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+/* -*- mode: c; c-file-style: "bsd"; indent-tabs-mode: t -*- */
+/* $NetBSD: strftime.c,v 1.8 1999/02/07 17:33:30 augustss Exp $ */
+
+/*
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char *sccsid = "@(#)strftime.c 5.11 (Berkeley) 2/24/91";
+#else
+__RCSID("$NetBSD: strftime.c,v 1.8 1999/02/07 17:33:30 augustss Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <string.h>
+#include <time.h>
+
+/* begin krb5 hack - replace stuff that would come from netbsd libc */
+#undef _CurrentTimeLocale
+#define _CurrentTimeLocale (&dummy_locale_info)
+
+struct dummy_locale_info_t {
+ char d_t_fmt[15];
+ char t_fmt_ampm[12];
+ char t_fmt[9];
+ char d_fmt[9];
+ char day[7][10];
+ char abday[7][4];
+ char mon[12][10];
+ char abmon[12][4];
+ char am_pm[2][3];
+};
+static const struct dummy_locale_info_t dummy_locale_info = {
+ "%a %b %d %X %Y", /* %c */
+ "%I:%M:%S %p", /* %r */
+ "%H:%M:%S", /* %X */
+ "%m/%d/%y", /* %x */
+ { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
+ "Saturday" },
+ { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" },
+ { "January", "February", "March", "April", "May", "June",
+ "July", "August", "September", "October", "November", "December" },
+ { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+ "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" },
+ { "AM", "PM" },
+};
+#undef TM_YEAR_BASE
+#define TM_YEAR_BASE 1900
+
+#undef DAYSPERLYEAR
+#define DAYSPERLYEAR 366
+#undef DAYSPERNYEAR
+#define DAYSPERNYEAR 365
+#undef DAYSPERWEEK
+#define DAYSPERWEEK 7
+#undef isleap
+#define isleap(N) ((N % 4) == 0 && (N % 100 != 0 || N % 400 == 0))
+#undef tzname
+#define tzname my_tzname
+static const char *const tzname[2] = { 0, 0 };
+#undef tzset
+#define tzset()
+#undef __P
+#define __P(X) X /* we already require ansi c in this tree */
+/* end krb5 hack */
+
+static int _add __P((const char *, char **, const char *));
+static int _conv __P((int, int, int, char **, const char *));
+static int _secs __P((const struct tm *, char **, const char *));
+static size_t _fmt __P((const char *, const struct tm *, char **,
+ const char *));
+
+size_t
+strftime(s, maxsize, format, t)
+ char *s;
+ size_t maxsize;
+ const char *format;
+ const struct tm *t;
+{
+ char *pt;
+
+ tzset();
+ if (maxsize < 1)
+ return (0);
+
+ pt = s;
+ if (_fmt(format, t, &pt, s + maxsize)) {
+ *pt = '\0';
+ return (pt - s);
+ } else
+ return (0);
+}
+
+#define SUN_WEEK(t) (((t)->tm_yday + 7 - \
+ ((t)->tm_wday)) / 7)
+#define MON_WEEK(t) (((t)->tm_yday + 7 - \
+ ((t)->tm_wday ? (t)->tm_wday - 1 : 6)) / 7)
+
+static size_t
+_fmt(format, t, pt, ptlim)
+ const char *format;
+ const struct tm *t;
+ char **pt;
+ const char * const ptlim;
+{
+ for (; *format; ++format) {
+ if (*format == '%') {
+ ++format;
+ if (*format == 'E') {
+ /* Alternate Era */
+ ++format;
+ } else if (*format == 'O') {
+ /* Alternate numeric symbols */
+ ++format;
+ }
+ switch (*format) {
+ case '\0':
+ --format;
+ break;
+ case 'A':
+ if (t->tm_wday < 0 || t->tm_wday > 6)
+ return (0);
+ if (!_add(_CurrentTimeLocale->day[t->tm_wday],
+ pt, ptlim))
+ return (0);
+ continue;
+
+ case 'a':
+ if (t->tm_wday < 0 || t->tm_wday > 6)
+ return (0);
+ if (!_add(_CurrentTimeLocale->abday[t->tm_wday],
+ pt, ptlim))
+ return (0);
+ continue;
+ case 'B':
+ if (t->tm_mon < 0 || t->tm_mon > 11)
+ return (0);
+ if (!_add(_CurrentTimeLocale->mon[t->tm_mon],
+ pt, ptlim))
+ return (0);
+ continue;
+ case 'b':
+ case 'h':
+ if (t->tm_mon < 0 || t->tm_mon > 11)
+ return (0);
+ if (!_add(_CurrentTimeLocale->abmon[t->tm_mon],
+ pt, ptlim))
+ return (0);
+ continue;
+ case 'C':
+ if (!_conv((t->tm_year + TM_YEAR_BASE) / 100,
+ 2, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'c':
+ if (!_fmt(_CurrentTimeLocale->d_t_fmt, t, pt,
+ ptlim))
+ return (0);
+ continue;
+ case 'D':
+ if (!_fmt("%m/%d/%y", t, pt, ptlim))
+ return (0);
+ continue;
+ case 'd':
+ if (!_conv(t->tm_mday, 2, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'e':
+ if (!_conv(t->tm_mday, 2, ' ', pt, ptlim))
+ return (0);
+ continue;
+ case 'H':
+ if (!_conv(t->tm_hour, 2, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'I':
+ if (!_conv(t->tm_hour % 12 ?
+ t->tm_hour % 12 : 12, 2, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'j':
+ if (!_conv(t->tm_yday + 1, 3, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'k':
+ if (!_conv(t->tm_hour, 2, ' ', pt, ptlim))
+ return (0);
+ continue;
+ case 'l':
+ if (!_conv(t->tm_hour % 12 ?
+ t->tm_hour % 12: 12, 2, ' ', pt, ptlim))
+ return (0);
+ continue;
+ case 'M':
+ if (!_conv(t->tm_min, 2, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'm':
+ if (!_conv(t->tm_mon + 1, 2, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'n':
+ if (!_add("\n", pt, ptlim))
+ return (0);
+ continue;
+ case 'p':
+ if (!_add(_CurrentTimeLocale->am_pm[t->tm_hour
+ >= 12], pt, ptlim))
+ return (0);
+ continue;
+ case 'R':
+ if (!_fmt("%H:%M", t, pt, ptlim))
+ return (0);
+ continue;
+ case 'r':
+ if (!_fmt(_CurrentTimeLocale->t_fmt_ampm, t, pt,
+ ptlim))
+ return (0);
+ continue;
+ case 'S':
+ if (!_conv(t->tm_sec, 2, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 's':
+ if (!_secs(t, pt, ptlim))
+ return (0);
+ continue;
+ case 'T':
+ if (!_fmt("%H:%M:%S", t, pt, ptlim))
+ return (0);
+ continue;
+ case 't':
+ if (!_add("\t", pt, ptlim))
+ return (0);
+ continue;
+ case 'U':
+ if (!_conv(SUN_WEEK(t), 2, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'u':
+ if (!_conv(t->tm_wday ? t->tm_wday : 7, 1, '0',
+ pt, ptlim))
+ return (0);
+ continue;
+ case 'V': /* ISO 8601 week number */
+ case 'G': /* ISO 8601 year (four digits) */
+ case 'g': /* ISO 8601 year (two digits) */
+/*
+** From Arnold Robbins' strftime version 3.0: "the week number of the
+** year (the first Monday as the first day of week 1) as a decimal number
+** (01-53)."
+** (ado, 1993-05-24)
+**
+** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
+** "Week 01 of a year is per definition the first week which has the
+** Thursday in this year, which is equivalent to the week which contains
+** the fourth day of January. In other words, the first week of a new year
+** is the week which has the majority of its days in the new year. Week 01
+** might also contain days from the previous year and the week before week
+** 01 of a year is the last week (52 or 53) of the previous year even if
+** it contains days from the new year. A week starts with Monday (day 1)
+** and ends with Sunday (day 7). For example, the first week of the year
+** 1997 lasts from 1996-12-30 to 1997-01-05..."
+** (ado, 1996-01-02)
+*/
+ {
+ int year;
+ int yday;
+ int wday;
+ int w;
+
+ year = t->tm_year + TM_YEAR_BASE;
+ yday = t->tm_yday;
+ wday = t->tm_wday;
+ for ( ; ; ) {
+ int len;
+ int bot;
+ int top;
+
+ len = isleap(year) ?
+ DAYSPERLYEAR :
+ DAYSPERNYEAR;
+ /*
+ ** What yday (-3 ... 3) does
+ ** the ISO year begin on?
+ */
+ bot = ((yday + 11 - wday) %
+ DAYSPERWEEK) - 3;
+ /*
+ ** What yday does the NEXT
+ ** ISO year begin on?
+ */
+ top = bot -
+ (len % DAYSPERWEEK);
+ if (top < -3)
+ top += DAYSPERWEEK;
+ top += len;
+ if (yday >= top) {
+ ++year;
+ w = 1;
+ break;
+ }
+ if (yday >= bot) {
+ w = 1 + ((yday - bot) /
+ DAYSPERWEEK);
+ break;
+ }
+ --year;
+ yday += isleap(year) ?
+ DAYSPERLYEAR :
+ DAYSPERNYEAR;
+ }
+#ifdef XPG4_1994_04_09
+ if ((w == 52
+ && t->tm_mon == TM_JANUARY)
+ || (w == 1
+ && t->tm_mon == TM_DECEMBER))
+ w = 53;
+#endif /* defined XPG4_1994_04_09 */
+ if (*format == 'V') {
+ if (!_conv(w, 2, '0',
+ pt, ptlim))
+ return (0);
+ } else if (*format == 'g') {
+ if (!_conv(year % 100, 2, '0',
+ pt, ptlim))
+ return (0);
+ } else if (!_conv(year, 4, '0',
+ pt, ptlim))
+ return (0);
+ }
+ continue;
+ case 'W':
+ if (!_conv(MON_WEEK(t), 2, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'w':
+ if (!_conv(t->tm_wday, 1, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'x':
+ if (!_fmt(_CurrentTimeLocale->d_fmt, t, pt,
+ ptlim))
+ return (0);
+ continue;
+ case 'X':
+ if (!_fmt(_CurrentTimeLocale->t_fmt, t, pt,
+ ptlim))
+ return (0);
+ continue;
+ case 'y':
+ if (!_conv((t->tm_year + TM_YEAR_BASE) % 100,
+ 2, '0', pt, ptlim))
+ return (0);
+ continue;
+ case 'Y':
+ if (!_conv((t->tm_year + TM_YEAR_BASE), 4, '0',
+ pt, ptlim))
+ return (0);
+ continue;
+ case 'Z':
+ if (tzname[t->tm_isdst ? 1 : 0] &&
+ !_add(tzname[t->tm_isdst ? 1 : 0], pt,
+ ptlim))
+ return (0);
+ continue;
+ case '%':
+ /*
+ * X311J/88-090 (4.12.3.5): if conversion char is
+ * undefined, behavior is undefined. Print out the
+ * character itself as printf(3) does.
+ */
+ default:
+ break;
+ }
+ }
+ if (*pt == ptlim)
+ return (0);
+ *(*pt)++ = *format;
+ }
+ return (ptlim - *pt);
+}
+
+static int
+_secs(t, pt, ptlim)
+ const struct tm *t;
+ char **pt;
+ const char * const ptlim;
+{
+ char buf[15];
+ time_t s;
+ char *p;
+ struct tm tmp;
+
+ buf[sizeof (buf) - 1] = '\0';
+ /* Make a copy, mktime(3) modifies the tm struct. */
+ tmp = *t;
+ s = mktime(&tmp);
+ for (p = buf + sizeof(buf) - 2; s > 0 && p > buf; s /= 10)
+ *p-- = (char)(s % 10 + '0');
+ return (_add(++p, pt, ptlim));
+}
+
+static int
+_conv(n, digits, pad, pt, ptlim)
+ int n, digits;
+ int pad;
+ char **pt;
+ const char * const ptlim;
+{
+ char buf[10];
+ char *p;
+
+ buf[sizeof (buf) - 1] = '\0';
+ for (p = buf + sizeof(buf) - 2; n > 0 && p > buf; n /= 10, --digits)
+ *p-- = n % 10 + '0';
+ while (p > buf && digits-- > 0)
+ *p-- = pad;
+ return (_add(++p, pt, ptlim));
+}
+
+static int
+_add(str, pt, ptlim)
+ const char *str;
+ char **pt;
+ const char * const ptlim;
+{
+
+ for (;; ++(*pt)) {
+ if (*pt == ptlim)
+ return (0);
+ if ((**pt = *str++) == '\0')
+ return (1);
+ }
+}
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