diff options
| author | Sami Kerola | 2017-05-09 20:10:51 +0200 |
|---|---|---|
| committer | Karel Zak | 2017-05-10 10:53:28 +0200 |
| commit | 105bb8572f5eddd3e196363ee18a0d210990905f (patch) | |
| tree | a3927e21aade6e9c91cceacb0657405e2b22c5bf /sys-utils/switch_root.c | |
| parent | vipw: use getopt_long() to parse options (diff) | |
| download | kernel-qcow2-util-linux-105bb8572f5eddd3e196363ee18a0d210990905f.tar.gz kernel-qcow2-util-linux-105bb8572f5eddd3e196363ee18a0d210990905f.tar.xz kernel-qcow2-util-linux-105bb8572f5eddd3e196363ee18a0d210990905f.zip | |
switch_root: use getopt_long() to parse options
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
Diffstat (limited to 'sys-utils/switch_root.c')
| -rw-r--r-- | sys-utils/switch_root.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/sys-utils/switch_root.c b/sys-utils/switch_root.c index 2b42ddf85..7bd07783e 100644 --- a/sys-utils/switch_root.c +++ b/sys-utils/switch_root.c @@ -33,6 +33,7 @@ #include <errno.h> #include <ctype.h> #include <dirent.h> +#include <getopt.h> #include "c.h" #include "nls.h" @@ -217,14 +218,25 @@ static void __attribute__((__noreturn__)) usage(FILE *output) int main(int argc, char *argv[]) { char *newroot, *init, **initargs; + int c; + static const struct option longopts[] = { + {"version", no_argument, NULL, 'V'}, + {"help", no_argument, NULL, 'h'}, + {NULL, 0, NULL, 0} + }; + atexit(close_stdout); - if (argv[1] && (!strcmp(argv[1], "--help") || !strcmp(argv[1], "-h"))) - usage(stdout); - if (argv[1] && (!strcmp(argv[1], "--version") || !strcmp(argv[1], "-V"))) { - printf(UTIL_LINUX_VERSION); - return EXIT_SUCCESS; - } + while ((c = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1) + switch (c) { + case 'V': + printf(UTIL_LINUX_VERSION); + return EXIT_SUCCESS; + case 'h': + usage(stdout); + default: + errtryhelp(EXIT_FAILURE); + } if (argc < 3) usage(stderr); |