4.3BSD - /usr/ingres/source/ctlmod/range.c

   1: # include   <ingres.h>
   2: # include   <symbol.h>
   3: # include   <range.h>
   4: # include   <tree.h>
   5: # include   <sccs.h>
   6: # include   <errors.h>
   7: 
   8: SCCSID(@(#)range.c	8.2	2/8/85)
   9: 
  10: 
  11: 
  12: /*
  13: **  CLRRANGE -- clear range table(s)
  14: **
  15: **	Parameters:
  16: **		none.
  17: **
  18: **	Returns:
  19: **		none.
  20: **
  21: **	Side Effects:
  22: **		The range table (Qt.qt_rangev) is cleared.
  23: */
  24: 
  25: clrrange()
  26: {
  27:     register int    i;
  28:     register DESC   *d;
  29: 
  30:     for (i = 0; i < MAXRANGE; i++)
  31:     {
  32:         Qt.qt_rangev[i].rngvmark = FALSE;
  33:         Qt.qt_remap[i] = i;
  34:         d = Qt.qt_rangev[i].rngvdesc;
  35:         if (d != NULL)
  36:         {
  37:             xfree(d);
  38:             Qt.qt_rangev[i].rngvdesc = NULL;
  39:         }
  40:     }
  41: }
  42: /*
  43: **  DECLARE -- declare a range variable
  44: **
  45: **	A range variable is declared.  If possible, the preferred varno
  46: **	stated is used (this is the one already in the tree).  This
  47: **	should always be possible when reading the original tree (and
  48: **	should probably stay this way to make debugging easier).  When
  49: **	not possible, a new varno is chosen and the tree can later
  50: **	be patched up by 'mapvars'.
  51: **
  52: **	Parameters:
  53: **		varno -- the preferred varno.
  54: **		desc -- the descriptor for this range variable.
  55: **
  56: **	Returns:
  57: **		The actual varno assigned.
  58: **
  59: **	Side Effects:
  60: **		Qt.qt_rangev is updated.
  61: **
  62: **	Trace Flags:
  63: **		7.0-3
  64: */
  65: 
  66: declare(varno, desc)
  67: int varno;
  68: DESC    *desc;
  69: {
  70:     register int    i;
  71:     register int    vn;
  72:     extern char *trim_relname();
  73: 
  74:     vn = varno;
  75: 
  76:     /* check for preferred slot in range table available */
  77:     if (desc != NULL && Qt.qt_rangev[vn].rngvdesc != NULL)
  78:     {
  79:         /* try to find another slot */
  80:         for (i = 0; i < MAXRANGE; i++)
  81:             if (Qt.qt_rangev[i].rngvdesc == NULL)
  82:                 break;
  83: 
  84:         if (i >= MAXRANGE)
  85:         {
  86:             /* too many variables */
  87:             error(TOOMANYVARS, trim_relname(desc->reldum.relid), 0);
  88:         }
  89: 
  90:         vn = i;
  91:     }
  92: 
  93:     /* if clearing, make sure something to clear */
  94:     if (desc == NULL && Qt.qt_rangev[vn].rngvdesc == NULL)
  95:         syserr("declare: null clr %d", vn);
  96: 
  97:     /* declare variable in the slot */
  98:     Qt.qt_rangev[vn].rngvdesc = desc;
  99:     Qt.qt_rangev[vn].rngvmark = (desc != NULL);
 100: 
 101: #	ifdef xQTR2
 102:     if (tTf(7, 0))
 103:         lprintf("declare(%d, %.14s) into slot %d\n", varno,
 104:             desc != NULL ? desc->reldum.relid : "(NULL)", vn);
 105: #	endif
 106: 
 107:     return (vn);
 108: }

Defined functions