Contents of /trunk/mkinitrd-magellan/busybox/coreutils/date.c
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Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
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Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 6906 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
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 | #include "libbb.h" |
55 | |
56 | enum { |
57 | OPT_RFC2822 = (1 << 0), /* R */ |
58 | OPT_SET = (1 << 1), /* s */ |
59 | OPT_UTC = (1 << 2), /* u */ |
60 | OPT_DATE = (1 << 3), /* d */ |
61 | OPT_REFERENCE = (1 << 4), /* r */ |
62 | OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */ |
63 | OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */ |
64 | }; |
65 | |
66 | static void maybe_set_utc(int opt) |
67 | { |
68 | if (opt & OPT_UTC) |
69 | putenv((char*)"TZ=UTC0"); |
70 | } |
71 | |
72 | #if ENABLE_LONG_OPTS |
73 | static const char date_longopts[] ALIGN1 = |
74 | "rfc-822\0" No_argument "R" |
75 | "rfc-2822\0" No_argument "R" |
76 | "set\0" Required_argument "s" |
77 | "utc\0" No_argument "u" |
78 | /* "universal\0" No_argument "u" */ |
79 | "date\0" Required_argument "d" |
80 | "reference\0" Required_argument "r" |
81 | ; |
82 | #endif |
83 | |
84 | int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
85 | int date_main(int argc UNUSED_PARAM, char **argv) |
86 | { |
87 | struct tm tm_time; |
88 | char buf_fmt_dt2str[64]; |
89 | time_t tm; |
90 | unsigned opt; |
91 | int ifmt = -1; |
92 | char *date_str; |
93 | char *fmt_dt2str; |
94 | char *fmt_str2dt; |
95 | char *filename; |
96 | char *isofmt_arg = NULL; |
97 | |
98 | opt_complementary = "d--s:s--d" |
99 | IF_FEATURE_DATE_ISOFMT(":R--I:I--R"); |
100 | IF_LONG_OPTS(applet_long_options = date_longopts;) |
101 | opt = getopt32(argv, "Rs:ud:r:" |
102 | IF_FEATURE_DATE_ISOFMT("I::D:"), |
103 | &date_str, &date_str, &filename |
104 | IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt)); |
105 | argv += optind; |
106 | maybe_set_utc(opt); |
107 | |
108 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) { |
109 | ifmt = 0; /* default is date */ |
110 | if (isofmt_arg) { |
111 | static const char isoformats[] ALIGN1 = |
112 | "date\0""hours\0""minutes\0""seconds\0"; /* ns? */ |
113 | ifmt = index_in_substrings(isoformats, isofmt_arg); |
114 | if (ifmt < 0) |
115 | bb_show_usage(); |
116 | } |
117 | } |
118 | |
119 | fmt_dt2str = NULL; |
120 | if (argv[0] && argv[0][0] == '+') { |
121 | fmt_dt2str = &argv[0][1]; /* skip over the '+' */ |
122 | argv++; |
123 | } |
124 | if (!(opt & (OPT_SET | OPT_DATE))) { |
125 | opt |= OPT_SET; |
126 | date_str = argv[0]; /* can be NULL */ |
127 | if (date_str) { |
128 | #if ENABLE_FEATURE_DATE_COMPAT |
129 | int len = strspn(date_str, "0123456789"); |
130 | if (date_str[len] == '\0' |
131 | || (date_str[len] == '.' |
132 | && isdigit(date_str[len+1]) |
133 | && isdigit(date_str[len+2]) |
134 | && date_str[len+3] == '\0' |
135 | ) |
136 | ) { |
137 | /* Dreaded MMDDhhmm[[CC]YY][.ss] format! |
138 | * It does not match -d or -s format. |
139 | * Some users actually do use it. |
140 | */ |
141 | len -= 8; |
142 | if (len < 0 || len > 4 || (len & 1)) |
143 | bb_error_msg_and_die(bb_msg_invalid_date, date_str); |
144 | if (len != 0) { /* move YY or CCYY to front */ |
145 | char buf[4]; |
146 | memcpy(buf, date_str + 8, len); |
147 | memmove(date_str + len, date_str, 8); |
148 | memcpy(date_str, buf, len); |
149 | } |
150 | } |
151 | #endif |
152 | argv++; |
153 | } |
154 | } |
155 | if (*argv) |
156 | bb_show_usage(); |
157 | |
158 | /* Now we have parsed all the information except the date format |
159 | * which depends on whether the clock is being set or read */ |
160 | |
161 | if (opt & OPT_REFERENCE) { |
162 | struct stat statbuf; |
163 | xstat(filename, &statbuf); |
164 | tm = statbuf.st_mtime; |
165 | } else { |
166 | time(&tm); |
167 | } |
168 | localtime_r(&tm, &tm_time); |
169 | |
170 | /* If date string is given, update tm_time, and maybe set date */ |
171 | if (date_str != NULL) { |
172 | /* Zero out fields - take her back to midnight! */ |
173 | tm_time.tm_sec = 0; |
174 | tm_time.tm_min = 0; |
175 | tm_time.tm_hour = 0; |
176 | |
177 | /* Process any date input to UNIX time since 1 Jan 1970 */ |
178 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) { |
179 | if (strptime(date_str, fmt_str2dt, &tm_time) == NULL) |
180 | bb_error_msg_and_die(bb_msg_invalid_date, date_str); |
181 | } else { |
182 | parse_datestr(date_str, &tm_time); |
183 | } |
184 | |
185 | /* Correct any day of week and day of year etc. fields */ |
186 | tm_time.tm_isdst = -1; /* Be sure to recheck dst */ |
187 | tm = validate_tm_time(date_str, &tm_time); |
188 | |
189 | maybe_set_utc(opt); |
190 | |
191 | /* if setting time, set it */ |
192 | if ((opt & OPT_SET) && stime(&tm) < 0) { |
193 | bb_perror_msg("can't set date"); |
194 | } |
195 | } |
196 | |
197 | /* Display output */ |
198 | |
199 | /* Deal with format string */ |
200 | if (fmt_dt2str == NULL) { |
201 | int i; |
202 | fmt_dt2str = buf_fmt_dt2str; |
203 | if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) { |
204 | /* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */ |
205 | strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S"); |
206 | i = 8 + 3 * ifmt; |
207 | if (ifmt != 0) { |
208 | /* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */ |
209 | format_utc: |
210 | fmt_dt2str[i++] = '%'; |
211 | fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z'; |
212 | } |
213 | fmt_dt2str[i] = '\0'; |
214 | } else if (opt & OPT_RFC2822) { |
215 | /* -R. undo busybox.c setlocale */ |
216 | if (ENABLE_LOCALE_SUPPORT) |
217 | setlocale(LC_TIME, "C"); |
218 | strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S "); |
219 | i = sizeof("%a, %d %b %Y %H:%M:%S ")-1; |
220 | goto format_utc; |
221 | } else { /* default case */ |
222 | fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y"; |
223 | } |
224 | } |
225 | |
226 | #define date_buf bb_common_bufsiz1 |
227 | if (*fmt_dt2str == '\0') { |
228 | /* With no format string, just print a blank line */ |
229 | date_buf[0] = '\0'; |
230 | } else { |
231 | /* Handle special conversions */ |
232 | if (strncmp(fmt_dt2str, "%f", 2) == 0) { |
233 | fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S"; |
234 | } |
235 | /* Generate output string */ |
236 | strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time); |
237 | } |
238 | puts(date_buf); |
239 | |
240 | return EXIT_SUCCESS; |
241 | } |