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-rw-r--r--libical/ChangeLog8
-rw-r--r--libical/src/libical/icaltime.c62
2 files changed, 51 insertions, 19 deletions
diff --git a/libical/ChangeLog b/libical/ChangeLog
index 6d116aa4a3..dc5a51af9a 100644
--- a/libical/ChangeLog
+++ b/libical/ChangeLog
@@ -1,3 +1,11 @@
+2001-01-24 Damon Chaplin <damon@helixcode.com>
+
+ * src/libical/icaltime.c (set_tz):
+ (unset_tz): rewrote to fix problems with freeing the environment
+ string after calling putenv() and to fix memory leaks. (We save a
+ pointer to the last TZ env var we set, so we free it after the next
+ time we set TZ.)
+
2001-01-23 JP Rosevear <jpr@ximian.com>
* configure.in: Don't AC_INIT on an autogenerated file that does not
diff --git a/libical/src/libical/icaltime.c b/libical/src/libical/icaltime.c
index 22212a801b..81f2de6835 100644
--- a/libical/src/libical/icaltime.c
+++ b/libical/src/libical/icaltime.c
@@ -74,37 +74,56 @@ icaltime_from_timet(time_t tm, int is_date)
return tt;
}
+/* This will hold the last "TZ=XXX" string we used with putenv(). After we
+ call putenv() again to set a new TZ string, we can free the previous one.
+ As far as I know, no libc implementations actually free the memory used in
+ the environment variables (how could they know if it is a static string or
+ a malloc'ed string?), so we have to free it ourselves. */
+static char* saved_tz = NULL;
+
+
+/* If you use set_tz(), you must call unset_tz() some time later to restore the
+ original TZ. Pass unset_tz() the string that set_tz() returns. */
char* set_tz(const char* tzid)
{
- char *tzstr = 0;
- char *tmp;
+ char *old_tz, *old_tz_copy = NULL, *new_tz;
- /* Put the new time zone into the environment */
- if(getenv("TZ") != 0){
- tzstr = (char*)strdup(getenv("TZ"));
+ /* Get the old TZ setting and save a copy of it to return. */
+ old_tz = getenv("TZ");
+ if(old_tz){
+ old_tz_copy = (char*)malloc(strlen (old_tz) + 4);
- if(tzstr == 0){
+ if(old_tz_copy == 0){
icalerror_set_errno(ICAL_NEWFAILED_ERROR);
return 0;
}
+
+ strcpy (old_tz_copy, "TZ=");
+ strcpy (old_tz_copy + 3, old_tz);
}
- tmp = (char*)malloc(1024);
+ /* Create the new TZ string. */
+ new_tz = (char*)malloc(strlen (tzid) + 4);
- if(tmp == 0){
+ if(new_tz == 0){
icalerror_set_errno(ICAL_NEWFAILED_ERROR);
return 0;
}
- snprintf(tmp,1024,"TZ=%s",tzid);
+ strcpy (new_tz, "TZ=");
+ strcpy (new_tz + 3, tzid);
- /* HACK. In some libc versions, putenv gives the string to the
- system and in some it gives a copy, so the following might be a
- memory leak. THe linux man page says that glibc2.1.2 take
- ownership ( no leak) while BSD4.4 uses a copy ( A leak ) */
- putenv(tmp);
+ /* Add the new TZ to the environment. */
+ putenv(new_tz);
- return tzstr; /* This will be zero if the TZ env var was not set */
+ /* Free any previous TZ environment string we have used. */
+ if (saved_tz)
+ free (saved_tz);
+
+ /* Save a pointer to the TZ string we just set, so we can free it later. */
+ saved_tz = new_tz;
+
+ return old_tz_copy; /* This will be zero if the TZ env var was not set */
}
void unset_tz(char* tzstr)
@@ -112,13 +131,18 @@ void unset_tz(char* tzstr)
/* restore the original environment */
if(tzstr!=0){
- char temp[1024];
- snprintf(temp,1024,"TZ=%s",tzstr);
- putenv(temp);
- free(tzstr);
+ putenv(tzstr);
} else {
putenv("TZ"); /* Delete from environment */
}
+
+ /* Free any previous TZ environment string we have used. */
+ if (saved_tz)
+ free (saved_tz);
+
+ /* Save a pointer to the TZ string we just set, so we can free it later.
+ (This can possibly be NULL if there was no TZ to restore.) */
+ saved_tz = tzstr;
}
time_t icaltime_as_timet(struct icaltimetype tt)