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authorLudovic Courtès <ludo@gnu.org>2008-09-22 23:03:20 +0200
committerLudovic Courtès <ludo@gnu.org>2008-09-23 18:45:27 +0200
commitfb2f8886c4d537b0c7d3e9e78a8d4e5e272a36f4 (patch)
tree16d6bbddb4c7ef0078f727dfb991e23fda94a79a /libguile/strings.h
parentfd2b17b9cb7aaa6b550ad9b6a3efe3c53c94ccce (diff)
downloadguile-fb2f8886c4d537b0c7d3e9e78a8d4e5e272a36f4.tar.gz
Make literal strings (i.e., returned by `read') read-only.
* 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.
Diffstat (limited to 'libguile/strings.h')
-rw-r--r--libguile/strings.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libguile/strings.h b/libguile/strings.h
index ca5f52cd2..cf5862803 100644
--- a/libguile/strings.h
+++ b/libguile/strings.h
@@ -152,6 +152,7 @@ SCM_INTERNAL void scm_i_get_substring_spec (size_t len,
SCM start, size_t *cstart,
SCM end, size_t *cend);
SCM_INTERNAL SCM scm_i_take_stringbufn (char *str, size_t len);
+SCM_INTERNAL SCM scm_i_make_read_only_string (SCM str);
/* deprecated stuff */