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busybox/coreutils/date.c
Eric Andersen 8876fb2f59 last_patch89 from vodz: 
Manuel,

    I rewrite bb_getopt_ulflags() function for more universal usage.
    My version support now:
    - options with arguments (optional arg as GNU extension also)
    - complementaly and/or incomplementaly and/or incongruously and/or list
    options
    - long_opt (all applets may have long option, add supporting is trivial)
    This realisation full compatibile from your version.
    Code size grow 480 bytes, but only coreutils/* over compensate this size
    after using new function. Last patch reduced over 800 bytes and not full
    applied to all. "mkdir" and "mv" applets have long_opt now for demonstrate
    trivial addition support long_opt with usage new bb_getopt_ulflags().
    Complementaly and/or incomplementaly and/or incongruously and/or list options
    logic is not trivial, but new "cut" and "grep" applets using this logic
    for examples with full demostrating. New "grep" applet reduced over 300
    bytes.

    Mark,
    Also. I removed bug from "grep" applet.
    $ echo a b | busybox grep -e a b
    a b
    a b
    But right is printing one only.

    --w
    vodz
2003-06-20 09:01:58 +00:00

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/* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdlib.h>
#include <errno.h>
#include <sys/time.h>
#include <unistd.h>
#include <time.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#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 int, as well as
an RFC 822 complient 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 suprising some people */
static struct tm *date_conv_time(struct tm *tm_time, const char *t_string)
{
int nr;
nr = sscanf(t_string, "%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, t_string);
}
/* 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;
return (tm_time);
}
/* The new stuff for LRP */
static struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
{
struct tm t;
/* Parse input and assign appropriately to tm_time */
if (t =
*tm_time, sscanf(t_string, "%d:%d:%d", &t.tm_hour, &t.tm_min,
&t.tm_sec) == 3) {
/* no adjustments needed */
} else if (t =
*tm_time, sscanf(t_string, "%d:%d", &t.tm_hour,
&t.tm_min) == 2) {
/* no adjustments needed */
} else if (t =
*tm_time, sscanf(t_string, "%d.%d-%d:%d:%d", &t.tm_mon,
&t.tm_mday, &t.tm_hour, &t.tm_min,
&t.tm_sec) == 5) {
/* Adjust dates from 1-12 to 0-11 */
t.tm_mon -= 1;
} else if (t =
*tm_time, sscanf(t_string, "%d.%d-%d:%d", &t.tm_mon,
&t.tm_mday, &t.tm_hour, &t.tm_min) == 4) {
/* Adjust dates from 1-12 to 0-11 */
t.tm_mon -= 1;
} else if (t =
*tm_time, sscanf(t_string, "%d.%d.%d-%d:%d:%d", &t.tm_year,
&t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min,
&t.tm_sec) == 6) {
t.tm_year -= 1900; /* Adjust years */
t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
} else if (t =
*tm_time, sscanf(t_string, "%d.%d.%d-%d:%d", &t.tm_year,
&t.tm_mon, &t.tm_mday, &t.tm_hour,
&t.tm_min) == 5) {
t.tm_year -= 1900; /* Adjust years */
t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
} else {
bb_error_msg_and_die(bb_msg_invalid_date, t_string);
}
*tm_time = t;
return (tm_time);
}
int date_main(int argc, char **argv)
{
char *date_str = NULL;
char *date_fmt = NULL;
char *t_buff;
int set_time;
int rfc822;
int utc;
int use_arg = 0;
time_t tm;
unsigned long opt;
struct tm tm_time;
#ifdef CONFIG_FEATURE_DATE_ISOFMT
int ifmt = 0;
char *isofmt_arg;
# define GETOPT_ISOFMT "I::"
#else
# define GETOPT_ISOFMT
#endif
bb_opt_complementaly = "d~ds:s~ds";
opt = bb_getopt_ulflags(argc, argv, "Rs:ud:" GETOPT_ISOFMT,
&date_str, &date_str
#ifdef CONFIG_FEATURE_DATE_ISOFMT
, &isofmt_arg
#endif
);
rfc822 = opt & 1;
set_time = opt & 2;
utc = opt & 4;
if(utc) {
if (putenv("TZ=UTC0") != 0)
bb_error_msg_and_die(bb_msg_memory_exhausted);
}
use_arg = opt & 8;
if(opt & 0x80000000UL)
bb_show_usage();
#ifdef CONFIG_FEATURE_DATE_ISOFMT
if(opt & 16) {
if (!isofmt_arg)
ifmt = 1;
else {
int ifmt_len = bb_strlen(isofmt_arg);
if ((ifmt_len <= 4)
&& (strncmp(isofmt_arg, "date", ifmt_len) == 0)) {
ifmt = 1;
} else if ((ifmt_len <= 5)
&& (strncmp(isofmt_arg, "hours", ifmt_len) == 0)) {
ifmt = 2;
} else if ((ifmt_len <= 7)
&& (strncmp(isofmt_arg, "minutes", ifmt_len) == 0)) {
ifmt = 3;
} else if ((ifmt_len <= 7)
&& (strncmp(isofmt_arg, "seconds", ifmt_len) == 0)) {
ifmt = 4;
}
}
if (!ifmt) {
bb_show_usage();
}
}
#endif
if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
date_fmt = &argv[optind][1]; /* Skip over the '+' */
} else if (date_str == NULL) {
set_time = 1;
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 */
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 (date_str != NULL) {
if (strchr(date_str, ':') != NULL) {
date_conv_ftime(&tm_time, date_str);
} else {
date_conv_time(&tm_time, date_str);
}
/* Correct any day of week and day of year etc. fields */
tm = mktime(&tm_time);
if (tm < 0) {
bb_error_msg_and_die(bb_msg_invalid_date, date_str);
}
if (utc && (putenv("TZ=UTC0") != 0)) {
bb_error_msg_and_die(bb_msg_memory_exhausted);
}
/* if setting time, set it */
if (set_time && (stime(&tm) < 0)) {
bb_perror_msg("cannot set date");
}
}
/* Display output */
/* Deal with format string */
if (date_fmt == NULL) {
#ifdef CONFIG_FEATURE_DATE_ISOFMT
switch (ifmt) {
case 4:
date_fmt = utc ? "%Y-%m-%dT%H:%M:%SZ" : "%Y-%m-%dT%H:%M:%S%z";
break;
case 3:
date_fmt = utc ? "%Y-%m-%dT%H:%MZ" : "%Y-%m-%dT%H:%M%z";
break;
case 2:
date_fmt = utc ? "%Y-%m-%dT%HZ" : "%Y-%m-%dT%H%z";
break;
case 1:
date_fmt = "%Y-%m-%d";
break;
case 0:
default:
#endif
date_fmt =
(rfc822
? (utc ? "%a, %e %b %Y %H:%M:%S GMT" :
"%a, %e %b %Y %H:%M:%S %z") : "%a %b %e %H:%M:%S %Z %Y");
#ifdef CONFIG_FEATURE_DATE_ISOFMT
break;
}
#endif
} else if (*date_fmt == '\0') {
/* Imitate what GNU 'date' does with NO format string! */
printf("\n");
return EXIT_SUCCESS;
}
/* Handle special conversions */
if (strncmp(date_fmt, "%f", 2) == 0) {
date_fmt = "%Y.%m.%d-%H:%M:%S";
}
/* Print OUTPUT (after ALL that!) */
t_buff = xmalloc(201);
strftime(t_buff, 200, date_fmt, &tm_time);
puts(t_buff);
return EXIT_SUCCESS;
}
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