123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/* Filename lookup using a search path
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Copyright (C) 1995-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <hurd.h>
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#include <hurd/lookup.h>
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/* If FILE_NAME contains a '/', or PATH is NULL, call FUN with FILE_NAME, and
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return the result (if PREFIXED_NAME is non-NULL, setting *PREFIXED_NAME to
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NULL). Otherwise, call FUN repeatedly with FILE_NAME prefixed with each
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successive `:' separated element of PATH, returning whenever FUN returns
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0 (if PREFIXED_NAME is non-NULL, setting *PREFIXED_NAME to the resulting
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prefixed path). If FUN never returns 0, return the first non-ENOENT
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return value, or ENOENT if there is none. */
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error_t
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file_name_path_scan (const char *file_name, const char *path,
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error_t (*fun)(const char *name),
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char **prefixed_name)
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{
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if (path == NULL || strchr (file_name, '/'))
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{
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if (prefixed_name)
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*prefixed_name = 0;
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return (*fun)(file_name);
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}
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else
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{
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error_t real_err = 0;
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size_t file_name_len = strlen (file_name);
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for (;;)
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{
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error_t err;
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const char *next = strchr (path, ':') ?: path + strlen (path);
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size_t pfx_len = next - path;
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char pfxed_name[pfx_len + 2 + file_name_len + 1];
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if (pfx_len == 0)
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pfxed_name[pfx_len++] = '.';
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else
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memcpy (pfxed_name, path, pfx_len);
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if (pfxed_name[pfx_len - 1] != '/')
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pfxed_name[pfx_len++] = '/';
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memcpy (pfxed_name + pfx_len, file_name, file_name_len + 1);
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err = (*fun)(pfxed_name);
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if (err == 0)
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{
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if (prefixed_name)
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*prefixed_name = __strdup (pfxed_name);
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return 0;
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}
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if (!real_err && err != ENOENT)
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real_err = err;
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if (*next == '\0')
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return real_err ?: ENOENT;
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else
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path = next + 1;
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}
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}
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}
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/* Lookup FILE_NAME and return the node opened with FLAGS & MODE in result
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(see hurd_file_name_lookup for details), but a simple filename (without
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any directory prefixes) will be consecutively prefixed with the pathnames
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in the `:' separated list PATH until one succeeds in a successful lookup.
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If none succeed, then the first error that wasn't ENOENT is returned, or
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ENOENT if no other errors were returned. If PREFIXED_NAME is non-NULL,
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then if RESULT is looked up directly, *PREFIXED_NAME is set to NULL, and
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if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to
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malloced storage containing the prefixed name. */
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error_t
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__hurd_file_name_path_lookup (error_t (*use_init_port)
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(int which, error_t (*operate) (mach_port_t)),
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file_t (*get_dtable_port) (int fd),
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error_t (*lookup)
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(file_t dir, const char *name, int flags, mode_t mode,
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retry_type *do_retry, string_t retry_name,
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mach_port_t *result),
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const char *file_name, const char *path,
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int flags, mode_t mode,
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file_t *result, char **prefixed_name)
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{
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error_t scan_lookup (const char *name)
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{
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return
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__hurd_file_name_lookup (use_init_port, get_dtable_port, lookup,
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name, flags, mode, result);
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}
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return file_name_path_scan (file_name, path, scan_lookup, prefixed_name);
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}
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strong_alias (__hurd_file_name_path_lookup, hurd_file_name_path_lookup)
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file_t
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file_name_path_lookup (const char *file_name, const char *path,
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int flags, mode_t mode, char **prefixed_name)
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{
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error_t err;
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file_t result;
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err = __hurd_file_name_path_lookup (&_hurd_ports_use, &__getdport, 0,
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file_name, path, flags, mode,
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&result, prefixed_name);
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return err ? (__hurd_fail (err), MACH_PORT_NULL) : result;
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}
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