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+/*
+ * strftime.c --
+ *
+ * This file contains a modified version of the BSD 4.4 strftime
+ * function.
+ *
+ * This file is a modified version of the strftime.c file from the BSD 4.4
+ * source. See the copyright notice below for details on redistribution
+ * restrictions. The "license.terms" file does not apply to this file.
+ *
+ * SCCS: @(#) strftime.c 1.4 97/08/07 17:17:02
+ */
+
+/*
+ * 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)
+/*static char *sccsid = "from: @(#)strftime.c 5.11 (Berkeley) 2/24/91";*/
+static char *rcsid = "$Id: strftime.c,v 1.1 1998/03/26 14:46:31 rjohnson Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <time.h>
+#include <string.h>
+#include <locale.h>
+#include "tclInt.h"
+#include "tclPort.h"
+
+#define TM_YEAR_BASE 1900
+
+typedef struct {
+ const char *abday[7];
+ const char *day[7];
+ const char *abmon[12];
+ const char *mon[12];
+ const char *am_pm[2];
+ const char *d_t_fmt;
+ const char *d_fmt;
+ const char *t_fmt;
+ const char *t_fmt_ampm;
+} _TimeLocale;
+
+static const _TimeLocale _DefaultTimeLocale =
+{
+ {
+ "Sun","Mon","Tue","Wed","Thu","Fri","Sat",
+ },
+ {
+ "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
+ "Friday", "Saturday"
+ },
+ {
+ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+ "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+ },
+ {
+ "January", "February", "March", "April", "May", "June", "July",
+ "August", "September", "October", "November", "December"
+ },
+ {
+ "AM", "PM"
+ },
+ "%a %b %d %H:%M:%S %Y",
+ "%m/%d/%y",
+ "%H:%M:%S",
+ "%I:%M:%S %p"
+};
+
+static const _TimeLocale *_CurrentTimeLocale = &_DefaultTimeLocale;
+
+static size_t gsize;
+static char *pt;
+static int _add _ANSI_ARGS_((const char* str));
+static int _conv _ANSI_ARGS_((int n, int digits, int pad));
+static int _secs _ANSI_ARGS_((const struct tm *t));
+static size_t _fmt _ANSI_ARGS_((const char *format,
+ const struct tm *t));
+
+size_t
+TclStrftime(s, maxsize, format, t)
+ char *s;
+ size_t maxsize;
+ const char *format;
+ const struct tm *t;
+{
+ tzset();
+
+ pt = s;
+ if ((gsize = maxsize) < 1)
+ return(0);
+ if (_fmt(format, t)) {
+ *pt = '\0';
+ return(maxsize - gsize);
+ }
+ 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)
+ const char *format;
+ const struct tm *t;
+{
+ 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]))
+ return(0);
+ continue;
+ case 'a':
+ if (t->tm_wday < 0 || t->tm_wday > 6)
+ return(0);
+ if (!_add(_CurrentTimeLocale->abday[t->tm_wday]))
+ return(0);
+ continue;
+ case 'B':
+ if (t->tm_mon < 0 || t->tm_mon > 11)
+ return(0);
+ if (!_add(_CurrentTimeLocale->mon[t->tm_mon]))
+ 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]))
+ return(0);
+ continue;
+ case 'C':
+ if (!_conv((t->tm_year + TM_YEAR_BASE) / 100,
+ 2, '0'))
+ return(0);
+ continue;
+ case 'c':
+ if (!_fmt(_CurrentTimeLocale->d_t_fmt, t))
+ return(0);
+ continue;
+ case 'D':
+ if (!_fmt("%m/%d/%y", t))
+ return(0);
+ continue;
+ case 'd':
+ if (!_conv(t->tm_mday, 2, '0'))
+ return(0);
+ continue;
+ case 'e':
+ if (!_conv(t->tm_mday, 2, ' '))
+ return(0);
+ continue;
+ case 'H':
+ if (!_conv(t->tm_hour, 2, '0'))
+ return(0);
+ continue;
+ case 'I':
+ if (!_conv(t->tm_hour % 12 ?
+ t->tm_hour % 12 : 12, 2, '0'))
+ return(0);
+ continue;
+ case 'j':
+ if (!_conv(t->tm_yday + 1, 3, '0'))
+ return(0);
+ continue;
+ case 'k':
+ if (!_conv(t->tm_hour, 2, ' '))
+ return(0);
+ continue;
+ case 'l':
+ if (!_conv(t->tm_hour % 12 ?
+ t->tm_hour % 12: 12, 2, ' '))
+ return(0);
+ continue;
+ case 'M':
+ if (!_conv(t->tm_min, 2, '0'))
+ return(0);
+ continue;
+ case 'm':
+ if (!_conv(t->tm_mon + 1, 2, '0'))
+ return(0);
+ continue;
+ case 'n':
+ if (!_add("\n"))
+ return(0);
+ continue;
+ case 'p':
+ if (!_add(_CurrentTimeLocale->am_pm[t->tm_hour >= 12]))
+ return(0);
+ continue;
+ case 'R':
+ if (!_fmt("%H:%M", t))
+ return(0);
+ continue;
+ case 'r':
+ if (!_fmt(_CurrentTimeLocale->t_fmt_ampm, t))
+ return(0);
+ continue;
+ case 'S':
+ if (!_conv(t->tm_sec, 2, '0'))
+ return(0);
+ continue;
+ case 's':
+ if (!_secs(t))
+ return(0);
+ continue;
+ case 'T':
+ if (!_fmt("%H:%M:%S", t))
+ return(0);
+ continue;
+ case 't':
+ if (!_add("\t"))
+ return(0);
+ continue;
+ case 'U':
+ if (!_conv(SUN_WEEK(t), 2, '0'))
+ return(0);
+ continue;
+ case 'u':
+ if (!_conv(t->tm_wday ? t->tm_wday : 7, 1, '0'))
+ return(0);
+ continue;
+ case 'V':
+ {
+ /* ISO 8601 Week Of Year:
+ If the week (Monday - Sunday) containing
+ January 1 has four or more days in the new
+ year, then it is week 1; otherwise it is
+ week 53 of the previous year and the next
+ week is week one. */
+
+ int week = MON_WEEK(t);
+
+ int days = (((t)->tm_yday + 7 - \
+ ((t)->tm_wday ? (t)->tm_wday - 1 : 6)) % 7);
+
+
+ if (days >= 4) {
+ week++;
+ } else if (week == 0) {
+ week = 53;
+ }
+
+ if (!_conv(week, 2, '0'))
+ return(0);
+ continue;
+ }
+ case 'W':
+ if (!_conv(MON_WEEK(t), 2, '0'))
+ return(0);
+ continue;
+ case 'w':
+ if (!_conv(t->tm_wday, 1, '0'))
+ return(0);
+ continue;
+ case 'x':
+ if (!_fmt(_CurrentTimeLocale->d_fmt, t))
+ return(0);
+ continue;
+ case 'X':
+ if (!_fmt(_CurrentTimeLocale->t_fmt, t))
+ return(0);
+ continue;
+ case 'y':
+ if (!_conv((t->tm_year + TM_YEAR_BASE) % 100,
+ 2, '0'))
+ return(0);
+ continue;
+ case 'Y':
+ if (!_conv((t->tm_year + TM_YEAR_BASE), 4, '0'))
+ return(0);
+ continue;
+#ifndef MAC_TCL
+ case 'Z': {
+ char *name = TclpGetTZName();
+ if (name && !_add(name)) {
+ return 0;
+ }
+ continue;
+ }
+#endif
+ 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 (!gsize--)
+ return(0);
+ *pt++ = *format;
+ }
+ return(gsize);
+}
+
+static int
+_secs(t)
+ const struct tm *t;
+{
+ static char buf[15];
+ register time_t s;
+ register char *p;
+ struct tm tmp;
+
+ /* 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));
+}
+
+static int
+_conv(n, digits, pad)
+ int n, digits;
+ int pad;
+{
+ static char buf[10];
+ register char *p;
+
+ for (p = buf + sizeof(buf) - 2; n > 0 && p > buf; n /= 10, --digits)
+ *p-- = (char)(n % 10 + '0');
+ while (p > buf && digits-- > 0)
+ *p-- = (char) pad;
+ return(_add(++p));
+}
+
+static int
+_add(str)
+ const char *str;
+{
+ for (;; ++pt, --gsize) {
+ if (!gsize)
+ return(0);
+ if (!(*pt = *str++))
+ return(1);
+ }
+}