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