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ICU-5086 Use the localtime timezone link check on platforms that support it.

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X-SVN-Rev: 19319
This commit is contained in:
George Rhoten 2006-03-03 06:47:40 +00:00
parent 393617a8f7
commit 5c175798f2
1 changed files with 30 additions and 15 deletions
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45
icu4c/source/common/putil.c
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@ -105,11 +105,11 @@
#elif defined(OS390)
#include "unicode/ucnv.h" /* Needed for UCNV_SWAP_LFNL_OPTION_STRING */
#elif defined(U_AIX)
#elif defined(U_SOLARIS) || defined(U_LINUX)
#elif defined(U_SOLARIS)
#elif defined(U_HPUX)
#elif defined(U_DARWIN)
#include <sys/file.h>
#include <sys/param.h>
#elif defined(U_DARWIN) || defined(U_LINUX) || defined(U_BSD)
#include <limits.h>
#include <unistd.h>
#elif defined(U_QNX)
#include <sys/neutrino.h>
#endif
@ -730,13 +730,23 @@ uprv_timezone()
extern U_IMPORT char *U_TZNAME[];
#endif
#if defined(U_DARWIN) /* For Mac OS X */
#if !UCONFIG_NO_FILE_IO && (defined(U_DARWIN) || defined(U_LINUX) || defined(U_BSD))
/* These platforms are likely to use Olson timezone IDs. */
#define CHECK_LOCALTIME_LINK 1
#define TZZONELINK "/etc/localtime"
#define TZZONEINFO "/usr/share/zoneinfo/"
static char gTimeZoneBuffer[MAXPATHLEN + 2];
static char gTimeZoneBuffer[PATH_MAX];
static char *gTimeZoneBufferPtr = NULL;
#endif
#ifndef U_WINDOWS
static UBool isValidOlsonID(const char *id) {
/* This is sometimes set to "PST8PDT" or similar, so we cannot use it.
The rest of the time it could be an Olson ID. George */
return (UBool)(uprv_strchr(id, '/') != NULL || uprv_strlen(id) < 7);
}
#endif
U_CAPI const char* U_EXPORT2
uprv_tzname(int n)
{
@ -749,20 +759,17 @@ uprv_tzname(int n)
#else
const char *tzenv = NULL;
#if defined(U_DARWIN)
/*#if defined(U_DARWIN)
int ret;
tzenv = getenv("TZFILE");
if (tzenv != NULL) {
return tzenv;
}
#endif
#endif*/
/* TZ is sometimes set to "PST8PDT" or similar, so we cannot use it.
The rest of the time it could be an Olson ID. George */
tzenv = getenv("TZ");
if (tzenv != NULL
&& (uprv_strchr(tzenv, '/') != NULL || uprv_strlen(tzenv) < 7))
if (tzenv != NULL && isValidOlsonID(tzenv))
{
/* This might be a good Olson ID. */
if (uprv_strncmp(tzenv, "posix/", 6) == 0
@ -775,14 +782,22 @@ uprv_tzname(int n)
}
/* else U_TZNAME will give a better result. */
#if defined(U_DARWIN) && !UCONFIG_NO_FILE_IO
#if defined(CHECK_LOCALTIME_LINK)
/* Caller must handle threading issues */
if (gTimeZoneBufferPtr == NULL) {
/*
This is a trick to look at the name of the link to get the Olson ID
because the tzfile contents is underspecified.
This isn't guaranteed to work because it may not be a symlink.
*/
ret = readlink(TZZONELINK, gTimeZoneBuffer, sizeof(gTimeZoneBuffer));
if (0 < ret) {
int32_t tzZoneInfoLen = uprv_strlen(TZZONEINFO);
gTimeZoneBuffer[ret] = 0;
if (uprv_strncmp(gTimeZoneBuffer, TZZONEINFO, sizeof(TZZONEINFO) - 1) == 0) {
return (gTimeZoneBufferPtr = gTimeZoneBuffer + sizeof(TZZONEINFO) - 1);
if (uprv_strncmp(gTimeZoneBuffer, TZZONEINFO, tzZoneInfoLen) == 0
&& isValidOlsonID(gTimeZoneBuffer + tzZoneInfoLen))
{
return (gTimeZoneBufferPtr = gTimeZoneBuffer + tzZoneInfoLen);
}
}
}