1 files changed, 172 insertions, 0 deletions
diff --git a/src/time/strftime.c b/src/time/strftime.c
new file mode 100644
index 00000000..f1b94631
--- /dev/null
+++ b/src/time/strftime.c
@@ -0,0 +1,172 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <langinfo.h>
+#include <time.h>
+#include "__time.h"
+
+// FIXME: integer overflows
+
+const char *__langinfo(nl_item);
+
+size_t strftime(char *s, size_t n, const char *f, const struct tm *tm)
+{
+	nl_item item;
+	int val;
+	const char *fmt;
+	size_t l;
+	for (l=0; *f && l<n; f++) {
+		if (*f == '%') {
+do_fmt:
+		switch (*++f) {
+		case '%':
+			goto literal;
+		case 'E':
+		case 'O':
+			goto do_fmt;
+		case 'a':
+			item = ABDAY_1 + tm->tm_wday;
+			goto nl_strcat;
+		case 'A':
+			item = DAY_1 + tm->tm_wday;
+			goto nl_strcat;
+		case 'h':
+		case 'b':
+			item = ABMON_1 + tm->tm_mon;
+			goto nl_strcat;
+		case 'B':
+			item = MON_1 + tm->tm_mon;
+			goto nl_strcat;
+		case 'c':
+			item = D_T_FMT;
+			goto nl_strftime;
+		case 'C':
+			val = (1900+tm->tm_year) / 100;
+			fmt = "%02d";
+			goto number;
+		case 'd':
+			val = tm->tm_mday;
+			fmt = "%02d";
+			goto number;
+		case 'D':
+			fmt = "%m/%d/%y";
+			goto recu_strftime;
+		case 'e':
+			val = tm->tm_mday;
+			fmt = "%2d";
+			goto number;
+		case 'F':
+			fmt = "%Y-%m-%d";
+			goto recu_strftime;
+		case 'g':
+			// FIXME
+			val = 0; //week_based_year(tm)%100;
+			fmt = "%02d";
+			goto number;
+		case 'G':
+			// FIXME
+			val = 0; //week_based_year(tm);
+			fmt = "%04d";
+			goto number;
+		case 'H':
+			val = tm->tm_hour;
+			fmt = "%02d";
+			goto number;
+		case 'I':
+			val = tm->tm_hour;
+			if (!val) val = 12;
+			else if (val > 12) val -= 12;
+			fmt = "%02d";
+			goto number;
+		case 'j':
+			val = tm->tm_yday+1;
+			fmt = "%03d";
+			goto number;
+		case 'm':
+			val = tm->tm_mon+1;
+			fmt = "%02d";
+			goto number;
+		case 'M':
+			val = tm->tm_min;
+			fmt = "%02d";
+			goto number;
+		case 'n':
+			s[l++] = '\n';
+			continue;
+		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->tm_sec;
+			fmt = "%02d";
+			goto number;
+		case 't':
+			s[l++] = '\t';
+			continue;
+		case 'T':
+			fmt = "%H:%M:%S";
+			goto recu_strftime;
+		case 'u':
+			val = tm->tm_wday ? tm->tm_wday : 7;
+			fmt = "%d";
+			goto number;
+		case 'U':
+		case 'V':
+		case 'W':
+			// FIXME: week number mess..
+			continue;
+		case 'w':
+			val = tm->tm_wday;
+			fmt = "%d";
+			goto number;
+		case 'x':
+			item = D_FMT;
+			goto nl_strftime;
+		case 'X':
+			item = T_FMT;
+			goto nl_strftime;
+		case 'y':
+			val = tm->tm_year % 100;
+			fmt = "%02d";
+			goto number;
+		case 'Y':
+			val = tm->tm_year + 1900;
+			fmt = "%04d";
+			goto number;
+		case 'z':
+			if (tm->tm_isdst < 0) continue;
+			val = -__timezone - (tm->tm_isdst ? __dst_offset : 0);
+			l += snprintf(s+l, n-l, "%+.2d%.2d", val/3600, abs(val%3600)/60);
+			continue;
+		case 'Z':
+			if (tm->tm_isdst < 0 || !__tzname[0] || !__tzname[0][0])
+				continue;
+			l += snprintf(s+l, n-l, "%s", __tzname[!!tm->tm_isdst]);
+			continue;
+		default:
+			return 0;
+		}
+		}
+literal:
+		s[l++] = *f;
+		continue;
+number:
+		l += snprintf(s+l, n-l, fmt, val);
+		continue;
+nl_strcat:
+		l += snprintf(s+l, n-l, "%s", __langinfo(item));
+		continue;
+nl_strftime:
+		fmt = __langinfo(item);
+recu_strftime:
+		l += strftime(s+l, n-l, fmt, tm);
+	}
+	if (l >= n) return 0;
+	s[l] = 0;
+	return l;
+}