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-/* $Id: getopt.c 4022 2008-03-31 06:11:07Z rra $
- *
- * Replacement implementation of getopt.
- *
- * This is a replacement implementation for getopt based on the my_getopt
- * distribution by Benjamin Sittler. Only the getopt interface is included,
- * since remctl doesn't use GNU long options, and the code has been rearranged
- * and reworked somewhat to fit with the remctl coding style.
- *
- * Copyright 1997, 2000, 2001, 2002 Benjamin Sittler
- * Copyright 2008 Russ Allbery <rra@stanford.edu>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- */
-
-#include <config.h>
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-/*
- * If we're running the test suite, rename getopt and the global variables to
- * avoid conflicts with the system version.
- */
-#if TESTING
-# define getopt test_getopt
-int test_getopt(int, char **, const char *);
-# define optind test_optind
-# define opterr test_opterr
-# define optopt test_optopt
-# define optarg test_optarg
-#endif
-
-/* Initialize global interface variables. */
-int optind = 1;
-int opterr = 1;
-int optopt = 0;
-char *optarg = NULL;
-
-/*
- * This is the plain old UNIX getopt, with GNU-style extensions. If you're
- * porting some piece of UNIX software, this is all you need. It supports
- * GNU-style permutation and optional arguments, but does not support the GNU
- * -W extension.
- *
- * This function is not re-entrant or thread-safe, has static variables, and
- * generally isn't a great interface, but normally you only call it once.
- */
-int
-getopt(int argc, char *argv[], const char *optstring)
-{
- const char *p;
- size_t offset = 0;
- char mode = '\0';
- int colon_mode = 0;
- int option = -1;
-
- /* Holds the current position in the parameter being parsed. */
- static int charind = 0;
-
- /*
- * By default, getopt permutes argv as it scans and leaves all non-options
- * at the end. This can be changed with the first character of optstring
- * or the environment variable POSIXLY_CORRECT. With a first character of
- * '+' or when POSIXLY_CORRECT is set, option processing stops at the
- * first non-option. If the first character is '-', each non-option argv
- * element is handled as if it were the argument of an option with
- * character code 1. mode holds this character.
- *
- * After the optional leading '+' and '-', optstring may contain ':'. If
- * present, missing arguments return ':' instead of '?'. colon_mode holds
- * this setting.
- */
- if (getenv("POSIXLY_CORRECT") != NULL) {
- mode = '+';
- colon_mode = '+';
- } else {
- if (optstring[offset] == '+' || optstring[offset] == '-') {
- mode = optstring[offset];
- offset++;
- }
- if (optstring[offset] == ':') {
- colon_mode = 1;
- offset++;
- }
- }
-
- /*
- * charind holds where we left off. If it's set, we were in the middle
- * of an argv element; if not, we pick up with the next element of
- * optind.
- */
- optarg = NULL;
- if (charind == 0) {
- if (optind >= argc)
- option = -1;
- else if (strcmp(argv[optind], "--") == 0) {
- optind++;
- option = -1;
- } else if (argv[optind][0] != '-' || argv[optind][1] == '\0') {
- char *tmp;
- int i, j, k, end;
-
- if (mode == '+')
- option = -1;
- else if (mode == '-') {
- optarg = argv[optind];
- optind++;
- option = 1;
- } else {
- for (i = optind + 1, j = optind; i < argc; i++)
- if ((argv[i][0] == '-') && (argv[i][1] != '\0')) {
- optind = i;
- option = getopt(argc, argv, optstring);
- while (i > j) {
- --i;
- tmp = argv[i];
- end = (charind == 0) ? optind - 1 : optind;
- for (k = i; k + 1 <= end; k++) {
- argv[k] = argv[k + 1];
- }
- argv[end] = tmp;
- --optind;
- }
- break;
- }
- if (i == argc)
- option = -1;
- }
- return option;
- } else {
- charind = 1;
- }
- }
- if (charind != 0) {
- optopt = argv[optind][charind];
- for (p = optstring + offset; *p != '\0'; p++)
- if (optopt == *p) {
- p++;
- if (*p == ':') {
- if (argv[optind][charind + 1] != '\0') {
- optarg = &argv[optind][charind + 1];
- optind++;
- charind = 0;
- } else {
- p++;
- if (*p != ':') {
- charind = 0;
- optind++;
- if (optind >= argc) {
- if (opterr)
- fprintf(stderr, "%s: option requires"
- " an argument -- %c\n", argv[0],
- optopt);
- option = colon_mode ? ':' : '?';
- goto done;
- } else {
- optarg = argv[optind];
- optind++;
- }
- }
- }
- }
- option = optopt;
- }
- if (option == -1) {
- if (opterr)
- fprintf(stderr, "%s: illegal option -- %c\n", argv[0], optopt);
- option = '?';
- }
- }
-
-done:
- if (charind != 0) {
- charind++;
- if (argv[optind][charind] == '\0') {
- optind++;
- charind = 0;
- }
- }
- if (optind > argc)
- optind = argc;
- return option;
-}