xref: /dragonfly/usr.bin/pr/egetopt.c (revision dc71b7ab)
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. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * @(#)egetopt.c	8.1 (Berkeley) 6/6/93
34  *
35  * $DragonFly: src/usr.bin/pr/egetopt.c,v 1.4 2008/10/16 01:52:32 swildner Exp $
36  */
37 
38 #include <ctype.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 
43 #include "extern.h"
44 
45 /*
46  * egetopt:	get option letter from argument vector (an extended
47  *		version of getopt).
48  *
49  * Non standard additions to the ostr specs are:
50  * 1) '?': immediate value following arg is optional (no white space
51  *    between the arg and the value)
52  * 2) '#': +/- followed by a number (with an optional sign but
53  *    no white space between the arg and the number). The - may be
54  *    combined with other options, but the + cannot.
55  */
56 
57 int	eopterr = 1;		/* if error message should be printed */
58 int	eoptind = 1;		/* index into parent argv vector */
59 int	eoptopt;		/* character checked for validity */
60 char	*eoptarg;		/* argument associated with option */
61 
62 #define	BADCH	(int)'?'
63 #define	EMSG	""
64 
65 int
egetopt(int nargc,char * const * nargv,const char * ostr)66 egetopt(int nargc, char * const *nargv, const char *ostr)
67 {
68 	static char *place = EMSG;	/* option letter processing */
69 	char *oli;			/* option letter list index */
70 	static int delim;		/* which option delimeter */
71 	char *p;
72 	static char savec = '\0';
73 
74 	if (savec != '\0') {
75 		*place = savec;
76 		savec = '\0';
77 	}
78 
79 	if (!*place) {
80 		/*
81 		 * update scanning pointer
82 		 */
83 		if ((eoptind >= nargc) ||
84 		    ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
85 			place = EMSG;
86 			return (EOF);
87 		}
88 
89 		delim = (int)*place;
90 		if (place[1] && *++place == '-' && !place[1]) {
91 			/*
92 			 * found "--"
93 			 */
94 			++eoptind;
95 			place = EMSG;
96 			return (EOF);
97 		}
98 	}
99 
100 	/*
101 	 * check option letter
102 	 */
103 	if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
104 	    !(oli = strchr(ostr, eoptopt))) {
105 		/*
106 		 * if the user didn't specify '-' as an option,
107 		 * assume it means EOF when by itself.
108 		 */
109 		if ((eoptopt == (int)'-') && !*place)
110 			return (EOF);
111 		if (strchr(ostr, '#') && (isdigit(eoptopt) ||
112 		    (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
113 		      isdigit(*place)))) {
114 			/*
115 			 * # option: +/- with a number is ok
116 			 */
117 			for (p = place; *p != '\0'; ++p) {
118 				if (!isdigit(*p))
119 					break;
120 			}
121 			eoptarg = place-1;
122 
123 			if (*p == '\0') {
124 				place = EMSG;
125 				++eoptind;
126 			} else {
127 				place = p;
128 				savec = *p;
129 				*place = '\0';
130 			}
131 			return (delim);
132 		}
133 
134 		if (!*place)
135 			++eoptind;
136 		if (eopterr) {
137 			if (!(p = strrchr(*nargv, '/')))
138 				p = *nargv;
139 			else
140 				++p;
141 			(void)fprintf(stderr, "%s: illegal option -- %c\n",
142 			    p, eoptopt);
143 		}
144 		return (BADCH);
145 	}
146 	if (delim == (int)'+') {
147 		/*
148 		 * '+' is only allowed with numbers
149 		 */
150 		if (!*place)
151 			++eoptind;
152 		if (eopterr) {
153 			if (!(p = strrchr(*nargv, '/')))
154 				p = *nargv;
155 			else
156 				++p;
157 			(void)fprintf(stderr,
158 				"%s: illegal '+' delimiter with option -- %c\n",
159 				p, eoptopt);
160 		}
161 		return (BADCH);
162 	}
163 	++oli;
164 	if ((*oli != ':') && (*oli != '?')) {
165 		/*
166 		 * don't need argument
167 		 */
168 		eoptarg = NULL;
169 		if (!*place)
170 			++eoptind;
171 		return (eoptopt);
172 	}
173 
174 	if (*place) {
175 		/*
176 		 * no white space
177 		 */
178 		eoptarg = place;
179 	} else if (*oli == '?') {
180 		/*
181 		 * no arg, but NOT required
182 		 */
183 		eoptarg = NULL;
184 	} else if (nargc <= ++eoptind) {
185 		/*
186 		 * no arg, but IS required
187 		 */
188 		place = EMSG;
189 		if (eopterr) {
190 			if (!(p = strrchr(*nargv, '/')))
191 				p = *nargv;
192 			else
193 				++p;
194 			(void)fprintf(stderr,
195 			    "%s: option requires an argument -- %c\n", p,
196 			    eoptopt);
197 		}
198 		return (BADCH);
199 	} else {
200 		/*
201 		 * arg has white space
202 		 */
203 		eoptarg = nargv[eoptind];
204 	}
205 	place = EMSG;
206 	++eoptind;
207 	return (eoptopt);
208 }
209