list_rqs.c revision d1154eb460efe588eaed3d439c1caaca149fa362 
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#include "config.h"
14#include "ss_internal.h"
15#include <signal.h>
16#include <setjmp.h>
17#include <sys/wait.h>
18
19typedef void sigret_t;
20
21static char const twentyfive_spaces[26] =
22    "                         ";
23static char const NL[2] = "\n";
24
25void ss_list_requests(int argc __SS_ATTR((unused)),
26		      const char * const *argv __SS_ATTR((unused)),
27		      int sci_idx, void *infop __SS_ATTR((unused)))
28{
29    ss_request_entry *entry;
30    char const * const *name;
31    int spacing;
32    ss_request_table **table;
33
34    char buffer[BUFSIZ];
35    FILE *output;
36    int fd;
37    sigset_t omask, igmask;
38    sigret_t (*func)(int);
39#ifndef NO_FORK
40    int waitb;
41#endif
42
43    sigemptyset(&igmask);
44    sigaddset(&igmask, SIGINT);
45    sigprocmask(SIG_BLOCK, &igmask, &omask);
46    func = signal(SIGINT, SIG_IGN);
47    fd = ss_pager_create();
48    output = fdopen(fd, "w");
49    sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0);
50
51    fprintf (output, "Available %s requests:\n\n",
52	     ss_info (sci_idx) -> subsystem_name);
53
54    for (table = ss_info(sci_idx)->rqt_tables; *table; table++) {
55        entry = (*table)->requests;
56        for (; entry->command_names; entry++) {
57            spacing = -2;
58            buffer[0] = '\0';
59            if (entry->flags & SS_OPT_DONT_LIST)
60                continue;
61            for (name = entry->command_names; *name; name++) {
62                int len = strlen(*name);
63                strncat(buffer, *name, len);
64                spacing += len + 2;
65                if (name[1]) {
66                    strcat(buffer, ", ");
67                }
68            }
69            if (spacing > 23) {
70                strcat(buffer, NL);
71                fputs(buffer, output);
72                spacing = 0;
73                buffer[0] = '\0';
74            }
75            strncat(buffer, twentyfive_spaces, 25-spacing);
76            strcat(buffer, entry->info_string);
77            strcat(buffer, NL);
78            fputs(buffer, output);
79        }
80    }
81    fclose(output);
82#ifndef NO_FORK
83    wait(&waitb);
84#endif
85    (void) signal(SIGINT, func);
86}
87