#
# default_ld_version 
#	extract and print the version number of ld
#
proc default_ld_version { ld } {
    if { [file exists $ld] == 0 } then {
	perror "$ld does not exist"
	exit 1
    }
    
    set tmp [exec $ld --version]
    regexp "version.*$" $tmp version
    
    if [info exists version] then {
	clone_output "$ld $version\n"
    }
}

#
# default_ld_relocate 
#	link an object using relocation
#
proc default_ld_relocate { ld target objects } {
    
    global HOSTING_EMU
    
    if { [file exists $ld] == 0 } then {
	perror "$ld does not exist"
	return 0
    }
    
    send_log "$ld $HOSTING_EMU -o $target -r $objects\n"
    verbose "$ld $HOSTING_EMU -o $target -r $objects"
    
    catch "exec $ld $HOSTING_EMU -o $target -r $objects" exec_output
    if [string match "" $exec_output] then {
	return 1
    } else {
	send_log "$exec_output\n"
	verbose "$exec_output"
	return 0
    }
}


#
# default_ld_link 
#	link a program using ld
#
proc default_ld_link { ld target objects } {
    
    global HOSTING_EMU
    global HOSTING_CRT0
    global HOSTING_LIBS
    
    set objs "$HOSTING_CRT0 $objects"
    set libs "$HOSTING_LIBS"
    
    if { [file exists $ld] == 0 } then {
	perror "$ld does not exist"
	return 0
    }
    
    send_log "$ld $HOSTING_EMU -o $target $objs $libs\n"
    verbose "$ld $HOSTING_EMU -o $target $objs $libs"
    
    catch "exec $ld $HOSTING_EMU -o $target $objs $libs" exec_output
    if [string match "" $exec_output] then {
	return 1
    } else {
	send_log "$exec_output\n"
	verbose "$exec_output"
	return 0
    }
}

#
# default_ld_simple_link 
#	link a program using ld, without including any libraries
#
proc default_ld_simple_link { ld target objects } {
    
    if { [file exists $ld] == 0 } then {
	perror "$ld does not exist"
	return 0
    }
    
    send_log "$ld -o $target $objects\n"
    verbose "$ld -o $target $objects"
    
    catch "exec $ld -o $target $objects" exec_output
    if [string match "" $exec_output] then {
	return 1
    } else {
	send_log "$exec_output\n"
	verbose "$exec_output"
	return 0
    }
}

#
# default_ld_compile 
#	compile an object using cc
#
proc default_ld_compile { cc source object } {
    global CFLAGS
    global srcdir
    global subdir
    
    if {[which $cc] == 0} then {
	perror "$cc does not exist"
	return 0
    }

    send_log "$cc -I$srcdir$subdir -c $CFLAGS $source -o $object\n"
    verbose "$cc -I$srcdir$subdir -c $CFLAGS $source -o $object"

    catch "exec $cc -I$srcdir$subdir -c $CFLAGS $source -o $object" exec_output
    if [string match "" $exec_output] then {
	if {![file exists $object]} then {
	    regexp ".*/(\[^/\]*)$" $source all dobj
	    regsub "\\.c" $dobj ".o" realobj
	    verbose "looking for $realobj"
	    if {[file exists $realobj]} then {
		send_log "mv $realobj $object\n"
		verbose "mv $realobj $object"
		catch "exec mv $realobj $object" exec_output
		if {![string match "" $exec_output]} then {
		    send_log "$exec_output\n"
		    verbose "$exec_output"
		    perror "could not move $realobj to $object"
		    return 0
		}
	    } else {
		perror "$object not found after compilation"
		return 0
	    }
	}
	return 1
    } else {
	send_log "$exec_output\n"
	verbose "$exec_output"
	perror "$source: compilation failed"
	return 0
    }
}

#
# default_ld_assemble
#	assemble a file
#
proc default_ld_assemble { as source object } {
    global ASFLAGS
    
    if {[which $as] == 0} then {
	perror "$as does not exist"
	return 0
    }

    if ![info exists ASFLAGS] { set ASFLAGS "" }

    send_log "$as $ASFLAGS -o $object $source\n"
    verbose "$as $ASFLAGS -o $object $source"

    catch "exec $as $ASFLAGS -o $object $source" exec_output
    if [string match "" $exec_output] then {
	return 1
    } else {
	send_log "$exec_output\n"
	verbose "$exec_output"
	perror "$source: assembly failed"
	return 0
    }
}

#
# default_ld_nm
#	run nm on a file, putting the result in the array nm_output
#
proc default_ld_nm { nm object } {
    global NMFLAGS
    global nm_output

    if {[which $nm] == 0} then {
	perror "$nm does not exist"
	return 0
    }

    if ![info exists NMFLAGS] { set NMFLAGS "" }

    send_log "$nm $NMFLAGS $object >tmpdir/nm.out\n"
    verbose "$nm $NMFLAGS $object >tmpdir/nm.out"

    catch "exec $nm $NMFLAGS $object >tmpdir/nm.out" exec_output
    if [string match "" $exec_output] then {
	set file [open tmpdir/nm.out r]
	while { [gets $file line] != -1 } {
	    verbose "$line" 2
	    if [regexp "^(\[0-9a-fA-F\]+) \[a-zA-Z0-9\] (.+)$" $line whole value name] {
		verbose "Setting nm_output($name) to 0x$value" 2
		set nm_output($name) 0x$value
	    }
	}
	close $file
	return 1
    } else {
	send_log "$exec_output\n"
	verbose $exec_output
	perror "$object: nm failed"
	return 0
    }
}

#
# simple_diff
#	compares two files line-by-line
#	returns differences if exist
#	returns null if file(s) cannot be opened
#
proc simple_diff { file_1 file_2 } {
    global target
	
    set eof -1
    set differences 0
    
    if [file exists $file_1] then {
	set file_a [open $file_1 r]
    } else {
	warning "$file_1 doesn't exist"
	return
    }
    
    if [file exists $file_2] then {
	set file_b [open $file_2 r]
    } else {
	fail "$file_2 doesn't exist"
	return
    }
    
    verbose "# Diff'ing: $file_1 $file_2\n" 2
    
    while { [gets $file_a line] != $eof } {
	if [regexp "^#.*$" $line] then {
	    continue
	} else {
	    lappend list_a $line
	}
    }
    close $file_a
    
    while { [gets $file_b line] != $eof } {
	if [regexp "^#.*$" $line] then {
	    continue
	} else {
	    lappend list_b $line
	}
    }
    close $file_b

    for { set i 0 } { $i < [llength $list_a] } { incr i } {
	set line_a [lindex $list_a $i]
	set line_b [lindex $list_b $i]

	verbose "\t$file_1: $i: $line_a\n" 3
	verbose "\t$file_2: $i: $line_b\n" 3
	if [string compare $line_a $line_b] then {
	    verbose "\t$file_1: $i: $line_a\n" 1
	    verbose "\t$file_2: $i: $line_b\n" 1

	    send_log "\t$file_1: $i: $line_a\n"
	    send_log "\t$file_2: $i: $line_b\n"

	    fail "Test: $target"
	    return
	}
    }
    
    if { [llength $list_a] != [llength $list_b] } {
	fail "Test: $target"
	return
    }

    if $differences<1 then {
	pass "Test: $target"
    }
}