#!/bin/sh
  # Generate tags or cscope files
  # Usage tags.sh <mode>
  #
  # mode may be any of: tags, TAGS, cscope
  #
  # Uses the following environment variables:
  # ARCH, SUBARCH, srctree, src, obj

  if [ "$KBUILD_VERBOSE" = "1" ]; then

  	set -x
  fi
  
  # This is a duplicate of RCS_FIND_IGNORE without escaped '()'
  ignore="( -name SCCS -o -name BitKeeper -o -name .svn -o \
            -name CVS  -o -name .pc       -o -name .hg  -o \
            -name .git )                                   \
            -prune -o"
  
  # Do not use full path is we do not use O=.. builds

  if [ "${KBUILD_SRC}" = "" ]; then

  	tree=
  else

  	tree=${srctree}/

  fi
  
  # find sources in arch/$ARCH
  find_arch_sources()
  {

  	find ${tree}arch/$1 $ignore -name "$2" -print;

  }
  
  # find sources in arch/$1/include
  find_arch_include_sources()
  {

  	find ${tree}arch/$1/include $ignore -name "$2" -print;

  }
  
  # find sources in include/
  find_include_sources()
  {

  	find ${tree}include $ignore -name config -prune -o -name "$1" -print;

  }
  
  # find sources in rest of tree
  # we could benefit from a list of dirs to search in here
  find_other_sources()
  {
  	find ${tree}* $ignore \
  	     \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \

  	       -name "$1" -print;

  }
  
  find_sources()
  {

  	find_arch_sources $1 "$2"
  	find_include_sources "$2"
  	find_other_sources "$2"

  }
  
  all_sources()
  {

  	find_sources $SRCARCH '*.[chS]'

  	if [ ! -z "$archinclude" ]; then

  		find_arch_include_sources $archinclude '*.[chS]'

  	fi
  }
  
  all_kconfigs()
  {

  	find_sources $SRCARCH 'Kconfig*'

  }
  
  all_defconfigs()
  {
  	find_sources $SRCARCH "defconfig"
  }
  
  docscope()
  {
  	(echo \-k; echo \-q; all_sources) > cscope.files
  	cscope -b -f cscope.out
  }
  
  exuberant()
  {

  	all_sources | xargs $1 -a                               \
  	-I __initdata,__exitdata,__acquires,__releases          \
  	-I __read_mostly,____cacheline_aligned                  \
  	-I ____cacheline_aligned_in_smp                         \
  	-I ____cacheline_internodealigned_in_smp                \
  	-I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL                      \
  	--extra=+f --c-kinds=+px                                \
  	--regex-asm='/^ENTRY\(([^)]*)\).*/\1/'
  
  	all_kconfigs | xargs $1 -a                              \
  	--langdef=kconfig --language-force=kconfig              \
  	--regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'
  
  	all_kconfigs | xargs $1 -a                              \
  	--langdef=kconfig --language-force=kconfig              \
  	--regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/CONFIG_\2/'
  
  	all_defconfigs | xargs -r $1 -a                         \
  	--langdef=dotconfig --language-force=dotconfig          \
  	--regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'
  
  }
  
  emacs()
  {
  	all_sources | xargs $1 -a
  
  	all_kconfigs | xargs $1 -a                              \
  	--regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'
  
  	all_kconfigs | xargs $1 -a                              \
  	--regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/CONFIG_\3/'
  
  	all_defconfigs | xargs -r $1 -a                         \
  	--regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'
  }
  
  xtags()
  {
  	if $1 --version 2>&1 | grep -iq exuberant; then
  		exuberant $1
  	elif $1 --version 2>&1 | grep -iq emacs; then
  		emacs $1
  	else
  		all_sources | xargs $1 -a
          fi
  }
  
  
  # Support um (which uses SUBARCH)

  if [ "${ARCH}" = "um" ]; then
  	if [ "$SUBARCH" = "i386" ]; then

  		archinclude=x86

  	elif [ "$SUBARCH" = "x86_64" ]; then

  		archinclude=x86
  	else
  		archinclude=${SUBARCH}
  	fi
  fi
  
  case "$1" in
  	"cscope")
  		docscope
  		;;
  
  	"tags")
  		xtags ctags
  		;;
  
  	"TAGS")
  		xtags etags
  		;;
  esac