Add branch --set-upstream
[gitweb.git] / date.c
diff --git a/date.c b/date.c
index f011692c2f9f06e2356c2256ff8f1b496a1af2d5..5d05ef61cfb140f004702a5ed614afa755c50670 100644 (file)
--- a/date.c
+++ b/date.c
@@ -24,6 +24,8 @@ time_t tm_to_time_t(const struct tm *tm)
                return -1;
        if (month < 2 || (year + 2) % 4)
                day--;
+       if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_sec < 0)
+               return -1;
        return (year * 365 + (year + 1) / 4 + mdays[month] + day) * 24*60*60UL +
                tm->tm_hour * 60*60 + tm->tm_min * 60 + tm->tm_sec;
 }
@@ -84,6 +86,67 @@ static int local_tzoffset(unsigned long time)
        return offset * eastwest;
 }
 
+const char *show_date_relative(unsigned long time, int tz,
+                              const struct timeval *now,
+                              char *timebuf,
+                              size_t timebuf_size)
+{
+       unsigned long diff;
+       if (now->tv_sec < time)
+               return "in the future";
+       diff = now->tv_sec - time;
+       if (diff < 90) {
+               snprintf(timebuf, timebuf_size, "%lu seconds ago", diff);
+               return timebuf;
+       }
+       /* Turn it into minutes */
+       diff = (diff + 30) / 60;
+       if (diff < 90) {
+               snprintf(timebuf, timebuf_size, "%lu minutes ago", diff);
+               return timebuf;
+       }
+       /* Turn it into hours */
+       diff = (diff + 30) / 60;
+       if (diff < 36) {
+               snprintf(timebuf, timebuf_size, "%lu hours ago", diff);
+               return timebuf;
+       }
+       /* We deal with number of days from here on */
+       diff = (diff + 12) / 24;
+       if (diff < 14) {
+               snprintf(timebuf, timebuf_size, "%lu days ago", diff);
+               return timebuf;
+       }
+       /* Say weeks for the past 10 weeks or so */
+       if (diff < 70) {
+               snprintf(timebuf, timebuf_size, "%lu weeks ago", (diff + 3) / 7);
+               return timebuf;
+       }
+       /* Say months for the past 12 months or so */
+       if (diff < 365) {
+               snprintf(timebuf, timebuf_size, "%lu months ago", (diff + 15) / 30);
+               return timebuf;
+       }
+       /* Give years and months for 5 years or so */
+       if (diff < 1825) {
+               unsigned long years = diff / 365;
+               unsigned long months = (diff % 365 + 15) / 30;
+               int n;
+               n = snprintf(timebuf, timebuf_size, "%lu year%s",
+                               years, (years > 1 ? "s" : ""));
+               if (months)
+                       snprintf(timebuf + n, timebuf_size - n,
+                                       ", %lu month%s ago",
+                                       months, (months > 1 ? "s" : ""));
+               else
+                       snprintf(timebuf + n, timebuf_size - n, " ago");
+               return timebuf;
+       }
+       /* Otherwise, just years. Centuries is probably overkill. */
+       snprintf(timebuf, timebuf_size, "%lu years ago", (diff + 183) / 365);
+       return timebuf;
+}
+
 const char *show_date(unsigned long time, int tz, enum date_mode mode)
 {
        struct tm *tm;
@@ -95,63 +158,10 @@ const char *show_date(unsigned long time, int tz, enum date_mode mode)
        }
 
        if (mode == DATE_RELATIVE) {
-               unsigned long diff;
                struct timeval now;
                gettimeofday(&now, NULL);
-               if (now.tv_sec < time)
-                       return "in the future";
-               diff = now.tv_sec - time;
-               if (diff < 90) {
-                       snprintf(timebuf, sizeof(timebuf), "%lu seconds ago", diff);
-                       return timebuf;
-               }
-               /* Turn it into minutes */
-               diff = (diff + 30) / 60;
-               if (diff < 90) {
-                       snprintf(timebuf, sizeof(timebuf), "%lu minutes ago", diff);
-                       return timebuf;
-               }
-               /* Turn it into hours */
-               diff = (diff + 30) / 60;
-               if (diff < 36) {
-                       snprintf(timebuf, sizeof(timebuf), "%lu hours ago", diff);
-                       return timebuf;
-               }
-               /* We deal with number of days from here on */
-               diff = (diff + 12) / 24;
-               if (diff < 14) {
-                       snprintf(timebuf, sizeof(timebuf), "%lu days ago", diff);
-                       return timebuf;
-               }
-               /* Say weeks for the past 10 weeks or so */
-               if (diff < 70) {
-                       snprintf(timebuf, sizeof(timebuf), "%lu weeks ago", (diff + 3) / 7);
-                       return timebuf;
-               }
-               /* Say months for the past 12 months or so */
-               if (diff < 360) {
-                       snprintf(timebuf, sizeof(timebuf), "%lu months ago", (diff + 15) / 30);
-                       return timebuf;
-               }
-               /* Give years and months for 5 years or so */
-               if (diff < 1825) {
-                       unsigned long years = diff / 365;
-                       unsigned long months = (diff % 365 + 15) / 30;
-                       int n;
-                       n = snprintf(timebuf, sizeof(timebuf), "%lu year%s",
-                                       years, (years > 1 ? "s" : ""));
-                       if (months)
-                               snprintf(timebuf + n, sizeof(timebuf) - n,
-                                       ", %lu month%s ago",
-                                       months, (months > 1 ? "s" : ""));
-                       else
-                               snprintf(timebuf + n, sizeof(timebuf) - n,
-                                       " ago");
-                       return timebuf;
-               }
-               /* Otherwise, just years. Centuries is probably overkill. */
-               snprintf(timebuf, sizeof(timebuf), "%lu years ago", (diff + 183) / 365);
-               return timebuf;
+               return show_date_relative(time, tz, &now,
+                                         timebuf, sizeof(timebuf));
        }
 
        if (mode == DATE_LOCAL)
@@ -425,13 +435,19 @@ static int match_multi_number(unsigned long num, char c, const char *date, char
        return end - date;
 }
 
-/* Have we filled in any part of the time/date yet? */
+/*
+ * Have we filled in any part of the time/date yet?
+ * We just do a binary 'and' to see if the sign bit
+ * is set in all the values.
+ */
 static inline int nodate(struct tm *tm)
 {
-       return tm->tm_year < 0 &&
-               tm->tm_mon < 0 &&
-               tm->tm_mday < 0 &&
-               !(tm->tm_hour | tm->tm_min | tm->tm_sec);
+       return (tm->tm_year &
+               tm->tm_mon &
+               tm->tm_mday &
+               tm->tm_hour &
+               tm->tm_min &
+               tm->tm_sec) < 0;
 }
 
 /*
@@ -525,11 +541,8 @@ static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt
                }
        }
 
-       if (num > 0 && num < 32) {
-               tm->tm_mday = num;
-       } else if (num > 0 && num < 13) {
+       if (num > 0 && num < 13 && tm->tm_mon < 0)
                tm->tm_mon = num-1;
-       }
 
        return n;
 }
@@ -583,6 +596,9 @@ int parse_date(const char *date, char *result, int maxlen)
        tm.tm_mon = -1;
        tm.tm_mday = -1;
        tm.tm_isdst = -1;
+       tm.tm_hour = -1;
+       tm.tm_min = -1;
+       tm.tm_sec = -1;
        offset = -1;
        tm_gmt = 0;
 
@@ -657,42 +673,59 @@ void datestamp(char *buf, int bufsize)
        date_string(now, offset, buf, bufsize);
 }
 
-static void update_tm(struct tm *tm, unsigned long sec)
+/*
+ * Relative time update (eg "2 days ago").  If we haven't set the time
+ * yet, we need to set it from current time.
+ */
+static unsigned long update_tm(struct tm *tm, struct tm *now, unsigned long sec)
 {
-       time_t n = mktime(tm) - sec;
+       time_t n;
+
+       if (tm->tm_mday < 0)
+               tm->tm_mday = now->tm_mday;
+       if (tm->tm_mon < 0)
+               tm->tm_mon = now->tm_mon;
+       if (tm->tm_year < 0) {
+               tm->tm_year = now->tm_year;
+               if (tm->tm_mon > now->tm_mon)
+                       tm->tm_year--;
+       }
+
+       n = mktime(tm) - sec;
        localtime_r(&n, tm);
+       return n;
 }
 
-static void date_yesterday(struct tm *tm, int *num)
+static void date_yesterday(struct tm *tm, struct tm *now, int *num)
 {
-       update_tm(tm, 24*60*60);
+       update_tm(tm, now, 24*60*60);
 }
 
-static void date_time(struct tm *tm, int hour)
+static void date_time(struct tm *tm, struct tm *now, int hour)
 {
        if (tm->tm_hour < hour)
-               date_yesterday(tm, NULL);
+               date_yesterday(tm, now, NULL);
        tm->tm_hour = hour;
        tm->tm_min = 0;
        tm->tm_sec = 0;
 }
 
-static void date_midnight(struct tm *tm, int *num)
+static void date_midnight(struct tm *tm, struct tm *now, int *num)
 {
-       date_time(tm, 0);
+       date_time(tm, now, 0);
 }
 
-static void date_noon(struct tm *tm, int *num)
+static void date_noon(struct tm *tm, struct tm *now, int *num)
 {
-       date_time(tm, 12);
+       date_time(tm, now, 12);
 }
 
-static void date_tea(struct tm *tm, int *num)
+static void date_tea(struct tm *tm, struct tm *now, int *num)
 {
-       date_time(tm, 17);
+       date_time(tm, now, 17);
 }
 
-static void date_pm(struct tm *tm, int *num)
+static void date_pm(struct tm *tm, struct tm *now, int *num)
 {
        int hour, n = *num;
        *num = 0;
@@ -706,7 +739,7 @@ static void date_pm(struct tm *tm, int *num)
        tm->tm_hour = (hour % 12) + 12;
 }
 
-static void date_am(struct tm *tm, int *num)
+static void date_am(struct tm *tm, struct tm *now, int *num)
 {
        int hour, n = *num;
        *num = 0;
@@ -720,7 +753,7 @@ static void date_am(struct tm *tm, int *num)
        tm->tm_hour = (hour % 12);
 }
 
-static void date_never(struct tm *tm, int *num)
+static void date_never(struct tm *tm, struct tm *now, int *num)
 {
        time_t n = 0;
        localtime_r(&n, tm);
@@ -728,7 +761,7 @@ static void date_never(struct tm *tm, int *num)
 
 static const struct special {
        const char *name;
-       void (*fn)(struct tm *, int *);
+       void (*fn)(struct tm *, struct tm *, int *);
 } special[] = {
        { "yesterday", date_yesterday },
        { "noon", date_noon },
@@ -757,7 +790,7 @@ static const struct typelen {
        { NULL }
 };
 
-static const char *approxidate_alpha(const char *date, struct tm *tm, int *num)
+static const char *approxidate_alpha(const char *date, struct tm *tm, struct tm *now, int *num)
 {
        const struct typelen *tl;
        const struct special *s;
@@ -778,7 +811,7 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num)
        for (s = special; s->name; s++) {
                int len = strlen(s->name);
                if (match_string(date, s->name) == len) {
-                       s->fn(tm, num);
+                       s->fn(tm, now, num);
                        return end;
                }
        }
@@ -800,7 +833,7 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num)
        while (tl->type) {
                int len = strlen(tl->type);
                if (match_string(date, tl->type) >= len-1) {
-                       update_tm(tm, tl->length * *num);
+                       update_tm(tm, now, tl->length * *num);
                        *num = 0;
                        return end;
                }
@@ -818,13 +851,15 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num)
                                n++;
                        diff += 7*n;
 
-                       update_tm(tm, diff * 24 * 60 * 60);
+                       update_tm(tm, now, diff * 24 * 60 * 60);
                        return end;
                }
        }
 
        if (match_string(date, "months") >= 5) {
-               int n = tm->tm_mon - *num;
+               int n;
+               update_tm(tm, now, 0); /* fill in date fields if needed */
+               n = tm->tm_mon - *num;
                *num = 0;
                while (n < 0) {
                        n += 12;
@@ -835,6 +870,7 @@ static const char *approxidate_alpha(const char *date, struct tm *tm, int *num)
        }
 
        if (match_string(date, "years") >= 4) {
+               update_tm(tm, now, 0); /* fill in date fields if needed */
                tm->tm_year -= *num;
                *num = 0;
                return end;
@@ -866,36 +902,82 @@ static const char *approxidate_digit(const char *date, struct tm *tm, int *num)
        return end;
 }
 
-unsigned long approxidate(const char *date)
+/*
+ * Do we have a pending number at the end, or when
+ * we see a new one? Let's assume it's a month day,
+ * as in "Dec 6, 1992"
+ */
+static void pending_number(struct tm *tm, int *num)
+{
+       int number = *num;
+
+       if (number) {
+               *num = 0;
+               if (tm->tm_mday < 0 && number < 32)
+                       tm->tm_mday = number;
+               else if (tm->tm_mon < 0 && number < 13)
+                       tm->tm_mon = number-1;
+               else if (tm->tm_year < 0) {
+                       if (number > 1969 && number < 2100)
+                               tm->tm_year = number - 1900;
+                       else if (number > 69 && number < 100)
+                               tm->tm_year = number;
+                       else if (number < 38)
+                               tm->tm_year = 100 + number;
+                       /* We screw up for number = 00 ? */
+               }
+       }
+}
+
+static unsigned long approxidate_str(const char *date, const struct timeval *tv)
 {
        int number = 0;
        struct tm tm, now;
-       struct timeval tv;
        time_t time_sec;
-       char buffer[50];
-
-       if (parse_date(date, buffer, sizeof(buffer)) > 0)
-               return strtoul(buffer, NULL, 10);
 
-       gettimeofday(&tv, NULL);
-       time_sec = tv.tv_sec;
+       time_sec = tv->tv_sec;
        localtime_r(&time_sec, &tm);
        now = tm;
+
+       tm.tm_year = -1;
+       tm.tm_mon = -1;
+       tm.tm_mday = -1;
+
        for (;;) {
                unsigned char c = *date;
                if (!c)
                        break;
                date++;
                if (isdigit(c)) {
+                       pending_number(&tm, &number);
                        date = approxidate_digit(date-1, &tm, &number);
                        continue;
                }
                if (isalpha(c))
-                       date = approxidate_alpha(date-1, &tm, &number);
+                       date = approxidate_alpha(date-1, &tm, &now, &number);
        }
-       if (number > 0 && number < 32)
-               tm.tm_mday = number;
-       if (tm.tm_mon > now.tm_mon && tm.tm_year == now.tm_year)
-               tm.tm_year--;
-       return mktime(&tm);
+       pending_number(&tm, &number);
+       return update_tm(&tm, &now, 0);
+}
+
+unsigned long approxidate_relative(const char *date, const struct timeval *tv)
+{
+       char buffer[50];
+
+       if (parse_date(date, buffer, sizeof(buffer)) > 0)
+               return strtoul(buffer, NULL, 0);
+
+       return approxidate_str(date, tv);
+}
+
+unsigned long approxidate(const char *date)
+{
+       struct timeval tv;
+       char buffer[50];
+
+       if (parse_date(date, buffer, sizeof(buffer)) > 0)
+               return strtoul(buffer, NULL, 0);
+
+       gettimeofday(&tv, NULL);
+       return approxidate_str(date, &tv);
 }