busybox/coreutils/date.c
Bernhard Reutner-Fischer 73561cc75a - pull from busybox_scratch: r15829:15850
Various fixes, cleanups and shrinkage:
saves 952 Bytes:
   text    data     bss     dec     hex filename
1087742   15853  790632 1894227  1ce753 ../busybox/busybox.old
1086790   15853  790632 1893275  1ce39b busybox
via:
# scripts/bloat-o-meter ../busybox/busybox_unstripped.old busybox_unstripped 
function                                             old     new   delta
ipcrm_main                                           756     822     +66
getval                                                 -      61     +61
maybe_set_utc                                          -      40     +40
udhcpc_main                                         2896    2912     +16
md5_hash_block                                       428     437      +9
opt                                                    8      16      +8
qgravechar                                           106     110      +4
make_bitmap                                          292     295      +3
inflate_unzip                                       2056    2059      +3
add_partition                                       1412    1414      +2
__parsespent                                         156     158      +2
qrealloc                                              41      42      +1
format                                                 -       1      +1
catv_main                                            313     314      +1
watch_main                                           293     292      -1
varunset                                              81      80      -1
part                                                   1       -      -1
check_if_skip                                        837     836      -1
start_stop_daemon_main                               840     837      -3
create_lost_and_found                                175     172      -3
supress_non_delimited_lines                            4       -      -4
static.l                                               4       -      -4
static.c                                               5       1      -4
bsd_sum_file                                         237     233      -4
eval2                                                338     332      -6
arithmetic_common                                    166     158      -8
cmpfunc                                               22       5     -17
cksum_main                                           294     275     -19
cmp_main                                             465     439     -26
dd_main                                             1535    1508     -27
rmmod_main                                           376     333     -43
cut_file                                             727     644     -83
ipcs_main                                           3809    3721     -88
cut_main                                             722     614    -108
date_main                                           1443    1263    -180
remove_ids                                           222       -    -222
------------------------------------------------------------------------------
(add/remove: 3/4 grow/shrink: 11/18 up/down: 217/-853)       Total: -636 bytes
2006-08-28 23:31:54 +00:00

232 lines
6.3 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini date implementation for busybox
*
* by Matthew Grant <grantma@anathoth.gen.nz>
*
* iso-format handling added by Robert Griebl <griebl@gmx.de>
* bugfixes and cleanup by Bernhard Fischer
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
/* This 'date' command supports only 2 time setting formats,
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
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 */
#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
static void maybe_set_utc(int opt)
{
if ((opt & DATE_OPT_UTC) && putenv("TZ=UTC0") != 0)
bb_error_msg_and_die(bb_msg_memory_exhausted);
}
int date_main(int argc, char **argv)
{
time_t tm;
struct tm tm_time;
unsigned long opt;
int ifmt = -1;
char *date_str = NULL;
char *date_fmt = NULL;
char *filename = NULL;
char *isofmt_arg;
char *hintfmt_arg;
bb_opt_complementally = "?:d--s:s--d"
USE_FEATURE_DATE_ISOFMT(":R--I:I--R");
opt = bb_getopt_ulflags(argc, argv, "Rs:ud:r:"
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 {
const char * const isoformats[] =
{"date", "hours", "minutes", "seconds"};
for (ifmt = 0; ifmt < 4; ifmt++)
if (!strcmp(isofmt_arg, isoformats[ifmt])) {
break;
}
if (ifmt == 4) /* parse error */
bb_show_usage();
}
}
/* XXX, date_fmt == NULL from this always */
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);
if (tm < 0) {
bb_error_msg_and_die(bb_msg_invalid_date, date_str);
}
maybe_set_utc(opt);
/* if setting time, set it */
if ((opt & DATE_OPT_SET) && stime(&tm) < 0) {
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) {
strcpy(date_fmt, "%a, %d %b %Y %H:%M:%S ");
i = 22;
goto format_utc;
} else /* default case */
date_fmt = "%a %b %e %H:%M:%S %Z %Y";
}
if (*date_fmt == '\0') {
/* With no format string, just print a blank line */
*bb_common_bufsiz1 = 0;
} else {
/* Handle special conversions */
if (strncmp(date_fmt, "%f", 2) == 0) {
date_fmt = "%Y.%m.%d-%H:%M:%S";
}
/* Generate output string */
strftime(bb_common_bufsiz1, 200, date_fmt, &tm_time);
}
puts(bb_common_bufsiz1);
return EXIT_SUCCESS;
}