request_tbl.c

/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 * Copyright 1987, 1988 by MIT Student Information Processing Board
 *
 * For copyright information, see copyright.h.
 */

#include "copyright.h"
#include "ss_internal.h"

#define ssrt ss_request_table   /* for some readable code... */

void
ss_add_request_table(int sci_idx, ssrt *rqtbl_ptr, int position, int *code_ptr)
{
    ss_data *info;
    int i, size;

    info = ss_info(sci_idx);
    for (size=0; info->rqt_tables[size] != (ssrt *)NULL; size++)
        ;
    /* size == C subscript of NULL == #elements */
    size += 2;              /* new element, and NULL */
    info->rqt_tables = (ssrt **)realloc(info->rqt_tables,
                                        size*sizeof(ssrt *));
    if (info->rqt_tables == (ssrt **)NULL) {
        *code_ptr = errno;
        return;
    }
    if (position > size - 2)
        position = size - 2;

    if (size > 1)
        for (i = size - 2; i >= position; i--)
            info->rqt_tables[i+1] = info->rqt_tables[i];

    info->rqt_tables[position] = rqtbl_ptr;
    info->rqt_tables[size-1] = (ssrt *)NULL;
    *code_ptr = 0;
}

void
ss_delete_request_table(int sci_idx, ssrt *rqtbl_ptr, int *code_ptr)
{
    ss_data *info;
    ssrt **rt1, **rt2;

    *code_ptr = SS_ET_TABLE_NOT_FOUND;
    info = ss_info(sci_idx);
    rt1 = info->rqt_tables;
    for (rt2 = rt1; *rt1; rt1++) {
        if (*rt1 != rqtbl_ptr) {
            *rt2++ = *rt1;
            *code_ptr = 0;
        }
    }
    *rt2 = (ssrt *)NULL;
    return;
}