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# Generate an exported symbols list out of a map file (as use on Linux/Solaris) in order to
# build shared libraries on Mac OS X
#
# The below code fails may fail with 'perverted' mapfiles (using a strange line layout etc.)

# Skip 'SECTION_NAME {' lines
/^[\t ]*.*[\t ]*\{/ { next }

# Skip 'global:' or 'local:' lines
/global:/ || /local:/ { next }

# Skip '*;' lines
/^[\t ]*\*;[\t ]*/ { next }

# Skip section end '}?;' lines
/^[\t ]*\}[\t ]*.*[;]*/ { next }

# Skip comment or empty lines
/^[\t ]*#.*/ || /^[\t ]*$/ || /^$/ { next }

# Echo all lines containing symbol names and prefix them with '_'
# because symbols on Mac OS X start always with '__'
{
    # There may appear multiple symbols in one line
    # e.g. "sym1; sym2; # and finally a comment"
    # take this into account
    for (i = 1; i <= NF ; i++) {
	if ($i !~ /^[\t ]*#.*/) { # as long as the current field doesn't start with '#'
	    gsub(/[\t ;]/, "", $i) # Remove leading spaces and trailing ';'
	    printf("_%s\n",$i)
	}
	else { # ignore everything after a '#' (comment) sign
	    break
	}
    }
}