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* [newlib-cygwin] TZ: Replace unreliable isupper calls on wchars
@ 2016-05-25 10:13 Corinna Vinschen
0 siblings, 0 replies; only message in thread
From: Corinna Vinschen @ 2016-05-25 10:13 UTC (permalink / raw)
To: cygwin-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=030d86d04dbd6ae878ff894256c5a465890d5970
commit 030d86d04dbd6ae878ff894256c5a465890d5970
Author: Corinna Vinschen <corinna@vinschen.de>
Date: Wed May 25 12:13:03 2016 +0200
TZ: Replace unreliable isupper calls on wchars
In case the TZ variable is empty, Cygwin fetches timezone info from
Windows. Extracting the timezone short name uses isupper on wide chars.
Replace with explicit check for A <= character <= Z to be independent
of undefined behaviour.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Diff:
---
winsup/cygwin/localtime.cc | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/winsup/cygwin/localtime.cc b/winsup/cygwin/localtime.cc
index d57a020..2d10508 100644
--- a/winsup/cygwin/localtime.cc
+++ b/winsup/cygwin/localtime.cc
@@ -1543,7 +1543,8 @@ tzsetwall (void)
GetTimeZoneInformation(&tz);
dst = cp = buf;
for (src = tz.StandardName; *src; src++)
- if (isupper(*src)) *dst++ = *src;
+ if (*src >= L'A' && *src <= L'Z')
+ *dst++ = *src;
if ((dst - cp) < 3)
{
/* In non-english Windows, converted tz.StandardName
@@ -1561,7 +1562,8 @@ tzsetwall (void)
cp = strchr(cp, 0);
dst = cp;
for (src = tz.DaylightName; *src; src++)
- if (isupper(*src)) *dst++ = *src;
+ if (*src >= L'A' && *src <= L'Z')
+ *dst++ = *src;
if ((dst - cp) < 3)
{
/* In non-english Windows, converted tz.DaylightName
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