2.9BSD/usr/contrib/notes/next.c

static char *sccsid = "@(#)next.c	1.1\t1/23/83";

/*
 *	next.c -	find the next note/response after a certain time
 *
 *	nxtnote(io, note,date)
 *		finds the next note with number > note which has been 
 *	modified after date. If none exists, a -1 is returned, otherwise
 *	the note number is returned.
 *
 *	nxtresp(io,note,resp,date)
 *		same idea as above, except, we look through the responses 
 *	after resp to note # note. If there is no response, we return 
 *	a -1, else we return the response number.
 *
 *	inorder(date1, date2) struct when_f *date1, *date2)
 *		return 1 if date1 before date2, otherwise return 0.
 *
 *	Original coding:	Ray Essick	november 1981
 */

#include "parms.h"
#include "structs.h"

nxtnote(io, note, date)
struct io_f *io;
struct when_f  *date;
{
	struct note_f   znote;

	if (note < 0)
		note = 0;			/* start at beginning */
	note++;				/* find starts with next note ! */
	while (note <= io->descr.d_nnote) {
		getnrec(io, note, &znote);	/* get note header */
		if (znote.n_stat & DELETED) {
			note++;			/* go on to the next note */
			continue;		/* try the next note */
		}
		if (inorder(&znote.n_lmod, date) == 0)	{
			/* want equals to show */
			return(note);		/* modified after date */
		}
		note++;				/* go try the next note */
	}
	return(-1);				/* wasn't a more recent note */
}

nxtresp(io, note, resp, date)
struct io_f *io;
struct when_f *date;
{
	struct note_f znote;
	struct resp_f rrec;
	int poffset, recnum;

	getnrec(io, note, &znote);
	if (resp < 0)
		resp = 0;		/* can't look at negative response */
	resp++;				/* start search at next response */
	while (resp <= znote.n_nresp) {
		if (lrsp(io, note, resp, &rrec, &poffset, &recnum) == -1)
			break;		/* no response, drop out */
		if (inorder(&rrec.r_rcvd[poffset], date) == 0)
			return(resp);	/* return if date earlier or same */
		resp++;
	}
	return(-1);			/* no later responses to this note */
}

inorder(d1, d2)
struct when_f *d1, *d2;
{
	if (d1->w_year < d2->w_year)
		return(1);
	if (d1->w_year > d2->w_year)
		return(0);

	if (d1->w_month < d2->w_month)
		return(1);
	if (d1->w_month > d2->w_month)
		return(0);

	if (d1->w_day < d2->w_day)
		return(1);
	if (d1->w_day > d2->w_day)
		return(0);

	if (d1->w_hours < d2->w_hours)
		return(1);
	if (d1->w_hours > d2->w_hours)
		return(0);

	if (d1->w_mins < d2->w_mins)
		return(1);
	if (d1->w_mins > d2->w_mins)
		return(0);

	return(0);		/* equal dates are not in order */
}