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
18 typedef void sigret_t;
19
20 static char const twentyfive_spaces[26] =
21 " ";
22 static char const NL[2] = "\n";
23
ss_list_requests(int argc __SS_ATTR ((unused)),const char * const * argv __SS_ATTR ((unused)),int sci_idx,void * infop __SS_ATTR ((unused)))24 void 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