getopt.c revision 84221
1/* 2 * Copyright (c) 1987, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: head/lib/libstand/getopt.c 84221 2001-09-30 22:28:01Z dillon $"); 36 37#if defined(LIBC_SCCS) && !defined(lint) 38static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 39#endif /* LIBC_SCCS and not lint */ 40 41#include "stand.h" 42#include <string.h> 43 44int opterr = 1, /* if error message should be printed */ 45 optind = 1, /* index into parent argv vector */ 46 optopt, /* character checked for validity */ 47 optreset; /* reset getopt */ 48char *optarg; /* argument associated with option */ 49 50#define BADCH (int)'?' 51#define BADARG (int)':' 52#define EMSG "" 53 54/* 55 * getopt -- 56 * Parse argc/argv argument vector. 57 */ 58int 59getopt(nargc, nargv, ostr) 60 int nargc; 61 char * const *nargv; 62 const char *ostr; 63{ 64 static char *place = EMSG; /* option letter processing */ 65 char *oli; /* option letter list index */ 66 67 if (optreset || !*place) { /* update scanning pointer */ 68 optreset = 0; 69 if (optind >= nargc || *(place = nargv[optind]) != '-') { 70 place = EMSG; 71 return (-1); 72 } 73 if (place[1] && *++place == '-') { /* found "--" */ 74 ++optind; 75 place = EMSG; 76 return (-1); 77 } 78 } /* option letter okay? */ 79 if ((optopt = (int)*place++) == (int)':' || 80 !(oli = strchr(ostr, optopt))) { 81 /* 82 * if the user didn't specify '-' as an option, 83 * assume it means -1. 84 */ 85 if (optopt == (int)'-') 86 return (-1); 87 if (!*place) 88 ++optind; 89 if (opterr && *ostr != ':') 90 (void)printf("illegal option -- %c\n", optopt); 91 return (BADCH); 92 } 93 if (*++oli != ':') { /* don't need argument */ 94 optarg = NULL; 95 if (!*place) 96 ++optind; 97 } 98 else { /* need an argument */ 99 if (*place) /* no white space */ 100 optarg = place; 101 else if (nargc <= ++optind) { /* no arg */ 102 place = EMSG; 103 if (*ostr == ':') 104 return (BADARG); 105 if (opterr) 106 (void)printf("option requires an argument -- %c\n", optopt); 107 return (BADCH); 108 } 109 else /* white space */ 110 optarg = nargv[optind]; 111 place = EMSG; 112 ++optind; 113 } 114 return (optopt); /* dump back option letter */ 115} 116