8 #include "locale_impl.h"
10 #include "time_impl.h"
12 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 size_t __strftime_l(char *restrict, size_t, const char *restrict, const struct tm *restrict, locale_t);
50 const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc, int pad)
54 const char *fmt = "-";
55 int width = 2, def_pad = '0';
59 if (tm->tm_wday > 6U) goto string;
60 item = ABDAY_1 + tm->tm_wday;
63 if (tm->tm_wday > 6U) goto string;
64 item = DAY_1 + tm->tm_wday;
68 if (tm->tm_mon > 11U) goto string;
69 item = ABMON_1 + tm->tm_mon;
72 if (tm->tm_mon > 11U) goto string;
73 item = MON_1 + tm->tm_mon;
79 val = (1900LL+tm->tm_year) / 100;
94 val = tm->tm_year + 1900LL;
95 if (tm->tm_yday < 3 && week_num(tm) != 1) val--;
96 else if (tm->tm_yday > 360 && week_num(tm) == 1) val++;
97 if (f=='g') val %= 100;
106 else if (val > 12) val -= 12;
122 item = tm->tm_hour >= 12 ? PM_STR : AM_STR;
131 val = __tm_to_secs(tm) - tm->__tm_gmtoff;
144 val = tm->tm_wday ? tm->tm_wday : 7;
148 val = (tm->tm_yday + 7U - tm->tm_wday) / 7;
151 val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
167 val = (tm->tm_year + 1900LL) % 100;
168 if (val < 0) val = -val;
171 val = tm->tm_year + 1900LL;
173 *l = snprintf(*s, sizeof *s, "+%lld", val);
179 if (tm->tm_isdst < 0) {
183 *l = snprintf(*s, sizeof *s, "%+.4ld",
184 tm->__tm_gmtoff/3600*100 + tm->__tm_gmtoff%3600/60);
187 if (tm->tm_isdst < 0) {
191 fmt = __tm_to_tzname(tm);
200 switch (pad ? pad : def_pad) {
201 case '-': *l = snprintf(*s, sizeof *s, "%lld", val); break;
202 case '_': *l = snprintf(*s, sizeof *s, "%*lld", width, val); break;
204 default: *l = snprintf(*s, sizeof *s, "%0*lld", width, val); break;
208 fmt = __nl_langinfo_l(item, loc);
213 fmt = __nl_langinfo_l(item, loc);
215 *l = __strftime_l(*s, sizeof *s, fmt, tm, loc);
220 size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm, locale_t loc)
228 for (l=0; l<n; f++) {
239 if (*f == '-' || *f == '_' || *f == '0') pad = *f++;
240 if ((plus = (*f == '+'))) f++;
241 width = strtoul(f, &p, 10);
242 if (*p == 'C' || *p == 'F' || *p == 'G' || *p == 'Y') {
243 if (!width && p!=f) width = 1;
248 if (*f == 'E' || *f == 'O') f++;
249 t = __strftime_fmt_1(&buf, &k, *f, tm, loc, pad);
252 /* Trim off any sign and leading zeros, then
253 * count remaining digits to determine behavior
255 if (*t=='+' || *t=='-') t++, k--;
256 for (; *t=='0' && t[1]-'0'<10U; t++, k--);
257 if (width < k) width = k;
259 for (d=0; t[d]-'0'<10U; d++);
260 if (tm->tm_year < -1900) {
263 } else if (plus && d+(width-k) >= (*p=='C'?3:5)) {
267 for (; width > k && l < n; width--)
270 if (k > n-l) k = n-l;
281 size_t strftime(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm)
283 return __strftime_l(s, n, f, tm, CURRENT_LOCALE);
286 weak_alias(__strftime_l, strftime_l);