| 1 | /*- |
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| 2 | * Copyright (c) 1994 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * Copyright (c) 1994, 1995, 1996 |
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| 5 | * Keith Bostic. All rights reserved. |
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| 6 | * |
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| 7 | * See the LICENSE file for redistribution information. |
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| 8 | * |
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| 9 | * @(#)util.h 10.5 (Berkeley) 3/16/96 |
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| 10 | */ |
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| 11 | |
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| 12 | /* Macros to init/set/clear/test flags. */ |
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| 13 | #define FL_INIT(l, f) (l) = (f) /* Specific flags location. */ |
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| 14 | #define FL_SET(l, f) ((l) |= (f)) |
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| 15 | #define FL_CLR(l, f) ((l) &= ~(f)) |
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| 16 | #define FL_ISSET(l, f) ((l) & (f)) |
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| 17 | |
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| 18 | #define LF_INIT(f) FL_INIT(flags, f) /* Local variable flags. */ |
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| 19 | #define LF_SET(f) FL_SET(flags, f) |
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| 20 | #define LF_CLR(f) FL_CLR(flags, f) |
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| 21 | #define LF_ISSET(f) FL_ISSET(flags, f) |
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| 22 | |
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| 23 | #define F_INIT(p, f) FL_INIT((p)->flags, f) /* Structure element flags. */ |
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| 24 | #define F_SET(p, f) FL_SET((p)->flags, f) |
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| 25 | #define F_CLR(p, f) FL_CLR((p)->flags, f) |
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| 26 | #define F_ISSET(p, f) FL_ISSET((p)->flags, f) |
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| 27 | |
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| 28 | /* Offset to next column of stop size, e.g. tab offsets. */ |
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| 29 | #define COL_OFF(c, stop) ((stop) - ((c) % (stop))) |
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| 30 | |
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| 31 | /* Busy message types. */ |
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| 32 | typedef enum { B_NONE, B_OFF, B_READ, B_RECOVER, B_SEARCH, B_WRITE } bmsg_t; |
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| 33 | |
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| 34 | /* |
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| 35 | * Number handling defines and protoypes. |
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| 36 | * |
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| 37 | * NNFITS: test for addition of two negative numbers under a limit |
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| 38 | * NPFITS: test for addition of two positive numbers under a limit |
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| 39 | * NADD_SLONG: test for addition of two signed longs |
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| 40 | * NADD_USLONG: test for addition of two unsigned longs |
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| 41 | */ |
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| 42 | enum nresult { NUM_ERR, NUM_OK, NUM_OVER, NUM_UNDER }; |
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| 43 | #define NNFITS(min, cur, add) \ |
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| 44 | (((long)(min)) - (cur) <= (add)) |
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| 45 | #define NPFITS(max, cur, add) \ |
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| 46 | (((unsigned long)(max)) - (cur) >= (add)) |
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| 47 | #define NADD_SLONG(sp, v1, v2) \ |
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| 48 | ((v1) < 0 ? \ |
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| 49 | ((v2) < 0 && \ |
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| 50 | NNFITS(LONG_MIN, (v1), (v2))) ? NUM_UNDER : NUM_OK : \ |
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| 51 | (v1) > 0 ? \ |
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| 52 | (v2) > 0 && \ |
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| 53 | NPFITS(LONG_MAX, (v1), (v2)) ? NUM_OK : NUM_OVER : \ |
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| 54 | NUM_OK) |
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| 55 | #define NADD_USLONG(sp, v1, v2) \ |
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| 56 | (NPFITS(ULONG_MAX, (v1), (v2)) ? NUM_OK : NUM_OVER) |
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