fixincludes

gcc库的原代码,对编程有很大帮助.

#! /bin/sh
# Install modified versions of certain ANSI-incompatible system header files
# which are fixed to work correctly with ANSI C
# and placed in a directory that GNU C will search.

# See README-fixinc for more information.

# Directory containing the original header files.
# (This was named INCLUDES, but that conflicts with a name in Makefile.in.)
INPUT=${2-${INPUT-/usr/include}}

# Directory in which to store the results.
LIB=${1?"fixincludes: output directory not specified"}

# Define PWDCMD as a command to use to get the working dir
# in the form that we want.
PWDCMD=pwd
case "`pwd`" in
//*)
	# On an Apollo, discard everything before `/usr'.
	PWDCMD="eval pwd | sed -e 's,.*/usr/,/usr/,'"
	;;
esac

# Original directory.
ORIGDIR=`${PWDCMD}`

# Make sure it exists.
if [ ! -d $LIB ]; then
  mkdir $LIB || exit 1
fi

# Make LIB absolute only if needed to avoid problems with the amd.
case $LIB in
/*)
	;;
*)
	cd $LIB; LIB=`${PWDCMD}`
	;;
esac

# Fail if no arg to specify a directory for the output.
if [ x$1 = x ]
then echo fixincludes: no output directory specified
exit 1
fi

echo Building fixed headers in ${LIB}

# Determine whether this system has symbolic links.
if ln -s X $LIB/ShouldNotExist 2>/dev/null; then
  rm -f $LIB/ShouldNotExist
  LINKS=true
elif ln -s X /tmp/ShouldNotExist 2>/dev/null; then
  rm -f /tmp/ShouldNotExist
  LINKS=true
else
  LINKS=false
fi

echo Finding directories and links to directories
cd ${INPUT}
# Find all directories and all symlinks that point to directories.
# Put the list in $files.
# Each time we find a symlink, add it to newdirs
# so that we do another find within the dir the link points to.
# Note that $files may have duplicates in it;
# later parts of this file are supposed to ignore them.
dirs="."
levels=2
while [ -n "$dirs" ] && [ $levels -gt 0 ]
do
    levels=`expr $levels - 1`
    newdirs=
    for d in $dirs
    do
	echo " Searching $INPUT/$d"
	if [ "$d" != . ]
	then
	    d=$d/.
	fi

	# Find all directories under $d, relative to $d, excluding $d itself.
        files="$files `find $d -type d -print | \
		       sed -e '/\/\.$/d' -e '/^\.$/d'`"
	# Find all links to directories.
	# Using `-exec test -d' in find fails on some systems,
	# and trying to run test via sh fails on others,
	# so this is the simplest alternative left.
	# First find all the links, then test each one.
	theselinks=
	$LINKS && \
	  theselinks=`find $d -type l -print`
	for d1 in $theselinks --dummy--
	do
	    # If the link points to a directory,
	    # add that dir to $newdirs
	    if [ -d $d1 ]
	    then
		files="$files $d1"
		if [ "`ls -ld $d1 | sed -n 's/.*-> //p'`" != "." ]
		then
		    newdirs="$newdirs $d1"
		fi
	    fi
	done
    done

    dirs="$newdirs"
done

dirs=
echo "All directories (including links to directories):"
echo $files

for file in $files; do
  rm -rf $LIB/$file
  if [ ! -d $LIB/$file ]
  then mkdir $LIB/$file
  fi
done
mkdir $LIB/root

# treetops gets an alternating list
# of old directories to copy
# and the new directories to copy to.
treetops="${INPUT} ${LIB}"

if $LINKS; then
  echo 'Making symbolic directory links'
  for file in $files; do
    dest=`ls -ld $file | sed -n 's/.*-> //p'`
    if [ "$dest" ]; then    
      cwd=`${PWDCMD}`
      # In case $dest is relative, get to $file's dir first.
      cd ${INPUT}
      cd `echo ./$file | sed -n 's&[^/]*$&&p'`
      # Check that the target directory exists.
      # Redirections changed to avoid bug in sh on Ultrix.
      (cd $dest) > /dev/null 2>&1
      if [ $? = 0 ]; then
	cd $dest
	# X gets the dir that the link actually leads to.
	x=`${PWDCMD}`
	# Canonicalize ${INPUT} now to minimize the time an
	# automounter has to change the result of ${PWDCMD}.
	cinput=`cd ${INPUT}; ${PWDCMD}`
	# If a link points to ., make a similar link to .
	if [ $x = ${cinput} ]; then
	  echo $file '->' . ': Making link'
	  rm -fr ${LIB}/$file > /dev/null 2>&1
	  ln -s . ${LIB}/$file > /dev/null 2>&1
	# If link leads back into ${INPUT},
	# make a similar link here.
	elif expr $x : "${cinput}/.*" > /dev/null; then
	  # Y gets the actual target dir name, relative to ${INPUT}.
	  y=`echo $x | sed -n "s&${cinput}/&&p"`
	  # DOTS is the relative path from ${LIB}/$file's dir back to ${LIB}.
	  dots=`echo "$file" |
	    sed -e 's@^./@@' -e 's@/./@/@g' -e 's@[^/][^/]*@..@g' -e 's@..$@@'`
	  echo $file '->' $dots$y ': Making link'
	  rm -fr ${LIB}/$file > /dev/null 2>&1
	  ln -s $dots$y ${LIB}/$file > /dev/null 2>&1
	else
	  # If the link is to a dir $target outside ${INPUT},
	  # repoint the link at ${INPUT}/root$target
	  # and process $target into ${INPUT}/root$target
	  # treat this directory as if it actually contained the files.
	  echo $file '->' root$x ': Making link'
	  if [ -d $LIB/root$x ]
	  then true
	  else
	    dirname=root$x/
	    dirmade=.
	    cd $LIB
	    while [ x$dirname != x ]; do
	      component=`echo $dirname | sed -e 's|/.*$||'`
	      mkdir $component >/dev/null 2>&1
	      cd $component
	      dirmade=$dirmade/$component
	      dirname=`echo $dirname | sed -e 's|[^/]*/||'`
	    done
	  fi
	  # Duplicate directory structure created in ${LIB}/$file in new
	  # root area.
	  for file2 in $files; do
	    case $file2 in
	      $file/./*)
		dupdir=${LIB}/root$x/`echo $file2 | sed -n "s|^${file}/||p"`
		echo "Duplicating ${file}'s ${dupdir}"
		if [ -d ${dupdir} ]
		then true
		else
		  mkdir ${dupdir}
		fi
		;;
	      *)
		;;
	    esac
          done
	  # Get the path from ${LIB} to $file, accounting for symlinks.
	  parent=`echo "$file" | sed -e 's@/[^/]*$@@'`
	  libabs=`cd ${LIB}; ${PWDCMD}`
	  file2=`cd ${LIB}; cd $parent; ${PWDCMD} | sed -e "s@^${libabs}@@"`
	  # DOTS is the relative path from ${LIB}/$file's dir back to ${LIB}.
	  dots=`echo "$file2" | sed -e 's@/[^/]*@../@g'`
	  rm -fr ${LIB}/$file > /dev/null 2>&1
	  ln -s ${dots}root$x ${LIB}/$file > /dev/null 2>&1
	  treetops="$treetops $x ${LIB}/root$x"
	fi
      fi
      cd $cwd
    fi
  done
fi

required=
set x $treetops
shift
while [ $# != 0 ]; do
  # $1 is an old directory to copy, and $2 is the new directory to copy to.
  cd ${INPUT}
  cd $1
# The same dir can appear more than once in treetops.
# There's no need to scan it more than once.
  if [ -f $2/DONE ]
  then
    files=
  else
    touch $2/DONE
    echo Fixing directory $1 into $2
# Check .h files which are symlinks as well as those which are files.
# A link to a header file will not be processed by anything but this.
    if $LINKS; then
      files=`find . -name '*.h' \( -type f -o -type l \) -print`
    else
      files=`find . -name '*.h' -type f -print`
    fi
    echo Checking header files
  fi
# Note that BSD43_* are used on recent MIPS systems.
  for file in $files; do
# This call to egrep is essential, since checking a file with egrep
# is much faster than actually trying to fix it.
# It is also essential that most files *not* match!
# Thus, matching every #endif is unacceptable.
# But the argument to egrep must be kept small, or many versions of egrep
# won't be able to handle it.
#
# We use the pattern [!-.0-~] instead of [^/ 	] to match a noncomment
# following #else or #endif because some buggy egreps think [^/] matches
# newline, and they thus think `#else ' matches `#e[ndiflse]*[ 	]+[^/ 	]'.
#
# We use the pattern [^a-zA-Z0-9_][_a-ce-km-z][a-z0-9] to match an identifier
# following #if or #elif that is not surrounded by __.  The `a-ce-km-z'
# in this pattern lacks `d' and `l'; this means we don't worry about
# identifiers starting with `d' or `l'.  This is OK, since none of the
# identifiers below start with `d' or `l'.  It also greatly improves
# performance, since many files contain lines of the form `#if ... defined ...'
# or `#if lint'.
    if egrep '//|[ 	_]_IO|CTRL|^#define.NULL|^#e[nl][ds][ief]*[ 	]+[!-.0-~]|^#[el]*if.*[^a-zA-Z0-9_][_a-ce-km-zA-Z][a-zA-Z0-9]' $file >/dev/null; then
      if [ -r $file ]; then
	cp $file $2/$file >/dev/null 2>&1	\
	|| echo "Can't copy $file"
	chmod +w $2/$file
	chmod a+r $2/$file
	# Here is how the sed commands in braces work.
	# (It doesn't work to put the comments inside the sed commands.)
		# Surround each word with spaces, to simplify matching below.
		# ANSIfy each pre-ANSI machine-dependent symbol
		# by surrounding it with __ __.
		# Remove the spaces that we inserted around each word.
	sed -e '
				   :loop
	  /\\$/			N
	  /\\$/			b loop
	  s%^\([ 	]*#[ 	]*else\)[ 	]*/[^*].*%\1%
	  s%^\([ 	]*#[ 	]*else\)[ 	]*[^/ 	].*%\1%
	  s%^\([ 	]*#[ 	]*endif\)[ 	]*/[^*].*%\1%
	  s%^\([ 	]*#[ 	]*endif\)[ 	]*\*[^/].*%\1%
	  s%^\([ 	]*#[ 	]*endif\)[ 	]*[^/* 	].*%\1%
	  /\/\/[^*]/			s|//\(.*\)$|/*\1*/|
	  /[ 	]_IO[A-Z]*[ 	]*(/	s/\(_IO[A-Z]*[ 	]*(\)\(.\),/\1'\''\2'\'',/
	  /[ 	]BSD43__IO[A-Z]*[ 	]*(/	s/(\(.\),/('\''\1'\'',/
	  /#define._IO/			s/'\''\([cgxtf]\)'\''/\1/g
	  /#define.BSD43__IO/		s/'\''\([cgx]\)'\''/\1/g
	  /[^A-Z0-9_]CTRL[ 	]*(/		s/\([^'\'']\))/'\''\1'\'')/
	  /[^A-Z0-9]_CTRL[ 	]*(/		s/\([^'\'']\))/'\''\1'\'')/
	  /#define[ 	]*[ 	]CTRL/		s/'\''\([cgx]\)'\''/\1/g
	  /#define[ 	]*[ 	]_CTRL/		s/'\''\([cgx]\)'\''/\1/g
	  /#define.BSD43_CTRL/		s/'\''\([cgx]\)'\''/\1/g
	  /#[	 ]*[el]*if/{
		s/[a-zA-Z0-9_][a-zA-Z0-9_]*/ & /g

		s/ bsd4\([0-9]\) / __bsd4\1__ /g
		s/ _*host_mips / __host_mips__ /g
		s/ _*i386 / __i386__ /g
		s/ M32 / __M32__ /g
		s/ is68k / __is68k__ /g
		s/ m68k / __m68k__ /g
		s/ mc680\([0-9]\)0 / __mc680\10__ /g
		s/ m88k / __m88k__ /g
		s/ _*mips / __mips__ /g
		s/ news\([0-9]*\) / __news\1__ /g
		s/ ns32000 / __ns32000__ /g
		s/ pdp11 / __pdp11__ /g
		s/ pyr / __pyr__ /g
		s/ sel / __sel__ /g
		s/ sony_news / __sony_news__ /g
		s/ sparc / __sparc__ /g
		s/ sun\([a-z0-9]*\) / __sun\1__ /g
		s/ tahoe / __tahoe__ /g
		s/ tower\([_0-9]*\) / __tower\1__ /g
		s/ u370 / __u370__ /g
		s/ u3b\([0-9]*\) / __u3b\1__ /g
		s/ unix / __unix__ /g
		s/ vax / __vax__ /g
		s/ _*MIPSE\([LB]\) / __MIPSE\1__ /g
		s/ _*\([Rr][34]\)000 / __\1000__ /g
		s/ _*SYSTYPE_\([A-Z0-9]*\) / __SYSTYPE_\1__ /g

		s/ \([a-zA-Z0-9_][a-zA-Z0-9_]*\) /\1/g
	  }
	  /^#define.NULL[ 	]/	i\
		#undef NULL
	' $2/$file > $2/$file.
	mv $2/$file. $2/$file
	if cmp $file $2/$file >/dev/null 2>&1 \
	    || egrep 'This file is part of the GNU C Library' $2/$file >/dev/null 2>&1; then
	   rm $2/$file
	else
	   echo Fixed $file
	   # Find any include directives that use "file".
	   for include in `egrep '^[ 	]*#[ 	]*include[ 	]*"[^/]' $2/$file | sed -e 's/^[ 	]*#[ 	]*include[ 	]*"\([^"]*\)".*$/\1/'`; do
	      dir=`echo $file | sed -e s'|/[^/]*$||'`
	      required="$required $1 $dir/$include $2/$dir/$include"
	   done
	fi
      fi
    fi
  done
  shift; shift
done

cd ${INPUT}

# Install the proper definition of the three standard types in header files
# that they come from.
for file in sys/types.h stdlib.h sys/stdtypes.h stddef.h memory.h unistd.h; do
  if [ -r $file ] && [ ! -r ${LIB}/$file ]; then
    cp $file ${LIB}/$file >/dev/null 2>&1 || echo "Can't copy $file"
    chmod +w ${LIB}/$file 2>/dev/null
    chmod a+r ${LIB}/$file 2>/dev/null
  fi

  if [ -r ${LIB}/$file ]; then
    echo Fixing size_t, ptrdiff_t and wchar_t in $file
    sed \
      -e '/typedef[ 	][ 	]*[a-z_][ 	a-z_]*[ 	]size_t/i\
#ifndef __SIZE_TYPE__\
#define __SIZE_TYPE__ long unsigned int\
#endif
' \
      -e 's/typedef[ 	][ 	]*[a-z_][ 	a-z_]*[ 	]size_t/typedef __SIZE_TYPE__ size_t/' \
      -e '/typedef[ 	][ 	]*[a-z_][ 	a-z_]*[ 	]ptrdiff_t/i\
#ifndef __PTRDIFF_TYPE__\
#define __PTRDIFF_TYPE__ long int\
#endif
' \
      -e 's/typedef[ 	][ 	]*[a-z_][ 	a-z_]*[ 	]ptrdiff_t/typedef __PTRDIFF_TYPE__ ptrdiff_t/' \
      -e '/typedef[ 	][ 	]*[a-z_][ 	a-z_]*[ 	]wchar_t/i\