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                 if (sscanf(date_str, "%u:%u%c",
  20                                         &tm_time->tm_hour,
  21                                         &tm_time->tm_min,
  22                                         &end) >= 2) {
  23                         /* no adjustments needed */
  24                 } else if (sscanf(date_str, "%u.%u-%u:%u%c",
  25                                         &tm_time->tm_mon, &tm_time->tm_mday,
  26                                         &tm_time->tm_hour, &tm_time->tm_min,
  27                                         &end) >= 4) {
  28                         /* Adjust dates from 1-12 to 0-11 */
  29                         tm_time->tm_mon -= 1;
  30                 } else if (sscanf(date_str, "%u.%u.%u-%u:%u%c", &tm_time->tm_year,
  31                                         &tm_time->tm_mon, &tm_time->tm_mday,
  32                                         &tm_time->tm_hour, &tm_time->tm_min,
  33                                         &end) >= 5) {
  34                         tm_time->tm_year -= 1900; /* Adjust years */
  35                         tm_time->tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
  36                 } else if (sscanf(date_str, "%u-%u-%u %u:%u%c", &tm_time->tm_year,
  37                                         &tm_time->tm_mon, &tm_time->tm_mday,
  38                                         &tm_time->tm_hour, &tm_time->tm_min,
  39                                         &end) >= 5) {
  40                         tm_time->tm_year -= 1900; /* Adjust years */
  41                         tm_time->tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
  42 //TODO: coreutils 6.9 also accepts "YYYY-MM-DD HH" (no minutes)
  43                 } else {
  44                         bb_error_msg_and_die(bb_msg_invalid_date, date_str);
  45                 }
  46                 if (end == ':') {
  47                         if (sscanf(last_colon + 1, "%u%c", &tm_time->tm_sec, &end) == 1)
  48                                 end = '\0';
  49                         /* else end != NUL and we error out */
  50                 }
  51         } else {
  52                 if (sscanf(date_str, "%2u%2u%2u%2u%u%c", &tm_time->tm_mon,
  53                                 &tm_time->tm_mday, &tm_time->tm_hour, &tm_time->tm_min,
  54                                 &tm_time->tm_year, &end) < 4)
  55                         bb_error_msg_and_die(bb_msg_invalid_date, date_str);
  56                 /* correct for century  - minor Y2K problem here? */
  57                 if (tm_time->tm_year >= 1900) {
  58                         tm_time->tm_year -= 1900;
  59                 }
  60                 /* adjust date */
  61                 tm_time->tm_mon -= 1;
  62                 if (end == '.') {
  63                         if (sscanf(strchr(date_str, '.') + 1, "%u%c",
  64                                         &tm_time->tm_sec, &end) == 1)
  65                                 end = '\0';
  66                         /* else end != NUL and we error out */
  67                 }
  68         }
  69         if (end != '\0') {
  70                 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
  71         }
  72 }
  73
  74 #if ENABLE_MONOTONIC_SYSCALL
  75
  76 #include <sys/syscall.h>
  77 /* Old glibc (< 2.3.4) does not provide this constant. We use syscall
  78  * directly so this definition is safe. */
  79 #ifndef CLOCK_MONOTONIC
  80 #define CLOCK_MONOTONIC 1
  81 #endif
  82
  83 /* libc has incredibly messy way of doing this,
  84  * typically requiring -lrt. We just skip all this mess */
  85 static void get_mono(struct timespec *ts)
  86 {
  87         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, ts))
  88                 bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
  89 }
  90 unsigned long long FAST_FUNC monotonic_ns(void)
  91 {
  92         struct timespec ts;
  93         get_mono(&ts);
  94         return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
  95 }
  96 unsigned long long FAST_FUNC monotonic_us(void)
  97 {
  98         struct timespec ts;
  99         get_mono(&ts);
 100         return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
 101 }
 102 unsigned FAST_FUNC monotonic_sec(void)
 103 {
 104         struct timespec ts;
 105         get_mono(&ts);
 106         return ts.tv_sec;
 107 }
 108
 109 #else
 110
 111 unsigned long long FAST_FUNC monotonic_ns(void)
 112 {
 113         struct timeval tv;
 114         gettimeofday(&tv, NULL);
 115         return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
 116 }
 117 unsigned long long FAST_FUNC monotonic_us(void)
 118 {
 119         struct timeval tv;
 120         gettimeofday(&tv, NULL);
 121         return tv.tv_sec * 1000000ULL + tv.tv_usec;
 122 }
 123 unsigned FAST_FUNC monotonic_sec(void)
 124 {
 125         return time(NULL);
 126 }
 127
 128 #endif