[PATCH v1] erofs-utils: introduce long parameter option

[Gao Xiang]

Hi Guifu,

On Tue, Oct 22, 2019 at 02:19:23AM +0800, Li Guifu wrote:
> From: Li Guifu <blucerlee at gmail.com>
> 
> Only --help|-h is uesed right now

                    ^
typo in the commit message.


> 
> Signed-off-by: Li Guifu <blucerlee at gmail.com>
> ---
>  mkfs/main.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/mkfs/main.c b/mkfs/main.c
> index 71c81f5..f62b065 100644
> --- a/mkfs/main.c
> +++ b/mkfs/main.c
> @@ -13,6 +13,8 @@
>  #include <limits.h>
>  #include <libgen.h>
>  #include <sys/stat.h>
> +#include <getopt.h>
> +
>  #include "erofs/config.h"
>  #include "erofs/print.h"
>  #include "erofs/cache.h"
> @@ -23,10 +25,16 @@
>  
>  #define EROFS_SUPER_END (EROFS_SUPER_OFFSET + sizeof(struct erofs_super_block))
>  
> +static struct option long_options[] = {
> +	{"help", no_argument, 0, 'h'},


How about removing '-h' from help message?
Thus we can keep '-h' for later usage instead of just print messages.

like,
	{"help", no_argument, 0, 1},


> +	{0, 0, 0, 0},
> +};
> +
>  static void usage(void)
>  {
>  	fprintf(stderr, "usage: [options] FILE DIRECTORY\n\n");
>  	fprintf(stderr, "Generate erofs image from DIRECTORY to FILE, and [options] are:\n");
> +	fprintf(stderr, " -h|--help print usage message then exit 0\n");

How about moving it to the last line with the following change?

	                "--help     display this help and exit"

and can we merge all fprintf into one line?


>  	fprintf(stderr, " -zX[,Y]   X=compressor (Y=compression level, optional)\n");
>  	fprintf(stderr, " -d#       set output message level to # (maximum 9)\n");
>  	fprintf(stderr, " -x#       set xattr tolerance to # (< 0, disable xattrs; default 2)\n");
> @@ -95,8 +103,10 @@ static int mkfs_parse_options_cfg(int argc, char *argv[])
>  {
>  	char *endptr;
>  	int opt, i;
> +	int option_index = 0;
>  
> -	while ((opt = getopt(argc, argv, "d:x:z:E:T:")) != -1) {
> +	while((opt = getopt_long(argc, argv, "d:z:E:T:h", long_options,

	while((opt = getopt_long(argc, argv, "d:z:E:T:", long_options,

> +				 &option_index)) != -1) {
>  		switch (opt) {
>  		case 'z':
>  			if (!optarg) {
> @@ -146,6 +156,11 @@ static int mkfs_parse_options_cfg(int argc, char *argv[])
>  			}
>  			break;
>  
> +		case 'h':

		case 1:

> +		case '?':

remove this line.
If you don't care, I can post a modified version here.

Thanks,
Gao Xiang

> +			usage();
> +			exit(0);
> +
>  		default: /* '?' */
>  			return -EINVAL;
>  		}
> -- 
> 2.17.1
>