genStubs.tcl
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- # genStubs.tcl --
- #
- # This script generates a set of stub files for a given
- # interface.
- #
- #
- # Copyright (c) 1998-1999 by Scriptics Corporation.
- # See the file "license.terms" for information on usage and redistribution
- # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- #
- # RCS: @(#) $Id: genStubs.tcl,v 1.13 2002/10/04 08:25:14 dkf Exp $
- package require Tcl 8
- namespace eval genStubs {
- # libraryName --
- #
- # The name of the entire library. This value is used to compute
- # the USE_*_STUB_PROCS macro and the name of the init file.
- variable libraryName "UNKNOWN"
- # interfaces --
- #
- # An array indexed by interface name that is used to maintain
- # the set of valid interfaces. The value is empty.
- array set interfaces {}
- # curName --
- #
- # The name of the interface currently being defined.
- variable curName "UNKNOWN"
- # hooks --
- #
- # An array indexed by interface name that contains the set of
- # subinterfaces that should be defined for a given interface.
- array set hooks {}
- # stubs --
- #
- # This three dimensional array is indexed first by interface name,
- # second by platform name, and third by a numeric offset or the
- # constant "lastNum". The lastNum entry contains the largest
- # numeric offset used for a given interface/platform combo. Each
- # numeric offset contains the C function specification that
- # should be used for the given entry in the stub table. The spec
- # consists of a list in the form returned by parseDecl.
- array set stubs {}
- # outDir --
- #
- # The directory where the generated files should be placed.
- variable outDir .
- }
- # genStubs::library --
- #
- # This function is used in the declarations file to set the name
- # of the library that the interfaces are associated with (e.g. "tcl").
- # This value will be used to define the inline conditional macro.
- #
- # Arguments:
- # name The library name.
- #
- # Results:
- # None.
- proc genStubs::library {name} {
- variable libraryName $name
- }
- # genStubs::interface --
- #
- # This function is used in the declarations file to set the name
- # of the interface currently being defined.
- #
- # Arguments:
- # name The name of the interface.
- #
- # Results:
- # None.
- proc genStubs::interface {name} {
- variable curName $name
- variable interfaces
- set interfaces($name) {}
- return
- }
- # genStubs::hooks --
- #
- # This function defines the subinterface hooks for the current
- # interface.
- #
- # Arguments:
- # names The ordered list of interfaces that are reachable through the
- # hook vector.
- #
- # Results:
- # None.
- proc genStubs::hooks {names} {
- variable curName
- variable hooks
- set hooks($curName) $names
- return
- }
- # genStubs::declare --
- #
- # This function is used in the declarations file to declare a new
- # interface entry.
- #
- # Arguments:
- # index The index number of the interface.
- # platform The platform the interface belongs to. Should be one
- # of generic, win, unix, or mac, or macosx or aqua or x11.
- # decl The C function declaration, or {} for an undefined
- # entry.
- #
- # Results:
- # None.
- proc genStubs::declare {args} {
- variable stubs
- variable curName
- if {[llength $args] != 3} {
- puts stderr "wrong # args: declare $args"
- }
- lassign $args index platformList decl
- # Check for duplicate declarations, then add the declaration and
- # bump the lastNum counter if necessary.
- foreach platform $platformList {
- if {[info exists stubs($curName,$platform,$index)]} {
- puts stderr "Duplicate entry: declare $args"
- }
- }
- regsub -all "[ tn]+" [string trim $decl] " " decl
- set decl [parseDecl $decl]
- foreach platform $platformList {
- if {$decl != ""} {
- set stubs($curName,$platform,$index) $decl
- if {![info exists stubs($curName,$platform,lastNum)]
- || ($index > $stubs($curName,$platform,lastNum))} {
- set stubs($curName,$platform,lastNum) $index
- }
- }
- }
- return
- }
- # genStubs::rewriteFile --
- #
- # This function replaces the machine generated portion of the
- # specified file with new contents. It looks for the !BEGIN! and
- # !END! comments to determine where to place the new text.
- #
- # Arguments:
- # file The name of the file to modify.
- # text The new text to place in the file.
- #
- # Results:
- # None.
- proc genStubs::rewriteFile {file text} {
- if {![file exists $file]} {
- puts stderr "Cannot find file: $file"
- return
- }
- set in [open ${file} r]
- set out [open ${file}.new w]
- while {![eof $in]} {
- set line [gets $in]
- if {[regexp {!BEGIN!} $line]} {
- break
- }
- puts $out $line
- }
- puts $out "/* !BEGIN!: Do not edit below this line. */"
- puts $out $text
- while {![eof $in]} {
- set line [gets $in]
- if {[regexp {!END!} $line]} {
- break
- }
- }
- puts $out "/* !END!: Do not edit above this line. */"
- puts -nonewline $out [read $in]
- close $in
- close $out
- file rename -force ${file}.new ${file}
- return
- }
- # genStubs::addPlatformGuard --
- #
- # Wrap a string inside a platform #ifdef.
- #
- # Arguments:
- # plat Platform to test.
- #
- # Results:
- # Returns the original text inside an appropriate #ifdef.
- proc genStubs::addPlatformGuard {plat text} {
- switch $plat {
- win {
- return "#ifdef __WIN32__n${text}#endif /* __WIN32__ */n"
- }
- unix {
- return "#if !defined(__WIN32__) && !defined(MAC_TCL) /* UNIX */n${text}#endif /* UNIX */n"
- }
- mac {
- return "#ifdef MAC_TCLn${text}#endif /* MAC_TCL */n"
- }
- macosx {
- return "#ifdef MAC_OSX_TCLn${text}#endif /* MAC_OSX_TCL */n"
- }
- aqua {
- return "#ifdef MAC_OSX_TKn${text}#endif /* MAC_OSX_TK */n"
- }
- x11 {
- return "#if !(defined(__WIN32__) || defined(MAC_TCL) || defined(MAC_OSX_TK)) /* X11 */n${text}#endif /* X11 */n"
- }
- }
- return "$text"
- }
- # genStubs::emitSlots --
- #
- # Generate the stub table slots for the given interface. If there
- # are no generic slots, then one table is generated for each
- # platform, otherwise one table is generated for all platforms.
- #
- # Arguments:
- # name The name of the interface being emitted.
- # textVar The variable to use for output.
- #
- # Results:
- # None.
- proc genStubs::emitSlots {name textVar} {
- variable stubs
- upvar $textVar text
- forAllStubs $name makeSlot 1 text {" void *reserved$i;n"}
- return
- }
- # genStubs::parseDecl --
- #
- # Parse a C function declaration into its component parts.
- #
- # Arguments:
- # decl The function declaration.
- #
- # Results:
- # Returns a list of the form {returnType name args}. The args
- # element consists of a list of type/name pairs, or a single
- # element "void". If the function declaration is malformed
- # then an error is displayed and the return value is {}.
- proc genStubs::parseDecl {decl} {
- if {![regexp {^(.*)((.*))$} $decl all prefix args]} {
- puts stderr "Malformed declaration: $decl"
- return
- }
- set prefix [string trim $prefix]
- if {![regexp {^(.+[ ][*]*)([^ *]+)$} $prefix all rtype fname]} {
- puts stderr "Bad return type: $decl"
- return
- }
- set rtype [string trim $rtype]
- foreach arg [split $args ,] {
- lappend argList [string trim $arg]
- }
- if {![string compare [lindex $argList end] "..."]} {
- if {[llength $argList] != 2} {
- puts stderr "Only one argument is allowed in varargs form: $decl"
- }
- set arg [parseArg [lindex $argList 0]]
- if {$arg == "" || ([llength $arg] != 2)} {
- puts stderr "Bad argument: '[lindex $argList 0]' in '$decl'"
- return
- }
- set args [list TCL_VARARGS $arg]
- } else {
- set args {}
- foreach arg $argList {
- set argInfo [parseArg $arg]
- if {![string compare $argInfo "void"]} {
- lappend args "void"
- break
- } elseif {[llength $argInfo] == 2 || [llength $argInfo] == 3} {
- lappend args $argInfo
- } else {
- puts stderr "Bad argument: '$arg' in '$decl'"
- return
- }
- }
- }
- return [list $rtype $fname $args]
- }
- # genStubs::parseArg --
- #
- # This function parses a function argument into a type and name.
- #
- # Arguments:
- # arg The argument to parse.
- #
- # Results:
- # Returns a list of type and name with an optional third array
- # indicator. If the argument is malformed, returns "".
- proc genStubs::parseArg {arg} {
- if {![regexp {^(.+[ ][*]*)([^][ *]+)([])?$} $arg all type name array]} {
- if {$arg == "void"} {
- return $arg
- } else {
- return
- }
- }
- set result [list [string trim $type] $name]
- if {$array != ""} {
- lappend result $array
- }
- return $result
- }
- # genStubs::makeDecl --
- #
- # Generate the prototype for a function.
- #
- # Arguments:
- # name The interface name.
- # decl The function declaration.
- # index The slot index for this function.
- #
- # Results:
- # Returns the formatted declaration string.
- proc genStubs::makeDecl {name decl index} {
- lassign $decl rtype fname args
- append text "/* $index */n"
- set line "EXTERN $rtype"
- set count [expr {2 - ([string length $line] / 8)}]
- append line [string range "ttt" 0 $count]
- set pad [expr {24 - [string length $line]}]
- if {$pad <= 0} {
- append line " "
- set pad 0
- }
- append line "$fname _ANSI_ARGS_("
- set arg1 [lindex $args 0]
- switch -exact $arg1 {
- void {
- append line "(void)"
- }
- TCL_VARARGS {
- set arg [lindex $args 1]
- append line "TCL_VARARGS([lindex $arg 0],[lindex $arg 1])"
- }
- default {
- set sep "("
- foreach arg $args {
- append line $sep
- set next {}
- append next [lindex $arg 0] " " [lindex $arg 1]
- [lindex $arg 2]
- if {[string length $line] + [string length $next]
- + $pad > 76} {
- append text $line n
- set line "tttt"
- set pad 28
- }
- append line $next
- set sep ", "
- }
- append line ")"
- }
- }
- append text $line
-
- append text ");n"
- return $text
- }
- # genStubs::makeMacro --
- #
- # Generate the inline macro for a function.
- #
- # Arguments:
- # name The interface name.
- # decl The function declaration.
- # index The slot index for this function.
- #
- # Results:
- # Returns the formatted macro definition.
- proc genStubs::makeMacro {name decl index} {
- lassign $decl rtype fname args
- set lfname [string tolower [string index $fname 0]]
- append lfname [string range $fname 1 end]
- set text "#ifndef $fnamen#define $fname"
- set arg1 [lindex $args 0]
- set argList ""
- switch -exact $arg1 {
- void {
- set argList "()"
- }
- TCL_VARARGS {
- }
- default {
- set sep "("
- foreach arg $args {
- append argList $sep [lindex $arg 1]
- set sep ", "
- }
- append argList ")"
- }
- }
- append text " \nt(${name}StubsPtr->$lfname)"
- append text " /* $index */n#endifn"
- return $text
- }
- # genStubs::makeStub --
- #
- # Emits a stub function definition.
- #
- # Arguments:
- # name The interface name.
- # decl The function declaration.
- # index The slot index for this function.
- #
- # Results:
- # Returns the formatted stub function definition.
- proc genStubs::makeStub {name decl index} {
- lassign $decl rtype fname args
- set lfname [string tolower [string index $fname 0]]
- append lfname [string range $fname 1 end]
- append text "/* Slot $index */n" $rtype "n" $fname
- set arg1 [lindex $args 0]
- if {![string compare $arg1 "TCL_VARARGS"]} {
- lassign [lindex $args 1] type argName
- append text " TCL_VARARGS_DEF($type,$argName)n{n"
- append text " " $type " var;n va_list argList;n"
- if {[string compare $rtype "void"]} {
- append text " " $rtype " resultValue;n"
- }
- append text "n var = (" $type ") TCL_VARARGS_START("
- $type "," $argName ",argList);nn "
- if {[string compare $rtype "void"]} {
- append text "resultValue = "
- }
- append text "(" $name "StubsPtr->" $lfname "VA)(var, argList);n"
- append text " va_end(argList);n"
- if {[string compare $rtype "void"]} {
- append text "return resultValue;n"
- }
- append text "}nn"
- return $text
- }
- if {![string compare $arg1 "void"]} {
- set argList "()"
- set argDecls ""
- } else {
- set argList ""
- set sep "("
- foreach arg $args {
- append argList $sep [lindex $arg 1]
- append argDecls " " [lindex $arg 0] " "
- [lindex $arg 1] [lindex $arg 2] ";n"
- set sep ", "
- }
- append argList ")"
- }
- append text $argList "n" $argDecls "{n "
- if {[string compare $rtype "void"]} {
- append text "return "
- }
- append text "(" $name "StubsPtr->" $lfname ")" $argList ";n}nn"
- return $text
- }
- # genStubs::makeSlot --
- #
- # Generate the stub table entry for a function.
- #
- # Arguments:
- # name The interface name.
- # decl The function declaration.
- # index The slot index for this function.
- #
- # Results:
- # Returns the formatted table entry.
- proc genStubs::makeSlot {name decl index} {
- lassign $decl rtype fname args
- set lfname [string tolower [string index $fname 0]]
- append lfname [string range $fname 1 end]
- set text " "
- append text $rtype " (*" $lfname ") _ANSI_ARGS_("
- set arg1 [lindex $args 0]
- switch -exact $arg1 {
- void {
- append text "(void)"
- }
- TCL_VARARGS {
- set arg [lindex $args 1]
- append text "TCL_VARARGS([lindex $arg 0],[lindex $arg 1])"
- }
- default {
- set sep "("
- foreach arg $args {
- append text $sep [lindex $arg 0] " " [lindex $arg 1]
- [lindex $arg 2]
- set sep ", "
- }
- append text ")"
- }
- }
-
- append text "); /* $index */n"
- return $text
- }
- # genStubs::makeInit --
- #
- # Generate the prototype for a function.
- #
- # Arguments:
- # name The interface name.
- # decl The function declaration.
- # index The slot index for this function.
- #
- # Results:
- # Returns the formatted declaration string.
- proc genStubs::makeInit {name decl index} {
- append text " " [lindex $decl 1] ", /* " $index " */n"
- return $text
- }
- # genStubs::forAllStubs --
- #
- # This function iterates over all of the platforms and invokes
- # a callback for each slot. The result of the callback is then
- # placed inside appropriate platform guards.
- #
- # Arguments:
- # name The interface name.
- # slotProc The proc to invoke to handle the slot. It will
- # have the interface name, the declaration, and
- # the index appended.
- # onAll If 1, emit the skip string even if there are
- # definitions for one or more platforms.
- # textVar The variable to use for output.
- # skipString The string to emit if a slot is skipped. This
- # string will be subst'ed in the loop so "$i" can
- # be used to substitute the index value.
- #
- # Results:
- # None.
- proc genStubs::forAllStubs {name slotProc onAll textVar
- {skipString {"/* Slot $i is reserved */n"}}} {
- variable stubs
- upvar $textVar text
- set plats [array names stubs $name,*,lastNum]
- if {[info exists stubs($name,generic,lastNum)]} {
- # Emit integrated stubs block
- set lastNum -1
- foreach plat [array names stubs $name,*,lastNum] {
- if {$stubs($plat) > $lastNum} {
- set lastNum $stubs($plat)
- }
- }
- for {set i 0} {$i <= $lastNum} {incr i} {
- set slots [array names stubs $name,*,$i]
- set emit 0
- if {[info exists stubs($name,generic,$i)]} {
- if {[llength $slots] > 1} {
- puts stderr "platform entry duplicates generic entry: $i"
- }
- append text [$slotProc $name $stubs($name,generic,$i) $i]
- set emit 1
- } elseif {[llength $slots] > 0} {
- foreach plat {unix win mac} {
- if {[info exists stubs($name,$plat,$i)]} {
- append text [addPlatformGuard $plat
- [$slotProc $name $stubs($name,$plat,$i) $i]]
- set emit 1
- } elseif {$onAll} {
- append text [eval {addPlatformGuard $plat} $skipString]
- set emit 1
- }
- }
- #
- # "aqua" and "macosx" and "x11" are special cases,
- # since "macosx" always implies "unix" and "aqua",
- # "macosx", so we need to be careful not to
- # emit duplicate stubs entries for the two.
- #
- if {[info exists stubs($name,aqua,$i)]
- && ![info exists stubs($name,macosx,$i)]} {
- append text [addPlatformGuard aqua
- [$slotProc $name $stubs($name,aqua,$i) $i]]
- set emit 1
- }
- if {[info exists stubs($name,macosx,$i)]
- && ![info exists stubs($name,unix,$i)]} {
- append text [addPlatformGuard macosx
- [$slotProc $name $stubs($name,macosx,$i) $i]]
- set emit 1
- }
- if {[info exists stubs($name,x11,$i)]
- && ![info exists stubs($name,unix,$i)]} {
- append text [addPlatformGuard x11
- [$slotProc $name $stubs($name,x11,$i) $i]]
- set emit 1
- }
- }
- if {$emit == 0} {
- eval {append text} $skipString
- }
- }
-
- } else {
- # Emit separate stubs blocks per platform
- foreach plat {unix win mac} {
- if {[info exists stubs($name,$plat,lastNum)]} {
- set lastNum $stubs($name,$plat,lastNum)
- set temp {}
- for {set i 0} {$i <= $lastNum} {incr i} {
- if {![info exists stubs($name,$plat,$i)]} {
- eval {append temp} $skipString
- } else {
- append temp [$slotProc $name $stubs($name,$plat,$i) $i]
- }
- }
- append text [addPlatformGuard $plat $temp]
- }
- }
- # Again, make sure you don't duplicate entries for macosx & aqua.
- if {[info exists stubs($name,aqua,lastNum)]
- && ![info exists stubs($name,macosx,lastNum)]} {
- set lastNum $stubs($name,aqua,lastNum)
- set temp {}
- for {set i 0} {$i <= $lastNum} {incr i} {
- if {![info exists stubs($name,aqua,$i)]} {
- eval {append temp} $skipString
- } else {
- append temp [$slotProc $name $stubs($name,aqua,$i) $i]
- }
- }
- append text [addPlatformGuard aqua $temp]
- }
- # Again, make sure you don't duplicate entries for macosx & unix.
- if {[info exists stubs($name,macosx,lastNum)]
- && ![info exists stubs($name,unix,lastNum)]} {
- set lastNum $stubs($name,macosx,lastNum)
- set temp {}
- for {set i 0} {$i <= $lastNum} {incr i} {
- if {![info exists stubs($name,macosx,$i)]} {
- eval {append temp} $skipString
- } else {
- append temp [$slotProc $name $stubs($name,macosx,$i) $i]
- }
- }
- append text [addPlatformGuard macosx $temp]
- }
- # Again, make sure you don't duplicate entries for x11 & unix.
- if {[info exists stubs($name,x11,lastNum)]
- && ![info exists stubs($name,unix,lastNum)]} {
- set lastNum $stubs($name,x11,lastNum)
- set temp {}
- for {set i 0} {$i <= $lastNum} {incr i} {
- if {![info exists stubs($name,x11,$i)]} {
- eval {append temp} $skipString
- } else {
- append temp [$slotProc $name $stubs($name,x11,$i) $i]
- }
- }
- append text [addPlatformGuard x11 $temp]
- }
- }
- }
- # genStubs::emitDeclarations --
- #
- # This function emits the function declarations for this interface.
- #
- # Arguments:
- # name The interface name.
- # textVar The variable to use for output.
- #
- # Results:
- # None.
- proc genStubs::emitDeclarations {name textVar} {
- variable stubs
- upvar $textVar text
- append text "n/*n * Exported function declarations:n */nn"
- forAllStubs $name makeDecl 0 text
- return
- }
- # genStubs::emitMacros --
- #
- # This function emits the inline macros for an interface.
- #
- # Arguments:
- # name The name of the interface being emitted.
- # textVar The variable to use for output.
- #
- # Results:
- # None.
- proc genStubs::emitMacros {name textVar} {
- variable stubs
- variable libraryName
- upvar $textVar text
- set upName [string toupper $libraryName]
- append text "n#if defined(USE_${upName}_STUBS) && !defined(USE_${upName}_STUB_PROCS)n"
- append text "n/*n * Inline function declarations:n */nn"
-
- forAllStubs $name makeMacro 0 text
- append text "n#endif /* defined(USE_${upName}_STUBS) && !defined(USE_${upName}_STUB_PROCS) */n"
- return
- }
- # genStubs::emitHeader --
- #
- # This function emits the body of the <name>Decls.h file for
- # the specified interface.
- #
- # Arguments:
- # name The name of the interface being emitted.
- #
- # Results:
- # None.
- proc genStubs::emitHeader {name} {
- variable outDir
- variable hooks
- set capName [string toupper [string index $name 0]]
- append capName [string range $name 1 end]
- emitDeclarations $name text
- if {[info exists hooks($name)]} {
- append text "ntypedef struct ${capName}StubHooks {n"
- foreach hook $hooks($name) {
- set capHook [string toupper [string index $hook 0]]
- append capHook [string range $hook 1 end]
- append text " struct ${capHook}Stubs *${hook}Stubs;n"
- }
- append text "} ${capName}StubHooks;n"
- }
- append text "ntypedef struct ${capName}Stubs {n"
- append text " int magic;n"
- append text " struct ${capName}StubHooks *hooks;nn"
- emitSlots $name text
- append text "} ${capName}Stubs;n"
- append text "n#ifdef __cplusplusnextern "C" {n#endifn"
- append text "extern ${capName}Stubs *${name}StubsPtr;n"
- append text "#ifdef __cplusplusn}n#endifn"
- emitMacros $name text
- rewriteFile [file join $outDir ${name}Decls.h] $text
- return
- }
- # genStubs::emitStubs --
- #
- # This function emits the body of the <name>Stubs.c file for
- # the specified interface.
- #
- # Arguments:
- # name The name of the interface being emitted.
- #
- # Results:
- # None.
- proc genStubs::emitStubs {name} {
- variable outDir
- append text "n/*n * Exported stub functions:n */nn"
- forAllStubs $name makeStub 0 text
- rewriteFile [file join $outDir ${name}Stubs.c] $text
- return
- }
- # genStubs::emitInit --
- #
- # Generate the table initializers for an interface.
- #
- # Arguments:
- # name The name of the interface to initialize.
- # textVar The variable to use for output.
- #
- # Results:
- # Returns the formatted output.
- proc genStubs::emitInit {name textVar} {
- variable stubs
- variable hooks
- upvar $textVar text
- set capName [string toupper [string index $name 0]]
- append capName [string range $name 1 end]
- if {[info exists hooks($name)]} {
- append text "nstatic ${capName}StubHooks ${name}StubHooks = {n"
- set sep " "
- foreach sub $hooks($name) {
- append text $sep "&${sub}Stubs"
- set sep ",n "
- }
- append text "n};n"
- }
- append text "n${capName}Stubs ${name}Stubs = {n"
- append text " TCL_STUB_MAGIC,n"
- if {[info exists hooks($name)]} {
- append text " &${name}StubHooks,n"
- } else {
- append text " NULL,n"
- }
-
- forAllStubs $name makeInit 1 text {" NULL, /* $i */n"}
- append text "};n"
- return
- }
- # genStubs::emitInits --
- #
- # This function emits the body of the <name>StubInit.c file for
- # the specified interface.
- #
- # Arguments:
- # name The name of the interface being emitted.
- #
- # Results:
- # None.
- proc genStubs::emitInits {} {
- variable hooks
- variable outDir
- variable libraryName
- variable interfaces
- # Assuming that dependencies only go one level deep, we need to emit
- # all of the leaves first to avoid needing forward declarations.
- set leaves {}
- set roots {}
- foreach name [lsort [array names interfaces]] {
- if {[info exists hooks($name)]} {
- lappend roots $name
- } else {
- lappend leaves $name
- }
- }
- foreach name $leaves {
- emitInit $name text
- }
- foreach name $roots {
- emitInit $name text
- }
- rewriteFile [file join $outDir ${libraryName}StubInit.c] $text
- }
- # genStubs::init --
- #
- # This is the main entry point.
- #
- # Arguments:
- # None.
- #
- # Results:
- # None.
- proc genStubs::init {} {
- global argv argv0
- variable outDir
- variable interfaces
- if {[llength $argv] < 2} {
- puts stderr "usage: $argv0 outDir declFile ?declFile...?"
- exit 1
- }
- set outDir [lindex $argv 0]
- foreach file [lrange $argv 1 end] {
- source $file
- }
- foreach name [lsort [array names interfaces]] {
- puts "Emitting $name"
- emitHeader $name
- }
- emitInits
- }
- # lassign --
- #
- # This function emulates the TclX lassign command.
- #
- # Arguments:
- # valueList A list containing the values to be assigned.
- # args The list of variables to be assigned.
- #
- # Results:
- # Returns any values that were not assigned to variables.
- proc lassign {valueList args} {
- if {[llength $args] == 0} {
- error "wrong # args: lassign list varname ?varname..?"
- }
- uplevel [list foreach $args $valueList {break}]
- return [lrange $valueList [llength $args] end]
- }
- genStubs::init