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Diffstat (limited to '')
| -rw-r--r-- | src/arg.h | 114 |
1 files changed, 78 insertions, 36 deletions
@@ -1,41 +1,83 @@ -/* - * Copy me if you can. - * by 20h +/** + * 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. */ -#ifndef ARG_H__ -#define ARG_H__ + +/** + * The name of the process. + */ extern char *argv0; -/* use main(int argc, char *argv[]) */ -#define ARGBEGIN for (argv0 = *argv, argv++, argc--;\ - argv[0] && argv[0][1]\ - && argv[0][0] == '-';\ - argc--, argv++) {\ - char argc_;\ - char **argv_;\ - int brk_;\ - if (argv[0][1] == '-' && argv[0][2] == '\0') {\ - argv++;\ - argc--;\ - break;\ - }\ - for (brk_ = 0, argv[0]++, argv_ = argv;\ - argv[0][0] && !brk_;\ - argv[0]++) {\ - if (argv_ != argv)\ - break;\ - argc_ = argv[0][0];\ - switch (argc_) - -#define ARGEND }\ - } - -#define ARGF() ((argv[0][1] == '\0' && argv[1] == NULL)?\ - (char *)0 :\ - (brk_ = 1, (argv[0][1] != '\0')?\ - (&argv[0][1]) :\ - (argc--, argv++, argv[0]))) - -#endif + + +/** + * 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)))) + |