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-rw-r--r--lib/libc/string/strftime.c317
1 files changed, 317 insertions, 0 deletions
diff --git a/lib/libc/string/strftime.c b/lib/libc/string/strftime.c
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+/*
+ * 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 1.1.1.1 1995/10/18 08:42:22 deraadt Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/localedef.h>
+#include <locale.h>
+#include <string.h>
+#include <tzfile.h>
+#include <time.h>
+
+static size_t gsize;
+static char *pt;
+static int _add(), _conv(), _secs();
+static size_t _fmt();
+
+size_t
+strftime(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)
+ register char *format;
+ 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, 2, '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);
+
+ if (((t->tm_yday + 7 - (t->tm_wday + 1)) % 7) >= 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;
+ case 'Z':
+ if (t->tm_zone && !_add(t->tm_zone))
+ 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 (!gsize--)
+ return(0);
+ *pt++ = *format;
+ }
+ return(gsize);
+}
+
+static
+_secs(t)
+ 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-- = s % 10 + '0';
+ return(_add(++p));
+}
+
+static
+_conv(n, digits, pad)
+ int n, digits;
+ char pad;
+{
+ static char buf[10];
+ register char *p;
+
+ 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));
+}
+
+static
+_add(str)
+ register char *str;
+{
+ for (;; ++pt, --gsize) {
+ if (!gsize)
+ return(0);
+ if (!(*pt = *str++))
+ return(1);
+ }
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.