+/*
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifdef LIBC_RCS
+static const char rcsid[] =
+ "$FreeBSD: src/lib/libc/stdtime/strftime.c,v 1.25.2.3 2001/02/18 04:06:49 kris Exp $";
+#endif
+
+#ifndef lint
+#ifndef NOID
+static const char elsieid[] = "@(#)strftime.c 7.38";
+/*
+** Based on the UCB version with the ID appearing below.
+** This is ANSIish only when "multibyte character == plain character".
+*/
+#endif /* !defined NOID */
+#endif /* !defined lint */
+
+#include "private.h"
+
+#ifndef LIBC_SCCS
+#ifndef lint
+static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
+#endif /* !defined lint */
+#endif /* !defined LIBC_SCCS */
+
+#include "tzfile.h"
+#include <fcntl.h>
+#include <sys/stat.h>
+#include "timelocal.h"
+
+static char * _add P((const char *, char *, const char *));
+static char * _conv P((int, const char *, char *, const char *));
+static char * _fmt P((const char *, const struct tm *, char *, const char *));
+
+size_t strftime P((char *, size_t, const char *, const struct tm *));
+
+extern char * tzname[];
+
+size_t
+strftime(s, maxsize, format, t)
+ char *const s;
+ const size_t maxsize;
+ const char *const format;
+ const struct tm *const t;
+{
+ char *p;
+
+ tzset();
+ p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize);
+ if (p == s + maxsize)
+ return 0;
+ *p = '\0';
+ return p - s;
+}
+
+static char *
+_fmt(format, t, pt, ptlim)
+ const char *format;
+ const struct tm *const t;
+ char *pt;
+ const char *const ptlim;
+{
+ int Ealternative, Oalternative;
+
+ for ( ; *format; ++format) {
+ if (*format == '%') {
+ Ealternative = 0;
+ Oalternative = 0;
+label:
+ switch (*++format) {
+ case '\0':
+ --format;
+ break;
+ case 'A':
+ pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ?
+ "?" : Locale->weekday[t->tm_wday],
+ pt, ptlim);
+ continue;
+ case 'a':
+ pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ?
+ "?" : Locale->wday[t->tm_wday],
+ pt, ptlim);
+ continue;
+ case 'B':
+ pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ?
+ "?" : (Oalternative ? Locale->alt_month :
+ Locale->month)[t->tm_mon],
+ pt, ptlim);
+ continue;
+ case 'b':
+ case 'h':
+ pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ?
+ "?" : Locale->mon[t->tm_mon],
+ pt, ptlim);
+ continue;
+ case 'C':
+ /*
+ ** %C used to do a...
+ ** _fmt("%a %b %e %X %Y", t);
+ ** ...whereas now POSIX 1003.2 calls for
+ ** something completely different.
+ ** (ado, 5/24/93)
+ */
+ pt = _conv((t->tm_year + TM_YEAR_BASE) / 100,
+ "%02d", pt, ptlim);
+ continue;
+ case 'c':
+ /* NOTE: c_fmt is intentionally ignored */
+ pt = _fmt("%a %Ef %T %Y", t, pt, ptlim);
+ continue;
+ case 'D':
+ pt = _fmt("%m/%d/%y", t, pt, ptlim);
+ continue;
+ case 'd':
+ pt = _conv(t->tm_mday, "%02d", pt, ptlim);
+ continue;
+ case 'E':
+ if (Ealternative || Oalternative)
+ break;
+ Ealternative++;
+ goto label;
+ case 'O':
+ /*
+ ** POSIX locale extensions, a la
+ ** Arnold Robbins' strftime version 3.0.
+ ** The sequences
+ ** %Ec %EC %Ex %EX %Ey %EY
+ ** %Od %oe %OH %OI %Om %OM
+ ** %OS %Ou %OU %OV %Ow %OW %Oy
+ ** are supposed to provide alternate
+ ** representations.
+ ** (ado, 5/24/93)
+ **
+ ** FreeBSD extensions
+ ** %OB %Ef %EF
+ */
+ if (Ealternative || Oalternative)
+ break;
+ Oalternative++;
+ goto label;
+ case 'e':
+ pt = _conv(t->tm_mday, "%2d", pt, ptlim);
+ continue;
+ case 'f':
+ if (!Ealternative)
+ break;
+ pt = _fmt(Locale->Ef_fmt, t, pt, ptlim);
+ continue;
+ case 'F':
+ if (!Ealternative)
+ break;
+ pt = _fmt(Locale->EF_fmt, t, pt, ptlim);
+ continue;
+ case 'H':
+ pt = _conv(t->tm_hour, "%02d", pt, ptlim);
+ continue;
+ case 'I':
+ pt = _conv((t->tm_hour % 12) ?
+ (t->tm_hour % 12) : 12,
+ "%02d", pt, ptlim);
+ continue;
+ case 'j':
+ pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim);
+ continue;
+ case 'k':
+ /*
+ ** This used to be...
+ ** _conv(t->tm_hour % 12 ?
+ ** t->tm_hour % 12 : 12, 2, ' ');
+ ** ...and has been changed to the below to
+ ** match SunOS 4.1.1 and Arnold Robbins'
+ ** strftime version 3.0. That is, "%k" and
+ ** "%l" have been swapped.
+ ** (ado, 5/24/93)
+ */
+ pt = _conv(t->tm_hour, "%2d", pt, ptlim);
+ continue;
+#ifdef KITCHEN_SINK
+ case 'K':
+ /*
+ ** After all this time, still unclaimed!
+ */
+ pt = _add("kitchen sink", pt, ptlim);
+ continue;
+#endif /* defined KITCHEN_SINK */
+ case 'l':
+ /*
+ ** This used to be...
+ ** _conv(t->tm_hour, 2, ' ');
+ ** ...and has been changed to the below to
+ ** match SunOS 4.1.1 and Arnold Robbin's
+ ** strftime version 3.0. That is, "%k" and
+ ** "%l" have been swapped.
+ ** (ado, 5/24/93)
+ */
+ pt = _conv((t->tm_hour % 12) ?
+ (t->tm_hour % 12) : 12,
+ "%2d", pt, ptlim);
+ continue;
+ case 'M':
+ pt = _conv(t->tm_min, "%02d", pt, ptlim);
+ continue;
+ case 'm':
+ pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim);
+ continue;
+ case 'n':
+ pt = _add("\n", pt, ptlim);
+ continue;
+ case 'p':
+ pt = _add((t->tm_hour >= 12) ?
+ Locale->pm :
+ Locale->am,
+ pt, ptlim);
+ continue;
+ case 'R':
+ pt = _fmt("%H:%M", t, pt, ptlim);
+ continue;
+ case 'r':
+ pt = _fmt("%I:%M:%S %p", t, pt, ptlim);
+ continue;
+ case 'S':
+ pt = _conv(t->tm_sec, "%02d", pt, ptlim);
+ continue;
+ case 's':
+ {
+ struct tm tm;
+ char buf[INT_STRLEN_MAXIMUM(
+ time_t) + 1];
+ time_t mkt;
+
+ tm = *t;
+ mkt = mktime(&tm);
+ if (TYPE_SIGNED(time_t))
+ (void) sprintf(buf, "%ld",
+ (long) mkt);
+ else (void) sprintf(buf, "%lu",
+ (unsigned long) mkt);
+ pt = _add(buf, pt, ptlim);
+ }
+ continue;
+ case 'T':
+ pt = _fmt("%H:%M:%S", t, pt, ptlim);
+ continue;
+ case 't':
+ pt = _add("\t", pt, ptlim);
+ continue;
+ case 'U':
+ pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7,
+ "%02d", pt, ptlim);
+ continue;
+ case 'u':
+ /*
+ ** From Arnold Robbins' strftime version 3.0:
+ ** "ISO 8601: Weekday as a decimal number
+ ** [1 (Monday) - 7]"
+ ** (ado, 5/24/93)
+ */
+ pt = _conv((t->tm_wday == 0) ? 7 : t->tm_wday,
+ "%d", pt, ptlim);
+ 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')
+ pt = _conv(w, "%02d",
+ pt, ptlim);
+ else if (*format == 'g') {
+ pt = _conv(year % 100, "%02d",
+ pt, ptlim);
+ } else pt = _conv(year, "%04d",
+ pt, ptlim);
+ }
+ continue;
+ case 'v':
+ /*
+ ** From Arnold Robbins' strftime version 3.0:
+ ** "date as dd-bbb-YYYY"
+ ** (ado, 5/24/93)
+ */
+ pt = _fmt("%e-%b-%Y", t, pt, ptlim);
+ continue;
+ case 'W':
+ pt = _conv((t->tm_yday + 7 -
+ (t->tm_wday ?
+ (t->tm_wday - 1) : 6)) / 7,
+ "%02d", pt, ptlim);
+ continue;
+ case 'w':
+ pt = _conv(t->tm_wday, "%d", pt, ptlim);
+ continue;
+ case 'X':
+ pt = _fmt(Locale->X_fmt, t, pt, ptlim);
+ continue;
+ case 'x':
+ pt = _fmt(Locale->x_fmt, t, pt, ptlim);
+ continue;
+ case 'y':
+ pt = _conv((t->tm_year + TM_YEAR_BASE) % 100,
+ "%02d", pt, ptlim);
+ continue;
+ case 'Y':
+ pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d",
+ pt, ptlim);
+ continue;
+ case 'Z':
+ if (t->tm_zone != NULL)
+ pt = _add(t->tm_zone, pt, ptlim);
+ else
+ if (t->tm_isdst == 0 || t->tm_isdst == 1) {
+ pt = _add(tzname[t->tm_isdst],
+ pt, ptlim);
+ } else pt = _add("?", pt, ptlim);
+ continue;
+ case 'z':
+ {
+ long absoff;
+ if (t->tm_gmtoff >= 0) {
+ absoff = t->tm_gmtoff;
+ pt = _add("+", pt, ptlim);
+ } else {
+ absoff = -t->tm_gmtoff;
+ pt = _add("-", pt, ptlim);
+ }
+ pt = _conv(absoff / 3600, "%02d",
+ pt, ptlim);
+ pt = _conv((absoff % 3600) / 60, "%02d",
+ pt, ptlim);
+ };
+ continue;
+ case '+':
+ pt = _fmt(Locale->date_fmt, t, pt, ptlim);
+ 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) also does.
+ */
+ default:
+ break;
+ }
+ }
+ if (pt == ptlim)
+ break;
+ *pt++ = *format;
+ }
+ return pt;
+}
+
+static char *
+_conv(n, format, pt, ptlim)
+ const int n;
+ const char *const format;
+ char *const pt;
+ const char *const ptlim;
+{
+ char buf[INT_STRLEN_MAXIMUM(int) + 1];
+
+ (void) sprintf(buf, format, n);
+ return _add(buf, pt, ptlim);
+}
+
+static char *
+_add(str, pt, ptlim)
+ const char *str;
+ char *pt;
+ const char *const ptlim;
+{
+ while (pt < ptlim && (*pt = *str++) != '\0')
+ ++pt;
+ return pt;
+}
projects / apple / libc.git / blobdiff