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Revert "Make literal strings (i.e., returned by `read') read-only."

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This reverts commit be5c4a82ab.

The rationale is that `read' must return mutable strings, as reported
by szgyg <szgyg@ludens.elte.hu>.
This commit is contained in:
Ludovic Courtès 2008-10-09 23:23:27 +02:00
parent 097158c936
commit 4b600701b9
5 changed files with 13 additions and 38 deletions
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1
NEWS
View file

@ -27,7 +27,6 @@ available: Guile is now always configured in "maintainer mode".
* Bugs fixed
** `symbol->string' now returns a read-only string, as per R5RS
** Literal strings as returned by `read' are now read-only, as per R5RS
** Fix incorrect handling of the FLAGS argument of `fold-matches'
** `guile-config link' now prints `-L$libdir' before `-lguile'
** Fix memory corruption involving GOOPS' `class-redefinition'

2
libguile/read.c
View file

@ -514,7 +514,7 @@ scm_read_string (int chr, SCM port)
else
str = (str == SCM_BOOL_F) ? scm_nullstr : str;
return scm_i_make_read_only_string (str);
return str;
}
#undef FUNC_NAME

21
libguile/strings.c
View file

@ -217,12 +217,6 @@ get_str_buf_start (SCM *str, SCM *buf, size_t *start)
*buf = STRING_STRINGBUF (*str);
}
SCM
scm_i_make_read_only_string (SCM str)
{
return scm_i_substring_read_only (str, 0, STRING_LENGTH (str));
}
SCM
scm_i_substring (SCM str, size_t start, size_t end)
{
@ -239,31 +233,18 @@ scm_i_substring (SCM str, size_t start, size_t end)
SCM
scm_i_substring_read_only (SCM str, size_t start, size_t end)
{
SCM result;
if (SCM_UNLIKELY (STRING_LENGTH (str) == 0))
/* We want the empty string to be `eq?' with the read-only empty
string. */
result = str;
else
{
SCM buf;
size_t str_start;
get_str_buf_start (&str, &buf, &str_start);
scm_i_pthread_mutex_lock (&stringbuf_write_mutex);
SET_STRINGBUF_SHARED (buf);
scm_i_pthread_mutex_unlock (&stringbuf_write_mutex);
result = scm_double_cell (RO_STRING_TAG, SCM_UNPACK (buf),
return scm_double_cell (RO_STRING_TAG, SCM_UNPACK(buf),
(scm_t_bits)str_start + start,
(scm_t_bits) end - start);
}
return result;
}
SCM
scm_i_substring_copy (SCM str, size_t start, size_t end)
{

3
libguile/strings.h
View file

@ -3,7 +3,7 @@
#ifndef SCM_STRINGS_H
#define SCM_STRINGS_H
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2004, 2005, 2006, 2008 Free Software Foundation, Inc.
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2004, 2005, 2006 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -152,7 +152,6 @@ SCM_API void scm_i_get_substring_spec (size_t len,
SCM start, size_t *cstart,
SCM end, size_t *cend);
SCM_API SCM scm_i_take_stringbufn (char *str, size_t len);
SCM_API SCM scm_i_make_read_only_string (SCM str);
/* deprecated stuff */

8
test-suite/tests/strings.test
View file

@ -1,7 +1,7 @@
;;;; strings.test --- test suite for Guile's string functions -*- scheme -*-
;;;; Jim Blandy <jimb@red-bean.com> --- August 1999
;;;;
;;;; Copyright (C) 1999, 2001, 2004, 2005, 2006, 2008 Free Software Foundation, Inc.
;;;; Copyright (C) 1999, 2001, 2004, 2005, 2006 Free Software Foundation, Inc.
;;;;
;;;; This program is free software; you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
@ -168,11 +168,7 @@
(pass-if-exception "read-only string"
exception:read-only-string
(string-set! (substring/read-only "abc" 0) 1 #\space))
(pass-if-exception "literal string"
exception:read-only-string
(string-set! "an immutable string" 0 #\a)))
(string-set! (substring/read-only "abc" 0) 1 #\space)))
(with-test-prefix "string-split"