From bfc794de222760871c6c6de6bb923a0bf57ee166 Mon Sep 17 00:00:00 2001 From: "Arnold D. Robbins" Date: Mon, 1 Sep 2014 22:42:07 +0300 Subject: Minor improvement to substr(). --- builtin.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) (limited to 'builtin.c') diff --git a/builtin.c b/builtin.c index 0995fdf7..6e4a1b72 100644 --- a/builtin.c +++ b/builtin.c @@ -1759,7 +1759,14 @@ do_substr(int nargs) else if (do_lint == DO_LINT_INVALID && ! (d_length >= 0)) lintwarn(_("substr: length %g is not >= 0"), d_length); DEREF(t1); - return dupnode(Nnull_string); + /* + * Return explicit null string instead of doing + * dupnode(Nnull_string) so that if the result + * is checked with the combination of length() + * and lint, no error is reported about using + * an uninitialized value. Same thing later, too. + */ + return make_string("", 0); } if (do_lint) { if (double_to_int(d_length) != d_length) @@ -1813,7 +1820,7 @@ do_substr(int nargs) if (do_lint && (do_lint == DO_LINT_ALL || ((indx | length) != 0))) lintwarn(_("substr: source string is zero length")); DEREF(t1); - return dupnode(Nnull_string); + return make_string("", 0); } /* get total len of input string, for following checks */ @@ -1830,7 +1837,7 @@ do_substr(int nargs) lintwarn(_("substr: start index %g is past end of string"), d_index); DEREF(t1); - return dupnode(Nnull_string); + return make_string("", 0); } if (length > src_len - indx) { if (do_lint) -- cgit v1.2.3