Merge r307359 from stable/10:

    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.

Errata Notice:	EN-16:19.tzcode
Submitted by:	bapt
Approved by:	so

1 files changed, 3 insertions, 17 deletions

diff --git a/contrib/tzcode/zic/zic.c b/contrib/tzcode/zic/zic.c
index 5fb8b53..00043b7 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) {