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 Reutner-Fischer
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9 | *
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10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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11 | */
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12 |
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13 | /* This 'date' command supports only 2 time setting formats,
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14 | all the GNU strftime stuff (its in libc, lets use it),
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15 | setting time using UTC and displaying it, as well as
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16 | an RFC 2822 compliant date output for shell scripting
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17 | mail commands */
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18 |
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19 | /* Input parsing code is always bulky - used heavy duty libc stuff as
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20 | much as possible, missed out a lot of bounds checking */
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21 |
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22 | //applet:IF_DATE(APPLET(date, _BB_DIR_BIN, _BB_SUID_DROP))
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23 |
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24 | //kbuild:lib-$(CONFIG_DATE) += date.o
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25 |
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26 | //config:config DATE
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27 | //config: bool "date"
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28 | //config: default y
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29 | //config: help
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30 | //config: date is used to set the system date or display the
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31 | //config: current time in the given format.
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32 | //config:
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33 | //config:config FEATURE_DATE_ISOFMT
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34 | //config: bool "Enable ISO date format output (-I)"
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35 | //config: default y
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36 | //config: depends on DATE
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37 | //config: help
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38 | //config: Enable option (-I) to output an ISO-8601 compliant
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39 | //config: date/time string.
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40 | //config:
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41 | //config:# defaults to "no": stat's nanosecond field is a bit non-portable
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42 | //config:config FEATURE_DATE_NANO
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43 | //config: bool "Support %[num]N nanosecond format specifier"
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44 | //config: default n
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45 | //config: depends on DATE && PLATFORM_LINUX # syscall(__NR_clock_gettime)
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46 | //config: help
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47 | //config: Support %[num]N format specifier. Adds ~250 bytes of code.
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48 | //config:
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49 | //config:config FEATURE_DATE_COMPAT
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50 | //config: bool "Support weird 'date MMDDhhmm[[YY]YY][.ss]' format"
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51 | //config: default y
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52 | //config: depends on DATE
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53 | //config: help
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54 | //config: System time can be set by 'date -s DATE' and simply 'date DATE',
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55 | //config: but formats of DATE string are different. 'date DATE' accepts
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56 | //config: a rather weird MMDDhhmm[[YY]YY][.ss] format with completely
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57 | //config: unnatural placement of year between minutes and seconds.
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58 | //config: date -s (and other commands like touch -d) use more sensible
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59 | //config: formats (for one, ISO format YYYY-MM-DD hh:mm:ss.ssssss).
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60 | //config:
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61 | //config: With this option off, 'date DATE' is 'date -s DATE' support
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62 | //config: the same format. With it on, 'date DATE' additionally supports
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63 | //config: MMDDhhmm[[YY]YY][.ss] format.
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64 |
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65 | /* GNU coreutils 6.9 man page:
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66 | * date [OPTION]... [+FORMAT]
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67 | * date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
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68 | * -d, --date=STRING
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69 | * display time described by STRING, not `now'
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70 | * -f, --file=DATEFILE
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71 | * like --date once for each line of DATEFILE
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72 | * -r, --reference=FILE
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73 | * display the last modification time of FILE
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74 | * -R, --rfc-2822
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75 | * output date and time in RFC 2822 format.
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76 | * Example: Mon, 07 Aug 2006 12:34:56 -0600
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77 | * --rfc-3339=TIMESPEC
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78 | * output date and time in RFC 3339 format.
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79 | * TIMESPEC='date', 'seconds', or 'ns'
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80 | * Date and time components are separated by a single space:
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81 | * 2006-08-07 12:34:56-06:00
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82 | * -s, --set=STRING
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83 | * set time described by STRING
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84 | * -u, --utc, --universal
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85 | * print or set Coordinated Universal Time
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86 | *
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87 | * Busybox:
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88 | * long options are not supported
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89 | * -f is not supported
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90 | * -I seems to roughly match --rfc-3339, but -I has _optional_ param
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91 | * (thus "-I seconds" doesn't work, only "-Iseconds"),
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92 | * and does not support -Ins
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93 | * -D FMT is a bbox extension for _input_ conversion of -d DATE
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94 | */
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95 |
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96 | //usage:#define date_trivial_usage
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97 | //usage: "[OPTIONS] [+FMT] [TIME]"
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98 | //usage:#define date_full_usage "\n\n"
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99 | //usage: "Display time (using +FMT), or set time\n"
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100 | //usage: "\nOptions:"
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101 | //usage: IF_NOT_LONG_OPTS(
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102 | //usage: "\n [-s] TIME Set time to TIME"
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103 | //usage: "\n -u Work in UTC (don't convert to local time)"
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104 | //usage: "\n -R Output RFC-2822 compliant date string"
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105 | //usage: ) IF_LONG_OPTS(
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106 | //usage: "\n [-s,--set] TIME Set time to TIME"
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107 | //usage: "\n -u,--utc Work in UTC (don't convert to local time)"
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108 | //usage: "\n -R,--rfc-2822 Output RFC-2822 compliant date string"
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109 | //usage: )
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110 | //usage: IF_FEATURE_DATE_ISOFMT(
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111 | //usage: "\n -I[SPEC] Output ISO-8601 compliant date string"
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112 | //usage: "\n SPEC='date' (default) for date only,"
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113 | //usage: "\n 'hours', 'minutes', or 'seconds' for date and"
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114 | //usage: "\n time to the indicated precision"
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115 | //usage: )
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116 | //usage: IF_NOT_LONG_OPTS(
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117 | //usage: "\n -r FILE Display last modification time of FILE"
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118 | //usage: "\n -d TIME Display TIME, not 'now'"
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119 | //usage: ) IF_LONG_OPTS(
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120 | //usage: "\n -r,--reference FILE Display last modification time of FILE"
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121 | //usage: "\n -d,--date TIME Display TIME, not 'now'"
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122 | //usage: )
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123 | //usage: IF_FEATURE_DATE_ISOFMT(
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124 | //usage: "\n -D FMT Use FMT for -d TIME conversion"
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125 | //usage: )
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126 | //usage: "\n"
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127 | //usage: "\nRecognized TIME formats:"
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128 | //usage: "\n hh:mm[:ss]"
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129 | //usage: "\n [YYYY.]MM.DD-hh:mm[:ss]"
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130 | //usage: "\n YYYY-MM-DD hh:mm[:ss]"
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131 | //usage: "\n [[[[[YY]YY]MM]DD]hh]mm[.ss]"
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132 | //usage:
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133 | //usage:#define date_example_usage
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134 | //usage: "$ date\n"
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135 | //usage: "Wed Apr 12 18:52:41 MDT 2000\n"
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136 |
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137 | #include "libbb.h"
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138 | #if ENABLE_FEATURE_DATE_NANO
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139 | # include <sys/syscall.h>
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140 | #endif
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141 |
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142 | enum {
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143 | OPT_RFC2822 = (1 << 0), /* R */
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144 | OPT_SET = (1 << 1), /* s */
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145 | OPT_UTC = (1 << 2), /* u */
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146 | OPT_DATE = (1 << 3), /* d */
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147 | OPT_REFERENCE = (1 << 4), /* r */
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148 | OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */
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149 | OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */
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150 | };
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151 |
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152 | static void maybe_set_utc(int opt)
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153 | {
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154 | if (opt & OPT_UTC)
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155 | putenv((char*)"TZ=UTC0");
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156 | }
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157 |
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158 | #if ENABLE_LONG_OPTS
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159 | static const char date_longopts[] ALIGN1 =
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160 | "rfc-822\0" No_argument "R"
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161 | "rfc-2822\0" No_argument "R"
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162 | "set\0" Required_argument "s"
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163 | "utc\0" No_argument "u"
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164 | /* "universal\0" No_argument "u" */
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165 | "date\0" Required_argument "d"
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166 | "reference\0" Required_argument "r"
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167 | ;
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168 | #endif
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169 |
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170 | int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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171 | int date_main(int argc UNUSED_PARAM, char **argv)
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172 | {
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173 | struct timespec ts;
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174 | struct tm tm_time;
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175 | char buf_fmt_dt2str[64];
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176 | unsigned opt;
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177 | int ifmt = -1;
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178 | char *date_str;
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179 | char *fmt_dt2str;
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180 | char *fmt_str2dt;
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181 | char *filename;
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182 | char *isofmt_arg = NULL;
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183 |
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184 | opt_complementary = "d--s:s--d"
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185 | IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
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186 | IF_LONG_OPTS(applet_long_options = date_longopts;)
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187 | opt = getopt32(argv, "Rs:ud:r:"
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188 | IF_FEATURE_DATE_ISOFMT("I::D:"),
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189 | &date_str, &date_str, &filename
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190 | IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
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191 | argv += optind;
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192 | maybe_set_utc(opt);
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193 |
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194 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) {
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195 | ifmt = 0; /* default is date */
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196 | if (isofmt_arg) {
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197 | static const char isoformats[] ALIGN1 =
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198 | "date\0""hours\0""minutes\0""seconds\0"; /* ns? */
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199 | ifmt = index_in_substrings(isoformats, isofmt_arg);
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200 | if (ifmt < 0)
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201 | bb_show_usage();
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202 | }
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203 | }
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204 |
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205 | fmt_dt2str = NULL;
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206 | if (argv[0] && argv[0][0] == '+') {
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207 | fmt_dt2str = &argv[0][1]; /* skip over the '+' */
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208 | argv++;
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209 | }
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210 | if (!(opt & (OPT_SET | OPT_DATE))) {
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211 | opt |= OPT_SET;
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212 | date_str = argv[0]; /* can be NULL */
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213 | if (date_str) {
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214 | #if ENABLE_FEATURE_DATE_COMPAT
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215 | int len = strspn(date_str, "0123456789");
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216 | if (date_str[len] == '\0'
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217 | || (date_str[len] == '.'
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218 | && isdigit(date_str[len+1])
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219 | && isdigit(date_str[len+2])
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220 | && date_str[len+3] == '\0'
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221 | )
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222 | ) {
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223 | /* Dreaded MMDDhhmm[[CC]YY][.ss] format!
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224 | * It does not match -d or -s format.
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225 | * Some users actually do use it.
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226 | */
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227 | len -= 8;
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228 | if (len < 0 || len > 4 || (len & 1))
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229 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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230 | if (len != 0) { /* move YY or CCYY to front */
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231 | char buf[4];
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232 | memcpy(buf, date_str + 8, len);
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233 | memmove(date_str + len, date_str, 8);
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234 | memcpy(date_str, buf, len);
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235 | }
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236 | }
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237 | #endif
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238 | argv++;
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239 | }
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240 | }
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241 | if (*argv)
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242 | bb_show_usage();
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243 |
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244 | /* Now we have parsed all the information except the date format
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245 | * which depends on whether the clock is being set or read */
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246 |
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247 | if (opt & OPT_REFERENCE) {
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248 | struct stat statbuf;
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249 | xstat(filename, &statbuf);
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250 | ts.tv_sec = statbuf.st_mtime;
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251 | #if ENABLE_FEATURE_DATE_NANO
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252 | ts.tv_nsec = statbuf.st_mtim.tv_nsec;
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253 | /* some toolchains use .st_mtimensec instead of st_mtim.tv_nsec */
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254 | #endif
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255 | } else {
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256 | #if ENABLE_FEATURE_DATE_NANO
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257 | /* libc has incredibly messy way of doing this,
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258 | * typically requiring -lrt. We just skip all this mess */
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259 | syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts);
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260 | #else
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261 | time(&ts.tv_sec);
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262 | #endif
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263 | }
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264 | localtime_r(&ts.tv_sec, &tm_time);
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265 |
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266 | /* If date string is given, update tm_time, and maybe set date */
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267 | if (date_str != NULL) {
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268 | /* Zero out fields - take her back to midnight! */
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269 | tm_time.tm_sec = 0;
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270 | tm_time.tm_min = 0;
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271 | tm_time.tm_hour = 0;
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272 |
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273 | /* Process any date input to UNIX time since 1 Jan 1970 */
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274 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) {
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275 | if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
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276 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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277 | } else {
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278 | parse_datestr(date_str, &tm_time);
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279 | }
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280 |
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281 | /* Correct any day of week and day of year etc. fields */
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282 | tm_time.tm_isdst = -1; /* Be sure to recheck dst */
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283 | ts.tv_sec = validate_tm_time(date_str, &tm_time);
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284 |
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285 | maybe_set_utc(opt);
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286 |
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287 | /* if setting time, set it */
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288 | if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
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289 | bb_perror_msg("can't set date");
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290 | }
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291 | }
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292 |
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293 | /* Display output */
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294 |
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295 | /* Deal with format string */
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296 | if (fmt_dt2str == NULL) {
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297 | int i;
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298 | fmt_dt2str = buf_fmt_dt2str;
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299 | if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
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300 | /* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */
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301 | strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S");
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302 | i = 8 + 3 * ifmt;
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303 | if (ifmt != 0) {
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304 | /* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */
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305 | format_utc:
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306 | fmt_dt2str[i++] = '%';
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307 | fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z';
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308 | }
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309 | fmt_dt2str[i] = '\0';
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310 | } else if (opt & OPT_RFC2822) {
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311 | /* -R. undo busybox.c setlocale */
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312 | if (ENABLE_LOCALE_SUPPORT)
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313 | setlocale(LC_TIME, "C");
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314 | strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
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315 | i = sizeof("%a, %d %b %Y %H:%M:%S ")-1;
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316 | goto format_utc;
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317 | } else { /* default case */
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318 | fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
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319 | }
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320 | }
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321 | #if ENABLE_FEATURE_DATE_NANO
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322 | else {
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323 | /* User-specified fmt_dt2str */
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324 | /* Search for and process "%N" */
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325 | char *p = fmt_dt2str;
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326 | while ((p = strchr(p, '%')) != NULL) {
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327 | int n, m;
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328 | unsigned pres, scale;
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329 |
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330 | p++;
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331 | if (*p == '%') {
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332 | p++;
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333 | continue;
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334 | }
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335 | n = strspn(p, "0123456789");
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336 | if (p[n] != 'N') {
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337 | p += n;
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338 | continue;
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339 | }
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340 | /* We have "%[nnn]N" */
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341 | p[-1] = '\0';
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342 | p[n] = '\0';
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343 | scale = 1;
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344 | pres = 9;
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345 | if (n) {
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346 | pres = xatoi_positive(p);
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347 | if (pres == 0)
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348 | pres = 9;
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349 | m = 9 - pres;
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350 | while (--m >= 0)
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351 | scale *= 10;
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352 | }
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353 |
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354 | m = p - fmt_dt2str;
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355 | p += n + 1;
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356 | fmt_dt2str = xasprintf("%s%0*u%s", fmt_dt2str, pres, (unsigned)ts.tv_nsec / scale, p);
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357 | p = fmt_dt2str + m;
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358 | }
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359 | }
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360 | #endif
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361 |
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362 | #define date_buf bb_common_bufsiz1
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363 | if (*fmt_dt2str == '\0') {
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364 | /* With no format string, just print a blank line */
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365 | date_buf[0] = '\0';
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366 | } else {
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367 | /* Handle special conversions */
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368 | if (strncmp(fmt_dt2str, "%f", 2) == 0) {
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369 | fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
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370 | }
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371 | /* Generate output string */
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372 | strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);
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373 | }
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374 | puts(date_buf);
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375 |
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376 | return EXIT_SUCCESS;
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377 | }
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