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/*
* Function to generate RFC822-compliant textual time/date stamp
*/
#include "sysdep.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include "genstamp.h"
static char *months[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static char *weekdays[] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
/*
* Supplied with a unix timestamp, generate an RFC822-compliant textual
* time and date stamp.
*/
long datestring(char *buf, size_t n, time_t xtime, int which_format) {
struct tm t;
long offset;
char offsign;
localtime_r(&xtime, &t);
/* Convert "seconds west of GMT" to "hours/minutes offset" */
#ifdef HAVE_STRUCT_TM_TM_GMTOFF
offset = t.tm_gmtoff;
#else
offset = timezone;
#endif
if (offset > 0) {
offsign = '+';
}
else {
offset = 0L - offset;
offsign = '-';
}
offset = ( (offset / 3600) * 100 ) + ( offset % 60 );
switch(which_format) {
case DATESTRING_RFC822:
return snprintf(
buf, n,
"%s, %02d %s %04d %02d:%02d:%02d %c%04ld",
weekdays[t.tm_wday],
t.tm_mday,
months[t.tm_mon],
t.tm_year + 1900,
t.tm_hour,
t.tm_min,
t.tm_sec,
offsign, offset
);
break;
case DATESTRING_IMAP:
return snprintf(
buf, n,
"%02d-%s-%04d %02d:%02d:%02d %c%04ld",
t.tm_mday,
months[t.tm_mon],
t.tm_year + 1900,
t.tm_hour,
t.tm_min,
t.tm_sec,
offsign, offset
);
break;
}
return 0;
}
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