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Optimize empty substring case of scm_i_substring_copy

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* libguile/strings.c (scm_i_substring_copy): When asked to create an
  empty substring, use 'scm_i_make_string' to make use of its
  optimization for empty strings that reuses the global null_stringbuf.
This commit is contained in:
Mark H Weaver 2012-02-08 15:29:10 -05:00
parent d6cb0203cb
commit d5b75b6c80
1 changed files with 27 additions and 22 deletions
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5
libguile/strings.c
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@ -371,6 +371,10 @@ scm_i_substring_read_only (SCM str, size_t start, size_t end)
SCM SCM
scm_i_substring_copy (SCM str, size_t start, size_t end) scm_i_substring_copy (SCM str, size_t start, size_t end)
{
if (start == end)
return scm_i_make_string (0, NULL, 0);
else
{ {
size_t len = end - start; size_t len = end - start;
SCM buf, my_buf, substr; SCM buf, my_buf, substr;
@ -398,6 +402,7 @@ scm_i_substring_copy (SCM str, size_t start, size_t end)
scm_i_try_narrow_string (substr); scm_i_try_narrow_string (substr);
return substr; return substr;
} }
}
SCM SCM
scm_i_substring_shared (SCM str, size_t start, size_t end) scm_i_substring_shared (SCM str, size_t start, size_t end)