--- /dev/null
+/* Copyright (c) 2012, Kim Gräsman
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Kim Gräsman nor the names of contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL KIM GRÄSMAN BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "getopt.h"
+
+#include <stddef.h>
+#include <string.h>
+
+const int no_argument = 0;
+const int required_argument = 1;
+const int optional_argument = 2;
+
+char* optarg;
+int optopt;
+/* The variable optind [...] shall be initialized to 1 by the system. */
+int optind = 1;
+int opterr;
+
+static char* optcursor = NULL;
+
+/* Implemented based on [1] and [2] for optional arguments.
+ optopt is handled FreeBSD-style, per [3].
+ Other GNU and FreeBSD extensions are purely accidental.
+
+[1] http://pubs.opengroup.org/onlinepubs/000095399/functions/getopt.html
+[2] http://www.kernel.org/doc/man-pages/online/pages/man3/getopt.3.html
+[3] http://www.freebsd.org/cgi/man.cgi?query=getopt&sektion=3&manpath=FreeBSD+9.0-RELEASE
+*/
+int getopt(int argc, char* const argv[], const char* optstring) {
+ int optchar = -1;
+ const char* optdecl = NULL;
+
+ optarg = NULL;
+ opterr = 0;
+ optopt = 0;
+
+ /* Unspecified, but we need it to avoid overrunning the argv bounds. */
+ if (optind >= argc)
+ goto no_more_optchars;
+
+ /* If, when getopt() is called argv[optind] is a null pointer, getopt()
+ shall return -1 without changing optind. */
+ if (argv[optind] == NULL)
+ goto no_more_optchars;
+
+ /* If, when getopt() is called *argv[optind] is not the character '-',
+ getopt() shall return -1 without changing optind. */
+ if (*argv[optind] != '-')
+ goto no_more_optchars;
+
+ /* If, when getopt() is called argv[optind] points to the string "-",
+ getopt() shall return -1 without changing optind. */
+ if (strcmp(argv[optind], "-") == 0)
+ goto no_more_optchars;
+
+ /* If, when getopt() is called argv[optind] points to the string "--",
+ getopt() shall return -1 after incrementing optind. */
+ if (strcmp(argv[optind], "--") == 0) {
+ ++optind;
+ goto no_more_optchars;
+ }
+
+ if (optcursor == NULL || *optcursor == '\0')
+ optcursor = argv[optind] + 1;
+
+ optchar = *optcursor;
+
+ /* FreeBSD: The variable optopt saves the last known option character
+ returned by getopt(). */
+ optopt = optchar;
+
+ /* The getopt() function shall return the next option character (if one is
+ found) from argv that matches a character in optstring, if there is
+ one that matches. */
+ optdecl = strchr(optstring, optchar);
+ if (optdecl) {
+ /* [I]f a character is followed by a colon, the option takes an
+ argument. */
+ if (optdecl[1] == ':') {
+ optarg = ++optcursor;
+ if (*optarg == '\0') {
+ /* GNU extension: Two colons mean an option takes an
+ optional arg; if there is text in the current argv-element
+ (i.e., in the same word as the option name itself, for example,
+ "-oarg"), then it is returned in optarg, otherwise optarg is set
+ to zero. */
+ if (optdecl[2] != ':') {
+ /* If the option was the last character in the string pointed to by
+ an element of argv, then optarg shall contain the next element
+ of argv, and optind shall be incremented by 2. If the resulting
+ value of optind is greater than argc, this indicates a missing
+ option-argument, and getopt() shall return an error indication.
+
+ Otherwise, optarg shall point to the string following the
+ option character in that element of argv, and optind shall be
+ incremented by 1.
+ */
+ if (++optind < argc) {
+ optarg = argv[optind];
+ } else {
+ /* If it detects a missing option-argument, it shall return the
+ colon character ( ':' ) if the first character of optstring
+ was a colon, or a question-mark character ( '?' ) otherwise.
+ */
+ optarg = NULL;
+ optchar = (optstring[0] == ':') ? ':' : '?';
+ }
+ } else {
+ optarg = NULL;
+ }
+ }
+
+ optcursor = NULL;
+ }
+ } else {
+ /* If getopt() encounters an option character that is not contained in
+ optstring, it shall return the question-mark ( '?' ) character. */
+ optchar = '?';
+ }
+
+ if (optcursor == NULL || *++optcursor == '\0')
+ ++optind;
+
+ return optchar;
+
+no_more_optchars:
+ optcursor = NULL;
+ return -1;
+}
+
+/* Implementation based on [1].
+
+[1] http://www.kernel.org/doc/man-pages/online/pages/man3/getopt.3.html
+*/
+int getopt_long(int argc, char* const argv[], const char* optstring,
+ const struct option* longopts, int* longindex) {
+ const struct option* o = longopts;
+ const struct option* match = NULL;
+ int num_matches = 0;
+ size_t argument_name_length = 0;
+ const char* current_argument = NULL;
+ int retval = -1;
+
+ optarg = NULL;
+ optopt = 0;
+
+ if (optind >= argc)
+ return -1;
+
+ if (strlen(argv[optind]) < 3 || strncmp(argv[optind], "--", 2) != 0)
+ return getopt(argc, argv, optstring);
+
+ /* It's an option; starts with -- and is longer than two chars. */
+ current_argument = argv[optind] + 2;
+ argument_name_length = strcspn(current_argument, "=");
+ for (; o->name; ++o) {
+ if (strncmp(o->name, current_argument, argument_name_length) == 0) {
+ match = o;
+ ++num_matches;
+ }
+ }
+
+ if (num_matches == 1) {
+ /* If longindex is not NULL, it points to a variable which is set to the
+ index of the long option relative to longopts. */
+ if (longindex)
+ *longindex = (int) (match - longopts);
+
+ /* If flag is NULL, then getopt_long() shall return val.
+ Otherwise, getopt_long() returns 0, and flag shall point to a variable
+ which shall be set to val if the option is found, but left unchanged if
+ the option is not found. */
+ if (match->flag)
+ *(match->flag) = match->val;
+
+ retval = match->flag ? 0 : match->val;
+
+ if (match->has_arg != no_argument) {
+ optarg = strchr(argv[optind], '=');
+ if (optarg != NULL)
+ ++optarg;
+
+ if (match->has_arg == required_argument) {
+ /* Only scan the next argv for required arguments. Behavior is not
+ specified, but has been observed with Ubuntu and Mac OSX. */
+ if (optarg == NULL && ++optind < argc) {
+ optarg = argv[optind];
+ }
+
+ if (optarg == NULL)
+ retval = ':';
+ }
+ } else if (strchr(argv[optind], '=')) {
+ /* An argument was provided to a non-argument option.
+ I haven't seen this specified explicitly, but both GNU and BSD-based
+ implementations show this behavior.
+ */
+ retval = '?';
+ }
+ } else {
+ /* Unknown option or ambiguous match. */
+ retval = '?';
+ }
+
+ ++optind;
+ return retval;
+}
projects / pistorm / blobdiff