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4dc8ca2 @yangtse Add file ares_getopt.c
yangtse authored
1 /*
2 * Original file name getopt.c Initial import into the c-ares source tree
3 * on 2007-04-11. Lifted from version 5.2 of the 'Open Mash' project with
4 * the modified BSD license, BSD license without the advertising clause.
5 *
6 * $Id$
7 */
8
9 /*
10 * getopt.c --
11 *
12 * Standard UNIX getopt function. Code is from BSD.
13 *
14 * Copyright (c) 1987-2001 The Regents of the University of California.
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are met:
19 *
20 * A. Redistributions of source code must retain the above copyright notice,
21 * this list of conditions and the following disclaimer.
22 * B. Redistributions in binary form must reproduce the above copyright notice,
23 * this list of conditions and the following disclaimer in the documentation
24 * and/or other materials provided with the distribution.
25 * C. Neither the names of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from this
27 * software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
30 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
31 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
32 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
33 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
34 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
35 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
36 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
37 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
39 * POSSIBILITY OF SUCH DAMAGE.
40 */
41
42 /* #if !defined(lint)
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43 * static char sccsid[] = "@(#)getopt.c 8.2 (Berkeley) 4/2/94";
4dc8ca2 @yangtse Add file ares_getopt.c
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44 * #endif
45 */
46
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
bba777d @yangtse ares_getopt() command-line parser function does not belong to actual
yangtse authored
50 #include "ares_getopt.h"
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51
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52 int opterr = 1, /* if error message should be printed */
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53 optind = 1; /* index into parent argv vector */
c1f1415 @yangtse Fix name space pollution.
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54 int optopt = 0; /* character checked for validity */
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55 static int optreset; /* reset getopt */
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56 char *optarg; /* argument associated with option */
4dc8ca2 @yangtse Add file ares_getopt.c
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57
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58 #define BADCH (int)'?'
59 #define BADARG (int)':'
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60 #define EMSG (char *)""
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61
62 /*
8776d15 @yangtse Rename function as ares_getopt()
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63 * ares_getopt --
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64 * Parse argc/argv argument vector.
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65 */
66 int
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67 ares_getopt(int nargc, char * const nargv[], const char *ostr)
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68 {
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69 static char *place = EMSG; /* option letter processing */
70 char *oli; /* option letter list index */
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71
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72 if (optreset || !*place) { /* update scanning pointer */
73 optreset = 0;
74 if (optind >= nargc || *(place = nargv[optind]) != '-') {
75 place = EMSG;
76 return (EOF);
77 }
78 if (place[1] && *++place == '-') { /* found "--" */
79 ++optind;
80 place = EMSG;
81 return (EOF);
82 }
83 } /* option letter okay? */
84 if ((optopt = (int)*place++) == (int)':' ||
43a7127 @yangtse fix compiler warning: assignment within conditional expression
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85 (oli = strchr(ostr, optopt)) == NULL) {
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86 /*
87 * if the user didn't specify '-' as an option,
88 * assume it means EOF.
89 */
90 if (optopt == (int)'-')
91 return (EOF);
92 if (!*place)
93 ++optind;
94 if (opterr && *ostr != ':')
95 (void)fprintf(stderr,
96 "%s: illegal option -- %c\n", __FILE__, optopt);
97 return (BADCH);
98 }
99 if (*++oli != ':') { /* don't need argument */
100 optarg = NULL;
101 if (!*place)
102 ++optind;
103 }
104 else { /* need an argument */
105 if (*place) /* no white space */
106 optarg = place;
107 else if (nargc <= ++optind) { /* no arg */
108 place = EMSG;
109 if (*ostr == ':')
110 return (BADARG);
111 if (opterr)
112 (void)fprintf(stderr,
113 "%s: option requires an argument -- %c\n",
114 __FILE__, optopt);
115 return (BADCH);
116 }
117 else /* white space */
118 optarg = nargv[optind];
119 place = EMSG;
120 ++optind;
121 }
122 return (optopt); /* dump back option letter */
4dc8ca2 @yangtse Add file ares_getopt.c
yangtse authored
123 }
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