#!/bin/sh
# Copyright (C) 1992, 1993 Free Software Foundation
# 
# This file is part of the GNU IO Library.  This library is free
# software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option)
# any later version.
# 
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with GNU CC; see the file COPYING.  If not, write to
# the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

#    Written by Per Bothner (bothner@cygnus.com)

# This is a shell-script that figures out various things about a
# system, and writes (to stdout) a C-style include files with
# suitable definitions, including all the standard Posix types.
# It works by compiling various test programs -- some are run through
# the C pre-processor, and the output examined.
# The test programs are only compiled, not executed, so the script
# should even if you're cross-compiling.
# It uses $CC (which defaults to cc) to compile C programs (extension .c),
# and $CXX (which defaults to gcc) to compile C++ programs (extension .C).
# The shell-script is written for libg++.a.

# Usage: gen-params [NAME1=name1 ...]
# - where an assignment (such as size_t="unsigned int" means to
# use that value, instead of trying to figure it out.

# Uncomment following line for debugging
# set -x

SED=sed

# Evaluate the arguments (which should be assignments):
for arg in "$@"; do
  # Quote arg (i.e. FOO=bar => FOO='bar'), then eval it.
  eval `echo "$arg" | ${SED} -e "s|^\(.*\)=\(.*\)|\1='\2'|"`
done

macro_prefix=${macro_prefix-"_G_"}
rootdir=`pwd`/..
gccdir=${gccdir-${rootdir}/gcc}
binutilsdir=${binutilsdir-${rootdir}/binutils}
CC=${CC-`if [ -f ${gccdir}/xgcc ] ; \
	then echo ${gccdir}/xgcc -B${gccdir}/ -I${gccdir}/include ; \
	else echo cc ; fi`}
CXX=${CXX-`if [ -f ${gccdir}/xgcc ] ; \
	then echo ${gccdir}/xgcc -B${gccdir}/ -I${gccdir}/include ; \
	else echo gcc ; fi`}
CPP=${CPP-`echo ${CC} -E`}
CONFIG_NM=${CONFIG_NM-`if [ -f ${binutilsdir}/nm ] ; \
	then echo ${binutilsdir}/nm ; \
	else echo nm ; fi`}

cat <<!EOF!
/* AUTOMATICALLY GENERATED; DO NOT EDIT! */ 
#ifndef ${macro_prefix}config_h
#define ${macro_prefix}config_h
!EOF!

if [ x"${LIB_VERSION}" != "x" ] ; then
  echo "#define ${macro_prefix}LIB_VERSION" '"'${LIB_VERSION}'"'
fi

# This program is used to test if the compiler prepends '_' before identifiers.
# It is also used to check the g++ uses '$' or '.' various places.

if test -z "${NAMES_HAVE_UNDERSCORE}" -o -z "${DOLLAR_IN_LABEL}" ; then
  cat >dummy.C <<!EOF!
  struct filebuf {
      virtual int foo();
  };
  filebuf ff;
  extern "C" int FUNC(int);
  int FUNC(int i) { return i+10; }
!EOF!

  if ${CXX} -c dummy.C ; then
    if test -n "${NAMES_HAVE_UNDERSCORE}" ; then
     echo "#define ${macro_prefix}NAMES_HAVE_UNDERSCORE ${NAMES_HAVE_UNDERSCORE}"
    elif test "`${CONFIG_NM} dummy.o | grep _FUNC`" != ""; then
      echo "#define ${macro_prefix}NAMES_HAVE_UNDERSCORE 1"
    elif test "`${CONFIG_NM} dummy.o | grep FUNC`" != ""; then
      echo "#define ${macro_prefix}NAMES_HAVE_UNDERSCORE 0"
    else
      echo "${CONFIG_NM} failed to find FUNC in dummy.o!" 1>&2; exit -1;
    fi

#    if test -n "${DOLLAR_IN_LABEL}" ; then
#      echo "#define ${macro_prefix}DOLLAR_IN_LABEL ${DOLLAR_IN_LABEL}"
#    elif test "`${CONFIG_NM} dummy.o | grep 'vt[$$]7filebuf'`" != ""; then
#      echo "#define ${macro_prefix}DOLLAR_IN_LABEL 1"
#    elif test "`${CONFIG_NM} dummy.o | grep 'vt[.]7filebuf'`" != ""; then
#      echo "#define ${macro_prefix}DOLLAR_IN_LABEL 0"
#    elif test "`${CONFIG_NM} dummy.o | grep 'vtbl__7filebuf'`" != ""; then
#      echo "#define ${macro_prefix}DOLLAR_IN_LABEL 0"
#    else
#      echo "gen-params: ${CONFIG_NM} failed to find vt[.\$]filebuf in dummy.o!" 1>&2; exit 1
#    fi
  else
    # The compile failed for some reason (no C++?)
    echo "gen-params: could not compile dummy.C with ${CXX}" 1>&2; exit 1;
  fi
fi

# A little test program to check if struct stat has st_blksize.
cat >dummy.c <<!EOF!
#include <sys/types.h>
#include <sys/stat.h>
int BLKSIZE(struct stat *st)
{
    return st->st_blksize;
}
!EOF!

if ${CC} -c dummy.c >/dev/null 2>&1 ; then
  echo "#define ${macro_prefix}HAVE_ST_BLKSIZE 1"
else
  echo "#define ${macro_prefix}HAVE_ST_BLKSIZE 0"
fi

# Next, generate definitions for the standard types (such as mode_t)
# compatible with those in the standard C header files.
# It works by a dummy program through the C pre-processor, and then
# using sed to search for typedefs in the output.

cat >dummy.c <<!EOF!
#include <sys/types.h>
#include <stddef.h>
#include <stdarg.h>
#include <stdio.h>
#include <time.h>
#include <signal.h>
#ifdef size_t
typedef size_t Xsize_t;
#elif defined(__SIZE_TYPE__)
typedef __SIZE_TYPE__ Xsize_t;
#endif
#ifdef ptrdiff_t
typedef ptrdiff_t Xptrdiff_t;
#elif defined(__PTRDIFF_TYPE__)
typedef __PTRDIFF_TYPE__ Xptrdiff_t;
#endif
#ifdef wchar_t
typedef wchar_t Xwchar_t;
#elif defined(__WCHAR_TYPE__)
typedef __WCHAR_TYPE__ Xwchar_t;
#endif
#ifdef va_list
typedef va_list XXXva_list;
#endif
#ifdef BUFSIZ
int XBUFSIZ=BUFSIZ;
#endif
#ifdef FOPEN_MAX
int XFOPEN_MAX=FOPEN_MAX;
#endif
#ifdef FILENAME_MAX
int XFILENAME_MAX=FILENAME_MAX;
#endif
!EOF!

if ${CPP} dummy.c >TMP ; then true
else
  echo "gen-params: could not invoke ${CPP} on dummy.c" 1>&2 ; exit 1
fi
tr '	' ' ' <TMP >dummy.out

for TYPE in dev_t clock_t fpos_t gid_t ino_t mode_t nlink_t off_t pid_t ptrdiff_t sigset_t size_t ssize_t time_t uid_t va_list wchar_t int32_t uint_32_t ; do
    IMPORTED=`eval 'echo $'"$TYPE"`
    if [ -n "${IMPORTED}" ] ; then
	eval "$TYPE='$IMPORTED"
    else
	# Search dummy.out for a typedef for $TYPE, and write it out
	# to TMP in #define syntax.
	rm -f TMP
	${SED} -n -e "s|.*typedef  *\(.*\) X*$TYPE *;.*|\1|w TMP" \
	  <dummy.out>/dev/null
	# Now select the first definition.
        if [ -s TMP ]; then
	    # VALUE is now the typedef'd definition of $TYPE.
            eval "VALUE='`${SED} -e 's| *$||' -e '2,$d' <TMP`'"
	    # Unless VALUE contains a blank, look for a typedef for it
	    # in turn (this could be a loop, but that would be over-kill).
	    if echo $VALUE | grep " " >/dev/null ; then true
	    else
		rm -f TMP
		${SED} -n -e "s|.*typedef[ 	][ 	]*\(.*[^a-zA-Z0-9_]\)${VALUE}[ 	]*;.*|\1|w TMP" <dummy.out>/dev/null
		if [ -s TMP ]; then
		    eval "VALUE='`${SED} -e '2,$d' -e 's|[ 	]*$||' <TMP`'"
		fi
	    fi
	    eval "$TYPE='$VALUE'"
	fi
    fi
done

cat <<!EOF!
typedef ${clock_t-int /* default */} ${macro_prefix}clock_t;
typedef ${dev_t-int /* default */} ${macro_prefix}dev_t;
typedef ${fpos_t-long /* default */} ${macro_prefix}fpos_t;
typedef ${gid_t-int /* default */} ${macro_prefix}gid_t;
typedef ${ino_t-int /* default */} ${macro_prefix}ino_t;
typedef ${mode_t-int /* default */} ${macro_prefix}mode_t;
typedef ${nlink_t-int /* default */} ${macro_prefix}nlink_t;
typedef ${off_t-long /* default */} ${macro_prefix}off_t;
typedef ${pid_t-int /* default */} ${macro_prefix}pid_t;
typedef ${ptrdiff_t-long int /* default */} ${macro_prefix}ptrdiff_t;
typedef ${sigset_t-int /* default */} ${macro_prefix}sigset_t;
typedef ${size_t-unsigned long /* default */} ${macro_prefix}size_t;
typedef ${time_t-int /* default */} ${macro_prefix}time_t;
typedef ${uid_t-int /* default */} ${macro_prefix}uid_t;
typedef ${wchar_t-int /* default */} ${macro_prefix}wchar_t;
typedef ${int32_t-int /* default */} ${macro_prefix}int32_t;
typedef ${uint32_t-unsigned int /* default */} ${macro_prefix}uint32_t;
!EOF!


# ssize_t is the signed version of size_t
if [ -n "${ssize_t}" ] ; then
    echo "typedef ${ssize_t} ${macro_prefix}ssize_t;"
elif [ -z "${size_t}" ] ; then
    echo "typedef long ${macro_prefix}ssize_t;"
else
    # Remove "unsigned" from ${size_t} to get ${ssize_t}.
    tmp="`echo ${size_t} | ${SED} -e 's|unsigned||g' -e 's|  | |g'`"
    if [ -z "$tmp" ] ; then
	tmp=int
    else
	# check $tmp doesn't conflict with <unistd.h>
	echo "#include <unistd.h>
	extern $tmp read();" >dummy.c
	${CC} -c dummy.c >/dev/null 2>&1 || tmp=int
    fi
    echo "typedef $tmp /* default */ ${macro_prefix}ssize_t;"
fi

# va_list can cause problems (e.g. some systems have va_list as a struct).
# Check to see if ${va_list-char*} really is compatible with stdarg.h.
cat >dummy.C <<!EOF!
#define X_va_list ${va_list-char* /* default */}
extern long foo(X_va_list ap); /* Check that X_va_list compiles on its own */
extern "C" {
#include <stdarg.h>
}
long foo(X_va_list ap) { return va_arg(ap, long); }
long bar(int i, ...)
{ va_list ap; long j; va_start(ap, i); j = foo(ap); va_end(ap); return j; }
!EOF!
if ${CXX} -c dummy.C >/dev/null 2>&1 ; then
  # Ok: We have something that works.
  echo "typedef ${va_list-char* /* default */} ${macro_prefix}va_list;"
else
  # No, it breaks.  Indicate that <stdarg.h> must be included.
  echo "#define ${macro_prefix}NEED_STDARG_H
#define ${macro_prefix}va_list va_list"
fi

cat >dummy.c <<!EOF!
#include <signal.h>
extern int (*signal())();
extern int dummy (int);
main()
{
    int (*oldsig)(int) = signal (1, dummy);
    (void) signal (2, oldsig);
    return 0;
}
!EOF!
if ${CC} -c dummy.c >/dev/null 2>&1 ; then
  echo "#define ${macro_prefix}signal_return_type int"
else
  echo "#define ${macro_prefix}signal_return_type void"
fi

# check sprintf return type

cat >dummy.c <<!EOF!
#include <stdio.h>
extern int sprintf(); char buf[100];
int main() { return sprintf(buf, "%d", 34); }
!EOF!
if ${CC} -c dummy.c >/dev/null 2>&1 ; then
  echo "#define ${macro_prefix}sprintf_return_type int"
else
  echo "#define ${macro_prefix}sprintf_return_type char*"
fi

# Look for some standard macros
for NAME in BUFSIZ FOPEN_MAX FILENAME_MAX NULL ; do
    IMPORTED=`eval 'echo $'"$NAME"`
    if [ -n "${IMPORTED}" ] ; then
	eval "$NAME='$IMPORTED /* specified */"
    else
	rm -f TMP
	${SED} -n -e "s|int X${NAME}=\(.*\);|\1|w TMP" <dummy.out>/dev/null
	# Now select the first definition.
	if [ -s TMP ]; then
	    eval "$NAME='"`${SED} -e '2,$d' <TMP`"'"
	fi
    fi
done

cat <<!EOF!
#define ${macro_prefix}BUFSIZ ${BUFSIZ-1024 /* default */}
#define ${macro_prefix}FOPEN_MAX ${FOPEN_MAX-32 /* default */}
#define ${macro_prefix}FILENAME_MAX ${FILENAME_MAX-1024 /* default */}
#define ${macro_prefix}NULL ${NULL-0 /* default */}
#define ${macro_prefix}ARGS(ARGLIST) (...)
!EOF!

rm -f dummy.c dummy.o

if test -n "${HAVE_ATEXIT}" ; then
 echo "#define ${macro_prefix}HAVE_ATEXIT ${HAVE_ATEXIT}"
else
  cat >dummy.c <<!EOF!
#include <stdlib.h>
int main()
{
  atexit (0);
}
!EOF!
  if ${CC} dummy.c >/dev/null 2>&1 ; then
    echo "#define ${macro_prefix}HAVE_ATEXIT 1"
  else
    echo "#define ${macro_prefix}HAVE_ATEXIT 0"
  fi
fi


# *** Check for presence of certain include files ***

# check for sys/resource.h

if test -n "${HAVE_SYS_RESOURCE}" ; then
 echo "#define ${macro_prefix}HAVE_SYS_RESOURCE ${HAVE_SYS_RESOURCE}"
else
  cat >dummy.c <<!EOF!
#include <sys/time.h>
#include <sys/resource.h>
  int main()
  {
    struct rusage res;
    getrusage(RUSAGE_SELF, &res);
    return (int)(res.ru_utime.tv_sec + (res.ru_utime.tv_usec / 1000000.0));
  }
!EOF!
  # Note: We link because some systems have sys/resource, but not getrusage().
  if ${CC} dummy.c >/dev/null 2>&1 ; then
    echo "#define ${macro_prefix}HAVE_SYS_RESOURCE 1"
  else
    echo "#define ${macro_prefix}HAVE_SYS_RESOURCE 0"
  fi
fi

# check for sys/socket.h

if test -n "${HAVE_SYS_SOCKET}" ; then
 echo "#define ${macro_prefix}HAVE_SYS_SOCKET ${HAVE_SYS_SOCKET}"
else
  echo '#include <sys/types.h>' >dummy.c
  echo '#include <sys/socket.h>' >>dummy.c
  if ${CC} -c dummy.c >/dev/null 2>&1 ; then
    echo "#define ${macro_prefix}HAVE_SYS_SOCKET 1"
  else
    echo "#define ${macro_prefix}HAVE_SYS_SOCKET 0"
  fi
fi

# Check for a (Posix-compatible) sys/wait.h */

if test -n "${HAVE_SYS_WAIT}" ; then
 echo "#define ${macro_prefix}HAVE_SYS_WAIT ${HAVE_SYS_WAIT}"
else
  cat >dummy.C <<!EOF!
  extern "C" {
#include <sys/types.h>
#include <sys/wait.h>
  }
  int f() { int i; wait(&i); return i; }
!EOF!
#define ${macro_prefix}HAVE_UNION_WAIT 1"
  if ${CXX} -c dummy.C >/dev/null 2>&1 ; then
    echo "#define ${macro_prefix}HAVE_SYS_WAIT 1"
  else
    echo "#define ${macro_prefix}HAVE_SYS_WAIT 0"
  fi
fi

if test -n "${HAVE_UNISTD}" ; then
 echo "#define ${macro_prefix}HAVE_UNISTD ${HAVE_UNISTD}"
else
  echo '#include <unistd.h>' >dummy.c
  if ${CC} -c dummy.c >/dev/null 2>&1 ; then
    echo "#define ${macro_prefix}HAVE_UNISTD 1"
  else
    echo "#define ${macro_prefix}HAVE_UNISTD 0"
  fi
fi

if test -n "${HAVE_DIRENT}" ; then
 echo "#define ${macro_prefix}HAVE_DIRENT ${HAVE_DIRENT}"
else
  echo '#include <sys/types.h>
#include <dirent.h>' >dummy.c
  if ${CC} -c dummy.c >/dev/null 2>&1 ; then
    echo "#define ${macro_prefix}HAVE_DIRENT 1"
  else
    echo "#define ${macro_prefix}HAVE_DIRENT 0"
  fi
fi

if test -n "${HAVE_CURSES}" ; then
 echo "#define ${macro_prefix}HAVE_CURSES ${HAVE_CURSES}"
else
  echo '#include <curses.h>' >dummy.c
  if ${CC} -c dummy.c >/dev/null 2>&1 ; then
    echo "#define ${macro_prefix}HAVE_CURSES 1"
  else
    echo "#define ${macro_prefix}HAVE_CURSES 0"
  fi
fi

# There is no test for this at the moment; it is just set by the
# configuration files.
if test -n "${MATH_H_INLINES}" ; then
  echo "#define ${macro_prefix}MATH_H_INLINES ${MATH_H_INLINES}"
else
  echo "#define ${macro_prefix}MATH_H_INLINES 0"
fi

# Uncomment the following line if you don't have working templates.
# echo "#define ${macro_prefix}NO_TEMPLATES"

rm -f dummy.C dummy.o dummy.c dummy.out TMP core a.out

echo "#endif /* !${macro_prefix}config_h */"
