vcs-svn: suppress a signed/unsigned comparison warning

All callers pass a nonnegative delta_len, so the code is already safe.
Add an assertion to ensure that remains so and add a cast to keep
clang and gcc -Wsign-compare from worrying.

Reported-by: David Barr <davidbarr@google.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>

diff --git a/vcs-svn/svndiff.c b/vcs-svn/svndiff.c
index e810d0c..74c97c4 100644 (file)
--- a/vcs-svn/svndiff.c
+++ b/vcs-svn/svndiff.c
@@ -77,8 +77,9 @@ static int error_short_read(struct line_buffer *input)
 static int read_chunk(struct line_buffer *delta, off_t *delta_len,
                      struct strbuf *buf, size_t len)
 {
+       assert(*delta_len >= 0);
        strbuf_reset(buf);
-       if (len > *delta_len ||
+       if (len > (uintmax_t) *delta_len ||
            buffer_read_binary(delta, buf, len) != len)
                return error_short_read(delta);
        *delta_len -= buf->len;
@@ -290,7 +291,7 @@ error_out:
 int svndiff0_apply(struct line_buffer *delta, off_t delta_len,
                        struct sliding_view *preimage, FILE *postimage)
 {
-       assert(delta && preimage && postimage);
+       assert(delta && preimage && postimage && delta_len >= 0);
 
        if (read_magic(delta, &delta_len))
                return -1;