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Add [-DWMY] flags for date adjustment.
Discussed with: freebsd-hackers
This commit is contained in:
Brian Somers
parent
b0ed9cd762
commit
7ca215a690
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=27874
@ -1,8 +1,8 @@
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# @(#)Makefile 8.1 (Berkeley) 5/31/93
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# $Id$
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# $Id: Makefile,v 1.4 1997/02/22 14:02:30 peter Exp $
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PROG= date
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SRCS= date.c netdate.c
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SRCS= date.c netdate.c vary.c
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DPADD= ${LIBUTIL}
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LDADD= -lutil
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@ -33,7 +33,7 @@
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)date.1 8.3 (Berkeley) 4/28/95
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.\" $Id: date.1,v 1.11 1997/02/22 14:02:31 peter Exp $
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.\" $Id: date.1,v 1.12 1997/04/16 05:59:20 danny Exp $
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.\"
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.Dd November 17, 1993
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.Dt DATE 1
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@ -48,7 +48,8 @@
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.Op Fl t Ar minutes_west
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.Op Fl nu
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.Op Cm + Ns Ar format
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.Op [yy[mm[dd[hh]]]]mm[\&.ss]
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.Op Fl DWMY Ar [+|-]val
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.Op [[[[yy]mm]dd]hh]mm[\&.ss]
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.Sh DESCRIPTION
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.Nm
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displays the current date and time when invoked without arguments.
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@ -97,6 +98,27 @@ by future calls to
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Display or set the date in
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.Tn UCT
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(universal) time.
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.It Fl DWMY
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Adjust the month day, week day, month or year according to
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.Ar val .
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If
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.Ar val
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is preceeded with a plus or minus sign, the date is adjusted forwards
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or backwards according to the remaining string, otherwise the relevent
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part of the date is set. The date can be adjusted as many times as
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required using these flags. Flags are processed in the order given.
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.Pp
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Month days are in the range 1-31, week days are in the range 0-6
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(sun-sat), months are in the range 1-12 (jan-dec) and years are in
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the range 80-38 or 1980-2038.
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.Pp
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The week day or month may be specified using a name rather than a
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number. If a name is used with the plus (or minus) sign, the date
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will be put forwards (or backwards) to the next (previous) date that
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matches the given week day or month. This will not adjust the date
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if the given week day or month is the same as the current one.
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.Pp
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Refer to the examples below for further details.
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.El
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.Pp
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An operand with a leading plus (``+'') sign signals a user-defined format
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@ -150,6 +172,40 @@ TIME: 13:36:16
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.Pp
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The command:
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.Bd -literal -offset indent
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date -M1 -Y+1
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.Ed
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.Pp
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will display:
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.Bd -literal -offset indent
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Sun Jan 4 03:15:24 GMT 1998
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.Ed
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.Pp
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(where it is currently Mon Aug 4 04:15:24 BST 1997).
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.Pp
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The command:
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.Bd -literal -offset indent
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date -D1 -M3 -Y0 -D-1
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.Ed
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.Pp
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will display the last day of February in the year 2000:
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.Bd -literal -offset indent
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Tue Feb 29 03:18:00 GMT 2000
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.Ed
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.Pp
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The command:
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.Bd -literal -offset indent
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date -D1 -M+1 -D-1 -W-fri
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.Ed
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.Pp
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will display the last friday of the month:
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.Bd -literal -offset indent
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Fri Aug 29 04:31:11 BST 1997
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.Ed
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.Pp
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(where it is currently Mon Aug 4 04:31:11 BST 1997).
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.Pp
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The command:
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.Bd -literal -offset indent
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date 8506131627
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.Ed
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.Pp
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@ -30,7 +30,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: date.c,v 1.12 1997/04/16 05:59:21 danny Exp $
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* $Id: date.c,v 1.13 1997/06/06 06:34:37 charnier Exp $
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*/
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#ifndef lint
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@ -57,6 +57,7 @@ static char const sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95";
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#include <locale.h>
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#include "extern.h"
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#include "vary.h"
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time_t tval;
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int retval, nflag;
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@ -79,12 +80,16 @@ main(argc, argv)
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char *format, buf[1024];
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char *endptr;
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int set_timezone;
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struct vary *v;
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const struct vary *badv;
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struct tm lt;
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v = NULL;
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(void) setlocale(LC_TIME, "");
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tz.tz_dsttime = tz.tz_minuteswest = 0;
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rflag = 0;
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set_timezone = 0;
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while ((ch = getopt(argc, argv, "d:nr:ut:")) != -1)
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while ((ch = getopt(argc, argv, "D:W:M:Y:d:nr:ut:")) != -1)
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switch((char)ch) {
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case 'd': /* daylight savings time */
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tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0;
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@ -109,6 +114,12 @@ main(argc, argv)
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usage();
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set_timezone = 1;
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break;
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case 'D':
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case 'W':
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case 'M':
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case 'Y':
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v = vary_append(v, ch, optarg);
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break;
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default:
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usage();
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}
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@ -141,7 +152,16 @@ main(argc, argv)
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if (*argv && **argv == '+')
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format = *argv + 1;
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(void)strftime(buf, sizeof(buf), format, localtime(&tval));
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lt = *localtime(&tval);
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badv = vary_apply(v, <);
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if (badv) {
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fprintf(stderr, "-%c %s: Cannot apply date adjustment\n",
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badv->flag, badv->arg);
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vary_destroy(v);
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usage();
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}
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vary_destroy(v);
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(void)strftime(buf, sizeof(buf), format, <);
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(void)printf("%s\n", buf);
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exit(retval);
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}
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@ -239,6 +259,6 @@ usage()
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{
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(void)fprintf(stderr, "%s\n%s\n",
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"usage: date [-nu] [-d dst] [-r seconds] [-t west] [+format]",
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" [yy[mm[dd[hh]]]]mm[.ss]]");
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" [-DWMY [+|-]val] [[[[yy]mm]dd]HH]MM[.ss]]");
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exit(1);
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}
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337
bin/date/vary.c
Normal file
337
bin/date/vary.c
Normal file
@ -0,0 +1,337 @@
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#include <time.h>
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#include <string.h>
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#include <stdlib.h>
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#include "vary.h"
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struct trans {
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int val;
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char *str;
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};
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static struct trans trans_mon[] = {
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{ 1, "jan" }, { 2, "feb" }, { 3, "mar" }, { 4, "apr" }, { 5, "may" },
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{ 6, "jun" }, { 7, "jul" }, { 8, "aug" }, { 9, "sep" }, { 10, "oct" },
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{ 11, "nov" }, { 12, "dec" },
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{ 1, "january" }, { 2, "february" }, { 3, "march" }, { 4, "april" },
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{ 6, "june" }, { 7, "july" }, { 8, "august" }, { 9, "september" },
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{ 10, "october" }, { 11, "november" }, { 12, "december" },
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{ -1, NULL }
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};
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static struct trans trans_wday[] = {
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{ 0, "sun" }, { 1, "mon" }, { 2, "tue" }, { 3, "wed" }, { 4, "thr" },
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{ 4, "thu" }, { 5, "fri" }, { 6, "sat" },
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{ 0, "sunday" }, { 1, "monday" }, { 2, "tuesday" }, { 3, "wednesday" },
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{ 4, "thursday" }, { 5, "friday" }, { 6, "saturday" },
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{ -1, NULL }
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};
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static char digits[] = "0123456789";
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static int
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trans(const struct trans t[], const char *arg)
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{
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int f;
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if (strspn(arg, digits) == strlen(arg))
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return atoi(arg);
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for (f = 0; t[f].val != -1; f++)
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if (!strcasecmp(t[f].str, arg))
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return t[f].val;
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return -1;
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}
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struct vary *
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vary_append(struct vary *v, char flag, char *arg)
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{
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struct vary *result, **nextp;
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if (!strchr("DWMY", flag))
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return 0;
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if (v) {
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result = v;
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while (v->next)
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v = v->next;
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nextp = &v->next;
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} else
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nextp = &result;
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*nextp = (struct vary *)malloc(sizeof(struct vary));
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(*nextp)->flag = flag;
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(*nextp)->arg = arg;
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(*nextp)->next = NULL;
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return result;
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}
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static int mdays[12] = { 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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static int
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daysinmonth(const struct tm *t)
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{
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int year;
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year = t->tm_year + 1900;
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if (t->tm_mon == 1)
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if (!(year % 400))
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return 29;
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else if (!(year % 100))
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return 28;
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else if (!(year % 4))
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return 29;
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else
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return 28;
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else if (t->tm_mon >= 0 && t->tm_mon < 12)
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return mdays[t->tm_mon];
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return 0;
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}
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static int
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adjyear(struct tm *t, char type, int val)
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{
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switch (type) {
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case '+':
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t->tm_year += val;
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break;
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case '-':
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t->tm_year -= val;
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break;
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default:
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t->tm_year = val;
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if (t->tm_year < 69)
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t->tm_year += 100; /* as per date.c */
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else if (t->tm_year > 1900)
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t->tm_year -= 1900; /* struct tm holds years since 1900 */
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break;
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}
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return mktime(t) != -1;
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}
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static int
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sadjyear(struct tm *t, char *arg)
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{
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switch (*arg) {
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case '+':
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case '-':
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return adjyear(t, *arg, atoi(arg+1));
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default:
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return adjyear(t, '\0', atoi(arg));
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}
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}
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static int
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adjmon(struct tm *t, char type, int val, int istext)
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{
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if (val < 0)
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return 0;
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switch (type) {
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case '+':
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if (istext)
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if (val <= t->tm_mon)
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val += 11 - t->tm_mon; /* early next year */
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else
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val -= t->tm_mon + 1; /* later this year */
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if (!adjyear(t, '+', (t->tm_mon + val) / 12))
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return 0;
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val %= 12;
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t->tm_mon += val;
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if (t->tm_mon > 11)
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t->tm_mon -= 12;
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break;
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case '-':
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if (istext)
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if (val-1 > t->tm_mon)
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val = 13 - val + t->tm_mon; /* later last year */
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else
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val = t->tm_mon - val + 1; /* early this year */
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if (!adjyear(t, '-', val / 12))
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return 0;
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val %= 12;
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if (val > t->tm_mon) {
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if (!adjyear(t, '-', 1))
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return 0;
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val -= 12;
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}
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t->tm_mon -= val;
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break;
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default:
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if (val > 12 || val < 1)
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return 0;
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t->tm_mon = --val;
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}
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return mktime(t) != -1;
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}
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static int
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sadjmon(struct tm *t, char *arg)
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{
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int istext;
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int val;
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switch (*arg) {
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case '+':
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case '-':
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istext = strspn(arg+1, digits) != strlen(arg+1);
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val = trans(trans_mon, arg+1);
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return adjmon(t, *arg, val, istext);
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default:
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istext = strspn(arg, digits) != strlen(arg);
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val = trans(trans_mon, arg);
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return adjmon(t, '\0', val, istext);
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}
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}
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static int
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adjday(struct tm *t, char type, int val)
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{
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int mdays;
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switch (type) {
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case '+':
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while (val) {
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mdays = daysinmonth(t);
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if (val > mdays - t->tm_mday) {
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val -= mdays - t->tm_mday + 1;
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t->tm_mday = 1;
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if (!adjmon(t, '+', 1, 0))
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return 0;
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} else {
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t->tm_mday += val;
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val = 0;
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}
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}
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break;
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case '-':
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while (val)
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if (val >= t->tm_mday) {
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val -= t->tm_mday;
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t->tm_mday = 1;
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if (!adjmon(t, '-', 1, 0))
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return 0;
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t->tm_mday = daysinmonth(t);
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} else {
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t->tm_mday -= val;
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val = 0;
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}
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break;
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default:
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if (val > 0 && val <= daysinmonth(t))
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t->tm_mday = val;
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else
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return 0;
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break;
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}
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return mktime(t) != -1;
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}
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static int
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sadjwday(struct tm *t, char *arg)
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{
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int istext;
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int val;
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switch (*arg) {
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case '+':
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case '-':
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istext = strspn(arg+1, digits) != strlen(arg+1);
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val = trans(trans_wday, arg+1);
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break;
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default:
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istext = 0;
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val = trans(trans_wday, arg);
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break;
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}
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if (val < 0)
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return 0;
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switch (*arg) {
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case '+':
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if (istext)
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if (val < t->tm_wday)
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val = 7 - t->tm_wday + val; /* early next week */
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else
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val -= t->tm_wday; /* later this week */
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else
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val *= 7; /* "-W +5" == "5 weeks in the future" */
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return adjday(t, '+', val);
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case '-':
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if (istext)
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if (val > t->tm_wday)
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val = 7 - val + t->tm_wday; /* later last week */
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else
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val = t->tm_wday - val; /* early this week */
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else
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val *= 7; /* "-W -5" == "5 weeks ago" */
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return adjday(t, '-', val);
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default:
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if (val < t->tm_wday)
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return adjday(t, '-', t->tm_wday - val);
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else if (val > 6)
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return 0;
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else if (val > t->tm_wday)
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return adjday(t, '+', val - t->tm_wday);
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}
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return 1;
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}
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static int
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sadjday(struct tm *t, char *arg)
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{
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switch (*arg) {
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case '+':
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case '-':
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return adjday(t, *arg, atoi(arg+1));
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default:
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return adjday(t, '\0', atoi(arg));
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}
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}
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const struct vary *
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vary_apply(const struct vary *v, struct tm *t)
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{
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for (; v; v = v->next) {
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switch (v->flag) {
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case 'D':
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if (!sadjday(t, v->arg))
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return v;
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break;
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case 'W':
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if (!sadjwday(t, v->arg))
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return v;
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break;
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case 'M':
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if (!sadjmon(t, v->arg))
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return v;
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break;
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case 'Y':
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if (!sadjyear(t, v->arg))
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return v;
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break;
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default:
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return v;
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||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
vary_destroy(struct vary *v)
|
||||
{
|
||||
struct vary *n;
|
||||
|
||||
while (v) {
|
||||
n = v->next;
|
||||
free(v);
|
||||
v = n;
|
||||
}
|
||||
}
|
||||
9
bin/date/vary.h
Normal file
9
bin/date/vary.h
Normal file
@ -0,0 +1,9 @@
|
||||
struct vary {
|
||||
char flag;
|
||||
char *arg;
|
||||
struct vary *next;
|
||||
};
|
||||
|
||||
extern struct vary *vary_append(struct vary *v, char flag, char *arg);
|
||||
extern const struct vary *vary_apply(const struct vary *v, struct tm *t);
|
||||
extern void vary_destroy(struct vary *v);
|
||||
Loading…
Reference in New Issue
Block a user