test-svn-fe: split off "test-svn-fe -d" into a separate function

The helper for testing the svndiff library is getting dangerously
close to the right margin.  Split it off into a separate function so
it is easier to contemplate on its own.

In the process, make the test_svnfe_usage[] string static so it can be
shared by the two functions (and other future functions in this test
program) without fuss.

In other words, this just unindents the code a little.  No functional
change intended.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>

diff --git a/test-svn-fe.c b/test-svn-fe.c
index 66bd04022dab32e894c5e6ca18702b69ad0a0ed0..a0276260eb15f9f7bb7fbafb4447a1cc7c84718d 100644 (file)
--- a/test-svn-fe.c
+++ b/test-svn-fe.c
@@ -8,10 +8,37 @@
 #include "vcs-svn/sliding_window.h"
 #include "vcs-svn/line_buffer.h"
 
+static const char test_svnfe_usage[] =
+       "test-svn-fe (<dumpfile> | [-d] <preimage> <delta> <len>)";
+
+static int apply_delta(int argc, char *argv[])
+{
+       struct line_buffer preimage = LINE_BUFFER_INIT;
+       struct line_buffer delta = LINE_BUFFER_INIT;
+       struct sliding_view preimage_view = SLIDING_VIEW_INIT(&preimage);
+
+       if (argc != 5)
+               usage(test_svnfe_usage);
+
+       if (buffer_init(&preimage, argv[2]))
+               die_errno("cannot open preimage");
+       if (buffer_init(&delta, argv[3]))
+               die_errno("cannot open delta");
+       if (svndiff0_apply(&delta, (off_t) strtoull(argv[4], NULL, 0),
+                                       &preimage_view, stdout))
+               return 1;
+       if (buffer_deinit(&preimage))
+               die_errno("cannot close preimage");
+       if (buffer_deinit(&delta))
+               die_errno("cannot close delta");
+       buffer_reset(&preimage);
+       strbuf_release(&preimage_view.buf);
+       buffer_reset(&delta);
+       return 0;
+}
+
 int main(int argc, char *argv[])
 {
-       static const char test_svnfe_usage[] =
-               "test-svn-fe (<dumpfile> | [-d] <preimage> <delta> <len>)";
        if (argc == 2) {
                if (svndump_init(argv[1]))
                        return 1;
@@ -20,25 +47,8 @@ int main(int argc, char *argv[])
                svndump_reset();
                return 0;
        }
-       if (argc == 5 && !strcmp(argv[1], "-d")) {
-               struct line_buffer preimage = LINE_BUFFER_INIT;
-               struct line_buffer delta = LINE_BUFFER_INIT;
-               struct sliding_view preimage_view = SLIDING_VIEW_INIT(&preimage);
-               if (buffer_init(&preimage, argv[2]))
-                       die_errno("cannot open preimage");
-               if (buffer_init(&delta, argv[3]))
-                       die_errno("cannot open delta");
-               if (svndiff0_apply(&delta, (off_t) strtoull(argv[4], NULL, 0),
-                                       &preimage_view, stdout))
-                       return 1;
-               if (buffer_deinit(&preimage))
-                       die_errno("cannot close preimage");
-               if (buffer_deinit(&delta))
-                       die_errno("cannot close delta");
-               buffer_reset(&preimage);
-               strbuf_release(&preimage_view.buf);
-               buffer_reset(&delta);
-               return 0;
-       }
+
+       if (argc >= 2 && !strcmp(argv[1], "-d"))
+               return apply_delta(argc, argv);
        usage(test_svnfe_usage);
 }