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author | Jason Stubbs <jstubbs@gentoo.org> | 2005-08-28 08:37:44 +0000 |
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committer | Jason Stubbs <jstubbs@gentoo.org> | 2005-08-28 08:37:44 +0000 |
commit | d9fc4acc572c6647a4f27b838d35d27d805d190e (patch) | |
tree | 262a8de35d8c7567312757da5f1f66efdc8cece5 /src/sandbox-dev/canonicalize.c | |
download | portage-d9fc4acc572c6647a4f27b838d35d27d805d190e.tar.gz portage-d9fc4acc572c6647a4f27b838d35d27d805d190e.tar.bz2 portage-d9fc4acc572c6647a4f27b838d35d27d805d190e.zip |
Migration (without history) of the current stable line to subversion.
svn path=/main/branches/2.0/; revision=1941
Diffstat (limited to 'src/sandbox-dev/canonicalize.c')
-rw-r--r-- | src/sandbox-dev/canonicalize.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/sandbox-dev/canonicalize.c b/src/sandbox-dev/canonicalize.c new file mode 100644 index 000000000..7ecd57ec6 --- /dev/null +++ b/src/sandbox-dev/canonicalize.c @@ -0,0 +1,194 @@ +/* Return the canonical absolute name of a given file. + Copyright (C) 1996, 1997, 1998, 1999, 2000 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: /var/cvsroot/gentoo-src/portage/src/sandbox-dev/Attic/canonicalize.c,v 1.2 2002/08/26 03:28:30 azarah Exp $ + */ + +#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> + +#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 PATH_MAX chars or more, returns null with `errno' + set to ENAMETOOLONG; if the name fits in fewer than 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. + * + */ + +static char * +ecanonicalize (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 PATH_MAX + path_max = PATH_MAX; +#else + path_max = pathconf (name, _PC_PATH_MAX); + if (path_max <= 0) + path_max = 1024; +#endif + + rpath = resolved ? alloca (path_max) : malloc (path_max); + rpath_limit = rpath + path_max; + + if (name[0] != '/') + { + if (!getcwd (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; + + 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; + rpath = realloc (rpath, new_size); + rpath_limit = rpath + new_size; + if (rpath == NULL) + return NULL; + + dest = rpath + dest_offset; + } + + dest = __mempcpy (dest, start, end - start); + *dest = '\0'; + + } + } +#if 0 + if (dest > rpath + 1 && dest[-1] == '/') + --dest; +#endif + *dest = '\0'; + + return resolved ? memcpy (resolved, rpath, dest - rpath + 1) : rpath; + +error: + if (resolved) + strcpy (resolved, rpath); + else + free (rpath); + return NULL; +} + + +char * +erealpath (const char *name, char *resolved) +{ + if (resolved == NULL) + { + __set_errno (EINVAL); + return NULL; + } + + return ecanonicalize (name, resolved); +} + + +// vim:expandtab noai:cindent ai |