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Pekka Paalanen899b50b2015-02-12 12:52:21 +02001/*
2 * Copyright © 2015 Collabora, Ltd.
3 *
Bryce Harrington6c6164c2015-06-11 14:20:17 -07004 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
Pekka Paalanen899b50b2015-02-12 12:52:21 +020011 *
Bryce Harrington6c6164c2015-06-11 14:20:17 -070012 * The above copyright notice and this permission notice (including the
13 * next paragraph) shall be included in all copies or substantial
14 * portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
20 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
Pekka Paalanen899b50b2015-02-12 12:52:21 +020024 */
25
26#include "config.h"
27
28#include <stdio.h>
29#include <errno.h>
30#include <time.h>
31#include <sys/types.h>
32#include <sys/stat.h>
33#include <fcntl.h>
Derek Foreman83b900f2018-02-06 15:18:36 -060034#include <stdlib.h>
Pekka Paalanen899b50b2015-02-12 12:52:21 +020035
36#include "file-util.h"
37
38static int
39current_time_str(char *str, size_t len, const char *fmt)
40{
41 time_t t;
42 struct tm *t_local;
43 int ret;
44
45 t = time(NULL);
46 t_local = localtime(&t);
47 if (!t_local) {
48 errno = ETIME;
49 return -1;
50 }
51
52 ret = strftime(str, len, fmt, t_local);
53 if (ret == 0) {
54 errno = ETIME;
55 return -1;
56 }
57
58 return ret;
59}
60
61static int
62create_file_excl(const char *fname)
63{
64 return open(fname, O_RDWR | O_CLOEXEC | O_CREAT | O_EXCL, 00666);
65}
66
67/** Create a unique file with date and time in the name
68 *
Aleksander Morgado72032ac2018-01-23 01:05:21 +010069 * \param path File path
70 * \param prefix File name prefix.
Pekka Paalanen899b50b2015-02-12 12:52:21 +020071 * \param suffix File name suffix.
Marius Vlad48392642019-06-14 13:04:52 +030072 * \param[out] name_out Buffer for the resulting file name.
Pekka Paalanen899b50b2015-02-12 12:52:21 +020073 * \param name_len Number of bytes usable in name_out.
74 * \return stdio FILE pointer, or NULL on failure.
75 *
76 * Create and open a new file with the name concatenated from
Aleksander Morgado72032ac2018-01-23 01:05:21 +010077 * path/prefix, date and time, and suffix. If a file with this name
Pekka Paalanen899b50b2015-02-12 12:52:21 +020078 * already exists, an counter number is added to the end of the
79 * date and time sub-string. The counter is increased until a free file
80 * name is found.
81 *
82 * Once creating the file succeeds, the name of the file is in name_out.
83 * On failure, the contents of name_out are undefined and errno is set.
84 */
85FILE *
Aleksander Morgado72032ac2018-01-23 01:05:21 +010086file_create_dated(const char *path, const char *prefix, const char *suffix,
Pekka Paalanen899b50b2015-02-12 12:52:21 +020087 char *name_out, size_t name_len)
88{
89 char timestr[128];
90 int ret;
91 int fd;
92 int cnt = 0;
Aleksander Morgado72032ac2018-01-23 01:05:21 +010093 int with_path;
94
95 with_path = path && path[0];
Pekka Paalanen899b50b2015-02-12 12:52:21 +020096
97 if (current_time_str(timestr, sizeof(timestr), "%F_%H-%M-%S") < 0)
98 return NULL;
99
Aleksander Morgado72032ac2018-01-23 01:05:21 +0100100 ret = snprintf(name_out, name_len, "%s%s%s%s%s",
101 with_path ? path : "", with_path ? "/" : "",
102 prefix, timestr, suffix);
Pekka Paalanen899b50b2015-02-12 12:52:21 +0200103 if (ret < 0 || (size_t)ret >= name_len) {
104 errno = ENOBUFS;
105 return NULL;
106 }
107
108 fd = create_file_excl(name_out);
109
110 while (fd == -1 && errno == EEXIST) {
111 cnt++;
112
Aleksander Morgado72032ac2018-01-23 01:05:21 +0100113 ret = snprintf(name_out, name_len, "%s%s%s%s-%d%s",
114 with_path ? path : "", with_path ? "/" : "",
115 prefix, timestr, cnt, suffix);
Pekka Paalanen899b50b2015-02-12 12:52:21 +0200116 if (ret < 0 || (size_t)ret >= name_len) {
117 errno = ENOBUFS;
118 return NULL;
119 }
120
121 fd = create_file_excl(name_out);
122 }
123
124 if (fd == -1)
125 return NULL;
126
127 return fdopen(fd, "w");
128}
Derek Foreman83b900f2018-02-06 15:18:36 -0600129
130char *
131file_name_with_datadir(const char *filename)
132{
133 const char *base = getenv("WESTON_DATA_DIR");
134 char *out;
135 int len;
136
137 if (base)
138 len = asprintf(&out, "%s/%s", base, filename);
139 else
140 len = asprintf(&out, "%s/weston/%s", DATADIR, filename);
141
142 if (len == -1)
143 return NULL;
144
145 return out;
146}