diff options
Diffstat (limited to 'contrib/nvi/common/util.h')
| -rw-r--r-- | contrib/nvi/common/util.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/contrib/nvi/common/util.h b/contrib/nvi/common/util.h new file mode 100644 index 0000000..46edb4a --- /dev/null +++ b/contrib/nvi/common/util.h @@ -0,0 +1,56 @@ +/*- + * 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) |
