Annotation of prex-old/usr/lib/libc/stdlib/getopt.c, Revision 1.1.1.1
1.1 nbrk 1: /*
2: * Copyright (c) 1987, 1993, 1994
3: * The Regents of the University of California. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the University nor the names of its contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: #include <stdio.h>
31: #include <stdlib.h>
32: #include <string.h>
33:
34: int opterr = 1, /* if error message should be printed */
35: optind = 1, /* index into parent argv vector */
36: optopt, /* character checked for validity */
37: optreset; /* reset getopt */
38: char *optarg; /* argument associated with option */
39:
40: #define BADCH (int)'?'
41: #define BADARG (int)':'
42: #define EMSG ""
43:
44: /*
45: * getopt --
46: * Parse argc/argv argument vector.
47: */
48: int
49: getopt(int nargc, char * const nargv[], const char *ostr)
50: {
51: #if 0
52: extern char *__progname;
53: #endif
54: static char *place = EMSG; /* option letter processing */
55: char *oli; /* option letter list index */
56:
57: if (optreset || !*place) { /* update scanning pointer */
58: optreset = 0;
59: if (optind >= nargc || *(place = nargv[optind]) != '-') {
60: place = EMSG;
61: return (-1);
62: }
63: if (place[1] && *++place == '-') { /* found "--" */
64: ++optind;
65: place = EMSG;
66: return (-1);
67: }
68: } /* option letter okay? */
69: if ((optopt = (int)*place++) == (int)':' ||
70: !(oli = strchr(ostr, optopt))) {
71: /*
72: * if the user didn't specify '-' as an option,
73: * assume it means -1.
74: */
75: if (optopt == (int)'-')
76: return (-1);
77: if (!*place)
78: ++optind;
79: #if 0
80: if (opterr && *ostr != ':')
81: (void)fprintf(stderr,
82: "%s: illegal option -- %c\n", __progname, optopt);
83: #endif
84: return (BADCH);
85: }
86: if (*++oli != ':') { /* don't need argument */
87: optarg = NULL;
88: if (!*place)
89: ++optind;
90: }
91: else { /* need an argument */
92: if (*place) /* no white space */
93: optarg = place;
94: else if (nargc <= ++optind) { /* no arg */
95: place = EMSG;
96: if (*ostr == ':')
97: return (BADARG);
98: #if 0
99: if (opterr)
100: (void)fprintf(stderr,
101: "%s: option requires an argument -- %c\n",
102: __progname, optopt);
103: #endif
104: return (BADCH);
105: }
106: else /* white space */
107: optarg = nargv[optind];
108: place = EMSG;
109: ++optind;
110: }
111: return (optopt); /* dump back option letter */
112: }
CVSweb