build/PrintPath

   1 #!/bin/sh
   2 # Look for program[s] somewhere in $PATH.
   3 #
   4 # Options:
   5 #  -s
   6 #    Do not print out full pathname. (silent)
   7 #  -pPATHNAME
   8 #    Look in PATHNAME instead of $PATH
   9 #
  10 # Usage:
  11 #  PrintPath [-s] [-pPATHNAME] program [program ...]
  12 #
  13 # Initially written by Jim Jagielski for the Apache configuration mechanism
  14 #  (with kudos to Kernighan/Pike)
  15 #
  16 # This script falls under the Apache License.
  17 # See http://www.apache.org/docs/LICENSE
  18
  19 ##
  20 # Some "constants"
  21 ##
  22 pathname=$PATH
  23 echo="yes"
  24
  25 ##
  26 # Find out what OS we are running for later on
  27 ##
  28 os=`(uname) 2>/dev/null`
  29
  30 ##
  31 # Parse command line
  32 ##
  33 for args in $*
  34 do
  35     case $args in
  36         -s  ) echo="no" ;;
  37         -p* ) pathname="`echo $args | sed 's/^..//'`" ;;
  38         *   ) programs="$programs $args" ;;
  39     esac
  40 done
  41
  42 ##
  43 # Now we make the adjustments required for OS/2 and everyone
  44 # else :)
  45 #
  46 # First of all, all OS/2 programs have the '.exe' extension.
  47 # Next, we adjust PATH (or what was given to us as PATH) to
  48 # be whitespace separated directories.
  49 # Finally, we try to determine the best flag to use for
  50 # test/[] to look for an executable file. OS/2 just has '-r'
  51 # but with other OSs, we do some funny stuff to check to see
  52 # if test/[] knows about -x, which is the preferred flag.
  53 ##
  54
  55 if [ "x$os" = "xOS/2" ]
  56 then
  57     ext=".exe"
  58     pathname=`echo -E $pathname |
  59      sed 's/^;/.;/
  60           s/;;/;.;/g
  61           s/;$/;./
  62           s/;/ /g
  63           s/\\\\/\\//g' `
  64     test_exec_flag="-r"
  65 else
  66     ext=""      # No default extensions
  67     pathname=`echo $pathname |
  68      sed 's/^:/.:/
  69           s/::/:.:/g
  70           s/:$/:./
  71           s/:/ /g' `
  72     # Here is how we test to see if test/[] can handle -x
  73     testfile="pp.t.$$"
  74
  75     cat > $testfile <<ENDTEST
  76 #!/bin/sh
  77 if [ -x / ] || [ -x /bin ] || [ -x /bin/ls ]; then
  78     exit 0
  79 fi
  80 exit 1
  81 ENDTEST
  82
  83     if `/bin/sh $testfile 2>/dev/null`; then
  84         test_exec_flag="-x"
  85     else
  86         test_exec_flag="-r"
  87     fi
  88     rm -f $testfile
  89 fi
  90
  91 for program in $programs
  92 do
  93     for path in $pathname
  94     do
  95         if [ $test_exec_flag $path/${program}${ext} ] && \
  96            [ ! -d $path/${program}${ext} ]; then
  97             if [ "x$echo" = "xyes" ]; then
  98                 echo $path/${program}${ext}
  99             fi
 100             exit 0
 101         fi
 102
 103 # Next try without extension (if one was used above)
 104         if [ "x$ext" != "x" ]; then
 105             if [ $test_exec_flag $path/${program} ] && \
 106                [ ! -d $path/${program} ]; then
 107                 if [ "x$echo" = "xyes" ]; then
 108                     echo $path/${program}
 109                 fi
 110                 exit 0
 111             fi
 112         fi
 113     done
 114 done
 115 exit 1
 116