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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

#include "config.h"

#include <limits.h>

#include "system.h"

#include "c_types.h"

#include "hashid_ops.h"

#include "error.h"

#include "catalog.h"

#include "option.h"

#include "char.h"

#include "file.h"

#include "inttype.h"

#include "lex.h"

#include "literal.h"

#include "macro.h"

#include "preproc.h"

#include "syntax.h"

#include "table.h"

#include "ustring.h"

/*

    PORTABILITY TABLE ENTRIES

    This table describes the portability table entries.  The entries need

    to be keep in one-to-one correspondence with the PORT_* macros defined

    in table.h.

*/

PORT_ENTRY port_entry [] = {

    { "char_bits", 0, 0, btype_none },			/* 0 */

    { "short_bits", 0, 0, btype_none },			/* 1 */

    { "int_bits", 0, 0, btype_none },			/* 2 */

    { "long_bits", 0, 0, btype_none },			/* 3 */

    { "longlong_bits", 1, 0, btype_none },		/* 4 */

    { "max_bits", 1, UINT_MAX, btype_none },		/* 5 */

    { "signed_range", 0, 0, btype_none },		/* 6 */

    { "char_type", 0, 0, btype_none },			/* 7 */

    { "exact_range", 1, 0, btype_none },		/* 8 */

    { "ptr_int", 1, 0, btype_none },			/* 9 */

    { "ptr_fn", 1, 0, btype_none },			/* 10 */

    { "non_prototype_checks", 1, 0, btype_none },	/* 11 */

    { "multibyte", 1, 0, btype_none }			/* 12 */

} ;

/*

    PARSE A PORTABILITY TABLE

    This routine parses and processes the portability table.  It returns

    the last token read.

*/

static int parse_table

    PROTO_Z ()

{

    int t ;

    PORT_ENTRY *p = port_entry ;

    while ( t = read_token (), t == lex_identifier ) {

	int i ;

	unsigned n = 0 ;

	HASHID nm = token_hashid ;

	BASE_TYPE bt = btype_none ;

	string us = DEREF_string ( hashid_name_etc_text ( nm ) ) ;

	update_column () ;

	/* Check through table entries */

	for ( i = 0 ; i < PORT_size ; i++ ) {

	    string ut = ustrlit ( p [i].name ) ;

	    if ( ustreq ( us, ut ) ) {

		/* Entry found */

		if ( p [i].set == 2 ) {

		    report ( crt_loc, ERR_port_entry_redef ( ut ) ) ;

		}

		p [i].set = 2 ;

		break ;

	    }

	}

	/* Perform appropriate action */

	switch ( i ) {

	    case PORT_char_bits :

	    case PORT_short_bits :

	    case PORT_int_bits :

	    case PORT_long_bits :

	    case PORT_llong_bits :

	    case PORT_max_bits :

	    case PORT_multibyte : {

		/* Deal with integral values */

		unsigned err = 0 ;

		t = read_token () ;

		update_column () ;

		if ( t != lex_integer_Hlit ) return ( t ) ;

		us = token_buff.start ;

		n = ( unsigned ) eval_line_digits ( us, &err ) ;

		if ( err ) report ( crt_loc, ERR_lex_literal_bad ( us ) ) ;

		break ;

	    }

	    case PORT_signed_range : {

		/* Deal with range values */

		t = read_token () ;

		update_column () ;

		if ( t != lex_identifier ) return ( t ) ;

		nm = token_hashid ;

		us = DEREF_string ( hashid_name_etc_text ( nm ) ) ;

		if ( ustrseq ( us, "maximum" ) ) {

		    bt = ( btype_signed | btype_long ) ;

		} else if ( ustrseq ( us, "symmetric" ) ) {

		    bt = btype_signed ;

		} else {

		    return ( t ) ;

		}

		break ;

	    }

	    case PORT_char_type : {

		/* Deal with sign values */

		t = read_token () ;

		update_column () ;

		if ( t != lex_identifier ) return ( t ) ;

		nm = token_hashid ;

		us = DEREF_string ( hashid_name_etc_text ( nm ) ) ;

		if ( ustrseq ( us, "signed" ) ) {

		    bt = btype_signed ;

		} else if ( ustrseq ( us, "unsigned" ) ) {

		    bt = btype_unsigned ;

		} else if ( ustrseq ( us, "either" ) ) {

		    bt = btype_none ;

		} else {

		    return ( t ) ;

		}

		break ;

	    }

	    case PORT_ptr_int : {

		/* Deal with type values */

		t = read_token () ;

		update_column () ;

		if ( t != lex_identifier ) return ( t ) ;

		nm = token_hashid ;

		us = DEREF_string ( hashid_name_etc_text ( nm ) ) ;

		if ( ustrseq ( us, "char" ) ) {

		    bt = btype_char ;

		} else if ( ustrseq ( us, "short" ) ) {

		    bt = btype_short ;

		} else if ( ustrseq ( us, "int" ) ) {

		    bt = btype_int ;

		} else if ( ustrseq ( us, "long" ) ) {

		    bt = btype_long ;

		} else if ( ustrseq ( us, "none" ) ) {

		    bt = btype_none ;

		} else {

		    return ( t ) ;

		}

		break ;

	    }

	    case PORT_exact_range :

	    case PORT_ptr_fn :

	    case PORT_non_proto : {

		/* Deal with boolean values */

		t = read_token () ;

		update_column () ;

		if ( t != lex_identifier ) return ( t ) ;

		nm = token_hashid ;

		us = DEREF_string ( hashid_name_etc_text ( nm ) ) ;

		if ( ustrseq ( us, "no" ) ) {

		    n = 0 ;

		} else if ( ustrseq ( us, "yes" ) ) {

		    n = 1 ;

		} else {

		    return ( t ) ;

		}

		break ;

	    }

	    default : {

		/* Unknown entry identifier */

		return ( t ) ;

	    }

	}

	p [i].value = n ;

	p [i].type = bt ;

    }

    return ( t ) ;

}

/*

    READ THE PORTABILITY TABLE

    This routine reads and processes the portability table given by nm.

*/

void read_table

    PROTO_N ( ( nm ) )

    PROTO_T ( string nm )

{

    int set = 0 ;

    PORT_ENTRY *p = port_entry ;

    /* Read table */

    if ( nm ) {

	int i, t ;

	input_name = nm ;

	if ( !open_input ( text_mode ) ) {

	    /* Can't open portability table */

	    fail ( ERR_fail_port ( nm ) ) ;

	} else {

	    /* Read portability table */

	    set = 1 ;

	    pragma_number = 1 ;

	    no_preproc_dir = 1 ;

	    crt_buff_no = 0 ;

	    IGNORE init_buffer ( crt_buff_no ) ;

	    unread_char ( char_newline ) ;

	    crt_loc.line-- ;

	    t = parse_table () ;

	    update_column () ;

	    if ( t != lex_eof ) {

		/* Parse error in portability table */

		PPTOKEN *r = new_pptok () ;

		r->tok = t ;

		token_parts ( t, r ) ;

		report ( crt_loc, ERR_lex_parse ( r ) ) ;

		set = 0 ;

	    } else {

		/* Check for undefined values */

		for ( i = 0 ; i < PORT_size ; i++ ) {

		    if ( p [i].set == 0 ) {

			string nt = ustrlit ( p [i].name ) ;

			report ( crt_loc, ERR_port_entry_undef ( nt ) ) ;

			set = 0 ;

		    }

		}

	    }

	    no_preproc_dir = 0 ;

	    pragma_number = 0 ;

	    close_input () ;

	}

    }

    /* Set values from table */

    if ( set ) {

	unsigned m ;

	unsigned long n ;

	BASE_INFO *q = basetype_info ;

	set_char_sign ( p [ PORT_char_type ].type ) ;

	if ( p [ PORT_llong_bits ].set == 2 ) {

	    /* 'long long' types are allowed */

	    set_option ( OPT_longlong, ( unsigned ) OPTION_ALLOW ) ;

	    m = p [ PORT_llong_bits ].value ;

	} else {

	    /* 'long long' types are not allowed */

	    m = p [ PORT_long_bits ].value ;

	    p [ PORT_llong_bits ].value = m ;

	}

	if ( p [ PORT_exact_range ].value == 0 ) {

	    /* Find maximum number of bits in an integer */

	    m = p [ PORT_max_bits ].value ;

	}

	for ( n = 0 ; n < ORDER_ntype ; n++ ) {

	    unsigned exact = p [ PORT_exact_range ].value ;

	    switch ( n ) {

		case ntype_char :

		case ntype_schar :

		case ntype_uchar : {

		    q [n].min_bits = p [ PORT_char_bits ].value ;

		    q [n].max_bits = m ;

		    break ;

		}

		case ntype_sshort :

		case ntype_ushort : {

		    q [n].min_bits = p [ PORT_short_bits ].value ;

		    q [n].max_bits = m ;

		    break ;

		}

		case ntype_sint :

		case ntype_uint :

		case ntype_none : {

		    q [n].min_bits = p [ PORT_int_bits ].value ;

		    q [n].max_bits = m ;

		    break ;

		}

		case ntype_slong :

		case ntype_ulong : {

		    q [n].min_bits = p [ PORT_long_bits ].value ;

		    q [n].max_bits = m ;

		    break ;

		}

		case ntype_sllong :

		case ntype_ullong : {

		    q [n].min_bits = p [ PORT_llong_bits ].value ;

		    q [n].max_bits = m ;

		    break ;

		}

		case ntype_ptrdiff_t :

		case ntype_size_t : {

		    q [n].min_bits = p [ PORT_int_bits ].value ;

		    q [n].max_bits = m ;

		    exact = 0 ;

		    break ;

		}

		case ntype_wchar_t :

		case ntype_ellipsis : {

		    q [n].min_bits = p [ PORT_char_bits ].value ;

		    q [n].max_bits = m ;

		    exact = 0 ;

		    break ;

		}

	    }

	    if ( exact ) {

		/* Exact integer range known */

		q [n].max_bits = q [n].min_bits ;

	    }

	    if ( q [n].sign & btype_signed ) {

		/* Set signed type range */

		q [n].sign = p [ PORT_signed_range ].type ;

	    }

	}

	if ( p [ PORT_exact_range ].value ) {

	    /* Set exact type ranges */

	    set_exact_types () ;

	}

    }

    return ;

}