選択できるのは25トピックまでです。
トピックは、先頭が英数字で、英数字とダッシュ('-')を使用した35文字以内のものにしてください。
230 行
7.9 KiB
230 行
7.9 KiB
/* 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;
|
|
}
|