561 lines
18 KiB
C
561 lines
18 KiB
C
/*
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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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*/
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#include "time_header.h"
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#include "time_local.h"
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static size_t _strftime(
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char * const s,
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const size_t maxsize,
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const char *const format,
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const struct tm *const t,
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struct lc_time_T* loc
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);
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static char* _add(const char *, char *, const char *);
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static char* _conv(int, const char *, char *, const char *);
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static char* _fmt(const char *, const struct tm *, char *, const char *, int *, struct lc_time_T*);
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static char* _yconv(int, int, bool, bool, char *, char const *);
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extern char* tzname[];
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#define IN_NONE 0
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#define IN_SOME 1
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#define IN_THIS 2
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#define IN_ALL 3
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static const unsigned long _fmtcallback[] = { 0x16c04e75 };
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size_t strftime(
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char * const s,
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size_t maxsize,
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const char *const format,
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const struct tm *const t
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)
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{
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return _strftime(s, maxsize, format, t, (struct lc_time_T*)&C_time_locale);
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}
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size_t strftime_l(
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char *s,
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size_t maxsize,
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char const *format,
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const struct tm *const t,
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locale_t locale
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)
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{
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size_t res;
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struct lc_time_T* l = openlc(locale);
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res = _strftime(s, maxsize, format, t, l);
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closelc(l);
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return res;
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}
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static size_t _strftime(
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char * const s,
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const size_t maxsize,
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const char *const format,
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const struct tm *t,
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struct lc_time_T* loc
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)
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{
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char *p;
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int warn;
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tzset();
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warn = IN_NONE;
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p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn, loc);
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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* _fmt(
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const char *format,
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const struct tm *const t,
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char * pt,
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const char *const ptlim,
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int *warnp,
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struct lc_time_T* loc
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)
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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 ||
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t->tm_wday >= DAYSPERWEEK) ?
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"?" : loc->weekday[t->tm_wday],
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pt, ptlim);
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continue;
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case 'a':
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pt = _add((t->tm_wday < 0 ||
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t->tm_wday >= DAYSPERWEEK) ?
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"?" : loc->wday[t->tm_wday],
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pt, ptlim);
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continue;
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case 'B':
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pt = _add((t->tm_mon < 0 ||
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t->tm_mon >= MONSPERYEAR) ?
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"?" : loc->month[t->tm_mon],
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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 ||
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t->tm_mon >= MONSPERYEAR) ?
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"?" : loc->mon[t->tm_mon],
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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, 1993-05-24)
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*/
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pt = _yconv(t->tm_year, TM_YEAR_BASE,
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true, false, pt, ptlim);
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continue;
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case 'c':
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{
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int warn2 = IN_SOME;
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pt = _fmt(loc->c_fmt, t, pt, ptlim, &warn2, loc);
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if (warn2 == IN_ALL)
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warn2 = IN_THIS;
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if (warn2 > *warnp)
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*warnp = warn2;
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}
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continue;
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case 'D':
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pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp, loc);
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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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** C99 locale modifiers.
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** The sequences
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** %Ec %EC %Ex %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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*/
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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 'F':
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pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp, loc);
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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, 1993-05-24)
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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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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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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, 1993-05-24)
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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 >= (HOURSPERDAY / 2)) ?
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loc->pm :
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loc->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, warnp, loc);
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continue;
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case 'r':
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pt = _fmt("%I:%M:%S %p", t, pt, ptlim, warnp, loc);
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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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{
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struct tm tm;
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time_t mkt;
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tm = *t;
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mkt = mktime(&tm);
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_conv(t->tm_sec, "%ld", pt, ptlim);
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}
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continue;
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case 'T':
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pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp, loc);
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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 + DAYSPERWEEK -
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t->tm_wday) / DAYSPERWEEK,
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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, 1993-05-24)
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*/
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pt = _conv((t->tm_wday == 0) ?
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DAYSPERWEEK : t->tm_wday,
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"%d", pt, ptlim);
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continue;
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case 'V': /* ISO 8601 week number */
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case 'G': /* ISO 8601 year (four digits) */
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case 'g': /* ISO 8601 year (two digits) */
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/*
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** From Arnold Robbins' strftime version 3.0: "the week number of the
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** year (the first Monday as the first day of week 1) as a decimal number
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** (01-53)."
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** (ado, 1993-05-24)
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**
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** From <http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html> by Markus Kuhn:
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** "Week 01 of a year is per definition the first week which has the
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** Thursday in this year, which is equivalent to the week which contains
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** the fourth day of January. In other words, the first week of a new year
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** is the week which has the majority of its days in the new year. Week 01
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** might also contain days from the previous year and the week before week
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** 01 of a year is the last week (52 or 53) of the previous year even if
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** it contains days from the new year. A week starts with Monday (day 1)
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** and ends with Sunday (day 7). For example, the first week of the year
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** 1997 lasts from 1996-12-30 to 1997-01-05..."
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** (ado, 1996-01-02)
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*/
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{
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int year;
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int base;
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int yday;
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int wday;
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int w;
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year = t->tm_year;
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base = TM_YEAR_BASE;
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yday = t->tm_yday;
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wday = t->tm_wday;
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for ( ; ; ) {
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int len;
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int bot;
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int top;
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len = isleap_sum(year, base) ?
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DAYSPERLYEAR :
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DAYSPERNYEAR;
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/*
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** What yday (-3 ... 3) does
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** the ISO year begin on?
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*/
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bot = ((yday + 11 - wday) %
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DAYSPERWEEK) - 3;
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/*
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** What yday does the NEXT
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** ISO year begin on?
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*/
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top = bot -
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(len % DAYSPERWEEK);
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if (top < -3)
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top += DAYSPERWEEK;
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top += len;
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if (yday >= top) {
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++base;
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w = 1;
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break;
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}
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if (yday >= bot) {
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w = 1 + ((yday - bot) /
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DAYSPERWEEK);
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break;
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}
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--base;
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yday += isleap_sum(year, base) ?
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DAYSPERLYEAR :
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DAYSPERNYEAR;
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}
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if (*format == 'V')
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pt = _conv(w, "%02d",
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pt, ptlim);
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else if (*format == 'g') {
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*warnp = IN_ALL;
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pt = _yconv(year, base,
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false, true,
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pt, ptlim);
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} else pt = _yconv(year, base,
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true, true,
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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, 1993-05-24)
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*/
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pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp, loc);
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continue;
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case 'W':
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pt = _conv((t->tm_yday + DAYSPERWEEK -
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(t->tm_wday ?
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(t->tm_wday - 1) :
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(DAYSPERWEEK - 1))) / DAYSPERWEEK,
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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 'X':
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pt = _fmt(loc->X_fmt, t, pt, ptlim, warnp, loc);
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continue;
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case 'x':
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{
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int warn2 = IN_SOME;
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pt = _fmt(loc->x_fmt, t, pt, ptlim, &warn2, loc);
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if (warn2 == IN_ALL)
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warn2 = IN_THIS;
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if (warn2 > *warnp)
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*warnp = warn2;
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}
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continue;
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case 'y':
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*warnp = IN_ALL;
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pt = _yconv(t->tm_year, TM_YEAR_BASE,
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false, true,
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pt, ptlim);
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continue;
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case 'Y':
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pt = _yconv(t->tm_year, TM_YEAR_BASE,
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true, true,
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pt, ptlim);
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continue;
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case 'Z':
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if (t->tm_zone != NULL)
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pt = _add(t->tm_zone, pt, ptlim);
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else if (t->tm_isdst >= 0)
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pt = _add(tzname[t->tm_isdst != 0],
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pt, ptlim);
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/*
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** C99 says that %Z must be replaced by the
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** empty string if the time zone is not
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** determinable.
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*/
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continue;
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case 'z':
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{
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long diff;
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char const * sign;
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if (t->tm_isdst < 0)
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continue;
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diff = t->tm_gmtoff;
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/*
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** C99 says that the UT offset must
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** be computed by looking only at
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** tm_isdst. This requirement is
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** incorrect, since it means the code
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** must rely on magic (in this case
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** altzone and timezone), and the
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** magic might not have the correct
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** offset. Doing things correctly is
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** tricky and requires disobeying C99;
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** see GNU C strftime for details.
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** For now, punt and conform to the
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** standard, even though it's incorrect.
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**
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** C99 says that %z must be replaced by the
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** empty string if the time zone is not
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** determinable, so output nothing if the
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** appropriate variables are not available.
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*/
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if (t->tm_isdst == 0) {
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diff = -timezone;
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} else {
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diff = -altzone;
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}
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if (diff < 0) {
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sign = "-";
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diff = -diff;
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} else sign = "+";
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pt = _add(sign, pt, ptlim);
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diff /= SECSPERMIN;
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diff = (diff / MINSPERHOUR) * 100 +
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(diff % MINSPERHOUR);
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pt = _conv(diff, "%04d", pt, ptlim);
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}
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continue;
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case '+':
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pt = _fmt(loc->date_fmt, t, pt, ptlim,
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warnp, loc);
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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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struct param {
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int16_t val;
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char* end;
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};
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|
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static char* _conv(
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const int n,
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const char *const format,
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char *const pt,
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const char *const ptlim
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)
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{
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char buf[16];
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struct param out;
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out.val = (int16_t)n;
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out.end = NULL;
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RawDoFmt(
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(APTR)format, (APTR)&out,
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(void (*)(void))&_fmtcallback, buf);
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return _add(buf, pt, ptlim);
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}
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static char* _add(
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const char *str,
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char *pt,
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const char *const ptlim
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)
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{
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while (pt < ptlim && (*pt = *str++) != '\0') {
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++pt;
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}
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return pt;
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}
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/**
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*
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* POSIX and the C Standard are unclear or inconsistent about
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* what %C and %y do if the year is negative or exceeds 9999.
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* Use the convention that %C concatenated with %y yields the
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* same output as %Y, and that %Y contains at least 4 bytes,
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* with more only if necessary.
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*
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*/
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static char* _yconv(
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int a,
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int b,
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bool convert_top,
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bool convert_yy,
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char *pt,
|
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const char *const ptlim
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|
)
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|
{
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|
int lead;
|
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int trail;
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#define DIVISOR 100
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trail = a % DIVISOR + b % DIVISOR;
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lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
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trail %= DIVISOR;
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if (trail < 0 && lead > 0) {
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trail += DIVISOR;
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--lead;
|
|
} else if (lead < 0 && trail > 0) {
|
|
trail -= DIVISOR;
|
|
++lead;
|
|
}
|
|
if (convert_top) {
|
|
if (lead == 0 && trail < 0)
|
|
pt = _add("-0", pt, ptlim);
|
|
else pt = _conv(lead, "%02d", pt, ptlim);
|
|
}
|
|
if (convert_yy)
|
|
pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim);
|
|
return pt;
|
|
}
|