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Code Issues

b2sum: Support --help

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This commit is contained in:
Artem Chudinov 2015-10-30 19:12:14 +05:00
parent 625392b921
commit 918e39086b
1 changed files with 24 additions and 9 deletions
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33
b2sum/b2sum.c
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@ -228,12 +228,13 @@ cleanup_buffer:
typedef int ( *blake2fn )( FILE *, void * );
static void usage( char **argv )
static void usage( char **argv, int errcode )
{
fprintf( stderr, "Usage: %s [-a HASH] [FILE]...\n", argv[0] );
fprintf( stderr, "\tHASH in blake2b blake2s blake2bp blake2sp\n" );
fprintf( stderr, "\tWith no FILE, or when FILE is -, read standard input.\n" );
exit( 111 );
FILE *out = errcode ? stderr : stdout;
fprintf( out, "Usage: %s [-a HASH] [FILE]...\n", argv[0] );
fprintf( out, "\tHASH in blake2b blake2s blake2bp blake2sp\n" );
fprintf( out, "\tWith no FILE, or when FILE is -, read standard input.\n" );
exit( errcode );
}
@ -245,12 +246,22 @@ int main( int argc, char **argv )
int c;
opterr = 1;
if ( argc == 1 ) usage( argv ); /* show usage upon no-argument */
while( ( c = getopt( argc, argv, "a:" ) ) != -1 )
while( 1 )
{
int this_option_optind = optind ? optind : 1;
int option_index = 0;
static struct option long_options[] = {
{ "help", no_argument, 0, 0 },
{ NULL, 0, NULL, 0 }
};
c = getopt_long( argc, argv, "a:", long_options, &option_index );
if( c == -1 ) break;
switch( c )
{
case 0:
if( 0 == strcmp( "help", long_options[option_index].name ) )
usage( argv, 0 );
break;
case 'a':
if( 0 == strcmp( optarg, "blake2b" ) )
{
@ -275,10 +286,14 @@ int main( int argc, char **argv )
else
{
printf( "Invalid function name: `%s'\n", optarg );
usage( argv );
usage( argv, 111 );
}
break;
case '?':
usage( argv, 1 );
break;
}
}