gprofng/doc/mdate-sh

   1 #!/bin/sh
   2 # Get modification time of a file or directory and pretty-print it.
   3
   4 scriptversion=2016-01-11.22; # UTC
   5
   6 # Copyright (C) 1995-2024 Free Software Foundation, Inc.
   7 # written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, June 1995
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2, or (at your option)
  12 # any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 # As a special exception to the GNU General Public License, if you
  23 # distribute this file as part of a program that contains a
  24 # configuration script generated by Autoconf, you may include it under
  25 # the same distribution terms that you use for the rest of that program.
  26
  27 # This file is maintained in Automake, please report
  28 # bugs to <bug-automake@gnu.org> or send patches to
  29 # <automake-patches@gnu.org>.
  30
  31 if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
  32   emulate sh
  33   NULLCMD=:
  34   # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which
  35   # is contrary to our usage.  Disable this feature.
  36   alias -g '${1+"$@"}'='"$@"'
  37   setopt NO_GLOB_SUBST
  38 fi
  39
  40 case $1 in
  41   '')
  42      echo "$0: No file.  Try '$0 --help' for more information." 1>&2
  43      exit 1;
  44      ;;
  45   -h | --h*)
  46     cat <<\EOF
  47 Usage: mdate-sh [--help] [--version] FILE
  48
  49 Pretty-print the modification day of FILE, in the format:
  50 1 January 1970
  51
  52 Report bugs to <bug-automake@gnu.org>.
  53 EOF
  54     exit $?
  55     ;;
  56   -v | --v*)
  57     echo "mdate-sh $scriptversion"
  58     exit $?
  59     ;;
  60 esac
  61
  62 error ()
  63 {
  64   echo "$0: $1" >&2
  65   exit 1
  66 }
  67
  68
  69 # Prevent date giving response in another language.
  70 LANG=C
  71 export LANG
  72 LC_ALL=C
  73 export LC_ALL
  74 LC_TIME=C
  75 export LC_TIME
  76
  77 # GNU ls changes its time format in response to the TIME_STYLE
  78 # variable.  Since we cannot assume 'unset' works, revert this
  79 # variable to its documented default.
  80 if test "${TIME_STYLE+set}" = set; then
  81   TIME_STYLE=posix-long-iso
  82   export TIME_STYLE
  83 fi
  84
  85 save_arg1=$1
  86
  87 # Find out how to get the extended ls output of a file or directory.
  88 if ls -L /dev/null 1>/dev/null 2>&1; then
  89   ls_command='ls -L -l -d'
  90 else
  91   ls_command='ls -l -d'
  92 fi
  93 # Avoid user/group names that might have spaces, when possible.
  94 if ls -n /dev/null 1>/dev/null 2>&1; then
  95   ls_command="$ls_command -n"
  96 fi
  97
  98 # A 'ls -l' line looks as follows on OS/2.
  99 #  drwxrwx---        0 Aug 11  2001 foo
 100 # This differs from Unix, which adds ownership information.
 101 #  drwxrwx---   2 root  root      4096 Aug 11  2001 foo
 102 #
 103 # To find the date, we split the line on spaces and iterate on words
 104 # until we find a month.  This cannot work with files whose owner is a
 105 # user named "Jan", or "Feb", etc.  However, it's unlikely that '/'
 106 # will be owned by a user whose name is a month.  So we first look at
 107 # the extended ls output of the root directory to decide how many
 108 # words should be skipped to get the date.
 109
 110 # On HPUX /bin/sh, "set" interprets "-rw-r--r--" as options, so the "x" below.
 111 set x`$ls_command /`
 112
 113 # Find which argument is the month.
 114 month=
 115 command=
 116 until test $month
 117 do
 118   test $# -gt 0 || error "failed parsing '$ls_command /' output"
 119   shift
 120   # Add another shift to the command.
 121   command="$command shift;"
 122   case $1 in
 123     Jan) month=January; nummonth=1;;
 124     Feb) month=February; nummonth=2;;
 125     Mar) month=March; nummonth=3;;
 126     Apr) month=April; nummonth=4;;
 127     May) month=May; nummonth=5;;
 128     Jun) month=June; nummonth=6;;
 129     Jul) month=July; nummonth=7;;
 130     Aug) month=August; nummonth=8;;
 131     Sep) month=September; nummonth=9;;
 132     Oct) month=October; nummonth=10;;
 133     Nov) month=November; nummonth=11;;
 134     Dec) month=December; nummonth=12;;
 135   esac
 136 done
 137
 138 test -n "$month" || error "failed parsing '$ls_command /' output"
 139
 140 # Get the extended ls output of the file or directory.
 141 set dummy x`eval "$ls_command \"\\\$save_arg1\""`
 142
 143 # Remove all preceding arguments
 144 eval $command
 145
 146 # Because of the dummy argument above, month is in $2.
 147 #
 148 # On a POSIX system, we should have
 149 #
 150 # $# = 5
 151 # $1 = file size
 152 # $2 = month
 153 # $3 = day
 154 # $4 = year or time
 155 # $5 = filename
 156 #
 157 # On Darwin 7.7.0 and 7.6.0, we have
 158 #
 159 # $# = 4
 160 # $1 = day
 161 # $2 = month
 162 # $3 = year or time
 163 # $4 = filename
 164
 165 # Get the month.
 166 case $2 in
 167   Jan) month=January; nummonth=1;;
 168   Feb) month=February; nummonth=2;;
 169   Mar) month=March; nummonth=3;;
 170   Apr) month=April; nummonth=4;;
 171   May) month=May; nummonth=5;;
 172   Jun) month=June; nummonth=6;;
 173   Jul) month=July; nummonth=7;;
 174   Aug) month=August; nummonth=8;;
 175   Sep) month=September; nummonth=9;;
 176   Oct) month=October; nummonth=10;;
 177   Nov) month=November; nummonth=11;;
 178   Dec) month=December; nummonth=12;;
 179 esac
 180
 181 case $3 in
 182   ???*) day=$1;;
 183   *) day=$3; shift;;
 184 esac
 185
 186 # Here we have to deal with the problem that the ls output gives either
 187 # the time of day or the year.
 188 case $3 in
 189   *:*) set `date`; eval year=\$$#
 190        case $2 in
 191          Jan) nummonthtod=1;;
 192          Feb) nummonthtod=2;;
 193          Mar) nummonthtod=3;;
 194          Apr) nummonthtod=4;;
 195          May) nummonthtod=5;;
 196          Jun) nummonthtod=6;;
 197          Jul) nummonthtod=7;;
 198          Aug) nummonthtod=8;;
 199          Sep) nummonthtod=9;;
 200          Oct) nummonthtod=10;;
 201          Nov) nummonthtod=11;;
 202          Dec) nummonthtod=12;;
 203        esac
 204        # For the first six month of the year the time notation can also
 205        # be used for files modified in the last year.
 206        if (expr $nummonth \> $nummonthtod) > /dev/null;
 207        then
 208          year=`expr $year - 1`
 209        fi;;
 210   *) year=$3;;
 211 esac
 212
 213 # The result.
 214 echo $day $month $year
 215
 216 # Local Variables:
 217 # mode: shell-script
 218 # sh-indentation: 2
 219 # eval: (add-hook 'write-file-hooks 'time-stamp)
 220 # time-stamp-start: "scriptversion="
 221 # time-stamp-format: "%:y-%02m-%02d.%02H"
 222 # time-stamp-time-zone: "UTC0"
 223 # time-stamp-end: "; # UTC"
 224 # End: