395 lines
13 KiB
C
395 lines
13 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ 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. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/assert.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/fmt/fmt.h"
|
|
#include "libc/macros.h"
|
|
#include "libc/nexgen32e/nexgen32e.h"
|
|
#include "libc/time/struct/tm.h"
|
|
#include "libc/time/time.h"
|
|
#include "libc/time/tzfile.internal.h"
|
|
|
|
STATIC_YOINK("ntoa");
|
|
|
|
asm(".ident\t\"\\n\\n\
|
|
strftime (BSD-3)\\n\
|
|
Copyright 1989 The Regents of the University of California\"");
|
|
asm(".include \"libc/disclaimer.inc\"");
|
|
|
|
static char *strftime_add(char *p, const char *pe, const char *str) {
|
|
while (p < pe && (*p = *str++) != '\0') ++p;
|
|
return p;
|
|
}
|
|
|
|
static char *strftime_conv(char *p, const char *pe, int n, const char *format) {
|
|
char buf[INT_STRLEN_MAXIMUM(int) + 1];
|
|
(snprintf)(buf, sizeof(buf), format, n);
|
|
return strftime_add(p, pe, buf);
|
|
}
|
|
|
|
static char *strftime_secs(char *p, const char *pe, const struct tm *t) {
|
|
static char buf[INT_STRLEN_MAXIMUM(int) + 1];
|
|
struct tm tmp;
|
|
int64_t s;
|
|
tmp = *t; /* Make a copy, mktime(3) modifies the tm struct. */
|
|
s = mktime(&tmp);
|
|
(snprintf)(buf, sizeof(buf), "%ld", s);
|
|
return strftime_add(p, pe, buf);
|
|
}
|
|
|
|
static char *strftime_timefmt(char *p, const char *pe, const char *format,
|
|
const struct tm *t) {
|
|
int i;
|
|
long diff;
|
|
char const *sign;
|
|
/* size_t z1, z2, z3; */
|
|
for (; *format; ++format) {
|
|
if (*format == '%') {
|
|
label:
|
|
switch (*++format) {
|
|
case '\0':
|
|
--format;
|
|
break;
|
|
case 'A':
|
|
p = strftime_add(p, pe,
|
|
(t->tm_wday < 0 || t->tm_wday > 6)
|
|
? "?"
|
|
: kWeekdayName[t->tm_wday]);
|
|
continue;
|
|
case 'a':
|
|
p = strftime_add(p, pe,
|
|
(t->tm_wday < 0 || t->tm_wday > 6)
|
|
? "?"
|
|
: kWeekdayNameShort[t->tm_wday]);
|
|
continue;
|
|
case 'B':
|
|
p = strftime_add(
|
|
p, pe,
|
|
(t->tm_mon < 0 || t->tm_mon > 11) ? "?" : kMonthName[t->tm_mon]);
|
|
continue;
|
|
case 'b':
|
|
case 'h':
|
|
p = strftime_add(p, pe,
|
|
(t->tm_mon < 0 || t->tm_mon > 11)
|
|
? "?"
|
|
: kMonthNameShort[t->tm_mon]);
|
|
continue;
|
|
case 'c':
|
|
p = strftime_timefmt(p, pe, "%D %X", t);
|
|
continue;
|
|
case 'C':
|
|
/*
|
|
** %C used to do a...
|
|
** strftime_timefmt("%a %b %e %X %Y", t);
|
|
** ...whereas now POSIX 1003.2 calls for
|
|
** something completely different.
|
|
** (ado, 5/24/93)
|
|
*/
|
|
p = strftime_conv(p, pe, div100int64(t->tm_year + TM_YEAR_BASE),
|
|
"%02d");
|
|
continue;
|
|
case 'D':
|
|
p = strftime_timefmt(p, pe, "%m/%d/%y", t);
|
|
continue;
|
|
case 'x':
|
|
/*
|
|
** Version 3.0 of strftime from Arnold Robbins
|
|
** (arnold@skeeve.atl.ga.us) does the
|
|
** equivalent of...
|
|
** strftime_timefmt("%a %b %e %Y");
|
|
** ...for %x; since the X3J11 C language
|
|
** standard calls for "date, using locale's
|
|
** date format," anything goes. Using just
|
|
** numbers (as here) makes Quakers happier.
|
|
** Word from Paul Eggert (eggert@twinsun.com)
|
|
** is that %Y-%m-%d is the ISO standard date
|
|
** format, specified in ISO 2014 and later
|
|
** ISO 8601:1988, with a summary available in
|
|
** pub/doc/ISO/english/ISO8601.ps.Z on
|
|
** ftp.uni-erlangen.de.
|
|
** (ado, 5/30/93)
|
|
*/
|
|
p = strftime_timefmt(p, pe, "%m/%d/%y", t);
|
|
continue;
|
|
case 'd':
|
|
p = strftime_conv(p, pe, t->tm_mday, "%02d");
|
|
continue;
|
|
case 'E':
|
|
case 'O':
|
|
/*
|
|
** POSIX locale extensions, a la
|
|
** Arnold Robbins' strftime version 3.0.
|
|
** The sequences
|
|
** %Ec %EC %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)
|
|
*/
|
|
goto label;
|
|
case 'e':
|
|
p = strftime_conv(p, pe, t->tm_mday, "%2d");
|
|
continue;
|
|
case 'H':
|
|
p = strftime_conv(p, pe, t->tm_hour, "%02d");
|
|
continue;
|
|
case 'I':
|
|
p = strftime_conv(p, pe, (t->tm_hour % 12) ? (t->tm_hour % 12) : 12,
|
|
"%02d");
|
|
continue;
|
|
case 'j':
|
|
p = strftime_conv(p, pe, t->tm_yday + 1, "%03d");
|
|
continue;
|
|
case 'k':
|
|
/*
|
|
** This used to be...
|
|
** strftime_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)
|
|
*/
|
|
p = strftime_conv(p, pe, t->tm_hour, "%2d");
|
|
continue;
|
|
#ifdef KITCHEN_SINK
|
|
case 'K':
|
|
/*
|
|
** After all this time, still unclaimed!
|
|
*/
|
|
p = strftime_add(p, pe, "kitchen sink");
|
|
continue;
|
|
#endif /* defined KITCHEN_SINK */
|
|
case 'l':
|
|
/*
|
|
** This used to be...
|
|
** strftime_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)
|
|
*/
|
|
p = strftime_conv(p, pe, (t->tm_hour % 12) ? (t->tm_hour % 12) : 12,
|
|
"%2d");
|
|
continue;
|
|
case 'M':
|
|
p = strftime_conv(p, pe, t->tm_min, "%02d");
|
|
continue;
|
|
case 'm':
|
|
p = strftime_conv(p, pe, t->tm_mon + 1, "%02d");
|
|
continue;
|
|
case 'n':
|
|
p = strftime_add(p, pe, "\n");
|
|
continue;
|
|
case 'p':
|
|
p = strftime_add(p, pe, t->tm_hour >= 12 ? "PM" : "AM");
|
|
continue;
|
|
case 'R':
|
|
p = strftime_timefmt(p, pe, "%H:%M", t);
|
|
continue;
|
|
case 'r':
|
|
p = strftime_timefmt(p, pe, "%I:%M:%S %p", t);
|
|
continue;
|
|
case 'S':
|
|
p = strftime_conv(p, pe, t->tm_sec, "%02d");
|
|
continue;
|
|
case 's':
|
|
p = strftime_secs(p, pe, t);
|
|
continue;
|
|
case 'T':
|
|
case 'X':
|
|
p = strftime_timefmt(p, pe, "%H:%M:%S", t);
|
|
continue;
|
|
case 't':
|
|
p = strftime_add(p, pe, "\t");
|
|
continue;
|
|
case 'U':
|
|
p = strftime_conv(p, pe, (t->tm_yday + 7 - t->tm_wday) / 7, "%02d");
|
|
continue;
|
|
case 'u':
|
|
/*
|
|
** From Arnold Robbins' strftime version 3.0:
|
|
** "ISO 8601: Weekday as a decimal number
|
|
** [1 (Monday) - 7]"
|
|
** (ado, 5/24/93)
|
|
*/
|
|
p = strftime_conv(p, pe, (t->tm_wday == 0) ? 7 : t->tm_wday, "%d");
|
|
continue;
|
|
case 'V':
|
|
/*
|
|
** 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). The method for
|
|
** determining the week number is as specified
|
|
** by ISO 8601 (to wit: if the week 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 1)."
|
|
** (ado, 5/24/93)
|
|
*/
|
|
/*
|
|
** XXX--If January 1 falls on a Friday,
|
|
** January 1-3 are part of week 53 of the
|
|
** previous year. By analogy, if January
|
|
** 1 falls on a Thursday, are December 29-31
|
|
** of the PREVIOUS year part of week 1???
|
|
** (ado 5/24/93)
|
|
**
|
|
** You are understood not to expect this.
|
|
*/
|
|
i = (t->tm_yday + 10 - (t->tm_wday ? (t->tm_wday - 1) : 6)) / 7;
|
|
if (i == 0) {
|
|
/*
|
|
** What day of the week does
|
|
** January 1 fall on?
|
|
*/
|
|
i = t->tm_wday - (t->tm_yday - 1);
|
|
/*
|
|
** Fri Jan 1: 53
|
|
** Sun Jan 1: 52
|
|
** Sat Jan 1: 53 if previous
|
|
** year a leap
|
|
** year, else 52
|
|
*/
|
|
if (i == TM_FRIDAY)
|
|
i = 53;
|
|
else if (i == TM_SUNDAY)
|
|
i = 52;
|
|
else
|
|
i = isleap(t->tm_year + TM_YEAR_BASE) ? 53 : 52;
|
|
#ifdef XPG4_1994_04_09
|
|
/*
|
|
** As of 4/9/94, though,
|
|
** XPG4 calls for 53
|
|
** unconditionally.
|
|
*/
|
|
i = 53;
|
|
#endif /* defined XPG4_1994_04_09 */
|
|
}
|
|
p = strftime_conv(p, pe, i, "%02d");
|
|
continue;
|
|
case 'v':
|
|
/*
|
|
** From Arnold Robbins' strftime version 3.0:
|
|
** "date as dd-bbb-YYYY"
|
|
** (ado, 5/24/93)
|
|
*/
|
|
p = strftime_timefmt(p, pe, "%e-%b-%Y", t);
|
|
continue;
|
|
case 'W':
|
|
p = strftime_conv(
|
|
p, pe, (t->tm_yday + 7 - (t->tm_wday ? (t->tm_wday - 1) : 6)) / 7,
|
|
"%02d");
|
|
continue;
|
|
case 'w':
|
|
p = strftime_conv(p, pe, t->tm_wday, "%d");
|
|
continue;
|
|
case 'y':
|
|
p = strftime_conv(p, pe, (t->tm_year + TM_YEAR_BASE) % 100, "%02d");
|
|
continue;
|
|
case 'Y':
|
|
p = strftime_conv(p, pe, t->tm_year + TM_YEAR_BASE, "%04d");
|
|
continue;
|
|
case 'Z':
|
|
if (t->tm_zone) {
|
|
p = strftime_add(p, pe, t->tm_zone);
|
|
} else {
|
|
if (t->tm_isdst == 0 || t->tm_isdst == 1) {
|
|
p = strftime_add(p, pe, tzname[t->tm_isdst]);
|
|
} else {
|
|
p = strftime_add(p, pe, "?");
|
|
}
|
|
}
|
|
continue;
|
|
case 'z':
|
|
if (t->tm_isdst < 0) continue;
|
|
#ifdef TM_GMTOFF
|
|
diff = t->TM_GMTOFF;
|
|
#else /* !defined TM_GMTOFF */
|
|
if (t->tm_isdst == 0)
|
|
#ifdef USG_COMPAT
|
|
diff = -timezone;
|
|
#else /* !defined USG_COMPAT */
|
|
continue;
|
|
#endif /* !defined USG_COMPAT */
|
|
else
|
|
#ifdef ALTZONE
|
|
diff = -altzone;
|
|
#else /* !defined ALTZONE */
|
|
continue;
|
|
#endif /* !defined ALTZONE */
|
|
#endif /* !defined TM_GMTOFF */
|
|
if (diff < 0) {
|
|
sign = "-";
|
|
diff = -diff;
|
|
} else {
|
|
sign = "+";
|
|
}
|
|
p = strftime_add(p, pe, sign);
|
|
diff /= SECSPERMIN;
|
|
diff = (diff / MINSPERHOUR) * 100 + (diff % MINSPERHOUR);
|
|
p = strftime_conv(p, pe, diff, "%04d");
|
|
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 (p >= pe) break;
|
|
*p++ = *format;
|
|
}
|
|
return p;
|
|
}
|
|
|
|
/**
|
|
* Converts time to string, e.g.
|
|
*
|
|
* char b[64];
|
|
* int64_t sec;
|
|
* struct tm tm;
|
|
* time(&sec);
|
|
* localtime_r(&sec, &tm);
|
|
* strftime(b, sizeof(b), "%Y-%m-%dT%H:%M:%S%z", &tm); // ISO8601
|
|
* strftime(b, sizeof(b), "%a, %d %b %Y %H:%M:%S %Z", &tm); // RFC1123
|
|
*
|
|
* @return bytes copied excluding nul, or 0 on error
|
|
*/
|
|
size_t strftime(char *s, size_t size, const char *f, const struct tm *t) {
|
|
char *p;
|
|
assert(t);
|
|
p = strftime_timefmt(s, s + size, f, t);
|
|
if (p < s + size) {
|
|
*p = '\0';
|
|
return p - s;
|
|
} else {
|
|
s[size - 1] = '\0';
|
|
return 0;
|
|
}
|
|
}
|