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Annotation of 43BSD/contrib/X/Xlib/XLookUpAssoc.c, revision 1.1

1.1     ! root        1: #include <X/mit-copyright.h>
        !             2: 
        !             3: /* $Header: XLookUpAssoc.c,v 10.4 86/02/01 15:36:21 tony Rel $ */
        !             4: /* Copyright    Massachusetts Institute of Technology    1985  */
        !             5: 
        !             6: #include "XlibInternal.h"
        !             7: 
        !             8: /* 
        !             9:  * XLookUpAssoc - Retrieve the data stored in an XAssocTable by its XId.
        !            10:  * If an appropriately matching XId can be found in the table the routine will
        !            11:  * return apointer to the data associated with it. If the XId can not be found
        !            12:  * in the table the routine will return a NULL pointer.  All XId's are relative
        !            13:  * to the currently active Display.
        !            14:  */
        !            15: caddr_t XLookUpAssoc(table, x_id)
        !            16:        register XAssocTable *table;    /* XAssocTable to search in. */
        !            17:        register XId x_id;                      /* XId to search for. */
        !            18: {
        !            19:        int hash;
        !            20:        register XAssoc *bucket;
        !            21:        register XAssoc *entry;
        !            22: 
        !            23:        /* Hash the XId to get the bucket number. */
        !            24:        hash = x_id & (table->size - 1);
        !            25:        /* Look up the bucket to get the entries in that bucket. */
        !            26:        bucket = &(*table->table)[hash];
        !            27:        /* Get the first entry in the bucket. */
        !            28:        entry = bucket->next;
        !            29: 
        !            30:        /* Scan through the entries in the bucket for the right XId. */
        !            31:        for (entry; entry != bucket; entry = entry->next) {
        !            32:                if (entry->x_id == x_id) {
        !            33:                        /* We have the right XId. */
        !            34:                        if (entry->display == _XlibCurrentDisplay) {
        !            35:                                /* We have the right display. */
        !            36:                                /* We have the right entry! */
        !            37:                                return(entry->data);
        !            38:                        }
        !            39:                        /* Oops, identical XId's on different displays! */
        !            40:                        continue;
        !            41:                }
        !            42:                if (entry->x_id > x_id) {
        !            43:                        /* We have gone past where it should be. */
        !            44:                        /* It is apparently not in the table. */
        !            45:                        return(NULL);
        !            46:                }
        !            47:        }
        !            48:        /* It is apparently not in the table. */
        !            49:        return(NULL);
        !            50: }

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