1#pragma ident	"%Z%%M%	%I%	%E% SMI"
2
3/*
4 * This file is part of libdyn.a, the C Dynamic Object library.  It
5 * contains the source code for the function DynInsert().
6 *
7 * There are no restrictions on this code; however, if you make any
8 * changes, I request that you document them so that I do not get
9 * credit or blame for your modifications.
10 *
11 * Written by Barr3y Jaspan, Student Information Processing Board (SIPB)
12 * and MIT-Project Athena, 1989.
13 */
14
15#include <stdio.h>
16#include <strings.h>
17#include "dynP.h"
18
19int DynInsert(obj, idx, els_in, num)
20   DynObjectP obj;
21   void *els_in;
22   int idx, num;
23{
24     DynPtr els = (DynPtr) els_in;
25     int ret;
26
27     if (idx < 0 || idx > obj->num_el) {
28	  if (obj->debug)
29	       fprintf(stderr, "dyn: insert: index %d is not in [0,%d]\n",
30		       idx, obj->num_el);
31	  return DYN_BADINDEX;
32     }
33
34     if (num < 1) {
35	  if (obj->debug)
36	       fprintf(stderr, "dyn: insert: cannot insert %d elements\n",
37		       num);
38	  return DYN_BADVALUE;
39     }
40
41     if (obj->debug)
42	  fprintf(stderr,"dyn: insert: Moving %d bytes from %d + %d to + %d\n",
43		  (obj->num_el-idx)*obj->el_size, obj->array,
44		  obj->el_size*idx, obj->el_size*(idx+num));
45
46     if ((ret = _DynResize(obj, obj->num_el + num)) != DYN_OK)
47	  return ret;
48#ifdef HAVE_MEMMOVE
49     memmove(obj->array + obj->el_size*(idx + num),
50	     obj->array + obj->el_size*idx,
51	     (obj->num_el-idx)*obj->el_size);
52#else
53     bcopy(obj->array + obj->el_size*idx,
54	   obj->array + obj->el_size*(idx + num),
55	   (obj->num_el-idx)*obj->el_size);
56#endif
57
58     if (obj->debug)
59	  fprintf(stderr, "dyn: insert: Copying %d bytes from %d to %d + %d\n",
60		  obj->el_size*num, els, obj->array, obj->el_size*idx);
61
62#ifdef HAVE_MEMMOVE
63     memmove(obj->array + obj->el_size*idx, els, obj->el_size*num);
64#else
65     bcopy(els, obj->array + obj->el_size*idx, obj->el_size*num);
66#endif
67     obj->num_el += num;
68
69     if (obj->debug)
70	  fprintf(stderr, "dyn: insert: done.\n");
71
72     return DYN_OK;
73}
74