2 * Copyright (C) 2008 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
15 #include "gcc-compat.h"
23 * Wrapper for isdigit.
26 * The values should be cast to an unsigned char first, then to int.
27 * Why? Because the isdigit (as do all other is/to functions/macros)
28 * expect a number from 0 upto and including 255 as their (int) argument.
29 * Because char is signed on most systems, casting it to int immediately
30 * gives the functions an argument between -128 and 127 (inclusive),
31 * which they will use as an array index, and which will thus fail
32 * horribly for characters which have their most significant bit set.
34 #define dss_isdigit(c) isdigit((int)(unsigned char)(c))
38 * Return the desired number of snapshots of an interval.
40 unsigned desired_number_of_snapshots(int interval_num, int num_intervals)
44 assert(interval_num >= 0);
46 if (interval_num >= num_intervals)
48 n = num_intervals - interval_num - 1;
52 /* return: Whether dirname is a snapshot directory (0: no, 1: yes) */
53 static int is_snapshot(const char *dirname, int64_t now, int unit_interval,
57 char *dash, *dot, *tmp;
61 dash = strchr(dirname, '-');
62 if (!dash || !dash[1] || dash == dirname)
64 for (i = 0; dirname[i] != '-'; i++)
65 if (!dss_isdigit(dirname[i]))
67 tmp = dss_strdup(dirname);
69 ret = dss_atoi64(tmp, &num);
76 s->creation_time = num;
77 //DSS_DEBUG_LOG("%s start time: %lli\n", dirname, (long long)s->creation_time);
78 s->interval = (long long) ((now - s->creation_time)
79 / unit_interval / 24 / 3600);
80 if (!strcmp(dash + 1, "incomplete")) {
81 s->completion_time = -1;
82 s->flags = 0; /* neither complete, nor being deleted */
85 if (!strcmp(dash + 1, "incomplete.being_deleted")) {
86 s->completion_time = -1;
87 s->flags = SS_BEING_DELETED; /* mot cpmplete, being deleted */
91 dot = strchr(tmp, '.');
92 if (!dot || !dot[1] || dot == tmp)
94 for (i = 0; tmp[i] != '.'; i++)
95 if (!dss_isdigit(tmp[i]))
97 tmp = dss_strdup(dash + 1);
99 ret = dss_atoi64(tmp, &num);
105 s->completion_time = num;
106 s->flags = SS_COMPLETE;
107 if (!strcmp(dot + 1, "being_deleted"))
108 s->flags |= SS_BEING_DELETED;
110 s->name = dss_strdup(dirname);
114 struct add_snapshot_data {
117 struct snapshot_list *sl;
120 /** Compute the minimum of \a a and \a b. */
121 #define DSS_MIN(a,b) ((a) < (b) ? (a) : (b))
123 static int add_snapshot(const char *dirname, void *private)
125 struct add_snapshot_data *asd = private;
126 struct snapshot_list *sl = asd->sl;
128 int ret = is_snapshot(dirname, sl->now, asd->unit_interval, &s);
132 if (sl->num_snapshots >= sl->array_size) {
133 sl->array_size = 2 * sl->array_size + 1;
134 sl->snapshots = dss_realloc(sl->snapshots,
135 sl->array_size * sizeof(struct snapshot *));
137 sl->snapshots[sl->num_snapshots] = dss_malloc(sizeof(struct snapshot));
138 *(sl->snapshots[sl->num_snapshots]) = s;
139 sl->interval_count[DSS_MIN(s.interval, asd->num_intervals)]++;
144 #define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
146 static int compare_snapshots(const void *a, const void *b)
148 struct snapshot *s1 = *(struct snapshot **)a;
149 struct snapshot *s2 = *(struct snapshot **)b;
150 return NUM_COMPARE(s2->creation_time, s1->creation_time);
154 void get_snapshot_list(struct snapshot_list *sl, int unit_interval,
157 struct add_snapshot_data asd = {
158 .unit_interval = unit_interval,
159 .num_intervals = num_intervals,
162 sl->now = get_current_time();
163 sl->num_snapshots = 0;
165 sl->snapshots = NULL;
166 sl->interval_count = dss_calloc((num_intervals + 1) * sizeof(unsigned));
167 for_each_subdir(add_snapshot, &asd);
168 qsort(sl->snapshots, sl->num_snapshots, sizeof(struct snapshot *),
172 void free_snapshot_list(struct snapshot_list *sl)
177 FOR_EACH_SNAPSHOT(s, i, sl) {
181 free(sl->interval_count);
182 sl->interval_count = NULL;
184 sl->snapshots = NULL;
185 sl->num_snapshots = 0;
188 __malloc char *incomplete_name(int64_t start)
190 return make_message("%lli-incomplete", (long long)start);
193 __malloc char *being_deleted_name(struct snapshot *s)
195 if (s->flags & SS_COMPLETE)
196 return make_message("%lli-%lli.being_deleted",
197 (long long)s->creation_time,
198 (long long)s->completion_time);
199 return make_message("%lli-incomplete.being_deleted",
200 (long long)s->creation_time);
203 int complete_name(int64_t start, int64_t end, char **result)
205 struct tm start_tm, end_tm;
206 time_t *start_seconds = (time_t *) (uint64_t *)&start; /* STFU, gcc */
207 time_t *end_seconds = (time_t *) (uint64_t *)&end; /* STFU, gcc */
208 char start_str[200], end_str[200];
210 if (!localtime_r(start_seconds, &start_tm))
212 if (!localtime_r(end_seconds, &end_tm))
214 if (!strftime(start_str, sizeof(start_str), "%a_%b_%d_%Y_%H_%M_%S", &start_tm))
216 if (!strftime(end_str, sizeof(end_str), "%a_%b_%d_%Y_%H_%M_%S", &end_tm))
218 *result = make_message("%lli-%lli.%s-%s", (long long) start, (long long) end,
223 __malloc char *name_of_newest_complete_snapshot(struct snapshot_list *sl)
229 FOR_EACH_SNAPSHOT_REVERSE(s, i, sl) {
230 if (s->flags != SS_COMPLETE) /* incomplete or being deleted */
232 name = dss_strdup(s->name);