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authorRoland McGrath <roland@gnu.org>1996-05-23 03:15:42 +0000
committerRoland McGrath <roland@gnu.org>1996-05-23 03:15:42 +0000
commitfa0bc87c32d02cd81ec4d0ae00e0d943c683e6e1 (patch)
tree197250e2e9e1f2c900d3bf042dbf14898dc0fb73 /stdlib/canonicalize.c
parente685238c901f1a7aa0c1956e63cc9f2de5599998 (diff)
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Wed May 22 22:10:01 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* stdlib/canonicalize.c: New file. * stdlib/stdlib.h: Declare canonicalize_file_name, realpath. * stdlib/Makefile (routines): Add canonicalize. * posix/unistd.h: Declare __canonicalize_directory_name_internal. Thu May 23 00:01:10 1996 Ulrich Drepper <drepper@cygnus.com> * db/recno/rec_seq.c: Prevent `sccsid' definition by using the same #if condition as in the other db files. * intl/Makefile: Add -Wno-unused CFLAGS for compilation of bindtextdom.c, finddomain.c, and localealias.c. * intl/dcgettext.c: Don't define prototype for getcwd() when compiling in glibc. * libio/cleanup.c: Add prototype for _IO_register_cleanup. * libio/filedoalloc.c, libio/fileops.c, libio/iopopen.c: Don't define _POSIX_SOURCE unconditionally. * libio/filedoalloc.c, libio/iopopen.c: Include <unistd.h> if compiling in glibc. * libio/fileops.c (_IO_file_close_it): Don't sync file, call flush instead. This relaxes the rules from POSIX.1 about changing the active handle a bit. * libio/iofopncook.c (struct _IO_cookie_file): Move definition into <libio.h>. Add prototypes for local functions to prevent warnings. * libio/iopopen.c: Change prototypes for _IO_fork, _IO_pipe, and _IO_DUP2 to contain complete parameter list. * libio/libio.h: Add definition of struct _IO_cookie_file. * libio/libioP.h: Add prototypes for _IO_vasprintf, _IO_vdprintf, and _IO_vsnprintf. * libio/memstream.c: Include <stdio.h>. * libio/stdio.h: Add prototypes for fopencookie, __stdio_gen_tempname, __vfscanf, __vsscanf, and __vsnprintf. * libio/strops.c: Avoid useless expression in `for' initializer. * locale/findlocale.c: Add some casts to prevent warnings. * locale/programs/locfile.c (write_locale_data): Don't use double `/' in locale binary file. * posix/unistd.h: Remove prototype for `reboot'. Update from bind-4.9.4-T1A. * resolv/Makefile (routines): Add inet_ntop and inet_pton. * resolv/arpa/nameser.h: Add definition of IN6ADDRSZ. * resolv/gethnamaddr.c, resolv/getnetnamadr.c, resolv/res_comp.c, resolv/res_debug.c, resolv/res_init.c * resolv/inet_ntop.c, resolv/inet_pton.c: New files. * resolv/resolv.h: Add RES_USE_INET6 flag. (__dn_isvalid): Renamed to __res_dnok. Add prototypes for __res_ownok and __res_mailok. * stdio-common/Makefile: Add -Wno-unused to CFLAGS for _itoa.c. * stdio-common/getline.c, stdio-common/vfscanf.c, sysdeps/posix/tempname.c: Don't use <ansidecl.h> anymore. * sysdeps/unix/sysv/linux/Makefile [$subdir == misc] (sysdep_routines): Add s_reboot. (install-others): Add $(includedir)/sys/syscall.h. New rule for $(includedir)/sys/syscall.h to produce from <asm/unistd.h>. * sysdeps/unix/sysv/linux/reboot.c: New file. Make single argument function call 3 argument system call. * sysdeps/unix/sysv/linux/sys/reboot.h: New file. Linux specific definition for reboot function. * sysdeps/unix/sysv/linux/syscall.h: Remove old and obsolete comment. * sysdeps/unix/sysv/linux/syscalls.list: Rename function for reboot syscall to __syscall_reboot. * wcsmbs/wchar.h: Protect prototypes for wcstof and wcstold by __USE_GNU, not USE_GNU. Tue May 21 21:55:49 1996 David Mosberger-Tang <davidm@AZStarNet.com> * locale/programs/charset.c, locale/programs/ld-collate.c: Add casts to prevent warnings on 64-bit machines. * locale/programs/ld-monetary.c: Don't do unnecessary tests for int_frac_digits and frac_digits which only produce warnings. Mon May 13 23:45:29 1996 David Mosberger-Tang <davidm@AZStarNet.com> * inet/arpa/inet.h: Backup return type of inet_addr to u_long. * resolv/inet_addr.c: Likewise. * resolv/Makefile (distribute): Add res_hconf.h (routines): Add res_hconf. * resolv/gethnamaddr.c: Add support for /etc/host.conf. * resolv/res_init.c: Initialize /etc/host.conf reader. * resolv/res_hconf.c, resolv/res_hconf.h: New files. Implementation of reading /etc/host.conf. Wed May 22 21:21:15 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu> * Rules (%.out rules): Prepend $($*-ENV) to the command. * sysdeps/unix/sysv/linux/i386/brk.c (___brk_addr): Define as weak alias for __curbrk. Wed May 22 19:37:27 1996 Miles Bader <miles@gnu.ai.mit.edu> * hurd/hurdexec.c (_hurd_exec): Pass INIT_TRACEMASK. * hurd/hurdmsg.c (set_int): Support INIT_TRACEMASK. Wed May 22 18:47:31 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu> * sysdeps/mach/hurd/getcwd.c (_hurd_canonicalize_directory_name_internal): New function, broken out of __getcwd. (__getcwd): Use it. (__canonicalize_directory_name_internal): New function using it. * sysdeps/posix/getcwd.c (__canonicalize_directory_name_internal): New function, broken out of __getcwd. (__getcwd): Use it. Wed May 22 18:14:05 1996 Miles Bader <miles@gnu.ai.mit.edu> * string/argz-create.c (__argz_create): Correctly calculate length. * string/argz-extract.c (__argz_extract): Add terminating 0 entry. * hurd/hurdstartup.c (_hurd_startup): ... and don't so here. [HAVE_VMSDIR_H]: Include "vmsdir.h". (glob) [VMS]: Don't grok ~.
Diffstat (limited to 'stdlib/canonicalize.c')
-rw-r--r--stdlib/canonicalize.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/stdlib/canonicalize.c b/stdlib/canonicalize.c
new file mode 100644
index 0000000..55ac1bc
--- /dev/null
+++ b/stdlib/canonicalize.c
@@ -0,0 +1,196 @@
+/* Return the canonical absolute name of a given file.
+Copyright (C) 1996 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+/* Return the canonical absolute name of file NAME. The last file name
+ component need not exist, and may be a symlink to a nonexistent file.
+ 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. */
+
+static char *
+canonicalize (const char *name, char *resolved)
+{
+ struct stat st;
+ const char *p;
+ long int path_max;
+ char *result, *dir, *end;
+ size_t namelen;
+
+ if (! resolved)
+ path_max = 0;
+ else
+ {
+#ifdef PATH_MAX
+ path_max = PATH_MAX;
+#else
+ path_max = sysconf (_SC_PATH_MAX);
+ if (path_max <= 0)
+ path_max = 1024;
+#endif
+ }
+
+ p = strrchr (name, '/');
+ if (!p)
+ {
+ dir = (char *) ".";
+ p = name;
+ }
+ else
+ {
+ if (p++ == name)
+ dir = (char *) "/";
+ else
+ {
+ dir = __alloca (p - name);
+ memcpy (dir, name, p - name - 1);
+ dir[p - name] = '\0';
+ }
+ }
+
+ result = __canonicalize_directory_name_internal (dir, resolved, path_max);
+ if (!result)
+ return NULL;
+
+ /* Reconstruct the file name in the canonicalized directory. */
+ namelen = strlen (name);
+ end = strchr (result, '\0');
+ if (resolved)
+ {
+ /* Make sure the name is not too long. */
+ if (end - result + namelen > path_max)
+ {
+ errno = ENAMETOOLONG;
+ return NULL;
+ }
+ }
+ else
+ {
+ /* The name is dynamically allocated. Extend it. */
+ char *new = realloc (result, end - result + namelen + 1);
+ if (! new)
+ {
+ free (result);
+ return NULL;
+ }
+ end = new + (end - result);
+ result = new;
+ }
+ memcpy (end, name, namelen + 1);
+
+ while (__lstat (result, &st) == 0 && S_ISLNK (st.st_mode))
+ {
+ /* The file is a symlink. Read its contents. */
+ ssize_t n;
+ read_link_contents:
+ n = readlink (result, end,
+ resolved ? result + path_max - end : namelen + 1);
+ if (n < 0)
+ /* Error reading the link contents. */
+ return NULL;
+
+ if (end[0] == '/')
+ {
+ /* Absolute symlink. */
+ if (resolved ? (end + n < result + path_max) : (n < namelen + 1))
+ {
+ /* It fit in our buffer, so we have the whole thing. */
+ memcpy (result, end, n);
+ result[n] = '\0';
+ }
+ else if (resolved)
+ {
+ /* It didn't fit in the remainder of the buffer. Either it
+ fits in the entire buffer, or it doesn't. Copy back the
+ unresolved name onto the canonical directory and try once
+ more. */
+ memcpy (end, name, namelen + 1);
+ n = readlink (result, result, path_max);
+ if (n < 0)
+ return NULL;
+ if (n == path_max)
+ {
+ errno = ENAMETOOLONG;
+ return NULL;
+ }
+ result[n] = '\0';
+ }
+ else
+ /* Try again with a bigger buffer. */
+ goto extend_buffer;
+
+ /* Check the resolved name for being a symlink too. */
+ continue;
+ }
+
+ if (resolved)
+ {
+ if (end + n == result + path_max)
+ {
+ /* The link contents we read fill the buffer completely.
+ There may be even more to read, and there is certainly no
+ space for the null terminator. */
+ errno = ENAMETOOLONG;
+ return NULL;
+ }
+ }
+ else if (n == namelen + 1)
+ extend_buffer:
+ {
+ /* The name buffer is dynamically allocated. Extend it. */
+ char *new;
+
+ /* Copy back the unresolved name onto the canonical directory. */
+ memcpy (end, name, namelen + 1);
+
+ /* Make more space for readlink. */
+ namelen *= 2;
+ new = realloc (result, end - result + namelen + 1);
+ if (! new)
+ {
+ free (result);
+ return NULL;
+ }
+ end = new + (end - result);
+ result = new;
+
+ goto read_link_contents;
+ }
+
+ /* Terminate the string; readlink does not. */
+ end[n] = '\0';
+ }
+
+ return result;
+}
+
+weak_alias (canonicalize, realpath)
+
+char *
+canonicalize_file_name (const char *name)
+{
+ return canonicalize (name, NULL);
+}