/* vi: set sw=4 ts=4: *//* * Utility routines. * * Copyright (C) many different people.  If you wrote this, please * acknowledge your work. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA */#include <stdio.h>#include <stdlib.h>#include "libbb.h"/* This function parses the sort of string you might pass * to chmod (i.e., [ugoa]{+|-|=}[rwxst] ) and returns the * correct mode described by the string. */extern int parse_mode(const char *s, mode_t * theMode){	static const mode_t group_set[] = { 		S_ISUID | S_IRWXU,		/* u */		S_ISGID | S_IRWXG,		/* g */		S_IRWXO,				/* o */		S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO /* a */	};	static const mode_t mode_set[] = {		S_IRUSR | S_IRGRP | S_IROTH, /* r */		S_IWUSR | S_IWGRP | S_IWOTH, /* w */		S_IXUSR | S_IXGRP | S_IXOTH, /* x */		S_ISUID | S_ISGID,		/* s */		S_ISVTX					/* t */	};	static const char group_chars[] = "ugoa";	static const char mode_chars[] = "rwxst";	const char *p;	mode_t andMode =		S_ISVTX | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;	mode_t orMode = 0;	mode_t mode;	mode_t groups;	char type;	char c;	if (s==NULL) {		return (FALSE);	}	do {		mode = 0;		groups = 0;	NEXT_GROUP:		if ((c = *s++) == '\0') {			return -1;		}		for (p=group_chars ; *p ; p++) {			if (*p == c) {				groups |= group_set[(int)(p-group_chars)];				goto NEXT_GROUP;			}		}		switch (c) {			case '=':			case '+':			case '-':				type = c;				if (groups == 0) { /* The default is "all" */					groups |= S_ISUID | S_ISGID | S_ISVTX							| S_IRWXU | S_IRWXG | S_IRWXO;				}				break;			default:				if ((c < '0') || (c > '7') || (mode | groups)) {					return (FALSE);				} else {					*theMode = strtol(--s, NULL, 8);					return (TRUE);				}		}	NEXT_MODE:		if (((c = *s++) != '\0') && (c != ',')) {			for (p=mode_chars ; *p ; p++) {				if (*p == c) {					mode |= mode_set[(int)(p-mode_chars)];					goto NEXT_MODE;				}			}			break;				/* We're done so break out of loop.*/		}		switch (type) {			case '=':				andMode &= ~(groups); /* Now fall through. */			case '+':				orMode |= mode & groups;				break;			case '-':				andMode &= ~(mode & groups);				orMode &= ~(mode & groups);				break;		}	} while (c == ',');	*theMode &= andMode;	*theMode |= orMode;	return TRUE;}/* END CODE *//*Local Variables:c-file-style: "linux"c-basic-offset: 4tab-width: 4End:*/