aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--toys/date.c97
1 files changed, 50 insertions, 47 deletions
diff --git a/toys/date.c b/toys/date.c
index 7881f464..925565a2 100644
--- a/toys/date.c
+++ b/toys/date.c
@@ -12,77 +12,80 @@ config DATE
bool "date"
default y
help
- usage: date [-u] [+format] | mmddhhmm[[cc]yy]
+ usage: date [-u] [-r file] [+format] | mmddhhmm[[cc]yy]
Set/get the current date/time
*/
#include "toys.h"
-/* Convert a string of decimal numbers to their integer equivalent */
-static int fromdec(const char *buf, int len)
-{
- int result = 0;
- while (len--) result=result * 10 + (*buf++ - '0');
- return result;
-}
+DEFINE_GLOBALS(
+ char *file;
+)
+
+#define TT this.date
+
+#define FLAG_u 1
+#define FLAG_r 2
void date_main(void)
{
const char *format_string = "%a %b %e %H:%M:%S %Z %Y";
+ time_t now = time(NULL);
+ struct tm tm;
- /* Check if we should be displaying the date */
- if (!toys.optargs[0] || toys.optargs[0][0] == '+') {
- time_t now = time(NULL);
- struct tm *tm;
+ if (TT.file) {
+ struct stat st;
+
+ xstat(TT.file, &st);
+ now = st.st_mtim.tv_sec;
+ }
+ ((toys.optflags & FLAG_u) ? gmtime_r : localtime_r)(&now, &tm);
+ // Display the date?
+ if (!toys.optargs[0] || toys.optargs[0][0] == '+') {
if (toys.optargs[0]) format_string = toys.optargs[0]+1;
- if (toys.optflags) tm = gmtime(&now);
- else tm = localtime(&now);
- if (!tm) perror_msg("Unable to retrieve current time");
- if (!strftime(toybuf, sizeof(toybuf), format_string, tm))
+ if (!strftime(toybuf, sizeof(toybuf), format_string, &tm))
perror_msg("bad format `%s'", format_string);
+
puts(toybuf);
+
+ // Set the date
} else {
- int len = strlen(toys.optargs[0]);
- struct tm tm;
struct timeval tv;
+ char *s = *toys.optargs;
+ int len = strlen(s);
+
+ if (len < 8 || len > 12 || (len & 1)) error_msg("bad date `%s'", s);
- if (len < 8 || len > 12 || len & 1)
- error_msg("bad date `%s'", toys.optargs[0]);
+ // Date format: mmddhhmm[[cc]yy]
memset(&tm, 0, sizeof(tm));
- /* Date format: mmddhhmm[[cc]yy] */
- tm.tm_mon = fromdec(toys.optargs[0], 2) - 1;
- tm.tm_mday = fromdec(&toys.optargs[0][2], 2);
- tm.tm_hour = fromdec(&toys.optargs[0][4], 2);
- tm.tm_min = fromdec(&toys.optargs[0][6], 2);
- if (len == 12) tm.tm_year = fromdec(&toys.optargs[0][8], 4) - 1900;
- else if (len == 10) {
- tm.tm_year = fromdec(&toys.optargs[0][8], 2);
+ len = sscanf(s, "%2u%2u%2u%2u", &tm.tm_mon, &tm.tm_mday, &tm.tm_hour,
+ &tm.tm_min);
+ tm.tm_mon--;
+
+ // If year specified, overwrite one we fetched earlier
+ if (len > 8) {
+ sscanf(s, "%u", &tm.tm_year);
+ if (len == 12) tm.tm_year -= 1900;
/* 69-99 = 1969-1999, 0 - 68 = 2000-2068 */
- if (tm.tm_year < 69) tm.tm_year += 100;
- } else {
- /* Year not specified, so retrieve current year */
- time_t now = time(NULL);
- struct tm *now_tm = localtime(&now);
- if (!now_tm) perror_msg("Unable to retrieve current time");
- tm.tm_year = now_tm->tm_year;
+ else if (tm.tm_year < 69) tm.tm_year += 100;
}
- if (!toys.optflags) tv.tv_sec = mktime(&tm);
- else {
- /* Get the UTC version of a struct tm */
- char *tz = NULL;
- tz = getenv("TZ");
- setenv("TZ", "", 1);
+
+ if (toys.optflags & FLAG_u) {
+ // Get the UTC version of a struct tm
+ char *tz = CFG_TOYBOX_FREE ? getenv("TZ") : 0;
+ setenv("TZ", "UTC", 1);
tzset();
tv.tv_sec = mktime(&tm);
- if (tz) setenv("TZ", tz, 1);
- else unsetenv("TZ");
- tzset();
- }
+ if (CFG_TOYBOX_FREE) {
+ if (tz) setenv("TZ", tz, 1);
+ else unsetenv("TZ");
+ tzset();
+ }
+ } else tv.tv_sec = mktime(&tm);
- if (tv.tv_sec == (time_t)-1)
- error_msg("bad `%s'", toys.optargs[0]);
+ if (tv.tv_sec == (time_t)-1) error_msg("bad `%s'", toys.optargs[0]);
tv.tv_usec = 0;
if (!strftime(toybuf, sizeof(toybuf), format_string, &tm))
perror_msg("bad format `%s'", format_string);