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Diffstat (limited to 'REORG.TODO/hurd/path-lookup.c')
| -rw-r--r-- | REORG.TODO/hurd/path-lookup.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/REORG.TODO/hurd/path-lookup.c b/REORG.TODO/hurd/path-lookup.c new file mode 100644 index 0000000000..f2061b0bff --- /dev/null +++ b/REORG.TODO/hurd/path-lookup.c @@ -0,0 +1,122 @@ +/* Filename lookup using a search path + Copyright (C) 1995-2017 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 || strchr (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 = strchr (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; +} |