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Annotation of src/usr.bin/make/timestamp.h, Revision 1.1

1.1     ! espie       1: #ifndef TIMESTAMP_H
        !             2: #define TIMESTAMP_H
        !             3:
        !             4: /*     $OpenPackages$ */
        !             5: /*     $OpenBSD$ */
        !             6:
        !             7: /*
        !             8:  * Copyright (c) 2001 Marc Espie.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  *
        !            19:  * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
        !            20:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
        !            21:  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
        !            22:  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
        !            23:  * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
        !            24:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
        !            25:  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            26:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            27:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            28:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
        !            29:  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            30:  */
        !            31:
        !            32: /* This module handles time stamps on files in a relatively high-level way.
        !            33:  * Most of the interface is achieved through inlineable code.
        !            34:  *
        !            35:  * TIMESTAMP:                  opaque data type to store a date.
        !            36:  * ts_set_out_of_date(t):      set up t so that it is out-of-date.
        !            37:  * b = is_out_of_date(t):      check whether t is out-of-date.
        !            38:  * ts_set_from_stat(s, t):     grab date out of stat(2) buffer.
        !            39:  * b = is_strictly_before(t1, t2):
        !            40:  *                             check whether t1 is before t2.
        !            41:  * stamp = timestamp2time_t(t):        extract time_t from timestamp.
        !            42:  * ts_set_from_time_t(d, t):   create timestamp from time_t.
        !            43:  * ts_set_from_now(n):         grab current date.
        !            44:  */
        !            45:
        !            46: /* sysresult = set_times(name):        set modification times on a file.
        !            47:  *                             system call results.
        !            48:  */
        !            49:
        !            50: #define Init_Timestamp()       ts_set_from_now(now)
        !            51:
        !            52: #ifndef TIMESTAMP_TYPE
        !            53: #include "timestamp_t.h"
        !            54: #endif
        !            55: #ifdef USE_TIMESPEC
        !            56: #define ts_set_out_of_date(t)  (t).tv_sec = INT_MIN, (t).tv_nsec = 0
        !            57: #define is_out_of_date(t)      ((t).tv_sec == INT_MIN && (t).tv_nsec == 0)
        !            58: #define ts_set_from_stat(s, t) \
        !            59: do { \
        !            60:        (t).tv_sec = (s).st_mtime; \
        !            61:        (t).tv_nsec = (s).st_mtimensec; \
        !            62:        if (is_out_of_date(t)) \
        !            63:                (t).tv_nsec++; \
        !            64: } while (0)
        !            65: #define is_strictly_before(t1, t2)     timespeccmp(&(t1), &(t2), <)
        !            66: #define ts_set_from_time_t(d, t) \
        !            67: do { \
        !            68:        (t).tv_sec = d; \
        !            69:        (t).tv_nsec = 0; \
        !            70:        if (is_out_of_date(t)) \
        !            71:                (t).tv_nsec++; \
        !            72: } while (0)
        !            73: #define ts_set_from_now(n) \
        !            74: do { \
        !            75:        struct timeval tv; \
        !            76:        gettimeofday(&tv, NULL); \
        !            77:        TIMEVAL_TO_TIMESPEC(&(tv), &n); \
        !            78: } while (0)
        !            79: #define timestamp2time_t(t)    ((t).tv_sec)
        !            80: #else
        !            81: #define is_out_of_date(t)      ((t) == INT_MIN)
        !            82: #define ts_set_out_of_date(t)  (t) = INT_MIN
        !            83: #define ts_set_from_stat(s, t) \
        !            84: do { \
        !            85:        (t) = (s).st_mtime; \
        !            86:        if (is_out_of_date(t)) \
        !            87:                (t)++; \
        !            88: } while (0)
        !            89: #define is_strictly_before(t1, t2)     ((t1) < (t2))
        !            90: #define ts_set_from_time_t(d, t) \
        !            91: do { \
        !            92:        (t) = d; \
        !            93:        if (is_out_of_date(t)) \
        !            94:                (t)++; \
        !            95: } while (0)
        !            96: #define ts_set_from_now(n) time(&(n))
        !            97: #define timestamp2time_t(t)    (t)
        !            98: #endif
        !            99:
        !           100: extern int set_times(const char *);
        !           101:
        !           102: extern TIMESTAMP now;          /* The time at the start of this whole
        !           103:                                 * process */
        !           104:
        !           105: #endif