2 * Copyright (c) 1991 Keith Muller.
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
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10 * modification, are permitted provided that the following conditions
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13 * notice, this list of conditions and the following disclaimer.
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15 * notice, this list of conditions and the following disclaimer in the
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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.
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37 * @(#)egetopt.c 8.1 (Berkeley) 6/6/93
48 * egetopt: get option letter from argument vector (an extended
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.
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 */
64 #define BADCH (int)'?'
68 egetopt(nargc, nargv, ostr)
73 static char *place = EMSG; /* option letter processing */
74 register char *oli; /* option letter list index */
75 static int delim; /* which option delimeter */
77 static char savec = '\0';
86 * update scanning pointer
88 if ((eoptind >= nargc) ||
89 ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
95 if (place[1] && *++place == '-' && !place[1]) {
106 * check option letter
108 if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
109 !(oli = strchr(ostr, eoptopt))) {
111 * if the user didn't specify '-' as an option,
112 * assume it means EOF when by itself.
114 if ((eoptopt == (int)'-') && !*place)
116 if (strchr(ostr, '#') && (isdigit(eoptopt) ||
117 (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
120 * # option: +/- with a number is ok
122 for (p = place; *p != '\0'; ++p) {
142 if (!(p = strrchr(*nargv, '/')))
146 (void)fprintf(stderr, "%s: illegal option -- %c\n",
151 if (delim == (int)'+') {
153 * '+' is only allowed with numbers
158 if (!(p = strrchr(*nargv, '/')))
162 (void)fprintf(stderr,
163 "%s: illegal '+' delimiter with option -- %c\n",
169 if ((*oli != ':') && (*oli != '?')) {
171 * don't need argument
184 } else if (*oli == '?') {
186 * no arg, but NOT required
189 } else if (nargc <= ++eoptind) {
191 * no arg, but IS required
195 if (!(p = strrchr(*nargv, '/')))
199 (void)fprintf(stderr,
200 "%s: option requires an argument -- %c\n", p,
206 * arg has white space
208 eoptarg = nargv[eoptind];