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Full Discussion: [BASH - KSH] Passing array to a function
Top Forums Shell Programming and Scripting [BASH - KSH] Passing array to a function Post 302186432 by ripat on Thursday 17th of April 2008 08:17:38 AM
Old 04-17-2008
Boy, this one wasn't easy!

OK, here is what works in bash. Remember, the question was to pass an array to a function and make sure that whatever is done by the function remains local. If the local scope isn't necessary, just remove the "local" declaration.
Code:
#!/bin/bash

function print_array {
    # Setting the shell's Internal Field Separator to null
    OLD_IFS=$IFS
    IFS=''

    # Create a string containing "colors[*]"
    local array_string="$1[*]"

    # assign loc_array value to ${colors[*]} using indirect variable reference
    local loc_array=(${!array_string})

    # Resetting IFS to default
    IFS=$OLD_IFS

    # Checking the second element "Light Gray" (the one with a space)
    echo ${loc_array[1]}
    
}

# create an array and display contents
colors=('Pink' 'Light Gray' 'Green')
echo ${colors[*]}

# call function with positional parameter $1 set to array's name
print_array colors 

# checking whether the function "local" loc_array is visible here
echo "Does the local array exist here? -->${loc_array[*]}<--"
exit 0

This returns:
Code:
Pink Light Gray Green
Light Gray
Does the local array exist here? --><--

We can also "copy" an array the same way: setting IFS to NULL permit to do variable expansion that preserves the possible spaces in array's elements.
Code:
colors=('Pink' 'Light Gray' 'Green')
OLD_IFS=$IFS
IFS=''
copy_colors=(${colors[*]})
IFS=$OLD_IFS

echo ${copy_colors[*]}
echo ${copy_colors[1]}

Last edited by ripat; 04-18-2008 at 03:35 AM..
 

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LEARN ABOUT NETBSD

desktop_palette

desktop_palette(3alleg4)					  Allegro manual					  desktop_palette(3alleg4)

NAME

       desktop_palette - The palette used by the Atari ST low resolution desktop. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       extern PALETTE desktop_palette;

DESCRIPTION

       The  palette  used by the Atari ST low resolution desktop. I'm not quite sure why this is still here, except that the grabber and test pro-
       grams use it. It is probably the only Atari legacy code left in Allegro, and it would be a shame to remove it :-)

       The contents of this palette are 16 colors repeated 16 times. Color entry zero is equal to color entry 16, which is equal  to  color  entry
       24, etc.

	  Index      Color	 RGB values
	    0	  White 	 63  63  63
	    1	  Red		 63   0   0
	    2	  Green 	  0  63   0
	    3	  Yellow	 63  63   0
	    4	  Blue		  0   0  63
	    5	  Pink		 63   0  63
	    6	  Cyan		  0  63  63
	    7	  Grey		 16  16  16
	    8	  Light grey	 31  31  31
	    9	  Light red	 63  31  31
	   10	  Light green	 31  63  31
	   11	  Light yellow	 63  63  31
	   12	  Light blue	 31  31  63
	   13	  Light pink	 63  31  63
	   14	  Light cyan	 31  63  63
	   15	  Black 	  0   0   0

SEE ALSO

       default_palette(3alleg4), black_palette(3alleg4)

Allegro 							   version 4.4.2					  desktop_palette(3alleg4)
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