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Re: [PATCH v2 1/3] Introduce die_errno() that appends strerror(errno) to die()

From
Jeff King <peff@peff.net>
Date
Jun 8, 2009, 22:04 UTC
Message-ID
<20090608220423.GA29942@sigill.intra.peff.net>
In-Reply-To
<2325a7950906080835h6d6d2d28j2c7261f2296a3da6@mail.gmail.com>
On Mon, Jun 08, 2009 at 07:35:55PM +0400, Alexander Potashev wrote:
Show 10 quoted lines
> > More than that, you must support arbitrary printf format strings,
> > because the die routine is passed whatever goes to die() (a quick grep
> > revealed that we use at least %u and %c at various points). So it is an
> > undocumented requirement that the die routine process its parameters as
> > if it were from the printf family.
> 
> Your last statement is not quite true. A custom die routine may
> support all printf specifiers and some additional ones, but Thomas'
> die_errno passes the format string (and arguments list) to vsnprintf
> anyway, so the additional specifiers would be lost.

But if die() is called (_not_ die_errno), then the format is passed unchanged. So what I am saying is that anyone supplying a die_routine _already_ has to handle all printf format specifiers. So asking them to handle just "%s" via die_errno is not introducing any additional requirements.

-Peff
Previous: Alexander PotashevNext: Alexander Potashev
Message 26 of 28 in “add strerror(errno) to die() calls where applicable”
  1. add strerror(errno) to die() calls where applicableThomas Rast, Jun 2, 2009
  2. Jeff KingJun 3, 2009
  3. diesys calls die and also reports strerror(errno)Alexander Potashev, Jun 4, 2009
  4. Jeff KingJun 4, 2009
  5. Junio C HamanoJun 4, 2009
  6. Johannes SixtJun 5, 2009
  7. Junio C HamanoJun 5, 2009
  8. Jeff KingJun 6, 2009
  9. Thomas RastJun 6, 2009
  10. 0/3 Thomas Rast <trast@student.ethz.ch>Thomas Rast, Jun 6, 2009
  11. 1/3 Introduce die_errno() that appends strerror(errno) to die()Thomas Rast, Jun 6, 2009
  12. 2/3 Convert existing die(..., strerror(errno)) to die_errno()Thomas Rast, Jun 6, 2009
  13. 3/3 Use die_errno() instead of die() when checking syscallsThomas Rast, Jun 6, 2009
  14. Johannes SixtJun 6, 2009
  15. Thomas RastJun 6, 2009
  16. Johannes SixtJun 6, 2009
  17. Johannes SixtJun 6, 2009
  18. Thomas RastJun 6, 2009
  19. Johannes SixtJun 6, 2009
  20. Jeff KingJun 6, 2009
  21. Jeff KingJun 6, 2009
  22. Alexander PotashevJun 7, 2009
  23. Junio C HamanoJun 7, 2009
  24. Jeff KingJun 8, 2009
  25. Alexander PotashevJun 8, 2009
  26. Jeff KingJun 8, 2009
  27. Alexander PotashevJun 4, 2009
  28. Jeff KingJun 4, 2009

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