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 GPLv2, see file LICENSE in this source tree.
   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                 ) {
  28                         /* no adjustments needed */
  29                 } else
  30                 /* mm.dd-HH:MM */
  31                 if (sscanf(date_str, "%u.%u-%u:%u%c",
  32                                         &ptm->tm_mon, &ptm->tm_mday,
  33                                         &ptm->tm_hour, &ptm->tm_min,
  34                                         &end) >= 4
  35                 ) {
  36                         /* Adjust month from 1-12 to 0-11 */
  37                         ptm->tm_mon -= 1;
  38                 } else
  39                 /* yyyy.mm.dd-HH:MM */
  40                 if (sscanf(date_str, "%u.%u.%u-%u:%u%c", &ptm->tm_year,
  41                                         &ptm->tm_mon, &ptm->tm_mday,
  42                                         &ptm->tm_hour, &ptm->tm_min,
  43                                         &end) >= 5
  44                 /* yyyy-mm-dd HH:MM */
  45                  || sscanf(date_str, "%u-%u-%u %u:%u%c", &ptm->tm_year,
  46                                         &ptm->tm_mon, &ptm->tm_mday,
  47                                         &ptm->tm_hour, &ptm->tm_min,
  48                                         &end) >= 5
  49                 ) {
  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                 {
  62                         bb_error_msg_and_die(bb_msg_invalid_date, date_str);
  63                 }
  64                 if (end == ':') {
  65                         /* xxx:SS */
  66                         if (sscanf(last_colon + 1, "%u%c", &ptm->tm_sec, &end) == 1)
  67                                 end = '\0';
  68                         /* else end != NUL and we error out */
  69                 }
  70         } else
  71         /* yyyy-mm-dd HH */
  72         if (sscanf(date_str, "%u-%u-%u %u%c", &ptm->tm_year,
  73                                 &ptm->tm_mon, &ptm->tm_mday,
  74                                 &ptm->tm_hour,
  75                                 &end) >= 4
  76         /* yyyy-mm-dd */
  77          || sscanf(date_str, "%u-%u-%u%c", &ptm->tm_year,
  78                                 &ptm->tm_mon, &ptm->tm_mday,
  79                                 &end) >= 3
  80         ) {
  81                 ptm->tm_year -= 1900; /* Adjust years */
  82                 ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
  83         } else
  84         if (date_str[0] == '@') {
  85                 time_t t = bb_strtol(date_str + 1, NULL, 10);
  86                 if (!errno) {
  87                         struct tm *lt = localtime(&t);
  88                         if (lt) {
  89                                 *ptm = *lt;
  90                                 return;
  91                         }
  92                 }
  93                 end = '1';
  94         } else {
  95                 /* Googled the following on an old date manpage:
  96                  *
  97                  * The canonical representation for setting the date/time is:
  98                  * cc   Century (either 19 or 20)
  99                  * yy   Year in abbreviated form (e.g. 89, 06)
 100                  * mm   Numeric month, a number from 1 to 12
 101                  * dd   Day, a number from 1 to 31
 102                  * HH   Hour, a number from 0 to 23
 103                  * MM   Minutes, a number from 0 to 59
 104                  * .SS  Seconds, a number from 0 to 61 (with leap seconds)
 105                  * Everything but the minutes is optional
 106                  *
 107                  * "touch -t DATETIME" format: [[[[[YY]YY]MM]DD]hh]mm[.ss]
 108                  * Some, but not all, Unix "date DATETIME" commands
 109                  * move [[YY]YY] past minutes mm field (!).
 110                  * Coreutils date does it, and SUS mandates it.
 111                  * (date -s DATETIME does not support this format. lovely!)
 112                  * In bbox, this format is special-cased in date applet
 113                  * (IOW: this function assumes "touch -t" format).
 114                  */
 115                 unsigned cur_year = ptm->tm_year;
 116                 int len = strchrnul(date_str, '.') - date_str;
 117
 118                 /* MM[.SS] */
 119                 if (len == 2 && sscanf(date_str, "%2u%2u%2u%2u""%2u%c" + 12,
 120                                         &ptm->tm_min,
 121                                         &end) >= 1) {
 122                 } else
 123                 /* HHMM[.SS] */
 124                 if (len == 4 && sscanf(date_str, "%2u%2u%2u""%2u%2u%c" + 9,
 125                                         &ptm->tm_hour,
 126                                         &ptm->tm_min,
 127                                         &end) >= 2) {
 128                 } else
 129                 /* ddHHMM[.SS] */
 130                 if (len == 6 && sscanf(date_str, "%2u%2u""%2u%2u%2u%c" + 6,
 131                                         &ptm->tm_mday,
 132                                         &ptm->tm_hour,
 133                                         &ptm->tm_min,
 134                                         &end) >= 3) {
 135                 } else
 136                 /* mmddHHMM[.SS] */
 137                 if (len == 8 && sscanf(date_str, "%2u""%2u%2u%2u%2u%c" + 3,
 138                                         &ptm->tm_mon,
 139                                         &ptm->tm_mday,
 140                                         &ptm->tm_hour,
 141                                         &ptm->tm_min,
 142                                         &end) >= 4) {
 143                         /* Adjust month from 1-12 to 0-11 */
 144                         ptm->tm_mon -= 1;
 145                 } else
 146                 /* yymmddHHMM[.SS] */
 147                 if (len == 10 && sscanf(date_str, "%2u%2u%2u%2u%2u%c",
 148                                         &ptm->tm_year,
 149                                         &ptm->tm_mon,
 150                                         &ptm->tm_mday,
 151                                         &ptm->tm_hour,
 152                                         &ptm->tm_min,
 153                                         &end) >= 5) {
 154                         /* Adjust month from 1-12 to 0-11 */
 155                         ptm->tm_mon -= 1;
 156                         if ((int)cur_year >= 50) { /* >= 1950 */
 157                                 /* Adjust year: */
 158                                 /* 1. Put it in the current century */
 159                                 ptm->tm_year += (cur_year / 100) * 100;
 160                                 /* 2. If too far in the past, +100 years */
 161                                 if (ptm->tm_year < cur_year - 50)
 162                                         ptm->tm_year += 100;
 163                                 /* 3. If too far in the future, -100 years */
 164                                 if (ptm->tm_year > cur_year + 50)
 165                                         ptm->tm_year -= 100;
 166                         }
 167                 } else
 168                 /* ccyymmddHHMM[.SS] */
 169                 if (len == 12 && sscanf(date_str, "%4u%2u%2u%2u%2u%c",
 170                                         &ptm->tm_year,
 171                                         &ptm->tm_mon,
 172                                         &ptm->tm_mday,
 173                                         &ptm->tm_hour,
 174                                         &ptm->tm_min,
 175                                         &end) >= 5) {
 176                         ptm->tm_year -= 1900; /* Adjust years */
 177                         ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
 178                 } else {
 179                         bb_error_msg_and_die(bb_msg_invalid_date, date_str);
 180                 }
 181                 if (end == '.') {
 182                         /* xxx.SS */
 183                         if (sscanf(strchr(date_str, '.') + 1, "%u%c",
 184                                         &ptm->tm_sec, &end) == 1)
 185                                 end = '\0';
 186                         /* else end != NUL and we error out */
 187                 }
 188         }
 189         if (end != '\0') {
 190                 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
 191         }
 192 }
 193
 194 time_t FAST_FUNC validate_tm_time(const char *date_str, struct tm *ptm)
 195 {
 196         time_t t = mktime(ptm);
 197         if (t == (time_t) -1L) {
 198                 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
 199         }
 200         return t;
 201 }
 202
 203 static char* strftime_fmt(char *buf, unsigned len, time_t *tp, const char *fmt)
 204 {
 205         time_t t;
 206         if (!tp) {
 207                 tp = &t;
 208                 time(tp);
 209         }
 210         /* Returns pointer to NUL */
 211         return buf + strftime(buf, len, fmt, localtime(tp));
 212 }
 213
 214 char* FAST_FUNC strftime_HHMMSS(char *buf, unsigned len, time_t *tp)
 215 {
 216         return strftime_fmt(buf, len, tp, "%H:%M:%S");
 217 }
 218
 219 char* FAST_FUNC strftime_YYYYMMDDHHMMSS(char *buf, unsigned len, time_t *tp)
 220 {
 221         return strftime_fmt(buf, len, tp, "%Y-%m-%d %H:%M:%S");
 222 }
 223
 224 #if ENABLE_MONOTONIC_SYSCALL
 225
 226 #include <sys/syscall.h>
 227 /* Old glibc (< 2.3.4) does not provide this constant. We use syscall
 228  * directly so this definition is safe. */
 229 #ifndef CLOCK_MONOTONIC
 230 #define CLOCK_MONOTONIC 1
 231 #endif
 232
 233 /* libc has incredibly messy way of doing this,
 234  * typically requiring -lrt. We just skip all this mess */
 235 static void get_mono(struct timespec *ts)
 236 {
 237         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, ts))
 238                 bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
 239 }
 240 unsigned long long FAST_FUNC monotonic_ns(void)
 241 {
 242         struct timespec ts;
 243         get_mono(&ts);
 244         return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
 245 }
 246 unsigned long long FAST_FUNC monotonic_us(void)
 247 {
 248         struct timespec ts;
 249         get_mono(&ts);
 250         return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
 251 }
 252 unsigned long long FAST_FUNC monotonic_ms(void)
 253 {
 254         struct timespec ts;
 255         get_mono(&ts);
 256         return ts.tv_sec * 1000ULL + ts.tv_nsec/1000000;
 257 }
 258 unsigned FAST_FUNC monotonic_sec(void)
 259 {
 260         struct timespec ts;
 261         get_mono(&ts);
 262         return ts.tv_sec;
 263 }
 264
 265 #else
 266
 267 unsigned long long FAST_FUNC monotonic_ns(void)
 268 {
 269         struct timeval tv;
 270         gettimeofday(&tv, NULL);
 271         return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
 272 }
 273 unsigned long long FAST_FUNC monotonic_us(void)
 274 {
 275         struct timeval tv;
 276         gettimeofday(&tv, NULL);
 277         return tv.tv_sec * 1000000ULL + tv.tv_usec;
 278 }
 279 unsigned long long FAST_FUNC monotonic_ms(void)
 280 {
 281         struct timeval tv;
 282         gettimeofday(&tv, NULL);
 283         return tv.tv_sec * 1000ULL + tv.tv_usec / 1000;
 284 }
 285 unsigned FAST_FUNC monotonic_sec(void)
 286 {
 287         return time(NULL);
 288 }
 289
 290 #endif