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xgethostname: handle long hostnames

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If the full hostname doesn't fit in the buffer supplied to
gethostname, POSIX does not specify whether the buffer will be
null-terminated, so to be safe, we should do it ourselves.  Introduce
new function, xgethostname, which ensures that there is always a \0
at the end of the buffer.

Signed-off-by: David Turner <dturner@twosigma.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
David Turner
2017-04-18 17:57:43 -04:00
committed by Junio C Hamano
parent da25bdb776
commit 5781a9a270
6 changed files with 19 additions and 4 deletions
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2
builtin/receive-pack.c
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@ -1660,7 +1660,7 @@ static const char *unpack(int err_fd, struct shallow_info *si)
argv_array_pushl(&child.args, "index-pack",
"--stdin", hdr_arg, NULL);
if (gethostname(hostname, sizeof(hostname)))
if (xgethostname(hostname, sizeof(hostname)))
xsnprintf(hostname, sizeof(hostname), "localhost");
argv_array_pushf(&child.args,
"--keep=receive-pack %"PRIuMAX" on %s",