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139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) tons of folks. Tracking down who wrote what
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* isn't something I'm going to worry about... If you wrote something
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* here, please feel free to acknowledge your work.
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
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* Permission has been granted to redistribute this code under the GPL.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "libbb.h"
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/* This function parses the sort of string you might pass
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* to chmod (i.e. [ugoa]{+|-|=}[rwxst] ) and returns the
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* correct mode described by the string. */
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extern int parse_mode(const char *s, mode_t * theMode)
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{
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static const mode_t group_set[] = {
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S_ISUID | S_IRWXU, /* u */
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S_ISGID | S_IRWXG, /* g */
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S_IRWXO, /* o */
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S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO /* a */
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};
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static const mode_t mode_set[] = {
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S_IRUSR | S_IRGRP | S_IROTH, /* r */
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S_IWUSR | S_IWGRP | S_IWOTH, /* w */
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S_IXUSR | S_IXGRP | S_IXOTH, /* x */
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S_ISUID | S_ISGID, /* s */
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S_ISVTX /* t */
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};
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static const char group_chars[] = "ugoa";
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static const char mode_chars[] = "rwxst";
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const char *p;
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mode_t andMode =
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S_ISVTX | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
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mode_t orMode = 0;
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mode_t mode;
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mode_t groups;
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char type;
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char c;
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if (s==NULL) {
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return (FALSE);
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}
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do {
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mode = 0;
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groups = 0;
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NEXT_GROUP:
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if ((c = *s++) == '\0') {
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return -1;
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}
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for (p=group_chars ; *p ; p++) {
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if (*p == c) {
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groups |= group_set[(int)(p-group_chars)];
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goto NEXT_GROUP;
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}
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}
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switch (c) {
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case '=':
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case '+':
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case '-':
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type = c;
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if (groups == 0) { /* The default is "all" */
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groups |= S_ISUID | S_ISGID | S_ISVTX
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| S_IRWXU | S_IRWXG | S_IRWXO;
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}
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break;
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default:
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if ((c < '0') || (c > '7') || (mode | groups)) {
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return (FALSE);
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} else {
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*theMode = strtol(--s, NULL, 8);
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return (TRUE);
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}
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}
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NEXT_MODE:
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if (((c = *s++) != '\0') && (c != ',')) {
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for (p=mode_chars ; *p ; p++) {
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if (*p == c) {
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mode |= mode_set[(int)(p-mode_chars)];
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goto NEXT_MODE;
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}
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}
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break; /* We're done so break out of loop.*/
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}
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switch (type) {
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case '=':
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andMode &= ~(groups); /* Now fall through. */
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case '+':
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orMode |= mode & groups;
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break;
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case '-':
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andMode &= ~(mode & groups);
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orMode &= ~(mode & groups);
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break;
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}
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} while (c == ',');
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*theMode &= andMode;
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*theMode |= orMode;
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return TRUE;
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}
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/* END CODE */
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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