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/*
* Copyright Jan Engelhardt, 2012
*
* This file is part of libHX. libHX is free software; you can
* redistribute it and/or modify it under the terms of the GNU Lesser
* General Public License as published by the Free Software Foundation;
* either version 2.1 or (at your option) any later version.
*/
#include <sys/stat.h>
#include <sys/time.h>
#include <stdbool.h>
#include <time.h>
#include <libHX/misc.h>
#include "internal.h"
#define MICROSECOND 100000
#define NANOSECOND 1000000000
#define NANOSECOND_LL 1000000000LL
#ifdef HAVE_STRUCT_TIMESPEC_TV_NSEC
EXPORT_SYMBOL bool HX_timespec_isneg(const struct timespec *x)
{
return (x->tv_sec < 0) || (x->tv_nsec < 0);
}
EXPORT_SYMBOL struct timespec *
HX_timespec_neg(struct timespec *r, const struct timespec *a)
{
if (a->tv_sec != 0) {
r->tv_sec = -a->tv_sec;
r->tv_nsec = a->tv_nsec;
} else {
r->tv_sec = 0;
r->tv_nsec = -a->tv_nsec;
}
return r;
}
EXPORT_SYMBOL struct timespec *HX_timespec_add(struct timespec *r,
const struct timespec *a, const struct timespec *b)
{
/*
* Split the value represented by the struct into two
* independent values that can be added individually.
*/
long nsec[2];
nsec[0] = (a->tv_sec < 0) ? -a->tv_nsec : a->tv_nsec;
nsec[1] = (b->tv_sec < 0) ? -b->tv_nsec : b->tv_nsec;
r->tv_sec = a->tv_sec + b->tv_sec;
r->tv_nsec = nsec[0] + nsec[1];
if (r->tv_nsec >= NANOSECOND) {
++r->tv_sec;
r->tv_nsec -= NANOSECOND;
} else if (r->tv_nsec <= -NANOSECOND) {
--r->tv_sec;
r->tv_nsec += NANOSECOND;
}
/* Combine again */
if (r->tv_sec < 0) {
if (r->tv_nsec < 0) {
r->tv_nsec = -r->tv_nsec;
} else if (r->tv_nsec > 0) {
if (++r->tv_sec == 0)
r->tv_nsec = -NANOSECOND + r->tv_nsec;
else
r->tv_nsec = NANOSECOND - r->tv_nsec;
}
} else if (r->tv_sec > 0 && r->tv_nsec < 0) {
--r->tv_sec;
r->tv_nsec = NANOSECOND + r->tv_nsec;
}
return r;
}
EXPORT_SYMBOL struct timespec *HX_timespec_sub(struct timespec *r,
const struct timespec *a, const struct timespec *b)
{
struct timespec b2;
return HX_timespec_add(r, a, HX_timespec_neg(&b2, b));
}
EXPORT_SYMBOL struct timespec *
HX_timespec_mul(struct timespec *r, const struct timespec *a, int f)
{
long long t;
t = a->tv_sec * NANOSECOND_LL +
((a->tv_sec >= 0) ? a->tv_nsec : -a->tv_nsec);
t *= f;
r->tv_sec = t / NANOSECOND;
r->tv_nsec = t % NANOSECOND;
if (r->tv_sec < 0 && r->tv_nsec < 0)
r->tv_nsec = -r->tv_nsec;
return r;
}
EXPORT_SYMBOL struct timespec *
HX_timespec_mulf(struct timespec *r, const struct timespec *a, double f)
{
double t;
t = (a->tv_sec * NANOSECOND_LL +
((a->tv_sec >= 0) ? a->tv_nsec : -a->tv_nsec)) * f;
r->tv_sec = t / NANOSECOND;
/*
* This is quite the same as r->tv_nsec = fmod(t, NANOSECOND),
* except that without the library call, we are faster.
*/
r->tv_nsec = t - r->tv_sec * NANOSECOND_LL;
if (r->tv_sec < 0 && r->tv_nsec < 0)
r->tv_nsec = -r->tv_nsec;
return r;
}
#endif
#ifdef HAVE_STRUCT_TIMEVAL_TV_USEC
EXPORT_SYMBOL struct timeval *HX_timeval_sub(struct timeval *delta,
const struct timeval *future, const struct timeval *past)
{
delta->tv_sec = future->tv_sec - past->tv_sec;
delta->tv_usec = future->tv_usec - past->tv_usec;
if (future->tv_sec < past->tv_sec || (future->tv_sec == past->tv_sec &&
future->tv_usec < past->tv_usec)) {
if (future->tv_usec > past->tv_usec) {
delta->tv_usec = -MICROSECOND + delta->tv_usec;
++delta->tv_sec;
}
if (delta->tv_sec < 0)
delta->tv_usec *= -1;
} else if (delta->tv_usec < 0) {
delta->tv_usec += MICROSECOND;
--delta->tv_sec;
}
return delta;
}
#endif
EXPORT_SYMBOL long HX_time_compare(const struct stat *a,
const struct stat *b, char sel)
{
long r;
#if defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
if (sel == 'm')
return ((r = a->st_mtime - b->st_mtime) != 0) ?
r : a->st_mtimensec - b->st_mtimensec;
#ifdef HAVE_STRUCT_STAT_ST_OTIMENSEC
else if (sel == 'o')
return ((r = a->st_otime - b->st_otime) != 0) ?
r : a->st_otimensec - b->st_otimensec;
#endif
else if (sel == 'a')
return ((r = a->st_atime - b->st_atime) != 0) ?
r : a->st_atimensec - b->st_atimensec;
else if (sel == 'c')
return ((r = a->st_ctime - b->st_ctime) != 0) ?
r : a->st_ctimensec - b->st_ctimensec;
#elif defined(HAVE_STRUCT_STAT_ST_MTIM)
if (sel == 'm')
return ((r = a->st_mtim.tv_sec - b->st_mtim.tv_sec) != 0) ?
r : a->st_mtim.tv_nsec - b->st_mtim.tv_nsec;
#ifdef HAVE_STRUCT_STAT_ST_OTIM
else if (sel == 'o')
return ((r = a->st_otim.tv_sec - b->st_otim.tv_sec) != 0) ?
r : a->st_otim.tv_nsec - b->st_otim.tv_nsec;
#endif
else if (sel == 'a')
return ((r = a->st_atim.tv_sec - b->st_atim.tv_sec) != 0) ?
r : a->st_atim.tv_nsec - b->st_atim.tv_nsec;
else if (sel == 'c')
return ((r = a->st_ctim.tv_sec - b->st_ctim.tv_sec) != 0) ?
r : a->st_ctim.tv_nsec - b->st_ctim.tv_nsec;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC)
if (sel == 'm')
return ((r = a->st_mtimespec.tv_sec - b->st_mtimespec.tv_sec) != 0) ?
r : a->st_mtimespec.tv_nsec - b->st_mtimespec.tv_nsec;
#ifdef HAVE_STRUCT_STAT_ST_OTIMESPEC
else if (sel == 'o')
return ((r = a->st_otimespec.tv_sec - b->st_otimespec.tv_sec) != 0) ?
r : a->st_otimespec.tv_nsec - b->st_otimespec.tv_nsec;
#endif
else if (sel == 'a')
return ((r = a->st_atimespec.tv_sec - b->st_atimespec.tv_sec) != 0) ?
r : a->st_atimespec.tv_nsec - b->st_atimespec.tv_nsec;
else if (sel == 'c')
return ((r = a->st_ctimespec.tv_sec - b->st_ctimespec.tv_sec) != 0) ?
r : a->st_ctimespec.tv_nsec - b->st_ctimespec.tv_nsec;
#elif defined(HAVE_STRUCT_STAT_ST_MTIME)
if (sel == 'm')
return a->st_mtime - b->st_mtime;
#ifdef HAVE_STRUCT_STAT_ST_OTIME
else if (sel == 'o')
return a->st_otime - b->st_otime;
#endif
else if (sel == 'a')
return a->st_atime - b->st_atime;
else if (sel == 'c')
return a->st_ctime - b->st_ctime;
#elif defined(HAVE_STRUCT_STAT_ST_MTIM)
if (sel == 'm')
return a->st_mtim - b->st_mtim;
#ifdef HAVE_STRUCT_STAT_ST_OTIM
else if (sel == 'o')
return a->st_otim - b->st_otim;
#endif
else if (sel == 'a')
return a->st_atim - b->st_atim;
else if (sel == 'c')
return a->st_ctim - b->st_ctim;
#else
# error Tis not ending well.
#endif
return 0;
}
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