t4209: use helper functions to test --grep

diff --git a/vcs-svn/svndiff.c b/vcs-svn/svndiff.c
index 1647c1a780c5a6153455fdc73b6e422b474dab8e..74c97c4543d1fa707961aab1453edfb69b2679d2 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;
@@ -258,6 +259,7 @@ static int apply_window_in_core(struct window *ctx)
 static int apply_one_window(struct line_buffer *delta, off_t *delta_len,
                            struct sliding_view *preimage, FILE *out)
 {
+       int rv = -1;
        struct window ctx = WINDOW_INIT(preimage);
        size_t out_len;
        size_t instructions_len;
@@ -275,27 +277,26 @@ static int apply_one_window(struct line_buffer *delta, off_t *delta_len,
        if (apply_window_in_core(&ctx))
                goto error_out;
        if (ctx.out.len != out_len) {
-               error("invalid delta: incorrect postimage length");
+               rv = error("invalid delta: incorrect postimage length");
                goto error_out;
        }
        if (write_strbuf(&ctx.out, out))
                goto error_out;
-       window_release(&ctx);
-       return 0;
+       rv = 0;
 error_out:
        window_release(&ctx);
-       return -1;
+       return rv;
 }
 
 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;
        while (delta_len) {     /* For each window: */
-               off_t pre_off = pre_off; /* stupid GCC... */
+               off_t pre_off = -1;
                size_t pre_len;
 
                if (read_offset(delta, &pre_off, &delta_len) ||