1 /*- 2 * Copyright (c) 1991 Keith Muller. 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Keith Muller of the University of California, San Diego. 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 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)egetopt.c 8.1 (Berkeley) 6/6/93 38 */ 39 40 #include <ctype.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "extern.h" 46 47 /* 48 * egetopt: get option letter from argument vector (an extended 49 * version of getopt). 50 * 51 * Non standard additions to the ostr specs are: 52 * 1) '?': immediate value following arg is optional (no white space 53 * between the arg and the value) 54 * 2) '#': +/- followed by a number (with an optional sign but 55 * no white space between the arg and the number). The - may be 56 * combined with other options, but the + cannot. 57 */ 58 59 int eopterr = 1; /* if error message should be printed */ 60 int eoptind = 1; /* index into parent argv vector */ 61 int eoptopt; /* character checked for validity */ 62 char *eoptarg; /* argument associated with option */ 63 64 #define BADCH (int)'?' 65 #define EMSG "" 66 67 int 68 egetopt(nargc, nargv, ostr) 69 int nargc; 70 char * const *nargv; 71 const char *ostr; 72 { 73 static char *place = EMSG; /* option letter processing */ 74 register char *oli; /* option letter list index */ 75 static int delim; /* which option delimeter */ 76 register char *p; 77 static char savec = '\0'; 78 79 if (savec != '\0') { 80 *place = savec; 81 savec = '\0'; 82 } 83 84 if (!*place) { 85 /* 86 * update scanning pointer 87 */ 88 if ((eoptind >= nargc) || 89 ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) { 90 place = EMSG; 91 return (EOF); 92 } 93 94 delim = (int)*place; 95 if (place[1] && *++place == '-' && !place[1]) { 96 /* 97 * found "--" 98 */ 99 ++eoptind; 100 place = EMSG; 101 return (EOF); 102 } 103 } 104 105 /* 106 * check option letter 107 */ 108 if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') || 109 !(oli = strchr(ostr, eoptopt))) { 110 /* 111 * if the user didn't specify '-' as an option, 112 * assume it means EOF when by itself. 113 */ 114 if ((eoptopt == (int)'-') && !*place) 115 return (EOF); 116 if (strchr(ostr, '#') && (isdigit(eoptopt) || 117 (((eoptopt == (int)'-') || (eoptopt == (int)'+')) && 118 isdigit(*place)))) { 119 /* 120 * # option: +/- with a number is ok 121 */ 122 for (p = place; *p != '\0'; ++p) { 123 if (!isdigit(*p)) 124 break; 125 } 126 eoptarg = place-1; 127 128 if (*p == '\0') { 129 place = EMSG; 130 ++eoptind; 131 } else { 132 place = p; 133 savec = *p; 134 *place = '\0'; 135 } 136 return (delim); 137 } 138 139 if (!*place) 140 ++eoptind; 141 if (eopterr) { 142 if (!(p = strrchr(*nargv, '/'))) 143 p = *nargv; 144 else 145 ++p; 146 (void)fprintf(stderr, "%s: illegal option -- %c\n", 147 p, eoptopt); 148 } 149 return (BADCH); 150 } 151 if (delim == (int)'+') { 152 /* 153 * '+' is only allowed with numbers 154 */ 155 if (!*place) 156 ++eoptind; 157 if (eopterr) { 158 if (!(p = strrchr(*nargv, '/'))) 159 p = *nargv; 160 else 161 ++p; 162 (void)fprintf(stderr, 163 "%s: illegal '+' delimiter with option -- %c\n", 164 p, eoptopt); 165 } 166 return (BADCH); 167 } 168 ++oli; 169 if ((*oli != ':') && (*oli != '?')) { 170 /* 171 * don't need argument 172 */ 173 eoptarg = NULL; 174 if (!*place) 175 ++eoptind; 176 return (eoptopt); 177 } 178 179 if (*place) { 180 /* 181 * no white space 182 */ 183 eoptarg = place; 184 } else if (*oli == '?') { 185 /* 186 * no arg, but NOT required 187 */ 188 eoptarg = NULL; 189 } else if (nargc <= ++eoptind) { 190 /* 191 * no arg, but IS required 192 */ 193 place = EMSG; 194 if (eopterr) { 195 if (!(p = strrchr(*nargv, '/'))) 196 p = *nargv; 197 else 198 ++p; 199 (void)fprintf(stderr, 200 "%s: option requires an argument -- %c\n", p, 201 eoptopt); 202 } 203 return (BADCH); 204 } else { 205 /* 206 * arg has white space 207 */ 208 eoptarg = nargv[eoptind]; 209 } 210 place = EMSG; 211 ++eoptind; 212 return (eoptopt); 213 } 214