2.11BSD#431 - /usr/ingres/source/parser/getscr.c

   1: # include   "../ingres.h"
   2: # include   "../pipes.h"
   3: 
   4: /*
   5: ** GETSCR
   6: **	returns a single character from the R_up pipe.
   7: **	modes are:
   8: **		0 = read normally
   9: **		1 = prime the pipe
  10: **		2 = sync (or flush) the pipe
  11: */
  12: getscr(mode)
  13: int mode;
  14: {
  15:     extern int      Pctr;       /* vble for backup stack in scanner */
  16:     static struct pipfrmt   a;
  17:     register int        ctr;
  18:     char            c;
  19: #	ifdef xPTM
  20:     static int      Ptimflg;    /* marks the first time through */
  21: #	endif
  22: 
  23:     if (!mode)
  24:     {
  25:         ctr = rdpipe(P_NORM, &a, R_up, &c, 1);
  26: #		ifdef xPTM
  27:         if (Ptimflg == 0 && tTf(76, 1))
  28:         {
  29:             timtrace(1, 0);
  30:             Ptimflg = 1;
  31:         }
  32:         if (tTf(76, 3))
  33:             qtrace(ctr ? c : '\0');
  34: #		endif
  35:         return (ctr ? c : 0);
  36:     }
  37:     if (mode == 1)
  38:     {
  39:         rdpipe(P_PRIME, &a);
  40:         Pctr = 0;
  41:         return (0);
  42:     }
  43:     if (mode == 2)
  44:     {
  45: #		ifdef xPTM
  46:         if (tTf(76, 1))
  47:         {
  48:             timtrace(2, 0);
  49:             Ptimflg = 0;
  50:         }
  51: #		endif
  52:         rdpipe(P_SYNC, &a, R_up);
  53:         return (0);
  54:     }
  55:     syserr("bad arg '%d' in getscr", mode);
  56: }

Defined functions