1 /*- 2 * Copyright (c) 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1994, 1995, 1996 5 * Keith Bostic. All rights reserved. 6 * 7 * See the LICENSE file for redistribution information. 8 */ 9 10 /* Macros to init/set/clear/test flags. */ 11 #define FL_INIT(l, f) (l) = (f) /* Specific flags location. */ 12 #define FL_SET(l, f) ((l) |= (f)) 13 #define FL_CLR(l, f) ((l) &= ~(f)) 14 #define FL_ISSET(l, f) ((l) & (f)) 15 16 #define LF_INIT(f) FL_INIT(flags, f) /* Local variable flags. */ 17 #define LF_SET(f) FL_SET(flags, f) 18 #define LF_CLR(f) FL_CLR(flags, f) 19 #define LF_ISSET(f) FL_ISSET(flags, f) 20 21 #define F_INIT(p, f) FL_INIT((p)->flags, f) /* Structure element flags. */ 22 #define F_SET(p, f) FL_SET((p)->flags, f) 23 #define F_CLR(p, f) FL_CLR((p)->flags, f) 24 #define F_ISSET(p, f) FL_ISSET((p)->flags, f) 25 26 /* Offset to next column of stop size, e.g. tab offsets. */ 27 #define COL_OFF(c, stop) ((stop) - ((c) % (stop))) 28 29 /* Busy message types. */ 30 typedef enum { B_NONE, B_OFF, B_READ, B_RECOVER, B_SEARCH, B_WRITE } bmsg_t; 31 32 /* 33 * Number handling defines and protoypes. 34 * 35 * NNFITS: test for addition of two negative numbers under a limit 36 * NPFITS: test for addition of two positive numbers under a limit 37 * NADD_SLONG: test for addition of two signed longs 38 * NADD_USLONG: test for addition of two unsigned longs 39 */ 40 enum nresult { NUM_ERR, NUM_OK, NUM_OVER, NUM_UNDER }; 41 #define NNFITS(min, cur, add) \ 42 (((long)(min)) - (cur) <= (add)) 43 #define NPFITS(max, cur, add) \ 44 (((unsigned long)(max)) - (cur) >= (add)) 45 #define NADD_SLONG(sp, v1, v2) \ 46 ((v1) < 0 ? \ 47 ((v2) < 0 && \ 48 NNFITS(LONG_MIN, (v1), (v2))) ? NUM_UNDER : NUM_OK : \ 49 (v1) > 0 ? \ 50 (v2) > 0 && \ 51 NPFITS(LONG_MAX, (v1), (v2)) ? NUM_OK : NUM_OVER : \ 52 NUM_OK) 53 #define NADD_USLONG(sp, v1, v2) \ 54 (NPFITS(ULONG_MAX, (v1), (v2)) ? NUM_OK : NUM_OVER) 55 56 /* Macros for min/max. */ 57 #undef MIN 58 #undef MAX 59 #define MIN(_a,_b) ((_a)<(_b)?(_a):(_b)) 60 #define MAX(_a,_b) ((_a)<(_b)?(_b):(_a)) 61 62 /* Operations on timespecs */ 63 #undef timespecclear 64 #undef timespecisset 65 #undef timespeccmp 66 #undef timespecadd 67 #undef timespecsub 68 #define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0) 69 #define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec) 70 #define timespeccmp(tvp, uvp, cmp) \ 71 (((tvp)->tv_sec == (uvp)->tv_sec) ? \ 72 ((tvp)->tv_nsec cmp (uvp)->tv_nsec) : \ 73 ((tvp)->tv_sec cmp (uvp)->tv_sec)) 74 #define timespecadd(vvp, uvp) \ 75 do { \ 76 (vvp)->tv_sec += (uvp)->tv_sec; \ 77 (vvp)->tv_nsec += (uvp)->tv_nsec; \ 78 if ((vvp)->tv_nsec >= 1000000000) { \ 79 (vvp)->tv_sec++; \ 80 (vvp)->tv_nsec -= 1000000000; \ 81 } \ 82 } while (0) 83 #define timespecsub(vvp, uvp) \ 84 do { \ 85 (vvp)->tv_sec -= (uvp)->tv_sec; \ 86 (vvp)->tv_nsec -= (uvp)->tv_nsec; \ 87 if ((vvp)->tv_nsec < 0) { \ 88 (vvp)->tv_sec--; \ 89 (vvp)->tv_nsec += 1000000000; \ 90 } \ 91 } while (0) 92