[PATCH v2 0/1] vreportf: Fix interleaving issues, remove 4096 limitation

This fixes t5516 on Windows. For detailed explanation please refer to code comments in this commit.

There was a lot of back-and-forth already in vreportf(): d048a96e (2007-11-09) - 'char msg[256]' is introduced to avoid interleaving 389d1767 (2009-03-25) - Buffer size increased to 1024 to avoid truncation 625a860c (2009-11-22) - Buffer size increased to 4096 to avoid truncation f4c3edc0 (2015-08-11) - Buffer removed to avoid truncation b5a9e435 (2017-01-11) - Reverts f4c3edc0 to be able to replace control chars before sending to stderr

This fix attempts to solve all issues:

1) avoid multiple fprintf() interleaving 2) avoid truncation 3) avoid char
interleaving in fprintf() on some platforms 4) avoid buffer block
interleaving when output is large 5) avoid Out-of-order messages 6) replace
control characters in output

Other commits worthy of notice: 9ac13ec9 (2006-10-11) - Another attempt to solve interleaving. This is seemingly related to d048a96e. 137a0d0e (2007-11-19) - Addresses out-of-order for display() 34df8aba (2009-03-10) - Switches xwrite() to fprintf() in recv_sideband() to support UTF-8 emulation eac14f89 (2012-01-14) - Removes the need for fprintf() for UTF-8 emulation, so it's safe to use xwrite() again 5e5be9e2 (2016-06-28) - recv_sideband() uses xwrite() again

Signed-off-by: Alexandr Miloslavskiy alexandr.miloslavskiy@syntevo.com
[alexandr.miloslavskiy@syntevo.com]

Alexandr Miloslavskiy (1):
  vreportf: Fix interleaving issues, remove 4096 limitation

 usage.c | 154 +++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 148 insertions(+), 6 deletions(-)

base-commit: d966095db01190a2196e31195ea6fa0c722aa732
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-407%2FSyntevoAlex%2F%230194_t5516_fixes-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-407/SyntevoAlex/#0194_t5516_fixes-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/407

Range-diff vs v1:

 1:  5fd06fa881 ! 1:  54f0d6f6b5 vreportf: Fix interleaving issues, remove 4096 limitation
     @@ -23,12 +23,12 @@
      
          Other commits worthy of notice:
          9ac13ec9 (2006-10-11) - Another attempt to solve interleaving.
     -                                                    This is seemingly related to d048a96e.
     +                            This is seemingly related to d048a96e.
          137a0d0e (2007-11-19) - Addresses out-of-order for display()
          34df8aba (2009-03-10) - Switches xwrite() to fprintf() in recv_sideband()
     -                                                    to support UTF-8 emulation
     +                            to support UTF-8 emulation
          eac14f89 (2012-01-14) - Removes the need for fprintf() for UTF-8 emulation,
     -                                                    so it's safe to use xwrite() again
     +                            so it's safe to use xwrite() again
          5e5be9e2 (2016-06-28) - recv_sideband() uses xwrite() again
      
          Signed-off-by: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>