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os: make FormatInt64() handle LONG_MIN correctly

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When compiling with gcc 15.2.0 using -O3 -m64 on Solaris SPARC & x64,
we'd get a test failure of:

Assertion failed: strcmp(logmsg, expected) == 0,
 file ../test/signal-logging.c, line 339, function logging_format

because 'num *= -1' produced a value that was out of the range of the
int64_t it was being stored in.  (Compiling with -O2 worked fine with
the same compiler/configuration/platform though.)

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2117>
This commit is contained in:
Alan Coopersmith
2026-01-01 02:17:21 +02:00
committed by Enrico Weigelt, metux IT consult
parent 3a367c5a47
commit 2a41522349
1 changed files with 4 additions and 2 deletions
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6
os/fmt.c
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@@ -16,12 +16,14 @@
void
FormatInt64(int64_t num, char *string)
{
uint64_t unum = num;
if (num < 0) {
string[0] = '-';
num *= -1;
unum = num * -1;
string++;
}
FormatUInt64(num, string);
FormatUInt64(unum, string);
}
/* Format a number into a string in a signal safe manner. The string should be