list_rqs.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"
#include <signal.h>
#include <setjmp.h>
#include <sys/wait.h>

#ifdef lint     /* "lint returns a value which is sometimes ignored" */
#define DONT_USE(x)     x=x;
#else /* !lint */
#define DONT_USE(x)     ;
#endif /* lint */

static char const twentyfive_spaces[26] =
    "                         ";
static char const NL[2] = "\n";

void
ss_list_requests(int argc, const char * const *argv, int sci_idx,
                 void *info_ptr)
{
    ss_request_entry *entry;
    char const *const *name;
    int spacing;
    ss_request_table **table;

    char buffer[BUFSIZ];
    FILE *output;
    int fd;
#ifdef POSIX_SIGNALS
    struct sigaction nsig, osig;
    sigset_t nmask, omask;
#else
    int mask;
    void (*func)();
#endif
#ifndef WAIT_USES_INT
    union wait waitb;
#else
    int waitb;
#endif

    DONT_USE(argc);
    DONT_USE(argv);

#ifdef POSIX_SIGNALS
    sigemptyset(&nmask);
    sigaddset(&nmask, SIGINT);
    sigprocmask(SIG_BLOCK, &nmask, &omask);

    nsig.sa_handler = SIG_IGN;
    sigemptyset(&nsig.sa_mask);
    nsig.sa_flags = 0;
    sigaction(SIGINT, &nsig, &osig);
#else
    mask = sigblock(sigmask(SIGINT));
    func = signal(SIGINT, SIG_IGN);
#endif

    fd = ss_pager_create();     /* FD_CLOEXEC set */
    output = fdopen(fd, "w");

#ifdef POSIX_SIGNALS
    sigprocmask(SIG_SETMASK, &omask, (sigset_t *)0);
#else
    sigsetmask(mask);
#endif

    fprintf (output, "Available %s requests:\n\n",
             ss_info (sci_idx) -> subsystem_name);

    for (table = ss_info(sci_idx)->rqt_tables; *table; table++) {
        entry = (*table)->requests;
        for (; entry->command_names; entry++) {
            spacing = -2;
            buffer[0] = '\0';
            if (entry->flags & SS_OPT_DONT_LIST)
                continue;
            buffer[sizeof(buffer) - 1] = '\0';
            for (name = entry->command_names; *name; name++) {
                int len = strlen(*name);
                strncat(buffer, *name, sizeof(buffer) - 1 - strlen(buffer));
                spacing += len + 2;
                if (name[1]) {
                    strncat(buffer, ", ", sizeof(buffer) - 1 - strlen(buffer));
                }
            }
            if (spacing > 23) {
                strncat(buffer, NL, sizeof(buffer) - 1 - strlen(buffer));
                fputs(buffer, output);
                spacing = 0;
                buffer[0] = '\0';
            }
            strncat(buffer, twentyfive_spaces, sizeof(buffer) - 1 - (25-spacing));
            strncpy(buffer + 25, entry->info_string, sizeof(buffer) - 1 - 25);
            strncat(buffer, NL, sizeof(buffer) - 1 - strlen(buffer));
            fputs(buffer, output);
        }
    }
    fclose(output);
#ifndef NO_FORK
    wait(&waitb);
#endif
#ifdef POSIX_SIGNALS
    sigaction(SIGINT, &osig, (struct sigaction *)0);
#else
    (void) signal(SIGINT, func);
#endif
}