charset.exp

这个是LINUX下的GDB调度工具的源码

        } else {
            fail "check effect of `set host-charset $host_charset'"
        }

        # Now try setting every possible target character set,
        # given that host charset.
        foreach target_charset [all_charset_names] {
            set testname "try `set target-charset $target_charset'"
            send_gdb "set target-charset $target_charset\n"
            gdb_expect {
                -re "GDB doesn't know of any character set named.*\[\r\n]+${gdb_prompt} $" {
                    fail "$testname (didn't recognize name)"
                }
                -re "GDB can't convert from the .* character set to .*\\.\[\r\n\]+${gdb_prompt} $" {
                    # This is a serious problem.  GDB should be able to convert
                    # between any arbitrary pair of character sets.
                    fail "$testname (can't convert)"
                }
                -re "${gdb_prompt} $" {
                    pass $testname
                }
                timeout {
                    fail "$testname (timeout)"
                }
            }

            # Check that the command actually had its intended effect:
            # $target_charset should now be the target charset.
            send_gdb "show charset\n"
            set result [parse_show_charset_output "parse `show charset' after `set target-charset $target_charset'"]
            if {! [string compare $result [list $host_charset $target_charset]]} {
                pass "check effect of `set target-charset $target_charset'"
            } else {
                fail "check effect of `set target-charset $target_charset'"
            }

            # Test handling of characters in the host charset which
            # can't be translated into the target charset.  \xA2 is
            # `cent' in ISO-8859-1, which has no equivalent in ASCII.
            #
            # On some systems, the pseudo-tty through which we
            # communicate with GDB insists on stripping the high bit
            # from input characters, meaning that `cent' turns into
            # `"'.  Since ISO-8859-1 and ASCII are identical in the
            # lower 128 characters, it's tough to see how we can test
            # this behavior on such systems, so we just xfail it.
	    #
	    # Note: the \x16 (Control-V) is an escape to allow \xA2 to
	    # get past readline.
            if {! [string compare $host_charset iso-8859-1] && ! [string compare $target_charset ascii]} {

                set testname "untranslatable character in character literal"
                send_gdb "print '\x16\xA2'\n"
                gdb_expect {
                    -re "There is no character corresponding to .* in the target character set .*\\.\[\r\n\]+$gdb_prompt $" {
                        pass $testname
                    }
                    -re " = 34 '\"'\[\r\n\]+$gdb_prompt $" {
                        xfail "$testname (DejaGNU's pseudo-tty strips eighth bit)"
                    }
                    -re "$gdb_prompt $" {
                        fail $testname
                    }
                    timeout {
                        fail "$testname (timeout)"
                    }
                }

                set testname "untranslatable character in string literal"
                # If the PTTY zeros bit seven, then this turns into
                #   print """
                # which gets us a syntax error.  We don't care.
                send_gdb "print \"\x16\xA2\"\n"
                gdb_expect {
                    -re "There is no character corresponding to .* in the target character set .*\\.\[\r\n\]+$gdb_prompt $" {
                        pass $testname
                    }
                    -re "Unterminated string in expression.\[\r\n\]+$gdb_prompt $" {
                        xfail "$testname (DejaGNU's pseudo-tty strips eighth bit)"
                    }
                    -re "$gdb_prompt $" {
                        fail $testname
                    }
                    timeout {
                        fail "$testname (timeout)"
                    }
                }

                set testname "untranslatable characters in backslash escape"
                send_gdb "print '\\\x16\xA2'\n"
                gdb_expect {
                    -re "The escape sequence .* is equivalent to plain .*, which has no equivalent\[\r\n\]+in the .* character set\\.\[\r\n\]+$gdb_prompt $" {
                        pass $testname
                    }
                    -re " = 34 '\"'\[\r\n\]+$gdb_prompt $" {
                        xfail "$testname (DejaGNU's pseudo-tty strips eighth bit)"
                    }
                    -re "$gdb_prompt $" {
                        fail $testname
                    }
                    timeout {
                        fail "$testname (timeout)"
                    }
                }
            }
        }
    }
}


# Set the host character set to plain ASCII, and try actually printing
# some strings in various target character sets.  We need to run the
# test program to the point at which the strings have been
# initialized.
gdb_test "break [gdb_get_line_number "all strings initialized"]" \
         ".*Breakpoint.* at .*" \
         "set breakpoint after all strings have been initialized"
gdb_run_cmd
gdb_expect {
    -re "Breakpoint.*all strings initialized.*$gdb_prompt $" {
        pass "run until all strings have been initialized"
    }
    -re "$gdb_prompt $" {
        fail "run until all strings have been initialized"
    }
    timeout {
        fail "run until all strings have been initialized (timeout)"
    }
}


gdb_test "set host-charset ASCII" ""
foreach target_charset [all_charset_names] {
    send_gdb "set target-charset $target_charset\n" 
    gdb_expect {
        -re "$gdb_prompt $" {
            pass "set target-charset $target_charset"
        }
        timeout {
            fail "set target-charset $target_charset (timeout)"
        }
    }

    # Try printing the null character.  There seems to be a bug in
    # gdb_test that requires us to use gdb_expect here.
    send_gdb "print '\\0'\n"
    gdb_expect {
        -re "\\\$${decimal} = 0 '\\\\0'\[\r\n\]+$gdb_prompt $" {
            pass "print the null character in ${target_charset}"
        }
        -re "$gdb_prompt $" {
            fail "print the null character in ${target_charset}"
        }
        timeout {
            fail "print the null character in ${target_charset} (timeout)"
        }
    }

    # Compute the name of the variable in the test program that holds
    # a string in $target_charset.  The variable's name is the
    # character set's name, in lower-case, with all non-identifier
    # characters replaced with '_', with "_string" stuck on the end.
    set var_name [string tolower "${target_charset}_string"]
    regsub -all -- "\[^a-z0-9_\]" $var_name "_" var_name
    
    # Compute a regexp matching the results we expect.  This is static,
    # but it's easier than writing it out.
    regsub -all "." "abfnrtv" "(\\\\&|x)" escapes
    set uppercase "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    set lowercase "abcdefghijklmnopqrstuvwxyz"
    set digits "0123456789"
    set octal_escape "\\\\\[0-9\]\[0-9\]\[0-9\]"

    send_gdb "print $var_name\n"
    # ${escapes}${uppercase}${lowercase}${digits}${octal}${octal}
    gdb_expect {
        -re ".* = \"(\\\\a|x)(\\\\b|x)(\\\\f|x)(\\\\n|x)(\\\\r|x)(\\\\t|x)(\\\\v|x)${uppercase}${lowercase}${digits}(\\\\\[0-9\]\[0-9\]\[0-9\]|x)(\\\\\[0-9\]\[0-9\]\[0-9\]|x).*\"\[\r\n\]+$gdb_prompt $" {
            pass "print string in $target_charset"
        }
        -re "$gdb_prompt $" {
            fail "print string in $target_charset"
        }
        timeout {
            fail "print string in $target_charset (timeout)"
        }
    }

    # Try entering a character literal, and see if it comes back unchanged.
    gdb_test "print 'A'" \
             " = \[0-9-\]+ 'A'" \
             "parse character literal in ${target_charset}"

    # Check that the character literal was encoded correctly.
    gdb_test "print 'A' == $var_name\[7\]" \
             " = 1" \
             "check value of parsed character literal in ${target_charset}"

    # Try entering a string literal, and see if it comes back unchanged.
    gdb_test "print \"abcdefABCDEF012345\"" \
             " = \"abcdefABCDEF012345\"" \
             "parse string literal in ${target_charset}"

    # Check that the string literal was encoded correctly.
    gdb_test "print \"q\"\[0\] == $var_name\[49\]" \
             " = 1" \
             "check value of parsed string literal in ${target_charset}"

    # Test handling of characters in the target charset which
    # can't be translated into the host charset.
    if {! [string compare $target_charset iso-8859-1]} {
        gdb_test "print iso_8859_1_string\[69\]" \
                 " = \[0-9-\]+ '\\\\242'" \
                 "print character with no equivalent in host character set"
        gdb_test "print iso_8859_1_string + 70" \
                 " = ${hex} \"\\\\242.*\"" \
                 "print string with no equivalent in host character set"
    }

    # Make sure that we don't apply the ISO-8859-1 `print_literally'
    # function to ASCII.
    if {! [string compare $target_charset ascii]} {
        gdb_test "print iso_8859_1_string\[69\]" \
                 " = \[0-9-\]+ '\\\\242'" \
                 "print ASCII unprintable character"
        gdb_test "print iso_8859_1_string + 70" \
                 " = ${hex} \"\\\\242.*\"" \
                 "print ASCII unprintable string"
    }

    # Try printing characters with backslash escape equivalents.
    set escapees {a b f n r t v}
    for {set i 0} {$i < [llength $escapees]} {incr i} {
        set escape [lindex $escapees $i]
        send_gdb "print $var_name\[$i\]\n"
        set have_escape 1
        gdb_expect {
            -re "= \[0-9-\]+ '\\\\${escape}'\[\r\n\]+$gdb_prompt $" {
                pass "try printing '\\${escape}' in ${target_charset}"
            }
            -re "= \[0-9-\]+ 'x'\[\r\n\]+$gdb_prompt $" {
                xfail "try printing '\\${escape}' in ${target_charset} (no such escape)"
                set have_escape 0
            }
            -re "$gdb_prompt $" {
                fail "try printing '\\${escape}' in ${target_charset}"
            }
            timeout {
                fail "try printing '\\${escape}' in ${target_charset} (timeout)"
            }
        }

        if {$have_escape} {

            # Try parsing a backslash escape in a character literal.
            gdb_test "print '\\${escape}' == $var_name\[$i\]" \
                     " = 1" \
                     "check value of '\\${escape}' in ${target_charset}"

            # Try parsing a backslash escape in a string literal.
            gdb_test "print \"\\${escape}\"\[0\] == $var_name\[$i\]" \
                     " = 1" \
                     "check value of \"\\${escape}\" in ${target_charset}"
        }
    }

    # Try printing a character escape that doesn't exist.  We should 
    # get the unescaped character, in the target character set.
    gdb_test "print '\\q'" " = \[0-9-\]+ 'q'" \
             "print escape that doesn't exist in $target_charset"
    gdb_test "print '\\q' == $var_name\[49\]" " = 1" \
             "check value of escape that doesn't exist in $target_charset"
}

gdb_exit