1 files changed, 68 insertions, 0 deletions
diff --git a/src/sysfs.c b/src/sysfs.c
new file mode 100644
index 0000000..f2c616e
--- /dev/null
+++ b/src/sysfs.c
@@ -0,0 +1,68 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+/**
+ * sysfs_path_is_file: Check if the path supplied points to a file
+ * @path: path to validate
+ * Returns 0 if path points to file, 1 otherwise
+ * Copied from sysfsutils-2.1.0 (which is LGPL2.1 or later), relicensed GPLv2 for use here.
+ */
+int sysfs_path_is_file(const char * path)
+{
+        struct stat astats;
+
+        if (!path) {
+                errno = EINVAL;
+                return 1;
+        }
+        if ((lstat(path, &astats)) != 0) {
+                return 1;
+        }
+        if (S_ISREG(astats.st_mode))
+                return 0;
+
+        return 1;
+}
+
+int sysfs_read_file(const char * path, char **output)
+{
+	int ret;
+	char *result = NULL;
+	int fd;
+	unsigned long resultsize = 0;
+	ssize_t length = 0;
+
+	resultsize = getpagesize();
+	result = malloc(resultsize);
+	if (!result)
+		return -ENOMEM;
+	memset(result, 0, resultsize);
+
+	fd = open(path, O_RDONLY);
+	if (fd < 0) {
+		ret = fd;
+		goto free_out;
+	}
+
+	length = read(fd, result, resultsize-1);
+	if (length < 0) {
+		close(fd);
+		ret = -1;
+		goto free_out;
+	}
+	result[length] = '\0';
+	if (result[length-1] == '\n')
+		result[length-1] = '\0';
+	*output = result;
+	ret = 0;
+	goto out;
+free_out:
+	free(result);
+out:
+	return ret;
+}