cmsarray.c
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上传日期:2007-01-12
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文件大小:5k
- /*
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the Netscape security libraries.
- *
- * The Initial Developer of the Original Code is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1994-2000 Netscape Communications Corporation. All
- * Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the
- * GPL.
- */
- /*
- * CMS array functions.
- *
- * $Id: cmsarray.c,v 1.3 2000/06/21 18:12:02 chrisk%netscape.com Exp $
- */
- #include "cmslocal.h"
- #include "secerr.h"
- /*
- * ARRAY FUNCTIONS
- *
- * In NSS, arrays are rather primitive arrays of pointers.
- * Makes it easy to walk the array, but hard to count elements
- * and manage the storage.
- *
- * This is a feeble attempt to encapsulate the functionality
- * and get rid of hundreds of lines of similar code
- */
- /*
- * NSS_CMSArray_Alloc - allocate an array in an arena
- *
- * This allocates space for the array of pointers
- */
- void **
- NSS_CMSArray_Alloc(PRArenaPool *poolp, int n)
- {
- return (void **)PORT_ArenaZAlloc(poolp, n * sizeof(void *));
- }
- /*
- * NSS_CMSArray_Add - add an element to the end of an array
- *
- * The array of pointers is either created (if array was empty before) or grown.
- */
- SECStatus
- NSS_CMSArray_Add(PRArenaPool *poolp, void ***array, void *obj)
- {
- void **p;
- int n;
- void **dest;
- PORT_Assert(array != NULL);
- if (array == NULL)
- return SECFailure;
- if (*array == NULL) {
- dest = (void **)PORT_ArenaAlloc(poolp, 2 * sizeof(void *));
- n = 0;
- } else {
- n = 0; p = *array;
- while (*p++)
- n++;
- dest = (void **)PORT_ArenaGrow (poolp,
- *array,
- (n + 1) * sizeof(void *),
- (n + 2) * sizeof(void *));
- }
- dest[n] = obj;
- dest[n+1] = NULL;
- *array = dest;
- return SECSuccess;
- }
- /*
- * NSS_CMSArray_IsEmpty - check if array is empty
- */
- PRBool
- NSS_CMSArray_IsEmpty(void **array)
- {
- return (array == NULL || array[0] == NULL);
- }
- /*
- * NSS_CMSArray_Count - count number of elements in array
- */
- int
- NSS_CMSArray_Count(void **array)
- {
- int n = 0;
- if (array == NULL)
- return 0;
- while (*array++ != NULL)
- n++;
- return n;
- }
- /*
- * NSS_CMSArray_Sort - sort an array in place
- *
- * If "secondary" or "tertiary are not NULL, it must be arrays with the same
- * number of elements as "primary". The same reordering will get applied to it.
- *
- * "compare" is a function that returns
- * < 0 when the first element is less than the second
- * = 0 when the first element is equal to the second
- * > 0 when the first element is greater than the second
- * to acheive ascending ordering.
- */
- void
- NSS_CMSArray_Sort(void **primary, int (*compare)(void *,void *), void **secondary, void **tertiary)
- {
- int n, i, limit, lastxchg;
- void *tmp;
- n = NSS_CMSArray_Count(primary);
- PORT_Assert(secondary == NULL || NSS_CMSArray_Count(secondary) == n);
- PORT_Assert(tertiary == NULL || NSS_CMSArray_Count(tertiary) == n);
-
- if (n <= 1) /* ordering is fine */
- return;
-
- /* yes, ladies and gentlemen, it's BUBBLE SORT TIME! */
- limit = n - 1;
- while (1) {
- lastxchg = 0;
- for (i = 0; i < limit; i++) {
- if ((*compare)(primary[i], primary[i+1]) > 0) {
- /* exchange the neighbours */
- tmp = primary[i+1];
- primary[i+1] = primary[i];
- primary[i] = tmp;
- if (secondary) { /* secondary array? */
- tmp = secondary[i+1]; /* exchange there as well */
- secondary[i+1] = secondary[i];
- secondary[i] = tmp;
- }
- if (tertiary) { /* tertiary array? */
- tmp = tertiary[i+1]; /* exchange there as well */
- tertiary[i+1] = tertiary[i];
- tertiary[i] = tmp;
- }
- lastxchg = i+1; /* index of the last element bubbled up */
- }
- }
- if (lastxchg == 0) /* no exchanges, so array is sorted */
- break; /* we're done */
- limit = lastxchg; /* array is sorted up to [limit] */
- }
- }
- #if 0
- /* array iterator stuff... not used */
- typedef void **NSSCMSArrayIterator;
- /* iterator */
- NSSCMSArrayIterator
- NSS_CMSArray_First(void **array)
- {
- if (array == NULL || array[0] == NULL)
- return NULL;
- return (NSSCMSArrayIterator)&(array[0]);
- }
- void *
- NSS_CMSArray_Obj(NSSCMSArrayIterator iter)
- {
- void **p = (void **)iter;
- return *iter; /* which is NULL if we are at the end of the array */
- }
- NSSCMSArrayIterator
- NSS_CMSArray_Next(NSSCMSArrayIterator iter)
- {
- void **p = (void **)iter;
- return (NSSCMSArrayIterator)(p + 1);
- }
- #endif