314 lines
8.1 KiB
C
314 lines
8.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 2007 Denys Vlasenko
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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void FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm)
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{
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char end = '\0';
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const char *last_colon = strrchr(date_str, ':');
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if (last_colon != NULL) {
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/* Parse input and assign appropriately to ptm */
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#if ENABLE_DESKTOP
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const char *endp;
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#endif
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/* HH:MM */
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if (sscanf(date_str, "%u:%u%c",
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&ptm->tm_hour,
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&ptm->tm_min,
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&end) >= 2
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) {
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/* no adjustments needed */
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} else
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/* mm.dd-HH:MM */
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if (sscanf(date_str, "%u.%u-%u:%u%c",
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&ptm->tm_mon, &ptm->tm_mday,
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&ptm->tm_hour, &ptm->tm_min,
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&end) >= 4
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) {
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/* Adjust month from 1-12 to 0-11 */
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ptm->tm_mon -= 1;
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} else
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/* yyyy.mm.dd-HH:MM */
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if (sscanf(date_str, "%u.%u.%u-%u:%u%c", &ptm->tm_year,
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&ptm->tm_mon, &ptm->tm_mday,
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&ptm->tm_hour, &ptm->tm_min,
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&end) >= 5
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/* yyyy-mm-dd HH:MM */
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|| sscanf(date_str, "%u-%u-%u %u:%u%c", &ptm->tm_year,
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&ptm->tm_mon, &ptm->tm_mday,
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&ptm->tm_hour, &ptm->tm_min,
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&end) >= 5
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) {
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ptm->tm_year -= 1900; /* Adjust years */
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ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
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} else
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#if ENABLE_DESKTOP /* strptime is BIG: ~1k in uclibc, ~10k in glibc */
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/* month_name d HH:MM:SS YYYY. Supported by GNU date */
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if ((endp = strptime(date_str, "%b %d %T %Y", ptm)) != NULL
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&& *endp == '\0'
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) {
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return; /* don't fall through to end == ":" check */
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} else
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#endif
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{
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bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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}
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if (end == ':') {
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/* xxx:SS */
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if (sscanf(last_colon + 1, "%u%c", &ptm->tm_sec, &end) == 1)
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end = '\0';
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/* else end != NUL and we error out */
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}
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} else
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if (strchr(date_str, '-')
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/* Why strchr('-') check?
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* sscanf below will trash ptm->tm_year, this breaks
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* if parse_str is "10101010" (iow, "MMddhhmm" form)
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* because we destroy year. Do these sscanf
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* only if we saw a dash in parse_str.
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*/
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/* yyyy-mm-dd HH */
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&& (sscanf(date_str, "%u-%u-%u %u%c", &ptm->tm_year,
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&ptm->tm_mon, &ptm->tm_mday,
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&ptm->tm_hour,
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&end) >= 4
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/* yyyy-mm-dd */
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|| sscanf(date_str, "%u-%u-%u%c", &ptm->tm_year,
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&ptm->tm_mon, &ptm->tm_mday,
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&end) >= 3
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)
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) {
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ptm->tm_year -= 1900; /* Adjust years */
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ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
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} else
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if (date_str[0] == '@') {
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time_t t = bb_strtol(date_str + 1, NULL, 10);
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if (!errno) {
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struct tm *lt = localtime(&t);
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if (lt) {
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*ptm = *lt;
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return;
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}
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}
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end = '1';
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} else {
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/* Googled the following on an old date manpage:
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*
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* The canonical representation for setting the date/time is:
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* cc Century (either 19 or 20)
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* yy Year in abbreviated form (e.g. 89, 06)
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* mm Numeric month, a number from 1 to 12
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* dd Day, a number from 1 to 31
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* HH Hour, a number from 0 to 23
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* MM Minutes, a number from 0 to 59
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* .SS Seconds, a number from 0 to 61 (with leap seconds)
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* Everything but the minutes is optional
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*
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* "touch -t DATETIME" format: [[[[[YY]YY]MM]DD]hh]mm[.ss]
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* Some, but not all, Unix "date DATETIME" commands
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* move [[YY]YY] past minutes mm field (!).
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* Coreutils date does it, and SUS mandates it.
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* (date -s DATETIME does not support this format. lovely!)
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* In bbox, this format is special-cased in date applet
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* (IOW: this function assumes "touch -t" format).
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*/
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unsigned cur_year = ptm->tm_year;
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int len = strchrnul(date_str, '.') - date_str;
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/* MM[.SS] */
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if (len == 2 && sscanf(date_str, "%2u%2u%2u%2u""%2u%c" + 12,
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&ptm->tm_min,
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&end) >= 1) {
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} else
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/* HHMM[.SS] */
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if (len == 4 && sscanf(date_str, "%2u%2u%2u""%2u%2u%c" + 9,
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&ptm->tm_hour,
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&ptm->tm_min,
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&end) >= 2) {
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} else
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/* ddHHMM[.SS] */
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if (len == 6 && sscanf(date_str, "%2u%2u""%2u%2u%2u%c" + 6,
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&ptm->tm_mday,
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&ptm->tm_hour,
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&ptm->tm_min,
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&end) >= 3) {
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} else
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/* mmddHHMM[.SS] */
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if (len == 8 && sscanf(date_str, "%2u""%2u%2u%2u%2u%c" + 3,
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&ptm->tm_mon,
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&ptm->tm_mday,
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&ptm->tm_hour,
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&ptm->tm_min,
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&end) >= 4) {
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/* Adjust month from 1-12 to 0-11 */
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ptm->tm_mon -= 1;
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} else
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/* yymmddHHMM[.SS] */
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if (len == 10 && sscanf(date_str, "%2u%2u%2u%2u%2u%c",
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&ptm->tm_year,
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&ptm->tm_mon,
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&ptm->tm_mday,
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&ptm->tm_hour,
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&ptm->tm_min,
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&end) >= 5) {
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/* Adjust month from 1-12 to 0-11 */
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ptm->tm_mon -= 1;
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if ((int)cur_year >= 50) { /* >= 1950 */
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/* Adjust year: */
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/* 1. Put it in the current century */
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ptm->tm_year += (cur_year / 100) * 100;
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/* 2. If too far in the past, +100 years */
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if (ptm->tm_year < cur_year - 50)
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ptm->tm_year += 100;
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/* 3. If too far in the future, -100 years */
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if (ptm->tm_year > cur_year + 50)
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ptm->tm_year -= 100;
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}
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} else
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/* ccyymmddHHMM[.SS] */
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if (len == 12 && sscanf(date_str, "%4u%2u%2u%2u%2u%c",
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&ptm->tm_year,
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&ptm->tm_mon,
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&ptm->tm_mday,
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&ptm->tm_hour,
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&ptm->tm_min,
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&end) >= 5) {
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ptm->tm_year -= 1900; /* Adjust years */
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ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
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} else {
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err:
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bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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}
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ptm->tm_sec = 0; /* assume zero if [.SS] is not given */
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if (end == '.') {
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/* xxx.SS */
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if (sscanf(strchr(date_str, '.') + 1, "%u%c",
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&ptm->tm_sec, &end) == 1)
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end = '\0';
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/* else end != NUL and we error out */
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}
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/* Users were confused by "date -s 20180923"
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* working (not in the way they were expecting).
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* It was interpreted as MMDDhhmm, and not bothered by
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* "month #20" in the least. Prevent such cases:
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*/
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if (ptm->tm_sec > 60 /* allow "23:60" leap second */
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|| ptm->tm_min > 59
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|| ptm->tm_hour > 23
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|| ptm->tm_mday > 31
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|| ptm->tm_mon > 11 /* month# is 0..11, not 1..12 */
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) {
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goto err;
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}
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}
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if (end != '\0') {
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bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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}
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}
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time_t FAST_FUNC validate_tm_time(const char *date_str, struct tm *ptm)
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{
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time_t t = mktime(ptm);
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if (t == (time_t) -1L) {
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bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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}
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return t;
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}
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static char* strftime_fmt(char *buf, unsigned len, time_t *tp, const char *fmt)
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{
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time_t t;
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if (!tp) {
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tp = &t;
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time(tp);
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}
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/* Returns pointer to NUL */
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return buf + strftime(buf, len, fmt, localtime(tp));
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}
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char* FAST_FUNC strftime_HHMMSS(char *buf, unsigned len, time_t *tp)
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{
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return strftime_fmt(buf, len, tp, "%H:%M:%S");
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}
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char* FAST_FUNC strftime_YYYYMMDDHHMMSS(char *buf, unsigned len, time_t *tp)
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{
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return strftime_fmt(buf, len, tp, "%Y-%m-%d %H:%M:%S");
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}
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#if ENABLE_MONOTONIC_SYSCALL
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#include <sys/syscall.h>
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/* Old glibc (< 2.3.4) does not provide this constant. We use syscall
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* directly so this definition is safe. */
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#ifndef CLOCK_MONOTONIC
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#define CLOCK_MONOTONIC 1
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#endif
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/* libc has incredibly messy way of doing this,
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* typically requiring -lrt. We just skip all this mess */
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static void get_mono(struct timespec *ts)
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{
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if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, ts))
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bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
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}
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unsigned long long FAST_FUNC monotonic_ns(void)
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{
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struct timespec ts;
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get_mono(&ts);
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return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
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}
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unsigned long long FAST_FUNC monotonic_us(void)
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{
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struct timespec ts;
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get_mono(&ts);
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return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
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}
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unsigned long long FAST_FUNC monotonic_ms(void)
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{
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struct timespec ts;
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get_mono(&ts);
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return ts.tv_sec * 1000ULL + ts.tv_nsec/1000000;
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}
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unsigned FAST_FUNC monotonic_sec(void)
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{
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struct timespec ts;
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get_mono(&ts);
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return ts.tv_sec;
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}
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#else
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unsigned long long FAST_FUNC monotonic_ns(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
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}
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unsigned long long FAST_FUNC monotonic_us(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec * 1000000ULL + tv.tv_usec;
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}
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unsigned long long FAST_FUNC monotonic_ms(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec * 1000ULL + tv.tv_usec / 1000;
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}
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unsigned FAST_FUNC monotonic_sec(void)
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{
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return time(NULL);
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}
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#endif
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