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 *ptm)
  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 ptm */
  18 #if ENABLE_DESKTOP
  19                 const char *endp;
  20 #endif
  21
  22                 /* HH:MM */
  23                 if (sscanf(date_str, "%u:%u%c",
  24                                         &ptm->tm_hour,
  25                                         &ptm->tm_min,
  26                                         &end) >= 2) {
  27                         /* no adjustments needed */
  28                 } else
  29                 /* mm.dd-HH:MM */
  30                 if (sscanf(date_str, "%u.%u-%u:%u%c",
  31                                         &ptm->tm_mon, &ptm->tm_mday,
  32                                         &ptm->tm_hour, &ptm->tm_min,
  33                                         &end) >= 4) {
  34                         /* Adjust month from 1-12 to 0-11 */
  35                         ptm->tm_mon -= 1;
  36                 } else
  37                 /* yyyy.mm.dd-HH:MM */
  38                 if (sscanf(date_str, "%u.%u.%u-%u:%u%c", &ptm->tm_year,
  39                                         &ptm->tm_mon, &ptm->tm_mday,
  40                                         &ptm->tm_hour, &ptm->tm_min,
  41                                         &end) >= 5) {
  42                         ptm->tm_year -= 1900; /* Adjust years */
  43                         ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
  44                 } else
  45                 /* yyyy-mm-dd HH:MM */
  46                 if (sscanf(date_str, "%u-%u-%u %u:%u%c", &ptm->tm_year,
  47                                         &ptm->tm_mon, &ptm->tm_mday,
  48                                         &ptm->tm_hour, &ptm->tm_min,
  49                                         &end) >= 5) {
  50                         ptm->tm_year -= 1900; /* Adjust years */
  51                         ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
  52                 } else
  53 #if ENABLE_DESKTOP  /* strptime is BIG: ~1k in uclibc, ~10k in glibc */
  54                 /* month_name d HH:MM:SS YYYY. Supported by GNU date */
  55                 if ((endp = strptime(date_str, "%b %d %T %Y", ptm)) != NULL
  56                  && *endp == '\0'
  57                 ) {
  58                         return; /* don't fall through to end == ":" check */
  59                 } else
  60 #endif
  61 //TODO: coreutils 6.9 also accepts "yyyy-mm-dd HH" (no minutes)
  62                 {
  63                         bb_error_msg_and_die(bb_msg_invalid_date, date_str);
  64                 }
  65                 if (end == ':') {
  66                         /* xxx:SS */
  67                         if (sscanf(last_colon + 1, "%u%c", &ptm->tm_sec, &end) == 1)
  68                                 end = '\0';
  69                         /* else end != NUL and we error out */
  70                 }
  71         } else {
  72                 /* Googled the following on an old date manpage:
  73                  *
  74                  * The canonical representation for setting the date/time is:
  75                  * cc   Century (either 19 or 20)
  76                  * yy   Year in abbreviated form (e.g. 89, 06)
  77                  * mm   Numeric month, a number from 1 to 12
  78                  * dd   Day, a number from 1 to 31
  79                  * HH   Hour, a number from 0 to 23
  80                  * MM   Minutes, a number from 0 to 59
  81                  * .SS  Seconds, a number from 0 to 61 (with leap seconds)
  82                  * Everything but the minutes is optional
  83                  *
  84                  * This coincides with the format of "touch -t TIME"
  85                  */
  86                 int len = strchrnul(date_str, '.') - date_str;
  87
  88                 /* MM[.SS] */
  89                 if (len == 2 && sscanf(date_str, "%2u%2u%2u%2u""%2u%c" + 12,
  90                                         &ptm->tm_min,
  91                                         &end) >= 1) {
  92                 } else
  93                 /* HHMM[.SS] */
  94                 if (len == 4 && sscanf(date_str, "%2u%2u%2u""%2u%2u%c" + 9,
  95                                         &ptm->tm_hour,
  96                                         &ptm->tm_min,
  97                                         &end) >= 2) {
  98                 } else
  99                 /* ddHHMM[.SS] */
 100                 if (len == 6 && sscanf(date_str, "%2u%2u""%2u%2u%2u%c" + 6,
 101                                         &ptm->tm_mday,
 102                                         &ptm->tm_hour,
 103                                         &ptm->tm_min,
 104                                         &end) >= 3) {
 105                 } else
 106                 /* mmddHHMM[.SS] */
 107                 if (len == 8 && sscanf(date_str, "%2u""%2u%2u%2u%2u%c" + 3,
 108                                         &ptm->tm_mon,
 109                                         &ptm->tm_mday,
 110                                         &ptm->tm_hour,
 111                                         &ptm->tm_min,
 112                                         &end) >= 4) {
 113                         /* Adjust month from 1-12 to 0-11 */
 114                         ptm->tm_mon -= 1;
 115                 } else
 116                 /* yymmddHHMM[.SS] */
 117                 if (len == 10 && sscanf(date_str, "%2u%2u%2u%2u%2u%c",
 118                                         &ptm->tm_year,
 119                                         &ptm->tm_mon,
 120                                         &ptm->tm_mday,
 121                                         &ptm->tm_hour,
 122                                         &ptm->tm_min,
 123                                         &end) >= 5) {
 124                         /* Adjust month from 1-12 to 0-11 */
 125                         ptm->tm_mon -= 1;
 126                 } else
 127                 /* ccyymmddHHMM[.SS] */
 128                 if (len == 12 && sscanf(date_str, "%4u%2u%2u%2u%2u%c",
 129                                         &ptm->tm_year,
 130                                         &ptm->tm_mon,
 131                                         &ptm->tm_mday,
 132                                         &ptm->tm_hour,
 133                                         &ptm->tm_min,
 134                                         &end) >= 5) {
 135                         ptm->tm_year -= 1900; /* Adjust years */
 136                         ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
 137                 } else {
 138                         bb_error_msg_and_die(bb_msg_invalid_date, date_str);
 139                 }
 140                 if (end == '.') {
 141                         /* xxx.SS */
 142                         if (sscanf(strchr(date_str, '.') + 1, "%u%c",
 143                                         &ptm->tm_sec, &end) == 1)
 144                                 end = '\0';
 145                         /* else end != NUL and we error out */
 146                 }
 147         }
 148         if (end != '\0') {
 149                 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
 150         }
 151 }
 152
 153 time_t FAST_FUNC validate_tm_time(const char *date_str, struct tm *ptm)
 154 {
 155         time_t t = mktime(ptm);
 156         if (t == (time_t) -1L) {
 157                 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
 158         }
 159         return t;
 160 }
 161
 162 #if ENABLE_MONOTONIC_SYSCALL
 163
 164 #include <sys/syscall.h>
 165 /* Old glibc (< 2.3.4) does not provide this constant. We use syscall
 166  * directly so this definition is safe. */
 167 #ifndef CLOCK_MONOTONIC
 168 #define CLOCK_MONOTONIC 1
 169 #endif
 170
 171 /* libc has incredibly messy way of doing this,
 172  * typically requiring -lrt. We just skip all this mess */
 173 static void get_mono(struct timespec *ts)
 174 {
 175         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, ts))
 176                 bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
 177 }
 178 unsigned long long FAST_FUNC monotonic_ns(void)
 179 {
 180         struct timespec ts;
 181         get_mono(&ts);
 182         return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
 183 }
 184 unsigned long long FAST_FUNC monotonic_us(void)
 185 {
 186         struct timespec ts;
 187         get_mono(&ts);
 188         return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
 189 }
 190 unsigned long long FAST_FUNC monotonic_ms(void)
 191 {
 192         struct timespec ts;
 193         get_mono(&ts);
 194         return ts.tv_sec * 1000ULL + ts.tv_nsec/1000000;
 195 }
 196 unsigned FAST_FUNC monotonic_sec(void)
 197 {
 198         struct timespec ts;
 199         get_mono(&ts);
 200         return ts.tv_sec;
 201 }
 202
 203 #else
 204
 205 unsigned long long FAST_FUNC monotonic_ns(void)
 206 {
 207         struct timeval tv;
 208         gettimeofday(&tv, NULL);
 209         return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
 210 }
 211 unsigned long long FAST_FUNC monotonic_us(void)
 212 {
 213         struct timeval tv;
 214         gettimeofday(&tv, NULL);
 215         return tv.tv_sec * 1000000ULL + tv.tv_usec;
 216 }
 217 unsigned long long FAST_FUNC monotonic_ms(void)
 218 {
 219         struct timeval tv;
 220         gettimeofday(&tv, NULL);
 221         return tv.tv_sec * 1000ULL + tv.tv_usec / 1000;
 222 }
 223 unsigned FAST_FUNC monotonic_sec(void)
 224 {
 225         return time(NULL);
 226 }
 227
 228 #endif