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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