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166 lines
5.3 KiB
C
166 lines
5.3 KiB
C
/* systime.h - System-dependent definitions for time manipulations.
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Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifdef TIME_WITH_SYS_TIME
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#include <sys/time.h>
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#include <time.h>
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#else
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else
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#include <time.h>
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#endif
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#endif
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#ifdef HAVE_TZNAME
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#ifndef tzname /* For SGI. */
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extern char *tzname[]; /* RS6000 and others want it this way. */
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#endif
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#endif
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/* SVr4 doesn't actually declare this in its #include files. */
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#ifdef USG5_4
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extern long timezone;
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#endif
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#ifdef VMS
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#ifdef VAXC
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#include "vmstime.h"
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#endif
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#endif
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/* On some configurations (hpux8.0, X11R4), sys/time.h and X11/Xos.h
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disagree about the name of the guard symbol. */
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#ifdef HPUX
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#ifdef _STRUCT_TIMEVAL
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#ifndef __TIMEVAL__
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#define __TIMEVAL__
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#endif
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#endif
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#endif
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/* EMACS_TIME is the type to use to represent temporal intervals -
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struct timeval on some systems, int on others. It can be passed as
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the timeout argument to the select system call.
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EMACS_SECS (TIME) is an rvalue for the seconds component of TIME.
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EMACS_SET_SECS (TIME, SECONDS) sets that to SECONDS.
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EMACS_HAS_USECS is defined iff EMACS_TIME has a usecs component.
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EMACS_USECS (TIME) is an rvalue for the microseconds component of TIME.
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This returns zero if EMACS_TIME doesn't have a microseconds component.
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EMACS_SET_USECS (TIME, MICROSECONDS) sets that to MICROSECONDS.
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This does nothing if EMACS_TIME doesn't have a microseconds component.
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EMACS_SET_SECS_USECS (TIME, SECS, USECS) sets both components of TIME.
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EMACS_GET_TIME (TIME) stores the current system time in TIME, which
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should be an lvalue.
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EMACS_ADD_TIME (DEST, SRC1, SRC2) adds SRC1 to SRC2 and stores the
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result in DEST. SRC should not be negative.
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EMACS_SUB_TIME (DEST, SRC1, SRC2) subtracts SRC2 from SRC1 and
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stores the result in DEST. SRC should not be negative.
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EMACS_TIME_NEG_P (TIME) is true iff TIME is negative.
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*/
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#ifdef HAVE_TIMEVAL
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#define EMACS_HAS_USECS
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#define EMACS_TIME struct timeval
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#define EMACS_SECS(time) ((time).tv_sec + 0)
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#define EMACS_USECS(time) ((time).tv_usec + 0)
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#define EMACS_SET_SECS(time, seconds) ((time).tv_sec = (seconds))
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#define EMACS_SET_USECS(time, microseconds) ((time).tv_usec = (microseconds))
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/* On SVR4, the compiler may complain if given this extra BSD arg. */
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#ifdef GETTIMEOFDAY_ONE_ARGUMENT
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#define EMACS_GET_TIME(time) gettimeofday (&(time))
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#else /* not GETTIMEOFDAY_ONE_ARGUMENT */
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#define EMACS_GET_TIME(time) \
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do { \
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struct timezone dummy; \
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gettimeofday (&(time), &dummy); \
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} while (0)
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#endif /* not GETTIMEOFDAY_ONE_ARGUMENT */
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#define EMACS_ADD_TIME(dest, src1, src2) \
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do { \
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(dest).tv_sec = (src1).tv_sec + (src2).tv_sec; \
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(dest).tv_usec = (src1).tv_usec + (src2).tv_usec; \
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if ((dest).tv_usec > 1000000) \
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(dest).tv_usec -= 1000000, (dest).tv_sec++; \
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} while (0)
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#define EMACS_SUB_TIME(dest, src1, src2) \
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do { \
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(dest).tv_sec = (src1).tv_sec - (src2).tv_sec; \
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(dest).tv_usec = (src1).tv_usec - (src2).tv_usec; \
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if ((dest).tv_usec < 0) \
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(dest).tv_usec += 1000000, (dest).tv_sec--; \
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} while (0)
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#define EMACS_TIME_NEG_P(time) \
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((long)(time).tv_sec < 0 \
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|| ((time).tv_sec == 0 \
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&& (long)(time).tv_usec < 0))
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#else /* ! defined (HAVE_TIMEVAL) */
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#define EMACS_TIME int
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#define EMACS_SECS(time) (time)
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#define EMACS_USECS(time) 0
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#define EMACS_SET_SECS(time, seconds) ((time) = (seconds))
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#define EMACS_SET_USECS(time, usecs) 0
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#define EMACS_GET_TIME(t) ((t) = time ((long *) 0))
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#define EMACS_ADD_TIME(dest, src1, src2) ((dest) = (src1) + (src2))
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#define EMACS_SUB_TIME(dest, src1, src2) ((dest) = (src1) - (src2))
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#define EMACS_TIME_NEG_P(t) ((t) < 0)
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#endif /* ! defined (HAVE_TIMEVAL) */
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#define EMACS_SET_SECS_USECS(time, secs, usecs) \
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(EMACS_SET_SECS (time, secs), EMACS_SET_USECS (time, usecs))
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extern int set_file_times ();
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/* Compare times T1 and T2. Value is 0 if T1 and T2 are the same.
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Value is < 0 if T1 is less than T2. Value is > 0 otherwise. */
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#define EMACS_TIME_CMP(T1, T2) \
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(EMACS_SECS (T1) - EMACS_SECS (T2) \
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+ (EMACS_SECS (T1) == EMACS_SECS (T2) \
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? EMACS_USECS (T1) - EMACS_USECS (T2) \
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: 0))
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/* Compare times T1 and T2 for equality, inequality etc. */
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#define EMACS_TIME_EQ(T1, T2) (EMACS_TIME_CMP (T1, T2) == 0)
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#define EMACS_TIME_NE(T1, T2) (EMACS_TIME_CMP (T1, T2) != 0)
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#define EMACS_TIME_GT(T1, T2) (EMACS_TIME_CMP (T1, T2) > 0)
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#define EMACS_TIME_GE(T1, T2) (EMACS_TIME_CMP (T1, T2) >= 0)
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#define EMACS_TIME_LT(T1, T2) (EMACS_TIME_CMP (T1, T2) < 0)
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#define EMACS_TIME_LE(T1, T2) (EMACS_TIME_CMP (T1, T2) <= 0)
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