#!/bin/sh
#
# The shell script for bc to automatically create the config.h file.
# 
# Syntax:  configure [ include-dir [ lib-file [ c-compiler ]]]
#
# Set some standard things.
#
INCLUDE=${1-/usr/include}
LIBFILE=${2-libmath.b}
CC=${3-cc}
#
# Initialize the exit status
#
EXIT=0
#
# Remove the current copy and make sure there is at least an empty file
#
rm -f config.h
echo "/* config.h */" > config.h
#
# Check for the argument passing mechanism.
#
if test -r $INCLUDE/varargs.h
then
echo "Using varargs.h for variable arguments (non ansi compilers). "
echo "#ifndef __STDC__" >> config.h
echo "#define VARARGS" >> config.h
echo "#endif" >> config.h
else
if test -r $INCLUDE/stdarg.h
then
echo "Using stdarg.h for variable arguments. "
else
echo "Unknown variable argument mechanism. "
EXIT=1
fi
fi
#
# Limits file?
#
if test -r $INCLUDE/limits.h
then
echo "You have a limits.h file."
else
echo "You need to check the limits in const.h."
echo "#define NO_LIMITS" >> config.h
fi
#
# unistd?
#
if test -r $INCLUDE/unistd.h
then
echo "You have a unistd.h file."
else
echo "#define NO_UNISTD" >> config.h
fi
#
# Stdlib?
#
if test -r $INCLUDE/stdlib.h
then
echo "You have a stdlib.h file."
else
echo "#define NO_STDLIB" >> config.h
fi
#
# Strinog?
#
if test -r $INCLUDE/string.h
then
echo "You have a string.h file."
else
echo "#define STRINGS_H" >> config.h
fi
#
# At least one BSD system did not define "extern int errno;" in errno.h
#
if grep -s extern $INCLUDE/errno.h
then
true
else
echo "extern int errno;" >> config.h
fi
#
# On MINIX pc systems we want to define some extra files.
#
if test -r $INCLUDE/minix
then
# We must be on a minix system.  Check for the machine type.
if test `machine` = IBM_PC
then
echo "#define SMALL_BUF" >> config.h
echo "#define BC_MATH_FILE \"$LIBFILE\"" >> config.h
echo "#define SHORTNAMES" >> config.h
else
echo "Your Minix is not on a PC.  The bc library will be loaded in the"
echo "executable file.  You will not have to install a library file."
fi
else
# Test to see if the compiler will compile long strings...
echo "char libmath[] =" > JUNK.c
echo "#include \"math.h\"" >> JUNK.c
echo ";" >> JUNK.c
if $CC -c JUNK.c >/dev/null 2>&1
then
echo "The bc library will be loaded in the executable file.  You will"
echo "not have to install a library file."
else
echo "Your C compiler does not like long strings.  You will have to"
echo "load the math library from a file."
echo "#define BC_MATH_FILE \"$LIBFILE\"" >> config.h
fi
rm -f JUNK.c JUNK.o
fi
#
# exit
#
exit $EXIT