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authorDenys Vlasenko2009-07-18 03:40:35 +0200
committerDenys Vlasenko2009-07-18 03:40:35 +0200
commit73b71f381d24218cf6368364be723a7b5c9aeda9 (patch)
treefe3c6e1056417bbd2dc470cd5ad74daaf25542ea /libbb/time.c
parentd23f64eba79a702c36d8d8cec23b49c320897138 (diff)
downloadbusybox-73b71f381d24218cf6368364be723a7b5c9aeda9.zip
busybox-73b71f381d24218cf6368364be723a7b5c9aeda9.tar.gz
date: factor out date parsing (in preparation for touch -d)
function old new delta parse_datestr - 391 +391 sha512_process_block128 1283 1310 +27 buffer_fill_and_print 179 196 +17 nexpr 826 840 +14 unzip_main 1931 1939 +8 popstring 134 140 +6 qrealloc 33 36 +3 builtin_umask 121 123 +2 evalvar 1365 1363 -2 changepath 194 192 -2 do_compress 1698 1688 -10 hwclock_main 340 329 -11 cmdputs 414 402 -12 identify 4343 4329 -14 date_main 1186 687 -499 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 7/7 up/down: 468/-550) Total: -82 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/time.c')
-rw-r--r--libbb/time.c64
1 files changed, 63 insertions, 1 deletions
diff --git a/libbb/time.c b/libbb/time.c
index 850ac15..30b760f 100644
--- a/libbb/time.c
+++ b/libbb/time.c
@@ -6,9 +6,71 @@
*
* Licensed under GPL version 2, see file LICENSE in this tarball for details.
*/
-
#include "libbb.h"
+void FAST_FUNC parse_datestr(const char *date_str, struct tm *tm_time)
+{
+ char end = '\0';
+ const char *last_colon = strrchr(date_str, ':');
+
+ if (last_colon != NULL) {
+ /* Parse input and assign appropriately to tm_time */
+
+ if (sscanf(date_str, "%u:%u%c",
+ &tm_time->tm_hour,
+ &tm_time->tm_min,
+ &end) >= 2) {
+ /* no adjustments needed */
+ } else if (sscanf(date_str, "%u.%u-%u:%u%c",
+ &tm_time->tm_mon, &tm_time->tm_mday,
+ &tm_time->tm_hour, &tm_time->tm_min,
+ &end) >= 4) {
+ /* Adjust dates from 1-12 to 0-11 */
+ tm_time->tm_mon -= 1;
+ } else if (sscanf(date_str, "%u.%u.%u-%u:%u%c", &tm_time->tm_year,
+ &tm_time->tm_mon, &tm_time->tm_mday,
+ &tm_time->tm_hour, &tm_time->tm_min,
+ &end) >= 5) {
+ tm_time->tm_year -= 1900; /* Adjust years */
+ tm_time->tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
+ } else if (sscanf(date_str, "%u-%u-%u %u:%u%c", &tm_time->tm_year,
+ &tm_time->tm_mon, &tm_time->tm_mday,
+ &tm_time->tm_hour, &tm_time->tm_min,
+ &end) >= 5) {
+ tm_time->tm_year -= 1900; /* Adjust years */
+ tm_time->tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
+//TODO: coreutils 6.9 also accepts "YYYY-MM-DD HH" (no minutes)
+ } else {
+ bb_error_msg_and_die(bb_msg_invalid_date, date_str);
+ }
+ if (end == ':') {
+ if (sscanf(last_colon + 1, "%u%c", &tm_time->tm_sec, &end) == 1)
+ end = '\0';
+ /* else end != NUL and we error out */
+ }
+ } else {
+ if (sscanf(date_str, "%2u%2u%2u%2u%u%c", &tm_time->tm_mon,
+ &tm_time->tm_mday, &tm_time->tm_hour, &tm_time->tm_min,
+ &tm_time->tm_year, &end) < 4)
+ bb_error_msg_and_die(bb_msg_invalid_date, date_str);
+ /* correct for century - minor Y2K problem here? */
+ if (tm_time->tm_year >= 1900) {
+ tm_time->tm_year -= 1900;
+ }
+ /* adjust date */
+ tm_time->tm_mon -= 1;
+ if (end == '.') {
+ if (sscanf(strchr(date_str, '.') + 1, "%u%c",
+ &tm_time->tm_sec, &end) == 1)
+ end = '\0';
+ /* else end != NUL and we error out */
+ }
+ }
+ if (end != '\0') {
+ bb_error_msg_and_die(bb_msg_invalid_date, date_str);
+ }
+}
+
#if ENABLE_MONOTONIC_SYSCALL
#include <sys/syscall.h>