swapoff: cleanup usage() and includes

[thirdparty/util-linux.git] / sys-utils / swapoff.c

diff --git a/sys-utils/swapoff.c b/sys-utils/swapoff.c
index 8482026a97131ee8569e6692ea831830f17073c6..0bd85ac9c70d01a47f748577886133e87c6650d5 100644 (file)
--- a/sys-utils/swapoff.c
+++ b/sys-utils/swapoff.c
@@ -1,16 +1,6 @@
-#include <stdlib.h>
 #include <stdio.h>
-#include <getopt.h>
-#include <string.h>
-#include <mntent.h>
 #include <errno.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <fcntl.h>
-#include <stdint.h>
-#include <ctype.h>
+#include <getopt.h>
 
 #ifdef HAVE_SYS_SWAP_H
 # include <sys/swap.h>
@@ -71,16 +61,19 @@ static int swapoff_by_uuid(const char *uuid, int quiet)
        return special ? do_swapoff(special, quiet, CANONIC) : cannot_find(uuid);
 }
 
-static void usage(FILE *out, int n)
+static void __attribute__ ((__noreturn__)) usage(FILE * out)
 {
-       fputs(_("\nUsage:\n"), out);
+       fputs(USAGE_HEADER, out);
+
        fprintf(out, _(" %s [options] [<spec>]\n"), program_invocation_short_name);
 
-       fputs(_("\nOptions:\n"), out);
+       fputs(USAGE_OPTIONS, out);
        fputs(_(" -a, --all              disable all swaps from /proc/swaps\n"
-               " -h, --help             display help and exit\n"
-               " -v, --verbose          verbose mode\n"
-               " -V, --version          display version and exit\n"), out);
+               " -v, --verbose          verbose mode\n"), out);
+
+       fputs(USAGE_SEPARATOR, out);
+       fputs(USAGE_HELP, out);
+       fputs(USAGE_VERSION, out);
 
        fputs(_("\nThe <spec> parameter:\n" \
                " -L <label>             LABEL of device to be used\n" \
@@ -88,8 +81,10 @@ static void usage(FILE *out, int n)
                " LABEL=<label>          LABEL of device to be used\n" \
                " UUID=<uuid>            UUID of device to be used\n" \
                " <device>               name of device to be used\n" \
-               " <file>                 name of file to be used\n\n"), out);
-       exit(n);
+               " <file>                 name of file to be used\n"), out);
+
+       fprintf(out, USAGE_MAN_TAIL("swapoff(8)"));
+       exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
 }
 
 static int swapoff_all(void)
@@ -155,7 +150,7 @@ int main(int argc, char *argv[])
                        ++all;
                        break;
                case 'h':               /* help */
-                       usage(stdout, 0);
+                       usage(stdout);
                        break;
                case 'v':               /* be chatty */
                        ++verbose;
@@ -169,17 +164,15 @@ int main(int argc, char *argv[])
                case 'U':
                        add_uuid(optarg);
                        break;
-               case 0:
-                       break;
                case '?':
                default:
-                       usage(stderr, 1);
+                       usage(stderr);
                }
        }
        argv += optind;
 
        if (!all && !numof_labels() && !numof_uuids() && *argv == NULL)
-               usage(stderr, 2);
+               usage(stderr);
 
        mnt_init_debug(0);
        mntcache = mnt_new_cache();