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