1 /*
2 * Copyright 1987, 1988 by MIT Student Information Processing Board
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose is hereby granted, provided that
6 * the names of M.I.T. and the M.I.T. S.I.P.B. not be used in
7 * advertising or publicity pertaining to distribution of the software
8 * without specific, written prior permission. M.I.T. and the
9 * M.I.T. S.I.P.B. make no representations about the suitability of
10 * this software for any purpose. It is provided "as is" without
11 * express or implied warranty.
12 */
13
14 #ifdef HAVE_ERRNO_H
15 #include <errno.h>
16 #endif
17
18 #include "ss_internal.h"
19
20 #define ssrt ss_request_table /* for some readable code... */
21
ss_add_request_table(int sci_idx,ssrt * rqtbl_ptr,int position,int * code_ptr)22 void ss_add_request_table(int sci_idx, ssrt *rqtbl_ptr, int position, int *code_ptr)
23 {
24 register ss_data *info;
25 register int i, size;
26 ssrt **t;
27
28 info = ss_info(sci_idx);
29 for (size=0; info->rqt_tables[size] != (ssrt *)NULL; size++)
30 ;
31 /* size == C subscript of NULL == #elements */
32 size += 2; /* new element, and NULL */
33 t = (ssrt **)realloc(info->rqt_tables, (unsigned)size*sizeof(ssrt *));
34 if (t == (ssrt **)NULL) {
35 *code_ptr = errno;
36 return;
37 }
38 info->rqt_tables = t;
39 if (position > size - 2)
40 position = size - 2;
41
42 if (size > 1)
43 for (i = size - 2; i >= position; i--)
44 info->rqt_tables[i+1] = info->rqt_tables[i];
45
46 info->rqt_tables[position] = rqtbl_ptr;
47 info->rqt_tables[size-1] = (ssrt *)NULL;
48 *code_ptr = 0;
49 }
50
ss_delete_request_table(int sci_idx,ssrt * rqtbl_ptr,int * code_ptr)51 void ss_delete_request_table(int sci_idx, ssrt *rqtbl_ptr, int *code_ptr)
52 {
53 register ss_data *info;
54 register ssrt **rt1, **rt2;
55
56 *code_ptr = SS_ET_TABLE_NOT_FOUND;
57 info = ss_info(sci_idx);
58 rt1 = info->rqt_tables;
59 for (rt2 = rt1; *rt1; rt1++) {
60 if (*rt1 != rqtbl_ptr) {
61 *rt2++ = *rt1;
62 *code_ptr = 0;
63 }
64 }
65 *rt2 = (ssrt *)NULL;
66 return;
67 }
68