Contents of /tags/mkinitrd-6_3_3/busybox/coreutils/date.c
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Wed Dec 15 21:43:57 2010 UTC (13 years, 9 months ago) by niro
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Wed Dec 15 21:43:57 2010 UTC (13 years, 9 months ago) by niro
File MIME type: text/plain
File size: 9554 byte(s)
tagged 'mkinitrd-6_3_3'
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 | * iso-format handling added by Robert Griebl <griebl@gmx.de> |
8 | * bugfixes and cleanup by Bernhard Reutner-Fischer |
9 | * |
10 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
11 | */ |
12 | |
13 | /* This 'date' command supports only 2 time setting formats, |
14 | all the GNU strftime stuff (its in libc, lets use it), |
15 | setting time using UTC and displaying it, as well as |
16 | an RFC 2822 compliant date output for shell scripting |
17 | mail commands */ |
18 | |
19 | /* Input parsing code is always bulky - used heavy duty libc stuff as |
20 | much as possible, missed out a lot of bounds checking */ |
21 | |
22 | /* Default input handling to save surprising some people */ |
23 | |
24 | /* GNU coreutils 6.9 man page: |
25 | * date [OPTION]... [+FORMAT] |
26 | * date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]] |
27 | * -d, --date=STRING |
28 | * display time described by STRING, not `now' |
29 | * -f, --file=DATEFILE |
30 | * like --date once for each line of DATEFILE |
31 | * -r, --reference=FILE |
32 | * display the last modification time of FILE |
33 | * -R, --rfc-2822 |
34 | * output date and time in RFC 2822 format. |
35 | * Example: Mon, 07 Aug 2006 12:34:56 -0600 |
36 | * --rfc-3339=TIMESPEC |
37 | * output date and time in RFC 3339 format. |
38 | * TIMESPEC='date', 'seconds', or 'ns' |
39 | * Date and time components are separated by a single space: |
40 | * 2006-08-07 12:34:56-06:00 |
41 | * -s, --set=STRING |
42 | * set time described by STRING |
43 | * -u, --utc, --universal |
44 | * print or set Coordinated Universal Time |
45 | * |
46 | * Busybox: |
47 | * long options are not supported |
48 | * -f is not supported |
49 | * -I seems to roughly match --rfc-3339, but -I has _optional_ param |
50 | * (thus "-I seconds" doesn't work, only "-Iseconds"), |
51 | * and does not support -Ins |
52 | * -D FMT is a bbox extension for _input_ conversion of -d DATE |
53 | */ |
54 | |
55 | //kbuild:lib-$(CONFIG_DATE) += date.o |
56 | |
57 | //config:config DATE |
58 | //config: bool "date" |
59 | //config: default y |
60 | //config: help |
61 | //config: date is used to set the system date or display the |
62 | //config: current time in the given format. |
63 | //config: |
64 | //config:config FEATURE_DATE_ISOFMT |
65 | //config: bool "Enable ISO date format output (-I)" |
66 | //config: default y |
67 | //config: depends on DATE |
68 | //config: help |
69 | //config: Enable option (-I) to output an ISO-8601 compliant |
70 | //config: date/time string. |
71 | //config: |
72 | //config:config FEATURE_DATE_NANO |
73 | //config: bool "Support %[num]N nanosecond format specifier" |
74 | //config: default n |
75 | //config: depends on DATE |
76 | //config: help |
77 | //config: Support %[num]N format specifier. Adds ~250 bytes of code. |
78 | //config: |
79 | //config:config FEATURE_DATE_COMPAT |
80 | //config: bool "Support weird 'date MMDDhhmm[[YY]YY][.ss]' format" |
81 | //config: default y |
82 | //config: depends on DATE |
83 | //config: help |
84 | //config: System time can be set by 'date -s DATE' and simply 'date DATE', |
85 | //config: but formats of DATE string are different. 'date DATE' accepts |
86 | //config: a rather weird MMDDhhmm[[YY]YY][.ss] format with completely |
87 | //config: unnatural placement of year between minutes and seconds. |
88 | //config: date -s (and other commands like touch -d) use more sensible |
89 | //config: formats (for one, ISO format YYYY-MM-DD hh:mm:ss.ssssss). |
90 | //config: |
91 | //config: With this option off, 'date DATE' is 'date -s DATE' support |
92 | //config: the same format. With it on, 'date DATE' additionally supports |
93 | //config: MMDDhhmm[[YY]YY][.ss] format. |
94 | |
95 | #include "libbb.h" |
96 | #if ENABLE_FEATURE_DATE_NANO |
97 | # include <sys/syscall.h> |
98 | #endif |
99 | |
100 | enum { |
101 | OPT_RFC2822 = (1 << 0), /* R */ |
102 | OPT_SET = (1 << 1), /* s */ |
103 | OPT_UTC = (1 << 2), /* u */ |
104 | OPT_DATE = (1 << 3), /* d */ |
105 | OPT_REFERENCE = (1 << 4), /* r */ |
106 | OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */ |
107 | OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */ |
108 | }; |
109 | |
110 | static void maybe_set_utc(int opt) |
111 | { |
112 | if (opt & OPT_UTC) |
113 | putenv((char*)"TZ=UTC0"); |
114 | } |
115 | |
116 | #if ENABLE_LONG_OPTS |
117 | static const char date_longopts[] ALIGN1 = |
118 | "rfc-822\0" No_argument "R" |
119 | "rfc-2822\0" No_argument "R" |
120 | "set\0" Required_argument "s" |
121 | "utc\0" No_argument "u" |
122 | /* "universal\0" No_argument "u" */ |
123 | "date\0" Required_argument "d" |
124 | "reference\0" Required_argument "r" |
125 | ; |
126 | #endif |
127 | |
128 | int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
129 | int date_main(int argc UNUSED_PARAM, char **argv) |
130 | { |
131 | struct timespec ts; |
132 | struct tm tm_time; |
133 | char buf_fmt_dt2str[64]; |
134 | unsigned opt; |
135 | int ifmt = -1; |
136 | char *date_str; |
137 | char *fmt_dt2str; |
138 | char *fmt_str2dt; |
139 | char *filename; |
140 | char *isofmt_arg = NULL; |
141 | |
142 | opt_complementary = "d--s:s--d" |
143 | IF_FEATURE_DATE_ISOFMT(":R--I:I--R"); |
144 | IF_LONG_OPTS(applet_long_options = date_longopts;) |
145 | opt = getopt32(argv, "Rs:ud:r:" |
146 | IF_FEATURE_DATE_ISOFMT("I::D:"), |
147 | &date_str, &date_str, &filename |
148 | IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt)); |
149 | argv += optind; |
150 | maybe_set_utc(opt); |
151 | |
152 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) { |
153 | ifmt = 0; /* default is date */ |
154 | if (isofmt_arg) { |
155 | static const char isoformats[] ALIGN1 = |
156 | "date\0""hours\0""minutes\0""seconds\0"; /* ns? */ |
157 | ifmt = index_in_substrings(isoformats, isofmt_arg); |
158 | if (ifmt < 0) |
159 | bb_show_usage(); |
160 | } |
161 | } |
162 | |
163 | fmt_dt2str = NULL; |
164 | if (argv[0] && argv[0][0] == '+') { |
165 | fmt_dt2str = &argv[0][1]; /* skip over the '+' */ |
166 | argv++; |
167 | } |
168 | if (!(opt & (OPT_SET | OPT_DATE))) { |
169 | opt |= OPT_SET; |
170 | date_str = argv[0]; /* can be NULL */ |
171 | if (date_str) { |
172 | #if ENABLE_FEATURE_DATE_COMPAT |
173 | int len = strspn(date_str, "0123456789"); |
174 | if (date_str[len] == '\0' |
175 | || (date_str[len] == '.' |
176 | && isdigit(date_str[len+1]) |
177 | && isdigit(date_str[len+2]) |
178 | && date_str[len+3] == '\0' |
179 | ) |
180 | ) { |
181 | /* Dreaded MMDDhhmm[[CC]YY][.ss] format! |
182 | * It does not match -d or -s format. |
183 | * Some users actually do use it. |
184 | */ |
185 | len -= 8; |
186 | if (len < 0 || len > 4 || (len & 1)) |
187 | bb_error_msg_and_die(bb_msg_invalid_date, date_str); |
188 | if (len != 0) { /* move YY or CCYY to front */ |
189 | char buf[4]; |
190 | memcpy(buf, date_str + 8, len); |
191 | memmove(date_str + len, date_str, 8); |
192 | memcpy(date_str, buf, len); |
193 | } |
194 | } |
195 | #endif |
196 | argv++; |
197 | } |
198 | } |
199 | if (*argv) |
200 | bb_show_usage(); |
201 | |
202 | /* Now we have parsed all the information except the date format |
203 | * which depends on whether the clock is being set or read */ |
204 | |
205 | if (opt & OPT_REFERENCE) { |
206 | struct stat statbuf; |
207 | xstat(filename, &statbuf); |
208 | ts.tv_sec = statbuf.st_mtime; |
209 | #if ENABLE_FEATURE_DATE_NANO |
210 | ts.tv_nsec = statbuf.st_mtim.tv_nsec; |
211 | #endif |
212 | } else { |
213 | #if ENABLE_FEATURE_DATE_NANO |
214 | /* libc has incredibly messy way of doing this, |
215 | * typically requiring -lrt. We just skip all this mess */ |
216 | syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts); |
217 | #else |
218 | time(&ts.tv_sec); |
219 | #endif |
220 | } |
221 | localtime_r(&ts.tv_sec, &tm_time); |
222 | |
223 | /* If date string is given, update tm_time, and maybe set date */ |
224 | if (date_str != NULL) { |
225 | /* Zero out fields - take her back to midnight! */ |
226 | tm_time.tm_sec = 0; |
227 | tm_time.tm_min = 0; |
228 | tm_time.tm_hour = 0; |
229 | |
230 | /* Process any date input to UNIX time since 1 Jan 1970 */ |
231 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) { |
232 | if (strptime(date_str, fmt_str2dt, &tm_time) == NULL) |
233 | bb_error_msg_and_die(bb_msg_invalid_date, date_str); |
234 | } else { |
235 | parse_datestr(date_str, &tm_time); |
236 | } |
237 | |
238 | /* Correct any day of week and day of year etc. fields */ |
239 | tm_time.tm_isdst = -1; /* Be sure to recheck dst */ |
240 | ts.tv_sec = validate_tm_time(date_str, &tm_time); |
241 | |
242 | maybe_set_utc(opt); |
243 | |
244 | /* if setting time, set it */ |
245 | if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) { |
246 | bb_perror_msg("can't set date"); |
247 | } |
248 | } |
249 | |
250 | /* Display output */ |
251 | |
252 | /* Deal with format string */ |
253 | if (fmt_dt2str == NULL) { |
254 | int i; |
255 | fmt_dt2str = buf_fmt_dt2str; |
256 | if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) { |
257 | /* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */ |
258 | strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S"); |
259 | i = 8 + 3 * ifmt; |
260 | if (ifmt != 0) { |
261 | /* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */ |
262 | format_utc: |
263 | fmt_dt2str[i++] = '%'; |
264 | fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z'; |
265 | } |
266 | fmt_dt2str[i] = '\0'; |
267 | } else if (opt & OPT_RFC2822) { |
268 | /* -R. undo busybox.c setlocale */ |
269 | if (ENABLE_LOCALE_SUPPORT) |
270 | setlocale(LC_TIME, "C"); |
271 | strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S "); |
272 | i = sizeof("%a, %d %b %Y %H:%M:%S ")-1; |
273 | goto format_utc; |
274 | } else { /* default case */ |
275 | fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y"; |
276 | } |
277 | } |
278 | #if ENABLE_FEATURE_DATE_NANO |
279 | else { |
280 | /* User-specified fmt_dt2str */ |
281 | /* Search for and process "%N" */ |
282 | char *p = fmt_dt2str; |
283 | while ((p = strchr(p, '%')) != NULL) { |
284 | int n, m; |
285 | unsigned pres, scale; |
286 | |
287 | p++; |
288 | if (*p == '%') { |
289 | p++; |
290 | continue; |
291 | } |
292 | n = strspn(p, "0123456789"); |
293 | if (p[n] != 'N') { |
294 | p += n; |
295 | continue; |
296 | } |
297 | /* We have "%[nnn]N" */ |
298 | p[-1] = '\0'; |
299 | p[n] = '\0'; |
300 | scale = 1; |
301 | pres = 9; |
302 | if (n) { |
303 | pres = xatoi_u(p); |
304 | if (pres == 0) |
305 | pres = 9; |
306 | m = 9 - pres; |
307 | while (--m >= 0) |
308 | scale *= 10; |
309 | } |
310 | |
311 | m = p - fmt_dt2str; |
312 | p += n + 1; |
313 | fmt_dt2str = xasprintf("%s%0*u%s", fmt_dt2str, pres, (unsigned)ts.tv_nsec / scale, p); |
314 | p = fmt_dt2str + m; |
315 | } |
316 | } |
317 | #endif |
318 | |
319 | #define date_buf bb_common_bufsiz1 |
320 | if (*fmt_dt2str == '\0') { |
321 | /* With no format string, just print a blank line */ |
322 | date_buf[0] = '\0'; |
323 | } else { |
324 | /* Handle special conversions */ |
325 | if (strncmp(fmt_dt2str, "%f", 2) == 0) { |
326 | fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S"; |
327 | } |
328 | /* Generate output string */ |
329 | strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time); |
330 | } |
331 | puts(date_buf); |
332 | |
333 | return EXIT_SUCCESS; |
334 | } |