external/bsd/nvi/dist/common/util.h

   1 /*      $NetBSD: util.h,v 1.2 2013/11/22 15:52:05 christos Exp $ */
   2 /*-
   3  * Copyright (c) 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1994, 1995, 1996
   6  *      Keith Bostic.  All rights reserved.
   7  *
   8  * See the LICENSE file for redistribution information.
   9  *
  10  *      Id: util.h,v 10.5 1996/03/16 14:42:47 bostic Exp  (Berkeley) Date: 1996/03/16 14:42:47
  11  */
  12
  13 /* Macros to init/set/clear/test flags. */
  14 #define FL_INIT(l, f)   (l) = (f)               /* Specific flags location. */
  15 #define FL_SET(l, f)    ((l) |= (f))
  16 #define FL_CLR(l, f)    ((l) &= ~(f))
  17 #define FL_ISSET(l, f)  ((l) & (f))
  18
  19 #define LF_INIT(f)      FL_INIT(flags, f)       /* Local variable flags. */
  20 #define LF_SET(f)       FL_SET(flags, f)
  21 #define LF_CLR(f)       FL_CLR(flags, f)
  22 #define LF_ISSET(f)     FL_ISSET(flags, f)
  23
  24 #define F_INIT(p, f)    FL_INIT((p)->flags, f)  /* Structure element flags. */
  25 #define F_SET(p, f)     FL_SET((p)->flags, f)
  26 #define F_CLR(p, f)     FL_CLR((p)->flags, f)
  27 #define F_ISSET(p, f)   FL_ISSET((p)->flags, f)
  28
  29 /* Offset to next column of stop size, e.g. tab offsets. */
  30 #define COL_OFF(c, stop)        ((stop) - ((c) % (stop)))
  31
  32 /* Busy message types. */
  33 typedef enum { B_NONE, B_OFF, B_READ, B_RECOVER, B_SEARCH, B_WRITE } bmsg_t;
  34
  35 /*
  36  * Number handling defines and protoypes.
  37  *
  38  * NNFITS:      test for addition of two negative numbers under a limit
  39  * NPFITS:      test for addition of two positive numbers under a limit
  40  * NADD_SLONG:  test for addition of two signed longs
  41  * NADD_USLONG: test for addition of two unsigned longs
  42  */
  43 enum nresult { NUM_ERR, NUM_OK, NUM_OVER, NUM_UNDER };
  44 #define NNFITS(min, cur, add)                                           \
  45         (((long)(min)) - (cur) <= (add))
  46 #define NPFITS(max, cur, add)                                           \
  47         (((unsigned long)(max)) - (cur) >= (add))
  48 #define NADD_SLONG(sp, v1, v2)                                          \
  49         ((v1) < 0 ?                                                     \
  50             ((v2) < 0 &&                                                \
  51             NNFITS(LONG_MIN, (v1), (v2))) ? NUM_UNDER : NUM_OK :        \
  52          (v1) > 0 ?                                                     \
  53             (v2) > 0 &&                                                 \
  54             NPFITS(LONG_MAX, (unsigned long)(v1), (unsigned long)(v2)) ? \
  55               NUM_OK : NUM_OVER :                                       \
  56          NUM_OK)
  57 #define NADD_USLONG(sp, v1, v2)                                         \
  58         (NPFITS(ULONG_MAX, (v1), (v2)) ? NUM_OK : NUM_OVER)