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 #if defined(LIBC_SCCS) && !defined(lint) 35 #if 0 36 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 37 #endif 38 static const char rcsid[] = "$FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.2.2.2 2001/08/26 03:36:04 jkoshy Exp $"; 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 int opterr = 1, /* if error message should be printed */ 46 optind = 1, /* index into parent argv vector */ 47 optopt, /* character checked for validity */ 48 optreset; /* reset getopt */ 49 char *optarg; /* argument associated with option */ 50 51 #define BADCH (int)'?' 52 #define BADARG (int)':' 53 #define EMSG "" 54 55 /* 56 * getopt -- 57 * Parse argc/argv argument vector. 58 */ 59 int 60 getopt(nargc, nargv, ostr) 61 int nargc; 62 char * const *nargv; 63 const char *ostr; 64 { 65 extern char *__progname; 66 static char *place = EMSG; /* option letter processing */ 67 char *oli; /* option letter list index */ 68 69 if (optreset || !*place) { /* update scanning pointer */ 70 optreset = 0; 71 if (optind >= nargc || *(place = nargv[optind]) != '-') { 72 place = EMSG; 73 return (-1); 74 } 75 if (place[1] && *++place == '-') { /* found "--" */ 76 ++optind; 77 place = EMSG; 78 return (-1); 79 } 80 } /* option letter okay? */ 81 if ((optopt = (int)*place++) == (int)':' || 82 !(oli = strchr(ostr, optopt))) { 83 /* 84 * if the user didn't specify '-' as an option, 85 * assume it means -1. 86 */ 87 if (optopt == (int)'-') 88 return (-1); 89 if (!*place) 90 ++optind; 91 if (opterr && *ostr != ':' && optopt != BADCH) 92 (void)fprintf(stderr, 93 "%s: illegal option -- %c\n", __progname, optopt); 94 return (BADCH); 95 } 96 if (*++oli != ':') { /* don't need argument */ 97 optarg = NULL; 98 if (!*place) 99 ++optind; 100 } 101 else { /* need an argument */ 102 if (*place) /* no white space */ 103 optarg = place; 104 else if (nargc <= ++optind) { /* no arg */ 105 place = EMSG; 106 if (*ostr == ':') 107 return (BADARG); 108 if (opterr) 109 (void)fprintf(stderr, 110 "%s: option requires an argument -- %c\n", 111 __progname, optopt); 112 return (BADCH); 113 } 114 else /* white space */ 115 optarg = nargv[optind]; 116 place = EMSG; 117 ++optind; 118 } 119 return (optopt); /* dump back option letter */ 120 } 121