mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
bb815eafaf
We now have implement all of Musl's localization code, the same way that Musl implements localization. You may need setlocale(LC_ALL, "C.UTF-8"), just in case anything stops working as expected.
313 lines
8.6 KiB
C
313 lines
8.6 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/ctype.h"
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#include "libc/limits.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/langinfo.h"
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#include "libc/str/locale.h"
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#include "libc/str/locale.internal.h"
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#include "libc/str/nltypes.h"
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#include "libc/str/str.h"
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#include "libc/time.h"
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#include "third_party/musl/time_impl.h"
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__static_yoink("musl_libc_notice");
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static int is_leap(int y)
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{
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/* Avoid overflow */
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if (y>INT_MAX-1900) y -= 2000;
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y += 1900;
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return !(y%4) && ((y%100) || !(y%400));
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}
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static int week_num(const struct tm *tm)
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{
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int val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
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/* If 1 Jan is just 1-3 days past Monday,
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* the previous week is also in this year. */
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if ((tm->tm_wday + 371U - tm->tm_yday - 2) % 7 <= 2)
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val++;
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if (!val) {
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val = 52;
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/* If 31 December of prev year a Thursday,
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* or Friday of a leap year, then the
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* prev year has 53 weeks. */
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int dec31 = (tm->tm_wday + 7U - tm->tm_yday - 1) % 7;
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if (dec31 == 4 || (dec31 == 5 && is_leap(tm->tm_year%400-1)))
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val++;
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} else if (val == 53) {
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/* If 1 January is not a Thursday, and not
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* a Wednesday of a leap year, then this
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* year has only 52 weeks. */
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int jan1 = (tm->tm_wday + 371U - tm->tm_yday) % 7;
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if (jan1 != 4 && (jan1 != 3 || !is_leap(tm->tm_year)))
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val = 1;
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}
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return val;
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}
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const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc, int pad)
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{
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nl_item item;
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long long val;
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const char *fmt = "-";
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int width = 2, def_pad = '0';
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switch (f) {
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case 'a':
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if (tm->tm_wday > 6U) goto string;
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item = ABDAY_1 + tm->tm_wday;
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goto nl_strcat;
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case 'A':
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if (tm->tm_wday > 6U) goto string;
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item = DAY_1 + tm->tm_wday;
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goto nl_strcat;
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case 'h':
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case 'b':
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if (tm->tm_mon > 11U) goto string;
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item = ABMON_1 + tm->tm_mon;
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goto nl_strcat;
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case 'B':
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if (tm->tm_mon > 11U) goto string;
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item = MON_1 + tm->tm_mon;
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goto nl_strcat;
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case 'c':
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item = D_T_FMT;
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goto nl_strftime;
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case 'C':
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val = (1900LL+tm->tm_year) / 100;
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goto number;
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case 'e':
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def_pad = '_';
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case 'd':
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val = tm->tm_mday;
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goto number;
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case 'D':
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fmt = "%m/%d/%y";
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goto recu_strftime;
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case 'F':
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fmt = "%Y-%m-%d";
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goto recu_strftime;
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case 'g':
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case 'G':
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val = tm->tm_year + 1900LL;
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if (tm->tm_yday < 3 && week_num(tm) != 1) val--;
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else if (tm->tm_yday > 360 && week_num(tm) == 1) val++;
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if (f=='g') val %= 100;
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else width = 4;
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goto number;
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case 'H':
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val = tm->tm_hour;
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goto number;
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case 'I':
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val = tm->tm_hour;
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if (!val) val = 12;
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else if (val > 12) val -= 12;
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goto number;
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case 'j':
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val = tm->tm_yday+1;
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width = 3;
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goto number;
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case 'm':
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val = tm->tm_mon+1;
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goto number;
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case 'M':
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val = tm->tm_min;
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goto number;
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case 'n':
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*l = 1;
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return "\n";
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case 'p':
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item = tm->tm_hour >= 12 ? PM_STR : AM_STR;
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goto nl_strcat;
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case 'r':
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item = T_FMT_AMPM;
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goto nl_strftime;
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case 'R':
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fmt = "%H:%M";
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goto recu_strftime;
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case 's':
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val = __tm_to_secs(tm) - tm->tm_gmtoff;
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width = 1;
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goto number;
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case 'S':
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val = tm->tm_sec;
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goto number;
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case 't':
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*l = 1;
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return "\t";
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case 'T':
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fmt = "%H:%M:%S";
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goto recu_strftime;
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case 'u':
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val = tm->tm_wday ? tm->tm_wday : 7;
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width = 1;
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goto number;
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case 'U':
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val = (tm->tm_yday + 7U - tm->tm_wday) / 7;
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goto number;
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case 'W':
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val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
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goto number;
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case 'V':
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val = week_num(tm);
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goto number;
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case 'w':
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val = tm->tm_wday;
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width = 1;
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goto number;
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case 'x':
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item = D_FMT;
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goto nl_strftime;
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case 'X':
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item = T_FMT;
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goto nl_strftime;
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case 'y':
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val = (tm->tm_year + 1900LL) % 100;
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if (val < 0) val = -val;
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goto number;
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case 'Y':
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val = tm->tm_year + 1900LL;
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if (val >= 10000) {
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*l = snprintf(*s, sizeof *s, "%lld", val);
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return *s;
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}
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width = 4;
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goto number;
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case 'z':
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if (tm->tm_isdst < 0) {
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*l = 0;
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return "";
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}
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*l = snprintf(*s, sizeof *s, "%+.4ld",
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tm->tm_gmtoff/3600*100 + tm->tm_gmtoff%3600/60);
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return *s;
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case 'Z':
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if (tm->tm_isdst < 0 || !tm->tm_zone) {
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*l = 0;
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return "";
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}
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fmt = tm->tm_zone;
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goto string;
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case '%':
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*l = 1;
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return "%";
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default:
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return 0;
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}
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number:
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switch (pad ? pad : def_pad) {
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case '-': *l = snprintf(*s, sizeof *s, "%lld", val); break;
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case '_': *l = snprintf(*s, sizeof *s, "%*lld", width, val); break;
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case '0':
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default: *l = snprintf(*s, sizeof *s, "%0*lld", width, val); break;
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}
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return *s;
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nl_strcat:
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fmt = nl_langinfo_l(item, loc);
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string:
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*l = strlen(fmt);
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return fmt;
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nl_strftime:
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fmt = nl_langinfo_l(item, loc);
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recu_strftime:
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*l = strftime_l(*s, sizeof *s, fmt, tm, loc);
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if (!*l) return 0;
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return *s;
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}
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size_t strftime_l(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm, locale_t loc)
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{
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size_t l, k;
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char buf[100];
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char *p;
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const char *t;
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int pad, plus;
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unsigned long width;
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for (l=0; l<n; f++) {
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if (!*f) {
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s[l] = 0;
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return l;
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}
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if (*f != '%') {
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s[l++] = *f;
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continue;
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}
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f++;
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pad = 0;
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if (*f == '-' || *f == '_' || *f == '0') pad = *f++;
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if ((plus = (*f == '+'))) f++;
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if (isdigit(*f)) {
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width = strtoul(f, &p, 10);
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} else {
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width = 0;
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p = (void *)f;
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}
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if (*p == 'C' || *p == 'F' || *p == 'G' || *p == 'Y') {
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if (!width && p!=f) width = 1;
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} else {
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width = 0;
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}
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f = p;
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if (*f == 'E' || *f == 'O') f++;
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t = __strftime_fmt_1(&buf, &k, *f, tm, loc, pad);
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if (!t) break;
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if (width) {
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/* Trim off any sign and leading zeros, then
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* count remaining digits to determine behavior
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* for the + flag. */
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if (*t=='+' || *t=='-') t++, k--;
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for (; *t=='0' && t[1]-'0'<10U; t++, k--);
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if (width < k) width = k;
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size_t d;
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for (d=0; t[d]-'0'<10U; d++);
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if (tm->tm_year < -1900) {
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s[l++] = '-';
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width--;
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} else if (plus && d+(width-k) >= (*p=='C'?3:5)) {
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s[l++] = '+';
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width--;
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}
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for (; width > k && l < n; width--)
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s[l++] = '0';
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}
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if (k > n-l) k = n-l;
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memcpy(s+l, t, k);
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l += k;
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}
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if (n) {
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if (l==n) l=n-1;
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s[l] = 0;
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}
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return 0;
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}
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size_t strftime(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm)
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{
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return strftime_l(s, n, f, tm, CURRENT_LOCALE);
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}
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