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/* $OpenBSD: util.h,v 1.2 2001/01/29 01:58:32 niklas Exp $ */
/*-
* Copyright (c) 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*
* @(#)util.h 10.5 (Berkeley) 3/16/96
*/
/* Macros to init/set/clear/test flags. */
#define FL_INIT(l, f) (l) = (f) /* Specific flags location. */
#define FL_SET(l, f) ((l) |= (f))
#define FL_CLR(l, f) ((l) &= ~(f))
#define FL_ISSET(l, f) ((l) & (f))
#define LF_INIT(f) FL_INIT(flags, f) /* Local variable flags. */
#define LF_SET(f) FL_SET(flags, f)
#define LF_CLR(f) FL_CLR(flags, f)
#define LF_ISSET(f) FL_ISSET(flags, f)
#define F_INIT(p, f) FL_INIT((p)->flags, f) /* Structure element flags. */
#define F_SET(p, f) FL_SET((p)->flags, f)
#define F_CLR(p, f) FL_CLR((p)->flags, f)
#define F_ISSET(p, f) FL_ISSET((p)->flags, f)
/* Offset to next column of stop size, e.g. tab offsets. */
#define COL_OFF(c, stop) ((stop) - ((c) % (stop)))
/* Busy message types. */
typedef enum { B_NONE, B_OFF, B_READ, B_RECOVER, B_SEARCH, B_WRITE } bmsg_t;
/*
* Number handling defines and protoypes.
*
* NNFITS: test for addition of two negative numbers under a limit
* NPFITS: test for addition of two positive numbers under a limit
* NADD_SLONG: test for addition of two signed longs
* NADD_USLONG: test for addition of two unsigned longs
*/
enum nresult { NUM_ERR, NUM_OK, NUM_OVER, NUM_UNDER };
#define NNFITS(min, cur, add) \
(((long)(min)) - (cur) <= (add))
#define NPFITS(max, cur, add) \
(((unsigned long)(max)) - (cur) >= (add))
#define NADD_SLONG(sp, v1, v2) \
((v1) < 0 ? \
((v2) < 0 && \
NNFITS(LONG_MIN, (v1), (v2))) ? NUM_UNDER : NUM_OK : \
(v1) > 0 ? \
(v2) > 0 && \
NPFITS(LONG_MAX, (v1), (v2)) ? NUM_OK : NUM_OVER : \
NUM_OK)
#define NADD_USLONG(sp, v1, v2) \
(NPFITS(ULONG_MAX, (v1), (v2)) ? NUM_OK : NUM_OVER)
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