[bpt/emacs.git] / oldXMenu / XCrAssoc.c

/* Copyright    Massachusetts Institute of Technology    1985	*/
/* Copyright (C) 2001, 2002, 2003, 2004, 2005,
                 2006, 2007 Free Software Foundation, Inc.  */

/*
Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation, and that the name of M.I.T. not be used in advertising or
publicity pertaining to distribution of the software without specific,
written prior permission.  M.I.T. makes no representations about the
suitability of this software for any purpose.  It is provided "as is"
without express or implied warranty.
*/

#include <config.h>
#include <X11/Xlib.h>
#include <errno.h>
#include "X10.h"

#ifndef NULL
#define NULL 0
#endif

extern int errno;

/*
 * XCreateAssocTable - Create an XAssocTable.  The size argument should be
 * a power of two for efficiency reasons.  Some size suggestions: use 32
 * buckets per 100 objects;  a reasonable maximum number of object per
 * buckets is 8.  If there is an error creating the XAssocTable, a NULL
 * pointer is returned.
 */
XAssocTable *XCreateAssocTable(size)
	register int size;		/* Desired size of the table. */
{
	register XAssocTable *table;	/* XAssocTable to be initialized. */
	register XAssoc *buckets;	/* Pointer to the first bucket in */
					/* the bucket array. */

	/* Malloc the XAssocTable. */
	if ((table = (XAssocTable *)malloc(sizeof(XAssocTable))) == NULL) {
		/* malloc call failed! */
		errno = ENOMEM;
		return(NULL);
	}

	/* calloc the buckets (actually just their headers). */
	buckets = (XAssoc *)calloc((unsigned)size, (unsigned)sizeof(XAssoc));
	if (buckets == NULL) {
		/* calloc call failed! */
		errno = ENOMEM;
		return(NULL);
	}

	/* Insert table data into the XAssocTable structure. */
	table->buckets = buckets;
	table->size = size;

	while (--size >= 0) {
		/* Initialize each bucket. */
		buckets->prev = buckets;
		buckets->next = buckets;
		buckets++;
	}

	return(table);
}

/* arch-tag: 5df3237d-ada0-4345-a3ab-282cafb397aa
   (do not change this comment) */
Commit	Line	Data
e745ede7	1	/* Copyright Massachusetts Institute of Technology 1985 */
61e1e4e8	2	/* Copyright (C) 2001, 2002, 2003, 2004, 2005,
4e6835db	3	2006, 2007 Free Software Foundation, Inc. */
e745ede7 DL	4
	5	/*
	6	Permission to use, copy, modify, distribute, and sell this software and its
	7	documentation for any purpose is hereby granted without fee, provided that
	8	the above copyright notice appear in all copies and that both that
	9	copyright notice and this permission notice appear in supporting
	10	documentation, and that the name of M.I.T. not be used in advertising or
	11	publicity pertaining to distribution of the software without specific,
	12	written prior permission. M.I.T. makes no representations about the
	13	suitability of this software for any purpose. It is provided "as is"
	14	without express or implied warranty.
	15	*/
	16
	17	#include <config.h>
	18	#include <X11/Xlib.h>
	19	#include <errno.h>
	20	#include "X10.h"
	21
	22	#ifndef NULL
	23	#define NULL 0
	24	#endif
	25
	26	extern int errno;
	27
	28	/*
	29	* XCreateAssocTable - Create an XAssocTable. The size argument should be
	30	* a power of two for efficiency reasons. Some size suggestions: use 32
	31	* buckets per 100 objects; a reasonable maximum number of object per
	32	* buckets is 8. If there is an error creating the XAssocTable, a NULL
	33	* pointer is returned.
	34	*/
	35	XAssocTable *XCreateAssocTable(size)
	36	register int size; /* Desired size of the table. */
	37	{
	38	register XAssocTable table; / XAssocTable to be initialized. */
	39	register XAssoc buckets; / Pointer to the first bucket in */
	40	/* the bucket array. */
177c0ea7	41
e745ede7 DL	42	/* Malloc the XAssocTable. */
	43	if ((table = (XAssocTable *)malloc(sizeof(XAssocTable))) == NULL) {
	44	/* malloc call failed! */
	45	errno = ENOMEM;
	46	return(NULL);
	47	}
177c0ea7	48
e745ede7 DL	49	/* calloc the buckets (actually just their headers). */
	50	buckets = (XAssoc *)calloc((unsigned)size, (unsigned)sizeof(XAssoc));
	51	if (buckets == NULL) {
	52	/* calloc call failed! */
	53	errno = ENOMEM;
	54	return(NULL);
	55	}
	56
	57	/* Insert table data into the XAssocTable structure. */
	58	table->buckets = buckets;
	59	table->size = size;
	60
	61	while (--size >= 0) {
	62	/* Initialize each bucket. */
	63	buckets->prev = buckets;
	64	buckets->next = buckets;
	65	buckets++;
	66	}
	67
	68	return(table);
	69	}
ab5796a9 MB	70
	71	/* arch-tag: 5df3237d-ada0-4345-a3ab-282cafb397aa
	72	(do not change this comment) */