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

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* libguile/read.c (scm_read_string): Use `scm_i_make_read_only_string ()' to
  return a read-only string, as mandated by R5RS.  Reported by Bill
  Schottstaedt <bil@ccrma.Stanford.EDU>.

* libguile/strings.c (scm_i_make_read_only_string): New function.
  (scm_i_shared_substring_read_only): Special-case the empty string
  so that the read-only and read-write empty strings are `eq?'.  This
  optimization is relied on by the `substring/shared' `empty string'
  test case in `srfi-13.test'.

* libguile/strings.h (scm_i_make_read_only_string): New declaration.

* test-suite/tests/strings.test ("string-set!")["literal string"]: New test.

* NEWS: Update.
This commit is contained in:
Ludovic Courtès 2008-09-22 23:03:20 +02:00
parent 40de0323e7
commit be5c4a82ab
5 changed files with 38 additions and 13 deletions
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3
libguile/strings.h
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@ -3,7 +3,7 @@
#ifndef SCM_STRINGS_H
#define SCM_STRINGS_H
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2004, 2005, 2006 Free Software Foundation, Inc.
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2004, 2005, 2006, 2008 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
@ -152,6 +152,7 @@ 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 */