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/*** dround.c -- perform simple date arithmetic, round to duration
*
* Copyright (C) 2012-2018 Sebastian Freundt
*
* Author: Sebastian Freundt <freundt@ga-group.nl>
*
* This file is part of dateutils.
*
* 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.
*
* 3. Neither the name of the author nor the names of any contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR "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 REGENTS 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.
*
**/
#if defined HAVE_CONFIG_H
# include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/time.h>
#include <time.h>
#include "dt-core.h"
#include "dt-io.h"
#include "dt-core-tz-glue.h"
#include "dt-locale.h"
#include "prchunk.h"
/* parsers and formatters */
#include "date-core-strpf.h"
#include "date-core-private.h"
#if !defined assert
# define assert(x)
#endif /* !assert */
const char *prog = "dround";
static struct dt_t_s
tround_tdur_cocl(struct dt_t_s t, struct dt_dtdur_s dur, bool nextp)
{
/* this will return the rounded to DUR time of T and, to encode carry
* (which can only take values 0 or 1), we will use t's neg bit */
unsigned int tunp;
signed int sdur;
bool downp = false;
/* we won't have carries, ever */
t.carry = 0;
/* get directions, no dur is a no-op */
if (UNLIKELY(!(sdur = dur.dv))) {
/* IPO/LTO hack */
goto out;
} else if (sdur < 0) {
downp = true;
sdur = -sdur;
} else if (dur.neg) {
downp = true;
}
switch (dur.durtyp) {
case DT_DURH:
sdur *= MINS_PER_HOUR;
/*@fallthrough@*/
case DT_DURM:
sdur *= SECS_PER_MIN;
/*@fallthrough@*/
case DT_DURS:
/* only accept values whose remainder is 0 */
if (LIKELY(!(SECS_PER_DAY % (unsigned int)sdur))) {
break;
}
/*@fallthrough@*/
default:
/* IPO/LTO hack */
goto out;
}
/* unpack t */
tunp = (t.hms.h * MINS_PER_HOUR + t.hms.m) * SECS_PER_MIN + t.hms.s;
with (unsigned int diff = tunp % (unsigned int)sdur) {
if (!diff && !nextp) {
/* do nothing, i.e. really nothing,
* in particular, don't set the slots again in the
* assign section
* this is not some obscure optimisation but to
* support special notations like, military midnight
* or leap seconds */
goto out;
} else if (!downp) {
tunp += sdur - diff;
} else if (!diff/* && downp && nextp*/) {
tunp -= sdur;
} else {
tunp -= diff;
}
}
/* assign */
t.hms.ns = 0;
t.hms.s = tunp % SECS_PER_MIN;
tunp /= SECS_PER_MIN;
t.hms.m = tunp % MINS_PER_HOUR;
tunp /= MINS_PER_HOUR;
t.hms.h = tunp % HOURS_PER_DAY;
out:
return t;
}
static struct dt_t_s
tround_tdur(struct dt_t_s t, struct dt_dtdur_s dur, bool nextp)
{
/* this will return the rounded to DUR time of T and, to encode carry
* (which can only take values 0 or 1), we will use t's neg bit */
bool downp = false;
signed int dv;
/* initialise carry */
t.carry = 0;
/* get directions */
if ((dv = dur.dv) < 0) {
downp = true;
dv = -dv;
} else if (dur.neg) {
downp = true;
}
switch (dur.durtyp) {
case DT_DURH:
if ((!downp && t.hms.h < dv) ||
(downp && t.hms.h > dv)) {
/* no carry adjustments */
t.hms.h = dv;
} else if (t.hms.h == dv && !nextp) {
/* we're on the hour in question */
t.hms.h = dv;
} else if (!downp) {
t.hms.h = dv;
hour_oflo:
t.carry = 1;
} else {
t.hms.h = dv;
hour_uflo:
t.carry = -1;
}
break;
case DT_DURM:
if ((!downp && t.hms.m < dv) ||
(downp && t.hms.m > dv)) {
/* no carry adjustments */
t.hms.m = dv;
} else if (t.hms.m == dv && !nextp) {
/* we're on the hour in question */
t.hms.m = dv;
} else if (!downp) {
t.hms.m = dv;
min_oflo:
if (UNLIKELY(++t.hms.h >= HOURS_PER_DAY)) {
t.hms.h = 0;
goto hour_oflo;
}
} else {
t.hms.m = dv;
min_uflo:
if (UNLIKELY(!t.hms.h--)) {
t.hms.h = HOURS_PER_DAY - 1;
goto hour_uflo;
}
}
break;
case DT_DURS:
if ((!downp && t.hms.s < dv) ||
(downp && t.hms.s > dv)) {
/* no carry adjustments */
t.hms.s = dv;
} else if (t.hms.s == dv && !nextp) {
/* we're on the hour in question */
t.hms.s = dv;
} else if (!downp) {
t.hms.s = dv;
if (UNLIKELY(++t.hms.m >= MINS_PER_HOUR)) {
t.hms.m = 0;
goto min_oflo;
}
} else {
t.hms.s = dv;
if (UNLIKELY(!t.hms.m--)) {
t.hms.m = MINS_PER_HOUR - 1;
goto min_uflo;
}
}
break;
default:
break;
}
return t;
}
static struct dt_d_s
dround_ddur(struct dt_d_s d, struct dt_ddur_s dur, bool nextp)
{
switch (dur.durtyp) {
unsigned int tgt;
bool forw;
case DT_DURD:
if (dur.dv > 0) {
tgt = dur.dv;
forw = true;
} else if (dur.dv < 0) {
tgt = -dur.dv;
forw = false;
} else {
/* user is an idiot */
break;
}
switch (d.typ) {
unsigned int mdays;
case DT_YMD:
if ((forw && d.ymd.d < tgt) ||
(!forw && d.ymd.d > tgt)) {
/* no month or year adjustment */
;
} else if (d.ymd.d == tgt && !nextp) {
/* we're ON the date already and no
* next/prev date is requested */
;
} else if (forw) {
if (LIKELY(d.ymd.m < GREG_MONTHS_P_YEAR)) {
d.ymd.m++;
} else {
d.ymd.m = 1;
d.ymd.y++;
}
} else {
if (UNLIKELY(--d.ymd.m < 1)) {
d.ymd.m = GREG_MONTHS_P_YEAR;
d.ymd.y--;
}
}
/* get ultimo */
mdays = __get_mdays(d.ymd.y, d.ymd.m);
if (UNLIKELY(tgt > mdays)) {
tgt = mdays;
}
/* final assignment */
d.ymd.d = tgt;
break;
default:
break;
}
break;
case DT_DURBD:
/* bizsis only work on bizsidurs atm */
if (dur.dv > 0) {
tgt = dur.dv;
forw = true;
} else if (dur.dv < 0) {
tgt = -dur.dv;
forw = false;
} else {
/* user is an idiot */
break;
}
switch (d.typ) {
unsigned int bdays;
case DT_BIZDA:
if ((forw && d.bizda.bd < tgt) ||
(!forw && d.bizda.bd > tgt)) {
/* no month or year adjustment */
;
} else if (d.bizda.bd == tgt && !nextp) {
/* we're ON the date already and no
* next/prev date is requested */
;
} else if (forw) {
if (LIKELY(d.bizda.m < GREG_MONTHS_P_YEAR)) {
d.bizda.m++;
} else {
d.bizda.m = 1;
d.bizda.y++;
}
} else {
if (UNLIKELY(--d.bizda.m < 1)) {
d.bizda.m = GREG_MONTHS_P_YEAR;
d.bizda.y--;
}
}
/* get ultimo */
bdays = __get_bdays(d.bizda.y, d.bizda.m);
if (UNLIKELY(tgt > bdays)) {
tgt = bdays;
}
/* final assignment */
d.bizda.bd = tgt;
break;
default:
break;
}
break;
case DT_DURYMD:
switch (d.typ) {
unsigned int mdays;
case DT_YMD:
tgt = dur.ymd.m;
forw = !dt_dur_neg_p(dur);
if ((forw && d.ymd.m < tgt) ||
(!forw && d.ymd.m > tgt)) {
/* no year adjustment */
;
} else if (d.ymd.m == tgt && !nextp) {
/* we're IN the month already and no
* next/prev date is requested */
;
} else if (forw) {
/* years don't wrap around */
d.ymd.y++;
} else {
/* years don't wrap around */
d.ymd.y--;
}
/* final assignment */
d.ymd.m = tgt;
/* fixup ultimo mismatches */
mdays = __get_mdays(d.ymd.y, d.ymd.m);
if (UNLIKELY(d.ymd.d > mdays)) {
d.ymd.d = mdays;
}
break;
default:
break;
}
break;
case DT_DURYMCW: {
struct dt_d_s tmp;
unsigned int wday;
signed int diff;
forw = !dt_dur_neg_p(dur);
tgt = dur.ymcw.w;
tmp = dt_dconv(DT_DAISY, d);
wday = dt_get_wday(tmp);
diff = (signed)tgt - (signed)wday;
if ((forw && wday < tgt) ||
(!forw && wday > tgt)) {
/* nothing to do */
;
} else if (wday == tgt && !nextp) {
/* we're on WDAY already, do fuckall */
;
} else if (forw) {
/* week wrap */
diff += 7;
} else {
/* week wrap */
diff -= 7;
}
/* final assignment */
tmp.daisy += diff;
d = dt_dconv(d.typ, tmp);
break;
}
case DT_DURWK:
if (dur.dv > 0) {
tgt = dur.dv;
forw = true;
} else if (dur.dv < 0) {
tgt = -dur.dv;
forw = false;
} else {
/* user is an idiot */
break;
}
switch (d.typ) {
unsigned int nw;
case DT_YWD:
if ((forw && d.ywd.c < tgt) ||
(!forw && d.ywd.c > tgt)) {
/* no year adjustment */
;
} else if (d.ywd.c == tgt && !nextp) {
/* we're IN the week already and no
* next/prev date is requested */
;
} else if (forw) {
/* years don't wrap around */
d.ywd.y++;
} else {
/* years don't wrap around */
d.ywd.y--;
}
/* final assignment */
d.ywd.c = tgt;
/* fixup ultimo mismatches */
nw = __get_isowk(d.ywd.y);
if (UNLIKELY(d.ywd.c > nw)) {
d.ywd.c = nw;
}
break;
default:
break;
}
break;
default:
break;
}
return d;
}
static dt_sexy_t
sxround_dur_cocl(dt_sexy_t t, struct dt_dtdur_s dur, bool nextp)
{
/* this will return the rounded to DUR time of T and, to encode carry
* (which can only take values 0 or 1), we will use t's neg bit */
dt_ssexy_t sdur;
bool downp = false;
/* get directions, no dur is a no-op */
if (UNLIKELY(!(sdur = dur.dv))) {
return t;
} else if (sdur < 0) {
downp = true;
sdur = -sdur;
} else if (dur.neg) {
downp = true;
}
switch (dur.durtyp) {
case DT_DURH:
sdur *= MINS_PER_HOUR;
/*@fallthrough@*/
case DT_DURM:
sdur *= SECS_PER_MIN;
/*@fallthrough@*/
case DT_DURS:
/* only accept values whose remainder is 0 */
if (LIKELY(!(SECS_PER_DAY % (unsigned int)sdur))) {
break;
}
/*@fallthrough@*/
default:
return t;
}
/* unpack t */
with (unsigned int diff = t % (dt_sexy_t)sdur) {
if (!diff && !nextp) {
/* do nothing, i.e. really nothing,
* in particular, don't set the slots again in the
* assign section
* this is not some obscure optimisation but to
* support special notations like, military midnight
* or leap seconds */
return t;
} else if (!downp) {
t += sdur - diff;
} else if (!diff/* && downp && nextp*/) {
t -= sdur;
} else {
t -= diff;
}
}
return t;
}
static struct dt_dt_s
dt_round(struct dt_dt_s d, struct dt_dtdur_s dur, bool nextp)
{
switch (d.typ) {
default:
switch (dur.durtyp) {
default:
/* all the date durs */
break;
case DT_DURH:
case DT_DURM:
case DT_DURS:
case DT_DURNANO:
if (UNLIKELY(dt_sandwich_only_d_p(d))) {
/* this doesn't make sense */
break;
}
if (!dur.cocl) {
d.t = tround_tdur(d.t, dur, nextp);
} else {
d.t = tround_tdur_cocl(d.t, dur, nextp);
}
break;
}
/* check carry */
if (UNLIKELY(d.t.carry)) {
/* we need to add a day */
struct dt_ddur_s one_day =
dt_make_ddur(DT_DURD, d.t.carry);
d.t.carry = 0;
d.d = dt_dadd(d.d, one_day);
}
with (unsigned int sw = d.sandwich) {
d.d = dround_ddur(d.d, dur.d, nextp);
d.sandwich = (uint8_t)sw;
}
break;
case DT_SEXY:
case DT_SEXYTAI:
if (UNLIKELY(!dur.cocl)) {
error("Error: \
Epoch date/times have no divisions to round to.");
break;
}
/* just keep it sexy */
d.sexy = sxround_dur_cocl(d.sexy, dur, nextp);
break;
}
return d;
}
static struct dt_dt_s
dround(struct dt_dt_s d, struct dt_dtdur_s dur[], size_t ndur, bool nextp)
{
for (size_t i = 0; i < ndur; i++) {
d = dt_round(d, dur[i], nextp);
}
return d;
}
/* extended duration reader */
static int
dt_io_strpdtrnd(struct __strpdtdur_st_s *st, const char *str)
{
char *sp = NULL;
struct strpd_s d = strpd_initialiser();
struct dt_spec_s s = spec_initialiser();
struct dt_dtdur_s payload = {(dt_dtdurtyp_t)DT_DURUNK};
bool negp = false;
bool coclp = true;
if (dt_io_strpdtdur(st, str) >= 0) {
return 0;
}
/* check for co-classes */
if (*str == '/') {
coclp = true;
str++;
}
/* check if there's a sign + or - */
if (*str == '-') {
negp = true;
str++;
} else if (*str == '+') {
str++;
}
/* try weekdays, set up s */
s.spfl = DT_SPFL_S_WDAY;
s.abbr = DT_SPMOD_NORM;
if (__strpd_card(&d, str, s, &sp) >= 0) {
#if defined HAVE_ANON_STRUCTS_INIT
payload.d = (struct dt_ddur_s){
DT_DURYMCW,
.neg = negp,
.cocl = coclp,
.ymcw.w = d.w,
};
#else
payload.d.durtyp = DT_DURYMCW;
payload.d.neg = negp;
payload.d.cocl = coclp;
payload.d.ymcw.w = d.w;
#endif
goto out;
}
/* try months, set up s */
s.spfl = DT_SPFL_S_MON;
s.abbr = DT_SPMOD_NORM;
if (__strpd_card(&d, str, s, &sp) >= 0) {
#if defined HAVE_ANON_STRUCTS_INIT
payload.d = (struct dt_ddur_s){
DT_DURYMD,
.neg = negp,
.ymd.m = d.m,
};
#else
payload.d.durtyp = DT_DURYMD;
payload.d.neg = negp;
payload.d.ymd.m = d.m;
#endif
goto out;
}
/* bugger */
st->istr = str;
return -1;
out:
st->sign = 0;
st->cont = NULL;
return __add_dur(st, payload);
}
struct prln_ctx_s {
struct grep_atom_soa_s *ndl;
const char *ofmt;
zif_t fromz;
zif_t outz;
int sed_mode_p;
int quietp;
const struct __strpdtdur_st_s *st;
bool nextp;
};
static int
proc_line(struct prln_ctx_s ctx, char *line, size_t llen)
{
struct dt_dt_s d;
char *sp = NULL;
char *ep = NULL;
int rc = 0;
do {
/* check if line matches, */
d = dt_io_find_strpdt2(
line, llen, ctx.ndl, &sp, &ep, ctx.fromz);
if (!dt_unk_p(d)) {
if (UNLIKELY(d.fix) && !ctx.quietp) {
rc = 2;
}
/* perform addition now */
d = dround(d, ctx.st->durs, ctx.st->ndurs, ctx.nextp);
if (ctx.fromz != NULL) {
/* fixup zone */
d = dtz_forgetz(d, ctx.fromz);
}
if (ctx.sed_mode_p) {
__io_write(line, sp - line, stdout);
dt_io_write(d, ctx.ofmt, ctx.outz, '\0');
llen -= (ep - line);
line = ep;
} else {
dt_io_write(d, ctx.ofmt, ctx.outz, '\n');
break;
}
} else if (ctx.sed_mode_p) {
line[llen] = '\n';
__io_write(line, llen + 1, stdout);
break;
} else {
/* obviously unmatched, warn about it in non -q mode */
if (!ctx.quietp) {
dt_io_warn_strpdt(line);
rc = 2;
}
break;
}
} while (1);
return rc;
}
#include "dround.yucc"
int
main(int argc, char *argv[])
{
yuck_t argi[1U];
struct dt_dt_s d;
struct __strpdtdur_st_s st = __strpdtdur_st_initialiser();
char *inp;
const char *ofmt;
char **fmt;
size_t nfmt;
int rc = 0;
bool dt_given_p = false;
bool nextp = false;
zif_t fromz = NULL;
zif_t z = NULL;
if (yuck_parse(argi, argc, argv)) {
rc = 1;
goto out;
} else if (argi->nargs == 0U) {
error("Error: DATE or DURATION must be specified\n");
yuck_auto_help(argi);
rc = 1;
goto out;
}
/* init and unescape sequences, maybe */
ofmt = argi->format_arg;
fmt = argi->input_format_args;
nfmt = argi->input_format_nargs;
if (argi->backslash_escapes_flag) {
dt_io_unescape(argi->format_arg);
for (size_t i = 0; i < nfmt; i++) {
dt_io_unescape(fmt[i]);
}
}
if (argi->from_locale_arg) {
setilocale(argi->from_locale_arg);
}
if (argi->locale_arg) {
setflocale(argi->locale_arg);
}
/* try and read the from and to time zones */
if (argi->from_zone_arg) {
fromz = dt_io_zone(argi->from_zone_arg);
}
if (argi->zone_arg) {
z = dt_io_zone(argi->zone_arg);
}
if (argi->next_flag) {
nextp = true;
}
if (argi->base_arg) {
struct dt_dt_s base = dt_strpdt(argi->base_arg, NULL, NULL);
dt_set_base(base);
}
/* check first arg, if it's a date the rest of the arguments are
* durations, if not, dates must be read from stdin */
dt_given_p = !dt_unk_p(d = dt_io_strpdt(*argi->args, fmt, nfmt, NULL));
for (size_t i = dt_given_p; i < argi->nargs; i++) {
inp = argi->args[i];
do {
if (dt_io_strpdtrnd(&st, inp) < 0) {
if (UNLIKELY(i == 0)) {
/* that's ok, must be a date then */
dt_given_p = true;
} else {
serror("Error: \
cannot parse duration/rounding string `%s'", st.istr);
}
}
} while (__strpdtdur_more_p(&st));
}
/* sanity checks */
if (dt_given_p) {
/* date parsing needed postponing as we need to find out
* about the durations
* Also from-zone conversion needs postponing as we define
* the conversion to take place on the rounded date */
inp = argi->args[0U];
if (dt_unk_p(d = dt_io_strpdt(inp, fmt, nfmt, NULL))) {
error("Error: \
cannot interpret date/time string `%s'", argi->args[0U]);
rc = 1;
goto out;
}
} else if (st.ndurs == 0) {
error("Error: \
no durations given");
rc = 1;
goto out;
}
/* start the actual work */
if (dt_given_p) {
if (UNLIKELY(d.fix) && !argi->quiet_flag) {
rc = 2;
}
if (!dt_unk_p(d = dround(d, st.durs, st.ndurs, nextp))) {
if (fromz != NULL) {
/* fixup zone */
d = dtz_forgetz(d, fromz);
}
dt_io_write(d, ofmt, z, '\n');
} else {
rc = 1;
}
} else {
/* read from stdin */
size_t lno = 0;
struct grep_atom_s __nstk[16], *needle = __nstk;
size_t nneedle = countof(__nstk);
struct grep_atom_soa_s ndlsoa;
void *pctx;
struct prln_ctx_s prln = {
.ndl = &ndlsoa,
.ofmt = ofmt,
.fromz = fromz,
.outz = z,
.sed_mode_p = argi->sed_mode_flag,
.quietp = argi->quiet_flag,
.st = &st,
.nextp = nextp,
};
/* no threads reading this stream */
__io_setlocking_bycaller(stdout);
/* lest we overflow the stack */
if (nfmt >= nneedle) {
/* round to the nearest 8-multiple */
nneedle = (nfmt | 7) + 1;
needle = calloc(nneedle, sizeof(*needle));
}
/* and now build the needle */
ndlsoa = build_needle(needle, nneedle, fmt, nfmt);
/* using the prchunk reader now */
if ((pctx = init_prchunk(STDIN_FILENO)) == NULL) {
serror("Error: could not open stdin");
goto ndl_free;
}
while (prchunk_fill(pctx) >= 0) {
for (char *line; prchunk_haslinep(pctx); lno++) {
size_t llen = prchunk_getline(pctx, &line);
rc |= proc_line(prln, line, llen);
}
}
/* get rid of resources */
free_prchunk(pctx);
ndl_free:
if (needle != __nstk) {
free(needle);
}
goto out;
}
/* free the strpdur status */
__strpdtdur_free(&st);
dt_io_clear_zones();
if (argi->from_locale_arg) {
setilocale(NULL);
}
if (argi->locale_arg) {
setflocale(NULL);
}
out:
yuck_free(argi);
return rc;
}
/* dround.c ends here */
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