Move libsandbox to its own directory.

Signed-off-by: Martin Schlemmer <azarah@gentoo.org>

1 files changed, 180 insertions, 0 deletions

diff --git a/libsandbox/canonicalize.c b/libsandbox/canonicalize.c
new file mode 100644
index 0000000..c23ae7c
--- /dev/null
+++ b/libsandbox/canonicalize.c
@@ -0,0 +1,180 @@
+/* Return the canonical absolute name of a given file.
+   Copyright (C) 1996-2001, 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   The GNU C 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 the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/*
+ * $Header$
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <stddef.h>
+
+#include "config.h"
+#include "localdecls.h"
+
+#include "sbutil.h"
+
+#ifndef __set_errno
+# define __set_errno(val) errno = (val)
+#endif
+
+/* Return the canonical absolute name of file NAME.  A canonical name
+   does not contain any `.', `..' components nor any repeated path
+   separators ('/') or symlinks.  All path components must exist.  If
+   RESOLVED is null, the result is malloc'd; otherwise, if the
+   canonical name is SB_PATH_MAX chars or more, returns null with `errno'
+   set to ENAMETOOLONG; if the name fits in fewer than SB_PATH_MAX chars,
+   returns the name in RESOLVED.  If the name cannot be resolved and
+   RESOLVED is non-NULL, it contains the path of the first component
+   that cannot be resolved.  If the path can be resolved, RESOLVED
+   holds the same value as the value returned.	*/
+
+/* Modified: 19 Aug 2002; Martin Schlemmer <azarah@gentoo.org>
+ * 
+ *  Cleaned up unneeded stuff, and change so that it will not
+ *  resolve symlinks.  Also prepended a 'e' to functions that
+ *  I did not rip out.
+ *  
+ */
+
+char *
+erealpath(const char *name, char *resolved)
+{
+	char *rpath, *dest;
+	const char *start, *end, *rpath_limit;
+	long int path_max;
+
+	if (name == NULL) {
+		/* As per Single Unix Specification V2 we must return an error if
+		   either parameter is a null pointer.	We extend this to allow
+		   the RESOLVED parameter to be NULL in case the we are expected to
+		   allocate the room for the return value.  */
+		__set_errno(EINVAL);
+		return NULL;
+	}
+
+	if (name[0] == '\0') {
+		/* As per Single Unix Specification V2 we must return an error if
+		   the name argument points to an empty string.  */
+		__set_errno(ENOENT);
+		return NULL;
+	}
+#ifdef SB_PATH_MAX
+	path_max = SB_PATH_MAX;
+#else
+	path_max = pathconf(name, _PC_PATH_MAX);
+	if (path_max <= 0)
+		path_max = 1024;
+#endif
+
+	if (resolved == NULL) {
+		rpath = malloc(path_max);
+		if (rpath == NULL)
+			return NULL;
+	} else
+		rpath = resolved;
+	rpath_limit = rpath + path_max;
+
+	if (name[0] != '/') {
+		if (!egetcwd(rpath, path_max)) {
+			rpath[0] = '\0';
+			goto error;
+		}
+		dest = strchr(rpath, '\0');
+	} else {
+		rpath[0] = '/';
+		dest = rpath + 1;
+	}
+
+	for (start = end = name; *start; start = end) {
+		/* Skip sequence of multiple path-separators.  */
+		while (*start == '/')
+			++start;
+
+		/* Find end of path component.	*/
+		for (end = start; *end && *end != '/'; ++end)
+			/* Nothing.  */ ;
+
+		if (end - start == 0)
+			break;
+		else if (end - start == 1 && start[0] == '.')
+			/* nothing */ ;
+		else if (end - start == 2 && start[0] == '.' && start[1] == '.') {
+			/* Back up to previous component, ignore if at root already.  */
+			if (dest > rpath + 1)
+				while ((--dest)[-1] != '/') ;
+		} else {
+			size_t new_size;
+
+			if (dest[-1] != '/')
+				*dest++ = '/';
+
+			if (dest + (end - start) >= rpath_limit) {
+				ptrdiff_t dest_offset = dest - rpath;
+				char *new_rpath;
+
+				if (resolved) {
+					__set_errno(ENAMETOOLONG);
+					if (dest > rpath + 1)
+						dest--;
+					*dest = '\0';
+					goto error;
+				}
+				new_size = rpath_limit - rpath;
+				if (end - start + 1 > path_max)
+					new_size += end - start + 1;
+				else
+					new_size += path_max;
+				new_rpath = (char *) realloc(rpath, new_size);
+				if (new_rpath == NULL)
+					goto error;
+				rpath = new_rpath;
+				rpath_limit = rpath + new_size;
+
+				dest = rpath + dest_offset;
+			}
+
+			memcpy(dest, start, end - start);
+			dest += end - start;
+			*dest = '\0';
+		}
+	}
+#if 1
+	if (dest > rpath + 1 && dest[-1] == '/')
+		--dest;
+#endif
+	*dest = '\0';
+
+	return resolved ? rpath : memcpy(resolved, rpath, dest - rpath + 1);
+
+error:
+	if (resolved)
+		snprintf(resolved, path_max, "%s", rpath);
+	else
+		free(rpath);
+	return NULL;
+}
+
+// vim:noexpandtab noai:cindent ai