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# -*- shell-script -*-
#
# Copyright (C) 2008 Rocky Bernstein rocky@gnu.org
#
# bashdb 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.
#
# bashdb 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 bashdb; see the file COPYING. If not, write to the Free Software
# Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
_Dbg_help_add trace \
'trace FN -- Wrap FN in set -x .. set -x tracing.'
# Wrap "set -x .. set +x" around a call to function $1.
# Normally we also save and restrore any trap DEBUG functions. However
# If $2 is 0 we will won't.
# The wrapped function becomes the new function and the original
# function is called old_$1.
# $? is 0 if successful.
function _Dbg_do_trace_fn {
typeset -r fn=$1
typeset -ri clear_debug_trap=${2:-1}
if [[ -z $fn ]] ; then
_Dbg_errmsg "trace_fn: missing or invalid function name"
return 2
fi
_Dbg_is_function "$fn" $_Dbg_debug_debugger || {
_Dbg_errmsg "trace_fn: function \"$fn\" is not a function."
return 3
}
cmd=old_$(declare -f -- "$fn") || {
return 4
}
((_Dbg_debug_debugger)) && echo "$cmd"
typeset save_clear_debug_trap_cmd=''
typeset restore_trap_cmd=''
if (( clear_debug_trap )) ; then
save_clear_trap_cmd='local old_handler=$(trap -p DEBUG); trap - DEBUG'
restore_trap_cmd='eval $old_handler'
fi
eval "$cmd" || return 5
cmd="${fn}() {
$save_clear_trap_cmd
typeset -ri old_set_x=is_traced
set -x
old_$fn \"\$@\"
typeset -ri rc=\$?
(( old_set_x == 0 )) && set +x # still messes up of fn did: set -x
$restore_trap_cmd
return \$rc
}
"
((_Dbg_debug_debugger)) && echo "$cmd"
eval "$cmd" || return 6
return 0
}
_Dbg_help_add untrace \
'untrace FN -- Undo trace of FN.'
# Undo wrapping fn
# $? is 0 if successful.
function _Dbg_do_untrace_fn {
typeset -r fn=$1
if [[ -z $fn ]] ; then
_Dbg_errmsg "untrace_fn: missing or invalid function name."
return 2
fi
_Dbg_is_function "$fn" || {
_Dbg_errmsg "untrace_fn: function \"$fn\" is not a function."
return 3
}
_Dbg_is_function "old_$fn" || {
_Dbg_errmsg "untrace_fn: old function old_$fn not seen - nothing done."
return 4
}
cmd=$(declare -f -- "old_$fn") || return 5
cmd=${cmd#old_}
((_Dbg_debug_debugger)) && echo $cmd
eval "$cmd" || return 6
return 0
}
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