diff options
| -rw-r--r-- | libshouldbeinlibc/timefmt.c | 76 |
1 files changed, 55 insertions, 21 deletions
diff --git a/libshouldbeinlibc/timefmt.c b/libshouldbeinlibc/timefmt.c index c0805461..1ae48922 100644 --- a/libshouldbeinlibc/timefmt.c +++ b/libshouldbeinlibc/timefmt.c @@ -55,45 +55,62 @@ tv_div (struct timeval *tv1, struct timeval *tv2) : (tv1->tv_usec / tv2->tv_usec + (tv1->tv_sec ? tv1->tv_sec * 1000000 / tv2->tv_usec : 0)); } + +/* Returns true if TV is zero. */ +static inline int +tv_is_zero (struct timeval *tv) +{ + return tv->tv_sec == 0 && tv->tv_usec == 0; +} + +/* Returns true if TV1 >= TV2. */ +static inline int +tv_is_ge (struct timeval *tv1, struct timeval *tv2) +{ + return + tv1->tv_sec > tv2->tv_sec + || (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec >= tv2->tv_usec); +} /* 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. */ size_t -fmt_named_interval (struct timeval *tv, size_t width, char *buf, size_t buf_len) +fmt_named_interval (struct timeval *tv, size_t width, + char *buf, size_t 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? */ + struct timeval frac_thresh; /* If a emitting a single digit of precision + will cause at least this much error, also + emit 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} } + {{2*YEAR, 0}, {YEAR, 0}, {MONTH, 0},{" years", "years", "yrs", "y", 0 }}, + {{3*MONTH, 0}, {MONTH, 0}, {WEEK, 0}, {" months","months","mo", 0 }}, + {{2*WEEK, 0}, {WEEK, 0}, {DAY, 0}, {" weeks", "weeks", "wks", "w", 0 }}, + {{2*DAY, 0}, {DAY, 0}, {HOUR, 0}, {" days", "days", "dys", "d", 0 }}, + {{2*HOUR, 0}, {HOUR, 0}, {MINUTE, 0},{" hours","hours", "hrs", "h", 0 }}, + {{2*MINUTE, 0},{MINUTE, 0},{1, 0}, {" minutes","min", "mi", "m", 0 }}, + {{1, 100000}, {1, 0}, {0, 100000},{" seconds", "sec", "s", 0 }}, + {{1, 0}, {1, 0}, {0, 0}, {" second", "sec", "s", 0 }}, + {{0, 1100}, {0, 1000}, {0, 100}, {" milliseconds", "ms", 0 }}, + {{0, 1000}, {0, 1000}, {0, 0}, {" millisecond", "ms", 0 }}, + {{0, 2}, {0, 1}, {0, 0}, {" microseconds", "us", 0 }}, + {{0, 1}, {0, 1}, {0, 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)) + for (ts = time_scales; !tv_is_zero (&ts->thresh); ts++) + if (tv_is_ge (tv, &ts->thresh)) { char **sfx; struct timeval *u = &ts->unit; @@ -101,7 +118,9 @@ fmt_named_interval (struct timeval *tv, size_t width, char *buf, size_t buf_len) unsigned frac = 0; unsigned num_len = int_len (num); - if (ts->fracs && num == 1) + if (num < 10 + && !tv_is_zero (&ts->frac_thresh) + && tv_is_ge (tv, &ts->frac_thresh)) /* Calculate another place of prec, but only for low numbers. */ { /* TV times 10. */ @@ -113,11 +132,26 @@ fmt_named_interval (struct timeval *tv, size_t width, char *buf, size_t buf_len) num_len += 2; /* Account for the extra `.' + DIGIT. */ } - /* While we have a choice, find a suffxi that fits in WIDTH. */ + /* While we have a choice, find a suffix that fits in WIDTH. */ for (sfx = ts->sfxs; sfx[1]; sfx++) if (num_len + strlen (*sfx) <= width) break; + if (!sfx[1] && frac) + /* We couldn't find a suffix that fits, and we're printing a + fraction digit. Sacrifice the fraction to make it fit. */ + { + num_len -= 2; + frac = 0; + for (sfx = ts->sfxs; sfx[1]; sfx++) + if (num_len + strlen (*sfx) <= width) + break; + } + + if (!sfx[1]) + /* Still couldn't find a suffix that fits. Oh well, use the best. */ + sfx--; + if (frac) return snprintf (buf, buf_len, "%d.%d%s", num, frac, *sfx); else |