Major coreutils update.

1 files changed, 129 insertions, 86 deletions

diff --git a/libbb/parse_mode.c b/libbb/parse_mode.c
index ba34ea9..49573df 100644
--- a/libbb/parse_mode.c
+++ b/libbb/parse_mode.c
@@ -1,134 +1,177 @@
 /* vi: set sw=4 ts=4: */
 /*
- * Utility routines.
+ * parse_mode implementation for busybox
  *
- * Copyright (C) many different people.  If you wrote this, please
- * acknowledge your work.
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
  *
  * 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
+ * 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
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
  */
 
-#include <stdio.h>
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
+
 #include <stdlib.h>
+#include <assert.h>
+#include <sys/stat.h>
 #include "libbb.h"
 
+#define FILEMODEBITS    (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
 
-/* 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)
+extern int bb_parse_mode(const char *s, mode_t *current_mode)
 {
-	static const mode_t group_set[] = { 
+	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_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO /* a */
+		S_IRWXO					/* o */
 	};
 
-	static const mode_t mode_set[] = {
+	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 */
 	};
 
-	static const char group_chars[] = "ugoa";
-	static const char mode_chars[] = "rwxst";
+	static const char who_chars[] = "augo";
+	static const char perm_chars[] = "rwxXst";
 
 	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;
+	mode_t wholist;
+	mode_t permlist;
+	mode_t mask;
+	mode_t new_mode;
+	char op;
+
+	assert(s);
+
+	if (((unsigned int)(*s - '0')) < 8) {
+		unsigned long tmp;
+		char *e;
 
-	if (s==NULL) {
-		return (FALSE);
+		tmp = strtol(s, &e, 8);
+		if (*e || (tmp > 0xffffU)) { /* Check range and trailing chars. */
+			return 0;
+		}
+		*current_mode = tmp;
+		return 1;
 	}
 
-	do {
-		mode = 0;
-		groups = 0;
-	NEXT_GROUP:
-		if ((c = *s++) == '\0') {
-			return -1;
+	mask = umask(0);
+	umask(mask);
+
+	new_mode = *current_mode;
+
+	/* 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. */
+			++s;
+			continue;
 		}
-		for (p=group_chars ; *p ; p++) {
-			if (*p == c) {
-				groups |= group_set[(int)(p-group_chars)];
-				goto NEXT_GROUP;
+
+		/* Get a wholist. */
+		wholist = 0;
+
+	WHO_LIST:
+		p = who_chars;
+		do {
+			if (*p == *s) {
+				wholist |= who_mask[(int)(p-who_chars)];
+				if (!*++s) {
+					return 0;
+				}
+				goto WHO_LIST;
 			}
-		}
-		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;
+		} while (*++p);
+
+		do {	/* Process action list. */
+			if ((*s != '+') && (*s != '-')) {
+				if (*s != '=') {
+					return 0;
 				}
-				break;
-			default:
-				if ((c < '0') || (c > '7') || (mode | groups)) {
-					return (FALSE);
-				} else {
-					*theMode = strtol(--s, NULL, 8);
-					return (TRUE);
+				/* Since op is '=', clear all bits corresponding to the
+				 * wholist, of all file bits if wholist is empty. */
+				permlist = ~FILEMODEBITS;
+				if (wholist) {
+					permlist = ~wholist;
 				}
-		}
+				new_mode &= permlist;
+			}
+			op = *s++;
+
+			/* Check for permcopy. */
+			p = who_chars + 1;	/* Skip 'a' entry. */
+			do {
+				if (*p == *s) {
+					int i = 0;
+					permlist = who_mask[(int)(p-who_chars)]
+							 & (S_IRWXU | S_IRWXG | S_IRWXO)
+							 & new_mode;
+					do {
+						if (permlist & perm_mask[i]) {
+							permlist |= perm_mask[i];
+						}
+					} while (++i < 3);
+					++s;
+					goto GOT_ACTION;
+				}
+			} while (*++p);
 
-	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;
+			/* It was not a permcopy, so get a permlist. */
+			permlist = 0;
+
+		PERM_LIST:
+			p = perm_chars;
+			do {
+				if (*p == *s) {
+					if ((*p != 'X')
+						|| (new_mode & (S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH))
+					) {
+						permlist |= perm_mask[(int)(p-perm_chars)];
+					}
+					if (!*++s) {
+						break;
+					}
+					goto PERM_LIST;
+				}
+			} while (*++p);
+
+		GOT_ACTION:
+			if (permlist) {	/* The permlist was nonempty. */
+				mode_t tmp = ~mask;
+				if (wholist) {
+					tmp = wholist;
+				}
+				permlist &= tmp;
+
+				if (op == '-') {
+					new_mode &= ~permlist;
+				} else {
+					new_mode |= permlist;
 				}
 			}
-			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 == ',');
+		} while (*s && (*s != ','));
+	}
 
-	*theMode &= andMode;
-	*theMode |= orMode;
+	*current_mode = new_mode;
 
-	return TRUE;
+	return 1;
 }
-
-/* END CODE */
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/