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Improve our response to invalid format strings, and detect more cases.

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Places that are testing for *printf failure ought to include the format
string in their error reports, since bad-format-string is one of the
more likely causes of such failure.  This both makes it easier to find
and repair the mistake, and provides at least some useful info to the
user who stumbles across such a problem.

Also, tighten snprintf.c to report EINVAL for an invalid flag or
final character in a format %-spec (including the case where the
%-spec is missing a final character altogether).  This seems like
better project policy, and it also allows removing an instruction
or two from the hot code path.

Back-patch the error reporting change in pvsnprintf, since it should be
harmless and may be helpful; but not the snprintf.c change.

Per discussion of bug #15511 from Ertuğrul Kahveci, which reported an
invalid translated format string.  These changes don't fix that error,
but they should improve matters next time we make such a mistake.

Discussion: https://postgr.es/m/15511-1d8b6a0bc874112f@postgresql.org
This commit is contained in:
Tom Lane 2018-12-06 15:08:44 -05:00
parent aa175f61e0
commit d8e1de899c
1 changed files with 2 additions and 2 deletions
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4
src/common/psprintf.c
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@ -129,9 +129,9 @@ pvsnprintf(char *buf, size_t len, const char *fmt, va_list args)
if (nprinted < 0 && errno != 0 && errno != ENOMEM) if (nprinted < 0 && errno != 0 && errno != ENOMEM)
{ {
#ifndef FRONTEND #ifndef FRONTEND
elog(ERROR, "vsnprintf failed: %m"); elog(ERROR, "vsnprintf failed: %m with format string \"%s\"", fmt);
#else #else
fprintf(stderr, "vsnprintf failed: %s\n", strerror(errno)); fprintf(stderr, "vsnprintf failed: %m with format string \"%s\"\n", fmt);
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
#endif #endif
} }