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Annotation of researchv9/X11/src/X.V11R1/lib/oldX/XCrAssoc.c, revision 1.1

1.1     ! root        1: #include "copyright.h"
        !             2: 
        !             3: /* $Header: XCrAssoc.c,v 10.15 87/09/11 07:56:32 toddb Exp $ */
        !             4: /* Copyright    Massachusetts Institute of Technology    1985  */
        !             5: 
        !             6: #include "Xlibint.h"
        !             7: #include "X10.h"
        !             8: 
        !             9: /*
        !            10:  * XCreateAssocTable - Create an XAssocTable.  The size argument should be
        !            11:  * a power of two for efficiency reasons.  Some size suggestions: use 32
        !            12:  * buckets per 100 objects;  a reasonable maximum number of object per
        !            13:  * buckets is 8.  If there is an error creating the XAssocTable, a NULL
        !            14:  * pointer is returned.
        !            15:  */
        !            16: XAssocTable *XCreateAssocTable(size)
        !            17:        register int size;              /* Desired size of the table. */
        !            18: {
        !            19:        register XAssocTable *table;    /* XAssocTable to be initialized. */
        !            20:        register XAssoc *buckets;       /* Pointer to the first bucket in */
        !            21:                                        /* the bucket array. */
        !            22:        
        !            23:        /* XMalloc the XAssocTable. */
        !            24:        if ((table = (XAssocTable *)Xmalloc(sizeof(XAssocTable))) == NULL) {
        !            25:                /* XMalloc call failed! */
        !            26:                errno = ENOMEM;
        !            27:                return(NULL);
        !            28:        }
        !            29:        
        !            30:        /* XMalloc the buckets (actually just their headers). */
        !            31:        buckets = (XAssoc *)Xcalloc((unsigned)size, (unsigned)sizeof(XAssoc));
        !            32:        if (buckets == NULL) {
        !            33:                /* XCalloc call failed! */
        !            34:                errno = ENOMEM;
        !            35:                return(NULL);
        !            36:        }
        !            37: 
        !            38:        /* Insert table data into the XAssocTable structure. */
        !            39:        table->buckets = buckets;
        !            40:        table->size = size;
        !            41: 
        !            42:        while (--size >= 0) {
        !            43:                /* Initialize each bucket. */
        !            44:                buckets->prev = buckets;
        !            45:                buckets->next = buckets;
        !            46:                buckets++;
        !            47:        }
        !            48: 
        !            49:        return(table);
        !            50: }

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