4e9d2f6a5b
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@14325 ec53bebd-3082-4978-b11e-865c3cabbd6b
174 lines
4.9 KiB
Groff
174 lines
4.9 KiB
Groff
.\" Copyright (c) 2004 Kungliga Tekniska Högskolan
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.\" (Royal Institute of Technology, Stockholm, Sweden).
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" 3. Neither the name of the Institute nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\" $Id$
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.\"
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.Dd October 31, 2004
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.Dt PARSE_TIME 3
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.Os HEIMDAL
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.Sh NAME
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.Nm parse_time ,
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.Nm print_time_table ,
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.Nm unparse_time ,
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.Nm unparse_time_approx ,
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.Nd parse and unparse time intervals
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.Sh LIBRARY
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The roken library (libroken, -lroken)
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.Sh SYNOPSIS
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.Fd #include <parse_time.h>
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.Ft int
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.Fn parse_time "const char *timespec" "const char *def_unit"
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.Ft void
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.Fn print_time_table "FILE *f"
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.Ft size_t
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.Fn unparse_time "int seconds" "char *buf" "size_t len"
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.Ft size_t
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.Fn unparse_time_approx "int seconds" "char *buf" "size_t len"
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.Sh DESCRIPTION
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The
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.Fn parse_time
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function converts a the period of time specified in
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into a number of seconds.
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The
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.Fa timespec
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can be any number of
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.Aq number unit
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pairs separated by comma and whitespace. The number can be
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negative. Number without explicit units are taken as being
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.Fa def_unit .
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.Pp
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The
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.Fn unparse_time
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and
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.Fn unparse_time_approx
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does the opposite of
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.Fn parse_time ,
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that is they take a number of seconds and express that as human
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readable string.
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.Fa unparse_time
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produces an exact time, while
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.Fa unparse_time_approx
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restricts the result to only include one units.
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.Pp
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.Fn print_time_table
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prints a descriptive list of available units on the passed file
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descriptor.
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.Pp
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The possible units include:
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.Bl -tag -width "month" -compact -offset indent
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.It Li second , s
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.It Li minute , m
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.It Li hour , h
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.It day
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.It week
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seven days
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.It month
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30 days
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.It year
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365 days
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.El
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.Pp
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Units names can be arbitrarily abbreviated (as long as they are
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unique).
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.Sh RETURN VALUES
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.Fn parse_time
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returns the number of seconds that represents the expression in
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.Fa timespec
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or -1 on error.
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.Fn unparse_time
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and
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.Fn unparse_time_approx
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return the number of characters written to
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.Fa buf .
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if the return value is greater than or equal to the
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.Fa len
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argument, the string was too short and some of the printed characters
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were discarded.
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.Sh EXAMPLES
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.Bd -literal
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#include <stdio.h>
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#include <parse_time.h>
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int
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main(int argc, char **argv)
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{
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int i;
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int result;
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char buf[128];
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print_time_table(stdout);
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for (i = 1; i < argc; i++) {
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result = parse_time(argv[i], "second");
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if(result == -1) {
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fprintf(stderr, "%s: parse error\\n", argv[i]);
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continue;
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}
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printf("--\\n");
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printf("parse_time = %d\\n", result);
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unparse_time(result, buf, sizeof(buf));
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printf("unparse_time = %s\\n", buf);
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unparse_time_approx(result, buf, sizeof(buf));
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printf("unparse_time_approx = %s\\n", buf);
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}
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return 0;
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}
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.Ed
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.Bd -literal
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$ ./a.out "1 minute 30 seconds" "90 s" "1 y -1 s"
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1 year = 365 days
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1 month = 30 days
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1 week = 7 days
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1 day = 24 hours
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1 hour = 60 minutes
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1 minute = 60 seconds
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1 second
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--
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parse_time = 90
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unparse_time = 1 minute 30 seconds
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unparse_time_approx = 1 minute
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--
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parse_time = 90
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unparse_time = 1 minute 30 seconds
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unparse_time_approx = 1 minute
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--
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parse_time = 31535999
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unparse_time = 12 months 4 days 23 hours 59 minutes 59 seconds
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unparse_time_approx = 12 months
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.Ed
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.Sh BUGS
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Since
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.Fn parse_time
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returns -1 on error there is no way to parse "minus one second".
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Currently "s" at the end of units is ignored. This is a hack for
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English plural forms. If these functions are ever localised, this
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scheme will have to change.
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.\".Sh SEE ALSO
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.\".Xr parse_bytes 3
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.\".Xr parse_units 3
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