| Thomas Klausner | 81e9433 | 2011-03-08 14:10:27 +0100 | [diff] [blame] | 1 | /* |
| 2 | * getopt.c -- |
| 3 | * |
| 4 | * Standard UNIX getopt function. Code is from BSD. |
| 5 | * |
| 6 | * Copyright (c) 1987-2002 The Regents of the University of California. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions are met: |
| 11 | * |
| 12 | * A. Redistributions of source code must retain the above copyright notice, |
| 13 | * this list of conditions and the following disclaimer. |
| 14 | * B. Redistributions in binary form must reproduce the above copyright notice, |
| 15 | * this list of conditions and the following disclaimer in the documentation |
| 16 | * and/or other materials provided with the distribution. |
| 17 | * C. Neither the names of the copyright holders nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived from this |
| 19 | * software without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS |
| 22 | * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 23 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 24 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE |
| 25 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 30 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 31 | * POSSIBILITY OF SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | /* #if !defined(lint) |
| 35 | * static char sccsid[] = "@(#)getopt.c 8.2 (Berkeley) 4/2/94"; |
| 36 | * #endif |
| 37 | */ |
| 38 | #include <stdio.h> |
| 39 | #include <stdlib.h> |
| 40 | #include <string.h> |
| 41 | |
| 42 | #include "getopt.h" |
| 43 | |
| 44 | int opterr = 1, /* if error message should be printed */ |
| 45 | optind = 1, /* index into parent argv vector */ |
| 46 | optopt, /* character checked for validity */ |
| 47 | optreset; /* reset getopt */ |
| 48 | char *optarg; /* argument associated with option */ |
| 49 | |
| 50 | #define BADCH (int)'?' |
| 51 | #define BADARG (int)':' |
| 52 | #define EMSG "" |
| 53 | |
| 54 | /* |
| 55 | * getopt -- |
| 56 | * Parse argc/argv argument vector. |
| 57 | */ |
| 58 | int |
| 59 | getopt( int nargc, |
| 60 | char * const *nargv, |
| 61 | const char *ostr) |
| 62 | { |
| 63 | static char *place = EMSG; /* option letter processing */ |
| 64 | char *oli; /* option letter list index */ |
| 65 | |
| 66 | if (optreset || !*place) { /* update scanning pointer */ |
| 67 | optreset = 0; |
| 68 | if (optind >= nargc || *(place = nargv[optind]) != '-') { |
| 69 | place = EMSG; |
| 70 | return (EOF); |
| 71 | } |
| 72 | if (place[1] && *++place == '-') { /* found "--" */ |
| 73 | ++optind; |
| 74 | place = EMSG; |
| 75 | return (EOF); |
| 76 | } |
| 77 | } /* option letter okay? */ |
| 78 | if ((optopt = (int)*place++) == (int)':' || |
| 79 | !(oli = (char*) strchr(ostr, optopt))) { |
| 80 | /* |
| 81 | * if the user didn't specify '-' as an option, |
| 82 | * assume it means EOF. |
| 83 | */ |
| 84 | if (optopt == (int)'-') |
| 85 | return (EOF); |
| 86 | if (!*place) |
| 87 | ++optind; |
| 88 | if (opterr && *ostr != ':') |
| 89 | (void)fprintf(stderr, |
| 90 | "illegal option -- %c\n", optopt); |
| 91 | return (BADCH); |
| 92 | } |
| 93 | if (*++oli != ':') { /* don't need argument */ |
| 94 | optarg = NULL; |
| 95 | if (!*place) |
| 96 | ++optind; |
| 97 | } |
| 98 | else { /* need an argument */ |
| 99 | if (*place) /* no white space */ |
| 100 | optarg = place; |
| 101 | else if (nargc <= ++optind) { /* no arg */ |
| 102 | place = EMSG; |
| 103 | if (*ostr == ':') |
| 104 | return (BADARG); |
| 105 | if (opterr) |
| 106 | (void)fprintf(stderr, |
| 107 | "option requires an argument -- %c\n", |
| 108 | optopt); |
| 109 | return (BADCH); |
| 110 | } |
| 111 | else /* white space */ |
| 112 | optarg = nargv[optind]; |
| 113 | place = EMSG; |
| 114 | ++optind; |
| 115 | } |
| 116 | return (optopt); /* dump back option letter */ |
| 117 | } |
