X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=discover%2Ffile.c;fp=discover%2Ffile.c;h=269421cb8d02c727fb33fd607506d9c67d83710f;hb=a70807730ef59efc4116556ecabe1b9f70ce605b;hp=0000000000000000000000000000000000000000;hpb=bee85b3946d50bc4ee02ab889f4b3a9cd0defe98;p=petitboot

diff --git a/discover/file.c b/discover/file.c
new file mode 100644
index 0000000..269421c
--- /dev/null
+++ b/discover/file.c
@@ -0,0 +1,77 @@
+/*
+ *  Copyright (C) 2013 Jeremy Kerr <jk@ozlabs.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <talloc/talloc.h>
+
+#include "file.h"
+
+static const int max_file_size = 1024 * 1024;
+
+int read_file(void *ctx, const char *filename, char **bufp, int *lenp)
+{
+	struct stat statbuf;
+	int rc, fd, i, len;
+	char *buf;
+
+	fd = open(filename, O_RDONLY);
+	if (fd < 0)
+		return -1;
+
+	rc = fstat(fd, &statbuf);
+	if (rc < 0)
+		goto err_close;
+
+	len = statbuf.st_size;
+	if (len > max_file_size)
+		goto err_close;
+
+	buf = talloc_array(ctx, char, len + 1);
+	if (!buf)
+		goto err_close;
+
+	for (i = 0; i < len; i += rc) {
+		rc = read(fd, buf + i, len - i);
+
+		/* unexpected EOF: trim and return */
+		if (rc == 0) {
+			len = i;
+			break;
+		}
+
+		if (rc < 0)
+			goto err_free;
+
+	}
+
+	buf[len] = '\0';
+
+	close(fd);
+	*bufp = buf;
+	*lenp = len;
+	return 0;
+
+err_free:
+	talloc_free(buf);
+err_close:
+	close(fd);
+	return -1;
+}