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calendarspec: allow repetition values with ranges

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"Every other hour from 9 until 5" can be written as
`9..17/2:00` instead of `9,11,13,15,17:00`
This commit is contained in:
Douglas Christman
2016-12-16 19:27:33 -05:00
parent ebc8968bc0
commit a2eb5ea79c
4 changed files with 120 additions and 89 deletions
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src/basic/calendarspec.c
+96 -80
View File
@@ -33,11 +33,9 @@
#include "parse-util.h"
#include "string-util.h"
/* Longest valid date/time range is 1970..2199 */
#define MAX_RANGE_LEN 230
#define MIN_YEAR 1970
#define MAX_YEAR 2199
#define BITS_WEEKDAYS 127
#define BITS_WEEKDAYS 127
#define MIN_YEAR 1970
#define MAX_YEAR 2199
static void free_chain(CalendarComponent *c) {
CalendarComponent *n;
@@ -72,6 +70,11 @@ static int component_compare(const void *_a, const void *_b) {
if ((*a)->value > (*b)->value)
return 1;
if ((*a)->range_end < (*b)->range_end)
return -1;
if ((*a)->range_end > (*b)->range_end)
return 1;
if ((*a)->repeat < (*b)->repeat)
return -1;
if ((*a)->repeat > (*b)->repeat)
@@ -80,15 +83,24 @@ static int component_compare(const void *_a, const void *_b) {
return 0;
}
static void sort_chain(CalendarComponent **c) {
static void normalize_chain(CalendarComponent **c) {
unsigned n = 0, k;
CalendarComponent **b, *i, **j, *next;
assert(c);
for (i = *c; i; i = i->next)
for (i = *c; i; i = i->next) {
n++;
/*
* While we're counting the chain, also normalize `range_end`
* so the length of the range is a multiple of `repeat`
*/
if (i->range_end > i->value)
i->range_end -= (i->range_end - i->value) % i->repeat;
}
if (n <= 1)
return;
@@ -125,9 +137,15 @@ static void fix_year(CalendarComponent *c) {
if (c->value >= 0 && c->value < 70)
c->value += 2000;
if (c->range_end >= 0 && c->range_end < 70)
c->range_end += 2000;
if (c->value >= 70 && c->value < 100)
c->value += 1900;
if (c->range_end >= 70 && c->range_end < 100)
c->range_end += 1900;
c = n;
}
}
@@ -143,12 +161,12 @@ int calendar_spec_normalize(CalendarSpec *c) {
fix_year(c->year);
sort_chain(&c->year);
sort_chain(&c->month);
sort_chain(&c->day);
sort_chain(&c->hour);
sort_chain(&c->minute);
sort_chain(&c->microsecond);
normalize_chain(&c->year);
normalize_chain(&c->month);
normalize_chain(&c->day);
normalize_chain(&c->hour);
normalize_chain(&c->minute);
normalize_chain(&c->microsecond);
return 0;
}
@@ -157,20 +175,32 @@ _pure_ static bool chain_valid(CalendarComponent *c, int from, int to, bool end_
if (!c)
return true;
/* Forbid dates more than 28 days from the end of the month */
if (end_of_month)
to -= 3;
if (c->value < from || c->value > to)
return false;
/*
* c->repeat must be short enough so at least one repetition may
* occur before the end of the interval. For dates scheduled
* relative to the end of the month, c->value corresponds to the
* Nth last day of the month.
* relative to the end of the month, c->value and c->range_end
* correspond to the Nth last day of the month.
*/
if (end_of_month && c->value - c->repeat < from)
return false;
if (c->range_end >= 0) {
if (c->range_end < from || c ->range_end > to)
return false;
if (!end_of_month && c->value + c->repeat > to)
return false;
if (c->value + c->repeat > c->range_end)
return false;
} else {
if (end_of_month && c->value - c->repeat < from)
return false;
if (!end_of_month && c->value + c->repeat > to)
return false;
}
if (c->next)
return chain_valid(c->next, from, to, end_of_month);
@@ -255,7 +285,6 @@ static void format_weekdays(FILE *f, const CalendarSpec *c) {
}
static void format_chain(FILE *f, int space, const CalendarComponent *c, bool usec) {
const CalendarComponent *n, *p;
int d = usec ? (int) USEC_PER_SEC : 1;
assert(f);
@@ -268,31 +297,20 @@ static void format_chain(FILE *f, int space, const CalendarComponent *c, bool us
assert(c->value >= 0);
fprintf(f, "%0*i", space, c->value / d);
if (c->value % d != 0)
if (c->value % d > 0)
fprintf(f, ".%06i", c->value % d);
if (c->repeat != 0)
if (c->range_end > 0)
fprintf(f, "..%0*i", space, c->range_end / d);
if (c->range_end % d > 0)
fprintf(f, ".%06i", c->range_end % d);
if (c->repeat > 0 && !(c->range_end > 0 && c->repeat == d))
fprintf(f, "/%i", c->repeat / d);
if (c->repeat % d != 0)
if (c->repeat % d > 0)
fprintf(f, ".%06i", c->repeat % d);
p = c;
for (;;) {
n = p->next;
if (!n || n->repeat || p->repeat)
break;
if (n->value - p->value != d)
break;
p = n;
}
if (p->value - c->value >= 2 * d) {
fputs("..", f);
format_chain(f, space, p, usec);
} else if (c->next) {
if (c->next) {
fputc(',', f);
format_chain(f, space, c->next, usec);
}
@@ -531,6 +549,7 @@ static int const_chain(int value, CalendarComponent **c) {
return -ENOMEM;
cc->value = value;
cc->range_end = -1;
cc->repeat = 0;
cc->next = *c;
@@ -540,7 +559,7 @@ static int const_chain(int value, CalendarComponent **c) {
}
static int prepend_component(const char **p, bool usec, CalendarComponent **c) {
unsigned long i, value, range_end, range_inc, repeat = 0;
unsigned long value, range_end = -1, repeat = 0;
CalendarComponent *cc;
int r;
const char *e;
@@ -554,6 +573,15 @@ static int prepend_component(const char **p, bool usec, CalendarComponent **c) {
if (r < 0)
return r;
if (e[0] == '.' && e[1] == '.') {
e += 2;
r = parse_component_decimal(&e, usec, &range_end);
if (r < 0)
return r;
repeat = usec ? USEC_PER_SEC : 1;
}
if (*e == '/') {
e++;
r = parse_component_decimal(&e, usec, &repeat);
@@ -562,30 +590,6 @@ static int prepend_component(const char **p, bool usec, CalendarComponent **c) {
if (repeat == 0)
return -ERANGE;
} else if (e[0] == '.' && e[1] == '.') {
e += 2;
r = parse_component_decimal(&e, usec, &range_end);
if (r < 0)
return r;
if (value >= range_end)
return -EINVAL;
range_inc = usec ? USEC_PER_SEC : 1;
/* Don't allow impossibly large ranges... */
if (range_end - value >= MAX_RANGE_LEN * range_inc)
return -EINVAL;
/* ...or ranges with only a single element */
if (range_end - value < range_inc)
return -EINVAL;
for (i = value; i <= range_end; i += range_inc) {
r = const_chain(i, c);
if (r < 0)
return r;
}
}
if (*e != 0 && *e != ' ' && *e != ',' && *e != '-' && *e != '~' && *e != ':')
@@ -596,6 +600,7 @@ static int prepend_component(const char **p, bool usec, CalendarComponent **c) {
return -ENOMEM;
cc->value = value;
cc->range_end = range_end;
cc->repeat = repeat;
cc->next = *c;
@@ -1014,11 +1019,24 @@ fail:
return r;
}
static int find_end_of_month(struct tm *tm, bool utc, int day)
{
struct tm t = *tm;
t.tm_mon++;
t.tm_mday = 1 - day;
if (mktime_or_timegm(&t, utc) == (time_t) -1 ||
t.tm_mon != tm->tm_mon)
return -1;
return t.tm_mday;
}
static int find_matching_component(const CalendarSpec *spec, const CalendarComponent *c,
struct tm *tm, int *val) {
const CalendarComponent *n, *p = c;
struct tm t;
int v, d = -1;
int v, e, d = -1;
bool d_set = false;
int r;
@@ -1030,18 +1048,16 @@ static int find_matching_component(const CalendarSpec *spec, const CalendarCompo
while (c) {
n = c->next;
if (spec->end_of_month && p == spec->day) {
t = *tm;
t.tm_mon++;
t.tm_mday = 1 - c->value;
v = c->value;
e = c->range_end;
if (mktime_or_timegm(&t, spec->utc) == (time_t) -1 ||
t.tm_mon != tm->tm_mon)
v = -1;
else
v = t.tm_mday;
} else
v = c->value;
if (spec->end_of_month && p == spec->day) {
v = find_end_of_month(tm, spec->utc, v);
e = find_end_of_month(tm, spec->utc, e);
if (e > 0)
SWAP_TWO(v, e);
}
if (v >= *val) {
@@ -1053,9 +1069,9 @@ static int find_matching_component(const CalendarSpec *spec, const CalendarCompo
} else if (c->repeat > 0) {
int k;
k = v + c->repeat * ((*val - v + c->repeat -1) / c->repeat);
k = v + c->repeat * ((*val - v + c->repeat - 1) / c->repeat);
if (!d_set || k < d) {
if ((!d_set || k < d) && (e < 0 || k <= e)) {
d = k;
d_set = true;
}
src/basic/calendarspec.h
+1
View File
@@ -29,6 +29,7 @@
typedef struct CalendarComponent {
int value;
int range_end;
int repeat;
struct CalendarComponent *next;