list_rqs.c revision 65f0aab98b20b5994a726ab90d355248bcddfffd 
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 "ss_internal.h"
14#include <signal.h>
15#include <setjmp.h>
16#include <sys/wait.h>
17
18typedef void sigret_t;
19
20static char const twentyfive_spaces[26] =
21    "                         ";
22static char const NL[2] = "\n";
23
24void ss_list_requests(int argc __SS_ATTR((unused)),
25		      const char * const *argv __SS_ATTR((unused)),
26		      int sci_idx, void *infop __SS_ATTR((unused)))
27{
28    ss_request_entry *entry;
29    char const * const *name;
30    int spacing;
31    ss_request_table **table;
32
33    char buffer[BUFSIZ];
34    FILE *output;
35    int fd;
36    sigset_t omask, igmask;
37    sigret_t (*func)(int);
38#ifndef NO_FORK
39    int waitb;
40#endif
41
42    sigemptyset(&igmask);
43    sigaddset(&igmask, SIGINT);
44    sigprocmask(SIG_BLOCK, &igmask, &omask);
45    func = signal(SIGINT, SIG_IGN);
46    fd = ss_pager_create();
47    output = fdopen(fd, "w");
48    sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0);
49
50    fprintf (output, "Available %s requests:\n\n",
51	     ss_info (sci_idx) -> subsystem_name);
52
53    for (table = ss_info(sci_idx)->rqt_tables; *table; table++) {
54        entry = (*table)->requests;
55        for (; entry->command_names; entry++) {
56            spacing = -2;
57            buffer[0] = '\0';
58            if (entry->flags & SS_OPT_DONT_LIST)
59                continue;
60            for (name = entry->command_names; *name; name++) {
61                int len = strlen(*name);
62                strncat(buffer, *name, len);
63                spacing += len + 2;
64                if (name[1]) {
65                    strcat(buffer, ", ");
66                }
67            }
68            if (spacing > 23) {
69                strcat(buffer, NL);
70                fputs(buffer, output);
71                spacing = 0;
72                buffer[0] = '\0';
73            }
74            strncat(buffer, twentyfive_spaces, 25-spacing);
75            strcat(buffer, entry->info_string);
76            strcat(buffer, NL);
77            fputs(buffer, output);
78        }
79    }
80    fclose(output);
81#ifndef NO_FORK
82    wait(&waitb);
83#endif
84    (void) signal(SIGINT, func);
85}
86