[newlib-cygwin] strptime.cc(__strptime): add %q GNU quarter

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=7f7e4e5bc5e01a4dc90a10ebff8949f1c0c034dd

commit 7f7e4e5bc5e01a4dc90a10ebff8949f1c0c034dd
Author: Brian Inglis <Brian.Inglis@SystematicSW.ab.ca>
Date:   Fri Oct 21 23:16:03 2022 -0600

    strptime.cc(__strptime): add %q GNU quarter

Diff:
---
 winsup/cygwin/libc/strptime.cc | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/libc/strptime.cc b/winsup/cygwin/libc/strptime.cc
index 3a9bdbb30..dc5572310 100644
--- a/winsup/cygwin/libc/strptime.cc
+++ b/winsup/cygwin/libc/strptime.cc
@@ -570,6 +570,14 @@ literal:
 			LEGAL_ALT(0);
 			continue;
 
+		case 'q':	/* The quarter year. GNU extension. */
+			LEGAL_ALT(0);
+			i = 1;
+			bp = conv_num(bp, &i, 1, 4, ALT_DIGITS);
+			tm->tm_mon = (i - 1)*3;
+			ymd |= SET_MON;
+			continue;
+
 		case 'S':	/* The seconds. */
 			LEGAL_ALT(ALT_O);
 			bp = conv_num(bp, &tm->tm_sec, 0, 61, ALT_DIGITS);
@@ -655,7 +663,7 @@ literal:
 			got_eoff = 0;
 			continue;
 
-		case 'y':	/* The year within 100 years of the epoch. */
+		case 'y':	/* The year within 100 years of the century or era. */
 			/* LEGAL_ALT(ALT_E | ALT_O); */
 			ymd |= SET_YEAR;
 			if ((alt_format & ALT_E) && *era_info)