root / prex-0.9.0 / usr / lib / libc / stdlib / getopt.c @ 03e9c04a
History | View | Annotate | Download (3.45 KB)
| 1 | 03e9c04a | Brad Neuman | /*
|
|---|---|---|---|
| 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 <unistd.h> |
||
| 31 | #include <stdio.h> |
||
| 32 | #include <stdlib.h> |
||
| 33 | #include <string.h> |
||
| 34 | |||
| 35 | int opterr = 1, /* if error message should be printed */ |
||
| 36 | optind = 1, /* index into parent argv vector */ |
||
| 37 | optopt, /* character checked for validity */
|
||
| 38 | optreset; /* reset getopt */
|
||
| 39 | char *optarg; /* argument associated with option */ |
||
| 40 | |||
| 41 | #define BADCH (int)'?' |
||
| 42 | #define BADARG (int)':' |
||
| 43 | #define EMSG "" |
||
| 44 | |||
| 45 | /*
|
||
| 46 | * getopt --
|
||
| 47 | * Parse argc/argv argument vector.
|
||
| 48 | */
|
||
| 49 | int
|
||
| 50 | getopt(int nargc, char * const nargv[], const char *ostr) |
||
| 51 | {
|
||
| 52 | #if 0
|
||
| 53 | extern char *__progname;
|
||
| 54 | #endif
|
||
| 55 | static char *place = EMSG; /* option letter processing */ |
||
| 56 | char *oli; /* option letter list index */ |
||
| 57 | |||
| 58 | if (optreset || !*place) { /* update scanning pointer */ |
||
| 59 | optreset = 0;
|
||
| 60 | if (optind >= nargc || *(place = nargv[optind]) != '-') { |
||
| 61 | place = EMSG; |
||
| 62 | return (-1); |
||
| 63 | } |
||
| 64 | if (place[1] && *++place == '-') { /* found "--" */ |
||
| 65 | ++optind; |
||
| 66 | place = EMSG; |
||
| 67 | return (-1); |
||
| 68 | } |
||
| 69 | } /* option letter okay? */
|
||
| 70 | if ((optopt = (int)*place++) == (int)':' || |
||
| 71 | !(oli = strchr(ostr, optopt))) {
|
||
| 72 | /*
|
||
| 73 | * if the user didn't specify '-' as an option,
|
||
| 74 | * assume it means -1.
|
||
| 75 | */
|
||
| 76 | if (optopt == (int)'-') |
||
| 77 | return (-1); |
||
| 78 | if (!*place)
|
||
| 79 | ++optind; |
||
| 80 | #if 0
|
||
| 81 | if (opterr && *ostr != ':')
|
||
| 82 | (void)fprintf(stderr,
|
||
| 83 | "%s: illegal option -- %c\n", __progname, optopt);
|
||
| 84 | #endif
|
||
| 85 | return (BADCH);
|
||
| 86 | } |
||
| 87 | if (*++oli != ':') { /* don't need argument */ |
||
| 88 | optarg = NULL;
|
||
| 89 | if (!*place)
|
||
| 90 | ++optind; |
||
| 91 | } |
||
| 92 | else { /* need an argument */ |
||
| 93 | if (*place) /* no white space */ |
||
| 94 | optarg = place; |
||
| 95 | else if (nargc <= ++optind) { /* no arg */ |
||
| 96 | place = EMSG; |
||
| 97 | if (*ostr == ':') |
||
| 98 | return (BADARG);
|
||
| 99 | #if 0
|
||
| 100 | if (opterr)
|
||
| 101 | (void)fprintf(stderr,
|
||
| 102 | "%s: option requires an argument -- %c\n",
|
||
| 103 | __progname, optopt);
|
||
| 104 | #endif
|
||
| 105 | return (BADCH);
|
||
| 106 | } |
||
| 107 | else /* white space */ |
||
| 108 | optarg = nargv[optind]; |
||
| 109 | place = EMSG; |
||
| 110 | ++optind; |
||
| 111 | } |
||
| 112 | return (optopt); /* dump back option letter */ |
||
| 113 | } |