From d76eb9dd46081279642d3353f51ebc09fe4bbe9f Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Thu, 2 Apr 2020 20:03:32 +0200 Subject: Add a libcompat implementation of getopt Limited to the subset actually needed. Vaguely inspired by the NetBSD libc implementation. Signed-off-by: David Oberhollenzer --- lib/compat/getopt.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 lib/compat/getopt.c (limited to 'lib/compat/getopt.c') diff --git a/lib/compat/getopt.c b/lib/compat/getopt.c new file mode 100644 index 0000000..23ede4c --- /dev/null +++ b/lib/compat/getopt.c @@ -0,0 +1,70 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +/* + * getopt.c + * + * Copyright (C) 2019 David Oberhollenzer + */ +#include "config.h" +#include "compat.h" + +#include +#include +#include + +#ifndef HAVE_GETOPT +static char *current = ""; +int optind = 1; +char *optarg = NULL; + +int getopt(int argc, char *const argv[], const char *optstr) +{ + char optchr, *ptr; + + if (*current == '\0') { + if (optind >= argc || argv[optind][0] != '-') + return -1; + + if (argv[optind][1] == '-' && argv[optind][2] == '\0') { + ++optind; + return -1; + } + + if (argv[optind][1] == '\0') + return -1; + + current = argv[optind] + 1; + } + + optchr = *(current++); + if (optchr == ':' || (ptr = strchr(optstr, optchr)) == NULL) + goto fail_unknown; + + if (ptr[1] == ':') { + if (*current != '\0') { + optarg = current; + } else { + if (++optind >= argc) + goto fail_arg; + + optarg = argv[optind]; + } + + current = ""; + ++optind; + } else { + optarg = NULL; + + if (*current == '\0') + ++optind; + } + + return optchr; +fail_unknown: + fprintf(stderr, "%s: unknown option `-%c`\n", argv[0], optchr); + return '?'; +fail_arg: + fprintf(stderr, "%s: missing argument for option `-%c`\n", + argv[0], optchr); + return '?'; +} +#endif -- cgit v1.2.3