| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini date implementation for busybox
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| 4 | *
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| 5 | * by Matthew Grant <grantma@anathoth.gen.nz>
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| 6 | *
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| 7 | * iso-format handling added by Robert Griebl <griebl@gmx.de>
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| 8 | *
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| 9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 10 | */
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| 11 |
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| 12 | #include <stdlib.h>
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| 13 | #include <errno.h>
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| 14 | #include <unistd.h>
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| 15 | #include <time.h>
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| 16 | #include <stdio.h>
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| 17 | #include <string.h>
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| 18 | #include "busybox.h"
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| 19 |
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| 20 | /* This 'date' command supports only 2 time setting formats,
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| 21 | all the GNU strftime stuff (its in libc, lets use it),
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| 22 | setting time using UTC and displaying int, as well as
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| 23 | an RFC 822 complient date output for shell scripting
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| 24 | mail commands */
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| 25 |
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| 26 | /* Input parsing code is always bulky - used heavy duty libc stuff as
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| 27 | much as possible, missed out a lot of bounds checking */
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| 28 |
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| 29 | /* Default input handling to save surprising some people */
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| 30 |
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| 31 | static struct tm *date_conv_time(struct tm *tm_time, const char *t_string)
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| 32 | {
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| 33 | int nr;
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| 34 | char *cp;
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| 35 |
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| 36 | nr = sscanf(t_string, "%2d%2d%2d%2d%d", &(tm_time->tm_mon),
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| 37 | &(tm_time->tm_mday), &(tm_time->tm_hour), &(tm_time->tm_min),
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| 38 | &(tm_time->tm_year));
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| 39 |
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| 40 | if (nr < 4 || nr > 5) {
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| 41 | bb_error_msg_and_die(bb_msg_invalid_date, t_string);
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| 42 | }
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| 43 |
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| 44 | cp = strchr(t_string, '.');
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| 45 | if (cp) {
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| 46 | nr = sscanf(cp + 1, "%2d", &(tm_time->tm_sec));
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| 47 | if (nr != 1) {
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| 48 | bb_error_msg_and_die(bb_msg_invalid_date, t_string);
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| 49 | }
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| 50 | }
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| 51 |
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| 52 | /* correct for century - minor Y2K problem here? */
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| 53 | if (tm_time->tm_year >= 1900) {
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| 54 | tm_time->tm_year -= 1900;
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| 55 | }
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| 56 | /* adjust date */
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| 57 | tm_time->tm_mon -= 1;
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| 58 |
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| 59 | return (tm_time);
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| 60 |
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| 61 | }
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| 62 |
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| 63 |
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| 64 | /* The new stuff for LRP */
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| 65 |
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| 66 | static struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
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| 67 | {
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| 68 | struct tm t;
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| 69 |
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| 70 | /* Parse input and assign appropriately to tm_time */
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| 71 |
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| 72 | if (t = *tm_time, sscanf(t_string, "%d:%d:%d", &t.tm_hour, &t.tm_min,
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| 73 | &t.tm_sec) == 3) {
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| 74 | /* no adjustments needed */
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| 75 | } else if (t = *tm_time, sscanf(t_string, "%d:%d", &t.tm_hour,
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| 76 | &t.tm_min) == 2) {
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| 77 | /* no adjustments needed */
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| 78 | } else if (t = *tm_time, sscanf(t_string, "%d.%d-%d:%d:%d", &t.tm_mon,
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| 79 | &t.tm_mday, &t.tm_hour,
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| 80 | &t.tm_min, &t.tm_sec) == 5) {
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| 81 | /* Adjust dates from 1-12 to 0-11 */
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| 82 | t.tm_mon -= 1;
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| 83 | } else if (t = *tm_time, sscanf(t_string, "%d.%d-%d:%d", &t.tm_mon,
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| 84 | &t.tm_mday,
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| 85 | &t.tm_hour, &t.tm_min) == 4) {
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| 86 | /* Adjust dates from 1-12 to 0-11 */
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| 87 | t.tm_mon -= 1;
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| 88 | } else if (t = *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d:%d", &t.tm_year,
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| 89 | &t.tm_mon, &t.tm_mday,
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| 90 | &t.tm_hour, &t.tm_min,
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| 91 | &t.tm_sec) == 6) {
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| 92 | t.tm_year -= 1900; /* Adjust years */
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| 93 | t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
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| 94 | } else if (t = *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d", &t.tm_year,
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| 95 | &t.tm_mon, &t.tm_mday,
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| 96 | &t.tm_hour, &t.tm_min) == 5) {
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| 97 | t.tm_year -= 1900; /* Adjust years */
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| 98 | t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
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| 99 | } else {
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| 100 | bb_error_msg_and_die(bb_msg_invalid_date, t_string);
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| 101 | }
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| 102 | *tm_time = t;
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| 103 | return (tm_time);
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| 104 | }
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| 105 |
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| 106 | #define DATE_OPT_RFC2822 0x01
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| 107 | #define DATE_OPT_SET 0x02
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| 108 | #define DATE_OPT_UTC 0x04
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| 109 | #define DATE_OPT_DATE 0x08
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| 110 | #define DATE_OPT_REFERENCE 0x10
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| 111 | #define DATE_OPT_TIMESPEC 0x20
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| 112 | #define DATE_OPT_HINT 0x40
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| 113 |
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| 114 | int date_main(int argc, char **argv)
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| 115 | {
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| 116 | char *date_str = NULL;
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| 117 | char *date_fmt = NULL;
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| 118 | int set_time;
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| 119 | int utc;
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| 120 | time_t tm;
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| 121 | unsigned long opt;
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| 122 | struct tm tm_time;
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| 123 | char *filename = NULL;
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| 124 |
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| 125 | int ifmt = 0;
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| 126 | char *isofmt_arg;
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| 127 | char *hintfmt_arg;
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| 128 |
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| 129 | bb_opt_complementally = "?:d--s:s--d";
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| 130 | opt = bb_getopt_ulflags(argc, argv, "Rs:ud:r:"
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| 131 | USE_FEATURE_DATE_ISOFMT("I::D:"),
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| 132 | &date_str, &date_str, &filename
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| 133 | USE_FEATURE_DATE_ISOFMT(, &isofmt_arg, &hintfmt_arg));
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| 134 | set_time = opt & DATE_OPT_SET;
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| 135 | utc = opt & DATE_OPT_UTC;
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| 136 | if (utc && putenv("TZ=UTC0") != 0) {
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| 137 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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| 138 | }
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| 139 |
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| 140 | if(ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_TIMESPEC)) {
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| 141 | if (!isofmt_arg) {
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| 142 | ifmt = 1;
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| 143 | } else {
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| 144 | char *isoformats[]={"date","hours","minutes","seconds"};
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| 145 | for(ifmt = 4; ifmt;)
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| 146 | if(!strcmp(isofmt_arg,isoformats[--ifmt]))
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| 147 | break;
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| 148 | }
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| 149 | if (!ifmt) {
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| 150 | bb_show_usage();
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| 151 | }
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| 152 | }
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| 153 |
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| 154 | /* XXX, date_fmt == NULL from this always */
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| 155 | if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
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| 156 | date_fmt = &argv[optind][1]; /* Skip over the '+' */
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| 157 | } else if (date_str == NULL) {
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| 158 | set_time = 1;
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| 159 | date_str = argv[optind];
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| 160 | }
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| 161 |
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| 162 | /* Now we have parsed all the information except the date format
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| 163 | which depends on whether the clock is being set or read */
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| 164 |
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| 165 | if(filename) {
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| 166 | struct stat statbuf;
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| 167 | xstat(filename,&statbuf);
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| 168 | tm=statbuf.st_mtime;
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| 169 | } else time(&tm);
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| 170 | memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
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| 171 | /* Zero out fields - take her back to midnight! */
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| 172 | if (date_str != NULL) {
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| 173 | tm_time.tm_sec = 0;
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| 174 | tm_time.tm_min = 0;
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| 175 | tm_time.tm_hour = 0;
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| 176 |
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| 177 | /* Process any date input to UNIX time since 1 Jan 1970 */
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| 178 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) {
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| 179 | strptime(date_str, hintfmt_arg, &tm_time);
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| 180 | } else if (strchr(date_str, ':') != NULL) {
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| 181 | date_conv_ftime(&tm_time, date_str);
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| 182 | } else {
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| 183 | date_conv_time(&tm_time, date_str);
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| 184 | }
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| 185 |
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| 186 | /* Correct any day of week and day of year etc. fields */
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| 187 | tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
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| 188 | tm = mktime(&tm_time);
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| 189 | if (tm < 0) {
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| 190 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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| 191 | }
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| 192 | if (utc && putenv("TZ=UTC0") != 0) {
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| 193 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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| 194 | }
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| 195 |
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| 196 | /* if setting time, set it */
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| 197 | if (set_time && stime(&tm) < 0) {
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| 198 | bb_perror_msg("cannot set date");
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| 199 | }
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| 200 | }
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| 201 |
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| 202 | /* Display output */
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| 203 |
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| 204 | /* Deal with format string */
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| 205 | if (date_fmt == NULL) {
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| 206 | /* Start with the default case */
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| 207 |
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| 208 | date_fmt = (opt & DATE_OPT_RFC2822 ?
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| 209 | (utc ? "%a, %d %b %Y %H:%M:%S GMT" :
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| 210 | "%a, %d %b %Y %H:%M:%S %z") :
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| 211 | "%a %b %e %H:%M:%S %Z %Y");
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| 212 |
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| 213 | if (ENABLE_FEATURE_DATE_ISOFMT) {
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| 214 | if (ifmt == 4)
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| 215 | date_fmt = utc ? "%Y-%m-%dT%H:%M:%SZ" : "%Y-%m-%dT%H:%M:%S%z";
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| 216 | else if (ifmt == 3)
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| 217 | date_fmt = utc ? "%Y-%m-%dT%H:%MZ" : "%Y-%m-%dT%H:%M%z";
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| 218 | else if (ifmt == 2)
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| 219 | date_fmt = utc ? "%Y-%m-%dT%HZ" : "%Y-%m-%dT%H%z";
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| 220 | else if (ifmt == 1)
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| 221 | date_fmt = "%Y-%m-%d";
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| 222 | }
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| 223 | }
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| 224 |
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| 225 | if (*date_fmt == '\0') {
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| 226 |
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| 227 | /* With no format string, just print a blank line */
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| 228 |
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| 229 | *bb_common_bufsiz1=0;
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| 230 | } else {
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| 231 |
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| 232 | /* Handle special conversions */
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| 233 |
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| 234 | if (strncmp(date_fmt, "%f", 2) == 0) {
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| 235 | date_fmt = "%Y.%m.%d-%H:%M:%S";
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| 236 | }
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| 237 |
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| 238 | /* Generate output string */
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| 239 | strftime(bb_common_bufsiz1, 200, date_fmt, &tm_time);
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| 240 | }
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| 241 | puts(bb_common_bufsiz1);
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| 242 |
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| 243 | return EXIT_SUCCESS;
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| 244 | }
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