301 lines
6.8 KiB
Modula-2
301 lines
6.8 KiB
Modula-2
This file is umask.def, from which is created umask.c.
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It implements the builtin "umask" in Bash.
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Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 1, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with Bash; see the file COPYING. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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$PRODUCES umask.c
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$BUILTIN umask
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$FUNCTION umask_builtin
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$SHORT_DOC umask [-p] [-S] [mode]
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The user file-creation mask is set to MODE. If MODE is omitted, or if
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`-S' is supplied, the current value of the mask is printed. The `-S'
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option makes the output symbolic; otherwise an octal number is output.
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If `-p' is supplied, and MODE is omitted, the output is in a form
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that may be used as input. If MODE begins with a digit, it is
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interpreted as an octal number, otherwise it is a symbolic mode string
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like that accepted by chmod(1).
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$END
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#include <config.h>
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#include "../bashtypes.h"
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#include "../filecntl.h"
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#ifndef _MINIX
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# include <sys/file.h>
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#endif
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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 <stdio.h>
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#include "../shell.h"
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#include "../posixstat.h"
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#include "common.h"
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#include "bashgetopt.h"
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/* **************************************************************** */
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/* */
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/* UMASK Builtin and Helpers */
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/* */
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/* **************************************************************** */
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static void print_symbolic_umask ();
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static int symbolic_umask ();
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/* Set or display the mask used by the system when creating files. Flag
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of -S means display the umask in a symbolic mode. */
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int
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umask_builtin (list)
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WORD_LIST *list;
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{
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int print_symbolically, opt, umask_value, pflag;
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mode_t umask_arg;
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print_symbolically = pflag = 0;
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reset_internal_getopt ();
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while ((opt = internal_getopt (list, "Sp")) != -1)
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{
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switch (opt)
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{
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case 'S':
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print_symbolically++;
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break;
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case 'p':
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pflag++;
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break;
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default:
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builtin_usage ();
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return (EX_USAGE);
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}
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}
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list = loptend;
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if (list)
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{
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if (digit (*list->word->word))
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{
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umask_value = read_octal (list->word->word);
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/* Note that other shells just let you set the umask to zero
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by specifying a number out of range. This is a problem
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with those shells. We don't change the umask if the input
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is lousy. */
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if (umask_value == -1)
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{
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builtin_error ("`%s' is not an octal number from 000 to 777",
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list->word->word);
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return (EXECUTION_FAILURE);
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}
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}
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else
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{
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umask_value = symbolic_umask (list);
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if (umask_value == -1)
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return (EXECUTION_FAILURE);
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}
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umask_arg = (mode_t)umask_value;
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umask (umask_arg);
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if (print_symbolically)
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print_symbolic_umask (umask_arg);
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}
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else /* Display the UMASK for this user. */
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{
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umask_arg = umask (022);
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umask (umask_arg);
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if (pflag)
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printf ("umask%s ", (print_symbolically ? " -S" : ""));
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if (print_symbolically)
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print_symbolic_umask (umask_arg);
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else
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printf ("%03o\n", umask_arg);
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}
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fflush (stdout);
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return (EXECUTION_SUCCESS);
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}
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/* Print the umask in a symbolic form. In the output, a letter is
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printed if the corresponding bit is clear in the umask. */
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static void
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print_symbolic_umask (um)
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mode_t um;
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{
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char ubits[4], gbits[4], obits[4]; /* u=rwx,g=rwx,o=rwx */
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int i;
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i = 0;
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if ((um & S_IRUSR) == 0)
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ubits[i++] = 'r';
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if ((um & S_IWUSR) == 0)
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ubits[i++] = 'w';
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if ((um & S_IXUSR) == 0)
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ubits[i++] = 'x';
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ubits[i] = '\0';
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i = 0;
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if ((um & S_IRGRP) == 0)
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gbits[i++] = 'r';
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if ((um & S_IWGRP) == 0)
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gbits[i++] = 'w';
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if ((um & S_IXGRP) == 0)
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gbits[i++] = 'x';
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gbits[i] = '\0';
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i = 0;
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if ((um & S_IROTH) == 0)
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obits[i++] = 'r';
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if ((um & S_IWOTH) == 0)
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obits[i++] = 'w';
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if ((um & S_IXOTH) == 0)
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obits[i++] = 'x';
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obits[i] = '\0';
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printf ("u=%s,g=%s,o=%s\n", ubits, gbits, obits);
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}
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int
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parse_symbolic_mode (mode, initial_bits)
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char *mode;
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int initial_bits;
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{
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int who, op, perm, mask, bits, c;
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char *s;
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for (s = mode, bits = initial_bits;;)
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{
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who = op = perm = mask = 0;
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/* Parse the `who' portion of the symbolic mode clause. */
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while (member (*s, "agou"))
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{
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switch (c = *s++)
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{
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case 'u':
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who |= S_IRWXU;
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continue;
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case 'g':
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who |= S_IRWXG;
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continue;
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case 'o':
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who |= S_IRWXO;
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continue;
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case 'a':
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who |= S_IRWXU | S_IRWXG | S_IRWXO;
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continue;
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default:
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break;
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}
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}
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/* The operation is now sitting in *s. */
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op = *s++;
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switch (op)
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{
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case '+':
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case '-':
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case '=':
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break;
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default:
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builtin_error ("bad symbolic mode operator: %c", op);
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return (-1);
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}
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/* Parse out the `perm' section of the symbolic mode clause. */
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while (member (*s, "rwx"))
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{
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c = *s++;
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switch (c)
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{
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case 'r':
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perm |= S_IRUGO;
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break;
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case 'w':
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perm |= S_IWUGO;
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break;
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case 'x':
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perm |= S_IXUGO;
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break;
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}
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}
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/* Now perform the operation or return an error for a
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bad permission string. */
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if (!*s || *s == ',')
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{
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if (who)
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perm &= who;
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switch (op)
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{
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case '+':
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bits |= perm;
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break;
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case '-':
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bits &= ~perm;
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break;
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case '=':
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bits &= ~who;
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bits |= perm;
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break;
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/* No other values are possible. */
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}
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if (*s == '\0')
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break;
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else
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s++; /* skip past ',' */
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}
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else
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{
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builtin_error ("bad character in symbolic mode: %c", *s);
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return (-1);
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}
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}
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return (bits);
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}
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/* Set the umask from a symbolic mode string similar to that accepted
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by chmod. If the -S argument is given, then print the umask in a
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symbolic form. */
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static int
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symbolic_umask (list)
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WORD_LIST *list;
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{
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int um, bits;
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/* Get the initial umask. Don't change it yet. */
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um = umask (022);
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umask (um);
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/* All work is done with the complement of the umask -- it's
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more intuitive and easier to deal with. It is complemented
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again before being returned. */
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bits = parse_symbolic_mode (list->word->word, ~um);
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um = ~bits & 0777;
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return (um);
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}
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