getopt.c (4056B)
1 /* $Id: //depot/blt/lib/libposix/getopt.c#1 $ 2 ** OpenBSD: getopt.c,v 1.2 1996/08/19 08:33:32 tholo Exp $ 3 ** 4 ** Copyright (c) 1987, 1993, 1994 5 ** The Regents of the University of California. All rights reserved. 6 ** Copyright 1999 Sidney Cammeresi. 7 ** All rights reserved. 8 ** 9 ** Redistribution and use in source and binary forms, with or without 10 ** modification, are permitted provided that the following conditions 11 ** are met: 12 ** 13 ** 1. Redistributions of source code must retain the above copyright 14 ** notice, this list of conditions and the following disclaimer. 15 ** 2. Redistributions in binary form must reproduce the above copyright 16 ** notice, this list of conditions and the following disclaimer in the 17 ** documentation and/or other materials provided with the distribution. 18 ** 3. All advertising materials mentioning features or use of this software 19 ** must display the following acknowledgement: 20 ** This product includes software developed by the University of 21 ** California, Berkeley and its contributors. 22 ** 4. Neither the name of the University nor the names of its contributors 23 ** may be used to endorse or promote products derived from this software 24 ** without specific prior written permission. 25 ** 26 ** THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 ** ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 ** SUCH DAMAGE. 37 */ 38 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 #include <blt/libsyms.h> 44 45 weak_alias (_getopt, getopt) 46 47 int opterr = 1, /* if error message should be printed */ 48 optind = 1, /* index into parent argv vector */ 49 optopt, /* character checked for validity */ 50 optreset; /* reset getopt */ 51 char *optarg; /* argument associated with option */ 52 53 extern char *__progname; 54 55 #define BADCH (int)'?' 56 #define BADARG (int)':' 57 #define EMSG "" 58 59 #define fprintf(file, format, a...) _printf (format, ## a) 60 61 /* 62 * getopt -- 63 * Parse argc/argv argument vector. 64 */ 65 int _getopt (int nargc, char * const *nargv, const char *ostr) 66 { 67 static char *place = EMSG; /* option letter processing */ 68 char *oli; /* option letter list index */ 69 70 if (optreset || !*place) { /* update scanning pointer */ 71 optreset = 0; 72 if (optind >= nargc || *(place = nargv[optind]) != '-') { 73 place = EMSG; 74 return (-1); 75 } 76 if (place[1] && *++place == '-') { /* found "--" */ 77 ++optind; 78 place = EMSG; 79 return (-1); 80 } 81 } /* option letter okay? */ 82 if ((optopt = (int)*place++) == (int)':' || 83 !(oli = strchr(ostr, optopt))) { 84 /* 85 * if the user didn't specify '-' as an option, 86 * assume it means -1. 87 */ 88 if (optopt == (int)'-') 89 return (-1); 90 if (!*place) 91 ++optind; 92 if (opterr && *ostr != ':') 93 (void)fprintf(stderr, 94 "%s: illegal option -- %c\n", __progname, optopt); 95 return (BADCH); 96 } 97 if (*++oli != ':') { /* don't need argument */ 98 optarg = NULL; 99 if (!*place) 100 ++optind; 101 } 102 else { /* need an argument */ 103 if (*place) /* no white space */ 104 optarg = place; 105 else if (nargc <= ++optind) { /* no arg */ 106 place = EMSG; 107 if (*ostr == ':') 108 return (BADARG); 109 if (opterr) 110 (void)fprintf(stderr, 111 "%s: option requires an argument -- %c\n", 112 __progname, optopt); 113 return (BADCH); 114 } 115 else /* white space */ 116 optarg = nargv[optind]; 117 place = EMSG; 118 ++optind; 119 } 120 return (optopt); /* dump back option letter */ 121 } 122