/**
* Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/**
* The name of the process.
*/
extern char *argv0;
/**
* Start command line parsing.
*
* `argv` and `argc` must be available as given to `main`.
* The global variable `argv0` must be declare (not necessary
* the the same file) and will be set to `argv[0]`.
*
* Only short options and "--" are supported. Short options
* may start with a '+', in which case `plus` will be 1.
*
* @example
* ARGBEGIN {
* case 'a': printf("%s\n", plus ? "+a" : "-a"); break;
* case 'b': if (plus) usage(1); printf("-b\n"); break;
* case 'c': if (plus) printf("+c\n"); else printf("-c %s\n", ARGF()); break;
* default: usage(1); break;
* } ARGEND;
*/
#define ARGBEGIN \
do { \
for (argv0 = *argv++, argc -= !!argv0; *argv; argv++, argc--) { \
int plus = argv[0][0] == '+', next__ = 0; \
if (((argv[0][0] != '-') && !plus) || (argv[0][1] == (plus ? '+' : '-'))) { \
if ((argv[0][0] == argv[0][1]) && (argv[0][1] == '-') && (argv[0][2] == '\0')) \
argc--, argv++; \
break; \
} \
for (argv[0]++; argv[0][0] && !next__;) { \
switch (*(argv[0])++)
/**
* End of command line parsing,
*/
#define ARGEND \
} \
} \
} while (0)
/**
* Get the argument of the current option.
* Do not use more once per option.
*
* The function `noreturn void usage(int)` must be available.
* `usage` shall exit if its argument is `1`.
*
* @return The argument of the current option.
*/
#define ARGF() \
(next__ = 1, argv[0][0] ? (argv[0]) \
: (argv++, (argv[0] ? (argc--, argv[0]) \
: (usage(1), NULL))))
