From fa0bc87c32d02cd81ec4d0ae00e0d943c683e6e1 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Thu, 23 May 1996 03:15:42 +0000 Subject: Wed May 22 22:10:01 1996 Roland McGrath * 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 * 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 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 . 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 . * 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 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 . * 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 * 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 * 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 * 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 * 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 * 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 * 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 ~. --- stdlib/canonicalize.c | 196 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 196 insertions(+) create mode 100644 stdlib/canonicalize.c (limited to 'stdlib/canonicalize.c') diff --git a/stdlib/canonicalize.c b/stdlib/canonicalize.c new file mode 100644 index 0000000000..55ac1bcf1d --- /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 +#include +#include +#include +#include +#include + +/* 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); +} -- cgit v1.2.3