1 This file is hash.def, from which is created hash.c.
2 It implements the builtin "hash" in Bash.
4 Copyright (C) 1987, 1989, 1991 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 [-r] [-p pathname] [-t] [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.
31 If the -t option is supplied the full pathname to which each NAME
32 corresponds is printed. If multiple NAME arguments are supplied with
33 -t, the NAME is printed before the hashed full pathname. If no arguments
34 are given, information about remembered commands is displayed.
41 #include "../bashtypes.h"
43 #if defined (HAVE_UNISTD_H)
49 #include "../bashansi.h"
52 #include "../builtins.h"
54 #include "../findcmd.h"
55 #include "../hashcmd.h"
57 #include "bashgetopt.h"
59 extern int dot_found_in_search;
60 extern char *this_command_name;
62 static int add_hashed_command __P((char *, int));
63 static int print_hashed_commands __P((void));
64 static int list_hashed_filename_targets __P((WORD_LIST *));
66 /* Print statistics on the current state of hashed commands. If LIST is
67 not empty, then rehash (or hash in the first place) the specified
73 int expunge_hash_table, list_targets, opt;
76 if (hashing_enabled == 0)
78 builtin_error ("hashing disabled");
79 return (EXECUTION_FAILURE);
82 expunge_hash_table = list_targets = 0;
83 pathname = (char *)NULL;
84 reset_internal_getopt ();
85 while ((opt = internal_getopt (list, "rp:t")) != -1)
90 expunge_hash_table = 1;
93 pathname = list_optarg;
105 /* hash -t requires at least one argument. */
106 if (list == 0 && list_targets)
108 builtin_error("-t: argument required");
109 return (EXECUTION_FAILURE);
112 /* We want hash -r to be silent, but hash -- to print hashing info. That
113 is the reason for the test of expunge_hash_table. */
114 if (list == 0 && expunge_hash_table == 0)
116 if (print_hashed_commands () == 0)
117 printf ("%s: hash table empty\n", this_command_name);
119 return (EXECUTION_SUCCESS);
122 if (expunge_hash_table)
123 flush_hashed_filenames ();
125 /* If someone runs `hash -r -t xyz' he will be disappointed. */
128 return (list_hashed_filename_targets (list));
131 #if defined (RESTRICTED_SHELL)
132 if (restricted && pathname && strchr (pathname, '/'))
134 builtin_error ("%s: restricted", pathname);
135 return (EXECUTION_FAILURE);
139 for (opt = EXECUTION_SUCCESS; list; list = list->next)
141 /* Add or rehash the specified commands. */
142 w = list->word->word;
145 if (is_directory (pathname))
148 builtin_error ("%s: %s", pathname, strerror (EISDIR));
150 builtin_error ("%s: is a directory", pathname);
152 opt = EXECUTION_FAILURE;
155 remember_filename (w, pathname, 0, 0);
157 else if (absolute_program (w))
159 else if (add_hashed_command (w, 0))
160 opt = EXECUTION_FAILURE;
168 add_hashed_command (w, quiet)
176 if (find_function (w) == 0 && find_shell_builtin (w) == 0)
178 full_path = find_user_command (w);
179 if (full_path && executable_file (full_path))
180 remember_filename (w, full_path, dot_found_in_search, 0);
184 builtin_error ("%s: not found", w);
193 /* Print information about current hashed info. */
195 print_hashed_commands ()
197 BUCKET_CONTENTS *item_list;
198 int bucket, any_printed;
200 if (hashed_filenames == 0)
203 for (bucket = any_printed = 0; bucket < hashed_filenames->nbuckets; bucket++)
205 item_list = get_hash_bucket (bucket, hashed_filenames);
209 if (any_printed == 0)
211 printf ("hits\tcommand\n");
215 for ( ; item_list; item_list = item_list->next)
216 printf ("%4d\t%s\n", item_list->times_found, pathdata(item_list)->path);
219 return (any_printed);
223 list_hashed_filename_targets (list)
226 int all_found, multiple;
231 multiple = list->next != 0;
233 for (l = list; l; l = l->next)
235 target = find_hashed_filename (l->word->word);
239 builtin_error ("%s: not found", l->word->word);
243 printf ("%s\t", l->word->word);
244 printf ("%s\n", target);
247 return (all_found ? EXECUTION_SUCCESS : EXECUTION_FAILURE);