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| (Empty) | |
| 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 t
m *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 % 100; |
| 170 goto number; |
| 171 case 'Y': |
| 172 val = tm->tm_year + 1900LL; |
| 173 if (val >= 10000) { |
| 174 *l = snprintf(*s, sizeof *s, "+%lld", val); |
| 175 return *s; |
| 176 } |
| 177 width = 4; |
| 178 goto number; |
| 179 case 'z': |
| 180 if (tm->tm_isdst < 0) { |
| 181 *l = 0; |
| 182 return ""; |
| 183 } |
| 184 *l = snprintf(*s, sizeof *s, "%+.2d%.2d", |
| 185 (tm->__tm_gmtoff)/3600, |
| 186 abs(tm->__tm_gmtoff%3600)/60); |
| 187 return *s; |
| 188 case 'Z': |
| 189 if (tm->tm_isdst < 0) { |
| 190 *l = 0; |
| 191 return ""; |
| 192 } |
| 193 fmt = __tm_to_tzname(tm); |
| 194 goto string; |
| 195 case '%': |
| 196 *l = 1; |
| 197 return "%"; |
| 198 default: |
| 199 return 0; |
| 200 } |
| 201 number: |
| 202 *l = snprintf(*s, sizeof *s, "%0*lld", width, val); |
| 203 return *s; |
| 204 nl_strcat: |
| 205 fmt = __nl_langinfo_l(item, loc); |
| 206 string: |
| 207 *l = strlen(fmt); |
| 208 return fmt; |
| 209 nl_strftime: |
| 210 fmt = __nl_langinfo_l(item, loc); |
| 211 recu_strftime: |
| 212 *l = __strftime_l(*s, sizeof *s, fmt, tm, loc); |
| 213 if (!*l) return 0; |
| 214 return *s; |
| 215 } |
| 216 |
| 217 size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const st
ruct tm *restrict tm, locale_t loc) |
| 218 { |
| 219 size_t l, k; |
| 220 char buf[100]; |
| 221 char *p; |
| 222 const char *t; |
| 223 int plus; |
| 224 unsigned long width; |
| 225 for (l=0; l<n; f++) { |
| 226 if (!*f) { |
| 227 s[l] = 0; |
| 228 return l; |
| 229 } |
| 230 if (*f != '%') { |
| 231 s[l++] = *f; |
| 232 continue; |
| 233 } |
| 234 f++; |
| 235 if ((plus = (*f == '+'))) f++; |
| 236 width = strtoul(f, &p, 10); |
| 237 if (*p == 'C' || *p == 'F' || *p == 'G' || *p == 'Y') { |
| 238 if (!width && p!=f) width = 1; |
| 239 } else { |
| 240 width = 0; |
| 241 } |
| 242 f = p; |
| 243 if (*f == 'E' || *f == 'O') f++; |
| 244 t = __strftime_fmt_1(&buf, &k, *f, tm, loc); |
| 245 if (!t) break; |
| 246 if (width) { |
| 247 for (; *t=='+' || *t=='-' || (*t=='0'&&t[1]); t++, k--); |
| 248 width--; |
| 249 if (plus && tm->tm_year >= 10000-1900) |
| 250 s[l++] = '+'; |
| 251 else if (tm->tm_year < -1900) |
| 252 s[l++] = '-'; |
| 253 else |
| 254 width++; |
| 255 for (; width > k && l < n; width--) |
| 256 s[l++] = '0'; |
| 257 } |
| 258 if (k > n-l) k = n-l; |
| 259 memcpy(s+l, t, k); |
| 260 l += k; |
| 261 } |
| 262 if (n) { |
| 263 if (l==n) l=n-1; |
| 264 s[l] = 0; |
| 265 } |
| 266 return 0; |
| 267 } |
| 268 |
| 269 size_t strftime(char *restrict s, size_t n, const char *restrict f, const struct
tm *restrict tm) |
| 270 { |
| 271 return __strftime_l(s, n, f, tm, CURRENT_LOCALE); |
| 272 } |
| 273 |
| 274 weak_alias(__strftime_l, strftime_l); |
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Chromium Code Reviews
Issue 1573973002:
Add a "fork" of musl as //fusl. (Closed)
Base URL: https://github.com/domokit/mojo.git@master