source: asp3_tinet_ecnl_arm/trunk/musl-1.1.18/src/time/strftime.c@ 352

Last change on this file since 352 was 352, checked in by coas-nagasima, 6 years ago

arm向けASP3版ECNLを追加
  • Property svn:eol-style set to native
  • Property svn:mime-type set to text/x-csrc;charset=UTF-8
File size: 5.6 KB
Line 
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
12const char *__nl_langinfo_l(nl_item, locale_t);
13
14static 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
22static 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
48const char *__tm_to_tzname(const struct tm *);
49size_t __strftime_l(char *restrict, size_t, const char *restrict, const struct tm *restrict, locale_t);
50
51const 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 }
202number:
203 *l = snprintf(*s, sizeof *s, "%0*lld", width, val);
204 return *s;
205nl_strcat:
206 fmt = __nl_langinfo_l(item, loc);
207string:
208 *l = strlen(fmt);
209 return fmt;
210nl_strftime:
211 fmt = __nl_langinfo_l(item, loc);
212recu_strftime:
213 *l = __strftime_l(*s, sizeof *s, fmt, tm, loc);
214 if (!*l) return 0;
215 return *s;
216}
217
218size_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
270size_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
275weak_alias(__strftime_l, strftime_l);
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