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 Fischer 9 * 10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 11*/ 12 13#include "libbb.h" 14 15/* This 'date' command supports only 2 time setting formats, 16 all the GNU strftime stuff (its in libc, lets use it), 17 setting time using UTC and displaying it, as well as 18 an RFC 2822 compliant date output for shell scripting 19 mail commands */ 20 21/* Input parsing code is always bulky - used heavy duty libc stuff as 22 much as possible, missed out a lot of bounds checking */ 23 24/* Default input handling to save surprising some people */ 25 26 27#define DATE_OPT_RFC2822 0x01 28#define DATE_OPT_SET 0x02 29#define DATE_OPT_UTC 0x04 30#define DATE_OPT_DATE 0x08 31#define DATE_OPT_REFERENCE 0x10 32#define DATE_OPT_TIMESPEC 0x20 33#define DATE_OPT_HINT 0x40 34 35static void maybe_set_utc(int opt) 36{ 37 if (opt & DATE_OPT_UTC) 38 putenv((char*)"TZ=UTC0"); 39} 40 41int date_main(int argc, char **argv); 42int date_main(int argc, char **argv) 43{ 44 time_t tm; 45 struct tm tm_time; 46 unsigned opt; 47 int ifmt = -1; 48 char *date_str = NULL; 49 char *date_fmt = NULL; 50 char *filename = NULL; 51 char *isofmt_arg; 52 char *hintfmt_arg; 53 54 opt_complementary = "d--s:s--d" 55 USE_FEATURE_DATE_ISOFMT(":R--I:I--R"); 56 opt = getopt32(argv, "Rs:ud:r:" 57 USE_FEATURE_DATE_ISOFMT("I::D:"), 58 &date_str, &date_str, &filename 59 USE_FEATURE_DATE_ISOFMT(, &isofmt_arg, &hintfmt_arg)); 60 maybe_set_utc(opt); 61 62 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_TIMESPEC)) { 63 if (!isofmt_arg) { 64 ifmt = 0; /* default is date */ 65 } else { 66 static const char *const isoformats[] = { 67 "date", "hours", "minutes", "seconds" 68 }; 69 70 for (ifmt = 0; ifmt < 4; ifmt++) 71 if (!strcmp(isofmt_arg, isoformats[ifmt])) 72 goto found; 73 /* parse error */ 74 bb_show_usage(); 75 found: ; 76 } 77 } 78 79 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) { 80 date_fmt = &argv[optind][1]; /* Skip over the '+' */ 81 } else if (date_str == NULL) { 82 opt |= DATE_OPT_SET; 83 date_str = argv[optind]; 84 } 85 86 /* Now we have parsed all the information except the date format 87 which depends on whether the clock is being set or read */ 88 89 if (filename) { 90 struct stat statbuf; 91 xstat(filename, &statbuf); 92 tm = statbuf.st_mtime; 93 } else 94 time(&tm); 95 memcpy(&tm_time, localtime(&tm), sizeof(tm_time)); 96 /* Zero out fields - take her back to midnight! */ 97 if (date_str != NULL) { 98 tm_time.tm_sec = 0; 99 tm_time.tm_min = 0; 100 tm_time.tm_hour = 0; 101 102 /* Process any date input to UNIX time since 1 Jan 1970 */ 103 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) { 104 strptime(date_str, hintfmt_arg, &tm_time); 105 } else if (strchr(date_str, ':') != NULL) { 106 /* Parse input and assign appropriately to tm_time */ 107 108 if (sscanf(date_str, "%d:%d:%d", &tm_time.tm_hour, &tm_time.tm_min, 109 &tm_time.tm_sec) == 3) { 110 /* no adjustments needed */ 111 } else if (sscanf(date_str, "%d:%d", &tm_time.tm_hour, 112 &tm_time.tm_min) == 2) { 113 /* no adjustments needed */ 114 } else if (sscanf(date_str, "%d.%d-%d:%d:%d", &tm_time.tm_mon, 115 &tm_time.tm_mday, &tm_time.tm_hour, 116 &tm_time.tm_min, &tm_time.tm_sec) == 5) { 117 /* Adjust dates from 1-12 to 0-11 */ 118 tm_time.tm_mon -= 1; 119 } else if (sscanf(date_str, "%d.%d-%d:%d", &tm_time.tm_mon, 120 &tm_time.tm_mday, 121 &tm_time.tm_hour, &tm_time.tm_min) == 4) { 122 /* Adjust dates from 1-12 to 0-11 */ 123 tm_time.tm_mon -= 1; 124 } else if (sscanf(date_str, "%d.%d.%d-%d:%d:%d", &tm_time.tm_year, 125 &tm_time.tm_mon, &tm_time.tm_mday, 126 &tm_time.tm_hour, &tm_time.tm_min, 127 &tm_time.tm_sec) == 6) { 128 tm_time.tm_year -= 1900; /* Adjust years */ 129 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */ 130 } else if (sscanf(date_str, "%d.%d.%d-%d:%d", &tm_time.tm_year, 131 &tm_time.tm_mon, &tm_time.tm_mday, 132 &tm_time.tm_hour, &tm_time.tm_min) == 5) { 133 tm_time.tm_year -= 1900; /* Adjust years */ 134 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */ 135 } else { 136 bb_error_msg_and_die(bb_msg_invalid_date, date_str); 137 } 138 } else { 139 int nr; 140 char *cp; 141 142 nr = sscanf(date_str, "%2d%2d%2d%2d%d", &tm_time.tm_mon, 143 &tm_time.tm_mday, &tm_time.tm_hour, &tm_time.tm_min, 144 &tm_time.tm_year); 145 146 if (nr < 4 || nr > 5) { 147 bb_error_msg_and_die(bb_msg_invalid_date, date_str); 148 } 149 150 cp = strchr(date_str, '.'); 151 if (cp) { 152 nr = sscanf(cp + 1, "%2d", &tm_time.tm_sec); 153 if (nr != 1) { 154 bb_error_msg_and_die(bb_msg_invalid_date, date_str); 155 } 156 } 157 158 /* correct for century - minor Y2K problem here? */ 159 if (tm_time.tm_year >= 1900) { 160 tm_time.tm_year -= 1900; 161 } 162 /* adjust date */ 163 tm_time.tm_mon -= 1; 164 } 165 166 /* Correct any day of week and day of year etc. fields */ 167 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */ 168 tm = mktime(&tm_time); 169 if (tm < 0) { 170 bb_error_msg_and_die(bb_msg_invalid_date, date_str); 171 } 172 maybe_set_utc(opt); 173 174 /* if setting time, set it */ 175 if ((opt & DATE_OPT_SET) && stime(&tm) < 0) { 176 bb_perror_msg("cannot set date"); 177 } 178 } 179 180 /* Display output */ 181 182 /* Deal with format string */ 183 184 if (date_fmt == NULL) { 185 int i; 186 date_fmt = xzalloc(32); 187 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) { 188 strcpy(date_fmt, "%Y-%m-%d"); 189 if (ifmt > 0) { 190 i = 8; 191 date_fmt[i++] = 'T'; 192 date_fmt[i++] = '%'; 193 date_fmt[i++] = 'H'; 194 if (ifmt > 1) { 195 date_fmt[i++] = ':'; 196 date_fmt[i++] = '%'; 197 date_fmt[i++] = 'M'; 198 } 199 if (ifmt > 2) { 200 date_fmt[i++] = ':'; 201 date_fmt[i++] = '%'; 202 date_fmt[i++] = 'S'; 203 } 204 format_utc: 205 date_fmt[i++] = '%'; 206 date_fmt[i] = (opt & DATE_OPT_UTC) ? 'Z' : 'z'; 207 } 208 } else if (opt & DATE_OPT_RFC2822) { 209 /* Undo busybox.c for date -R */ 210 if (ENABLE_LOCALE_SUPPORT) 211 setlocale(LC_TIME, "C"); 212 strcpy(date_fmt, "%a, %d %b %Y %H:%M:%S "); 213 i = 22; 214 goto format_utc; 215 } else /* default case */ 216 date_fmt = (char*)"%a %b %e %H:%M:%S %Z %Y"; 217 } 218 219#define date_buf bb_common_bufsiz1 220 if (*date_fmt == '\0') { 221 /* With no format string, just print a blank line */ 222 date_buf[0] = '\0'; 223 } else { 224 /* Handle special conversions */ 225 226 if (strncmp(date_fmt, "%f", 2) == 0) { 227 date_fmt = (char*)"%Y.%m.%d-%H:%M:%S"; 228 } 229 230 /* Generate output string */ 231 strftime(date_buf, sizeof(date_buf), date_fmt, &tm_time); 232 } 233 puts(date_buf); 234 235 return EXIT_SUCCESS; 236} 237