Mercurial > hg > octave-kai > gnulib-hg
changeset 546:baaeb11e50e5
(add_num_tz): New function.
(strftime): Handle new %z format.
From H. Peter Anvin (hpa@storm.net).
Don't use local, LENGTH, before it's defined.
author | Jim Meyering <jim@meyering.net> |
---|---|
date | Thu, 01 Feb 1996 05:40:32 +0000 |
parents | fa12689ca23d |
children | 74d07072760e |
files | lib/strftime.c |
diffstat | 1 files changed, 61 insertions(+), 0 deletions(-) [+] |
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--- a/lib/strftime.c +++ b/lib/strftime.c @@ -50,6 +50,7 @@ %S second (00..61) %T time, 24-hour (hh:mm:ss) %X locale's time representation (%H:%M:%S) + %z RFC-822 style numeric timezone (-0500) (a nonstandard extension) %Z time zone (EDT), or nothing if no time zone is determinable Date fields: @@ -203,6 +204,35 @@ return length; } +/* Convert MINUTES_EAST into a string suitable for use as the RFC-822 + timezone indicator. Write no more than MAX bytes into STRING. + Return the number of bytes written into STRING. */ + +static int +add_num_tz (string, max, minutes_east) + char *string; + int max; + int minutes_east; +{ + int length; + + if (max < 1) + return 0; + + if (minutes_east < 0) + { + *string = '-'; + minutes_east = -minutes_east; + } + else + *string = '+'; + + length = 1 + add_num2 (&string[1], (minutes_east / 60) % 24, max - 1, zero); + length += add_num2 (&string[length], minutes_east % 60, max - length, zero); + + return length; +} + /* Return the week in the year of the time in TM, with the weeks starting on Sundays. */ @@ -370,6 +400,37 @@ length += strftime (&string[length], max - length, "%H:%M:%S", tm); break; + case 'z': + { + time_t t; + struct tm tml, tmg; + int diff; + + tml = *tm; + t = mktime (&tml); + tml = *localtime (&t); /* Canonicalize the local time */ + tmg = *gmtime (&t); + + /* Compute the difference */ + + diff = tml.tm_min - tmg.tm_min; + diff += 60 * (tml.tm_hour - tmg.tm_hour); + + if (tml.tm_mon != tmg.tm_mon) + { + /* We assume no timezone differs from UTC by more than + +- 23 hours. This should be safe. */ + if (tmg.tm_mday == 1) + tml.tm_mday = 0; + else /* tml.tm_mday == 1 */ + tmg.tm_mday = 0; + } + + diff += 1440 * (tml.tm_mday - tmg.tm_mday); + + length += add_num_tz (&string[length], max - length, diff); + } + break; case 'Z': #ifdef HAVE_TM_ZONE length += add_str (&string[length], tm->tm_zone, max - length);