4.3BSD - /usr/ingres/source/iutil/put_tuple.c

   1: # include   <ingres.h>
   2: # include   <symbol.h>
   3: # include   <access.h>
   4: # include   <catalog.h>
   5: # include   <sccs.h>
   6: 
   7: SCCSID(@(#)put_tuple.c	8.1	12/31/84)
   8: 
   9: 
  10: 
  11: char    *Acctuple;
  12: char    Accanon[MAXTUP];
  13: 
  14: 
  15: /*
  16: **  PUT_TUPLE
  17: **
  18: **	Put the canonical tuple in the position
  19: **	on the current page specified by tid
  20: **
  21: **	Trace Flags:
  22: **		27.3-5
  23: */
  24: 
  25: put_tuple(tid, tuple, length)
  26: TID *tid;
  27: char    *tuple;
  28: int length;
  29: {
  30:     register char   *tp;
  31:     char        *get_addr();
  32: 
  33: #	ifdef xATR2
  34:     if (tTf(27, 3))
  35:     {
  36:         printf("put_tuple:len=%d,", length);
  37:         dumptid(tid);
  38:     }
  39: #	endif
  40: 
  41:     /* get address in buffer */
  42:     tp = get_addr(tid);
  43: 
  44:     /* move the tuple */
  45:     bmove(tuple, tp, length);
  46: 
  47:     /* mark page as dirty */
  48:     Acc_head->bufstatus |= BUF_DIRTY;
  49: }
  50: /*
  51: **  CANONICAL
  52: **
  53: **	Make the tuple canonical and return the length
  54: **	of the tuple.
  55: **
  56: **	If the relation is compressed then the tuple in
  57: **	compressed into the global area Accanon.
  58: **
  59: **	As a side effect, the address of the tuple to be
  60: **	inserted is placed in Acctuple.
  61: **
  62: **	returns: length of canonical tuple
  63: **
  64: **	Trace Flags:
  65: **		27.6, 7
  66: */
  67: 
  68: canonical(d, tuple)
  69: register DESC   *d;
  70: register char   *tuple;
  71: {
  72:     register int    i;
  73: 
  74:     if (d->reldum.relspec < 0)
  75:     {
  76:         /* compress tuple */
  77:         i = comp_tup(d, tuple);
  78:         Acctuple = Accanon;
  79:     }
  80:     else
  81:     {
  82:         Acctuple = tuple;
  83:         /* ignore lid field */
  84:         i = d->reldum.relwid - 4 * d->reldum.reldim;
  85:     }
  86: #	ifdef xATR3
  87:     if (tTf(27, 6))
  88:         printf("canonical: %d\n", i);
  89: #	endif
  90:     return (i);
  91: }
  92: /*
  93: **  COMP_TUP
  94: **
  95: **	Compress the tuple into Accanon. Compression is
  96: **	done by copying INT and FLOAT as is.
  97: **	For CHAR fields, the tuple is copied until a null
  98: **	byte or until the end of the field. Then trailing
  99: **	blanks are removed and a null byte is inserted at
 100: **	the end if any trailing blanks were present.
 101: */
 102: 
 103: comp_tup(d, src)
 104: register DESC   *d;
 105: register char   *src;
 106: {
 107:     register char   *dst;
 108:     char        *save;
 109:     char        *domlen, *domtype;
 110:     int     i, j, len, numatts;
 111: 
 112:     dst = Accanon;
 113: 
 114:     domlen = &d->relfrml[1];
 115:     domtype = &d->relfrmt[1];
 116: 
 117:     /* ignore lid field */
 118:     numatts = d->reldum.relatts - d->reldum.reldim;
 119:     for (i = 1; i <= numatts; i++)
 120:     {
 121:         len = *domlen++ & I1MASK;
 122:         if (*domtype++ == CHAR)
 123:         {
 124:             save = src;
 125:             for (j = 1; j <= len; j++)
 126:             {
 127:                 if ((*dst++ = *src++) == NULL)
 128:                 {
 129:                     dst--;
 130:                     break;
 131:                 }
 132:             }
 133: 
 134:             while (j--)
 135:                 if (*--dst != ' ')
 136:                     break;
 137: 
 138:             if (j != len)
 139:                 *++dst = NULL;
 140: 
 141:             dst++;
 142:             src = save + len;
 143:         }
 144:         else
 145:         {
 146:             while (len--)
 147:                 *dst++ = *src++;
 148: 
 149:         }
 150:     }
 151:     return (dst - Accanon);
 152: }
 153: /*
 154: **  SPACE_LEFT
 155: **
 156: **	Determine how much space remains on the page in
 157: **	the current buffer. Included in computation
 158: **	is the room for an additional line number
 159: */
 160: 
 161: space_left(bp)
 162: register struct accbuf  *bp;
 163: {
 164:     register int    nextoff;
 165:     register int    i;
 166:     register short  *pp;
 167: 
 168:     nextoff = bp->nxtlino;
 169: #	ifdef xATR3
 170:     if (nextoff < 0 || nextoff > PGSIZE)
 171:         syserr("space_left: nextoff=%d", nextoff);
 172: #	endif
 173: 
 174:     /* compute space left on page */
 175:     pp = &bp->linetab[-nextoff];
 176:     i = PGSIZE - *pp - (nextoff + 2) * 2;
 177: 
 178:     /* see if there is also a free line number */
 179:     if (nextoff < MAXLINENO)
 180:         return (i);
 181:     while (++pp <= &bp->linetab[0])
 182:         if (*pp == 0)
 183:             return (i);
 184:     return (0);
 185: }

Defined functions

Defined variables