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zdump: use TM_ZONE if available

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* zdump.c (abbr): Return pointer-to-const.  Use TM_ZONE if
available, as it's simpler, more reliable, and a tad faster.
This commit is contained in:
Paul Eggert
2014-08-25 08:20:52 -07:00
parent f50d254594
commit d0aac72175
1 changed files with 10 additions and 9 deletions
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zdump.c
+10 -9
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@@ -225,7 +225,7 @@ static char * progname;
static bool warned;
static bool errout;
static char *abbr(struct tm const *);
static char const *abbr(struct tm const *);
static intmax_t delta(struct tm *, struct tm *) ATTRIBUTE_PURE;
static void dumptime(struct tm const *);
static time_t hunt(char *, time_t, time_t);
@@ -738,16 +738,17 @@ show(char *zone, time_t t, bool v)
abbrok(abbr(tmp), zone);
}
static char *
static char const *
abbr(struct tm const *tmp)
{
register char * result;
static char nada;
if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
return &nada;
result = tzname[tmp->tm_isdst];
return (result == NULL) ? &nada : result;
#ifdef TM_ZONE
return tmp->TM_ZONE;
#else
return ((0 <= tmp->tm_isdst && tmp->tm_isdst <= 1
&& tzname[tmp->tm_isdst])
? tzname[tmp->tm_isdst]
: "");
#endif
}
/*