416 lines
10 KiB
C
416 lines
10 KiB
C
#ifndef lint
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#ifndef NOID
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static char elsieid[] = "@(#)strftime.c 7.19";
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/*
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** Based on the UCB version with the ID appearing below.
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** This is ANSIish only when time is treated identically in all locales and
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** when "multibyte character == plain character".
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*/
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#endif /* !defined NOID */
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#endif /* !defined lint */
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#include "private.h"
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/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef LIBC_SCCS
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#ifndef lint
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static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
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#endif /* !defined lint */
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#endif /* !defined LIBC_SCCS */
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#include "tzfile.h"
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static const char afmt[][4] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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static const char Afmt[][10] = {
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"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
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"Saturday"
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};
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static const char bfmt[][4] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
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"Oct", "Nov", "Dec"
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};
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static const char Bfmt[][10] = {
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"January", "February", "March", "April", "May", "June", "July",
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"August", "September", "October", "November", "December"
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};
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static char *_add P((const char *, char *, const char *));
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static char *_conv P((int, const char *, char *, const char *));
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static char *_fmt P((const char *, const struct tm *, char *, const char *));
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static char *_secs P((const struct tm *, char *, const char *));
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size_t strftime P((char *, size_t, const char *, const struct tm *));
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extern char *tzname[];
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size_t
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strftime(s, maxsize, format, t)
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char *s;
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size_t maxsize;
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const char *format;
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const struct tm *t;
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{
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char *p;
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p = _fmt(format, t, s, s + maxsize);
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if (p == s + maxsize)
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return 0;
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*p = '\0';
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return p - s;
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}
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static char *
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_fmt(format, t, pt, ptlim)
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const char *format;
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const struct tm *t;
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char *pt;
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const char *ptlim;
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{
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for (; *format; ++format) {
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if (*format == '%') {
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label:
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switch(*++format) {
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case '\0':
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--format;
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break;
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case 'A':
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pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ?
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"?" : Afmt[t->tm_wday], pt, ptlim);
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continue;
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case 'a':
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pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ?
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"?" : afmt[t->tm_wday], pt, ptlim);
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continue;
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case 'B':
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pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ?
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"?" : Bfmt[t->tm_mon], pt, ptlim);
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continue;
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case 'b':
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case 'h':
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pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ?
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"?" : bfmt[t->tm_mon], pt, ptlim);
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continue;
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case 'c':
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pt = _fmt("%D %X", t, pt, ptlim);
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continue;
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case 'C':
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/*
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** %C used to do a...
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** _fmt("%a %b %e %X %Y", t);
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** ...whereas now POSIX 1003.2 calls for
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** something completely different.
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** (ado, 5/24/93)
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*/
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pt = _conv((t->tm_year + TM_YEAR_BASE) / 100,
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"%02d", pt, ptlim);
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continue;
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case 'D':
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pt = _fmt("%m/%d/%y", t, pt, ptlim);
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continue;
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case 'x':
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/*
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** Version 3.0 of strftime from Arnold Robbins
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** (arnold@skeeve.atl.ga.us) does the
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** equivalent of...
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** _fmt("%a %b %e %Y");
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** ...for %x; since the X3J11 C language
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** standard calls for "date, using locale's
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** date format," anything goes. Using just
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** numbers (as here) makes Quakers happier.
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** Word from Paul Eggert (eggert@twinsun.com)
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** is that %Y-%m-%d is the ISO standard date
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** format, specified in ISO 2014 and later
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** ISO 8601:1988, with a summary available in
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** pub/doc/ISO/english/ISO8601.ps.Z on
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** ftp.uni-erlangen.de.
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** (ado, 5/30/93)
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*/
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pt = _fmt("%m/%d/%y", t, pt, ptlim);
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continue;
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case 'd':
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pt = _conv(t->tm_mday, "%02d", pt, ptlim);
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continue;
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case 'E':
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case 'O':
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/*
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** POSIX locale extensions, a la
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** Arnold Robbins' strftime version 3.0.
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** The sequences
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** %Ec %EC %Ex %Ey %EY
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** %Od %oe %OH %OI %Om %OM
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** %OS %Ou %OU %OV %Ow %OW %Oy
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** are supposed to provide alternate
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** representations.
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** (ado, 5/24/93)
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*/
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goto label;
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case 'e':
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pt = _conv(t->tm_mday, "%2d", pt, ptlim);
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continue;
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case 'H':
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pt = _conv(t->tm_hour, "%02d", pt, ptlim);
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continue;
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case 'I':
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pt = _conv((t->tm_hour % 12) ?
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(t->tm_hour % 12) : 12,
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"%02d", pt, ptlim);
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continue;
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case 'j':
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pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim);
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continue;
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case 'k':
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/*
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** This used to be...
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** _conv(t->tm_hour % 12 ?
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** t->tm_hour % 12 : 12, 2, ' ');
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** ...and has been changed to the below to
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** match SunOS 4.1.1 and Arnold Robbins'
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** strftime version 3.0. That is, "%k" and
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** "%l" have been swapped.
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** (ado, 5/24/93)
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*/
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pt = _conv(t->tm_hour, "%2d", pt, ptlim);
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continue;
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#ifdef KITCHEN_SINK
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case 'K':
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/*
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** After all this time, still unclaimed!
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*/
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pt = _add("kitchen sink", pt, ptlim);
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continue;
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#endif /* defined KITCHEN_SINK */
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case 'l':
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/*
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** This used to be...
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** _conv(t->tm_hour, 2, ' ');
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** ...and has been changed to the below to
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** match SunOS 4.1.1 and Arnold Robbin's
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** strftime version 3.0. That is, "%k" and
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** "%l" have been swapped.
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** (ado, 5/24/93)
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*/
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pt = _conv((t->tm_hour % 12) ?
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(t->tm_hour % 12) : 12,
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"%2d", pt, ptlim);
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continue;
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case 'M':
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pt = _conv(t->tm_min, "%02d", pt, ptlim);
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continue;
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case 'm':
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pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim);
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continue;
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case 'n':
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pt = _add("\n", pt, ptlim);
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continue;
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case 'p':
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pt = _add(t->tm_hour >= 12 ? "PM" : "AM",
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pt, ptlim);
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continue;
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case 'R':
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pt = _fmt("%H:%M", t, pt, ptlim);
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continue;
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case 'r':
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pt = _fmt("%I:%M:%S %p", t, pt, ptlim);
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continue;
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case 'S':
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pt = _conv(t->tm_sec, "%02d", pt, ptlim);
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continue;
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case 's':
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pt = _secs(t, pt, ptlim);
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continue;
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case 'T':
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case 'X':
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pt = _fmt("%H:%M:%S", t, pt, ptlim);
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continue;
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case 't':
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pt = _add("\t", pt, ptlim);
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continue;
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case 'U':
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pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7,
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"%02d", pt, ptlim);
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continue;
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case 'u':
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/*
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** From Arnold Robbins' strftime version 3.0:
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** "ISO 8601: Weekday as a decimal number
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** [1 (Monday) - 7]"
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** (ado, 5/24/93)
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*/
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pt = _conv((t->tm_wday == 0) ? 7 : t->tm_wday,
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"%d", pt, ptlim);
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continue;
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case 'V':
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/*
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** From Arnold Robbins' strftime version 3.0:
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** "the week number of the year (the first
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** Monday as the first day of week 1) as a
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** decimal number (01-53). The method for
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** determining the week number is as specified
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** by ISO 8601 (to wit: if the week containing
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** January 1 has four or more days in the new
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** year, then it is week 1, otherwise it is
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** week 53 of the previous year and the next
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** week is week 1)."
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** (ado, 5/24/93)
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*/
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/*
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** XXX--If January 1 falls on a Friday,
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** January 1-3 are part of week 53 of the
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** previous year. By analogy, if January
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** 1 falls on a Thursday, are December 29-31
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** of the PREVIOUS year part of week 1???
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** (ado 5/24/93)
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**
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** You are understood not to expect this.
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*/
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{
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int i;
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i = (t->tm_yday + 10 - (t->tm_wday ?
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(t->tm_wday - 1) : 6)) / 7;
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if (i == 0) {
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/*
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** What day of the week does
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** January 1 fall on?
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*/
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i = t->tm_wday -
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(t->tm_yday - 1);
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/*
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** Fri Jan 1: 53
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** Sun Jan 1: 52
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** Sat Jan 1: 53 if previous
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** year a leap
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** year, else 52
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*/
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if (i == TM_FRIDAY)
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i = 53;
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else if (i == TM_SUNDAY)
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i = 52;
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else i = isleap(t->tm_year +
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TM_YEAR_BASE) ?
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53 : 52;
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#ifdef XPG4_1994_04_09
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/*
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** As of 4/9/94, though,
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** XPG4 calls for 53
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** unconditionally.
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*/
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i = 53;
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#endif /* defined XPG4_1994_04_09 */
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}
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pt = _conv(i, "%02d", pt, ptlim);
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}
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continue;
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case 'v':
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/*
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** From Arnold Robbins' strftime version 3.0:
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** "date as dd-bbb-YYYY"
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** (ado, 5/24/93)
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*/
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pt = _fmt("%e-%b-%Y", t, pt, ptlim);
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continue;
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case 'W':
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pt = _conv((t->tm_yday + 7 -
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(t->tm_wday ?
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(t->tm_wday - 1) : 6)) / 7,
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"%02d", pt, ptlim);
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continue;
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case 'w':
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pt = _conv(t->tm_wday, "%d", pt, ptlim);
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continue;
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case 'y':
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pt = _conv((t->tm_year + TM_YEAR_BASE) % 100,
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"%02d", pt, ptlim);
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continue;
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case 'Y':
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pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d",
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pt, ptlim);
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continue;
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case 'Z':
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#ifdef TM_ZONE
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if (t->TM_ZONE)
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pt = _add(t->TM_ZONE, pt, ptlim);
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else
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#endif /* defined TM_ZONE */
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if (t->tm_isdst == 0 || t->tm_isdst == 1) {
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pt = _add(tzname[t->tm_isdst],
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pt, ptlim);
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} else pt = _add("?", pt, ptlim);
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continue;
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case '%':
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/*
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* X311J/88-090 (4.12.3.5): if conversion char is
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* undefined, behavior is undefined. Print out the
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* character itself as printf(3) also does.
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*/
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default:
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break;
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}
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}
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if (pt == ptlim)
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break;
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*pt++ = *format;
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}
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return pt;
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}
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static char *
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_conv(n, format, pt, ptlim)
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int n;
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const char *format;
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char *pt;
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const char *ptlim;
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{
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char buf[INT_STRLEN_MAXIMUM(int) + 1];
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(void) sprintf(buf, format, n);
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return _add(buf, pt, ptlim);
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}
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static char *
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_secs(t, pt, ptlim)
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const struct tm *t;
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char *pt;
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const char *ptlim;
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{
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static char buf[INT_STRLEN_MAXIMUM(int) + 1];
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register time_t s;
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register char *p;
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struct tm tmp;
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/* Make a copy, mktime(3) modifies the tm struct. */
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tmp = *t;
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s = mktime(&tmp);
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(void) sprintf(buf, "%d", s);
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return(_add(buf, pt, ptlim));
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}
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static char *
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_add(str, pt, ptlim)
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const char *str;
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char *pt;
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const char *ptlim;
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{
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while (pt < ptlim && (*pt = *str++) != '\0')
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++pt;
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return pt;
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}
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