libbb/time.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright (C) 2007 Denys Vlasenko
   6  *
   7  * Licensed under GPL version 2, see file LICENSE in this tarball for details.
   8  */
   9 #include "libbb.h"
  10
  11 void FAST_FUNC parse_datestr(const char *date_str, struct tm *tm_time)
  12 {
  13         char end = '\0';
  14         const char *last_colon = strrchr(date_str, ':');
  15
  16         if (last_colon != NULL) {
  17                 /* Parse input and assign appropriately to tm_time */
  18
  19                 /* HH:MM */
  20                 if (sscanf(date_str, "%u:%u%c",
  21                                         &tm_time->tm_hour,
  22                                         &tm_time->tm_min,
  23                                         &end) >= 2) {
  24                         /* no adjustments needed */
  25                 } else
  26                 /* mm.dd-HH:MM */
  27                 if (sscanf(date_str, "%u.%u-%u:%u%c",
  28                                         &tm_time->tm_mon, &tm_time->tm_mday,
  29                                         &tm_time->tm_hour, &tm_time->tm_min,
  30                                         &end) >= 4) {
  31                         /* Adjust month from 1-12 to 0-11 */
  32                         tm_time->tm_mon -= 1;
  33                 } else
  34                 /* yyyy.mm.dd-HH:MM */
  35                 if (sscanf(date_str, "%u.%u.%u-%u:%u%c", &tm_time->tm_year,
  36                                         &tm_time->tm_mon, &tm_time->tm_mday,
  37                                         &tm_time->tm_hour, &tm_time->tm_min,
  38                                         &end) >= 5) {
  39                         tm_time->tm_year -= 1900; /* Adjust years */
  40                         tm_time->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
  41                 } else
  42                 /* yyyy-mm-dd HH:MM */
  43                 if (sscanf(date_str, "%u-%u-%u %u:%u%c", &tm_time->tm_year,
  44                                         &tm_time->tm_mon, &tm_time->tm_mday,
  45                                         &tm_time->tm_hour, &tm_time->tm_min,
  46                                         &end) >= 5) {
  47                         tm_time->tm_year -= 1900; /* Adjust years */
  48                         tm_time->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
  49 //TODO: coreutils 6.9 also accepts "yyyy-mm-dd HH" (no minutes)
  50                 } else {
  51                         bb_error_msg_and_die(bb_msg_invalid_date, date_str);
  52                 }
  53                 if (end == ':') {
  54                         /* xxx:SS */
  55                         if (sscanf(last_colon + 1, "%u%c", &tm_time->tm_sec, &end) == 1)
  56                                 end = '\0';
  57                         /* else end != NUL and we error out */
  58                 }
  59         } else {
  60                 /* Googled the following on an old date manpage:
  61                  *
  62                  * The canonical representation for setting the date/time is:
  63                  * cc   Century (either 19 or 20)
  64                  * yy   Year in abbreviated form (e.g. 89, 06)
  65                  * mm   Numeric month, a number from 1 to 12
  66                  * dd   Day, a number from 1 to 31
  67                  * HH   Hour, a number from 0 to 23
  68                  * MM   Minutes, a number from 0 to 59
  69                  * .SS  Seconds, a number from 0 to 61 (with leap seconds)
  70                  * Everything but the minutes is optional
  71                  *
  72                  * This coincides with the format of "touch -t TIME"
  73                  */
  74                 int len = strchrnul(date_str, '.') - date_str;
  75
  76                 /* MM[.SS] */
  77                 if (len == 2 && sscanf(date_str, "%2u%2u%2u%2u""%2u%c" + 12,
  78                                         &tm_time->tm_min,
  79                                         &end) >= 1) {
  80                 } else
  81                 /* HHMM[.SS] */
  82                 if (len == 4 && sscanf(date_str, "%2u%2u%2u""%2u%2u%c" + 9,
  83                                         &tm_time->tm_hour,
  84                                         &tm_time->tm_min,
  85                                         &end) >= 2) {
  86                 } else
  87                 /* ddHHMM[.SS] */
  88                 if (len == 6 && sscanf(date_str, "%2u%2u""%2u%2u%2u%c" + 6,
  89                                         &tm_time->tm_mday,
  90                                         &tm_time->tm_hour,
  91                                         &tm_time->tm_min,
  92                                         &end) >= 3) {
  93                 } else
  94                 /* mmddHHMM[.SS] */
  95                 if (len == 8 && sscanf(date_str, "%2u""%2u%2u%2u%2u%c" + 3,
  96                                         &tm_time->tm_mon,
  97                                         &tm_time->tm_mday,
  98                                         &tm_time->tm_hour,
  99                                         &tm_time->tm_min,
 100                                         &end) >= 4) {
 101                         /* Adjust month from 1-12 to 0-11 */
 102                         tm_time->tm_mon -= 1;
 103                 } else
 104                 /* yymmddHHMM[.SS] */
 105                 if (len == 10 && sscanf(date_str, "%2u%2u%2u%2u%2u%c",
 106                                         &tm_time->tm_year,
 107                                         &tm_time->tm_mon,
 108                                         &tm_time->tm_mday,
 109                                         &tm_time->tm_hour,
 110                                         &tm_time->tm_min,
 111                                         &end) >= 5) {
 112                         /* Adjust month from 1-12 to 0-11 */
 113                         tm_time->tm_mon -= 1;
 114                 } else
 115                 /* ccyymmddHHMM[.SS] */
 116                 if (len == 12 && sscanf(date_str, "%4u%2u%2u%2u%2u%c",
 117                                         &tm_time->tm_year,
 118                                         &tm_time->tm_mon,
 119                                         &tm_time->tm_mday,
 120                                         &tm_time->tm_hour,
 121                                         &tm_time->tm_min,
 122                                         &end) >= 5) {
 123                         tm_time->tm_year -= 1900; /* Adjust years */
 124                         tm_time->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
 125                 } else {
 126                         bb_error_msg_and_die(bb_msg_invalid_date, date_str);
 127                 }
 128                 if (end == '.') {
 129                         /* xxx.SS */
 130                         if (sscanf(strchr(date_str, '.') + 1, "%u%c",
 131                                         &tm_time->tm_sec, &end) == 1)
 132                                 end = '\0';
 133                         /* else end != NUL and we error out */
 134                 }
 135         }
 136         if (end != '\0') {
 137                 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
 138         }
 139 }
 140
 141 time_t FAST_FUNC validate_tm_time(const char *date_str, struct tm *tm_time)
 142 {
 143         time_t t = mktime(tm_time);
 144         if (t == (time_t) -1L) {
 145                 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
 146         }
 147         return t;
 148 }
 149
 150 #if ENABLE_MONOTONIC_SYSCALL
 151
 152 #include <sys/syscall.h>
 153 /* Old glibc (< 2.3.4) does not provide this constant. We use syscall
 154  * directly so this definition is safe. */
 155 #ifndef CLOCK_MONOTONIC
 156 #define CLOCK_MONOTONIC 1
 157 #endif
 158
 159 /* libc has incredibly messy way of doing this,
 160  * typically requiring -lrt. We just skip all this mess */
 161 static void get_mono(struct timespec *ts)
 162 {
 163         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, ts))
 164                 bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
 165 }
 166 unsigned long long FAST_FUNC monotonic_ns(void)
 167 {
 168         struct timespec ts;
 169         get_mono(&ts);
 170         return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
 171 }
 172 unsigned long long FAST_FUNC monotonic_us(void)
 173 {
 174         struct timespec ts;
 175         get_mono(&ts);
 176         return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
 177 }
 178 unsigned FAST_FUNC monotonic_sec(void)
 179 {
 180         struct timespec ts;
 181         get_mono(&ts);
 182         return ts.tv_sec;
 183 }
 184
 185 #else
 186
 187 unsigned long long FAST_FUNC monotonic_ns(void)
 188 {
 189         struct timeval tv;
 190         gettimeofday(&tv, NULL);
 191         return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
 192 }
 193 unsigned long long FAST_FUNC monotonic_us(void)
 194 {
 195         struct timeval tv;
 196         gettimeofday(&tv, NULL);
 197         return tv.tv_sec * 1000000ULL + tv.tv_usec;
 198 }
 199 unsigned FAST_FUNC monotonic_sec(void)
 200 {
 201         return time(NULL);
 202 }
 203
 204 #endif