[352] | 1 | #include <stdio.h>
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| 2 | #include <stdlib.h>
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| 3 | #include <string.h>
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| 4 | #include <langinfo.h>
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| 5 | #include <locale.h>
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| 6 | #include <time.h>
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| 7 | #include <limits.h>
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| 8 | #include "locale_impl.h"
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| 9 | #include "libc.h"
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| 10 | #include "time_impl.h"
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| 11 |
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| 12 | const char *__nl_langinfo_l(nl_item, locale_t);
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| 13 |
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| 14 | static int is_leap(int y)
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| 15 | {
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| 16 | /* Avoid overflow */
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| 17 | if (y>INT_MAX-1900) y -= 2000;
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| 18 | y += 1900;
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| 19 | return !(y%4) && ((y%100) || !(y%400));
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| 20 | }
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| 21 |
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| 22 | static int week_num(const struct tm *tm)
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| 23 | {
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| 24 | int val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
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| 25 | /* If 1 Jan is just 1-3 days past Monday,
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| 26 | * the previous week is also in this year. */
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| 27 | if ((tm->tm_wday + 371U - tm->tm_yday - 2) % 7 <= 2)
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| 28 | val++;
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| 29 | if (!val) {
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| 30 | val = 52;
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| 31 | /* If 31 December of prev year a Thursday,
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| 32 | * or Friday of a leap year, then the
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| 33 | * prev year has 53 weeks. */
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| 34 | int dec31 = (tm->tm_wday + 7U - tm->tm_yday - 1) % 7;
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| 35 | if (dec31 == 4 || (dec31 == 5 && is_leap(tm->tm_year%400-1)))
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| 36 | val++;
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| 37 | } else if (val == 53) {
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| 38 | /* If 1 January is not a Thursday, and not
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| 39 | * a Wednesday of a leap year, then this
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| 40 | * year has only 52 weeks. */
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| 41 | int jan1 = (tm->tm_wday + 371U - tm->tm_yday) % 7;
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| 42 | if (jan1 != 4 && (jan1 != 3 || !is_leap(tm->tm_year)))
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| 43 | val = 1;
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| 44 | }
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| 45 | return val;
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| 46 | }
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| 47 |
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| 48 | const char *__tm_to_tzname(const struct tm *);
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| 49 | size_t __strftime_l(char *restrict, size_t, const char *restrict, const struct tm *restrict, locale_t);
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| 50 |
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| 51 | const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc)
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| 52 | {
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| 53 | nl_item item;
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| 54 | long long val;
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| 55 | const char *fmt = "-";
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| 56 | int width = 2;
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| 57 |
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| 58 | switch (f) {
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| 59 | case 'a':
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| 60 | if (tm->tm_wday > 6U) goto string;
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| 61 | item = ABDAY_1 + tm->tm_wday;
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| 62 | goto nl_strcat;
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| 63 | case 'A':
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| 64 | if (tm->tm_wday > 6U) goto string;
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| 65 | item = DAY_1 + tm->tm_wday;
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| 66 | goto nl_strcat;
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| 67 | case 'h':
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| 68 | case 'b':
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| 69 | if (tm->tm_mon > 11U) goto string;
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| 70 | item = ABMON_1 + tm->tm_mon;
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| 71 | goto nl_strcat;
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| 72 | case 'B':
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| 73 | if (tm->tm_mon > 11U) goto string;
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| 74 | item = MON_1 + tm->tm_mon;
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| 75 | goto nl_strcat;
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| 76 | case 'c':
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| 77 | item = D_T_FMT;
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| 78 | goto nl_strftime;
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| 79 | case 'C':
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| 80 | val = (1900LL+tm->tm_year) / 100;
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| 81 | goto number;
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| 82 | case 'd':
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| 83 | val = tm->tm_mday;
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| 84 | goto number;
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| 85 | case 'D':
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| 86 | fmt = "%m/%d/%y";
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| 87 | goto recu_strftime;
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| 88 | case 'e':
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| 89 | *l = snprintf(*s, sizeof *s, "%2d", tm->tm_mday);
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| 90 | return *s;
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| 91 | case 'F':
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| 92 | fmt = "%Y-%m-%d";
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| 93 | goto recu_strftime;
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| 94 | case 'g':
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| 95 | case 'G':
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| 96 | val = tm->tm_year + 1900LL;
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| 97 | if (tm->tm_yday < 3 && week_num(tm) != 1) val--;
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| 98 | else if (tm->tm_yday > 360 && week_num(tm) == 1) val++;
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| 99 | if (f=='g') val %= 100;
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| 100 | else width = 4;
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| 101 | goto number;
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| 102 | case 'H':
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| 103 | val = tm->tm_hour;
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| 104 | goto number;
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| 105 | case 'I':
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| 106 | val = tm->tm_hour;
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| 107 | if (!val) val = 12;
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| 108 | else if (val > 12) val -= 12;
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| 109 | goto number;
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| 110 | case 'j':
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| 111 | val = tm->tm_yday+1;
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| 112 | width = 3;
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| 113 | goto number;
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| 114 | case 'm':
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| 115 | val = tm->tm_mon+1;
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| 116 | goto number;
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| 117 | case 'M':
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| 118 | val = tm->tm_min;
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| 119 | goto number;
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| 120 | case 'n':
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| 121 | *l = 1;
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| 122 | return "\n";
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| 123 | case 'p':
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| 124 | item = tm->tm_hour >= 12 ? PM_STR : AM_STR;
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| 125 | goto nl_strcat;
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| 126 | case 'r':
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| 127 | item = T_FMT_AMPM;
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| 128 | goto nl_strftime;
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| 129 | case 'R':
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| 130 | fmt = "%H:%M";
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| 131 | goto recu_strftime;
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| 132 | case 's':
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| 133 | val = __tm_to_secs(tm) - tm->__tm_gmtoff;
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| 134 | width = 1;
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| 135 | goto number;
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| 136 | case 'S':
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| 137 | val = tm->tm_sec;
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| 138 | goto number;
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| 139 | case 't':
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| 140 | *l = 1;
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| 141 | return "\t";
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| 142 | case 'T':
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| 143 | fmt = "%H:%M:%S";
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| 144 | goto recu_strftime;
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| 145 | case 'u':
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| 146 | val = tm->tm_wday ? tm->tm_wday : 7;
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| 147 | width = 1;
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| 148 | goto number;
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| 149 | case 'U':
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| 150 | val = (tm->tm_yday + 7U - tm->tm_wday) / 7;
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| 151 | goto number;
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| 152 | case 'W':
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| 153 | val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
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| 154 | goto number;
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| 155 | case 'V':
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| 156 | val = week_num(tm);
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| 157 | goto number;
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| 158 | case 'w':
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| 159 | val = tm->tm_wday;
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| 160 | width = 1;
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| 161 | goto number;
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| 162 | case 'x':
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| 163 | item = D_FMT;
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| 164 | goto nl_strftime;
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| 165 | case 'X':
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| 166 | item = T_FMT;
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| 167 | goto nl_strftime;
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| 168 | case 'y':
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| 169 | val = (tm->tm_year + 1900LL) % 100;
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| 170 | if (val < 0) val = -val;
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| 171 | goto number;
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| 172 | case 'Y':
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| 173 | val = tm->tm_year + 1900LL;
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| 174 | if (val >= 10000) {
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| 175 | *l = snprintf(*s, sizeof *s, "+%lld", val);
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| 176 | return *s;
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| 177 | }
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| 178 | width = 4;
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| 179 | goto number;
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| 180 | case 'z':
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| 181 | if (tm->tm_isdst < 0) {
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| 182 | *l = 0;
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| 183 | return "";
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| 184 | }
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| 185 | *l = snprintf(*s, sizeof *s, "%+.2d%.2d",
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| 186 | (tm->__tm_gmtoff)/3600,
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| 187 | abs(tm->__tm_gmtoff%3600)/60);
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| 188 | return *s;
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| 189 | case 'Z':
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| 190 | if (tm->tm_isdst < 0) {
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| 191 | *l = 0;
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| 192 | return "";
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| 193 | }
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| 194 | fmt = __tm_to_tzname(tm);
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| 195 | goto string;
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| 196 | case '%':
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| 197 | *l = 1;
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| 198 | return "%";
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| 199 | default:
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| 200 | return 0;
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| 201 | }
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| 202 | number:
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| 203 | *l = snprintf(*s, sizeof *s, "%0*lld", width, val);
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| 204 | return *s;
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| 205 | nl_strcat:
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| 206 | fmt = __nl_langinfo_l(item, loc);
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| 207 | string:
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| 208 | *l = strlen(fmt);
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| 209 | return fmt;
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| 210 | nl_strftime:
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| 211 | fmt = __nl_langinfo_l(item, loc);
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| 212 | recu_strftime:
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| 213 | *l = __strftime_l(*s, sizeof *s, fmt, tm, loc);
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| 214 | if (!*l) return 0;
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| 215 | return *s;
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| 216 | }
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| 217 |
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| 218 | 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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| 219 | {
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| 220 | size_t l, k;
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| 221 | char buf[100];
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| 222 | char *p;
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| 223 | const char *t;
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| 224 | int plus;
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| 225 | unsigned long width;
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| 226 | for (l=0; l<n; f++) {
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| 227 | if (!*f) {
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| 228 | s[l] = 0;
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| 229 | return l;
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| 230 | }
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| 231 | if (*f != '%') {
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| 232 | s[l++] = *f;
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| 233 | continue;
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| 234 | }
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| 235 | f++;
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| 236 | if ((plus = (*f == '+'))) f++;
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| 237 | width = strtoul(f, &p, 10);
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| 238 | if (*p == 'C' || *p == 'F' || *p == 'G' || *p == 'Y') {
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| 239 | if (!width && p!=f) width = 1;
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| 240 | } else {
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| 241 | width = 0;
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| 242 | }
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| 243 | f = p;
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| 244 | if (*f == 'E' || *f == 'O') f++;
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| 245 | t = __strftime_fmt_1(&buf, &k, *f, tm, loc);
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| 246 | if (!t) break;
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| 247 | if (width) {
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| 248 | for (; *t=='+' || *t=='-' || (*t=='0'&&t[1]); t++, k--);
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| 249 | width--;
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| 250 | if (plus && tm->tm_year >= 10000-1900)
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| 251 | s[l++] = '+';
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| 252 | else if (tm->tm_year < -1900)
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| 253 | s[l++] = '-';
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| 254 | else
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| 255 | width++;
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| 256 | for (; width > k && l < n; width--)
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| 257 | s[l++] = '0';
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| 258 | }
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| 259 | if (k > n-l) k = n-l;
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| 260 | memcpy(s+l, t, k);
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| 261 | l += k;
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| 262 | }
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| 263 | if (n) {
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| 264 | if (l==n) l=n-1;
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| 265 | s[l] = 0;
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| 266 | }
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| 267 | return 0;
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| 268 | }
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| 269 |
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| 270 | size_t strftime(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm)
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| 271 | {
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| 272 | return __strftime_l(s, n, f, tm, CURRENT_LOCALE);
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| 273 | }
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| 274 |
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| 275 | weak_alias(__strftime_l, strftime_l);
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