--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/unix/native/libjava/TimeZone_md.c Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,912 @@
+/*
+ * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <strings.h>
+#include <time.h>
+#include <limits.h>
+#include <errno.h>
+#include <stddef.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <string.h>
+#include <dirent.h>
+#include <unistd.h>
+#if defined(__solaris__)
+#include <libscf.h>
+#endif
+
+#include "jvm.h"
+#include "TimeZone_md.h"
+
+#define SKIP_SPACE(p) while (*p == ' ' || *p == '\t') p++;
+
+#define RESTARTABLE(_cmd, _result) do { \
+ do { \
+ _result = _cmd; \
+ } while((_result == -1) && (errno == EINTR)); \
+} while(0)
+
+#if defined(_ALLBSD_SOURCE)
+#define dirent64 dirent
+#define readdir64_r readdir_r
+#endif
+
+#if !defined(__solaris__) || defined(__sparcv9) || defined(amd64)
+#define fileopen fopen
+#define filegets fgets
+#define fileclose fclose
+#endif
+
+#if defined(__linux__) || defined(_ALLBSD_SOURCE)
+static const char *ETC_TIMEZONE_FILE = "/etc/timezone";
+static const char *ZONEINFO_DIR = "/usr/share/zoneinfo";
+static const char *DEFAULT_ZONEINFO_FILE = "/etc/localtime";
+#else
+static const char *SYS_INIT_FILE = "/etc/default/init";
+static const char *ZONEINFO_DIR = "/usr/share/lib/zoneinfo";
+static const char *DEFAULT_ZONEINFO_FILE = "/usr/share/lib/zoneinfo/localtime";
+#endif /* defined(__linux__) || defined(_ALLBSD_SOURCE) */
+
+#if defined(_AIX)
+static const char *ETC_ENVIRONMENT_FILE = "/etc/environment";
+#endif
+
+#if defined(__linux__) || defined(MACOSX) || defined(__solaris__)
+
+/*
+ * Returns a pointer to the zone ID portion of the given zoneinfo file
+ * name, or NULL if the given string doesn't contain "zoneinfo/".
+ */
+static char *
+getZoneName(char *str)
+{
+ static const char *zidir = "zoneinfo/";
+
+ char *pos = strstr((const char *)str, zidir);
+ if (pos == NULL) {
+ return NULL;
+ }
+ return pos + strlen(zidir);
+}
+
+/*
+ * Returns a path name created from the given 'dir' and 'name' under
+ * UNIX. This function allocates memory for the pathname calling
+ * malloc(). NULL is returned if malloc() fails.
+ */
+static char *
+getPathName(const char *dir, const char *name) {
+ char *path;
+
+ path = (char *) malloc(strlen(dir) + strlen(name) + 2);
+ if (path == NULL) {
+ return NULL;
+ }
+ return strcat(strcat(strcpy(path, dir), "/"), name);
+}
+
+/*
+ * Scans the specified directory and its subdirectories to find a
+ * zoneinfo file which has the same content as /etc/localtime on Linux
+ * or /usr/share/lib/zoneinfo/localtime on Solaris given in 'buf'.
+ * If file is symbolic link, then the contents it points to are in buf.
+ * Returns a zone ID if found, otherwise, NULL is returned.
+ */
+static char *
+findZoneinfoFile(char *buf, size_t size, const char *dir)
+{
+ DIR *dirp = NULL;
+ struct stat statbuf;
+ struct dirent64 *dp = NULL;
+ struct dirent64 *entry = NULL;
+ char *pathname = NULL;
+ int fd = -1;
+ char *dbuf = NULL;
+ char *tz = NULL;
+ int res;
+ long name_max = 0;
+
+ dirp = opendir(dir);
+ if (dirp == NULL) {
+ return NULL;
+ }
+
+ name_max = pathconf(dir, _PC_NAME_MAX);
+ // If pathconf did not work, fall back to a mimimum buffer size.
+ if (name_max < 1024) {
+ name_max = 1024;
+ }
+
+ entry = (struct dirent64 *)malloc(offsetof(struct dirent64, d_name) + name_max + 1);
+ if (entry == NULL) {
+ (void) closedir(dirp);
+ return NULL;
+ }
+
+ while (readdir64_r(dirp, entry, &dp) == 0 && dp != NULL) {
+ /*
+ * Skip '.' and '..' (and possibly other .* files)
+ */
+ if (dp->d_name[0] == '.') {
+ continue;
+ }
+
+ /*
+ * Skip "ROC", "posixrules", and "localtime".
+ */
+ if ((strcmp(dp->d_name, "ROC") == 0)
+ || (strcmp(dp->d_name, "posixrules") == 0)
+#if defined(__solaris__)
+ /*
+ * Skip the "src" and "tab" directories on Solaris.
+ */
+ || (strcmp(dp->d_name, "src") == 0)
+ || (strcmp(dp->d_name, "tab") == 0)
+#endif
+ || (strcmp(dp->d_name, "localtime") == 0)) {
+ continue;
+ }
+
+ pathname = getPathName(dir, dp->d_name);
+ if (pathname == NULL) {
+ break;
+ }
+ RESTARTABLE(stat(pathname, &statbuf), res);
+ if (res == -1) {
+ break;
+ }
+
+ if (S_ISDIR(statbuf.st_mode)) {
+ tz = findZoneinfoFile(buf, size, pathname);
+ if (tz != NULL) {
+ break;
+ }
+ } else if (S_ISREG(statbuf.st_mode) && (size_t)statbuf.st_size == size) {
+ dbuf = (char *) malloc(size);
+ if (dbuf == NULL) {
+ break;
+ }
+ RESTARTABLE(open(pathname, O_RDONLY), fd);
+ if (fd == -1) {
+ break;
+ }
+ RESTARTABLE(read(fd, dbuf, size), res);
+ if (res != (ssize_t) size) {
+ break;
+ }
+ if (memcmp(buf, dbuf, size) == 0) {
+ tz = getZoneName(pathname);
+ if (tz != NULL) {
+ tz = strdup(tz);
+ }
+ break;
+ }
+ free((void *) dbuf);
+ dbuf = NULL;
+ (void) close(fd);
+ fd = -1;
+ }
+ free((void *) pathname);
+ pathname = NULL;
+ }
+
+ if (entry != NULL) {
+ free((void *) entry);
+ }
+ if (dirp != NULL) {
+ (void) closedir(dirp);
+ }
+ if (pathname != NULL) {
+ free((void *) pathname);
+ }
+ if (fd != -1) {
+ (void) close(fd);
+ }
+ if (dbuf != NULL) {
+ free((void *) dbuf);
+ }
+ return tz;
+}
+
+#if defined(__linux__) || defined(MACOSX)
+
+/*
+ * Performs Linux specific mapping and returns a zone ID
+ * if found. Otherwise, NULL is returned.
+ */
+static char *
+getPlatformTimeZoneID()
+{
+ struct stat statbuf;
+ char *tz = NULL;
+ FILE *fp;
+ int fd;
+ char *buf;
+ size_t size;
+ int res;
+
+#if defined(__linux__)
+ /*
+ * Try reading the /etc/timezone file for Debian distros. There's
+ * no spec of the file format available. This parsing assumes that
+ * there's one line of an Olson tzid followed by a '\n', no
+ * leading or trailing spaces, no comments.
+ */
+ if ((fp = fopen(ETC_TIMEZONE_FILE, "r")) != NULL) {
+ char line[256];
+
+ if (fgets(line, sizeof(line), fp) != NULL) {
+ char *p = strchr(line, '\n');
+ if (p != NULL) {
+ *p = '\0';
+ }
+ if (strlen(line) > 0) {
+ tz = strdup(line);
+ }
+ }
+ (void) fclose(fp);
+ if (tz != NULL) {
+ return tz;
+ }
+ }
+#endif /* defined(__linux__) */
+
+ /*
+ * Next, try /etc/localtime to find the zone ID.
+ */
+ RESTARTABLE(lstat(DEFAULT_ZONEINFO_FILE, &statbuf), res);
+ if (res == -1) {
+ return NULL;
+ }
+
+ /*
+ * If it's a symlink, get the link name and its zone ID part. (The
+ * older versions of timeconfig created a symlink as described in
+ * the Red Hat man page. It was changed in 1999 to create a copy
+ * of a zoneinfo file. It's no longer possible to get the zone ID
+ * from /etc/localtime.)
+ */
+ if (S_ISLNK(statbuf.st_mode)) {
+ char linkbuf[PATH_MAX+1];
+ int len;
+
+ if ((len = readlink(DEFAULT_ZONEINFO_FILE, linkbuf, sizeof(linkbuf)-1)) == -1) {
+ jio_fprintf(stderr, (const char *) "can't get a symlink of %s\n",
+ DEFAULT_ZONEINFO_FILE);
+ return NULL;
+ }
+ linkbuf[len] = '\0';
+ tz = getZoneName(linkbuf);
+ if (tz != NULL) {
+ tz = strdup(tz);
+ return tz;
+ }
+ }
+
+ /*
+ * If it's a regular file, we need to find out the same zoneinfo file
+ * that has been copied as /etc/localtime.
+ * If initial symbolic link resolution failed, we should treat target
+ * file as a regular file.
+ */
+ RESTARTABLE(open(DEFAULT_ZONEINFO_FILE, O_RDONLY), fd);
+ if (fd == -1) {
+ return NULL;
+ }
+
+ RESTARTABLE(fstat(fd, &statbuf), res);
+ if (res == -1) {
+ (void) close(fd);
+ return NULL;
+ }
+ size = (size_t) statbuf.st_size;
+ buf = (char *) malloc(size);
+ if (buf == NULL) {
+ (void) close(fd);
+ return NULL;
+ }
+
+ RESTARTABLE(read(fd, buf, size), res);
+ if (res != (ssize_t) size) {
+ (void) close(fd);
+ free((void *) buf);
+ return NULL;
+ }
+ (void) close(fd);
+
+ tz = findZoneinfoFile(buf, size, ZONEINFO_DIR);
+ free((void *) buf);
+ return tz;
+}
+
+#elif defined(__solaris__)
+
+#if !defined(__sparcv9) && !defined(amd64)
+
+/*
+ * Those file* functions mimic the UNIX stream io functions. This is
+ * because of the limitation of the number of open files on Solaris
+ * (32-bit mode only) due to the System V ABI.
+ */
+
+#define BUFFER_SIZE 4096
+
+static struct iobuffer {
+ int magic; /* -1 to distinguish from the real FILE */
+ int fd; /* file descriptor */
+ char *buffer; /* pointer to buffer */
+ char *ptr; /* current read pointer */
+ char *endptr; /* end pointer */
+};
+
+static int
+fileclose(FILE *stream)
+{
+ struct iobuffer *iop = (struct iobuffer *) stream;
+
+ if (iop->magic != -1) {
+ return fclose(stream);
+ }
+
+ if (iop == NULL) {
+ return 0;
+ }
+ close(iop->fd);
+ free((void *)iop->buffer);
+ free((void *)iop);
+ return 0;
+}
+
+static FILE *
+fileopen(const char *fname, const char *fmode)
+{
+ FILE *fp;
+ int fd;
+ struct iobuffer *iop;
+
+ if ((fp = fopen(fname, fmode)) != NULL) {
+ return fp;
+ }
+
+ /*
+ * It assumes read open.
+ */
+ RESTARTABLE(open(fname, O_RDONLY), fd);
+ if (fd == -1) {
+ return NULL;
+ }
+
+ /*
+ * Allocate struct iobuffer and its buffer
+ */
+ iop = malloc(sizeof(struct iobuffer));
+ if (iop == NULL) {
+ (void) close(fd);
+ errno = ENOMEM;
+ return NULL;
+ }
+ iop->magic = -1;
+ iop->fd = fd;
+ iop->buffer = malloc(BUFFER_SIZE);
+ if (iop->buffer == NULL) {
+ (void) close(fd);
+ free((void *) iop);
+ errno = ENOMEM;
+ return NULL;
+ }
+ iop->ptr = iop->buffer;
+ iop->endptr = iop->buffer;
+ return (FILE *)iop;
+}
+
+/*
+ * This implementation assumes that n is large enough and the line
+ * separator is '\n'.
+ */
+static char *
+filegets(char *s, int n, FILE *stream)
+{
+ struct iobuffer *iop = (struct iobuffer *) stream;
+ char *p;
+
+ if (iop->magic != -1) {
+ return fgets(s, n, stream);
+ }
+
+ p = s;
+ for (;;) {
+ char c;
+
+ if (iop->ptr == iop->endptr) {
+ ssize_t len;
+
+ RESTARTABLE(read(iop->fd, (void *)iop->buffer, BUFFER_SIZE), len);
+ if (len == -1) {
+ return NULL;
+ }
+ if (len == 0) {
+ *p = 0;
+ if (s == p) {
+ return NULL;
+ }
+ return s;
+ }
+ iop->ptr = iop->buffer;
+ iop->endptr = iop->buffer + len;
+ }
+ c = *iop->ptr++;
+ *p++ = c;
+ if ((p - s) == (n - 1)) {
+ *p = 0;
+ return s;
+ }
+ if (c == '\n') {
+ *p = 0;
+ return s;
+ }
+ }
+ /*NOTREACHED*/
+}
+#endif /* !defined(__sparcv9) && !defined(amd64) */
+
+/*
+ * Performs Solaris dependent mapping. Returns a zone ID if
+ * found. Otherwise, NULL is returned. Solaris libc looks up
+ * "/etc/default/init" to get the default TZ value if TZ is not defined
+ * as an environment variable.
+ */
+static char *
+getPlatformTimeZoneID()
+{
+ char *tz = NULL;
+ FILE *fp;
+
+ /*
+ * Try the TZ entry in /etc/default/init.
+ */
+ if ((fp = fileopen(SYS_INIT_FILE, "r")) != NULL) {
+ char line[256];
+ char quote = '\0';
+
+ while (filegets(line, sizeof(line), fp) != NULL) {
+ char *p = line;
+ char *s;
+ char c;
+
+ /* quick check for comment lines */
+ if (*p == '#') {
+ continue;
+ }
+ if (strncmp(p, "TZ=", 3) == 0) {
+ p += 3;
+ SKIP_SPACE(p);
+ c = *p;
+ if (c == '"' || c == '\'') {
+ quote = c;
+ p++;
+ }
+
+ /*
+ * PSARC/2001/383: quoted string support
+ */
+ for (s = p; (c = *s) != '\0' && c != '\n'; s++) {
+ /* No '\\' is supported here. */
+ if (c == quote) {
+ quote = '\0';
+ break;
+ }
+ if (c == ' ' && quote == '\0') {
+ break;
+ }
+ }
+ if (quote != '\0') {
+ jio_fprintf(stderr, "ZoneInfo: unterminated time zone name in /etc/TIMEZONE\n");
+ }
+ *s = '\0';
+ tz = strdup(p);
+ break;
+ }
+ }
+ (void) fileclose(fp);
+ }
+ return tz;
+}
+
+#define TIMEZONE_FMRI "svc:/system/timezone:default"
+#define TIMEZONE_PG "timezone"
+#define LOCALTIME_PROP "localtime"
+
+static void
+cleanupScf(scf_handle_t *h,
+ scf_snapshot_t *snap,
+ scf_instance_t *inst,
+ scf_propertygroup_t *pg,
+ scf_property_t *prop,
+ scf_value_t *val,
+ char *buf) {
+ if (buf != NULL) {
+ free(buf);
+ }
+ if (snap != NULL) {
+ scf_snapshot_destroy(snap);
+ }
+ if (val != NULL) {
+ scf_value_destroy(val);
+ }
+ if (prop != NULL) {
+ scf_property_destroy(prop);
+ }
+ if (pg != NULL) {
+ scf_pg_destroy(pg);
+ }
+ if (inst != NULL) {
+ scf_instance_destroy(inst);
+ }
+ if (h != NULL) {
+ scf_handle_destroy(h);
+ }
+}
+
+/*
+ * Returns a zone ID of Solaris when the TZ value is "localtime".
+ * First, it tries scf. If scf fails, it looks for the same file as
+ * /usr/share/lib/zoneinfo/localtime under /usr/share/lib/zoneinfo/.
+ */
+static char *
+getSolarisDefaultZoneID() {
+ char *tz = NULL;
+ struct stat statbuf;
+ size_t size;
+ char *buf;
+ int fd;
+ int res;
+ /* scf specific variables */
+ scf_handle_t *h = NULL;
+ scf_snapshot_t *snap = NULL;
+ scf_instance_t *inst = NULL;
+ scf_propertygroup_t *pg = NULL;
+ scf_property_t *prop = NULL;
+ scf_value_t *val = NULL;
+
+ if ((h = scf_handle_create(SCF_VERSION)) != NULL
+ && scf_handle_bind(h) == 0
+ && (inst = scf_instance_create(h)) != NULL
+ && (snap = scf_snapshot_create(h)) != NULL
+ && (pg = scf_pg_create(h)) != NULL
+ && (prop = scf_property_create(h)) != NULL
+ && (val = scf_value_create(h)) != NULL
+ && scf_handle_decode_fmri(h, TIMEZONE_FMRI, NULL, NULL, inst,
+ NULL, NULL, SCF_DECODE_FMRI_REQUIRE_INSTANCE) == 0
+ && scf_instance_get_snapshot(inst, "running", snap) == 0
+ && scf_instance_get_pg_composed(inst, snap, TIMEZONE_PG, pg) == 0
+ && scf_pg_get_property(pg, LOCALTIME_PROP, prop) == 0
+ && scf_property_get_value(prop, val) == 0) {
+ ssize_t len;
+
+ /* Gets the length of the zone ID string */
+ len = scf_value_get_astring(val, NULL, 0);
+ if (len != -1) {
+ tz = malloc(++len); /* +1 for a null byte */
+ if (tz != NULL && scf_value_get_astring(val, tz, len) != -1) {
+ cleanupScf(h, snap, inst, pg, prop, val, NULL);
+ return tz;
+ }
+ }
+ }
+ cleanupScf(h, snap, inst, pg, prop, val, tz);
+
+ RESTARTABLE(stat(DEFAULT_ZONEINFO_FILE, &statbuf), res);
+ if (res == -1) {
+ return NULL;
+ }
+ size = (size_t) statbuf.st_size;
+ buf = malloc(size);
+ if (buf == NULL) {
+ return NULL;
+ }
+ RESTARTABLE(open(DEFAULT_ZONEINFO_FILE, O_RDONLY), fd);
+ if (fd == -1) {
+ free((void *) buf);
+ return NULL;
+ }
+
+ RESTARTABLE(read(fd, buf, size), res);
+ if (res != (ssize_t) size) {
+ (void) close(fd);
+ free((void *) buf);
+ return NULL;
+ }
+ (void) close(fd);
+ tz = findZoneinfoFile(buf, size, ZONEINFO_DIR);
+ free((void *) buf);
+ return tz;
+}
+
+#endif /* defined(__solaris__) */
+
+#elif defined(_AIX)
+
+static char *
+getPlatformTimeZoneID()
+{
+ FILE *fp;
+ char *tz = NULL;
+ char *tz_key = "TZ=";
+ char line[256];
+ size_t tz_key_len = strlen(tz_key);
+
+ if ((fp = fopen(ETC_ENVIRONMENT_FILE, "r")) != NULL) {
+ while (fgets(line, sizeof(line), fp) != NULL) {
+ char *p = strchr(line, '\n');
+ if (p != NULL) {
+ *p = '\0';
+ }
+ if (0 == strncmp(line, tz_key, tz_key_len)) {
+ tz = strdup(line + tz_key_len);
+ break;
+ }
+ }
+ (void) fclose(fp);
+ }
+
+ return tz;
+}
+
+static char *
+mapPlatformToJavaTimezone(const char *java_home_dir, const char *tz) {
+ FILE *tzmapf;
+ char mapfilename[PATH_MAX + 1];
+ char line[256];
+ int linecount = 0;
+ char *tz_buf = NULL;
+ char *temp_tz = NULL;
+ char *javatz = NULL;
+ size_t tz_len = 0;
+
+ /* On AIX, the TZ environment variable may end with a comma
+ * followed by modifier fields. These are ignored here. */
+ temp_tz = strchr(tz, ',');
+ tz_len = (temp_tz == NULL) ? strlen(tz) : temp_tz - tz;
+ tz_buf = (char *)malloc(tz_len + 1);
+ memcpy(tz_buf, tz, tz_len);
+ tz_buf[tz_len] = 0;
+
+ /* Open tzmappings file, with buffer overrun check */
+ if ((strlen(java_home_dir) + 15) > PATH_MAX) {
+ jio_fprintf(stderr, "Path %s/lib/tzmappings exceeds maximum path length\n", java_home_dir);
+ goto tzerr;
+ }
+ strcpy(mapfilename, java_home_dir);
+ strcat(mapfilename, "/lib/tzmappings");
+ if ((tzmapf = fopen(mapfilename, "r")) == NULL) {
+ jio_fprintf(stderr, "can't open %s\n", mapfilename);
+ goto tzerr;
+ }
+
+ while (fgets(line, sizeof(line), tzmapf) != NULL) {
+ char *p = line;
+ char *sol = line;
+ char *java;
+ int result;
+
+ linecount++;
+ /*
+ * Skip comments and blank lines
+ */
+ if (*p == '#' || *p == '\n') {
+ continue;
+ }
+
+ /*
+ * Get the first field, platform zone ID
+ */
+ while (*p != '\0' && *p != '\t') {
+ p++;
+ }
+ if (*p == '\0') {
+ /* mapping table is broken! */
+ jio_fprintf(stderr, "tzmappings: Illegal format at near line %d.\n", linecount);
+ break;
+ }
+
+ *p++ = '\0';
+ if ((result = strncmp(tz_buf, sol, tz_len)) == 0) {
+ /*
+ * If this is the current platform zone ID,
+ * take the Java time zone ID (2nd field).
+ */
+ java = p;
+ while (*p != '\0' && *p != '\n') {
+ p++;
+ }
+
+ if (*p == '\0') {
+ /* mapping table is broken! */
+ jio_fprintf(stderr, "tzmappings: Illegal format at line %d.\n", linecount);
+ break;
+ }
+
+ *p = '\0';
+ javatz = strdup(java);
+ break;
+ } else if (result < 0) {
+ break;
+ }
+ }
+ (void) fclose(tzmapf);
+
+tzerr:
+ if (tz_buf != NULL ) {
+ free((void *) tz_buf);
+ }
+
+ if (javatz == NULL) {
+ return getGMTOffsetID();
+ }
+
+ return javatz;
+}
+
+#endif /* defined(_AIX) */
+
+/*
+ * findJavaTZ_md() maps platform time zone ID to Java time zone ID
+ * using <java_home>/lib/tzmappings. If the TZ value is not found, it
+ * trys some libc implementation dependent mappings. If it still
+ * can't map to a Java time zone ID, it falls back to the GMT+/-hh:mm
+ * form.
+ */
+/*ARGSUSED1*/
+char *
+findJavaTZ_md(const char *java_home_dir)
+{
+ char *tz;
+ char *javatz = NULL;
+ char *freetz = NULL;
+
+ tz = getenv("TZ");
+
+ if (tz == NULL || *tz == '\0') {
+ tz = getPlatformTimeZoneID();
+ freetz = tz;
+ }
+
+ if (tz != NULL) {
+ /* Ignore preceding ':' */
+ if (*tz == ':') {
+ tz++;
+ }
+#if defined(__linux__)
+ /* Ignore "posix/" prefix on Linux. */
+ if (strncmp(tz, "posix/", 6) == 0) {
+ tz += 6;
+ }
+#endif
+
+#if defined(_AIX)
+ /* On AIX do the platform to Java mapping. */
+ javatz = mapPlatformToJavaTimezone(java_home_dir, tz);
+ if (freetz != NULL) {
+ free((void *) freetz);
+ }
+#else
+#if defined(__solaris__)
+ /* Solaris might use localtime, so handle it here. */
+ if (strcmp(tz, "localtime") == 0) {
+ javatz = getSolarisDefaultZoneID();
+ if (freetz != NULL) {
+ free((void *) freetz);
+ }
+ } else
+#endif
+ if (freetz == NULL) {
+ /* strdup if we are still working on getenv result. */
+ javatz = strdup(tz);
+ } else if (freetz != tz) {
+ /* strdup and free the old buffer, if we moved the pointer. */
+ javatz = strdup(tz);
+ free((void *) freetz);
+ } else {
+ /* we are good if we already work on a freshly allocated buffer. */
+ javatz = tz;
+ }
+#endif
+ }
+
+ return javatz;
+}
+
+/**
+ * Returns a GMT-offset-based zone ID. (e.g., "GMT-08:00")
+ */
+
+#if defined(MACOSX)
+
+char *
+getGMTOffsetID()
+{
+ time_t offset;
+ char sign, buf[32];
+ struct tm local_tm;
+ time_t clock;
+
+ clock = time(NULL);
+ if (localtime_r(&clock, &local_tm) == NULL) {
+ return strdup("GMT");
+ }
+ offset = (time_t)local_tm.tm_gmtoff;
+ if (offset == 0) {
+ return strdup("GMT");
+ }
+ if (offset > 0) {
+ sign = '+';
+ } else {
+ offset = -offset;
+ sign = '-';
+ }
+ sprintf(buf, (const char *)"GMT%c%02d:%02d",
+ sign, (int)(offset/3600), (int)((offset%3600)/60));
+ return strdup(buf);
+}
+
+#else
+
+char *
+getGMTOffsetID()
+{
+ time_t offset;
+ char sign, buf[32];
+#if defined(__solaris__)
+ struct tm localtm;
+ time_t currenttime;
+
+ currenttime = time(NULL);
+ if (localtime_r(¤ttime, &localtm) == NULL) {
+ return strdup("GMT");
+ }
+
+ offset = localtm.tm_isdst ? altzone : timezone;
+#else
+ offset = timezone;
+#endif
+
+ if (offset == 0) {
+ return strdup("GMT");
+ }
+
+ /* Note that the time offset direction is opposite. */
+ if (offset > 0) {
+ sign = '-';
+ } else {
+ offset = -offset;
+ sign = '+';
+ }
+ sprintf(buf, (const char *)"GMT%c%02d:%02d",
+ sign, (int)(offset/3600), (int)((offset%3600)/60));
+ return strdup(buf);
+}
+#endif /* MACOSX */