new touch
This commit is contained in:
glass
parent
ec60b03fb9
commit
8b8c96cad4
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@ -32,44 +32,136 @@
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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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.\" @(#)touch.1 6.4 (Berkeley) 6/27/91
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.\" @(#)touch.1 6.5 (Berkeley) 3/6/93
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.\"
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.Dd June 27, 1991
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.Dd March 6, 1993
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.Dt TOUCH 1
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.Os
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.Sh NAME
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.Nm touch
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.Nd update date last modified of a file
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.Nd change file access and modification times
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.Sh SYNOPSIS
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.Nm touch
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.Op Fl c
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.Op Fl f
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.Op Fl acfm
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.Op Fl r Ar file
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.Op Fl t [[CC]YY]MMDDhhmm[.SS]
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.Ar file ...
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.Sh DESCRIPTION
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The
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.Nm touch
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utility
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changes the modification and or access times
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of the given
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.Ar file .
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utility sets the modification and access times of files to the
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current time of day.
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If the file doesn't exist, it is created with default permissions.
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.Pp
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Available options:
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The following options are available:
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.Bl -tag -width Ds
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.It Fl a
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Change the access time of the file.
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The modification time of the file is not changed unless the
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.Fl m
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flag is also specified.
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.It Fl c
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Do not create a specified file if it does not exist.
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Do not write any diagnostic messages concerning this
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condition.
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.It Fl f
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Attempt to force the
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Do not create the file if it does not exist.
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The
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.Nm touch
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in spite of read and write permissions on a
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.Ar file .
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utility does not treat this as an error.
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No error messages are displayed and the exit value is not affected.
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.It Fl f
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Attempt to force the update, even if the file permissions do not
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currently permit it.
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.It Fl m
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Change the modification time of the file.
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The access time of the file is not changed unless the
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.Fl a
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flag is also specified.
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.It Fl r
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Use the access and modifications times from the specified file
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instead of the current time of day.
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.It Fl t
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Change the access and modification times to the specified time.
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The argument should be in the form
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.Dq [[CC]YY]MMDDhhmm[.SS]
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where each pair of letters represents the following:
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.Pp
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.Bl -tag -width Ds -compact -offset indent
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.It Ar CC
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The first two digits of the year (the century).
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.It Ar YY
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The second two digits of the year.
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If
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.Dq YY
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is specified, but
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.Dq CC
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is not, a value for
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.Dq YY
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between 69 and 99 results in a
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.Dq YY
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value of 19.
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Otherwise, a
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.Dq YY
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value of 20 is used.
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.It Ar MM
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The month of the year, from 1 to 12.
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.It Ar DD
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the day of the month, from 1 to 31.
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.It Ar hh
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The hour of the day, from 0 to 23.
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.It Ar mm
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The minute of the hour, from 0 to 59.
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.It Ar SS
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The second of the minute, from 0 to 61.
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.El
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.Pp
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If the
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.Dq CC
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and
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.Dq YY
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letter pairs are not specified, the values default to the current
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year.
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If the
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.Dq SS
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letter pair is not specified, the value defaults to 0.
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.El
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.Pp
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The
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.Nm touch
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utility exits 0 on success, and >0 if an error occurs.
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.Sh SEE ALSO
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.Xr utimes 2
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.Sh COMPATIBILITY
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The obsolescent form of
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.Nm touch ,
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where a time format is specified as the first argument, is supported.
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When no
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.Fl r
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or
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.Fl t
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option is specified, there are at least two arguments, and the first
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argument is a string of digits either eight or ten characters in length,
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the first argument is interprested as a time specification of the form
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.Dq MMDDhhmm[YY] .
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.Pp
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The
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.Dq MM ,
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.Dq DD ,
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.Dq hh
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and
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.Dq mm
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letter pairs are treated as their counterparts specified to the
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.Fl t
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option.
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If the
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.Dq YY
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letter pair is in the range 69 to 99, the year is set to 1969 to 1999,
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otherwise, the year is set in the 21st century.
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.Sh HISTORY
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A
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.Nm
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.Nm touch
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command appeared in
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.At v7 .
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This command is
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.Ud .
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.Sh STANDARDS
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The
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.Nm touch
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function is expected to be a superset of the
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.St -p1003.2
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specification.
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 1988 Regents of the University of California.
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* Copyright (c) 1993 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -33,129 +33,318 @@
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1988 Regents of the University of California.\n\
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"@(#) Copyright (c) 1993 Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)touch.c 4.8 (Berkeley) 6/1/90";
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static char sccsid[] = "@(#)touch.c 5.5 (Berkeley) 3/7/93";
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#endif /* not lint */
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/*
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* Attempt to set the modify date of a file to the current date. If the
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* file exists, read and write its first character. If the file doesn't
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* exist, create it, unless -c option prevents it. If the file is read-only,
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* -f forces chmod'ing and touch'ing.
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*/
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#include <sys/types.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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static int dontcreate; /* set if -c option */
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static int force; /* set if -f option */
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int rw __P((char *, struct stat *, int));
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void stime_arg1 __P((char *, struct timeval *));
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void stime_arg2 __P((char *, int, struct timeval *));
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void stime_file __P((char *, struct timeval *));
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void usage __P((void));
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/*temporary we aren't 4.4 portability hack*/
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#define TIMET_TO_TIMEVAL(timevalp, tp) (timevalp)->tv_sec = *(tp);
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int
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main(argc, argv)
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int argc;
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char **argv;
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char *argv[];
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{
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extern int optind;
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int ch, retval;
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struct stat sb;
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struct timeval tv[2];
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int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset;
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char *p;
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dontcreate = force = retval = 0;
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while ((ch = getopt(argc, argv, "cf")) != EOF)
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switch((char)ch) {
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aflag = cflag = fflag = mflag = timeset = 0;
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if (gettimeofday(&tv[0], NULL))
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err(1, "gettimeofday");
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while ((ch = getopt(argc, argv, "acfmr:t:")) != EOF)
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switch(ch) {
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case 'a':
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aflag = 1;
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break;
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case 'c':
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dontcreate = 1;
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cflag = 1;
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break;
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case 'f':
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force = 1;
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fflag = 1;
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break;
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case 'm':
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mflag = 1;
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break;
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case 'r':
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timeset = 1;
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stime_file(optarg, tv);
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break;
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case 't':
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timeset = 1;
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stime_arg1(optarg, tv);
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break;
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case '?':
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default:
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usage();
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}
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if (!*(argv += optind))
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argc -= optind;
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argv += optind;
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/* Default is both -a and -m. */
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if (aflag == 0 && mflag == 0)
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aflag = mflag = 1;
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/*
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* If no -r or -t flag, at least two operands, the first of which
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* is an 8 or 10 digit number, use the obsolete time specification.
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*/
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if (!timeset && argc > 1) {
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(void)strtol(argv[0], &p, 10);
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len = p - argv[0];
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if (*p == '\0' && (len == 8 || len == 10)) {
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timeset = 1;
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stime_arg2(argv[0], len == 10, tv);
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}
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}
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/* Otherwise use the current time of day. */
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if (!timeset)
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tv[1] = tv[0];
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if (*argv == NULL)
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usage();
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do {
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retval |= touch(*argv);
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} while (*++argv);
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exit(retval);
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for (rval = 0; *argv; ++argv) {
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/* See if the file exists. */
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if (stat(*argv, &sb))
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if (!cflag) {
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/* Create the file. */
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fd = open(*argv,
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O_WRONLY | O_CREAT, DEFFILEMODE);
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if (fd == -1 || fstat(fd, &sb) || close(fd)) {
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rval = 1;
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warn("%s", *argv);
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continue;
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}
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/* If using the current time, we're done. */
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if (!timeset)
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continue;
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} else
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continue;
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if (!aflag)
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/* TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);*/
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TIMET_TO_TIMEVAL(&tv[0], &sb.st_atime);
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if (!mflag)
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/* TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);*/
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TIMET_TO_TIMEVAL(&tv[1], &sb.st_mtime);
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/* Try utimes(2). */
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if (!utimes(*argv, tv))
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continue;
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/* If the user specified a time, nothing else we can do. */
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if (timeset) {
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rval = 1;
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warn("%s", *argv);
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}
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/*
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* System V and POSIX 1003.1 require that a NULL argument
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* set the access/modification times to the current time.
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* The permission checks are different, too, in that the
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* ability to write the file is sufficient. Take a shot.
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*/
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if (!utimes(*argv, NULL))
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continue;
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/* Try reading/writing. */
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if (rw(*argv, &sb, fflag))
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rval = 1;
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}
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exit(rval);
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}
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touch(filename)
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char *filename;
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#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
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void
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stime_arg1(arg, tvp)
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char *arg;
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struct timeval *tvp;
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{
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struct stat statbuffer;
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if (stat(filename, &statbuffer) == -1) {
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if (!dontcreate)
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return(readwrite(filename, 0L));
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fprintf(stderr, "touch: %s: does not exist\n", filename);
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return(1);
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struct tm *t;
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int yearset;
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char *p;
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/* Start with the current time. */
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if ((t = localtime(&tvp[0].tv_sec)) == NULL)
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err(1, "localtime");
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/* [[CC]YY]MMDDhhmm[.SS] */
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if ((p = strchr(arg, '.')) == NULL)
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t->tm_sec = 0; /* Seconds defaults to 0. */
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else {
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if (strlen(p + 1) != 2)
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goto terr;
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*p++ = '\0';
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t->tm_sec = ATOI2(p);
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}
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if ((statbuffer.st_mode & S_IFMT) != S_IFREG) {
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fprintf(stderr, "touch: %s: can only touch regular files\n",
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filename);
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return(1);
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}
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if (!access(filename, R_OK | W_OK))
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return(readwrite(filename,statbuffer.st_size));
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if (force) {
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int retval;
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if (chmod(filename, 0666)) {
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fprintf(stderr, "touch: %s: couldn't chmod: ",
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filename);
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perror((char *)NULL);
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return(1);
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yearset = 0;
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switch(strlen(arg)) {
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case 12: /* CCYYMMDDhhmm */
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t->tm_year = ATOI2(arg);
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t->tm_year *= 1000;
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yearset = 1;
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/* FALLTHOUGH */
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case 10: /* YYMMDDhhmm */
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if (yearset) {
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yearset = ATOI2(arg);
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t->tm_year += yearset;
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} else {
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yearset = ATOI2(arg);
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if (yearset < 69)
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t->tm_year = yearset + 2000;
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else
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t->tm_year = yearset + 1900;
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}
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retval = readwrite(filename, statbuffer.st_size);
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if (chmod(filename, statbuffer.st_mode)) {
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fprintf(stderr, "touch: %s: couldn't chmod back: ",
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filename);
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perror((char *)NULL);
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return(1);
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}
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return(retval);
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t->tm_year -= 1900; /* Convert to UNIX time. */
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/* FALLTHROUGH */
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case 8: /* MMDDhhmm */
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t->tm_mon = ATOI2(arg);
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--t->tm_mon; /* Convert from 01-12 to 00-11 */
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t->tm_mday = ATOI2(arg);
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t->tm_hour = ATOI2(arg);
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t->tm_min = ATOI2(arg);
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break;
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default:
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goto terr;
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}
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fprintf(stderr, "touch: %s: cannot touch\n", filename);
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return(1);
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t->tm_isdst = -1; /* Figure out DST. */
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tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
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if (tvp[0].tv_sec == -1)
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terr: errx(1,
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"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
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tvp[0].tv_usec = tvp[1].tv_usec = 0;
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}
|
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|
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readwrite(filename, size)
|
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char *filename;
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off_t size;
|
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void
|
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stime_arg2(arg, year, tvp)
|
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char *arg;
|
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int year;
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struct timeval *tvp;
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{
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int filedescriptor;
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char first;
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off_t lseek();
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struct tm *t;
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/* Start with the current time. */
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if ((t = localtime(&tvp[0].tv_sec)) == NULL)
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err(1, "localtime");
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if (size) {
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filedescriptor = open(filename, O_RDWR, 0);
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if (filedescriptor == -1) {
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error: fprintf(stderr, "touch: %s: ", filename);
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perror((char *)NULL);
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return(1);
|
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}
|
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if (read(filedescriptor, &first, 1) != 1)
|
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goto error;
|
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if (lseek(filedescriptor, 0L, 0) == -1)
|
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goto error;
|
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if (write(filedescriptor, &first, 1) != 1)
|
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goto error;
|
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t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */
|
||||
--t->tm_mon; /* Convert from 01-12 to 00-11 */
|
||||
t->tm_mday = ATOI2(arg);
|
||||
t->tm_hour = ATOI2(arg);
|
||||
t->tm_min = ATOI2(arg);
|
||||
if (year)
|
||||
t->tm_year = ATOI2(arg);
|
||||
|
||||
t->tm_isdst = -1; /* Figure out DST. */
|
||||
tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
|
||||
if (tvp[0].tv_sec == -1)
|
||||
errx(1,
|
||||
"out of range or illegal time specification: MMDDhhmm[yy]");
|
||||
|
||||
tvp[0].tv_usec = tvp[1].tv_usec = 0;
|
||||
}
|
||||
|
||||
void
|
||||
stime_file(fname, tvp)
|
||||
char *fname;
|
||||
struct timeval *tvp;
|
||||
{
|
||||
struct stat sb;
|
||||
|
||||
if (stat(fname, &sb))
|
||||
err(1, "%s", fname);
|
||||
/* TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);*/
|
||||
TIMET_TO_TIMEVAL(tvp, &sb.st_atime);
|
||||
/* TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);*/
|
||||
TIMET_TO_TIMEVAL(tvp + 1, &sb.st_mtime);
|
||||
}
|
||||
|
||||
int
|
||||
rw(fname, sbp, force)
|
||||
char *fname;
|
||||
struct stat *sbp;
|
||||
int force;
|
||||
{
|
||||
int fd, needed_chmod, rval;
|
||||
u_char byte;
|
||||
|
||||
/* Try regular files and directories. */
|
||||
if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) {
|
||||
warnx("%s: %s", fname, strerror(EFTYPE));
|
||||
return (1);
|
||||
}
|
||||
|
||||
needed_chmod = rval = 0;
|
||||
if ((fd = open(fname, O_RDWR, 0)) == -1) {
|
||||
if (!force || chmod(fname, DEFFILEMODE))
|
||||
goto err;
|
||||
if ((fd = open(fname, O_RDWR, 0)) == -1)
|
||||
goto err;
|
||||
needed_chmod = 1;
|
||||
}
|
||||
|
||||
if (sbp->st_size != 0) {
|
||||
if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
|
||||
goto err;
|
||||
if (lseek(fd, (off_t)0, SEEK_SET) == -1)
|
||||
goto err;
|
||||
if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
|
||||
goto err;
|
||||
} else {
|
||||
filedescriptor = creat(filename, 0666);
|
||||
if (filedescriptor == -1)
|
||||
goto error;
|
||||
if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
|
||||
err: rval = 1;
|
||||
warn("%s", fname);
|
||||
} else if (ftruncate(fd, (off_t)0)) {
|
||||
rval = 1;
|
||||
warn("%s: file modified", fname);
|
||||
}
|
||||
}
|
||||
if (close(filedescriptor) == -1)
|
||||
goto error;
|
||||
return(0);
|
||||
|
||||
if (close(fd) && rval != 1) {
|
||||
rval = 1;
|
||||
warn("%s", fname);
|
||||
}
|
||||
if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
|
||||
rval = 1;
|
||||
warn("%s: permissions modified", fname);
|
||||
}
|
||||
return (rval);
|
||||
}
|
||||
|
||||
__dead void
|
||||
usage()
|
||||
{
|
||||
fprintf(stderr, "usage: touch [-cf] file ...\n");
|
||||
(void)fprintf(stderr,
|
||||
"usage: touch [-acfm] [-r file] [-t time] file ...\n");
|
||||
exit(1);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue