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time.c
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time.c
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/**********************************************************************
time.c -
$Author$
$Date$
created at: Tue Dec 28 14:31:59 JST 1993
Copyright (C) 1993-2000 Yukihiro Matsumoto
**********************************************************************/
#include "ruby.h"
#include <sys/types.h>
#include <time.h>
#ifndef NT
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#else
#define time_t long
struct timeval {
time_t tv_sec; /* seconds */
time_t tv_usec; /* and microseconds */
};
#endif
#endif /* NT */
#ifdef HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
VALUE rb_cTime;
#if defined(HAVE_TIMES) || defined(NT)
static VALUE S_Tms;
#endif
struct time_object {
struct timeval tv;
struct tm tm;
int gmt;
int tm_got;
};
#define GetTimeval(obj, tobj) {\
Data_Get_Struct(obj, struct time_object, tobj);\
}
static VALUE
time_s_now(klass)
VALUE klass;
{
VALUE obj;
struct time_object *tobj;
obj = Data_Make_Struct(klass, struct time_object, 0, free, tobj);
tobj->tm_got=0;
if (gettimeofday(&tobj->tv, 0) < 0) {
rb_sys_fail("gettimeofday");
}
return obj;
}
static VALUE
time_s_new(argc, argv, klass)
int argc;
VALUE *argv;
VALUE klass;
{
VALUE obj = time_s_now(klass);
rb_obj_call_init(obj, argc, argv);
return obj;
}
static VALUE
time_new_internal(klass, sec, usec)
VALUE klass;
time_t sec, usec;
{
VALUE obj;
struct time_object *tobj;
if (usec >= 1000000) { /* usec overflow */
sec += usec / 1000000;
usec %= 1000000;
}
while (usec < 0) { /* usec underflow */
sec--;
usec += 1000000;
}
if (sec < 0 || (sec == 0 && usec < 0))
rb_raise(rb_eArgError, "time must be positive");
obj = Data_Make_Struct(klass, struct time_object, 0, free, tobj);
tobj->tm_got = 0;
tobj->tv.tv_sec = sec;
tobj->tv.tv_usec = usec;
return obj;
}
VALUE
rb_time_new(sec, usec)
time_t sec, usec;
{
return time_new_internal(rb_cTime, sec, usec);
}
static struct timeval
time_timeval(time, interval)
VALUE time;
int interval;
{
struct timeval t;
switch (TYPE(time)) {
case T_FIXNUM:
t.tv_sec = FIX2LONG(time);
if (t.tv_sec < 0)
rb_raise(rb_eArgError, "time must be positive");
t.tv_usec = 0;
break;
case T_FLOAT:
if (RFLOAT(time)->value < 0.0)
rb_raise(rb_eArgError, "time must be positive");
t.tv_sec = (time_t)RFLOAT(time)->value;
t.tv_usec = (time_t)((RFLOAT(time)->value - (double)t.tv_sec)*1e6);
break;
case T_BIGNUM:
t.tv_sec = NUM2LONG(time);
if (t.tv_sec < 0)
rb_raise(rb_eArgError, "time must be positive");
t.tv_usec = 0;
break;
default:
rb_raise(rb_eTypeError, "can't convert %s into Time%s",
rb_class2name(CLASS_OF(time)),
interval ? " interval" : "");
break;
}
return t;
}
struct timeval
rb_time_interval(time)
VALUE time;
{
return time_timeval(time, Qtrue);
}
struct timeval
rb_time_timeval(time)
VALUE time;
{
struct time_object *tobj;
struct timeval t;
if (rb_obj_is_kind_of(time, rb_cTime)) {
GetTimeval(time, tobj);
t = tobj->tv;
return t;
}
return time_timeval(time, Qfalse);
}
static VALUE
time_s_at(argc, argv, klass)
int argc;
VALUE *argv;
VALUE klass;
{
struct timeval tv;
VALUE time, t;
if (rb_scan_args(argc, argv, "11", &time, &t) == 2) {
tv.tv_sec = NUM2INT(time);
tv.tv_usec = NUM2INT(t);
}
else {
tv = rb_time_timeval(time);
}
t = time_new_internal(klass, tv.tv_sec, tv.tv_usec);
if (TYPE(time) == T_DATA) {
struct time_object *tobj, *tobj2;
GetTimeval(time, tobj);
GetTimeval(t, tobj2);
tobj2->gmt = tobj->gmt;
}
return t;
}
static char *months [12] = {
"jan", "feb", "mar", "apr", "may", "jun",
"jul", "aug", "sep", "oct", "nov", "dec",
};
static long
obj2long(obj)
VALUE obj;
{
if (TYPE(obj) == T_STRING) {
obj = rb_str2inum(obj, 10);
}
return NUM2LONG(obj);
}
static void
time_arg(argc, argv, tm, usec)
int argc;
VALUE *argv;
struct tm *tm;
time_t *usec;
{
VALUE v[7];
int i;
MEMZERO(tm, struct tm, 1);
if (argc == 10) {
v[0] = argv[5];
v[1] = argv[4];
v[2] = argv[3];
v[3] = argv[2];
v[4] = argv[1];
v[5] = argv[0];
*usec = 0;
tm->tm_isdst = RTEST(argv[8]) ? 1 : 0;
}
else {
rb_scan_args(argc, argv, "16", &v[0],&v[1],&v[2],&v[3],&v[4],&v[5],&v[6]);
*usec = NIL_P(v[6]) ? 0 : obj2long(v[6]);
tm->tm_isdst = -1;
}
tm->tm_year = obj2long(v[0]);
if (0 <= tm->tm_year && tm->tm_year < 69) tm->tm_year += 100;
if (tm->tm_year >= 1900) tm->tm_year -= 1900;
if (NIL_P(v[1])) {
tm->tm_mon = 0;
}
else if (TYPE(v[1]) == T_STRING) {
tm->tm_mon = -1;
for (i=0; i<12; i++) {
if (RSTRING(v[1])->len == 3 &&
strcasecmp(months[i], RSTRING(v[1])->ptr) == 0) {
tm->tm_mon = i;
break;
}
}
if (tm->tm_mon == -1) {
char c = RSTRING(v[1])->ptr[0];
if ('0' <= c && c <= '9') {
tm->tm_mon = obj2long(v[1])-1;
}
}
}
else {
tm->tm_mon = obj2long(v[1]) - 1;
}
if (NIL_P(v[2])) {
tm->tm_mday = 1;
}
else {
tm->tm_mday = obj2long(v[2]);
}
tm->tm_hour = NIL_P(v[3])?0:obj2long(v[3]);
tm->tm_min = NIL_P(v[4])?0:obj2long(v[4]);
tm->tm_sec = NIL_P(v[5])?0:obj2long(v[5]);
/* value validation */
if ( tm->tm_year < 69
|| tm->tm_mon < 0 || tm->tm_mon > 11
|| tm->tm_mday < 1 || tm->tm_mday > 31
|| tm->tm_hour < 0 || tm->tm_hour > 23
|| tm->tm_min < 0 || tm->tm_min > 59
|| tm->tm_sec < 0 || tm->tm_sec > 60)
rb_raise(rb_eArgError, "argument out of range");
}
static VALUE time_gmtime _((VALUE));
static VALUE time_localtime _((VALUE));
static VALUE time_get_tm _((VALUE, int));
static time_t
make_time_t(tptr, utc_or_local)
struct tm *tptr;
int utc_or_local;
{
struct timeval tv;
time_t oguess, guess;
struct tm *tm;
long t, diff;
if (gettimeofday(&tv, 0) < 0) {
rb_sys_fail("gettimeofday");
}
guess = tv.tv_sec;
tm = gmtime(&guess);
if (!tm) goto error;
t = tptr->tm_year;
if (t < 69) goto out_of_range;
while (diff = t - tm->tm_year) {
oguess = guess;
guess += diff * 363 * 24 * 3600;
if (diff > 0 && guess <= oguess) goto out_of_range;
tm = gmtime(&guess);
if (!tm) goto error;
}
t = tptr->tm_mon;
while (diff = t - tm->tm_mon) {
guess += diff * 27 * 24 * 3600;
tm = gmtime(&guess);
if (!tm) goto error;
if (tptr->tm_year != tm->tm_year) goto out_of_range;
}
guess += (tptr->tm_mday - tm->tm_mday) * 24 * 3600;
guess += (tptr->tm_hour - tm->tm_hour) * 3600;
guess += (tptr->tm_min - tm->tm_min) * 60;
guess += (tptr->tm_sec - tm->tm_sec);
if (guess < 0) goto out_of_range;
if (!utc_or_local) { /* localtime zone adjust */
struct tm gt, lt;
long tzsec;
t = 0;
tm = gmtime(&guess);
if (!tm) goto error;
gt = *tm;
tm = localtime(&guess);
if (!tm) goto error;
lt = *tm;
tzsec = (gt.tm_min-lt.tm_min)*60 + (gt.tm_hour-lt.tm_hour)*3600;
if (lt.tm_year > gt.tm_year) {
tzsec -= 24*3600;
}
else if(gt.tm_year > lt.tm_year) {
tzsec += 24*3600;
}
else {
tzsec += (gt.tm_yday - lt.tm_yday)*24*3600;
}
if (lt.tm_isdst) guess += 3600;
guess += tzsec;
if (guess < 0) {
goto out_of_range;
}
tm = localtime(&guess);
if (!tm) goto error;
if (lt.tm_isdst != tm->tm_isdst || tptr->tm_hour != tm->tm_hour) {
time_t tmp = guess - 3600;
tm = localtime(&tmp);
if (!tm) goto error;
if (tptr->tm_hour == tm->tm_hour) {
guess = tmp;
}
else if (lt.tm_isdst == tm->tm_isdst) {
tmp = guess + 3600;
tm = localtime(&tmp);
if (!tm) goto error;
if (tptr->tm_hour == tm->tm_hour) {
guess = tmp;
}
}
}
if (guess < 0) {
goto out_of_range;
}
}
return guess;
out_of_range:
rb_raise(rb_eArgError, "time out of range");
error:
rb_raise(rb_eArgError, "gmtime/localtime error");
return 0; /* not reached */
}
static VALUE
time_utc_or_local(argc, argv, utc_p, klass)
int argc;
VALUE *argv;
int utc_p;
VALUE klass;
{
struct tm tm;
VALUE time;
time_t usec;
time_arg(argc, argv, &tm, &usec);
time = time_new_internal(klass, make_time_t(&tm, utc_p), usec);
if (utc_p) return time_gmtime(time);
return time_localtime(time);
}
static VALUE
time_s_mkutc(argc, argv, klass)
int argc;
VALUE *argv;
VALUE klass;
{
return time_utc_or_local(argc, argv, Qtrue, klass);
}
static VALUE
time_s_mktime(argc, argv, klass)
int argc;
VALUE *argv;
VALUE klass;
{
return time_utc_or_local(argc, argv, Qfalse, klass);
}
static VALUE
time_to_i(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
return INT2NUM(tobj->tv.tv_sec);
}
static VALUE
time_to_f(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
return rb_float_new((double)tobj->tv.tv_sec+(double)tobj->tv.tv_usec/1e6);
}
static VALUE
time_usec(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
return INT2NUM(tobj->tv.tv_usec);
}
static VALUE
time_cmp(time1, time2)
VALUE time1, time2;
{
struct time_object *tobj1, *tobj2;
long i;
GetTimeval(time1, tobj1);
switch (TYPE(time2)) {
case T_FIXNUM:
i = FIX2LONG(time2);
if (tobj1->tv.tv_sec == i) {
if (tobj1->tv.tv_usec == 0)
return INT2FIX(0);
if (tobj1->tv.tv_usec > 0)
return INT2FIX(1);
return INT2FIX(-1);
}
if (tobj1->tv.tv_sec > i) return INT2FIX(1);
return INT2FIX(-1);
case T_FLOAT:
{
double t;
t = (double)tobj1->tv.tv_sec + (double)tobj1->tv.tv_usec*1e-6;
if (t > RFLOAT(time2)->value)
return INT2FIX(1);
if (t < RFLOAT(time2)->value)
return INT2FIX(-1);
return INT2FIX(0);
}
}
if (rb_obj_is_kind_of(time2, rb_cTime)) {
GetTimeval(time2, tobj2);
if (tobj1->tv.tv_sec == tobj2->tv.tv_sec) {
if (tobj1->tv.tv_usec == tobj2->tv.tv_usec) return INT2FIX(0);
if (tobj1->tv.tv_usec > tobj2->tv.tv_usec) return INT2FIX(1);
return INT2FIX(-1);
}
if (tobj1->tv.tv_sec > tobj2->tv.tv_sec) return INT2FIX(1);
return INT2FIX(-1);
}
if (TYPE(time2) == T_BIGNUM) {
double a = (double)tobj1->tv.tv_sec+(double)tobj1->tv.tv_usec/1e6;
double b = rb_big2dbl(time2);
if (a == b) return INT2FIX(0);
if (a > b) return INT2FIX(1);
if (a < b) return INT2FIX(-1);
}
i = NUM2LONG(time2);
if (tobj1->tv.tv_sec == i) {
if (tobj1->tv.tv_usec == 0)
return INT2FIX(0);
if (tobj1->tv.tv_usec > 0)
return INT2FIX(1);
return INT2FIX(-1);
}
if (tobj1->tv.tv_sec > i) return INT2FIX(1);
return INT2FIX(-1);
}
static VALUE
time_eql(time1, time2)
VALUE time1, time2;
{
struct time_object *tobj1, *tobj2;
GetTimeval(time1, tobj1);
if (rb_obj_is_kind_of(time2, rb_cTime)) {
GetTimeval(time2, tobj2);
if (tobj1->tv.tv_sec == tobj2->tv.tv_sec) {
if (tobj1->tv.tv_usec == tobj2->tv.tv_usec) return Qtrue;
}
}
return Qfalse;
}
static VALUE
time_utc_p(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->gmt) return Qtrue;
return Qfalse;
}
static VALUE
time_hash(time)
VALUE time;
{
struct time_object *tobj;
long hash;
GetTimeval(time, tobj);
hash = tobj->tv.tv_sec ^ tobj->tv.tv_usec;
return INT2FIX(hash);
}
static VALUE
time_clone(time)
VALUE time;
{
VALUE clone;
struct time_object *tobj, *tclone;
GetTimeval(time, tobj);
clone = Data_Make_Struct(0, struct time_object, 0, free, tclone);
CLONESETUP(clone, time);
MEMCPY(tclone, tobj, struct time_object, 1);
return clone;
}
static void
time_modify(time)
VALUE time;
{
if (OBJ_FROZEN(time)) rb_error_frozen("Time");
if (!OBJ_TAINTED(time) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't modify Time");
}
static VALUE
time_localtime(time)
VALUE time;
{
struct time_object *tobj;
struct tm *tm_tmp;
time_t t;
GetTimeval(time, tobj);
if (!tobj->gmt) {
if (tobj->tm_got)
return time;
}
else {
time_modify(time);
}
t = tobj->tv.tv_sec;
tm_tmp = localtime(&t);
tobj->tm = *tm_tmp;
tobj->tm_got = 1;
tobj->gmt = 0;
return time;
}
static VALUE
time_gmtime(time)
VALUE time;
{
struct time_object *tobj;
struct tm *tm_tmp;
time_t t;
GetTimeval(time, tobj);
if (tobj->gmt) {
if (tobj->tm_got)
return time;
}
else {
time_modify(time);
}
t = tobj->tv.tv_sec;
tm_tmp = gmtime(&t);
tobj->tm = *tm_tmp;
tobj->tm_got = 1;
tobj->gmt = 1;
return time;
}
static VALUE
time_get_tm(time, gmt)
VALUE time;
int gmt;
{
if (gmt) return time_gmtime(time);
return time_localtime(time);
}
static VALUE
time_asctime(time)
VALUE time;
{
struct time_object *tobj;
char *s;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
s = asctime(&tobj->tm);
if (s[24] == '\n') s[24] = '\0';
return rb_str_new2(s);
}
static VALUE
time_to_s(time)
VALUE time;
{
struct time_object *tobj;
char buf[128];
int len;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
if (tobj->gmt == 1) {
len = strftime(buf, 128, "%a %b %d %H:%M:%S UTC %Y", &tobj->tm);
}
else {
len = strftime(buf, 128, "%a %b %d %H:%M:%S %Z %Y", &tobj->tm);
}
return rb_str_new(buf, len);
}
static VALUE
time_plus(time1, time2)
VALUE time1, time2;
{
struct time_object *tobj;
time_t sec, usec;
double f;
GetTimeval(time1, tobj);
if (rb_obj_is_kind_of(time2, rb_cTime)) {
rb_raise(rb_eTypeError, "time + time?");
}
f = NUM2DBL(time2);
sec = (time_t)f;
usec = tobj->tv.tv_usec + (time_t)((f - (double)sec)*1e6);
sec = tobj->tv.tv_sec + sec;
time2 = rb_time_new(sec, usec);
if (tobj->gmt) {
GetTimeval(time2, tobj);
tobj->gmt = 1;
}
return time2;
}
static VALUE
time_minus(time1, time2)
VALUE time1, time2;
{
struct time_object *tobj;
time_t sec, usec;
double f;
GetTimeval(time1, tobj);
if (rb_obj_is_kind_of(time2, rb_cTime)) {
struct time_object *tobj2;
GetTimeval(time2, tobj2);
f = tobj->tv.tv_sec - tobj2->tv.tv_sec;
f += (tobj->tv.tv_usec - tobj2->tv.tv_usec)*1e-6;
return rb_float_new(f);
}
else {
f = NUM2DBL(time2);
sec = (time_t)f;
usec = tobj->tv.tv_usec - (time_t)((f - (double)sec)*1e6);
sec = tobj->tv.tv_sec - sec;
}
time2 = rb_time_new(sec, usec);
if (tobj->gmt) {
GetTimeval(time2, tobj);
tobj->gmt = 1;
}
return time2;
}
static VALUE
time_sec(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
return INT2FIX(tobj->tm.tm_sec);
}
static VALUE
time_min(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
return INT2FIX(tobj->tm.tm_min);
}
static VALUE
time_hour(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
return INT2FIX(tobj->tm.tm_hour);
}
static VALUE
time_mday(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
return INT2FIX(tobj->tm.tm_mday);
}
static VALUE
time_mon(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
return INT2FIX(tobj->tm.tm_mon+1);
}
static VALUE
time_year(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
return INT2FIX(tobj->tm.tm_year+1900);
}
static VALUE
time_wday(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
return INT2FIX(tobj->tm.tm_wday);
}
static VALUE
time_yday(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
return INT2FIX(tobj->tm.tm_yday+1);
}
static VALUE
time_isdst(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
return tobj->tm.tm_isdst?Qtrue:Qfalse;
}
static VALUE
time_zone(time)
VALUE time;
{
struct time_object *tobj;
char buf[64];
int len;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
#if defined(HAVE_TM_ZONE)
return rb_str_new2(tobj->tm.tm_zone);
#elif defined(HAVE_TZNAME) && defined(HAVE_DAYLIGHT)
return rb_str_new2(tzname[daylight && tobj->tm.tm_isdst]);
#else
len = strftime(buf, 64, "%Z", &tobj->tm);
return rb_str_new(buf, len);
#endif
}
static VALUE
time_utc_offset(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
if (tobj->gmt == 1) {
return INT2FIX(0);
}
else {
#if defined(HAVE_STRUCT_TM_TM_GMTOFF)
return INT2NUM(tobj->tm.tm_gmtoff);
#else
struct tm *u, *l;
time_t t;
int off;
l = &tobj->tm;
t = tobj->tv.tv_sec;
u = gmtime(&t);
if (!u)
rb_raise(rb_eArgError, "gmtime error");
if (l->tm_year != u->tm_year)
off = l->tm_year < u->tm_year ? -1 : 1;
else if (l->tm_mon != u->tm_mon)
off = l->tm_mon < u->tm_mon ? -1 : 1;
else if (l->tm_mday != u->tm_mday)
off = l->tm_mday < u->tm_mday ? -1 : 1;
else
off = 0;
off = off * 24 + l->tm_hour - u->tm_hour;
off = off * 60 + l->tm_min - u->tm_min;
off = off * 60 + l->tm_sec - u->tm_sec;
return INT2FIX(off);
#endif
}
}
static VALUE
time_to_a(time)
VALUE time;
{
struct time_object *tobj;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
return rb_ary_new3(10,
INT2FIX(tobj->tm.tm_sec),
INT2FIX(tobj->tm.tm_min),
INT2FIX(tobj->tm.tm_hour),
INT2FIX(tobj->tm.tm_mday),
INT2FIX(tobj->tm.tm_mon+1),
INT2FIX(tobj->tm.tm_year+1900),
INT2FIX(tobj->tm.tm_wday),
INT2FIX(tobj->tm.tm_yday+1),
tobj->tm.tm_isdst?Qtrue:Qfalse,
time_zone(time));
}
#define SMALLBUF 100
static int
rb_strftime(buf, format, time)
char ** volatile buf;
char * volatile format;
struct tm * volatile time;
{
volatile int size;
int len, flen;
(*buf)[0] = '\0';
flen = strlen(format);
if (flen == 0) {
return 0;
}
len = strftime(*buf, SMALLBUF, format, time);
if (len != 0 || **buf == '\0') return len;
for (size=1024; ; size*=2) {
*buf = xmalloc(size);
(*buf)[0] = '\0';
len = strftime(*buf, size, format, time);
/*
* buflen can be zero EITHER because there's not enough
* room in the string, or because the control command
* goes to the empty string. Make a reasonable guess that
* if the buffer is 1024 times bigger than the length of the
* format string, it's not failing for lack of room.
*/
if (len > 0 || size >= 1024 * flen) return len;
free(*buf);
}
/* not reached */
}
static VALUE
time_strftime(time, format)
VALUE time, format;
{
struct time_object *tobj;
char buffer[SMALLBUF];
char *fmt;
char *buf = buffer;
int len;
VALUE str;
GetTimeval(time, tobj);
if (tobj->tm_got == 0) {
time_get_tm(time, tobj->gmt);
}
fmt = rb_str2cstr(format, &len);
if (len == 0) {
rb_warning("strftime called with empty format string");
}
if (strlen(fmt) < len) {
/* Ruby string may contain \0's. */