getopt.c (4230B)
1 /* $NetBSD: getopt.c,v 1.16 1999/12/02 13:15:56 kleink Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993, 1994, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the names of the copyright holders nor the names of its 16 * contributors may be used to endorse or promote products derived from 17 * this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS 20 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE 23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #if 0 33 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; 34 #endif 35 36 #include <assert.h> 37 #include <errno.h> 38 #include <stdio.h> 39 #include <string.h> 40 41 #define __P(x) x 42 #define _DIAGASSERT(x) assert(x) 43 44 #ifdef __weak_alias 45 __weak_alias(getopt,_getopt); 46 #endif 47 48 49 int opterr = 1, /* if error message should be printed */ 50 optind = 1, /* index into parent argv vector */ 51 optopt, /* character checked for validity */ 52 optreset; /* reset getopt */ 53 char *optarg; /* argument associated with option */ 54 55 static char * _progname __P((char *)); 56 int getopt_internal __P((int, char * const *, const char *)); 57 58 static char * 59 _progname(nargv0) 60 char * nargv0; 61 { 62 char * tmp; 63 64 _DIAGASSERT(nargv0 != NULL); 65 66 tmp = strrchr(nargv0, '/'); 67 if (tmp) 68 tmp++; 69 else 70 tmp = nargv0; 71 return(tmp); 72 } 73 74 #define BADCH (int)'?' 75 #define BADARG (int)':' 76 #define EMSG "" 77 78 /* 79 * getopt -- 80 * Parse argc/argv argument vector. 81 */ 82 int 83 getopt(nargc, nargv, ostr) 84 int nargc; 85 char * const nargv[]; 86 const char *ostr; 87 { 88 static char *__progname = 0; 89 static char *place = EMSG; /* option letter processing */ 90 char *oli; /* option letter list index */ 91 __progname = __progname?__progname:_progname(*nargv); 92 93 _DIAGASSERT(nargv != NULL); 94 _DIAGASSERT(ostr != NULL); 95 96 if (optreset || !*place) { /* update scanning pointer */ 97 optreset = 0; 98 if (optind >= nargc || *(place = nargv[optind]) != '-') { 99 place = EMSG; 100 return (-1); 101 } 102 if (place[1] && *++place == '-' /* found "--" */ 103 && place[1] == '\0') { 104 ++optind; 105 place = EMSG; 106 return (-1); 107 } 108 } /* option letter okay? */ 109 if ((optopt = (int)*place++) == (int)':' || 110 !(oli = strchr(ostr, optopt))) { 111 /* 112 * if the user didn't specify '-' as an option, 113 * assume it means -1. 114 */ 115 if (optopt == (int)'-') 116 return (-1); 117 if (!*place) 118 ++optind; 119 if (opterr && *ostr != ':') 120 (void)fprintf(stderr, 121 "%s: illegal option -- %c\n", __progname, optopt); 122 return (BADCH); 123 } 124 if (*++oli != ':') { /* don't need argument */ 125 optarg = NULL; 126 if (!*place) 127 ++optind; 128 } 129 else { /* need an argument */ 130 if (*place) /* no white space */ 131 optarg = place; 132 else if (nargc <= ++optind) { /* no arg */ 133 place = EMSG; 134 if (*ostr == ':') 135 return (BADARG); 136 if (opterr) 137 (void)fprintf(stderr, 138 "%s: option requires an argument -- %c\n", 139 __progname, optopt); 140 return (BADCH); 141 } 142 else /* white space */ 143 optarg = nargv[optind]; 144 place = EMSG; 145 ++optind; 146 } 147 return (optopt); /* dump back option letter */ 148 }