库解析参数GNU风格? [英] Library for parsing arguments GNU-style?
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问题描述
我注意到大多数GNU核心应用基本的风格,由此参数是:
I've noticed the basic 'style' of most GNU core applications whereby arguments are:
-
- longoption
-
- longoption =值
或- longoption值
-
-abcdefg
(多个选项) -
-iuwww数据
(选项I
,U = www数据
)
--longoption
--longoption=value
or--longoption value
-abcdefg
(multiple options)-iuwww-data
(optioni
,u = www-data
)
他们按照上面的风格。我想避免编写参数解析器,如果有,这是否使用上述样式库。有没有一个你知道的?
They follow the above style. I want to avoid writing an argument parser if there's a library that does this using the above style. Is there one you know of?
推荐答案
getopt_long will do the job, here is an example from http://www.gnu.org/s/libc/manual/html_node/Getopt-Long-Option-Example.html
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
/* Flag set by ‘--verbose’. */
static int verbose_flag;
int
main (argc, argv)
int argc;
char **argv;
{
int c;
while (1)
{
static struct option long_options[] =
{
/* These options set a flag. */
{"verbose", no_argument, &verbose_flag, 1},
{"brief", no_argument, &verbose_flag, 0},
/* These options don't set a flag.
We distinguish them by their indices. */
{"add", no_argument, 0, 'a'},
{"append", no_argument, 0, 'b'},
{"delete", required_argument, 0, 'd'},
{"create", required_argument, 0, 'c'},
{"file", required_argument, 0, 'f'},
{0, 0, 0, 0}
};
/* getopt_long stores the option index here. */
int option_index = 0;
c = getopt_long (argc, argv, "abc:d:f:",
long_options, &option_index);
/* Detect the end of the options. */
if (c == -1)
break;
switch (c)
{
case 0:
/* If this option set a flag, do nothing else now. */
if (long_options[option_index].flag != 0)
break;
printf ("option %s", long_options[option_index].name);
if (optarg)
printf (" with arg %s", optarg);
printf ("\n");
break;
case 'a':
puts ("option -a\n");
break;
case 'b':
puts ("option -b\n");
break;
case 'c':
printf ("option -c with value `%s'\n", optarg);
break;
case 'd':
printf ("option -d with value `%s'\n", optarg);
break;
case 'f':
printf ("option -f with value `%s'\n", optarg);
break;
case '?':
/* getopt_long already printed an error message. */
break;
default:
abort ();
}
}
/* Instead of reporting ‘--verbose’
and ‘--brief’ as they are encountered,
we report the final status resulting from them. */
if (verbose_flag)
puts ("verbose flag is set");
/* Print any remaining command line arguments (not options). */
if (optind < argc)
{
printf ("non-option ARGV-elements: ");
while (optind < argc)
printf ("%s ", argv[optind++]);
putchar ('\n');
}
exit (0);
}
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