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/*
* Copyright (c) 1985, 1987, 1988 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 "private.h"
#include "locale.h"
/*
** The two things date knows about time are. . .
*/
#ifndef TM_YEAR_BASE
#define TM_YEAR_BASE 1900
#endif /* !defined TM_YEAR_BASE */
#ifndef SECSPERMIN
#define SECSPERMIN 60
#endif /* !defined SECSPERMIN */
extern char ** environ;
extern char * optarg;
extern int optind;
extern char * tzname[2];
static int retval = EXIT_SUCCESS;
static void display(const char *, time_t);
static void dogmt(void);
static void errensure(void);
static void timeout(FILE *, const char *, const struct tm *);
static void usage(void);
int
main(const int argc, char *argv[])
{
register const char * format;
register const char * cp;
register int ch;
register bool rflag = false;
time_t t;
intmax_t secs;
char * endarg;
#ifdef LC_ALL
setlocale(LC_ALL, "");
#endif /* defined(LC_ALL) */
#if HAVE_GETTEXT
#ifdef TZ_DOMAINDIR
bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
#endif /* defined(TEXTDOMAINDIR) */
textdomain(TZ_DOMAIN);
#endif /* HAVE_GETTEXT */
t = time(NULL);
format = NULL;
while ((ch = getopt(argc, argv, "ucr:")) != EOF && ch != -1) {
switch (ch) {
default:
usage();
case 'u': /* do it in UT */
case 'c':
dogmt();
break;
case 'r': /* seconds since 1970 */
if (rflag) {
fprintf(stderr,
_("date: error: multiple -r's used"));
usage();
}
rflag = true;
errno = 0;
secs = strtoimax (optarg, &endarg, 0);
if (*endarg || optarg == endarg)
errno = EINVAL;
else if (! (time_t_min <= secs && secs <= time_t_max))
errno = ERANGE;
if (errno) {
perror(optarg);
errensure();
exit(retval);
}
t = secs;
break;
}
}
while (optind < argc) {
cp = argv[optind++];
if (*cp == '+')
if (format == NULL)
format = cp + 1;
else {
fprintf(stderr,
_("date: error: multiple formats in command line\n"));
usage();
}
else {
fprintf(stderr, _("date: unknown operand: %s\n"), cp);
usage();
}
}
display(format, t);
return retval;
}
static void
dogmt(void)
{
static char ** fakeenv;
if (fakeenv == NULL) {
register int from;
register int to;
register int n;
static char tzegmt0[] = "TZ=GMT0";
for (n = 0; environ[n] != NULL; ++n)
continue;
fakeenv = malloc((n + 2) * sizeof *fakeenv);
if (fakeenv == NULL) {
perror(_("Memory exhausted"));
errensure();
exit(retval);
}
to = 0;
fakeenv[to++] = tzegmt0;
for (from = 1; environ[from] != NULL; ++from)
if (strncmp(environ[from], "TZ=", 3) != 0)
fakeenv[to++] = environ[from];
fakeenv[to] = NULL;
environ = fakeenv;
}
}
static void
errensure(void)
{
if (retval == EXIT_SUCCESS)
retval = EXIT_FAILURE;
}
static void
usage(void)
{
fprintf(stderr,
_("date: usage: date [-u] [-c] [-r seconds]"
" [+format]\n"));
errensure();
exit(retval);
}
static void
display(char const *format, time_t now)
{
struct tm *tmp;
tmp = localtime(&now);
if (!tmp) {
fprintf(stderr,
_("date: error: time out of range\n"));
errensure();
return;
}
timeout(stdout, format ? format : "%+", tmp);
putchar('\n');
fflush(stdout);
fflush(stderr);
if (ferror(stdout) || ferror(stderr)) {
fprintf(stderr,
_("date: error: couldn't write results\n"));
errensure();
}
}
#define INCR 1024
static void
timeout(FILE *fp, char const *format, struct tm const *tmp)
{
char * cp;
size_t result;
size_t size;
struct tm tm;
if (*format == '\0')
return;
if (!tmp) {
fprintf(stderr, _("date: error: time out of range\n"));
errensure();
return;
}
tm = *tmp;
tmp = &tm;
size = INCR;
cp = malloc(size);
for ( ; ; ) {
if (cp == NULL) {
fprintf(stderr,
_("date: error: can't get memory\n"));
errensure();
exit(retval);
}
cp[0] = '\1';
result = strftime(cp, size, format, tmp);
if (result != 0 || cp[0] == '\0')
break;
size += INCR;
cp = realloc(cp, size);
}
fwrite(cp, 1, result, fp);
free(cp);
}
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