1 | #include <stdio.h>
|
---|
2 | #include <stdlib.h>
|
---|
3 | #include <string.h>
|
---|
4 | #include <langinfo.h>
|
---|
5 | #include <locale.h>
|
---|
6 | #include <time.h>
|
---|
7 | #include <limits.h>
|
---|
8 | #include "locale_impl.h"
|
---|
9 | #include "libc.h"
|
---|
10 | #include "time_impl.h"
|
---|
11 |
|
---|
12 | const char *__nl_langinfo_l(nl_item, locale_t);
|
---|
13 |
|
---|
14 | static int is_leap(int y)
|
---|
15 | {
|
---|
16 | /* Avoid overflow */
|
---|
17 | if (y>INT_MAX-1900) y -= 2000;
|
---|
18 | y += 1900;
|
---|
19 | return !(y%4) && ((y%100) || !(y%400));
|
---|
20 | }
|
---|
21 |
|
---|
22 | static int week_num(const struct tm *tm)
|
---|
23 | {
|
---|
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)
|
---|
28 | val++;
|
---|
29 | if (!val) {
|
---|
30 | val = 52;
|
---|
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)))
|
---|
36 | val++;
|
---|
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)))
|
---|
43 | val = 1;
|
---|
44 | }
|
---|
45 | return val;
|
---|
46 | }
|
---|
47 |
|
---|
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);
|
---|
50 |
|
---|
51 | const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc)
|
---|
52 | {
|
---|
53 | nl_item item;
|
---|
54 | long long val;
|
---|
55 | const char *fmt = "-";
|
---|
56 | int width = 2;
|
---|
57 |
|
---|
58 | switch (f) {
|
---|
59 | case 'a':
|
---|
60 | if (tm->tm_wday > 6U) goto string;
|
---|
61 | item = ABDAY_1 + tm->tm_wday;
|
---|
62 | goto nl_strcat;
|
---|
63 | case 'A':
|
---|
64 | if (tm->tm_wday > 6U) goto string;
|
---|
65 | item = DAY_1 + tm->tm_wday;
|
---|
66 | goto nl_strcat;
|
---|
67 | case 'h':
|
---|
68 | case 'b':
|
---|
69 | if (tm->tm_mon > 11U) goto string;
|
---|
70 | item = ABMON_1 + tm->tm_mon;
|
---|
71 | goto nl_strcat;
|
---|
72 | case 'B':
|
---|
73 | if (tm->tm_mon > 11U) goto string;
|
---|
74 | item = MON_1 + tm->tm_mon;
|
---|
75 | goto nl_strcat;
|
---|
76 | case 'c':
|
---|
77 | item = D_T_FMT;
|
---|
78 | goto nl_strftime;
|
---|
79 | case 'C':
|
---|
80 | val = (1900LL+tm->tm_year) / 100;
|
---|
81 | goto number;
|
---|
82 | case 'd':
|
---|
83 | val = tm->tm_mday;
|
---|
84 | goto number;
|
---|
85 | case 'D':
|
---|
86 | fmt = "%m/%d/%y";
|
---|
87 | goto recu_strftime;
|
---|
88 | case 'e':
|
---|
89 | *l = snprintf(*s, sizeof *s, "%2d", tm->tm_mday);
|
---|
90 | return *s;
|
---|
91 | case 'F':
|
---|
92 | fmt = "%Y-%m-%d";
|
---|
93 | goto recu_strftime;
|
---|
94 | case 'g':
|
---|
95 | case 'G':
|
---|
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;
|
---|
100 | else width = 4;
|
---|
101 | goto number;
|
---|
102 | case 'H':
|
---|
103 | val = tm->tm_hour;
|
---|
104 | goto number;
|
---|
105 | case 'I':
|
---|
106 | val = tm->tm_hour;
|
---|
107 | if (!val) val = 12;
|
---|
108 | else if (val > 12) val -= 12;
|
---|
109 | goto number;
|
---|
110 | case 'j':
|
---|
111 | val = tm->tm_yday+1;
|
---|
112 | width = 3;
|
---|
113 | goto number;
|
---|
114 | case 'm':
|
---|
115 | val = tm->tm_mon+1;
|
---|
116 | goto number;
|
---|
117 | case 'M':
|
---|
118 | val = tm->tm_min;
|
---|
119 | goto number;
|
---|
120 | case 'n':
|
---|
121 | *l = 1;
|
---|
122 | return "\n";
|
---|
123 | case 'p':
|
---|
124 | item = tm->tm_hour >= 12 ? PM_STR : AM_STR;
|
---|
125 | goto nl_strcat;
|
---|
126 | case 'r':
|
---|
127 | item = T_FMT_AMPM;
|
---|
128 | goto nl_strftime;
|
---|
129 | case 'R':
|
---|
130 | fmt = "%H:%M";
|
---|
131 | goto recu_strftime;
|
---|
132 | case 's':
|
---|
133 | val = __tm_to_secs(tm) - tm->__tm_gmtoff;
|
---|
134 | width = 1;
|
---|
135 | goto number;
|
---|
136 | case 'S':
|
---|
137 | val = tm->tm_sec;
|
---|
138 | goto number;
|
---|
139 | case 't':
|
---|
140 | *l = 1;
|
---|
141 | return "\t";
|
---|
142 | case 'T':
|
---|
143 | fmt = "%H:%M:%S";
|
---|
144 | goto recu_strftime;
|
---|
145 | case 'u':
|
---|
146 | val = tm->tm_wday ? tm->tm_wday : 7;
|
---|
147 | width = 1;
|
---|
148 | goto number;
|
---|
149 | case 'U':
|
---|
150 | val = (tm->tm_yday + 7U - tm->tm_wday) / 7;
|
---|
151 | goto number;
|
---|
152 | case 'W':
|
---|
153 | val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
|
---|
154 | goto number;
|
---|
155 | case 'V':
|
---|
156 | val = week_num(tm);
|
---|
157 | goto number;
|
---|
158 | case 'w':
|
---|
159 | val = tm->tm_wday;
|
---|
160 | width = 1;
|
---|
161 | goto number;
|
---|
162 | case 'x':
|
---|
163 | item = D_FMT;
|
---|
164 | goto nl_strftime;
|
---|
165 | case 'X':
|
---|
166 | item = T_FMT;
|
---|
167 | goto nl_strftime;
|
---|
168 | case 'y':
|
---|
169 | val = (tm->tm_year + 1900LL) % 100;
|
---|
170 | if (val < 0) val = -val;
|
---|
171 | goto number;
|
---|
172 | case 'Y':
|
---|
173 | val = tm->tm_year + 1900LL;
|
---|
174 | if (val >= 10000) {
|
---|
175 | *l = snprintf(*s, sizeof *s, "+%lld", val);
|
---|
176 | return *s;
|
---|
177 | }
|
---|
178 | width = 4;
|
---|
179 | goto number;
|
---|
180 | case 'z':
|
---|
181 | if (tm->tm_isdst < 0) {
|
---|
182 | *l = 0;
|
---|
183 | return "";
|
---|
184 | }
|
---|
185 | *l = snprintf(*s, sizeof *s, "%+.2d%.2d",
|
---|
186 | (tm->__tm_gmtoff)/3600,
|
---|
187 | abs(tm->__tm_gmtoff%3600)/60);
|
---|
188 | return *s;
|
---|
189 | case 'Z':
|
---|
190 | if (tm->tm_isdst < 0) {
|
---|
191 | *l = 0;
|
---|
192 | return "";
|
---|
193 | }
|
---|
194 | fmt = __tm_to_tzname(tm);
|
---|
195 | goto string;
|
---|
196 | case '%':
|
---|
197 | *l = 1;
|
---|
198 | return "%";
|
---|
199 | default:
|
---|
200 | return 0;
|
---|
201 | }
|
---|
202 | number:
|
---|
203 | *l = snprintf(*s, sizeof *s, "%0*lld", width, val);
|
---|
204 | return *s;
|
---|
205 | nl_strcat:
|
---|
206 | fmt = __nl_langinfo_l(item, loc);
|
---|
207 | string:
|
---|
208 | *l = strlen(fmt);
|
---|
209 | return fmt;
|
---|
210 | nl_strftime:
|
---|
211 | fmt = __nl_langinfo_l(item, loc);
|
---|
212 | recu_strftime:
|
---|
213 | *l = __strftime_l(*s, sizeof *s, fmt, tm, loc);
|
---|
214 | if (!*l) return 0;
|
---|
215 | return *s;
|
---|
216 | }
|
---|
217 |
|
---|
218 | size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm, locale_t loc)
|
---|
219 | {
|
---|
220 | size_t l, k;
|
---|
221 | char buf[100];
|
---|
222 | char *p;
|
---|
223 | const char *t;
|
---|
224 | int plus;
|
---|
225 | unsigned long width;
|
---|
226 | for (l=0; l<n; f++) {
|
---|
227 | if (!*f) {
|
---|
228 | s[l] = 0;
|
---|
229 | return l;
|
---|
230 | }
|
---|
231 | if (*f != '%') {
|
---|
232 | s[l++] = *f;
|
---|
233 | continue;
|
---|
234 | }
|
---|
235 | f++;
|
---|
236 | if ((plus = (*f == '+'))) f++;
|
---|
237 | width = strtoul(f, &p, 10);
|
---|
238 | if (*p == 'C' || *p == 'F' || *p == 'G' || *p == 'Y') {
|
---|
239 | if (!width && p!=f) width = 1;
|
---|
240 | } else {
|
---|
241 | width = 0;
|
---|
242 | }
|
---|
243 | f = p;
|
---|
244 | if (*f == 'E' || *f == 'O') f++;
|
---|
245 | t = __strftime_fmt_1(&buf, &k, *f, tm, loc);
|
---|
246 | if (!t) break;
|
---|
247 | if (width) {
|
---|
248 | for (; *t=='+' || *t=='-' || (*t=='0'&&t[1]); t++, k--);
|
---|
249 | width--;
|
---|
250 | if (plus && tm->tm_year >= 10000-1900)
|
---|
251 | s[l++] = '+';
|
---|
252 | else if (tm->tm_year < -1900)
|
---|
253 | s[l++] = '-';
|
---|
254 | else
|
---|
255 | width++;
|
---|
256 | for (; width > k && l < n; width--)
|
---|
257 | s[l++] = '0';
|
---|
258 | }
|
---|
259 | if (k > n-l) k = n-l;
|
---|
260 | memcpy(s+l, t, k);
|
---|
261 | l += k;
|
---|
262 | }
|
---|
263 | if (n) {
|
---|
264 | if (l==n) l=n-1;
|
---|
265 | s[l] = 0;
|
---|
266 | }
|
---|
267 | return 0;
|
---|
268 | }
|
---|
269 |
|
---|
270 | size_t strftime(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm)
|
---|
271 | {
|
---|
272 | return __strftime_l(s, n, f, tm, CURRENT_LOCALE);
|
---|
273 | }
|
---|
274 |
|
---|
275 | weak_alias(__strftime_l, strftime_l);
|
---|