source: MondoRescue/branches/3.2/mindi-busybox/libbb/time.c@ 3232

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 10 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 6.7 KB
Line 
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
11void 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 if (date_str[0] == '@') {
72 time_t t = bb_strtol(date_str + 1, NULL, 10);
73 if (!errno) {
74 struct tm *lt = localtime(&t);
75 if (lt) {
76 *ptm = *lt;
77 return;
78 }
79 }
80 end = '1';
81 } else {
82 /* Googled the following on an old date manpage:
83 *
84 * The canonical representation for setting the date/time is:
85 * cc Century (either 19 or 20)
86 * yy Year in abbreviated form (e.g. 89, 06)
87 * mm Numeric month, a number from 1 to 12
88 * dd Day, a number from 1 to 31
89 * HH Hour, a number from 0 to 23
90 * MM Minutes, a number from 0 to 59
91 * .SS Seconds, a number from 0 to 61 (with leap seconds)
92 * Everything but the minutes is optional
93 *
94 * "touch -t DATETIME" format: [[[[[YY]YY]MM]DD]hh]mm[.ss]
95 * Some, but not all, Unix "date DATETIME" commands
96 * move [[YY]YY] past minutes mm field (!).
97 * Coreutils date does it, and SUS mandates it.
98 * (date -s DATETIME does not support this format. lovely!)
99 * In bbox, this format is special-cased in date applet
100 * (IOW: this function assumes "touch -t" format).
101 */
102 unsigned cur_year = ptm->tm_year;
103 int len = strchrnul(date_str, '.') - date_str;
104
105 /* MM[.SS] */
106 if (len == 2 && sscanf(date_str, "%2u%2u%2u%2u""%2u%c" + 12,
107 &ptm->tm_min,
108 &end) >= 1) {
109 } else
110 /* HHMM[.SS] */
111 if (len == 4 && sscanf(date_str, "%2u%2u%2u""%2u%2u%c" + 9,
112 &ptm->tm_hour,
113 &ptm->tm_min,
114 &end) >= 2) {
115 } else
116 /* ddHHMM[.SS] */
117 if (len == 6 && sscanf(date_str, "%2u%2u""%2u%2u%2u%c" + 6,
118 &ptm->tm_mday,
119 &ptm->tm_hour,
120 &ptm->tm_min,
121 &end) >= 3) {
122 } else
123 /* mmddHHMM[.SS] */
124 if (len == 8 && sscanf(date_str, "%2u""%2u%2u%2u%2u%c" + 3,
125 &ptm->tm_mon,
126 &ptm->tm_mday,
127 &ptm->tm_hour,
128 &ptm->tm_min,
129 &end) >= 4) {
130 /* Adjust month from 1-12 to 0-11 */
131 ptm->tm_mon -= 1;
132 } else
133 /* yymmddHHMM[.SS] */
134 if (len == 10 && sscanf(date_str, "%2u%2u%2u%2u%2u%c",
135 &ptm->tm_year,
136 &ptm->tm_mon,
137 &ptm->tm_mday,
138 &ptm->tm_hour,
139 &ptm->tm_min,
140 &end) >= 5) {
141 /* Adjust month from 1-12 to 0-11 */
142 ptm->tm_mon -= 1;
143 if ((int)cur_year >= 50) { /* >= 1950 */
144 /* Adjust year: */
145 /* 1. Put it in the current century */
146 ptm->tm_year += (cur_year / 100) * 100;
147 /* 2. If too far in the past, +100 years */
148 if (ptm->tm_year < cur_year - 50)
149 ptm->tm_year += 100;
150 /* 3. If too far in the future, -100 years */
151 if (ptm->tm_year > cur_year + 50)
152 ptm->tm_year -= 100;
153 }
154 } else
155 /* ccyymmddHHMM[.SS] */
156 if (len == 12 && sscanf(date_str, "%4u%2u%2u%2u%2u%c",
157 &ptm->tm_year,
158 &ptm->tm_mon,
159 &ptm->tm_mday,
160 &ptm->tm_hour,
161 &ptm->tm_min,
162 &end) >= 5) {
163 ptm->tm_year -= 1900; /* Adjust years */
164 ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
165 } else {
166 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
167 }
168 if (end == '.') {
169 /* xxx.SS */
170 if (sscanf(strchr(date_str, '.') + 1, "%u%c",
171 &ptm->tm_sec, &end) == 1)
172 end = '\0';
173 /* else end != NUL and we error out */
174 }
175 }
176 if (end != '\0') {
177 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
178 }
179}
180
181time_t FAST_FUNC validate_tm_time(const char *date_str, struct tm *ptm)
182{
183 time_t t = mktime(ptm);
184 if (t == (time_t) -1L) {
185 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
186 }
187 return t;
188}
189
190#if ENABLE_MONOTONIC_SYSCALL
191
192#include <sys/syscall.h>
193/* Old glibc (< 2.3.4) does not provide this constant. We use syscall
194 * directly so this definition is safe. */
195#ifndef CLOCK_MONOTONIC
196#define CLOCK_MONOTONIC 1
197#endif
198
199/* libc has incredibly messy way of doing this,
200 * typically requiring -lrt. We just skip all this mess */
201static void get_mono(struct timespec *ts)
202{
203 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, ts))
204 bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
205}
206unsigned long long FAST_FUNC monotonic_ns(void)
207{
208 struct timespec ts;
209 get_mono(&ts);
210 return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
211}
212unsigned long long FAST_FUNC monotonic_us(void)
213{
214 struct timespec ts;
215 get_mono(&ts);
216 return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
217}
218unsigned long long FAST_FUNC monotonic_ms(void)
219{
220 struct timespec ts;
221 get_mono(&ts);
222 return ts.tv_sec * 1000ULL + ts.tv_nsec/1000000;
223}
224unsigned FAST_FUNC monotonic_sec(void)
225{
226 struct timespec ts;
227 get_mono(&ts);
228 return ts.tv_sec;
229}
230
231#else
232
233unsigned long long FAST_FUNC monotonic_ns(void)
234{
235 struct timeval tv;
236 gettimeofday(&tv, NULL);
237 return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
238}
239unsigned long long FAST_FUNC monotonic_us(void)
240{
241 struct timeval tv;
242 gettimeofday(&tv, NULL);
243 return tv.tv_sec * 1000000ULL + tv.tv_usec;
244}
245unsigned long long FAST_FUNC monotonic_ms(void)
246{
247 struct timeval tv;
248 gettimeofday(&tv, NULL);
249 return tv.tv_sec * 1000ULL + tv.tv_usec / 1000;
250}
251unsigned FAST_FUNC monotonic_sec(void)
252{
253 return time(NULL);
254}
255
256#endif
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