*
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+#include "libbb.h"
/* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
-#include <stdlib.h>
-#include <assert.h>
-#include <sys/stat.h>
-#include "libbb.h"
+/* This function is used from NOFORK applets. It must not allocate anything */
-#define FILEMODEBITS (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
+#define FILEMODEBITS (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
-int bb_parse_mode(const char *s, mode_t *current_mode)
+int FAST_FUNC bb_parse_mode(const char *s, unsigned current_mode)
{
static const mode_t who_mask[] = {
S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO, /* a */
- S_ISUID | S_IRWXU, /* u */
- S_ISGID | S_IRWXG, /* g */
- S_IRWXO /* o */
+ S_ISUID | S_IRWXU, /* u */
+ S_ISGID | S_IRWXG, /* g */
+ S_IRWXO /* o */
};
-
static const mode_t perm_mask[] = {
S_IRUSR | S_IRGRP | S_IROTH, /* r */
S_IWUSR | S_IWGRP | S_IWOTH, /* w */
S_IXUSR | S_IXGRP | S_IXOTH, /* x */
S_IXUSR | S_IXGRP | S_IXOTH, /* X -- special -- see below */
- S_ISUID | S_ISGID, /* s */
- S_ISVTX /* t */
+ S_ISUID | S_ISGID, /* s */
+ S_ISVTX /* t */
};
-
- static const char who_chars[] = "augo";
- static const char perm_chars[] = "rwxXst";
+ static const char who_chars[] ALIGN1 = "augo";
+ static const char perm_chars[] ALIGN1 = "rwxXst";
const char *p;
-
mode_t wholist;
mode_t permlist;
- mode_t mask;
mode_t new_mode;
char op;
- assert(s);
-
- if (((unsigned int)(*s - '0')) < 8) {
+ if ((unsigned char)(*s - '0') < 8) {
unsigned long tmp;
char *e;
- tmp = strtol(s, &e, 8);
+ tmp = strtoul(s, &e, 8);
if (*e || (tmp > 07777U)) { /* Check range and trailing chars. */
- return 0;
+ return -1;
}
- *current_mode = tmp;
- return 1;
+ return tmp;
}
- mask = umask(0);
- umask(mask);
-
- new_mode = *current_mode;
+ new_mode = current_mode;
- /* Note: We allow empty clauses, and hence empty modes.
+ /* Note: we allow empty clauses, and hence empty modes.
* We treat an empty mode as no change to perms. */
- while (*s) { /* Process clauses. */
-
- if (*s == ',') { /* We allow empty clauses. */
+ while (*s) { /* Process clauses. */
+ if (*s == ',') { /* We allow empty clauses. */
++s;
continue;
}
/* Get a wholist. */
wholist = 0;
-
- WHO_LIST:
+ WHO_LIST:
p = who_chars;
do {
if (*p == *s) {
wholist |= who_mask[(int)(p-who_chars)];
if (!*++s) {
- return 0;
+ return -1;
}
goto WHO_LIST;
}
} while (*++p);
- do { /* Process action list. */
+ do { /* Process action list. */
if ((*s != '+') && (*s != '-')) {
if (*s != '=') {
- return 0;
+ return -1;
}
/* Since op is '=', clear all bits corresponding to the
- * wholist, of all file bits if wholist is empty. */
+ * wholist, or all file bits if wholist is empty. */
permlist = ~FILEMODEBITS;
if (wholist) {
permlist = ~wholist;
op = *s++;
/* Check for permcopy. */
- p = who_chars + 1; /* Skip 'a' entry. */
+ p = who_chars + 1; /* Skip 'a' entry. */
do {
if (*p == *s) {
int i = 0;
/* It was not a permcopy, so get a permlist. */
permlist = 0;
-
- PERM_LIST:
+ PERM_LIST:
p = perm_chars;
do {
if (*p == *s) {
if ((*p != 'X')
- || (new_mode & (S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH))
+ || (new_mode & (S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH))
) {
permlist |= perm_mask[(int)(p-perm_chars)];
}
goto PERM_LIST;
}
} while (*++p);
-
- GOT_ACTION:
- if (permlist) { /* The permlist was nonempty. */
- mode_t tmp = ~mask;
- if (wholist) {
- tmp = wholist;
+ GOT_ACTION:
+ if (permlist) { /* The permlist was nonempty. */
+ mode_t tmp = wholist;
+ if (!wholist) {
+ mode_t u_mask = umask(0);
+ umask(u_mask);
+ tmp = ~u_mask;
}
permlist &= tmp;
-
if (op == '-') {
new_mode &= ~permlist;
} else {
} while (*s && (*s != ','));
}
- *current_mode = new_mode;
-
- return 1;
+ return new_mode;
}
projects / oweals / busybox.git / blobdiff