2 * Copyright (C) 2013 Jeremy Kerr <jk@ozlabs.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <sys/types.h>
25 #include <talloc/talloc.h>
29 static const int max_file_size = 1024 * 1024;
31 int read_file(void *ctx, const char *filename, char **bufp, int *lenp)
37 fd = open(filename, O_RDONLY);
41 rc = fstat(fd, &statbuf);
45 len = statbuf.st_size;
46 if (len > max_file_size)
49 buf = talloc_array(ctx, char, len + 1);
53 for (i = 0; i < len; i += rc) {
54 rc = read(fd, buf + i, len - i);
56 /* unexpected EOF: trim and return */
81 static int write_fd(int fd, char *buf, int len)
85 for (i = 0; i < len; i += rc) {
86 rc = write(fd, buf + i, len - i);
87 if (rc < 0 && errno != -EINTR)
94 int replace_file(const char *filename, char *buf, int len)
100 tempfile = talloc_asprintf(NULL, "%s.XXXXXX", filename);
102 oldmask = umask(0644);
103 fd = mkstemp(tempfile);
106 talloc_free(tempfile);
110 rc = write_fd(fd, buf, len);
114 rc = rename(tempfile, filename);
117 talloc_free(tempfile);