diplodocus.org Git - nmh/blob - docs/historical/mh-6.8.5/sbr/m_remsg.c

   1 /* m_remsg.c - realloc a msgs structure */
   2 #ifndef lint
   3 static char ident[] = "@(#)$Id: m_remsg.c,v 1.8 1992/12/15 00:20:22 jromine Exp $";
   4 #endif  /* lint */
   5
   6 #include "../h/mh.h"
   7 #include <stdio.h>
   8
   9
  10 struct msgs *m_remsg (mp, lo, hi)
  11 register struct msgs *mp;
  12 int     lo,
  13         hi;
  14 {
  15     int     msgnum;
  16 #ifdef  MTR
  17     register int   *sp,
  18                    *pp;
  19 #endif  /* MTR */
  20
  21     if (lo == 0 && (lo = mp -> lowmsg) == 0)
  22         lo = 1;
  23     if (hi < mp -> hghmsg)
  24         hi = mp -> hghmsg + (MAXFOLDER - mp -> nummsg);
  25     if (hi <= mp -> hghmsg)
  26         hi = mp -> hghmsg + MAXFOLDER;
  27     if (lo == mp -> lowmsg && hi == mp -> hghmsg)
  28         return mp;
  29
  30 #ifndef MTR
  31     mp = (struct msgs  *) realloc ((char *) mp, MHSIZE (mp, lo, hi));
  32     if (mp == NULL)
  33         adios (NULLCP, "unable to re-allocate folder storage");
  34 #else   /* MTR */
  35     if ((sp = (int *) calloc ((unsigned) 1, MHSIZEX (mp, lo, hi))) == NULL)
  36         adios (NULLCP, "unable to re-allocate messages storage");
  37
  38     pp = sp - lo;
  39     if (pp < (int *)0)
  40         adios (NULLCP, "m_remsg() botch -- you lose big[1]");
  41     for (msgnum = mp -> lowmsg; msgnum <= mp -> hghmsg; msgnum++)
  42         pp[msgnum] = mp -> msgstats[msgnum];
  43     free ((char *) mp -> msgbase);
  44     mp -> msgstats = sp;
  45 #endif  /* MTR */
  46     mp -> lowoff = lo;
  47     mp -> hghoff = hi;
  48 #ifdef  MTR
  49     mp -> msgstats = (mp -> msgbase = mp -> msgstats) - mp -> lowoff;
  50     if (mp -> msgstats < (int *)0)
  51         adios (NULLCP, "m_remsg() botch -- you lose big[2]");
  52 #endif  /* MTR */
  53     for (msgnum = mp -> lowmsg - 1; msgnum >= lo; msgnum--)
  54         mp -> msgstats[msgnum] = 0;
  55     for (msgnum = mp -> hghmsg + 1; msgnum <= hi; msgnum++)
  56         mp -> msgstats[msgnum] = 0;
  57
  58     return mp;
  59 }