libffi/mdate-sh

   1 #!/bin/sh
   2 # Get modification time of a file or directory and pretty-print it.
   3
   4 scriptversion=2009-04-28.21; # UTC
   5
   6 # Copyright (C) 1995, 1996, 1997, 2003, 2004, 2005, 2007, 2009 Free
   7 # Software Foundation, Inc.
   8 # written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, June 1995
   9 #
  10 # This program is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2, or (at your option)
  13 # any later version.
  14 #
  15 # This program is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 # As a special exception to the GNU General Public License, if you
  24 # distribute this file as part of a program that contains a
  25 # configuration script generated by Autoconf, you may include it under
  26 # the same distribution terms that you use for the rest of that program.
  27
  28 # This file is maintained in Automake, please report
  29 # bugs to <bug-automake@gnu.org> or send patches to
  30 # <automake-patches@gnu.org>.
  31
  32 case $1 in
  33   '')
  34      echo "$0: No file.  Try \`$0 --help' for more information." 1>&2
  35      exit 1;
  36      ;;
  37   -h | --h*)
  38     cat <<\EOF
  39 Usage: mdate-sh [--help] [--version] FILE
  40
  41 Pretty-print the modification time of FILE.
  42
  43 Report bugs to <bug-automake@gnu.org>.
  44 EOF
  45     exit $?
  46     ;;
  47   -v | --v*)
  48     echo "mdate-sh $scriptversion"
  49     exit $?
  50     ;;
  51 esac
  52
  53 # Prevent date giving response in another language.
  54 LANG=C
  55 export LANG
  56 LC_ALL=C
  57 export LC_ALL
  58 LC_TIME=C
  59 export LC_TIME
  60
  61 # GNU ls changes its time format in response to the TIME_STYLE
  62 # variable.  Since we cannot assume `unset' works, revert this
  63 # variable to its documented default.
  64 if test "${TIME_STYLE+set}" = set; then
  65   TIME_STYLE=posix-long-iso
  66   export TIME_STYLE
  67 fi
  68
  69 save_arg1=$1
  70
  71 # Find out how to get the extended ls output of a file or directory.
  72 if ls -L /dev/null 1>/dev/null 2>&1; then
  73   ls_command='ls -L -l -d'
  74 else
  75   ls_command='ls -l -d'
  76 fi
  77 # Avoid user/group names that might have spaces, when possible.
  78 if ls -n /dev/null 1>/dev/null 2>&1; then
  79   ls_command="$ls_command -n"
  80 fi
  81
  82 # A `ls -l' line looks as follows on OS/2.
  83 #  drwxrwx---        0 Aug 11  2001 foo
  84 # This differs from Unix, which adds ownership information.
  85 #  drwxrwx---   2 root  root      4096 Aug 11  2001 foo
  86 #
  87 # To find the date, we split the line on spaces and iterate on words
  88 # until we find a month.  This cannot work with files whose owner is a
  89 # user named `Jan', or `Feb', etc.  However, it's unlikely that `/'
  90 # will be owned by a user whose name is a month.  So we first look at
  91 # the extended ls output of the root directory to decide how many
  92 # words should be skipped to get the date.
  93
  94 # On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.
  95 set x`$ls_command /`
  96
  97 # Find which argument is the month.
  98 month=
  99 command=
 100 until test $month
 101 do
 102   shift
 103   # Add another shift to the command.
 104   command="$command shift;"
 105   case $1 in
 106     Jan) month=January; nummonth=1;;
 107     Feb) month=February; nummonth=2;;
 108     Mar) month=March; nummonth=3;;
 109     Apr) month=April; nummonth=4;;
 110     May) month=May; nummonth=5;;
 111     Jun) month=June; nummonth=6;;
 112     Jul) month=July; nummonth=7;;
 113     Aug) month=August; nummonth=8;;
 114     Sep) month=September; nummonth=9;;
 115     Oct) month=October; nummonth=10;;
 116     Nov) month=November; nummonth=11;;
 117     Dec) month=December; nummonth=12;;
 118   esac
 119 done
 120
 121 # Get the extended ls output of the file or directory.
 122 set dummy x`eval "$ls_command \"\$save_arg1\""`
 123
 124 # Remove all preceding arguments
 125 eval $command
 126
 127 # Because of the dummy argument above, month is in $2.
 128 #
 129 # On a POSIX system, we should have
 130 #
 131 # $# = 5
 132 # $1 = file size
 133 # $2 = month
 134 # $3 = day
 135 # $4 = year or time
 136 # $5 = filename
 137 #
 138 # On Darwin 7.7.0 and 7.6.0, we have
 139 #
 140 # $# = 4
 141 # $1 = day
 142 # $2 = month
 143 # $3 = year or time
 144 # $4 = filename
 145
 146 # Get the month.
 147 case $2 in
 148   Jan) month=January; nummonth=1;;
 149   Feb) month=February; nummonth=2;;
 150   Mar) month=March; nummonth=3;;
 151   Apr) month=April; nummonth=4;;
 152   May) month=May; nummonth=5;;
 153   Jun) month=June; nummonth=6;;
 154   Jul) month=July; nummonth=7;;
 155   Aug) month=August; nummonth=8;;
 156   Sep) month=September; nummonth=9;;
 157   Oct) month=October; nummonth=10;;
 158   Nov) month=November; nummonth=11;;
 159   Dec) month=December; nummonth=12;;
 160 esac
 161
 162 case $3 in
 163   ???*) day=$1;;
 164   *) day=$3; shift;;
 165 esac
 166
 167 # Here we have to deal with the problem that the ls output gives either
 168 # the time of day or the year.
 169 case $3 in
 170   *:*) set `date`; eval year=\$$#
 171        case $2 in
 172          Jan) nummonthtod=1;;
 173          Feb) nummonthtod=2;;
 174          Mar) nummonthtod=3;;
 175          Apr) nummonthtod=4;;
 176          May) nummonthtod=5;;
 177          Jun) nummonthtod=6;;
 178          Jul) nummonthtod=7;;
 179          Aug) nummonthtod=8;;
 180          Sep) nummonthtod=9;;
 181          Oct) nummonthtod=10;;
 182          Nov) nummonthtod=11;;
 183          Dec) nummonthtod=12;;
 184        esac
 185        # For the first six month of the year the time notation can also
 186        # be used for files modified in the last year.
 187        if (expr $nummonth \> $nummonthtod) > /dev/null;
 188        then
 189          year=`expr $year - 1`
 190        fi;;
 191   *) year=$3;;
 192 esac
 193
 194 # The result.
 195 echo $day $month $year
 196
 197 # Local Variables:
 198 # mode: shell-script
 199 # sh-indentation: 2
 200 # eval: (add-hook 'write-file-hooks 'time-stamp)
 201 # time-stamp-start: "scriptversion="
 202 # time-stamp-format: "%:y-%02m-%02d.%02H"
 203 # time-stamp-time-zone: "UTC"
 204 # time-stamp-end: "; # UTC"
 205 # End: