1 | ;# pwd.pl - keeps track of current working directory in PWD environment var
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2 | ;#
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3 | #
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4 | # This library is no longer being maintained, and is included for backward
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5 | # compatibility with Perl 4 programs which may require it.
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6 | #
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7 | # In particular, this should not be used as an example of modern Perl
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8 | # programming techniques.
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9 | #
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10 | # Suggested alternative: Cwd
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11 | #
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12 | ;# $RCSfile: pwd.pl,v $$Revision: 4.1 $$Date: 92/08/07 18:24:11 $
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13 | ;#
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14 | ;# $Log: pwd.pl,v $
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15 | ;#
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16 | ;# Usage:
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17 | ;# require "pwd.pl";
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18 | ;# &initpwd;
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19 | ;# ...
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20 | ;# &chdir($newdir);
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21 |
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22 | package pwd;
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23 |
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24 | sub main'initpwd {
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25 | if ($ENV{'PWD'}) {
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26 | local($dd,$di) = stat('.');
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27 | local($pd,$pi) = stat($ENV{'PWD'});
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28 | if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) {
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29 | chop($ENV{'PWD'} = `pwd`);
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30 | }
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31 | }
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32 | else {
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33 | chop($ENV{'PWD'} = `pwd`);
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34 | }
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35 | if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|) {
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36 | local($pd,$pi) = stat($2);
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37 | local($dd,$di) = stat($1);
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38 | if (defined $pd and defined $dd and $di == $pi and $dd == $pd) {
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39 | $ENV{'PWD'}="$2$3";
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40 | }
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41 | }
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42 | }
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43 |
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44 | sub main'chdir {
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45 | local($newdir) = shift;
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46 | $newdir =~ s|/{2,}|/|g;
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47 | if (chdir $newdir) {
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48 | if ($newdir =~ m#^/#) {
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49 | $ENV{'PWD'} = $newdir;
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50 | }
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51 | else {
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52 | local(@curdir) = split(m#/#,$ENV{'PWD'});
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53 | @curdir = '' unless @curdir;
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54 | foreach $component (split(m#/#, $newdir)) {
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55 | next if $component eq '.';
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56 | pop(@curdir),next if $component eq '..';
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57 | push(@curdir,$component);
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58 | }
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59 | $ENV{'PWD'} = join('/',@curdir) || '/';
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60 | }
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61 | }
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62 | else {
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63 | 0;
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64 | }
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65 | }
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66 |
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67 | 1;
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