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glibc/hurd/path-lookup.c
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/* Filename lookup using a search path | |
Copyright (C) 1995-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Written by Miles Bader <miles@gnu.ai.mit.edu> | |
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, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <string.h> | |
#include <hurd.h> | |
#include <hurd/lookup.h> | |
/* If FILE_NAME contains a '/', or PATH is NULL, call FUN with FILE_NAME, and | |
return the result (if PREFIXED_NAME is non-NULL, setting *PREFIXED_NAME to | |
NULL). Otherwise, call FUN repeatedly with FILE_NAME prefixed with each | |
successive `:' separated element of PATH, returning whenever FUN returns | |
0 (if PREFIXED_NAME is non-NULL, setting *PREFIXED_NAME to the resulting | |
prefixed path). If FUN never returns 0, return the first non-ENOENT | |
return value, or ENOENT if there is none. */ | |
error_t | |
file_name_path_scan (const char *file_name, const char *path, | |
error_t (*fun)(const char *name), | |
char **prefixed_name) | |
{ | |
if (path == NULL || index (file_name, '/')) | |
{ | |
if (prefixed_name) | |
*prefixed_name = 0; | |
return (*fun)(file_name); | |
} | |
else | |
{ | |
error_t real_err = 0; | |
size_t file_name_len = strlen (file_name); | |
for (;;) | |
{ | |
error_t err; | |
const char *next = index (path, ':') ?: path + strlen (path); | |
size_t pfx_len = next - path; | |
char pfxed_name[pfx_len + 2 + file_name_len + 1]; | |
if (pfx_len == 0) | |
pfxed_name[pfx_len++] = '.'; | |
else | |
memcpy (pfxed_name, path, pfx_len); | |
if (pfxed_name[pfx_len - 1] != '/') | |
pfxed_name[pfx_len++] = '/'; | |
memcpy (pfxed_name + pfx_len, file_name, file_name_len + 1); | |
err = (*fun)(pfxed_name); | |
if (err == 0) | |
{ | |
if (prefixed_name) | |
*prefixed_name = strdup (pfxed_name); | |
return 0; | |
} | |
if (!real_err && err != ENOENT) | |
real_err = err; | |
if (*next == '\0') | |
return real_err ?: ENOENT; | |
else | |
path = next + 1; | |
} | |
} | |
} | |
/* Lookup FILE_NAME and return the node opened with FLAGS & MODE in result | |
(see hurd_file_name_lookup for details), but a simple filename (without | |
any directory prefixes) will be consecutively prefixed with the pathnames | |
in the `:' separated list PATH until one succeeds in a successful lookup. | |
If none succeed, then the first error that wasn't ENOENT is returned, or | |
ENOENT if no other errors were returned. If PREFIXED_NAME is non-NULL, | |
then if RESULT is looked up directly, *PREFIXED_NAME is set to NULL, and | |
if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to | |
malloced storage containing the prefixed name. */ | |
error_t | |
hurd_file_name_path_lookup (error_t (*use_init_port) | |
(int which, error_t (*operate) (mach_port_t)), | |
file_t (*get_dtable_port) (int fd), | |
error_t (*lookup) | |
(file_t dir, char *name, int flags, mode_t mode, | |
retry_type *do_retry, string_t retry_name, | |
mach_port_t *result), | |
const char *file_name, const char *path, | |
int flags, mode_t mode, | |
file_t *result, char **prefixed_name) | |
{ | |
error_t scan_lookup (const char *name) | |
{ | |
return | |
__hurd_file_name_lookup (use_init_port, get_dtable_port, lookup, | |
name, flags, mode, result); | |
} | |
return file_name_path_scan (file_name, path, scan_lookup, prefixed_name); | |
} | |
file_t | |
file_name_path_lookup (const char *file_name, const char *path, | |
int flags, mode_t mode, char **prefixed_name) | |
{ | |
error_t err; | |
file_t result; | |
err = hurd_file_name_path_lookup (&_hurd_ports_use, &__getdport, 0, | |
file_name, path, flags, mode, | |
&result, prefixed_name); | |
return err ? (__hurd_fail (err), MACH_PORT_NULL) : result; | |
} |