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Annotation of GNUtools/emacs/oldXMenu/XLookAssoc.c, revision 1.1

1.1     ! root        1: /* $XConsortium: XLookAssoc.c,v 10.16 91/01/06 12:09:24 rws Exp $ */
        !             2: /* Copyright    Massachusetts Institute of Technology    1985  */
        !             3: 
        !             4: /*
        !             5: Permission to use, copy, modify, distribute, and sell this software and its
        !             6: documentation for any purpose is hereby granted without fee, provided that
        !             7: the above copyright notice appear in all copies and that both that
        !             8: copyright notice and this permission notice appear in supporting
        !             9: documentation, and that the name of M.I.T. not be used in advertising or
        !            10: publicity pertaining to distribution of the software without specific,
        !            11: written prior permission.  M.I.T. makes no representations about the
        !            12: suitability of this software for any purpose.  It is provided "as is"
        !            13: without express or implied warranty.
        !            14: */
        !            15: 
        !            16: #include "X11/Xlib.h"
        !            17: #include "X10.h"
        !            18: 
        !            19: #ifndef NULL
        !            20: #define NULL 0
        !            21: #endif
        !            22: 
        !            23: /* 
        !            24:  * XLookUpAssoc - Retrieve the data stored in an XAssocTable by its XId.
        !            25:  * If an appropriately matching XId can be found in the table the routine will
        !            26:  * return apointer to the data associated with it. If the XId can not be found
        !            27:  * in the table the routine will return a NULL pointer.  All XId's are relative
        !            28:  * to the currently active Display.
        !            29:  */
        !            30: caddr_t XLookUpAssoc(dpy, table, x_id)
        !            31:         register Display *dpy;
        !            32:        register XAssocTable *table;    /* XAssocTable to search in. */
        !            33:        register XID x_id;                      /* XId to search for. */
        !            34: {
        !            35:        int hash;
        !            36:        register XAssoc *bucket;
        !            37:        register XAssoc *Entry;
        !            38: 
        !            39:        /* Hash the XId to get the bucket number. */
        !            40:        hash = x_id & (table->size - 1);
        !            41:        /* Look up the bucket to get the entries in that bucket. */
        !            42:        bucket = &table->buckets[hash];
        !            43:        /* Get the first entry in the bucket. */
        !            44:        Entry = bucket->next;
        !            45: 
        !            46:        /* Scan through the entries in the bucket for the right XId. */
        !            47:        for (; Entry != bucket; Entry = Entry->next) {
        !            48:                if (Entry->x_id == x_id) {
        !            49:                        /* We have the right XId. */
        !            50:                        if (Entry->display == dpy) {
        !            51:                                /* We have the right display. */
        !            52:                                /* We have the right entry! */
        !            53:                                return(Entry->data);
        !            54:                        }
        !            55:                        /* Oops, identical XId's on different displays! */
        !            56:                        continue;
        !            57:                }
        !            58:                if (Entry->x_id > x_id) {
        !            59:                        /* We have gone past where it should be. */
        !            60:                        /* It is apparently not in the table. */
        !            61:                        return(NULL);
        !            62:                }
        !            63:        }
        !            64:        /* It is apparently not in the table. */
        !            65:        return(NULL);
        !            66: }
        !            67: 

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