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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"

#if FS_STDARG

#include <stdarg.h>

#else

#include <varargs.h>

#endif

#include "types.h"

#include "file.h"

#include "pretty.h"

#include "utility.h"

/*

    PROGRAM NAME

    The program name is output in all error reports.

*/

char *progname = "disp" ;

/*

    EXIT STATUS

    This flag is set to 1 whenever an error occurs.  It is the value

    with which the program finally exits.

*/

int exit_status = EXIT_SUCCESS ;

/*

    RECOVERY FLAG

    This flag controls whether an attempt is made to recover from

    non-fatal errors.  Anything after an error is likely to be of very

    little use.

*/

int recover = 0 ;

/*

    REPORT A FATAL ERROR

    An error is reported and the program aborts immediately.

*/

void fatal_error

    PROTO_V ( ( char *s, ... ) ) /* VARARGS */

{

    va_list args ;

#if FS_STDARG

    va_start ( args, s ) ;

#else

    char *s ;

    va_start ( args ) ;

    s = va_arg ( args, char * ) ;

#endif

    if ( progname ) IGNORE fprintf ( stderr, "%s: ", progname ) ;

    IGNORE fprintf ( stderr, "Error: " ) ;

    IGNORE vfprintf ( stderr, s, args ) ;

    IGNORE fprintf ( stderr, ".\n" ) ;

    va_end ( args ) ;

    exit ( EXIT_FAILURE ) ;

}

/*

    REPORT AN INPUT ERROR

    An error is reported together with the position within the input

    file where it occured, and the program either attempts to recover

    (if the recover flag is true) or outputs what it has read so far

    and then exits (otherwise).

*/

void input_error

    PROTO_V ( ( char *s, ... ) ) /* VARARGS */

{

    va_list args ;

    long b = here.byte ;

#if FS_STDARG

    va_start ( args, s ) ;

#else

    char *s ;

    va_start ( args ) ;

    s = va_arg ( args, char * ) ;

#endif

    if ( progname ) IGNORE fprintf ( stderr, "%s: ", progname ) ;

    IGNORE fprintf ( stderr, "Error: " ) ;

    IGNORE vfprintf ( stderr, s, args ) ;

    IGNORE fprintf ( stderr, ", byte %ld, bit %d.\n", b, here.bit ) ;

    va_end ( args ) ;

    exit_status = EXIT_FAILURE ;

    if ( !recover ) {

	pretty_tree () ;

	exit ( EXIT_FAILURE ) ;

    }

    return ;

}

/*

    ALLOCATE A SECTION OF MEMORY

    This routine allocates n bytes of memory.

*/

pointer xalloc

    PROTO_N ( ( n ) )

    PROTO_T ( int n )

{

    pointer ptr = ( pointer ) malloc ( ( size_t ) n ) ;

    if ( ptr == null ) fatal_error ( "Memory allocation error" ) ;

    return ( ptr ) ;

}

/*

    REALLOCATE A SECTION OF MEMORY

    This routine reallocates n bytes of memory.

*/

pointer xrealloc

    PROTO_N ( ( p, n ) )

    PROTO_T ( pointer p X int n )

{

    pointer ptr ;

    if ( p == null ) return ( xalloc ( n ) ) ;

    ptr = ( pointer ) realloc ( p, ( size_t ) n ) ;

    if ( ptr == null ) fatal_error ( "Memory allocation error" ) ;

    return ( ptr ) ;

}