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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
static time_t my_mktime(struct tm *tm)
{
static const int mdays[] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
int year = tm->tm_year - 70;
int month = tm->tm_mon;
int day = tm->tm_mday;
if (year < 0 || year > 129) /* algo only works for 1970-2099 */
return -1;
if (month < 0 || month > 11) /* array bounds */
return -1;
if (month < 2 || (year + 2) % 4)
day--;
return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
}
static const char *month_names[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static const char *weekday_names[] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static char *skipfws(char *str)
{
while (isspace(*str))
str++;
return str;
}
/* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
(i.e. English) day/month names, and it doesn't work correctly with %z. */
void parse_date(char *date, char *result, int maxlen)
{
struct tm tm;
char *p, *tz;
int i, offset;
time_t then;
memset(&tm, 0, sizeof(tm));
/* Skip day-name */
p = skipfws(date);
if (!isdigit(*p)) {
for (i=0; i<7; i++) {
if (!strncmp(p,weekday_names[i],3) && p[3] == ',') {
p = skipfws(p+4);
goto day;
}
}
return;
}
/* day */
day:
tm.tm_mday = strtoul(p, &p, 10);
if (tm.tm_mday < 1 || tm.tm_mday > 31)
return;
if (!isspace(*p))
return;
p = skipfws(p);
/* month */
for (i=0; i<12; i++) {
if (!strncmp(p, month_names[i], 3) && isspace(p[3])) {
tm.tm_mon = i;
p = skipfws(p+strlen(month_names[i]));
goto year;
}
}
return; /* Error -- bad month */
/* year */
year:
tm.tm_year = strtoul(p, &p, 10);
if (!tm.tm_year && !isspace(*p))
return;
if (tm.tm_year > 1900)
tm.tm_year -= 1900;
p=skipfws(p);
/* hour */
if (!isdigit(*p))
return;
tm.tm_hour = strtoul(p, &p, 10);
if (tm.tm_hour > 23)
return;
if (*p != ':')
return; /* Error -- bad time */
p++;
/* minute */
if (!isdigit(*p))
return;
tm.tm_min = strtoul(p, &p, 10);
if (tm.tm_min > 59)
return;
if (*p != ':')
goto zone;
p++;
/* second */
if (!isdigit(*p))
return;
tm.tm_sec = strtoul(p, &p, 10);
if (tm.tm_sec > 60)
return;
zone:
if (!isspace(*p))
return;
p = skipfws(p);
if (*p == '-')
offset = -60;
else if (*p == '+')
offset = 60;
else
return;
if (!isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3]) || !isdigit(p[4]))
return;
tz = p;
i = strtoul(p+1, NULL, 10);
offset *= ((i % 100) + ((i / 100) * 60));
p = skipfws(p + 5);
if (*p && *p != '(') /* trailing comment like (EDT) is ok */
return;
then = my_mktime(&tm); /* mktime uses local timezone */
if (then == -1)
return;
then -= offset;
snprintf(result, maxlen, "%lu %5.5s", then, tz);
}
void datestamp(char *buf, int bufsize)
{
time_t now;
int offset;
time(&now);
offset = my_mktime(localtime(&now)) - now;
offset /= 60;
snprintf(buf, bufsize, "%lu %+05d", now, offset/60*100 + offset%60);
}
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