Make 'diff_populate_filespec()' use the new 'strbuf_readlink()'

This makes all tests pass on a system where 'lstat()' has been hacked to
return bogus data in st_size for symlinks.

Of course, the test coverage isn't complete, but it's a good baseline.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diff.c b/diff.c
index afefe087bba00bc9ec98327a880fbefdcf44a1d1..4b2029caa1c4a33154716ead5c385639f4b3f856 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -1773,19 +1773,17 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
                s->size = xsize_t(st.st_size);
                if (!s->size)
                        goto empty;
-               if (size_only)
-                       return 0;
                if (S_ISLNK(st.st_mode)) {
-                       int ret;
-                       s->data = xmalloc(s->size);
-                       s->should_free = 1;
-                       ret = readlink(s->path, s->data, s->size);
-                       if (ret < 0) {
-                               free(s->data);
+                       struct strbuf sb = STRBUF_INIT;
+
+                       if (strbuf_readlink(&sb, s->path, s->size))
                                goto err_empty;
-                       }
+                       s->data = strbuf_detach(&sb, &s->size);
+                       s->should_free = 1;
                        return 0;
                }
+               if (size_only)
+                       return 0;
                fd = open(s->path, O_RDONLY);
                if (fd < 0)
                        goto err_empty;