1 /**
2 * RRDtool - src/rrd_utils.c
3 * Copyright (C) 2009 Kevin Brintnall
4 * Copyright (C) 2008 Sebastian Harl
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; only version 2 of the License is applicable.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * kevin brintnall <kbrint@rufus.net>
21 * Sebastian Harl <sh@tokkee.org>
22 **/
24 #include "rrd_tool.h"
26 #include <assert.h>
27 #include <errno.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/types.h>
31 #include <sys/stat.h>
32 #ifndef _MSC_VER
33 #include <libgen.h>
34 #include <unistd.h>
35 #endif
36 #ifdef WIN32
37 # define random() rand()
38 # define srandom(x) srand(x)
39 # define getpid() 0
40 #endif /* WIN32 */
42 #ifndef S_ISDIR
43 #define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
44 #endif
46 /* make sure that the random number generator seeded EXACTLY ONCE */
47 long rrd_random(void)
48 {
49 static int rand_init = 0;
50 if (!rand_init) {
51 srandom((unsigned int) time(NULL) + (unsigned int) getpid());
52 rand_init++;
53 }
55 return random();
56 }
58 /* rrd_add_ptr: add a pointer to a dynamically sized array of pointers,
59 * realloc as necessary. returns 1 on success, 0 on failure.
60 */
62 int rrd_add_ptr(void ***dest, size_t *dest_size, void *src)
63 {
64 void **temp;
66 assert(dest != NULL);
68 temp = (void **) rrd_realloc(*dest, (*dest_size+1) * sizeof(*dest));
69 if (!temp)
70 return 0;
72 *dest = temp;
73 temp[*dest_size] = src;
74 (*dest_size)++;
76 return 1;
77 }
79 /* like rrd_add_ptr, but calls strdup() on a string first. */
80 int rrd_add_strdup(char ***dest, size_t *dest_size, char *src)
81 {
82 char *dup_src;
83 int add_ok;
85 assert(dest != NULL);
86 assert(src != NULL);
88 dup_src = strdup(src);
89 if (!dup_src)
90 return 0;
92 add_ok = rrd_add_ptr((void ***)dest, dest_size, (void *)dup_src);
93 if (!add_ok)
94 free(dup_src);
96 return add_ok;
97 }
99 void rrd_free_ptrs(void ***src, size_t *cnt)
100 {
101 void **sp;
103 assert(src != NULL);
104 sp = *src;
106 if (sp == NULL)
107 return;
109 while (*cnt > 0) {
110 (*cnt)--;
111 free(sp[*cnt]);
112 }
114 free (sp);
115 *src = NULL;
116 }
118 /* recursively create the directory named by 'pathname'
119 * (similar to "mkdir -p" on the command line) */
120 int rrd_mkdir_p(const char *pathname, mode_t mode)
121 {
122 struct stat sb;
124 char *pathname_copy;
125 char *base_dir;
127 if ((NULL == pathname) || ('\0' == *pathname)) {
128 errno = EINVAL;
129 return -1;
130 }
132 if (0 == stat(pathname, &sb)) {
133 if (! S_ISDIR(sb.st_mode)) {
134 errno = ENOTDIR;
135 return -1;
136 }
137 return 0;
138 }
140 /* keep errno as set by stat() */
141 if (ENOENT != errno)
142 return -1;
144 /* dirname might modify its first argument */
145 if (NULL == (pathname_copy = strdup(pathname)))
146 return -1;
148 #ifndef _MSC_VER
149 /* the data pointedd too by dirname might change too (bsd) */
150 if (NULL == (base_dir = strdup(dirname(pathname_copy)))) {
151 free(pathname_copy);
152 return -1;
153 }
154 #else
155 _splitpath(pathname_copy, NULL, base_dir, NULL, NULL);
156 #endif
158 if (0 != rrd_mkdir_p(base_dir, mode)) {
159 int orig_errno = errno;
160 free(pathname_copy);
161 #ifndef _MSC_VER
162 free(base_dir);
163 #endif
164 errno = orig_errno;
165 return -1;
166 }
168 free(pathname_copy);
169 #ifndef _MSC_VER
170 free(base_dir);
171 #endif
173 /* keep errno as set by mkdir() */
174 #ifdef _MSC_VER
175 if (0 != mkdir(pathname))
176 return -1;
177 #else
178 if (0 != mkdir(pathname, mode))
179 return -1;
180 #endif
181 return 0;
182 } /* rrd_mkdir_p */