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/*
* seq_list.c -- Get all messages in a sequence and return them
* -- as a space separated list of message ranges.
*
* This code is Copyright (c) 2002, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include <h/mh.h>
#include <h/utils.h>
/* allocate this much buffer space at a time */
#define MAXBUFFER 1024
/* static buffer to collect the sequence line */
static char *buffer = NULL;
static int len = 0;
char *
seq_list(struct msgs *mp, char *seqname)
{
int i, j, seqnum;
char *bp;
/* On first invocation, allocate initial buffer space */
if (!buffer) {
len = MAXBUFFER;
buffer = mh_xmalloc ((size_t) len);
}
/*
* Special processing for "cur" sequence. We assume that the
* "cur" sequence and mp->curmsg are in sync (see seq_add.c).
* This is returned, even if message doesn't exist or the
* folder is empty.
*/
if (!strcmp (current, seqname)) {
if (mp->curmsg) {
sprintf(buffer, "%s", m_name(mp->curmsg));
return (buffer);
} else
return (NULL);
}
/* If the folder is empty, just return NULL */
if (mp->nummsg == 0)
return NULL;
/* Get the index of the sequence */
if ((seqnum = seq_getnum (mp, seqname)) == -1)
return NULL;
bp = buffer;
for (i = mp->lowmsg; i <= mp->hghmsg; ++i) {
/*
* If message doesn't exist, or isn't in
* the sequence, then continue.
*/
if (!does_exist(mp, i) || !in_sequence(mp, seqnum, i))
continue;
/*
* See if we need to enlarge buffer. Since we don't know
* exactly how many character this particular message range
* will need, we enlarge the buffer if we are within
* 50 characters of the end.
*/
if (bp - buffer > len - 50) {
char *newbuf;
len += MAXBUFFER;
newbuf = mh_xrealloc (buffer, (size_t) len);
bp = newbuf + (bp - buffer);
buffer = newbuf;
}
/*
* If this is not the first message range in
* the list, first add a space.
*/
if (bp > buffer)
*bp++ = ' ';
sprintf(bp, "%s", m_name(i));
bp += strlen(bp);
j = i; /* Remember beginning of message range */
/*
* Scan to the end of this message range
*/
for (++i; i <= mp->hghmsg && does_exist(mp, i) && in_sequence(mp, seqnum, i);
++i)
;
if (i - j > 1) {
sprintf(bp, "-%s", m_name(i - 1));
bp += strlen(bp);
}
}
return (bp > buffer? buffer : NULL);
}
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