#   Copyright (C) 1988, 1990, 1991, 1992 Free Software Foundation, Inc.

# 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 of the License, 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; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

# Please email any bugs, comments, and/or additions to this file to:
# bug-gdb@prep.ai.mit.edu

# This file was written by Rob Savoye. (rob@cygnus.com)

# variables that need to set up
#
if ![info exists prompt] then {
    set prompt "\(gdb\)"
}
# some convenience abbreviations
#
if ![info exists hex] then {
    set hex "0x\[0-9A-Fa-f\]+"
}
if ![info exists decimal] then {
    set decimal "\[0-9\]+"
}

#
# gdb_version -- extract and print the version number of gcc
#
proc gdb_version {} {
    global GDB
    global GDBFLAGS
    if {[which $GDB] != 0} then {
    set tmp [exec echo "q" | $GDB]
	set version "[lindex $tmp [lsearch $tmp "\[0-9\]*"]]"
	set version "[string range $version 0 [expr [string length $version]-2]]"
    clone_output "[which $GDB] version $version $GDBFLAGS\n"
    } else {
	warning "$GDB does not exist"
}
}

#
# gdb_unload -- unload a file if one is loaded
#

proc gdb_unload {} {
    global verbose
    global GDB
    global prompt
    send "file\n"
    expect {
	-re "No exec file now\.\r" { continue -expect }
	-re "No symbol file now\.\r" { continue -expect }
	-re "A program is being debugged already..*Kill it\? \(y or n\) $"\
	    { send "y\n"
		if $verbose>1 then {
		    send_user "\t\tKilling previous program being debugged\n"
		}
	    continue -expect
	}
	-re "Discard symbol table from .*\? \(y or n\) $" {
	    send "y\n"
	    continue -expect
	}
	-re "$prompt $" {}
	timeout {
	    error "Couldn't unload file in $GDB (timed out)."
	    return -1
	}
    }
}

#
# gdb_load -- load a file into the debugger.
#             return a -1 if anything goes wrong.
#
proc gdb_load { arg } {
    global verbose
    global loadpath
    global loadfile
    global GDB
    global prompt

    set loadfile [file tail $arg]
    set loadpath [file dirname $arg]
    send "file $arg\n"
    expect {
	-re "Reading symbols from.*done.*$prompt $" {
	    if $verbose>1 then {
		send_user "\t\tLoaded $arg into the $GDB\n"
	    }
	    return 0
	}
	-re "has no symbol-table.*$prompt $" {
	    error "$arg wasn't compiled with \"-g\""
	    return -1
	}
	-re "A program is being debugged already..*Kill it\? \(y or n\) $" {
	    send "y\n"
		if $verbose>1 then {
		    send_user "\t\tKilling previous program being debugged\n"
		}
	    continue -expect
	}
	-re "Load new symbol table from.*\? \(y or n\) $" {
	    send "y\n"
	    expect {
		-re "Reading symbols from.*done.*$prompt $" {
		    if $verbose>1 then {
		    send_user "\t\tLoaded $arg with new symbol table into $GDB\n"
		}
		    return 0
		}
		timeout	{
		    error "(timeout) Couldn't load $arg, other program already loaded."
		    return -1
		}
	    }
		}
	-re ".*No such file or directory.*$prompt $" {
	    error "($arg) No such file or directory\n"
	    return -1
	}
	-re "$prompt $" {
	    error "couldn't load $arg into $GDB."
	    return -1
	    }
	timeout	{
	    error "couldn't load $arg into $GDB (timed out)."
	    return -1
	}
    }
}

#
# gdb_exit -- kills the gdb process currently running
#
proc gdb_exit {} {
    global verbose
    global GDB
    global GDBFLAGS
    set timeout 1

    if $verbose>1 then {
	send_user "Quitting $GDB $GDBFLAGS\n"
    }    
    catch "send \"quit\n\"" result
    if [string match "write\(spawn_id=\[0-9\]+\):" $result] then {
	catch "close"
	return -1
    }
    catch {
    expect {
	eof                 { 
	    if $verbose>1 then {
		send_user "Got EOF from $GDB\n"
	    }
	}
	timeout             { 
	    if $verbose>1 then {
		send_user "Got TIMEOUT from $GDB\n"
	    }
	    close
	}
	    -re "The program is running.  Quit anyway.*? (y or n) $" {
		send "y\n"
		if $verbose>1 then {
		    send_user "\t\tKilling program being debugged\n"
		}
	        close
	    }
    }
    }
    catch "close"

    if $verbose>1 then {
	send_user "Quitting $GDB $GDBFLAGS\n"
    }    
}

#
# start gdb -- start gdb running
#

proc gdb_start {} {
    global verbose
    global GDB
    global GDBFLAGS
    global prompt
    global spawn_id
    global timeout
    if $verbose>1 then {
	send_user "Spawning $GDB $GDBFLAGS\n"
    }

    set oldtimeout $timeout
    set timeout [expr "$timeout + 60"]
    if [ llength $GDBFLAGS ] then {
	if {[which $GDB] != 0} then {
	spawn $GDB $GDBFLAGS
    } else {
	    error "$GDB does not exist."
	    exit 1
	}
    } else {
	IF {[WHICH $GDB] != 0} then {
	spawn $GDB
	} else {
	    error "$GDB does not exist."
	    exit 1
	}
    }
    expect {
	-re ".*$prompt $"	{
	    if $verbose>1 then {
		send_user "GDB initialized for native mode\n"
	}
    }
	-re "$prompt $"	{
	    error "GDB never initialized."
	    return -1
	}
	timeout		{
	    error "(timeout) GDB never initialized."
	    return -1
	}
    }
    set timeout $oldtimeout
    # force the height to "unlimited", so no pagers get used
    send "set height 0\n"
    expect {
	-re ".*$prompt $" { 
	    if $verbose>2 then {
		send_user "Seting height to 0.\n"
	    }
	}
	timeout {
	    warning "Couldn't set the height to 0."
	}
    }
    # force the width to "unlimited", so no wraparound occurs
    send "set width 0\n"
    expect {
	-re ".*$prompt $" {
	    if $verbose>2 then {
		send_user "Seting width to 0.\n"
}
	}
	timeout {
	    warning "Couldn't set the width to 0."
}
    }
}

# These only need to be uncommented for debugging test cases. They exist
# mainly to catch programming errors
#expect_after {
#    "<return>"		   { send "\n"; error "Window too small." }
#    -re "\(y or n\) " 	   { send "n\n"; error "Got interactive prompt." }
#    buffer_full		   { error "internal buffer is full." }
#    eof			   { error "eof -- there is no child process" ; alldone}
#    timeout			   { error "timeout." }
#    "virtual memory exhausted" { error "virtual memory exhausted." }
#    "Undefined command"	   { error "send string probably wrong." }
#}

load_lib gdb.exp

set binpath /s1/users/rob/vxworks/bin/somewhere-bogus-that-needs-configuring
set bin $GDB

gdb_start