Re: Cygwin strptime() is missing "%s" which strftime() has

[Corinna Vinschen <vinschen@redhat.com>]

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Hi Brian,

On Jul 24 14:41, Brian Inglis wrote:
> On Mon, 24 Jul 2017 02:32:14 -0700, Corinna Vinschen wrote:> On Jul 23 22:07,
> > In this case I have a nit, but this should be discussed on the right
> > mailing list so all affected parties can chime in.  Hint: strtoimax is
> > not available on all platforms yet (patches still in limbo)...
> 
> Figured there would need to be some tweaks for newlib platforms, compilers, and
> style, so made some changes, attached another diff for discussion, before
> submitting a patch.
> Let me know if you want conditionals or declarations changed, hoisted to
> function start, case braces removed, other issues?

See below.

> diff --git a/newlib/libc/time/strptime.c b/newlib/libc/time/strptime.c
> index c0861eb87..112227e40 100644
> --- a/newlib/libc/time/strptime.c
> +++ b/newlib/libc/time/strptime.c
> @@ -38,6 +38,8 @@
>  #include <strings.h>
>  #include <ctype.h>
>  #include <stdlib.h>
> +#include <inttypes.h>
> +#include <limits.h>
>  #include "../locale/setlocale.h"
>  
>  #define _ctloc(x) (_CurrentTimeLocale->x)
> @@ -230,6 +232,13 @@ strptime_l (const char *buf, const char *format, struct tm *timeptr,
>  		buf = s;
>  		ymd |= SET_MDAY;
>  		break;
> +	    case 'F' :		/* %Y-%m-%d */
> +		s = strptime_l (buf, "%Y-%m-%d", timeptr, locale);
> +		if (s == NULL)
> +		    return NULL;
> +		buf = s;
> +		ymd |= SET_YMD;
> +		break;
>  	    case 'H' :
>  	    case 'k' :
>  		ret = strtol_l (buf, &s, 10, locale);
> @@ -300,6 +309,31 @@ strptime_l (const char *buf, const char *format, struct tm *timeptr,
>  		    return NULL;
>  		buf = s;
>  		break;
> +	    case 's' : {
> +#if defined(INTMAX_MAX)
> +#  define BIG_T		intmax_t
> +#  define STRTOBIG	strtoimax
> +#elif defined(LLONG_MAX)
> +#  define BIG_T		long long
> +#  define STRTOBIG	strtoll
> +#else
> +#  define BIG_T		long
> +#  define STRTOBIG	strtol
> +#endif

I don't think we need to use intmax_t at all here.  Checking for
LLONG_MAX should be sufficient.  However, this is strptime_l.  so you
should use strtoll_l/strtol_l, just like the rest of the function.

On second thought, do we have to do this at all?  Our time_t is always
long anyway so using just strtol_l and checking for ERANGE should be
sufficient:

  int old_errno = _REENT->_errno;
  sec = strtol_l (buf, &s, 10);
  int new_errno = _REENT->_errno;
  _REENT->_errno = old_errno;
  if (s == buf || new_errno == ERANGE || etc...

> +		    BIG_T sec;
> +		    time_t t;
> +
> +		    sec = STRTOBIG (buf, &s, 10);
> +		    t = (time_t)sec;
> +		    if (s == buf
> +			|| (BIG_T)t != sec
> +			|| localtime_r (&t, timeptr) != timeptr)

Shouldn't this be gmtime_r?

 %s     The number of seconds since the Epoch, 1970-01-01 00:00:00 +0000
	(UTC).  Leap seconds are not counted unless leap second  support
	is available.


Thanks,
Corinna

-- 
Corinna Vinschen
Cygwin Maintainer
Red Hat

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