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Annotation of 43BSD/contrib/X/Xlib/XCreateAssoc.c, revision 1.1.1.1

1.1       root        1: #include <X/mit-copyright.h>
                      2: 
                      3: /* $Header: XCreateAssoc.c,v 10.5 86/02/01 15:31:04 tony Rel $ */
                      4: /* Copyright    Massachusetts Institute of Technology    1985  */
                      5: 
                      6: #include "XlibInternal.h"
                      7: 
                      8: char *malloc();
                      9: char *calloc();
                     10: /*
                     11:  * XCreateAssocTable - Create an XAssocTable.  The size argument should be
                     12:  * a power of two for efficiency reasons.  Some size suggestions: use 32
                     13:  * buckets per 100 objects;  a reasonable maximum number of object per
                     14:  * buckets is 8.  If there is an error creating the XAssocTable, a NULL
                     15:  * pointer is returned.
                     16:  */
                     17: XAssocTable *XCreateAssocTable(size)
                     18:        register int size;              /* Desired size of the table. */
                     19: {
                     20:        register XAssocTable *table;    /* XAssocTable to be initialized. */
                     21:        register XAssoc *bucket;        /* Pointer to a bucket in the table. */
                     22:        
                     23:        /* Malloc the XAssocTable. */
                     24:        if ((table = (XAssocTable *)malloc(sizeof(XAssocTable))) == NULL) {
                     25:                /* Malloc call failed! */
                     26:                errno = ENOMEM;
                     27:                return(NULL);
                     28:        }
                     29:        
                     30:        /* Malloc the bucket headers. */
                     31:        bucket = (XAssoc *)calloc(size, sizeof(XAssoc));
                     32:        if (bucket == NULL) {
                     33:                /* Calloc call failed! */
                     34:                errno = ENOMEM;
                     35:                return(NULL);
                     36:        }
                     37: 
                     38:        /* Insert table data into the XAssocTable structure. */
                     39:        table->table = (XAssoc (*)[])bucket;
                     40:        table->size = size;
                     41: 
                     42:        while (--size >= 0) {
                     43:                /* Initialize each bucket. */
                     44:                bucket->prev = bucket;
                     45:                bucket->next = bucket;
                     46:                bucket++;
                     47:        }
                     48: 
                     49:        return(table);
                     50: }

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