8 #include "locale_impl.h"
10 #include "time_impl.h"
12 const char *__nl_langinfo_l(nl_item, locale_t);
14 static int is_leap(int y)
17 if (y>INT_MAX-1900) y -= 2000;
19 return !(y%4) && ((y%100) || !(y%400));
22 static int week_num(const struct tm *tm)
24 int val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
25 /* If 1 Jan is just 1-3 days past Monday,
26 * the previous week is also in this year. */
27 if ((tm->tm_wday + 371U - tm->tm_yday - 2) % 7 <= 2)
31 /* If 31 December of prev year a Thursday,
32 * or Friday of a leap year, then the
33 * prev year has 53 weeks. */
34 int dec31 = (tm->tm_wday + 7U - tm->tm_yday - 1) % 7;
35 if (dec31 == 4 || (dec31 == 5 && is_leap(tm->tm_year%400-1)))
37 } else if (val == 53) {
38 /* If 1 January is not a Thursday, and not
39 * a Wednesday of a leap year, then this
40 * year has only 52 weeks. */
41 int jan1 = (tm->tm_wday + 371U - tm->tm_yday) % 7;
42 if (jan1 != 4 && (jan1 != 3 || !is_leap(tm->tm_year)))
48 const char *__tm_to_tzname(const struct tm *);
49 size_t __strftime_l(char *restrict, size_t, const char *restrict, const struct tm *restrict, locale_t);
51 const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc)
55 const char *fmt = "-";
60 if (tm->tm_wday > 6U) goto string;
61 item = ABDAY_1 + tm->tm_wday;
64 if (tm->tm_wday > 6U) goto string;
65 item = DAY_1 + tm->tm_wday;
69 if (tm->tm_mon > 11U) goto string;
70 item = ABMON_1 + tm->tm_mon;
73 if (tm->tm_mon > 11U) goto string;
74 item = MON_1 + tm->tm_mon;
80 val = (1900LL+tm->tm_year) / 100;
89 *l = snprintf(*s, sizeof *s, "%2d", tm->tm_mday);
96 val = tm->tm_year + 1900LL;
97 if (tm->tm_yday < 3 && week_num(tm) != 1) val--;
98 else if (tm->tm_yday > 360 && week_num(tm) == 1) val++;
99 if (f=='g') val %= 100;
108 else if (val > 12) val -= 12;
124 item = tm->tm_hour >= 12 ? PM_STR : AM_STR;
133 val = __tm_to_secs(tm) - tm->__tm_gmtoff;
146 val = tm->tm_wday ? tm->tm_wday : 7;
150 val = (tm->tm_yday + 7U - tm->tm_wday) / 7;
153 val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
169 val = tm->tm_year % 100;
172 val = tm->tm_year + 1900LL;
174 *l = snprintf(*s, sizeof *s, "+%lld", val);
180 if (tm->tm_isdst < 0) {
184 *l = snprintf(*s, sizeof *s, "%+.2d%.2d",
185 (tm->__tm_gmtoff)/3600,
186 abs(tm->__tm_gmtoff%3600)/60);
189 if (tm->tm_isdst < 0) {
193 fmt = __tm_to_tzname(tm);
202 *l = snprintf(*s, sizeof *s, "%0*lld", width, val);
205 fmt = __nl_langinfo_l(item, loc);
210 fmt = __nl_langinfo_l(item, loc);
212 *l = __strftime_l(*s, sizeof *s, fmt, tm, loc);
217 size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm, locale_t loc)
225 for (l=0; l<n; f++) {
235 if ((plus = (*f == '+'))) f++;
236 width = strtoul(f, &p, 10);
237 if (*p == 'C' || *p == 'F' || *p == 'G' || *p == 'Y') {
238 if (!width && p!=f) width = 1;
243 if (*f == 'E' || *f == 'O') f++;
244 t = __strftime_fmt_1(&buf, &k, *f, tm, loc);
247 for (; *t=='+' || *t=='-' || (*t=='0'&&t[1]); t++, k--);
249 if (plus && tm->tm_year >= 10000-1900)
251 else if (tm->tm_year < -1900)
255 for (; width > k && l < n; width--)
258 if (k > n-l) k = n-l;
269 size_t strftime(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm)
271 return __strftime_l(s, n, f, tm, CURRENT_LOCALE);
274 weak_alias(__strftime_l, strftime_l);