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Message-ID: <CAMquMNTmDZnGvtPo3H0Uo-3ytGDO5EHa+RHCBTZTph6c3WFsYA@mail.gmail.com>
Date: Mon, 15 Mar 2021 21:43:36 +0200
From: Yossi Gottlieb <yossigo@...il.com>
To: musl@...ts.openwall.com
Subject: strftime() unexpectedly modifies errno
It seems like strftime() unexpectedly modifies errno, which is always set
to EINVAL when it returns. Looks like it's not related to any specific
format.
Here's an example:
#include <stdio.h>
#include <sys/time.h>
#include <time.h>
#include <errno.h>
int main(int argc, char *argv[])
{
time_t now = time(NULL);
struct tm *tm = localtime(&now);
char buf[100];
errno = 0;
size_t len = strftime(buf, sizeof(buf), "%d %b %Y %H:%M:%S.", tm);
printf("len=%zu\n", len);
printf("buf=%s\n", buf);
printf("errno=%d\n", errno);
}
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