DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:from:to:subject:date:message-id:content-type
	:content-transfer-encoding:mime-version; q=dns; s=default; b=A2i
	veqPArUCXfvkAvJyXpXaj8Nwv4tjvmoVbQQr8yEA9luRzFRwaeO8hM+DeziGNZjM
	X/tbs7foVy22RaPwr6HzCi+wEi0M46BEFt0IVqNOMglOXOZJh5dEDVFREQBcYFis
	uiIYyypYmOh7OBsiYAjMdmgJ1UOc1rQluE2X91xw=
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
From: "Lavrentiev, Anton (NIH/NLM/NCBI) [C]" <lavr AT ncbi DOT nlm DOT nih DOT gov>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Cygwin strptime() is missing "%s" which strftime() has
Date: Sat, 22 Jul 2017 20:48:26 +0000
Message-ID: <BN3PR09MB0340BFF87B6B3E7A100C1A8EA5A50@BN3PR09MB0340.namprd09.prod.outlook.com>
spamdiagnosticoutput: 1:99
spamdiagnosticmetadata: NSPM
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Jul 2017 20:48:26.6844 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 14b77578-9773-42d5-8507-251ca2dc2b06
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN3PR09MB0338
X-OriginatorOrg: ncbi.nlm.nih.gov
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id v6MKnSqH024482

Hello,

It looks like Cygwin implementation of strptime(3) cannot understand the "%s" format (seconds since Jan 1, 1970 UTC), which strftime() can.

When I test the same code of Linux, it appears to work correctly.

Cygwin:
$ gcc -Wall -o timetest timetest.c
$ ./timetest
1500755837 -> 1500755837
Cannot convert string

Linux:

$ gcc -Wall -o timetest timetest.c
$ ./timetest
1500755887 -> 1500755887
1500755887 -> 1500755887, unconverted: ""

Anton Lavrentiev
Contractor NIH/NLM/NCBI

$ cat timetest.c
#define _XOPEN_SOURCE
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

int main()
{
    time_t now = time(0);
    struct tm tm = *localtime(&now);
    char str[80], *s;
    size_t n = strftime(str, sizeof(str), "%s", &tm);
    if (!n) {
        printf("Cannot convert time");
        return 1;
    }
    assert(n == strlen(str));
    printf("%lu -> %s\n", (unsigned long) now, str);
    memset(&tm, 0, sizeof(tm));
    if (!(s = strptime(str, "%s", &tm))) {
        printf("Cannot convert string");
        return 1;
    }
    now = mktime(&tm);
    printf("%s -> %lu, unconverted: \"%s\"\n", str, (unsigned long) now, s);
    return 0;    
}


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple