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1.8 ! deraadt 1: /* $OpenBSD: egetopt.c,v 1.7 2003/11/09 20:13:57 otto Exp $ */
1.2 deraadt 2:
1.1 deraadt 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.
1.5 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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: #include <ctype.h>
37: #include <stdio.h>
38: #include <stdlib.h>
39: #include <string.h>
40:
41: #include "extern.h"
42:
43: /*
44: * egetopt: get option letter from argument vector (an extended
45: * version of getopt).
46: *
47: * Non standard additions to the ostr specs are:
48: * 1) '?': immediate value following arg is optional (no white space
49: * between the arg and the value)
50: * 2) '#': +/- followed by a number (with an optional sign but
51: * no white space between the arg and the number). The - may be
52: * combined with other options, but the + cannot.
53: */
54:
55: int eopterr = 1; /* if error message should be printed */
56: int eoptind = 1; /* index into parent argv vector */
57: int eoptopt; /* character checked for validity */
58: char *eoptarg; /* argument associated with option */
59:
60: #define BADCH (int)'?'
61: #define EMSG ""
62:
63: int
1.6 deraadt 64: egetopt(int nargc, char * const *nargv, const char *ostr)
1.1 deraadt 65: {
66: static char *place = EMSG; /* option letter processing */
1.4 mpech 67: char *oli; /* option letter list index */
1.7 otto 68: static int delim; /* which option delimiter */
1.4 mpech 69: char *p;
1.1 deraadt 70: static char savec = '\0';
71:
72: if (savec != '\0') {
73: *place = savec;
74: savec = '\0';
75: }
76:
77: if (!*place) {
78: /*
79: * update scanning pointer
80: */
81: if ((eoptind >= nargc) ||
82: ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
83: place = EMSG;
1.3 millert 84: return (-1);
1.1 deraadt 85: }
86:
87: delim = (int)*place;
88: if (place[1] && *++place == '-' && !place[1]) {
89: /*
90: * found "--"
91: */
92: ++eoptind;
93: place = EMSG;
1.3 millert 94: return (-1);
1.1 deraadt 95: }
96: }
97:
98: /*
99: * check option letter
100: */
101: if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
102: !(oli = strchr(ostr, eoptopt))) {
103: /*
104: * if the user didn't specify '-' as an option,
105: * assume it means EOF when by itself.
106: */
107: if ((eoptopt == (int)'-') && !*place)
1.3 millert 108: return (-1);
1.1 deraadt 109: if (strchr(ostr, '#') && (isdigit(eoptopt) ||
110: (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
111: isdigit(*place)))) {
112: /*
113: * # option: +/- with a number is ok
114: */
115: for (p = place; *p != '\0'; ++p) {
116: if (!isdigit(*p))
117: break;
118: }
119: eoptarg = place-1;
120:
121: if (*p == '\0') {
122: place = EMSG;
123: ++eoptind;
124: } else {
125: place = p;
126: savec = *p;
127: *place = '\0';
128: }
129: return (delim);
130: }
131:
132: if (!*place)
133: ++eoptind;
134: if (eopterr) {
135: if (!(p = strrchr(*nargv, '/')))
136: p = *nargv;
137: else
138: ++p;
139: (void)fprintf(stderr, "%s: illegal option -- %c\n",
140: p, eoptopt);
141: }
142: return (BADCH);
143: }
144: if (delim == (int)'+') {
145: /*
146: * '+' is only allowed with numbers
147: */
148: if (!*place)
149: ++eoptind;
150: if (eopterr) {
151: if (!(p = strrchr(*nargv, '/')))
152: p = *nargv;
153: else
154: ++p;
155: (void)fprintf(stderr,
156: "%s: illegal '+' delimiter with option -- %c\n",
157: p, eoptopt);
158: }
159: return (BADCH);
160: }
161: ++oli;
162: if ((*oli != ':') && (*oli != '?')) {
163: /*
164: * don't need argument
165: */
166: eoptarg = NULL;
167: if (!*place)
168: ++eoptind;
169: return (eoptopt);
170: }
171:
172: if (*place) {
173: /*
174: * no white space
175: */
176: eoptarg = place;
177: } else if (*oli == '?') {
178: /*
179: * no arg, but NOT required
180: */
181: eoptarg = NULL;
182: } else if (nargc <= ++eoptind) {
183: /*
184: * no arg, but IS required
185: */
186: place = EMSG;
187: if (eopterr) {
188: if (!(p = strrchr(*nargv, '/')))
189: p = *nargv;
190: else
191: ++p;
192: (void)fprintf(stderr,
193: "%s: option requires an argument -- %c\n", p,
194: eoptopt);
195: }
196: return (BADCH);
197: } else {
198: /*
199: * arg has white space
200: */
201: eoptarg = nargv[eoptind];
202: }
203: place = EMSG;
204: ++eoptind;
205: return (eoptopt);
206: }