R6RS character hex escapes do not conflict with legacy Guile octal
character escapes, so they can be enabled by default.
* libguile/read.c (scm_read_character): modified
* test-suite/tests/reader.test: modify character escape tests
* doc/ref/api-data.texi: modified
* doc/ref/api-options.texi: modified
* libguile/read.c (scm_read_shebang): New function;
(scm_read_sharp): Call scm_read_shebang on '!', which delegates to
scm_read_scsh_block_comment as necessary.
* test-suite/tests/reader.test ("R6RS lexeme comment", "partial R6RS
lexeme comment"): New tests.
scm_to_stringn failed to do the necessary escape conversion for
R6RS hex escapes
* libguile/strings.c (unistring_escapes_to_r6rs_escapes): new function
(scm_to_stringn): use new function when r6rs hex escapes are enabled
* test-suite/tests/reader.test: new test for string display
* test-suite/tests/reader.test (r6rs-hex-escapes): new tests
* test-suite/tests/chars.test (R6RS Hex escapes): remove tests by reverting
to previous version
* test-suite/tests/strings.test (R6RS Hex escapes): remove tests by
reverting to previous version
* libguile/strports.c (scm_i_mkstrport): Remove.
(scm_mkstrport): Don't change the port's encoding to UTF-8; convert
STR to the default port encoding.
(scm_strport_to_string): Fix documentation & indentation.
* libguile/strports.h (scm_i_mkstrport): Remove.
* test-suite/lib.scm (exception:encoding-error): New variable.
(format-test-name): Set `%default-port-encoding' to "UTF-8".
* test-suite/tests/ports.test ("string ports")["%default-port-encoding
is honored", "suitable encoding [latin-1]", "suitable encoding
[latin-3]", "wrong encoding"]: New tests.
* test-suite/tests/r6rs-ports.test ("7.2.11 Binary
Output")["put-bytevector with UTF-16 string port", "put-bytevector
with wrong-encoding string port"]: New tests.
* test-suite/tests/reader.test (read-string): Set
`%default-port-encoding' to `#f'.
("reading")["unprintable symbol"]: Use a string that doesn't contain
zeros.
* doc/ref/api-io.texi (String Ports): Document encoding issues with
`call-with-output-string' and `with-output-to-string'.
* test-suite/tests/reader.test ("read-options"): Add test
for long postfix keywords.
* libguile/read.c (scm_read_mixed_case_symbol): Fix
exception on symbols are greater than 128 chars. Also,
colons are not stripped from long postfix keywords.
