# sed_quote separator string
# Prefixes occurences of sed special characters and separator with \ in string.
# Suggested separators: , / (space) .
# Note that the character is prefixed with \ so characters that get special meaning
# will not work as separator. eg: n \ ? ( { ) }
sed_quote()
{
        echo -n "$2" | sed -e 's/\n/\\n/' -e 's|\([][*.$|'"$1"']\)|\\\1|g'
}

# Include a module dynamically loaded by a library
# $1 - directory to search for the library (may be / to search all of initramfs)
#      directory should start with /
# $2 - library to search for
# $3 - module to include relative to library found

# example: lib_module /lib 'libc.so.*' 'libnss_dns.so.*'
#          lib_module /usr/lib 'libpango-*.so.*' 'pango/*/modules/pango-basic-fc.so'

# Does not handle whitespace in module names.

# When the library is located in a directory including newline in the path the
# module may not be found or a module in a different directory might be used.
# This is a limitation of shellutils; find has -print0 but the output is non-processable.

# The read option -r should prevent expansion of \ in read module paths.
# The IFS="" should prevent splitting of whitespace in module paths.

# Works with bash and dash, posh can't execute this script because it cannot glob partially
# quoted strings.
lib_module()
{
        local dir lib mod lib_dir i j dest_quoted
        # Shell (possibly) special characters: * ? (space) \ ; $ { } [ ] ( ) & | < > (tab) (newline)
        # Out of these * ? are allowed, \ ; $ {} [] () <> & | is not re-expanded in variable substitution.
        # (space) (tab) (newline) delimit words and to allow * ? to be expanded these are not supported.
        # sed special characters: * \ . $ ^ [ ] | (newline) (character used as separator in s command)
        dir="$1"
        lib="$2"
        mod="$3"
        if echo -n "$mod" | LC_CTYPE=C grep "[[:space:]]" >&2 ; then # space tab newline, possibly vtab and cr
                echo lib_module: module name contains whitespace. >&2
                return 1
        fi
        dest_quoted="$(sed_quote " " "${DESTDIR}")"
        { find "${DESTDIR}${dir}" -name "${lib}" -type l
          find "${DESTDIR}${dir}" -name "${lib}" -type f ; } | { while IFS="" read -r i ;  do
                lib_dir="$(dirname "$i" | sed -e "s ^${dest_quoted}  " )"
                ls "${lib_dir}"/${mod} | { while IFS="" read -r j ; do
                        copy_exec "$j" | :
                done ; }
        done ; }
}