busybox/coreutils/date.c

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/* vi: set sw=4 ts=4: */
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/*
* Mini date implementation for busybox
*
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* by Matthew Grant <grantma@anathoth.gen.nz>
*
* iso-format handling added by Robert Griebl <griebl@gmx.de>
* bugfixes and cleanup by Bernhard Fischer
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*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
#include "libbb.h"
/* This 'date' command supports only 2 time setting formats,
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all the GNU strftime stuff (its in libc, lets use it),
setting time using UTC and displaying it, as well as
an RFC 2822 compliant date output for shell scripting
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mail commands */
/* Input parsing code is always bulky - used heavy duty libc stuff as
much as possible, missed out a lot of bounds checking */
/* Default input handling to save surprising some people */
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#define DATE_OPT_RFC2822 0x01
#define DATE_OPT_SET 0x02
#define DATE_OPT_UTC 0x04
#define DATE_OPT_DATE 0x08
#define DATE_OPT_REFERENCE 0x10
#define DATE_OPT_TIMESPEC 0x20
#define DATE_OPT_HINT 0x40
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static void maybe_set_utc(int opt)
{
if (opt & DATE_OPT_UTC)
putenv((char*)"TZ=UTC0");
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}
int date_main(int argc, char **argv);
int date_main(int argc, char **argv)
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{
time_t tm;
struct tm tm_time;
unsigned opt;
int ifmt = -1;
char *date_str = NULL;
char *date_fmt = NULL;
char *filename = NULL;
char *isofmt_arg;
char *hintfmt_arg;
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opt_complementary = "?:d--s:s--d"
USE_FEATURE_DATE_ISOFMT(":R--I:I--R");
opt = getopt32(argc, argv, "Rs:ud:r:"
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USE_FEATURE_DATE_ISOFMT("I::D:"),
&date_str, &date_str, &filename
USE_FEATURE_DATE_ISOFMT(, &isofmt_arg, &hintfmt_arg));
maybe_set_utc(opt);
if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_TIMESPEC)) {
if (!isofmt_arg) {
ifmt = 0; /* default is date */
} else {
static const char * const isoformats[] =
{ "date", "hours", "minutes", "seconds" };
for (ifmt = 0; ifmt < 4; ifmt++)
if (!strcmp(isofmt_arg, isoformats[ifmt]))
goto found;
/* parse error */
bb_show_usage();
found: ;
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}
}
/* XXX, date_fmt == NULL from this always */
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if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
date_fmt = &argv[optind][1]; /* Skip over the '+' */
} else if (date_str == NULL) {
opt |= DATE_OPT_SET;
date_str = argv[optind];
}
/* Now we have parsed all the information except the date format
which depends on whether the clock is being set or read */
if (filename) {
struct stat statbuf;
xstat(filename, &statbuf);
tm = statbuf.st_mtime;
} else
time(&tm);
memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
/* Zero out fields - take her back to midnight! */
if (date_str != NULL) {
tm_time.tm_sec = 0;
tm_time.tm_min = 0;
tm_time.tm_hour = 0;
/* Process any date input to UNIX time since 1 Jan 1970 */
if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) {
strptime(date_str, hintfmt_arg, &tm_time);
} else if (strchr(date_str, ':') != NULL) {
/* Parse input and assign appropriately to tm_time */
if (sscanf(date_str, "%d:%d:%d", &tm_time.tm_hour, &tm_time.tm_min,
&tm_time.tm_sec) == 3) {
/* no adjustments needed */
} else if (sscanf(date_str, "%d:%d", &tm_time.tm_hour,
&tm_time.tm_min) == 2) {
/* no adjustments needed */
} else if (sscanf(date_str, "%d.%d-%d:%d:%d", &tm_time.tm_mon,
&tm_time.tm_mday, &tm_time.tm_hour,
&tm_time.tm_min, &tm_time.tm_sec) == 5) {
/* Adjust dates from 1-12 to 0-11 */
tm_time.tm_mon -= 1;
} else if (sscanf(date_str, "%d.%d-%d:%d", &tm_time.tm_mon,
&tm_time.tm_mday,
&tm_time.tm_hour, &tm_time.tm_min) == 4) {
/* Adjust dates from 1-12 to 0-11 */
tm_time.tm_mon -= 1;
} else if (sscanf(date_str, "%d.%d.%d-%d:%d:%d", &tm_time.tm_year,
&tm_time.tm_mon, &tm_time.tm_mday,
&tm_time.tm_hour, &tm_time.tm_min,
&tm_time.tm_sec) == 6) {
tm_time.tm_year -= 1900; /* Adjust years */
tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
} else if (sscanf(date_str, "%d.%d.%d-%d:%d", &tm_time.tm_year,
&tm_time.tm_mon, &tm_time.tm_mday,
&tm_time.tm_hour, &tm_time.tm_min) == 5) {
tm_time.tm_year -= 1900; /* Adjust years */
tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
} else {
bb_error_msg_and_die(bb_msg_invalid_date, date_str);
}
} else {
int nr;
char *cp;
nr = sscanf(date_str, "%2d%2d%2d%2d%d", &tm_time.tm_mon,
&tm_time.tm_mday, &tm_time.tm_hour, &tm_time.tm_min,
&tm_time.tm_year);
if (nr < 4 || nr > 5) {
bb_error_msg_and_die(bb_msg_invalid_date, date_str);
}
cp = strchr(date_str, '.');
if (cp) {
nr = sscanf(cp + 1, "%2d", &tm_time.tm_sec);
if (nr != 1) {
bb_error_msg_and_die(bb_msg_invalid_date, date_str);
}
}
/* correct for century - minor Y2K problem here? */
if (tm_time.tm_year >= 1900) {
tm_time.tm_year -= 1900;
}
/* adjust date */
tm_time.tm_mon -= 1;
}
/* Correct any day of week and day of year etc. fields */
tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
tm = mktime(&tm_time);
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if (tm < 0) {
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bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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}
maybe_set_utc(opt);
/* if setting time, set it */
if ((opt & DATE_OPT_SET) && stime(&tm) < 0) {
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bb_perror_msg("cannot set date");
}
}
/* Display output */
/* Deal with format string */
if (date_fmt == NULL) {
int i;
date_fmt = xzalloc(32);
if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
strcpy(date_fmt, "%Y-%m-%d");
if (ifmt > 0) {
i = 8;
date_fmt[i++] = 'T';
date_fmt[i++] = '%';
date_fmt[i++] = 'H';
if (ifmt > 1) {
date_fmt[i++] = ':';
date_fmt[i++] = '%';
date_fmt[i++] = 'M';
}
if (ifmt > 2) {
date_fmt[i++] = ':';
date_fmt[i++] = '%';
date_fmt[i++] = 'S';
}
format_utc:
date_fmt[i++] = '%';
date_fmt[i] = (opt & DATE_OPT_UTC) ? 'Z' : 'z';
}
} else if (opt & DATE_OPT_RFC2822) {
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/* Undo busybox.c for date -R */
if (ENABLE_LOCALE_SUPPORT)
setlocale(LC_TIME, "C");
strcpy(date_fmt, "%a, %d %b %Y %H:%M:%S ");
i = 22;
goto format_utc;
} else /* default case */
date_fmt = (char*)"%a %b %e %H:%M:%S %Z %Y";
}
#define date_buf bb_common_bufsiz1
if (*date_fmt == '\0') {
/* With no format string, just print a blank line */
date_buf[0] = '\0';
} else {
/* Handle special conversions */
if (strncmp(date_fmt, "%f", 2) == 0) {
date_fmt = (char*)"%Y.%m.%d-%H:%M:%S";
}
/* Generate output string */
strftime(date_buf, sizeof(date_buf), date_fmt, &tm_time);
}
puts(date_buf);
return EXIT_SUCCESS;
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}