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/* SPDX-License-Identifier: GPL-2.0 */
#include <stdlib.h>
#include <assert.h>
#include <inttypes.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include "gcc-compat.h"
#include "err.h"
#include "snap.h"
#include "str.h"
#include "tv.h"
#include "file.h"
/*
* Wrapper for isdigit.
* NetBSD needs this.
*
* The values should be cast to an unsigned char first, then to int.
* Why? Because the isdigit (as do all other is/to functions/macros)
* expect a number from 0 upto and including 255 as their (int) argument.
* Because char is signed on most systems, casting it to int immediately
* gives the functions an argument between -128 and 127 (inclusive),
* which they will use as an array index, and which will thus fail
* horribly for characters which have their most significant bit set.
*/
#define dss_isdigit(c) isdigit((int)(unsigned char)(c))
unsigned desired_number_of_snapshots(int interval_num, int num_intervals)
{
unsigned n;
assert(interval_num >= 0);
if (interval_num >= num_intervals)
return 0;
n = num_intervals - interval_num - 1;
return 1 << n;
}
/* return: Whether dirname is a snapshot directory (0: no, 1: yes) */
static int is_snapshot(const char *dirname, int64_t now, int unit_interval,
struct snapshot *s)
{
int i, ret;
char *dash, *dot, *tmp;
int64_t num;
assert(dirname);
dash = strchr(dirname, '-');
if (!dash || !dash[1] || dash == dirname)
return 0;
for (i = 0; dirname[i] != '-'; i++)
if (!dss_isdigit(dirname[i]))
return 0;
tmp = dss_strdup(dirname);
tmp[i] = '\0';
ret = dss_atoi64(tmp, &num);
free(tmp);
if (ret < 0)
return 0;
assert(num >= 0);
if (num > now)
return 0;
s->creation_time = num;
s->interval = (long long) ((now - s->creation_time)
/ unit_interval / 24 / 3600);
if (!strcmp(dash + 1, "incomplete")) {
s->completion_time = -1;
s->flags = 0; /* neither complete, nor being deleted */
goto success;
}
if (!strcmp(dash + 1, "incomplete.being_deleted")) {
s->completion_time = -1;
s->flags = SS_BEING_DELETED; /* not complete, being deleted */
goto success;
}
tmp = dash + 1;
dot = strchr(tmp, '.');
if (!dot || !dot[1] || dot == tmp)
return 0;
for (i = 0; tmp[i] != '.'; i++)
if (!dss_isdigit(tmp[i]))
return 0;
tmp = dss_strdup(dash + 1);
tmp[i] = '\0';
ret = dss_atoi64(tmp, &num);
free(tmp);
if (ret < 0)
return 0;
if (num > now || num < s->creation_time)
return 0;
s->completion_time = num;
s->flags = SS_COMPLETE;
if (!strcmp(dot + 1, "being_deleted"))
s->flags |= SS_BEING_DELETED;
success:
s->name = dss_strdup(dirname);
return 1;
}
struct add_snapshot_data {
int unit_interval;
int num_intervals;
struct snapshot_list *sl;
};
#define DSS_MIN(a,b) ((a) < (b) ? (a) : (b))
static int add_snapshot(const char *dirname, void *private)
{
struct add_snapshot_data *asd = private;
struct snapshot_list *sl = asd->sl;
struct snapshot s;
int ret = is_snapshot(dirname, sl->now, asd->unit_interval, &s);
if (!ret)
return 1;
if (sl->num_snapshots >= sl->array_size) {
sl->array_size = 2 * sl->array_size + 1;
sl->snapshots = dss_realloc(sl->snapshots,
sl->array_size * sizeof(struct snapshot *));
}
sl->snapshots[sl->num_snapshots] = dss_malloc(sizeof(struct snapshot));
*(sl->snapshots[sl->num_snapshots]) = s;
sl->interval_count[DSS_MIN(s.interval, asd->num_intervals)]++;
sl->num_snapshots++;
return 1;
}
#define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
static int compare_snapshots(const void *a, const void *b)
{
struct snapshot *s1 = *(struct snapshot * const *)a;
struct snapshot *s2 = *(struct snapshot * const *)b;
return NUM_COMPARE(s2->creation_time, s1->creation_time);
}
/* The returned snapshot list is sorted by creation time. */
void get_snapshot_list(struct snapshot_list *sl, int unit_interval,
int num_intervals)
{
struct add_snapshot_data asd;
asd.unit_interval = unit_interval;
asd.num_intervals = num_intervals;
asd.sl = sl;
sl->now = get_current_time();
sl->num_snapshots = 0;
sl->array_size = 0;
sl->snapshots = NULL;
sl->interval_count = dss_calloc((num_intervals + 1) * sizeof(unsigned));
for_each_subdir(add_snapshot, &asd);
qsort(sl->snapshots, sl->num_snapshots, sizeof(struct snapshot *),
compare_snapshots);
}
void free_snapshot_list(struct snapshot_list *sl)
{
int i;
struct snapshot *s;
FOR_EACH_SNAPSHOT(s, i, sl) {
free(s->name);
free(s);
}
free(sl->interval_count);
sl->interval_count = NULL;
free(sl->snapshots);
sl->snapshots = NULL;
sl->num_snapshots = 0;
}
__malloc char *incomplete_name(int64_t start)
{
return make_message("%" PRId64 "-incomplete", start);
}
__malloc char *being_deleted_name(struct snapshot *s)
{
if (s->flags & SS_COMPLETE)
return make_message("%" PRId64 "-%" PRId64 ".being_deleted",
s->creation_time, s->completion_time);
return make_message("%" PRId64 "-incomplete.being_deleted", s->creation_time);
}
int complete_name(int64_t start, int64_t end, char **result)
{
struct tm start_tm, end_tm;
time_t *start_seconds = (time_t *) (uint64_t *)&start; /* STFU, gcc */
time_t *end_seconds = (time_t *) (uint64_t *)&end; /* STFU, gcc */
char start_str[200], end_str[200];
if (!localtime_r(start_seconds, &start_tm))
return -E_LOCALTIME;
if (!localtime_r(end_seconds, &end_tm))
return -E_LOCALTIME;
if (!strftime(start_str, sizeof(start_str), "%a_%b_%d_%Y_%H_%M_%S", &start_tm))
return -E_STRFTIME;
if (!strftime(end_str, sizeof(end_str), "%a_%b_%d_%Y_%H_%M_%S", &end_tm))
return -E_STRFTIME;
*result = make_message("%" PRId64 "-%" PRId64 ".%s-%s", start, end,
start_str, end_str);
return 1;
}
__malloc char *name_of_newest_complete_snapshot(struct snapshot_list *sl)
{
struct snapshot *s;
int i;
char *name = NULL;
FOR_EACH_SNAPSHOT_REVERSE(s, i, sl) {
if (s->flags != SS_COMPLETE) /* incomplete or being deleted */
continue;
name = dss_strdup(s->name);
break;
}
return name;
}
int num_complete_snapshots(struct snapshot_list *sl)
{
struct snapshot *s;
int i, ret = 0;
FOR_EACH_SNAPSHOT(s, i, sl)
if (s->flags & SS_COMPLETE)
ret++;
return ret;
}
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