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-rw-r--r--libc-top-half/musl/src/time/strftime.c285
1 files changed, 285 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/time/strftime.c b/libc-top-half/musl/src/time/strftime.c
new file mode 100644
index 0000000..a1db9cb
--- /dev/null
+++ b/libc-top-half/musl/src/time/strftime.c
@@ -0,0 +1,285 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <langinfo.h>
+#include <locale.h>
+#include <time.h>
+#include <limits.h>
+#include "locale_impl.h"
+#include "time_impl.h"
+
+static int is_leap(int y)
+{
+ /* Avoid overflow */
+ if (y>INT_MAX-1900) y -= 2000;
+ y += 1900;
+ return !(y%4) && ((y%100) || !(y%400));
+}
+
+static int week_num(const struct tm *tm)
+{
+ int val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
+ /* If 1 Jan is just 1-3 days past Monday,
+ * the previous week is also in this year. */
+ if ((tm->tm_wday + 371U - tm->tm_yday - 2) % 7 <= 2)
+ val++;
+ if (!val) {
+ val = 52;
+ /* If 31 December of prev year a Thursday,
+ * or Friday of a leap year, then the
+ * prev year has 53 weeks. */
+ int dec31 = (tm->tm_wday + 7U - tm->tm_yday - 1) % 7;
+ if (dec31 == 4 || (dec31 == 5 && is_leap(tm->tm_year%400-1)))
+ val++;
+ } else if (val == 53) {
+ /* If 1 January is not a Thursday, and not
+ * a Wednesday of a leap year, then this
+ * year has only 52 weeks. */
+ int jan1 = (tm->tm_wday + 371U - tm->tm_yday) % 7;
+ if (jan1 != 4 && (jan1 != 3 || !is_leap(tm->tm_year)))
+ val = 1;
+ }
+ return val;
+}
+
+const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc, int pad)
+{
+ nl_item item;
+ long long val;
+ const char *fmt = "-";
+ int width = 2, def_pad = '0';
+
+ switch (f) {
+ case 'a':
+ if (tm->tm_wday > 6U) goto string;
+ item = ABDAY_1 + tm->tm_wday;
+ goto nl_strcat;
+ case 'A':
+ if (tm->tm_wday > 6U) goto string;
+ item = DAY_1 + tm->tm_wday;
+ goto nl_strcat;
+ case 'h':
+ case 'b':
+ if (tm->tm_mon > 11U) goto string;
+ item = ABMON_1 + tm->tm_mon;
+ goto nl_strcat;
+ case 'B':
+ if (tm->tm_mon > 11U) goto string;
+ item = MON_1 + tm->tm_mon;
+ goto nl_strcat;
+ case 'c':
+ item = D_T_FMT;
+ goto nl_strftime;
+ case 'C':
+ val = (1900LL+tm->tm_year) / 100;
+ goto number;
+ case 'e':
+ def_pad = '_';
+ case 'd':
+ val = tm->tm_mday;
+ goto number;
+ case 'D':
+ fmt = "%m/%d/%y";
+ goto recu_strftime;
+ case 'F':
+ fmt = "%Y-%m-%d";
+ goto recu_strftime;
+ case 'g':
+ case 'G':
+ val = tm->tm_year + 1900LL;
+ if (tm->tm_yday < 3 && week_num(tm) != 1) val--;
+ else if (tm->tm_yday > 360 && week_num(tm) == 1) val++;
+ if (f=='g') val %= 100;
+ else width = 4;
+ goto number;
+ case 'H':
+ val = tm->tm_hour;
+ goto number;
+ case 'I':
+ val = tm->tm_hour;
+ if (!val) val = 12;
+ else if (val > 12) val -= 12;
+ goto number;
+ case 'j':
+ val = tm->tm_yday+1;
+ width = 3;
+ goto number;
+ case 'm':
+ val = tm->tm_mon+1;
+ goto number;
+ case 'M':
+ val = tm->tm_min;
+ goto number;
+ case 'n':
+ *l = 1;
+ return "\n";
+ case 'p':
+ item = tm->tm_hour >= 12 ? PM_STR : AM_STR;
+ goto nl_strcat;
+ case 'r':
+ item = T_FMT_AMPM;
+ goto nl_strftime;
+ case 'R':
+ fmt = "%H:%M";
+ goto recu_strftime;
+ case 's':
+ val = __tm_to_secs(tm) - tm->__tm_gmtoff;
+ width = 1;
+ goto number;
+ case 'S':
+ val = tm->tm_sec;
+ goto number;
+ case 't':
+ *l = 1;
+ return "\t";
+ case 'T':
+ fmt = "%H:%M:%S";
+ goto recu_strftime;
+ case 'u':
+ val = tm->tm_wday ? tm->tm_wday : 7;
+ width = 1;
+ goto number;
+ case 'U':
+ val = (tm->tm_yday + 7U - tm->tm_wday) / 7;
+ goto number;
+ case 'W':
+ val = (tm->tm_yday + 7U - (tm->tm_wday+6U)%7) / 7;
+ goto number;
+ case 'V':
+ val = week_num(tm);
+ goto number;
+ case 'w':
+ val = tm->tm_wday;
+ width = 1;
+ goto number;
+ case 'x':
+ item = D_FMT;
+ goto nl_strftime;
+ case 'X':
+ item = T_FMT;
+ goto nl_strftime;
+ case 'y':
+ val = (tm->tm_year + 1900LL) % 100;
+ if (val < 0) val = -val;
+ goto number;
+ case 'Y':
+ val = tm->tm_year + 1900LL;
+ if (val >= 10000) {
+ *l = snprintf(*s, sizeof *s, "+%lld", val);
+ return *s;
+ }
+ width = 4;
+ goto number;
+ case 'z':
+ if (tm->tm_isdst < 0) {
+ *l = 0;
+ return "";
+ }
+#ifdef __wasilibc_unmodified_upstream // wasi-libc's __tm_gmtoff is an int
+ *l = snprintf(*s, sizeof *s, "%+.4ld",
+#else
+ *l = snprintf(*s, sizeof *s, "%+.4d",
+#endif
+ tm->__tm_gmtoff/3600*100 + tm->__tm_gmtoff%3600/60);
+ return *s;
+ case 'Z':
+ if (tm->tm_isdst < 0) {
+ *l = 0;
+ return "";
+ }
+ fmt = __tm_to_tzname(tm);
+ goto string;
+ case '%':
+ *l = 1;
+ return "%";
+ default:
+ return 0;
+ }
+number:
+ switch (pad ? pad : def_pad) {
+ case '-': *l = snprintf(*s, sizeof *s, "%lld", val); break;
+ case '_': *l = snprintf(*s, sizeof *s, "%*lld", width, val); break;
+ case '0':
+ default: *l = snprintf(*s, sizeof *s, "%0*lld", width, val); break;
+ }
+ return *s;
+nl_strcat:
+ fmt = __nl_langinfo_l(item, loc);
+string:
+ *l = strlen(fmt);
+ return fmt;
+nl_strftime:
+ fmt = __nl_langinfo_l(item, loc);
+recu_strftime:
+ *l = __strftime_l(*s, sizeof *s, fmt, tm, loc);
+ if (!*l) return 0;
+ return *s;
+}
+
+size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm, locale_t loc)
+{
+ size_t l, k;
+ char buf[100];
+ char *p;
+ const char *t;
+ int pad, plus;
+ unsigned long width;
+ for (l=0; l<n; f++) {
+ if (!*f) {
+ s[l] = 0;
+ return l;
+ }
+ if (*f != '%') {
+ s[l++] = *f;
+ continue;
+ }
+ f++;
+ pad = 0;
+ if (*f == '-' || *f == '_' || *f == '0') pad = *f++;
+ if ((plus = (*f == '+'))) f++;
+ width = strtoul(f, &p, 10);
+ if (*p == 'C' || *p == 'F' || *p == 'G' || *p == 'Y') {
+ if (!width && p!=f) width = 1;
+ } else {
+ width = 0;
+ }
+ f = p;
+ if (*f == 'E' || *f == 'O') f++;
+ t = __strftime_fmt_1(&buf, &k, *f, tm, loc, pad);
+ if (!t) break;
+ if (width) {
+ /* Trim off any sign and leading zeros, then
+ * count remaining digits to determine behavior
+ * for the + flag. */
+ if (*t=='+' || *t=='-') t++, k--;
+ for (; *t=='0' && t[1]-'0'<10U; t++, k--);
+ if (width < k) width = k;
+ size_t d;
+ for (d=0; t[d]-'0'<10U; d++);
+ if (tm->tm_year < -1900) {
+ s[l++] = '-';
+ width--;
+ } else if (plus && d+(width-k) >= (*p=='C'?3:5)) {
+ s[l++] = '+';
+ width--;
+ }
+ for (; width > k && l < n; width--)
+ s[l++] = '0';
+ }
+ if (k > n-l) k = n-l;
+ memcpy(s+l, t, k);
+ l += k;
+ }
+ if (n) {
+ if (l==n) l=n-1;
+ s[l] = 0;
+ }
+ return 0;
+}
+
+size_t strftime(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm)
+{
+ return __strftime_l(s, n, f, tm, CURRENT_LOCALE);
+}
+
+weak_alias(__strftime_l, strftime_l);
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-08 01:03:23 +0000