1
    }

    if [[ $sig == $int_pat ]] {
	setvar signame = $(_Dbg_signum2name $sig)
	if (( $? != 0 ))  {
	    _Dbg_errmsg "Bad signal number: $sig"
	    return 2
	}
	setvar signum = 'sig'
    } else {
	typeset signum;
	setvar signum = $(_Dbg_name2signum $sig)
	if (( $? != 0 ))  {
	    _Dbg_errmsg "Bad signal name: $sig"
	    return 3
	}
    }

    case (cmd) {
	nop | nopr | nopri | noprin | noprint  {
	    setvar _Dbg_sig_print[signum]='noprint'
	    # noprint implies nostop
	    setvar _Dbg_sig_stop[signum]='stop'
	    }

	nosta | nostac | nostack  {
	    setvar _Dbg_sig_show_stack[signum]='nostack'
	    }

	nosto | nostop   {
	    setvar _Dbg_sig_stop[signum]='nostop'
	    }

	p | pr | pri | prin | print  {
	    setvar _Dbg_sig_print[signum]='print'
	    }

	sta | stac | stack  {
	    setvar _Dbg_sig_show_stack[signum]='showstack'
	    }

	sto | stop  {
	    setvar _Dbg_sig_stop[signum]='stop'
	    # stop keyword implies print
	    setvar _Dbg_sig_print[signum]='print'
	    }
	*  {
	    if (( !cmd ))  {
		_Dbg_errmsg \
		    "Need to give a command: stop, nostop, stack, nostack, print, noprint"
		return 4
	    } else {
		_Dbg_errmsg "Invalid handler command $cmd"
		return 5
	    }
	    }
    }
    return 0
}