/*

 * serialno.c

 *

 * Copyright (c) Chris Putnam 2005-2018

 *

 * Source code released under the GPL version 2

 *

 */

#include <string.h>

#include "serialno.h"

int

addsn( fields *info, char *buf, int level )

{

	int ndigits, issn=0, isbn=0, isbn10=0, isbn13=0, status;

	char *p = buf, *tag;

	if ( !strncasecmp( p, "ISSN", 4 ) ) issn=1;

	else if ( !strncasecmp( p, "ISBN", 4 ) ) isbn=1;

	if ( isbn ) {

		ndigits = 0;

		while ( *p && !(ndigits && (*p==';'||*p==':')) ) {

			if ( ( *p>='0' && *p<='9' ) || *p=='x' || *p=='X' )

				ndigits++;

			p++;

		}

		if ( ndigits==13 ) isbn13 = 1;

		else /* ( ndigits==10) */ isbn10 = 1;

	}

	if ( !issn && !isbn ) {

		/* a lot have semicolons between multiple ISBN's for

		   paperbacks and hardbacks with different numbers */

		ndigits = 0;

		while ( *p && !(ndigits && (*p==';'||*p==':')) ) {

			if ( ( *p>='0' && *p<='9' ) || *p=='x' || *p=='X' )

				ndigits++;

			p++;

		}

		if ( ndigits==8 ) issn = 1;

		else if ( ndigits==10 ) isbn10 = 1;

		else if ( ndigits==13 ) isbn13 = 1;

	}

	if ( issn ) tag = "ISSN";

	else if ( isbn10 ) tag = "ISBN";

	else if ( isbn13 ) tag = "ISBN13";

	else tag = "SERIALNUMBER";

	status = fields_add( info, tag, buf, level );

	if ( status==FIELDS_OK ) return 1;

	else return 0;

}