From a35c698d879c2d4c6e016661d468d7c04cd93516 Mon Sep 17 00:00:00 2001
From: Baptiste Daroussin <bapt@FreeBSD.org>
Date: Sat, 8 Oct 2016 17:46:29 +0000
Subject: [PATCH] Incorporate a change from OpenBSD by millert@OpenBSD.org

Don't warn about valid time zone abbreviations.  POSIX
through 2000 says that an abbreviation cannot start with ':', and
cannot contain ',', '-', '+', NUL, or a digit.  POSIX from 2001
on changes this rule to say that an abbreviation can contain only
'-', '+', and alphanumeric characters from the portable character
set in the current locale.  To be portable to both sets of rules,
an abbreviation must therefore use only ASCII letters."  Adapted
from tzcode2015f.

This is needed to be able to update tzdata to a newer version

MFC after:	3 days
---
 contrib/tzcode/zic/zdump.c | 24 ++++++++----------------
 contrib/tzcode/zic/zic.c   | 20 +++-----------------
 2 files changed, 11 insertions(+), 33 deletions(-)

diff --git a/contrib/tzcode/zic/zdump.c b/contrib/tzcode/zic/zdump.c
index 2878a707cd33..01111fec2c99 100644
--- a/contrib/tzcode/zic/zdump.c
+++ b/contrib/tzcode/zic/zdump.c
@@ -212,24 +212,16 @@ const char * const	zone;
 		return;
 	cp = abbrp;
 	wp = NULL;
-	while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp))
+	while (isascii((unsigned char) *cp) &&
+		(isalnum((unsigned char)*cp) || *cp == '-' || *cp == '+'))
 		++cp;
-	if (cp - abbrp == 0)
-		wp = _("lacks alphabetic at start");
-	else if (cp - abbrp < 3)
-		wp = _("has fewer than 3 alphabetics");
+	if (cp - abbrp < 3)
+		wp = _("has fewer than 3 characters");
 	else if (cp - abbrp > 6)
-		wp = _("has more than 6 alphabetics");
-	if (wp == NULL && (*cp == '+' || *cp == '-')) {
-		++cp;
-		if (isascii((unsigned char) *cp) &&
-			isdigit((unsigned char) *cp))
-				if (*cp++ == '1' && *cp >= '0' && *cp <= '4')
-					++cp;
-		if (*cp != '\0')
-			wp = _("differs from POSIX standard");
-	}
-	if (wp == NULL)
+		wp = _("has more than 6 characters");
+	else if (*cp)
+		wp = "has characters other than ASCII alphanumerics, '-' or '+'";
+	else
 		return;
 	(void) fflush(stdout);
 	(void) fprintf(stderr,
diff --git a/contrib/tzcode/zic/zic.c b/contrib/tzcode/zic/zic.c
index 5fb8b53c4352..00043b7940e7 100644
--- a/contrib/tzcode/zic/zic.c
+++ b/contrib/tzcode/zic/zic.c
@@ -2615,29 +2615,15 @@ const char * const	string;
 		register const char *	cp;
 		register char *		wp;
 
-		/*
-		** Want one to ZIC_MAX_ABBR_LEN_WO_WARN alphabetics
-		** optionally followed by a + or - and a number from 1 to 14.
-		*/
 		cp = string;
 		wp = NULL;
 		while (isascii((unsigned char) *cp) &&
-			isalpha((unsigned char) *cp))
+			(isalnum((unsigned char)*cp) || *cp == '-' || *cp == '+'))
 				++cp;
-		if (cp - string == 0)
-wp = _("time zone abbreviation lacks alphabetic at start");
 		if (noise && cp - string > 3)
-wp = _("time zone abbreviation has more than 3 alphabetics");
+wp = _("time zone abbreviation has more than 3 characters");
 		if (cp - string > ZIC_MAX_ABBR_LEN_WO_WARN)
-wp = _("time zone abbreviation has too many alphabetics");
-		if (wp == NULL && (*cp == '+' || *cp == '-')) {
-			++cp;
-			if (isascii((unsigned char) *cp) &&
-				isdigit((unsigned char) *cp))
-					if (*cp++ == '1' &&
-						*cp >= '0' && *cp <= '4')
-							++cp;
-		}
+wp = _("time zone abbreviation has too many characters");
 		if (*cp != '\0')
 wp = _("time zone abbreviation differs from POSIX standard");
 		if (wp != NULL) {