list_rqs.c revision 18a1444b4f1e6a0948fd38fa0de382d86cfe04de 
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    if (fd < 0) {
48        perror("ss_pager_create");
49        (void) signal(SIGINT, func);
50        return;
51    }
52    output = fdopen(fd, "w");
53    sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0);
54
55    fprintf (output, "Available %s requests:\n\n",
56	     ss_info (sci_idx) -> subsystem_name);
57
58    for (table = ss_info(sci_idx)->rqt_tables; *table; table++) {
59        entry = (*table)->requests;
60        for (; entry->command_names; entry++) {
61            spacing = -2;
62            buffer[0] = '\0';
63            if (entry->flags & SS_OPT_DONT_LIST)
64                continue;
65            for (name = entry->command_names; *name; name++) {
66                int len = strlen(*name);
67                strncat(buffer, *name, len);
68                spacing += len + 2;
69                if (name[1]) {
70                    strcat(buffer, ", ");
71                }
72            }
73            if (spacing > 23) {
74                strcat(buffer, NL);
75                fputs(buffer, output);
76                spacing = 0;
77                buffer[0] = '\0';
78            }
79            strncat(buffer, twentyfive_spaces, 25-spacing);
80            strcat(buffer, entry->info_string);
81            strcat(buffer, NL);
82            fputs(buffer, output);
83        }
84    }
85    fclose(output);
86#ifndef NO_FORK
87    wait(&waitb);
88#endif
89    (void) signal(SIGINT, func);
90}
91