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/* Routines for formatting time
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#define MINUTE 60
#define HOUR (60*MINUTE)
#define DAY (24*HOUR)
#define WEEK (7*DAY)
#define MONTH (31*DAY) /* Not strictly accurate, but oh well. */
#define YEAR (365*DAY) /* ditto */
/* XXX move this somewhere else. */
int
fmt_frac_value (int value, unsigned min_value_len,
unsigned frac, unsigned frac_scale,
unsigned width, char *buf, unsigned buf_len)
{
unsigned value_len;
unsigned frac_len;
unsigned len = 0;
if (value >= 100) /* the integer part */
value_len = 3;
else if (value >= 10)
value_len = 2;
else
value_len = 1;
while (value_len < min_value_len-- && len < buf_len)
*buf++ = '0', len++;
for (frac_len = frac_scale
; frac_len > 0 && (width < value_len + 1 + frac_len || frac % 10 == 0)
; frac_len--)
frac /= 10;
if (frac_len > 0)
len +=
snprintf (buf + len, buf_len - len, "%d.%0*d", value, frac_len, frac);
else
len += snprintf (buf + len, buf_len - len, "%d", value);
return len;
}
/* Returns the number of digits in the integer N. */
static unsigned
int_len (unsigned n)
{
unsigned len = 1;
while (n >= 10)
{
n /= 10;
len++;
}
return len;
}
/* Returns TV1 divided by TV2. */
static unsigned
tv_div (struct timeval *tv1, struct timeval *tv2)
{
return
tv2->tv_sec
? tv1->tv_sec / tv2->tv_sec
: (tv1->tv_usec / tv2->tv_usec
+ (tv1->tv_sec ? tv1->tv_sec * 1000000 / tv2->tv_usec : 0));
}
/* Format into BUF & BUF_LEN the time interval represented by TV, trying to
make the result less than WIDTH characters wide. The number of characters
used is returned. */
int
fmt_named_interval (struct timeval *tv, int width, char *buf, unsigned buf_len)
{
struct tscale
{
struct timeval thresh; /* Minimum time to use this scale. */
struct timeval unit; /* Unit this scale is based on. */
int fracs; /* Allow a single fraction digit? */
char *sfxs[5]; /* Names to use, in descending length. */
}
time_scales[] =
{
{ {2*YEAR, 0}, {YEAR, 0}, 0, { " years", "years", "yrs", "y", 0 }},
{ {3*MONTH, 0}, {MONTH, 0}, 0, { " months", "months", "mo", 0 }},
{ {2*WEEK, 0}, {WEEK, 0}, 0, { " weeks", "weeks", "wks", "w", 0 }},
{ {2*DAY, 0}, {DAY, 0}, 0, { " days", "days", "dys", "d", 0 }},
{ {2*HOUR, 0}, {HOUR, 0}, 0, { " hours", "hours", "hrs", "h", 0 }},
{ {2*MINUTE, 0}, {MINUTE, 0},0, { " minutes", "min", "mi", "m", 0 }},
{ {1, 100000}, {1, 0}, 1, { " seconds", "sec", "s", 0 }},
{ {1, 0}, {1, 0}, 0, { " second", "sec", "s", 0 }},
{ {0, 1100}, {0, 1000}, 1, { " milliseconds", "ms", 0 }},
{ {0, 1000}, {0, 1000}, 0, { " millisecond", "ms", 0 }},
{ {0, 2}, {0, 1}, 0, { " microseconds", "us", 0 }},
{ {0, 1}, {0, 1}, 0, { " microsecond", "us", 0 }},
{ {0, 0} }
};
struct tscale *ts = time_scales;
if (width <= 0 || width >= buf_len)
width = buf_len - 1;
for (ts = time_scales; ts->thresh.tv_sec > 0 || ts->thresh.tv_usec > 0; ts++)
if (tv->tv_sec > ts->thresh.tv_sec
|| (tv->tv_sec == ts->thresh.tv_sec
&& tv->tv_usec >= ts->thresh.tv_usec))
{
char **sfx;
struct timeval *u = &ts->unit;
unsigned num = tv_div (tv, u);
unsigned frac = 0;
unsigned num_len = int_len (num);
if (ts->fracs && num == 1)
/* Calculate another place of prec, but only for low numbers. */
{
/* TV times 10. */
struct timeval tv10 =
{ tv->tv_sec * 10 + tv->tv_usec / 100000,
(tv->tv_usec % 100000) * 10 };
frac = tv_div (&tv10, u) - num * 10;
if (frac)
num_len += 2; /* Account for the extra `.' + DIGIT. */
}
/* While we have a choice, find a suffxi that fits in WIDTH. */
for (sfx = ts->sfxs; sfx[1]; sfx++)
if (num_len + strlen (*sfx) <= width)
break;
if (frac)
return snprintf (buf, buf_len, "%d.%d%s", num, frac, *sfx);
else
return snprintf (buf, buf_len, "%d%s", num, *sfx);
}
return sprintf (buf, "0"); /* Whatever */
}
static int
append_fraction (int frac, int digits, char *buf, unsigned max)
{
int slen = strlen (buf);
int left = max - slen;
if (left > 1)
{
buf[slen] = '.';
left--;
while (digits > left)
frac /= 10, digits--;
sprintf (buf + slen + 1, "%0*d", digits, frac);
return slen + 1 + digits;
}
else
return slen;
}
/* Format into BUF & BUF_LEN the time interval represented by TV, using
HH:MM:SS notation where possible, and trying to make the result less than
WIDTH characters wide. The number of characters used is returned. */
int
fmt_seconds (struct timeval *tv, unsigned width, char *buf, unsigned buf_len)
{
if (width <= 0 || width >= buf_len)
width = buf_len - 1;
if (tv->tv_sec > DAY)
return fmt_named_interval (tv, width, buf, buf_len);
if (tv->tv_sec > HOUR)
if (width >= 8)
/* H:MM:SS.ss... */
return snprintf (buf, buf_len, "%2d:%02d:%02d",
tv->tv_sec / HOUR,
(tv->tv_sec % HOUR) / MINUTE, (tv->tv_sec % MINUTE))
+ append_fraction (tv->tv_usec, 6, buf, width);
else
return fmt_named_interval (tv, width, buf, buf_len);
else if (width >= 5 || tv->tv_sec > MINUTE)
/* M:SS.ss... */
return snprintf (buf, buf_len, "%2d:%02d",
tv->tv_sec / MINUTE, tv->tv_sec % MINUTE)
+ append_fraction (tv->tv_usec, 6, buf, width);
else
return fmt_frac_value (tv->tv_sec, 1, tv->tv_usec, 6, width, buf, buf_len);
}
/* Format into BUF & BUF_LEN the time interval represented by TV, using
HH:MM notation where possible, and trying to make the result less than
WIDTH characters wide. The number of characters used is returned. */
int
fmt_minutes (struct timeval *tv, int width, char *buf, unsigned buf_len)
{
if (width <= 0 || width >= buf_len)
width = buf_len - 1;
if (tv->tv_sec > DAY)
return fmt_named_interval (tv, width, buf, buf_len);
if (width >= 8)
/* H:MM:SS.ss... */
return snprintf (buf, buf_len, "%2d:%02d:%02d",
tv->tv_sec / HOUR,
(tv->tv_sec % HOUR) / MINUTE, (tv->tv_sec % MINUTE))
+ append_fraction (tv->tv_usec, 6, buf, width);
else if (width >= 5 || (width >= 4 && tv->tv_sec < 10 * HOUR))
/* H:MM */
return sprintf (buf, "%2d:%02d",
tv->tv_sec / HOUR, (tv->tv_sec % HOUR) / MINUTE);
else if ((tv->tv_sec >= 100 * MINUTE && width < 3) || tv->tv_sec > 3 * HOUR)
/* H: */
return snprintf (buf, buf_len, "%2d:", tv->tv_sec / HOUR);
else
/* M */
return snprintf (buf, buf_len, "%2d", tv->tv_sec / MINUTE);
}
#if 0
int
fmt_past_time (struct timeval *tv, struct timeval *now,
int width, char *buf, unsigned buf_len)
{
struct tm tm, now_tm;
char day[10], month[10], time[20];
long diff = now->tv_sec - tv->tv_sec;
if (diff < 0)
diff = -diff; /* XXX */
bcopy (tm, localtime (&tv.tv_sec), sizeof (tm));
bcopy (now_tm, localtime (&now.tv_sec), sizeof (now_tm));
strftime (time, sizeof (time), "%r", tv);
if (tm.tm_yday != now_tm.tm_yday || tm.tm_year != now_tm.tm_year)
strftime (day, sizeof (day), "%a", tv);
if (tm.tm_mon != now_tm.tm_mon)
strftime (month, sizeof (month), "%b", tv);
}
#endif
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