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-rw-r--r--date.c247
1 files changed, 0 insertions, 247 deletions
diff --git a/date.c b/date.c
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1/* vi: set sw=4 ts=4: */
2/*
3 * Mini date implementation for busybox
4 *
5 * by Matthew Grant <grantma@anathoth.gen.nz>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21*/
22
23#include <stdlib.h>
24#include <errno.h>
25#include <sys/time.h>
26#include <unistd.h>
27#include <time.h>
28#include <stdio.h>
29#include <string.h>
30#include <getopt.h>
31#include "busybox.h"
32
33
34/* This 'date' command supports only 2 time setting formats,
35 all the GNU strftime stuff (its in libc, lets use it),
36 setting time using UTC and displaying int, as well as
37 an RFC 822 complient date output for shell scripting
38 mail commands */
39
40/* Input parsing code is always bulky - used heavy duty libc stuff as
41 much as possible, missed out a lot of bounds checking */
42
43/* Default input handling to save suprising some people */
44
45static struct tm *date_conv_time(struct tm *tm_time, const char *t_string)
46{
47 int nr;
48
49 nr = sscanf(t_string, "%2d%2d%2d%2d%d",
50 &(tm_time->tm_mon),
51 &(tm_time->tm_mday),
52 &(tm_time->tm_hour),
53 &(tm_time->tm_min), &(tm_time->tm_year));
54
55 if (nr < 4 || nr > 5) {
56 error_msg_and_die(invalid_date, t_string);
57 }
58
59 /* correct for century - minor Y2K problem here? */
60 if (tm_time->tm_year >= 1900)
61 tm_time->tm_year -= 1900;
62 /* adjust date */
63 tm_time->tm_mon -= 1;
64
65 return (tm_time);
66
67}
68
69
70/* The new stuff for LRP */
71
72static struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
73{
74 struct tm t;
75
76 /* Parse input and assign appropriately to tm_time */
77
78 if (t=*tm_time,sscanf(t_string, "%d:%d:%d",
79 &t.tm_hour, &t.tm_min, &t.tm_sec) == 3) {
80 /* no adjustments needed */
81
82 } else if (t=*tm_time,sscanf(t_string, "%d:%d",
83 &t.tm_hour, &t.tm_min) == 2) {
84 /* no adjustments needed */
85
86
87 } else if (t=*tm_time,sscanf(t_string, "%d.%d-%d:%d:%d",
88 &t.tm_mon,
89 &t.tm_mday,
90 &t.tm_hour,
91 &t.tm_min, &t.tm_sec) == 5) {
92
93 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
94
95 } else if (t=*tm_time,sscanf(t_string, "%d.%d-%d:%d",
96 &t.tm_mon,
97 &t.tm_mday,
98 &t.tm_hour, &t.tm_min) == 4) {
99
100 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
101
102 } else if (t=*tm_time,sscanf(t_string, "%d.%d.%d-%d:%d:%d",
103 &t.tm_year,
104 &t.tm_mon,
105 &t.tm_mday,
106 &t.tm_hour,
107 &t.tm_min, &t.tm_sec) == 6) {
108
109 t.tm_year -= 1900; /* Adjust years */
110 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
111
112 } else if (t=*tm_time,sscanf(t_string, "%d.%d.%d-%d:%d",
113 &t.tm_year,
114 &t.tm_mon,
115 &t.tm_mday,
116 &t.tm_hour, &t.tm_min) == 5) {
117 t.tm_year -= 1900; /* Adjust years */
118 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
119
120 } else {
121 error_msg_and_die(invalid_date, t_string);
122 }
123 *tm_time = t;
124 return (tm_time);
125}
126
127
128int date_main(int argc, char **argv)
129{
130 char *date_str = NULL;
131 char *date_fmt = NULL;
132 char *t_buff;
133 int c;
134 int set_time = 0;
135 int rfc822 = 0;
136 int utc = 0;
137 int use_arg = 0;
138 time_t tm;
139 struct tm tm_time;
140
141 /* Interpret command line args */
142 while ((c = getopt(argc, argv, "Rs:ud:")) != EOF) {
143 switch (c) {
144 case 'R':
145 rfc822 = 1;
146 break;
147 case 's':
148 set_time = 1;
149 if ((date_str != NULL) || ((date_str = optarg) == NULL)) {
150 show_usage();
151 }
152 break;
153 case 'u':
154 utc = 1;
155 if (putenv("TZ=UTC0") != 0)
156 error_msg_and_die(memory_exhausted);
157 break;
158 case 'd':
159 use_arg = 1;
160 if ((date_str != NULL) || ((date_str = optarg) == NULL))
161 show_usage();
162 break;
163 default:
164 show_usage();
165 }
166 }
167
168 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+'))
169 date_fmt = &argv[optind][1]; /* Skip over the '+' */
170 else if (date_str == NULL) {
171 set_time = 1;
172 date_str = argv[optind];
173 }
174#if 0
175 else {
176 error_msg("date_str='%s' date_fmt='%s'\n", date_str, date_fmt);
177 show_usage();
178 }
179#endif
180
181 /* Now we have parsed all the information except the date format
182 which depends on whether the clock is being set or read */
183
184 time(&tm);
185 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
186 /* Zero out fields - take her back to midnight! */
187 if (date_str != NULL) {
188 tm_time.tm_sec = 0;
189 tm_time.tm_min = 0;
190 tm_time.tm_hour = 0;
191 }
192
193 /* Process any date input to UNIX time since 1 Jan 1970 */
194 if (date_str != NULL) {
195
196 if (strchr(date_str, ':') != NULL) {
197 date_conv_ftime(&tm_time, date_str);
198 } else {
199 date_conv_time(&tm_time, date_str);
200 }
201
202 /* Correct any day of week and day of year etc. fields */
203 tm = mktime(&tm_time);
204 if (tm < 0)
205 error_msg_and_die(invalid_date, date_str);
206 if ( utc ) {
207 if (putenv("TZ=UTC0") != 0)
208 error_msg_and_die(memory_exhausted);
209 }
210
211 /* if setting time, set it */
212 if (set_time) {
213 if (stime(&tm) < 0) {
214 perror_msg("cannot set date");
215 }
216 }
217 }
218
219 /* Display output */
220
221 /* Deal with format string */
222 if (date_fmt == NULL) {
223 date_fmt = (rfc822
224 ? (utc
225 ? "%a, %_d %b %Y %H:%M:%S GMT"
226 : "%a, %_d %b %Y %H:%M:%S %z")
227 : "%a %b %e %H:%M:%S %Z %Y");
228
229 } else if (*date_fmt == '\0') {
230 /* Imitate what GNU 'date' does with NO format string! */
231 printf("\n");
232 return EXIT_SUCCESS;
233 }
234
235 /* Handle special conversions */
236
237 if (strncmp(date_fmt, "%f", 2) == 0) {
238 date_fmt = "%Y.%m.%d-%H:%M:%S";
239 }
240
241 /* Print OUTPUT (after ALL that!) */
242 t_buff = xmalloc(201);
243 strftime(t_buff, 200, date_fmt, &tm_time);
244 puts(t_buff);
245
246 return EXIT_SUCCESS;
247}
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