[newlib-cygwin] winsup/cygwin/libc/strptime.cc(__strptime) fix %F width

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=d8e2463c75d946f30af19705ad922085185784a5

commit d8e2463c75d946f30af19705ad922085185784a5
Author: Brian Inglis <brian.ing...@systematicsw.ab.ca>
Date:   Tue Aug 29 11:25:43 2017 -0600

    winsup/cygwin/libc/strptime.cc(__strptime) fix %F width

Diff:
---
 winsup/cygwin/libc/strptime.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/libc/strptime.cc b/winsup/cygwin/libc/strptime.cc
index 7c6cc20..081aca3 100644
--- a/winsup/cygwin/libc/strptime.cc
+++ b/winsup/cygwin/libc/strptime.cc
@@ -413,13 +413,15 @@ literal:
                case 'F':       /* The date as "%Y-%m-%d". */
                        {
                          LEGAL_ALT(0);
-                         ymd |= SET_YMD;
                          char *tmp = __strptime ((const char *) bp, "%Y-%m-%d",
                                                  tm, era_info, alt_digits,
                                                  locale);
-                         if (tmp && (uint) (tmp - (char *) bp) > width)
+                         /* width max chars converted, default 10, < 6 => 6 */
+                         if (tmp && (char *) bp +
+                               (!width ? 10 : width < 6 ? 6 : width) < tmp)
                            return NULL;
                          bp = (const unsigned char *) tmp;
+                         ymd |= SET_YMD;
                          continue;
                        }