Fully integrate libsysfs into NetNuke (it compiles and links correctly)

1 files changed, 307 insertions, 0 deletions

diff --git a/libsysfs/sysfs_utils.c b/libsysfs/sysfs_utils.c
new file mode 100644
index 0000000..9ca207c
--- /dev/null
+++ b/libsysfs/sysfs_utils.c
@@ -0,0 +1,307 @@
+/*
+ * sysfs_utils.c
+ *
+ * System utility functions for libsysfs
+ *
+ * Copyright (C) IBM Corp. 2003-2005
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "libsysfs.h"
+#include "sysfs.h"
+
+/**
+ * sysfs_remove_trailing_slash: Removes any trailing '/' in the given path
+ * @path: Path to look for the trailing '/'
+ * Returns 0 on success 1 on error
+ */
+int sysfs_remove_trailing_slash(char *path)
+{
+	size_t len;
+
+	if (!path) {
+		errno = EINVAL;
+		return 1;
+	}
+
+	len = strlen(path);
+	while (len > 0 && path[len-1] == '/')
+		path[--len] = '\0';
+	return 0;
+}
+
+/*
+ * sysfs_get_mnt_path: Gets the sysfs mount point.
+ * @mnt_path: place to put "sysfs" mount point
+ * @len: size of mnt_path
+ * returns 0 with success and -1 with error.
+ */
+int sysfs_get_mnt_path(char *mnt_path, size_t len)
+{
+	static char sysfs_path[SYSFS_PATH_MAX] = "";
+	const char *sysfs_path_env;
+
+	if (len == 0 || mnt_path == NULL)
+		return -1;
+
+	/* evaluate only at the first call */
+	if (sysfs_path[0] == '\0') {
+		/* possible overrride of real mount path */
+		sysfs_path_env = getenv(SYSFS_PATH_ENV);
+		if (sysfs_path_env != NULL) {
+			safestrcpymax(mnt_path, sysfs_path_env, len);
+			sysfs_remove_trailing_slash(mnt_path);
+			return 0;
+		}
+		safestrcpymax(mnt_path, SYSFS_MNT_PATH, len);
+	}
+
+	return 0;
+}
+
+/**
+ * sysfs_get_name_from_path: returns last name from a "/" delimited path
+ * @path: path to get name from
+ * @name: where to put name
+ * @len: size of name
+ */
+int sysfs_get_name_from_path(const char *path, char *name, size_t len)
+{
+	char tmp[SYSFS_PATH_MAX];
+	char *n = NULL;
+
+	if (!path || !name || len == 0) {
+		errno = EINVAL;
+		return -1;
+	}
+	memset(tmp, 0, SYSFS_PATH_MAX);
+	safestrcpy(tmp, path);
+	n = strrchr(tmp, '/');
+	if (n == NULL) {
+		errno = EINVAL;
+		return -1;
+	}
+	if (*(n+1) == '\0') {
+		*n = '\0';
+		n = strrchr(tmp, '/');
+		if (n == NULL) {
+			errno = EINVAL;
+			return -1;
+		}
+	}
+	n++;
+	safestrcpymax(name, n, len);
+	return 0;
+}
+
+/**
+ * sysfs_get_link: returns link source
+ * @path: symbolic link's path
+ * @target: where to put name
+ * @len: size of name
+ */
+int sysfs_get_link(const char *path, char *target, size_t len)
+{
+	char devdir[SYSFS_PATH_MAX];
+	char linkpath[SYSFS_PATH_MAX];
+	char temp_path[SYSFS_PATH_MAX];
+	char *d = NULL, *s = NULL;
+	int slashes = 0, count = 0;
+
+	if (!path || !target || len == 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	memset(devdir, 0, SYSFS_PATH_MAX);
+	memset(linkpath, 0, SYSFS_PATH_MAX);
+	memset(temp_path, 0, SYSFS_PATH_MAX);
+	safestrcpy(devdir, path);
+
+	if ((readlink(path, linkpath, SYSFS_PATH_MAX)) < 0) {
+		return -1;
+	}
+	d = linkpath;
+	/*
+	 * Three cases here:
+	 * 1. relative path => format ../..
+	 * 2. absolute path => format /abcd/efgh
+	 * 3. relative path _from_ this dir => format abcd/efgh
+	 */
+	switch (*d) {
+		case '.':
+			/*
+			 * handle the case where link is of type ./abcd/xxx
+			 */
+			safestrcpy(temp_path, devdir);
+			if (*(d+1) == '/')
+				d += 2;
+			else if (*(d+1) == '.')
+				goto parse_path;
+			s = strrchr(temp_path, '/');
+			if (s != NULL) {
+				*(s+1) = '\0';
+				safestrcat(temp_path, d);
+			} else {
+				safestrcpy(temp_path, d);
+			}
+			safestrcpymax(target, temp_path, len);
+			break;
+			/*
+			 * relative path, getting rid of leading "../.."
+			 */
+parse_path:
+			while (*d == '/' || *d == '.') {
+				if (*d == '/')
+					slashes++;
+				d++;
+			}
+			d--;
+			s = &devdir[strlen(devdir)-1];
+			while (s != NULL && count != (slashes+1)) {
+				s--;
+				if (*s == '/')
+					count++;
+			}
+			safestrcpymax(s, d, (SYSFS_PATH_MAX-strlen(devdir)));
+			safestrcpymax(target, devdir, len);
+			break;
+		case '/':
+			/* absolute path - copy as is */
+			safestrcpymax(target, linkpath, len);
+			break;
+		default:
+			/* relative path from this directory */
+			safestrcpy(temp_path, devdir);
+			s = strrchr(temp_path, '/');
+			if (s != NULL) {
+				*(s+1) = '\0';
+				safestrcat(temp_path, linkpath);
+			} else {
+				safestrcpy(temp_path, linkpath);
+			}
+			safestrcpymax(target, temp_path, len);
+	}
+	return 0;
+}
+
+/**
+ * sysfs_close_list: generic list free routine
+ * @list: dlist to free
+ * Returns nothing
+ */
+void sysfs_close_list(struct dlist *list)
+{
+	if (list)
+		dlist_destroy(list);
+}
+
+/**
+ * sysfs_open_directory_list: gets a list of all directories under "path"
+ * @path: path to read
+ * Returns a dlist of supported names or NULL no directories (errno is set
+ * 	in case of error
+ */
+struct dlist *sysfs_open_directory_list(const char *path)
+{
+	if (!path)
+		return NULL;
+
+	return (read_dir_subdirs(path));
+}
+
+/**
+ * sysfs_open_link_list: gets a list of all links under "path"
+ * @path: path to read
+ * Returns a dlist of supported links or NULL no directories (errno is set
+ * 	in case of error
+ */
+struct dlist *sysfs_open_link_list(const char *path)
+{
+	if (!path)
+		return NULL;
+
+	return (read_dir_links(path));
+}
+
+/**
+ * sysfs_path_is_dir: Check if the path supplied points to a directory
+ * @path: path to validate
+ * Returns 0 if path points to dir, 1 otherwise
+ */
+int sysfs_path_is_dir(const char *path)
+{
+	struct stat astats;
+
+	if (!path) {
+		errno = EINVAL;
+		return 1;
+	}
+	if ((lstat(path, &astats)) != 0) {
+		dprintf("stat() failed\n");
+		return 1;
+	}
+	if (S_ISDIR(astats.st_mode))
+		return 0;
+
+	return 1;
+}
+
+/**
+ * sysfs_path_is_link: Check if the path supplied points to a link
+ * @path: path to validate
+ * Returns 0 if path points to link, 1 otherwise
+ */
+int sysfs_path_is_link(const char *path)
+{
+	struct stat astats;
+
+	if (!path) {
+		errno = EINVAL;
+		return 1;
+	}
+	if ((lstat(path, &astats)) != 0) {
+		dprintf("stat() failed\n");
+		return 1;
+	}
+	if (S_ISLNK(astats.st_mode))
+		return 0;
+
+	return 1;
+}
+
+/**
+ * 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
+ */
+int sysfs_path_is_file(const char *path)
+{
+	struct stat astats;
+
+	if (!path) {
+		errno = EINVAL;
+		return 1;
+	}
+	if ((lstat(path, &astats)) != 0) {
+		dprintf("stat() failed\n");
+		return 1;
+	}
+	if (S_ISREG(astats.st_mode))
+		return 0;
+
+	return 1;
+}