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#!/bin/sh

# configure script for zlib. This script is needed only if

# you wish to build a shared library and your system supports them,

# of if you need special compiler, flags or install directory.

# Otherwise, you can just use directly "make test; make install"

#

# To create a shared library, use "configure --shared"; by default a static

# library is created. If the primitive shared library support provided here

# does not work, use ftp://prep.ai.mit.edu/pub/gnu/libtool-*.tar.gz

#

# To impose specific compiler or flags or install directory, use for example:

#    prefix=$HOME CC=cc CFLAGS="-O4" ./configure

# or for csh/tcsh users:

#    (setenv prefix $HOME; setenv CC cc; setenv CFLAGS "-O4"; ./configure)

# LDSHARED is the command to be used to create a shared library

# Incorrect settings of CC or CFLAGS may prevent creating a shared library.

# If you have problems, try without defining CC and CFLAGS before reporting

# an error.

LIBS=libz.a

LDFLAGS="-L. ${LIBS}"

VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`

VER2=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\)\\..*/\1/p' < zlib.h`

VER1=`sed -n -e '/VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < zlib.h`

AR=${AR-"ar rc"}

RANLIB=${RANLIB-"ranlib"}

prefix=${prefix-/usr/local}

exec_prefix=${exec_prefix-'${prefix}'}

libdir=${libdir-'${exec_prefix}/lib'}

includedir=${includedir-'${prefix}/include'}

mandir=${mandir-'${prefix}/share/man'}

shared_ext='.so'

shared=0

gcc=0

old_cc="$CC"

old_cflags="$CFLAGS"

while test $# -ge 1

do

case "$1" in

    -h* | --h*)

      echo 'usage:'

      echo '  configure [--shared] [--prefix=PREFIX]  [--exec_prefix=EXPREFIX]'

      echo '     [--libdir=LIBDIR] [--includedir=INCLUDEDIR]'

        exit 0;;

    -p*=* | --p*=*) prefix=`echo $1 | sed 's/[-a-z_]*=//'`; shift;;

    -e*=* | --e*=*) exec_prefix=`echo $1 | sed 's/[-a-z_]*=//'`; shift;;

    -l*=* | --libdir=*) libdir=`echo $1 | sed 's/[-a-z_]*=//'`; shift;;

    -i*=* | --includedir=*) includedir=`echo $1 | sed 's/[-a-z_]*=//'`;shift;;

    -p* | --p*) prefix="$2"; shift; shift;;

    -e* | --e*) exec_prefix="$2"; shift; shift;;

    -l* | --l*) libdir="$2"; shift; shift;;

    -i* | --i*) includedir="$2"; shift; shift;;

    -s* | --s*) shared=1; shift;;

    *) echo "unknown option: $1"; echo "$0 --help for help"; exit 1;;

    esac

done

test=ztest$$

cat > $test.c <<EOF

extern int getchar();

int hello() {return getchar();}

EOF

test -z "$CC" && echo Checking for gcc...

cc=${CC-gcc}

cflags=${CFLAGS-"-O3"}

# to force the asm version use: CFLAGS="-O3 -DASMV" ./configure

case "$cc" in

  *gcc*) gcc=1;;

esac

if test "$gcc" -eq 1 && ($cc -c $cflags $test.c) 2>/dev/null; then

  CC="$cc"

  SFLAGS=${CFLAGS-"-fPIC -O3"}

  CFLAGS="$cflags"

  case `(uname -s || echo unknown) 2>/dev/null` in

  Linux | linux | GNU | GNU/*) LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1"};;

  CYGWIN* | Cygwin* | cygwin* | OS/2* )

             EXE='.exe';;

  QNX*)  # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4

         # (alain.bonnefoy@icbt.com)

                 LDSHARED=${LDSHARED-"$cc -shared -Wl,-hlibz.so.1"};;

  HP-UX*)        LDSHARED=${LDSHARED-"$cc -shared $SFLAGS"}

                 shared_ext='.sl'

                 SHAREDLIB='libz.sl';;

  Darwin*)   shared_ext='.dylib'

             SHAREDLIB=libz$shared_ext

             SHAREDLIBV=libz.$VER$shared_ext

             SHAREDLIBM=libz.$VER1$shared_ext

             LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBV -compatibility_version $VER2 -current_version $VER"};;

  *)             LDSHARED=${LDSHARED-"$cc -shared"};;

  esac

else

  # find system name and corresponding cc options

  CC=${CC-cc}

  case `(uname -sr || echo unknown) 2>/dev/null` in

  HP-UX*)    SFLAGS=${CFLAGS-"-O +z"}

             CFLAGS=${CFLAGS-"-O"}

#            LDSHARED=${LDSHARED-"ld -b +vnocompatwarnings"}

             LDSHARED=${LDSHARED-"ld -b"}

             shared_ext='.sl'

             SHAREDLIB='libz.sl';;

  IRIX*)     SFLAGS=${CFLAGS-"-ansi -O2 -rpath ."}

             CFLAGS=${CFLAGS-"-ansi -O2"}

             LDSHARED=${LDSHARED-"cc -shared"};;

  OSF1\ V4*) SFLAGS=${CFLAGS-"-O -std1"}

             CFLAGS=${CFLAGS-"-O -std1"}

             LDSHARED=${LDSHARED-"cc -shared  -Wl,-soname,libz.so -Wl,-msym -Wl,-rpath,$(libdir) -Wl,-set_version,${VER}:1.0"};;

  OSF1*)     SFLAGS=${CFLAGS-"-O -std1"}

             CFLAGS=${CFLAGS-"-O -std1"}

             LDSHARED=${LDSHARED-"cc -shared"};;

  QNX*)      SFLAGS=${CFLAGS-"-4 -O"}

             CFLAGS=${CFLAGS-"-4 -O"}

             LDSHARED=${LDSHARED-"cc"}

             RANLIB=${RANLIB-"true"}

             AR="cc -A";;

  SCO_SV\ 3.2*) SFLAGS=${CFLAGS-"-O3 -dy -KPIC "}

             CFLAGS=${CFLAGS-"-O3"}

             LDSHARED=${LDSHARED-"cc -dy -KPIC -G"};;

  SunOS\ 5*) SFLAGS=${CFLAGS-"-fast -xcg89 -KPIC -R."}

             CFLAGS=${CFLAGS-"-fast -xcg89"}

             LDSHARED=${LDSHARED-"cc -G"};;

  SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"}

             CFLAGS=${CFLAGS-"-O2"}

             LDSHARED=${LDSHARED-"ld"};;

  UNIX_System_V\ 4.2.0)

             SFLAGS=${CFLAGS-"-KPIC -O"}

             CFLAGS=${CFLAGS-"-O"}

             LDSHARED=${LDSHARED-"cc -G"};;

  UNIX_SV\ 4.2MP)

             SFLAGS=${CFLAGS-"-Kconform_pic -O"}

             CFLAGS=${CFLAGS-"-O"}

             LDSHARED=${LDSHARED-"cc -G"};;

  OpenUNIX\ 5)

             SFLAGS=${CFLAGS-"-KPIC -O"}

             CFLAGS=${CFLAGS-"-O"}

             LDSHARED=${LDSHARED-"cc -G"};;

  AIX*)  # Courtesy of dbakker@arrayasolutions.com

             SFLAGS=${CFLAGS-"-O -qmaxmem=8192"}

             CFLAGS=${CFLAGS-"-O -qmaxmem=8192"}

             LDSHARED=${LDSHARED-"xlc -G"};;

  # send working options for other systems to support@gzip.org

  *)         SFLAGS=${CFLAGS-"-O"}

             CFLAGS=${CFLAGS-"-O"}

             LDSHARED=${LDSHARED-"cc -shared"};;

  esac

fi

SHAREDLIB=${SHAREDLIB-"libz$shared_ext"}

SHAREDLIBV=${SHAREDLIBV-"libz$shared_ext.$VER"}

SHAREDLIBM=${SHAREDLIBM-"libz$shared_ext.$VER1"}

if test $shared -eq 1; then

  echo Checking for shared library support...

  # we must test in two steps (cc then ld), required at least on SunOS 4.x

  if test "`($CC -c $SFLAGS $test.c) 2>&1`" = "" &&

     test "`($LDSHARED -o $test$shared_ext $test.o) 2>&1`" = ""; then

    CFLAGS="$SFLAGS"

    LIBS="$SHAREDLIBV"

    echo Building shared library $SHAREDLIBV with $CC.

  elif test -z "$old_cc" -a -z "$old_cflags"; then

    echo No shared library support.

    shared=0;

  else

    echo 'No shared library support; try without defining CC and CFLAGS'

    shared=0;

  fi

fi

if test $shared -eq 0; then

  LDSHARED="$CC"

  echo Building static library $LIBS version $VER with $CC.

else

  LDFLAGS="-L. ${SHAREDLIBV}"

fi

cat > $test.c <<EOF

#include <unistd.h>

int main() { return 0; }

EOF

if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then

  sed < zconf.in.h "/HAVE_UNISTD_H/s%0%1%" > zconf.h

  echo "Checking for unistd.h... Yes."

else

  cp -p zconf.in.h zconf.h

  echo "Checking for unistd.h... No."

fi

cat > $test.c <<EOF

#include <stdio.h>

#include <stdarg.h>

#include "zconf.h"

int main()

{

#ifndef STDC

  choke me

#endif

  return 0;

}

EOF

if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then

  echo "Checking whether to use vs[n]printf() or s[n]printf()... using vs[n]printf()"

  cat > $test.c <<EOF

#include <stdio.h>

#include <stdarg.h>

int mytest(char *fmt, ...)

{

  char buf[20];

  va_list ap;

  va_start(ap, fmt);

  vsnprintf(buf, sizeof(buf), fmt, ap);

  va_end(ap);

  return 0;

}

int main()

{

  return (mytest("Hello%d\n", 1));

}

EOF

  if test "`($CC $CFLAGS -o $test $test.c) 2>&1`" = ""; then

    echo "Checking for vsnprintf() in stdio.h... Yes."

    cat >$test.c <<EOF

#include <stdio.h>

#include <stdarg.h>

int mytest(char *fmt, ...)

{

  int n;

  char buf[20];

  va_list ap;

  va_start(ap, fmt);

  n = vsnprintf(buf, sizeof(buf), fmt, ap);

  va_end(ap);

  return n;

}

int main()

{

  return (mytest("Hello%d\n", 1));

}

EOF

    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then

      echo "Checking for return value of vsnprintf()... Yes."

    else

      CFLAGS="$CFLAGS -DHAS_vsnprintf_void"

      echo "Checking for return value of vsnprintf()... No."

      echo "  WARNING: apparently vsnprintf() does not return a value. zlib"

      echo "  can build but will be open to possible string-format security"

      echo "  vulnerabilities."

    fi

  else

    CFLAGS="$CFLAGS -DNO_vsnprintf"

    echo "Checking for vsnprintf() in stdio.h... No."

    echo "  WARNING: vsnprintf() not found, falling back to vsprintf(). zlib"

    echo "  can build but will be open to possible buffer-overflow security"

    echo "  vulnerabilities."

    cat >$test.c <<EOF

#include <stdio.h>

#include <stdarg.h>

int mytest(char *fmt, ...)

{

  int n;

  char buf[20];

  va_list ap;

  va_start(ap, fmt);

  n = vsprintf(buf, fmt, ap);

  va_end(ap);

  return n;

}

int main()

{

  return (mytest("Hello%d\n", 1));

}

EOF

    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then

      echo "Checking for return value of vsprintf()... Yes."

    else

      CFLAGS="$CFLAGS -DHAS_vsprintf_void"

      echo "Checking for return value of vsprintf()... No."

      echo "  WARNING: apparently vsprintf() does not return a value. zlib"

      echo "  can build but will be open to possible string-format security"

      echo "  vulnerabilities."

    fi

  fi

else

  echo "Checking whether to use vs[n]printf() or s[n]printf()... using s[n]printf()"

  cat >$test.c <<EOF

#include <stdio.h>

int mytest()

{

  char buf[20];

  snprintf(buf, sizeof(buf), "%s", "foo");

  return 0;

}

int main()

{

  return (mytest());

}

EOF

  if test "`($CC $CFLAGS -o $test $test.c) 2>&1`" = ""; then

    echo "Checking for snprintf() in stdio.h... Yes."

    cat >$test.c <<EOF

#include <stdio.h>

int mytest()

{

  char buf[20];

  return snprintf(buf, sizeof(buf), "%s", "foo");

}

int main()

{

  return (mytest());

}

EOF

    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then

      echo "Checking for return value of snprintf()... Yes."

    else

      CFLAGS="$CFLAGS -DHAS_snprintf_void"

      echo "Checking for return value of snprintf()... No."

      echo "  WARNING: apparently snprintf() does not return a value. zlib"

      echo "  can build but will be open to possible string-format security"

      echo "  vulnerabilities."

    fi

  else

    CFLAGS="$CFLAGS -DNO_snprintf"

    echo "Checking for snprintf() in stdio.h... No."

    echo "  WARNING: snprintf() not found, falling back to sprintf(). zlib"

    echo "  can build but will be open to possible buffer-overflow security"

    echo "  vulnerabilities."

    cat >$test.c <<EOF

#include <stdio.h>

int mytest()

{

  char buf[20];

  return sprintf(buf, "%s", "foo");

}

int main()

{

  return (mytest());

}

EOF

    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then

      echo "Checking for return value of sprintf()... Yes."

    else

      CFLAGS="$CFLAGS -DHAS_sprintf_void"

      echo "Checking for return value of sprintf()... No."

      echo "  WARNING: apparently sprintf() does not return a value. zlib"

      echo "  can build but will be open to possible string-format security"

      echo "  vulnerabilities."

    fi

  fi

fi

cat >$test.c <<EOF

#include <errno.h>

int main() { return 0; }

EOF

if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then

  echo "Checking for errno.h... Yes."

else

  echo "Checking for errno.h... No."

  CFLAGS="$CFLAGS -DNO_ERRNO_H"

fi

cat > $test.c <<EOF

#include <sys/types.h>

#include <sys/mman.h>

#include <sys/stat.h>

caddr_t hello() {

  return mmap((caddr_t)0, (off_t)0, PROT_READ, MAP_SHARED, 0, (off_t)0);

}

EOF

if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then

  CFLAGS="$CFLAGS -DUSE_MMAP"

  echo Checking for mmap support... Yes.

else

  echo Checking for mmap support... No.

fi

CPP=${CPP-"$CC -E"}

case $CFLAGS in

  *ASMV*)

    if test "`nm $test.o | grep _hello`" = ""; then

      CPP="$CPP -DNO_UNDERLINE"

      echo Checking for underline in external names... No.

    else

      echo Checking for underline in external names... Yes.

    fi;;

esac

rm -f $test.[co] $test $test$shared_ext

# udpate Makefile

sed < Makefile.in "

/^CC *=/s#=.*#=$CC#

/^CFLAGS *=/s#=.*#=$CFLAGS#

/^CPP *=/s#=.*#=$CPP#

/^LDSHARED *=/s#=.*#=$LDSHARED#

/^LIBS *=/s#=.*#=$LIBS#

/^SHAREDLIB *=/s#=.*#=$SHAREDLIB#

/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#

/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#

/^AR *=/s#=.*#=$AR#

/^RANLIB *=/s#=.*#=$RANLIB#

/^EXE *=/s#=.*#=$EXE#

/^prefix *=/s#=.*#=$prefix#

/^exec_prefix *=/s#=.*#=$exec_prefix#

/^libdir *=/s#=.*#=$libdir#

/^includedir *=/s#=.*#=$includedir#

/^mandir *=/s#=.*#=$mandir#

/^LDFLAGS *=/s#=.*#=$LDFLAGS#

" > Makefile