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- /* Parse a time duration and return a seconds count
- Copyright (C) 2008 Free Software Foundation, Inc.
- Written by Bruce Korb <bkorb@gnu.org>, 2008.
- 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */
- /*
- Readers and users of this function are referred to the ISO-8601
- specification, with particular attention to "Durations".
- At the time of writing, this worked:
- http://en.wikipedia.org/wiki/ISO_8601#Durations
- The string must start with a 'P', 'T' or a digit.
- ==== if it is a digit
- the string may contain: NNN d NNN h NNN m NNN s
- This represents NNN days, NNN hours, NNN minutes and NNN seconds.
- The embeded white space is optional.
- These terms must appear in this order.
- The final "s" is optional.
- All of the terms ("NNN" plus designator) are optional.
- Minutes and seconds may optionally be represented as NNN:NNN.
- Also, hours, minute and seconds may be represented as NNN:NNN:NNN.
- There is no limitation on the value of any of the terms, except
- that the final result must fit in a time_t value.
- ==== if it is a 'P' or 'T', please see ISO-8601 for a rigorous definition.
- The 'P' term may be followed by any of three formats:
- yyyymmdd
- yy-mm-dd
- yy Y mm M ww W dd D
- or it may be empty and followed by a 'T'. The "yyyymmdd" must be eight
- digits long. Note: months are always 30 days and years are always 365
- days long. 5 years is always 1825, not 1826 or 1827 depending on leap
- year considerations. 3 months is always 90 days. There is no consideration
- for how many days are in the current, next or previous months.
- For the final format:
- * Embedded white space is allowed, but it is optional.
- * All of the terms are optional. Any or all-but-one may be omitted.
- * The meanings are yy years, mm months, ww weeks and dd days.
- * The terms must appear in this order.
- ==== The 'T' term may be followed by any of these formats:
- hhmmss
- hh:mm:ss
- hh H mm M ss S
- For the final format:
- * Embedded white space is allowed, but it is optional.
- * All of the terms are optional. Any or all-but-one may be omitted.
- * The terms must appear in this order.
- */
- #ifndef GNULIB_PARSE_DURATION_H
- #define GNULIB_PARSE_DURATION_H
- #include <time.h>
- #define BAD_TIME ((time_t)~0)
- extern time_t parse_duration(char const * in_pz);
- #endif /* GNULIB_PARSE_DURATION_H */
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