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/*-
* Copyright (c) 2009-2016 Janne Snabb. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* Software web site:
* https://dist.epipe.com/downtimed/
*
*/
/* Include config.h in case we use autoconf. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <errno.h>
#include <inttypes.h>
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include "downtimedb.h"
/*
* Swap bytes of uint64_t.
*
* We used to be trying to use htobe64() and be64toh().
* Or htobe64() and betoh64().
* Or OSSwapHostToBigInt64() and OSSwapBigToHostInt64().
*
* But the reality is that due to lack of standardization this became
* just a big mess as there is no portable function to do this. Some
* systems (for example RHEL/CentOS 5.5) lack the corresponding functions
* altogether.
*
* Therefore we ignore whatever is available and just define our own
* MY_BSWAP64() macro which is used on little endian architectures.
*
* The implementation is stolen from crypt-sha512.c released into the
* Public Domain by Ulrich Drepper <drepper@redhat.com>.
*/
#ifndef WORDS_BIGENDIAN
#define MY_BSWAP64(n) \
(((n) << 56) \
| (((n) & 0xff00) << 40) \
| (((n) & 0xff0000) << 24) \
| (((n) & 0xff000000) << 8) \
| (((n) >> 8) & 0xff000000) \
| (((n) >> 24) & 0xff0000) \
| (((n) >> 40) & 0xff00) \
| ((n) >> 56))
#endif
/*
* Functions for reading from and writing to the downtime database.
*/
int
downtimedb_read(int fd, struct downtimedb *buf)
{
int ret;
errno = 0;
if ((ret = read(fd, (void *)buf, sizeof(struct downtimedb)))
< sizeof(struct downtimedb)) {
if (ret == 0)
return (0); /* eof */
else {
if (ret != -1) {
/* set errno when it is not a read error */
errno = EILSEQ;
}
return (-1); /* some sort of error */
}
}
#ifndef WORDS_BIGENDIAN
buf->when = (int64_t) MY_BSWAP64((uint64_t) buf->when);
#endif
return (1); /* 1 record read */
}
/* The write function modifies the buffer on the fly to match
* the endianness required in the database. Thus, the supplied
* struct downtimedb will be invalid after calling this function.
*/
int
downtimedb_write(int fd, struct downtimedb *buf)
{
#ifndef WORDS_BIGENDIAN
buf->when = (int64_t) MY_BSWAP64((uint64_t) buf->when);
#endif
errno = 0;
if (write(fd, (void *)buf, sizeof(struct downtimedb))
< sizeof(struct downtimedb))
return (-1);
return (0);
}
/*
* Return time string of absolute time in static buffer.
* Certainly not thread-safe.
*/
char *
timestr_abs(time_t t, const char *fmt, int utc)
{
static char str[256];
struct tm *lt;
if (t != 0) {
if ((lt = (utc ? gmtime(&t) : localtime(&t))) == NULL)
goto err;
if (strftime(str, sizeof(str), fmt, lt) == 0)
goto err;
return (str);
}
err:
/* we have the backslashes here to avoid interpretation as trigraphs */
return ("?\?\?\?-?\?-?\? ?\?:?\?:?\?");
}
/*
* Stolen from top.c. Return time interval in human-readable (?) static
* string. Definitely not thread-safe.
*/
char *
timestr_int(time_t t)
{
int days, hrs, mins, secs;
static char str[100];
days = t / 86400;
t %= 86400;
hrs = t / 3600;
t %= 3600;
mins = t / 60;
secs = t % 60;
if (days > 0)
snprintf(str, sizeof(str), "%d+%02d:%02d:%02d",
days, hrs, mins, secs);
else
snprintf(str, sizeof(str), "%02d:%02d:%02d",
hrs, mins, secs);
return (str);
}
/* eof */
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