1 This file is hash.def, from which is created hash.c.
2 It implements the builtin "hash" in Bash.
4 Copyright (C) 1987-2002 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
8 Bash is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License along
19 with Bash; see the file COPYING. If not, write to the Free Software
20 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
25 $FUNCTION hash_builtin
26 $SHORT_DOC hash [-lr] [-p pathname] [-dt] [name ...]
27 For each NAME, the full pathname of the command is determined and
28 remembered. If the -p option is supplied, PATHNAME is used as the
29 full pathname of NAME, and no path search is performed. The -r
30 option causes the shell to forget all remembered locations. The -d
31 option causes the shell to forget the remembered location of each NAME.
32 If the -t option is supplied the full pathname to which each NAME
33 corresponds is printed. If multiple NAME arguments are supplied with
34 -t, the NAME is printed before the hashed full pathname. The -l option
35 causes output to be displayed in a format that may be reused as input.
36 If no arguments are given, information about remembered commands is displayed.
43 #include "../bashtypes.h"
45 #if defined (HAVE_UNISTD_H)
51 #include "../bashansi.h"
54 #include "../builtins.h"
56 #include "../findcmd.h"
57 #include "../hashcmd.h"
59 #include "bashgetopt.h"
61 extern int dot_found_in_search;
62 extern char *this_command_name;
64 static int add_hashed_command __P((char *, int));
65 static int print_hash_info __P((BUCKET_CONTENTS *));
66 static int print_portable_hash_info __P((BUCKET_CONTENTS *));
67 static int print_hashed_commands __P((int));
68 static int list_hashed_filename_targets __P((WORD_LIST *, int));
70 /* Print statistics on the current state of hashed commands. If LIST is
71 not empty, then rehash (or hash in the first place) the specified
77 int expunge_hash_table, list_targets, list_portably, delete, opt;
80 if (hashing_enabled == 0)
82 builtin_error ("hashing disabled");
83 return (EXECUTION_FAILURE);
86 expunge_hash_table = list_targets = list_portably = delete = 0;
87 pathname = (char *)NULL;
88 reset_internal_getopt ();
89 while ((opt = internal_getopt (list, "dlp:rt")) != -1)
100 pathname = list_optarg;
103 expunge_hash_table = 1;
115 /* hash -t requires at least one argument. */
116 if (list == 0 && list_targets)
119 return (EXECUTION_FAILURE);
122 /* We want hash -r to be silent, but hash -- to print hashing info, so
123 we test expunge_hash_table. */
124 if (list == 0 && expunge_hash_table == 0)
126 if (print_hashed_commands (list_portably) == 0)
127 printf ("%s: hash table empty\n", this_command_name);
129 return (EXECUTION_SUCCESS);
132 if (expunge_hash_table)
135 /* If someone runs `hash -r -t xyz' he will be disappointed. */
137 return (list_hashed_filename_targets (list, list_portably));
139 #if defined (RESTRICTED_SHELL)
140 if (restricted && pathname && strchr (pathname, '/'))
142 sh_restricted (pathname);
143 return (EXECUTION_FAILURE);
147 for (opt = EXECUTION_SUCCESS; list; list = list->next)
149 /* Add, remove or rehash the specified commands. */
150 w = list->word->word;
153 if (is_directory (pathname))
156 builtin_error ("%s: %s", pathname, strerror (EISDIR));
158 builtin_error ("%s: is a directory", pathname);
160 opt = EXECUTION_FAILURE;
163 phash_insert (w, pathname, 0, 0);
165 else if (absolute_program (w))
167 else if (delete && phash_remove (w))
170 opt = EXECUTION_FAILURE;
172 else if (add_hashed_command (w, 0))
173 opt = EXECUTION_FAILURE;
181 add_hashed_command (w, quiet)
189 if (find_function (w) == 0 && find_shell_builtin (w) == 0)
191 full_path = find_user_command (w);
192 if (full_path && executable_file (full_path))
193 phash_insert (w, full_path, dot_found_in_search, 0);
205 /* Print information about current hashed info. */
207 print_hash_info (item)
208 BUCKET_CONTENTS *item;
210 printf ("%4d\t%s\n", item->times_found, pathdata(item)->path);
215 print_portable_hash_info (item)
216 BUCKET_CONTENTS *item;
218 printf ("builtin hash -p %s %s\n", pathdata(item)->path, item->key);
223 print_hashed_commands (fmt)
226 if (hashed_filenames == 0 || HASH_ENTRIES (hashed_filenames) == 0)
230 printf ("hits\tcommand\n");
231 hash_walk (hashed_filenames, fmt ? print_portable_hash_info : print_hash_info);
236 list_hashed_filename_targets (list, fmt)
240 int all_found, multiple;
245 multiple = list->next != 0;
247 for (l = list; l; l = l->next)
249 target = phash_search (l->word->word);
253 sh_notfound (l->word->word);
257 printf ("builtin hash -p %s %s\n", target, l->word->word);
261 printf ("%s\t", l->word->word);
262 printf ("%s\n", target);
266 return (all_found ? EXECUTION_SUCCESS : EXECUTION_FAILURE);