########################################################################
#                                                                      #
#               This software is part of the ast package               #
#          Copyright (c) 1982-2010 AT&T Intellectual Property          #
#                      and is licensed under the                       #
#                  Common Public License, Version 1.0                  #
#                    by AT&T Intellectual Property                     #
#                                                                      #
#                A copy of the License is available at                 #
#            http://www.opensource.org/licenses/cpl1.0.txt             #
#         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         #
#                                                                      #
#              Information and Software Systems Research               #
#                            AT&T Research                             #
#                           Florham Park NJ                            #
#                                                                      #
#                  David Korn <dgk@research.att.com>                   #
#                                                                      #
########################################################################
: generate the ksh math builtin table
: include math.tab

# @(#)math.sh (AT&T Research) 2009-08-18

command=$0
iffeflags="-n -v"
iffehdrs="math.h ieeefp.h"
iffelibs="-lm"
table=/dev/null

eval $1
shift
table=$1

names=
tests=

: check long double

eval `iffe $iffeflags -c "$cc" - typ long.double 2>&$stderr`

: check ast_standards.h

eval `iffe $iffeflags -F ast_standards.h -c "$cc" - tst use_ast_standards -lm 'note{' 'math.h needs ast_standards.h' '}end' 'link{' '#include <math.h>' '#ifndef isgreater' '#define isgreater(a,b) 0' '#endif' 'int main() { return isgreater(0.0,1.0); }' '}end'`
case $_use_ast_standards in
1)	iffeflags="$iffeflags -F ast_standards.h" ;;
esac

: read the table

exec < $table
while	read type args name aka comment
do	case $type in
	[fi])	names="$names $name"
		tests="$tests,$name"
		case $_typ_long_double in
		1)	tests="$tests,${name}l" ;;
		esac
		eval TYPE_$name=$type ARGS_$name=$args AKA_$name=$aka
		;;
	esac
done

: check the math library

eval `iffe $iffeflags -c "$cc" - lib $tests $iffehdrs $iffelibs 2>&$stderr`
lib=
for name in $names
do	eval x='$'_lib_${name}l y='$'_lib_${name}
	case $x in
	1)	lib="$lib,${name}l" ;;
	esac
	case $y in
	1)	case $x in
		'')	lib="$lib,${name}" ;;
		esac
		;;
	esac
done
eval `iffe $iffeflags -c "$cc" - dat,npt,mac $lib $iffehdrs $iffelibs 2>&$stderr`

cat <<!
#pragma prototyped

/* : : generated by $command from $table : : */

typedef Sfdouble_t (*Math_f)(Sfdouble_t,...);

!
case $_use_ast_standards in
1)	echo "#include <ast_standards.h>" ;;
esac
echo "#include <math.h>"
case $_hdr_ieeefp in
1)	echo "#include <ieeefp.h>" ;;
esac
echo

: generate the intercept functions and table entries

nl='
'
ht='	'
tab=
for name in $names
do	eval x='$'_lib_${name}l y='$'_lib_${name} r='$'TYPE_${name} a='$'ARGS_${name} aka='$'AKA_${name}
	case $x:$y in
	1:*)	f=${name}l
		t=Sfdouble_t
		local=
		;;
	*:1)	f=${name}
		t=double
		local=$_typ_long_double
		;;
	*)	case $aka in
		*=*)	f=${aka%%=*}
			v=${aka#*=}
			eval x='$'_lib_${f}l y='$'_lib_${f}
			case $x:$y in
			1:*)	f=${f}l
				;;
			*:1)	;;
			*)	continue
				;;
			esac
			L=local_$name r=int R=1
			echo "#ifdef $v${nl}static $r $L(Sfdouble_t x) { return $f(x) == $v; }${nl}#endif"
			tab="$tab$nl#ifdef $v$nl$ht\"\\0${R}${a}${name}\",$ht(Math_f)${L},${nl}#endif"
			;;
		esac
		continue
		;;
	esac
	eval n='$'_npt_$f m='$'_mac_$f d='$'_dat_$f
	case $r in
	i)	L=int r=int R=1 ;;
	*)	L=Sfdouble_t r=$t R=0 ;;
	esac
	case $d:$m:$n in
	1:*:*|*:1:*)
		;;
	*:*:1)	code="extern $r $f("
		sep=
		for p in 1 2 3 4 5 6 7
		do	code="$code${sep}$t"
			case $a in
			$p)	break ;;
			esac
			sep=","
		done
		code="$code);"
		echo "$code"
		;;
	esac
	case $local:$m:$n:$d in
	1:*:*:*|*:1:*:*|*:*:1:)
		args=
		code="static $L local_$f("
		sep=
		for p in 1 2 3 4 5 6 7 8 9
		do	args="$args${sep}a$p"
			code="$code${sep}Sfdouble_t a$p"
			case $a in
			$p)	break ;;
			esac
			sep=","
		done
		code="$code){return $f($args);}"
		echo "$code"
		f=local_$f
		;;
	esac
	for x in $name $aka
	do	tab="$tab$nl$ht\"\\0${R}${a}${x}\",$ht(Math_f)$f,"
	done
done
tab="$tab$nl$ht\"\",$ht$ht(Math_f)0"

cat <<!

/*
 * first byte is two-digit octal number.  Last digit is number of args
 * first digit is 0 if return value is double, 1 for integer
 */
const struct mathtab shtab_math[] =
{$tab
};
!