1 /* $OpenBSD: egetopt.c,v 1.7 2003/11/09 20:13:57 otto Exp $ */ 2 3 /*- 4 * Copyright (c) 1991 Keith Muller. 5 * Copyright (c) 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Keith Muller of the University of California, San Diego. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 /* from: static char sccsid[] = "@(#)egetopt.c 8.1 (Berkeley) 6/6/93"; */ 38 static char *rcsid = "$OpenBSD: egetopt.c,v 1.7 2003/11/09 20:13:57 otto Exp $"; 39 #endif /* not lint */ 40 41 #include <ctype.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "extern.h" 47 48 /* 49 * egetopt: get option letter from argument vector (an extended 50 * version of getopt). 51 * 52 * Non standard additions to the ostr specs are: 53 * 1) '?': immediate value following arg is optional (no white space 54 * between the arg and the value) 55 * 2) '#': +/- followed by a number (with an optional sign but 56 * no white space between the arg and the number). The - may be 57 * combined with other options, but the + cannot. 58 */ 59 60 int eopterr = 1; /* if error message should be printed */ 61 int eoptind = 1; /* index into parent argv vector */ 62 int eoptopt; /* character checked for validity */ 63 char *eoptarg; /* argument associated with option */ 64 65 #define BADCH (int)'?' 66 #define EMSG "" 67 68 int 69 egetopt(int nargc, char * const *nargv, const char *ostr) 70 { 71 static char *place = EMSG; /* option letter processing */ 72 char *oli; /* option letter list index */ 73 static int delim; /* which option delimiter */ 74 char *p; 75 static char savec = '\0'; 76 77 if (savec != '\0') { 78 *place = savec; 79 savec = '\0'; 80 } 81 82 if (!*place) { 83 /* 84 * update scanning pointer 85 */ 86 if ((eoptind >= nargc) || 87 ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) { 88 place = EMSG; 89 return (-1); 90 } 91 92 delim = (int)*place; 93 if (place[1] && *++place == '-' && !place[1]) { 94 /* 95 * found "--" 96 */ 97 ++eoptind; 98 place = EMSG; 99 return (-1); 100 } 101 } 102 103 /* 104 * check option letter 105 */ 106 if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') || 107 !(oli = strchr(ostr, eoptopt))) { 108 /* 109 * if the user didn't specify '-' as an option, 110 * assume it means EOF when by itself. 111 */ 112 if ((eoptopt == (int)'-') && !*place) 113 return (-1); 114 if (strchr(ostr, '#') && (isdigit(eoptopt) || 115 (((eoptopt == (int)'-') || (eoptopt == (int)'+')) && 116 isdigit(*place)))) { 117 /* 118 * # option: +/- with a number is ok 119 */ 120 for (p = place; *p != '\0'; ++p) { 121 if (!isdigit(*p)) 122 break; 123 } 124 eoptarg = place-1; 125 126 if (*p == '\0') { 127 place = EMSG; 128 ++eoptind; 129 } else { 130 place = p; 131 savec = *p; 132 *place = '\0'; 133 } 134 return (delim); 135 } 136 137 if (!*place) 138 ++eoptind; 139 if (eopterr) { 140 if (!(p = strrchr(*nargv, '/'))) 141 p = *nargv; 142 else 143 ++p; 144 (void)fprintf(stderr, "%s: illegal option -- %c\n", 145 p, eoptopt); 146 } 147 return (BADCH); 148 } 149 if (delim == (int)'+') { 150 /* 151 * '+' is only allowed with numbers 152 */ 153 if (!*place) 154 ++eoptind; 155 if (eopterr) { 156 if (!(p = strrchr(*nargv, '/'))) 157 p = *nargv; 158 else 159 ++p; 160 (void)fprintf(stderr, 161 "%s: illegal '+' delimiter with option -- %c\n", 162 p, eoptopt); 163 } 164 return (BADCH); 165 } 166 ++oli; 167 if ((*oli != ':') && (*oli != '?')) { 168 /* 169 * don't need argument 170 */ 171 eoptarg = NULL; 172 if (!*place) 173 ++eoptind; 174 return (eoptopt); 175 } 176 177 if (*place) { 178 /* 179 * no white space 180 */ 181 eoptarg = place; 182 } else if (*oli == '?') { 183 /* 184 * no arg, but NOT required 185 */ 186 eoptarg = NULL; 187 } else if (nargc <= ++eoptind) { 188 /* 189 * no arg, but IS required 190 */ 191 place = EMSG; 192 if (eopterr) { 193 if (!(p = strrchr(*nargv, '/'))) 194 p = *nargv; 195 else 196 ++p; 197 (void)fprintf(stderr, 198 "%s: option requires an argument -- %c\n", p, 199 eoptopt); 200 } 201 return (BADCH); 202 } else { 203 /* 204 * arg has white space 205 */ 206 eoptarg = nargv[eoptind]; 207 } 208 place = EMSG; 209 ++eoptind; 210 return (eoptopt); 211 } 212