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/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) tons of folks. Tracking down who wrote what
* isn't something I'm going to worry about... If you wrote something
* here, please feel free to 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
*
* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
* Permission has been granted to redistribute this code under the GPL.
*
*/
#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: 4
tab-width: 4
End:
*/
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