/*
 * Copyright (c) 2007 The Akuma Project
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * $Id: error.c 130 2007-05-29 12:54:04Z asmodai $
 */
/*
    		 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 <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "error.h"


/*
    ERROR FLAGS AND VARIABLES

    These variables are used or set in the error routines.
*/

const char *progname = NULL;
const char *progvers = NULL;
int exit_status = EXIT_SUCCESS;
int maximum_errors = 20;
static int number_errors = 0;

int crt_line_no = 1;
const char *crt_file_name = NULL;


/*
    SET PROGRAM NAME

    This routine sets the program name to nm and the program version to
    vers.
*/

void
set_progname(const char *nm, const char *vers)
{
	char *r = strrchr(nm, '/');
	progname = (r ? r + 1 : nm);
	progvers = vers;
	return;
}


/*
    PRINT VERSION NUMBER

    This routine prints the program name and version number.
*/

void
report_version(void)
{
	const char *nm = progname;
	const char *vers = progvers;
	if (nm == NULL) {
		nm = "unknown";
	}
	if (vers == NULL) {
		vers = "1.0";
	}
	fprintf(stderr, "%s: Version %s\n", nm, vers);
	return;
}


/*
    PRINT AN ERROR MESSAGE

    This routine prints an error message s with arguments args and severity
    e.  fn and ln give the error position.
*/

static void
error_msg(int e, const char *fn, int ln, const char *s, va_list args)
{
	if (e != ERROR_NONE) {
		if (progname) {
			fprintf(stderr, "%s: ", progname);
		}
		switch (e) {
		case ERROR_WARNING: {
			fprintf(stderr, "Warning: ");
			break;
		}
		case ERROR_FATAL: {
			fprintf(stderr, "Fatal: ");
			exit_status = EXIT_FAILURE;
			number_errors++;
			break;
		}
		default : {
			fprintf(stderr, "Error: ");
			exit_status = EXIT_FAILURE;
			number_errors++;
			break;
		}
		}
		if (fn) {
			fprintf(stderr, "%s: ", fn);
			if (ln != -1) {
				fprintf(stderr, "line %d: ", ln);
			}
		}
		vfprintf(stderr, s, args);
		fprintf(stderr, ".\n");
		if (e == ERROR_FATAL) {
			exit(EXIT_FAILURE);
		}
		if (number_errors >= maximum_errors && maximum_errors) {
			error(ERROR_FATAL, "Too many errors (%d) - aborting",
			      number_errors);
		}
	}
	return;
}


/*
    PRINT AN ERROR AT CURRENT POSITION

    This routine prints the error message s of severity e at the current
    file position.  s is a printf format string whose arguments are passed
    as the optional procedure parameters.
*/

void
error(int e, const char *s, ...)
    /*VARARGS*/
{
	va_list args;
	va_start(args, s);
	error_msg(e, crt_file_name, crt_line_no, s, args);
	va_end(args);
	return;
}


/*
    PRINT AN ERROR AT A GIVEN POSITION

    This routine prints the error message s of severity e at the file
    position given by fn and ln.  s is as above.
*/

void
error_posn(int e, const char *fn, int ln, const char *s, ...)
    /*VARARGS*/
{
	va_list args;

	va_start(args, s);
	error_msg(e, fn, ln, s, args);
	va_end(args);
	return;
}


#ifdef DEBUG

/*
    PRINT AN ASSERTION

    This routine prints the assertion s which occurred at the location
    given by file and line.
*/

void
assertion(const char *s, const char *file, int line)
{
	if (progname) {
		fprintf(stderr, "%s: ", progname);
	}
	fprintf(stderr, "Assertion: %s: line %d: '%s'.\n", file, line, s);
	abort();
}

#endif