diff options
Diffstat (limited to 'libs/glfw-3.3.8/deps/getopt.c')
| -rw-r--r-- | libs/glfw-3.3.8/deps/getopt.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/libs/glfw-3.3.8/deps/getopt.c b/libs/glfw-3.3.8/deps/getopt.c new file mode 100644 index 0000000..9743046 --- /dev/null +++ b/libs/glfw-3.3.8/deps/getopt.c @@ -0,0 +1,230 @@ +/* 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; +} |