Mercurial > molko
view libmlk-util/mlk/util/openbsd/getopt.c @ 612:297fa28cac90
ui: simplify back
author | David Demelier <markand@malikania.fr> |
---|---|
date | Sun, 20 Aug 2023 10:48:57 +0200 |
parents | 4607eea0eabc |
children |
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/* * Copyright (c) 1987, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <stdio.h> #include <stdlib.h> #include <string.h> int mlk_util_opterr = 1, /* if error message should be printed */ mlk_util_optind = 1, /* index into parent argv vector */ mlk_util_optopt, /* character checked for validity */ mlk_util_optreset; /* reset getopt */ char *mlk_util_optarg; /* argument associated with option */ #define BADCH (int)'?' #define BADARG (int)':' #define EMSG "" /* * getopt -- * Parse argc/argv argument vector. */ int mlk_util_getopt(int nargc, char * const *nargv, const char *ostr) { static char *place = EMSG; /* option letter processing */ char *oli; /* option letter list index */ if (ostr == NULL) return (-1); if (mlk_util_optreset || !*place) { /* update scanning pointer */ mlk_util_optreset = 0; if (mlk_util_optind >= nargc || *(place = nargv[mlk_util_optind]) != '-') { place = EMSG; return (-1); } if (place[1] && *++place == '-') { /* found "--" */ ++mlk_util_optind; place = EMSG; return (-1); } } /* option letter okay? */ if ((mlk_util_optopt = (int)*place++) == (int)':' || !(oli = strchr(ostr, mlk_util_optopt))) { /* * if the user didn't specify '-' as an option, * assume it means -1. */ if (mlk_util_optopt == (int)'-') return (-1); if (!*place) ++mlk_util_optind; if (mlk_util_opterr && *ostr != ':') (void)fprintf(stderr, "illegal option -- %c\n", mlk_util_optopt); return (BADCH); } if (*++oli != ':') { /* don't need argument */ mlk_util_optarg = NULL; if (!*place) ++mlk_util_optind; } else { /* need an argument */ if (*place) /* no white space */ mlk_util_optarg = place; else if (nargc <= ++mlk_util_optind) { /* no arg */ place = EMSG; if (*ostr == ':') return (BADARG); if (mlk_util_opterr) (void)fprintf(stderr, "option requires an argument -- %c\n", mlk_util_optopt); return (BADCH); } else /* white space */ mlk_util_optarg = nargv[mlk_util_optind]; place = EMSG; ++mlk_util_optind; } return (mlk_util_optopt); /* dump back option letter */ }