mirror of
https://https.git.savannah.gnu.org/git/bash.git
synced 2026-06-21 21:07:57 +02:00
Chet Ramey
157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
/* chmod - change file mode bits */
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/* See Makefile for compilation details. */
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/*
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Copyright (C) 2024-2025 Free Software Foundation, Inc.
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This file is part of GNU Bash.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include "bashtypes.h"
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#include "posixstat.h"
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#include <errno.h>
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#include <stdio.h>
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#include "bashansi.h"
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include "builtins.h"
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#include "shell.h"
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#include "bashgetopt.h"
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#include "common.h"
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#if !defined (errno)
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extern int errno;
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#endif
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#define ISOCTAL(c) ((c) >= '0' && (c) <= '7')
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extern int parse_symbolic_mode (char *, mode_t);
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#define STANDARD_BITS (S_IRWXU | S_IRWXG | S_IRWXO)
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#define ALLBITS (STANDARD_BITS | S_ISUID| S_ISGID | S_ISVTX)
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int
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chmod_builtin (WORD_LIST *list)
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{
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int opt, nmode, lmode, rval;
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char *mode;
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struct stat st;
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WORD_LIST *l;
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reset_internal_getopt ();
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mode = (char *)NULL;
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while ((opt = internal_getopt(list, "fhvRHLP")) != -1)
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switch (opt)
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{
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CASE_HELPOPT;
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default:
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return (EX_DISKFALLBACK);
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}
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list = loptend;
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if (list == 0)
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{
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builtin_usage ();
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return (EX_USAGE);
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}
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mode = list->word->word;
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list = list->next;
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if (list == 0)
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{
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builtin_usage ();
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return (EX_USAGE);
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}
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nmode = -1;
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if (ISOCTAL (*mode)) /* octal number */
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{
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nmode = read_octal (mode);
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if (nmode < 0)
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{
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builtin_error ("invalid file mode: %s", mode);
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return (EXECUTION_FAILURE);
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}
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}
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else /* test for valid symbolic mode */
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{
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/* initial bits are a=rwx; the mode argument modifies them */
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lmode = parse_symbolic_mode (mode, ALLBITS);
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if (lmode < 0)
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{
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builtin_error ("invalid file mode: %s", mode);
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return (EXECUTION_FAILURE);
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}
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}
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for (rval = EXECUTION_SUCCESS, l = list; l; l = l->next)
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{
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lmode = nmode;
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if (stat (l->word->word, &st) < 0)
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{
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builtin_error ("`%s': cannot stat: %s", l->word->word, strerror (errno));
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rval = EXECUTION_FAILURE;
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continue;
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}
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if (lmode == -1)
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{
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lmode = parse_symbolic_mode (mode, st.st_mode & ALLBITS);
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if (lmode < 0)
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{
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builtin_error ("`%s': invalid file mode: %s", l->word->word, mode);
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rval = EXECUTION_FAILURE;
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continue;
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}
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}
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if (chmod (l->word->word, lmode))
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{
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builtin_error ("`%s': cannot change mode: %s", l->word->word, strerror (errno));
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rval = EXECUTION_FAILURE;
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continue;
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}
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}
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return rval;
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}
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char *chmod_doc[] = {
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"Change file mode bits.",
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"",
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"Change file mode bits. Change the mode bits of files named as",
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"arguments, in the order specified, as specified by MODE."
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"The MODE argument may be an octal number or a symbolic mode like",
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"that described in chmod(1). If a symbolic mode is used, the",
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"operations are interpreted relative to an initial mode of \"a=rwx\".",
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"",
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"The return value is 0 unless an error occurs.",
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(char *)NULL
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};
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struct builtin chmod_struct = {
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"chmod",
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chmod_builtin,
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BUILTIN_ENABLED,
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chmod_doc,
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"chmod [-R] mode file [file...]",
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0
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};
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