1 This file is umask.def, from which is created umask.c.
2 It implements the builtin "umask" 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 umask_builtin
26 $SHORT_DOC umask [-p] [-S] [mode]
27 The user file-creation mask is set to MODE. If MODE is omitted, or if
28 `-S' is supplied, the current value of the mask is printed. The `-S'
29 option makes the output symbolic; otherwise an octal number is output.
30 If `-p' is supplied, and MODE is omitted, the output is in a form
31 that may be used as input. If MODE begins with a digit, it is
32 interpreted as an octal number, otherwise it is a symbolic mode string
33 like that accepted by chmod(1).
38 #include "../bashtypes.h"
41 # include <sys/file.h>
44 #if defined (HAVE_UNISTD_H)
51 #include "posixstat.h"
53 #include "bashgetopt.h"
55 /* **************************************************************** */
57 /* UMASK Builtin and Helpers */
59 /* **************************************************************** */
61 static void print_symbolic_umask ();
62 static int symbolic_umask ();
64 /* Set or display the mask used by the system when creating files. Flag
65 of -S means display the umask in a symbolic mode. */
70 int print_symbolically, opt, umask_value, pflag;
73 print_symbolically = pflag = 0;
74 reset_internal_getopt ();
75 while ((opt = internal_getopt (list, "Sp")) != -1)
95 if (digit (*list->word->word))
97 umask_value = read_octal (list->word->word);
99 /* Note that other shells just let you set the umask to zero
100 by specifying a number out of range. This is a problem
101 with those shells. We don't change the umask if the input
103 if (umask_value == -1)
105 builtin_error ("`%s' is not an octal number from 000 to 777",
107 return (EXECUTION_FAILURE);
112 umask_value = symbolic_umask (list);
113 if (umask_value == -1)
114 return (EXECUTION_FAILURE);
116 umask_arg = (mode_t)umask_value;
118 if (print_symbolically)
119 print_symbolic_umask (umask_arg);
121 else /* Display the UMASK for this user. */
123 umask_arg = umask (022);
127 printf ("umask%s ", (print_symbolically ? " -S" : ""));
128 if (print_symbolically)
129 print_symbolic_umask (umask_arg);
131 printf ("%03o\n", umask_arg);
135 return (EXECUTION_SUCCESS);
138 /* Print the umask in a symbolic form. In the output, a letter is
139 printed if the corresponding bit is clear in the umask. */
141 print_symbolic_umask (um)
144 char ubits[4], gbits[4], obits[4]; /* u=rwx,g=rwx,o=rwx */
148 if ((um & S_IRUSR) == 0)
150 if ((um & S_IWUSR) == 0)
152 if ((um & S_IXUSR) == 0)
157 if ((um & S_IRGRP) == 0)
159 if ((um & S_IWGRP) == 0)
161 if ((um & S_IXGRP) == 0)
166 if ((um & S_IROTH) == 0)
168 if ((um & S_IWOTH) == 0)
170 if ((um & S_IXOTH) == 0)
174 printf ("u=%s,g=%s,o=%s\n", ubits, gbits, obits);
178 parse_symbolic_mode (mode, initial_bits)
182 int who, op, perm, mask, bits, c;
185 for (s = mode, bits = initial_bits;;)
187 who = op = perm = mask = 0;
189 /* Parse the `who' portion of the symbolic mode clause. */
190 while (member (*s, "agou"))
204 who |= S_IRWXU | S_IRWXG | S_IRWXO;
211 /* The operation is now sitting in *s. */
220 builtin_error ("bad symbolic mode operator: %c", op);
224 /* Parse out the `perm' section of the symbolic mode clause. */
225 while (member (*s, "rwx"))
243 /* Now perform the operation or return an error for a
244 bad permission string. */
245 if (!*s || *s == ',')
263 /* No other values are possible. */
269 s++; /* skip past ',' */
273 builtin_error ("bad character in symbolic mode: %c", *s);
281 /* Set the umask from a symbolic mode string similar to that accepted
282 by chmod. If the -S argument is given, then print the umask in a
285 symbolic_umask (list)
290 /* Get the initial umask. Don't change it yet. */
294 /* All work is done with the complement of the umask -- it's
295 more intuitive and easier to deal with. It is complemented
296 again before being returned. */
297 bits = parse_symbolic_mode (list->word->word, ~um);