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Fix unsafe assumption that struct timeval.tv_sec is a "long".

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It typically is a "long", but it seems possible that on some platforms
it wouldn't be.  In any case, this silences a compiler warning on
OpenBSD (cf buildfarm member curculio).

While at it, use snprintf not sprintf.  This format string couldn't
possibly overrun the supplied buffer, but that doesn't seem like
a good reason not to use the safer style.

Oversight in commit f828654e1.  Back-patch to 9.6 where that came in.
This commit is contained in:
Tom Lane
2016-12-06 19:52:34 -05:00
parent ebe5dc9e02
commit 81f3c20a65
1 changed files with 3 additions and 2 deletions
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5
src/backend/utils/error/elog.c
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@ -2484,8 +2484,9 @@ log_line_prefix(StringInfo buf, ErrorData *edata)
saved_timeval_set = true; saved_timeval_set = true;
} }
sprintf(strfbuf, "%ld.%03d", saved_timeval.tv_sec, snprintf(strfbuf, sizeof(strfbuf), "%ld.%03d",
(int) (saved_timeval.tv_usec / 1000)); (long) saved_timeval.tv_sec,
(int) (saved_timeval.tv_usec / 1000));
if (padding != 0) if (padding != 0)
appendStringInfo(buf, "%*s", padding, strfbuf); appendStringInfo(buf, "%*s", padding, strfbuf);