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/*
* datetime.c - parameter and command interface to date and time utilities
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 2002 Peter Stephenson, Clint Adams
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Peter Stephenson, Clint Adams or the Zsh Development Group
* be liable to any party for direct, indirect, special, incidental, or
* consequential damages arising out of the use of this software and its
* documentation, even if Peter Stephenson, Clint Adams and the Zsh
* Development Group have been advised of the possibility of such damage.
*
* Peter Stephenson, Clint Adams and the Zsh Development Group specifically
* disclaim any warranties, including, but not limited to, the implied
* warranties of merchantability and fitness for a particular purpose.
* The software provided hereunder is on an "as is" basis, and Peter
* Stephenson, Clint Adams and the Zsh Development Group have no obligation
* to provide maintenance, support, updates, enhancements, or modifications.
*
*/
#include "datetime.mdh"
#include "datetime.pro"
#include <time.h>
#ifndef HAVE_MKTIME
#ifdef HAVE_TIMELOCAL
#define mktime(x) timelocal(x)
#define HAVE_MKTIME 1
#endif
#endif
static int
reverse_strftime(char *nam, char **argv, char *scalar, int quiet)
{
#if defined(HAVE_STRPTIME) && defined(HAVE_MKTIME)
struct tm tm;
zlong mytime;
char *endp;
/*
* Initialise all parameters to zero; there's no floating point
* so memset() will do the trick. The exception is that tm_isdst
* is set to -1 which, if not overridden, will cause mktime()
* to use the current timezone. This is probably the best guess;
* it's the one that will cause dates and times output by strftime
* without the -r option and without an explicit timezone to be
* converted back correctly.
*/
(void)memset(&tm, 0, sizeof(tm));
tm.tm_isdst = -1;
endp = strptime(argv[1], argv[0], &tm);
if (!endp) {
/* Conversion failed completely. */
if (!quiet)
zwarnnam(nam, "format not matched");
return 1;
}
mytime = (zlong)mktime(&tm);
if (scalar)
setiparam(scalar, mytime);
else {
char buf[DIGBUFSIZE];
convbase(buf, mytime, 10);
printf("%s\n", buf);
}
if (*endp && !quiet) {
/*
* Not everything in the input string was converted.
* This is probably benign, since the format has been satisfied,
* but issue a warning unless the quiet flag is set.
*/
zwarnnam(nam, "warning: input string not completely matched");
}
return 0;
#else
if (!quiet)
zwarnnam(nam, "not implemented on this system");
return 2;
#endif
}
static int
bin_strftime(char *nam, char **argv, Options ops, UNUSED(int func))
{
int bufsize, x;
char *endptr = NULL, *scalar = NULL, *buffer;
time_t secs;
struct tm *t;
if (OPT_ISSET(ops,'s')) {
scalar = OPT_ARG(ops, 's');
if (!isident(scalar)) {
zwarnnam(nam, "not an identifier: %s", scalar);
return 1;
}
}
if (OPT_ISSET(ops, 'r'))
return reverse_strftime(nam, argv, scalar, OPT_ISSET(ops, 'q'));
secs = (time_t)strtoul(argv[1], &endptr, 10);
if (secs == (time_t)ULONG_MAX) {
zwarnnam(nam, "%s: %e", argv[1], errno);
return 1;
} else if (*endptr != '\0') {
zwarnnam(nam, "%s: invalid decimal number", argv[1]);
return 1;
}
t = localtime(&secs);
if (!t) {
zwarnnam(nam, "%s: unable to convert to time", argv[1]);
return 1;
}
bufsize = strlen(argv[0]) * 8;
buffer = zalloc(bufsize);
for (x=0; x < 4; x++) {
if (ztrftime(buffer, bufsize, argv[0], t) >= 0)
break;
buffer = zrealloc(buffer, bufsize *= 2);
}
if (scalar) {
setsparam(scalar, metafy(buffer, -1, META_DUP));
} else {
printf("%s\n", buffer);
}
zfree(buffer, bufsize);
return 0;
}
static zlong
getcurrentsecs()
{
return (zlong) time(NULL);
}
static struct builtin bintab[] = {
BUILTIN("strftime", 0, bin_strftime, 2, 2, 0, "qrs:", NULL),
};
static const struct gsu_integer epochseconds_gsu =
{ getcurrentsecs, NULL, stdunsetfn };
static struct paramdef patab[] = {
SPECIALPMDEF("EPOCHSECONDS", PM_INTEGER|PM_READONLY,
&epochseconds_gsu, NULL, NULL),
};
static struct features module_features = {
bintab, sizeof(bintab)/sizeof(*bintab),
NULL, 0,
NULL, 0,
patab, sizeof(patab)/sizeof(*patab),
0
};
/**/
int
setup_(UNUSED(Module m))
{
return 0;
}
/**/
int
features_(Module m, char ***features)
{
*features = featuresarray(m, &module_features);
return 0;
}
/**/
int
enables_(Module m, int **enables)
{
return handlefeatures(m, &module_features, enables);
}
/**/
int
boot_(Module m)
{
return 0;
}
/**/
int
cleanup_(Module m)
{
return setfeatureenables(m, &module_features, NULL);
}
/**/
int
finish_(UNUSED(Module m))
{
return 0;
}
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