X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Ftime%2Fstrftime.c;h=592b214d0ff6ac90c2a9b761303a944837b5b01f;hp=f1b9463114281a6a792f2247cd351fa647a7ad94;hb=87be54a135db6d9ad16fcffe72b05c8d23b0f089;hpb=0b44a0315b47dd8eced9f3b7f31580cf14bbfc01

diff --git a/src/time/strftime.c b/src/time/strftime.c
index f1b94631..592b214d 100644
--- a/src/time/strftime.c
+++ b/src/time/strftime.c
@@ -1,14 +1,50 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <langinfo.h>
+#include <locale.h>
 #include <time.h>
-#include "__time.h"
+#include <limits.h>
+#include "libc.h"
 
 // FIXME: integer overflows
 
-const char *__langinfo(nl_item);
+const char *__nl_langinfo_l(nl_item, locale_t);
 
-size_t strftime(char *s, size_t n, const char *f, const struct tm *tm)
+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 + 7 - (tm->tm_wday+6)%7) / 7;
+	/* If 1 Jan is just 1-3 days past Monday,
+	 * the previous week is also in this year. */
+	if ((tm->tm_wday - tm->tm_yday - 2 + 371) % 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 - tm->tm_yday - 1 + 7) % 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 - tm->tm_yday + 371) % 7;
+		if (jan1 != 4 && (jan1 != 3 || !is_leap(tm->tm_year)))
+			val = 1;
+	}
+	return val;
+}
+
+size_t __strftime_l(char *restrict s, size_t n, const char *restrict f, const struct tm *restrict tm, locale_t loc)
 {
 	nl_item item;
 	int val;
@@ -58,14 +94,15 @@ do_fmt:
 			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";
+			val = tm->tm_year + 1900;
+			if (tm->tm_yday < 3 && week_num(tm) != 1) val--;
+			else if (tm->tm_yday > 360 && week_num(tm) == 1) val++;
+			if (*f=='g') {
+				fmt = "%02d";
+				val %= 100;
+			}
 			goto number;
 		case 'H':
 			val = tm->tm_hour;
@@ -116,10 +153,17 @@ do_fmt:
 			fmt = "%d";
 			goto number;
 		case 'U':
-		case 'V':
+			val = (tm->tm_yday + 7 - tm->tm_wday) / 7;
+			fmt = "%02d";
+			goto number;
 		case 'W':
-			// FIXME: week number mess..
-			continue;
+			val = (tm->tm_yday + 7 - (tm->tm_wday+6)%7) / 7;
+			fmt = "%02d";
+			goto number;
+		case 'V':
+			val = week_num(tm);
+			fmt = "%02d";
+			goto number;
 		case 'w':
 			val = tm->tm_wday;
 			fmt = "%d";
@@ -139,14 +183,11 @@ do_fmt:
 			fmt = "%04d";
 			goto number;
 		case 'z':
-			if (tm->tm_isdst < 0) continue;
-			val = -__timezone - (tm->tm_isdst ? __dst_offset : 0);
+			val = -tm->__tm_gmtoff;
 			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]);
+			l += snprintf(s+l, n-l, "%s", tm->__tm_zone);
 			continue;
 		default:
 			return 0;
@@ -159,14 +200,21 @@ number:
 		l += snprintf(s+l, n-l, fmt, val);
 		continue;
 nl_strcat:
-		l += snprintf(s+l, n-l, "%s", __langinfo(item));
+		l += snprintf(s+l, n-l, "%s", __nl_langinfo_l(item, loc));
 		continue;
 nl_strftime:
-		fmt = __langinfo(item);
+		fmt = __nl_langinfo_l(item, loc);
 recu_strftime:
-		l += strftime(s+l, n-l, fmt, tm);
+		l += __strftime_l(s+l, n-l, fmt, tm, loc);
 	}
 	if (l >= n) return 0;
 	s[l] = 0;
 	return l;
 }
+
+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, LC_GLOBAL_LOCALE);
+}
+
+weak_alias(__strftime_l, strftime_l);