Implement new argument parsing using getopt and add the corresponding library to externals

CMakeLists.txt

@@ -203,6 +203,10 @@ add_subdirectory(${INI_PREFIX})
 
 include_directories(externals/nihstro/include)
 
+if (MSVC)
+    add_subdirectory(externals/getopt)
+endif()
+
 # process subdirectories
 if(ENABLE_QT)
     include_directories(externals/qhexedit)

externals/getopt/CMakeLists.txt

@@ -0,0 +1,11 @@
+set(SRCS
+            getopt.c
+            )
+set(HEADERS
+            getopt.h
+            )
+
+create_directory_groups(${SRCS} ${HEADERS})
+add_library(getopt ${SRCS} ${HEADERS})
+target_compile_definitions(getopt INTERFACE STATIC_GETOPT)
+target_include_directories(getopt INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})

externals/getopt/getopt.c

@@ -0,0 +1,963 @@
+/* Getopt for Microsoft C
+This code is a modification of the Free Software Foundation, Inc.
+Getopt library for parsing command line argument the purpose was
+to provide a Microsoft Visual C friendly derivative. This code
+provides functionality for both Unicode and Multibyte builds.
+
+Date: 02/03/2011 - Ludvik Jerabek - Initial Release
+Version: 1.0
+Comment: Supports getopt, getopt_long, and getopt_long_only
+and POSIXLY_CORRECT environment flag
+License: LGPL
+
+Revisions:
+
+02/03/2011 - Ludvik Jerabek - Initial Release
+02/20/2011 - Ludvik Jerabek - Fixed compiler warnings at Level 4
+07/05/2011 - Ludvik Jerabek - Added no_argument, required_argument, optional_argument defs
+08/03/2011 - Ludvik Jerabek - Fixed non-argument runtime bug which caused runtime exception
+08/09/2011 - Ludvik Jerabek - Added code to export functions for DLL and LIB
+02/15/2012 - Ludvik Jerabek - Fixed _GETOPT_THROW definition missing in implementation file
+08/01/2012 - Ludvik Jerabek - Created separate functions for char and wchar_t characters so single dll can do both unicode and ansi
+10/15/2012 - Ludvik Jerabek - Modified to match latest GNU features
+06/19/2015 - Ludvik Jerabek - Fixed maximum option limitation caused by option_a (255) and option_w (65535) structure val variable
+
+**DISCLAIMER**
+THIS MATERIAL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+EITHER EXPRESS OR IMPLIED, INCLUDING, BUT Not LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE, OR NON-INFRINGEMENT. SOME JURISDICTIONS DO NOT ALLOW THE
+EXCLUSION OF IMPLIED WARRANTIES, SO THE ABOVE EXCLUSION MAY NOT
+APPLY TO YOU. IN NO EVENT WILL I BE LIABLE TO ANY PARTY FOR ANY
+DIRECT, INDIRECT, SPECIAL OR OTHER CONSEQUENTIAL DAMAGES FOR ANY
+USE OF THIS MATERIAL INCLUDING, WITHOUT LIMITATION, ANY LOST
+PROFITS, BUSINESS INTERRUPTION, LOSS OF PROGRAMS OR OTHER DATA ON
+YOUR INFORMATION HANDLING SYSTEM OR OTHERWISE, EVEN If WE ARE
+EXPRESSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+*/
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdlib.h>
+#include <stdio.h>
+#ifdef _MSC_VER
+#include <malloc.h>
+#endif
+#include "getopt.h"
+
+#ifdef __cplusplus
+#define _GETOPT_THROW throw()
+#else
+#define _GETOPT_THROW
+#endif
+
+int optind = 1;
+int opterr = 1;
+int optopt = '?';
+enum ENUM_ORDERING { REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER };
+
+
+static struct _getopt_data_a
+{
+    int optind;
+    int opterr;
+    int optopt;
+    char *optarg;
+    int __initialized;
+    char *__nextchar;
+    enum ENUM_ORDERING __ordering;
+    int __posixly_correct;
+    int __first_nonopt;
+    int __last_nonopt;
+} getopt_data_a;
+char *optarg_a;
+
+static void exchange_a(char **argv, struct _getopt_data_a *d)
+{
+    int bottom = d->__first_nonopt;
+    int middle = d->__last_nonopt;
+    int top = d->optind;
+    char *tem;
+    while (top > middle && middle > bottom)
+    {
+        if (top - middle > middle - bottom)
+        {
+            int len = middle - bottom;
+            register int i;
+            for (i = 0; i < len; i++)
+            {
+                tem = argv[bottom + i];
+                argv[bottom + i] = argv[top - (middle - bottom) + i];
+                argv[top - (middle - bottom) + i] = tem;
+            }
+            top -= len;
+        }
+        else
+        {
+            int len = top - middle;
+            register int i;
+            for (i = 0; i < len; i++)
+            {
+                tem = argv[bottom + i];
+                argv[bottom + i] = argv[middle + i];
+                argv[middle + i] = tem;
+            }
+            bottom += len;
+        }
+    }
+    d->__first_nonopt += (d->optind - d->__last_nonopt);
+    d->__last_nonopt = d->optind;
+}
+static const char *_getopt_initialize_a(const char *optstring, struct _getopt_data_a *d, int posixly_correct)
+{
+    d->__first_nonopt = d->__last_nonopt = d->optind;
+    d->__nextchar = NULL;
+    d->__posixly_correct = posixly_correct | !!getenv("POSIXLY_CORRECT");
+    if (optstring[0] == '-')
+    {
+        d->__ordering = RETURN_IN_ORDER;
+        ++optstring;
+    }
+    else if (optstring[0] == '+')
+    {
+        d->__ordering = REQUIRE_ORDER;
+        ++optstring;
+    }
+    else if (d->__posixly_correct)
+        d->__ordering = REQUIRE_ORDER;
+    else
+        d->__ordering = PERMUTE;
+    return optstring;
+}
+int _getopt_internal_r_a(int argc, char *const *argv, const char *optstring, const struct option_a *longopts, int *longind, int long_only, struct _getopt_data_a *d, int posixly_correct)
+{
+    int print_errors = d->opterr;
+    if (argc < 1)
+        return -1;
+    d->optarg = NULL;
+    if (d->optind == 0 || !d->__initialized)
+    {
+        if (d->optind == 0)
+            d->optind = 1;
+        optstring = _getopt_initialize_a(optstring, d, posixly_correct);
+        d->__initialized = 1;
+    }
+    else if (optstring[0] == '-' || optstring[0] == '+')
+        optstring++;
+    if (optstring[0] == ':')
+        print_errors = 0;
+    if (d->__nextchar == NULL || *d->__nextchar == '\0')
+    {
+        if (d->__last_nonopt > d->optind)
+            d->__last_nonopt = d->optind;
+        if (d->__first_nonopt > d->optind)
+            d->__first_nonopt = d->optind;
+        if (d->__ordering == PERMUTE)
+        {
+            if (d->__first_nonopt != d->__last_nonopt && d->__last_nonopt != d->optind)
+                exchange_a((char **)argv, d);
+            else if (d->__last_nonopt != d->optind)
+                d->__first_nonopt = d->optind;
+            while (d->optind < argc && (argv[d->optind][0] != '-' || argv[d->optind][1] == '\0'))
+                d->optind++;
+            d->__last_nonopt = d->optind;
+        }
+        if (d->optind != argc && !strcmp(argv[d->optind], "--"))
+        {
+            d->optind++;
+            if (d->__first_nonopt != d->__last_nonopt && d->__last_nonopt != d->optind)
+                exchange_a((char **)argv, d);
+            else if (d->__first_nonopt == d->__last_nonopt)
+                d->__first_nonopt = d->optind;
+            d->__last_nonopt = argc;
+            d->optind = argc;
+        }
+        if (d->optind == argc)
+        {
+            if (d->__first_nonopt != d->__last_nonopt)
+                d->optind = d->__first_nonopt;
+            return -1;
+        }
+        if ((argv[d->optind][0] != '-' || argv[d->optind][1] == '\0'))
+        {
+            if (d->__ordering == REQUIRE_ORDER)
+                return -1;
+            d->optarg = argv[d->optind++];
+            return 1;
+        }
+        d->__nextchar = (argv[d->optind] + 1 + (longopts != NULL && argv[d->optind][1] == '-'));
+    }
+    if (longopts != NULL && (argv[d->optind][1] == '-' || (long_only && (argv[d->optind][2] || !strchr(optstring, argv[d->optind][1])))))
+    {
+        char *nameend;
+        unsigned int namelen;
+        const struct option_a *p;
+        const struct option_a *pfound = NULL;
+        struct option_list
+        {
+            const struct option_a *p;
+            struct option_list *next;
+        } *ambig_list = NULL;
+        int exact = 0;
+        int indfound = -1;
+        int option_index;
+        for (nameend = d->__nextchar; *nameend && *nameend != '='; nameend++);
+        namelen = (unsigned int)(nameend - d->__nextchar);
+        for (p = longopts, option_index = 0; p->name; p++, option_index++)
+            if (!strncmp(p->name, d->__nextchar, namelen))
+            {
+                if (namelen == (unsigned int)strlen(p->name))
+                {
+                    pfound = p;
+                    indfound = option_index;
+                    exact = 1;
+                    break;
+                }
+                else if (pfound == NULL)
+                {
+                    pfound = p;
+                    indfound = option_index;
+                }
+                else if (long_only || pfound->has_arg != p->has_arg || pfound->flag != p->flag || pfound->val != p->val)
+                {
+                    struct option_list *newp = (struct option_list*)alloca(sizeof(*newp));
+                    newp->p = p;
+                    newp->next = ambig_list;
+                    ambig_list = newp;
+                }
+            }
+        if (ambig_list != NULL && !exact)
+        {
+            if (print_errors)
+            {
+                struct option_list first;
+                first.p = pfound;
+                first.next = ambig_list;
+                ambig_list = &first;
+                fprintf(stderr, "%s: option '%s' is ambiguous; possibilities:", argv[0], argv[d->optind]);
+                do
+                {
+                    fprintf(stderr, " '--%s'", ambig_list->p->name);
+                    ambig_list = ambig_list->next;
+                } while (ambig_list != NULL);
+                fputc('\n', stderr);
+            }
+            d->__nextchar += strlen(d->__nextchar);
+            d->optind++;
+            d->optopt = 0;
+            return '?';
+        }
+        if (pfound != NULL)
+        {
+            option_index = indfound;
+            d->optind++;
+            if (*nameend)
+            {
+                if (pfound->has_arg)
+                    d->optarg = nameend + 1;
+                else
+                {
+                    if (print_errors)
+                    {
+                        if (argv[d->optind - 1][1] == '-')
+                        {
+                            fprintf(stderr, "%s: option '--%s' doesn't allow an argument\n", argv[0], pfound->name);
+                        }
+                        else
+                        {
+                            fprintf(stderr, "%s: option '%c%s' doesn't allow an argument\n", argv[0], argv[d->optind - 1][0], pfound->name);
+                        }
+                    }
+                    d->__nextchar += strlen(d->__nextchar);
+                    d->optopt = pfound->val;
+                    return '?';
+                }
+            }
+            else if (pfound->has_arg == 1)
+            {
+                if (d->optind < argc)
+                    d->optarg = argv[d->optind++];
+                else
+                {
+                    if (print_errors)
+                    {
+                        fprintf(stderr, "%s: option '--%s' requires an argument\n", argv[0], pfound->name);
+                    }
+                    d->__nextchar += strlen(d->__nextchar);
+                    d->optopt = pfound->val;
+                    return optstring[0] == ':' ? ':' : '?';
+                }
+            }
+            d->__nextchar += strlen(d->__nextchar);
+            if (longind != NULL)
+                *longind = option_index;
+            if (pfound->flag)
+            {
+                *(pfound->flag) = pfound->val;
+                return 0;
+            }
+            return pfound->val;
+        }
+        if (!long_only || argv[d->optind][1] == '-' || strchr(optstring, *d->__nextchar) == NULL)
+        {
+            if (print_errors)
+            {
+                if (argv[d->optind][1] == '-')
+                {
+                    fprintf(stderr, "%s: unrecognized option '--%s'\n", argv[0], d->__nextchar);
+                }
+                else
+                {
+                    fprintf(stderr, "%s: unrecognized option '%c%s'\n", argv[0], argv[d->optind][0], d->__nextchar);
+                }
+            }
+            d->__nextchar = (char *)"";
+            d->optind++;
+            d->optopt = 0;
+            return '?';
+        }
+    }
+    {
+        char c = *d->__nextchar++;
+        char *temp = (char*)strchr(optstring, c);
+        if (*d->__nextchar == '\0')
+            ++d->optind;
+        if (temp == NULL || c == ':' || c == ';')
+        {
+            if (print_errors)
+            {
+                fprintf(stderr, "%s: invalid option -- '%c'\n", argv[0], c);
+            }
+            d->optopt = c;
+            return '?';
+        }
+        if (temp[0] == 'W' && temp[1] == ';')
+        {
+            char *nameend;
+            const struct option_a *p;
+            const struct option_a *pfound = NULL;
+            int exact = 0;
+            int ambig = 0;
+            int indfound = 0;
+            int option_index;
+            if (longopts == NULL)
+                goto no_longs;
+            if (*d->__nextchar != '\0')
+            {
+                d->optarg = d->__nextchar;
+                d->optind++;
+            }
+            else if (d->optind == argc)
+            {
+                if (print_errors)
+                {
+                    fprintf(stderr, "%s: option requires an argument -- '%c'\n", argv[0], c);
+                }
+                d->optopt = c;
+                if (optstring[0] == ':')
+                    c = ':';
+                else
+                    c = '?';
+                return c;
+            }
+            else
+                d->optarg = argv[d->optind++];
+            for (d->__nextchar = nameend = d->optarg; *nameend && *nameend != '='; nameend++);
+            for (p = longopts, option_index = 0; p->name; p++, option_index++)
+                if (!strncmp(p->name, d->__nextchar, nameend - d->__nextchar))
+                {
+                    if ((unsigned int)(nameend - d->__nextchar) == strlen(p->name))
+                    {
+                        pfound = p;
+                        indfound = option_index;
+                        exact = 1;
+                        break;
+                    }
+                    else if (pfound == NULL)
+                    {
+                        pfound = p;
+                        indfound = option_index;
+                    }
+                    else if (long_only || pfound->has_arg != p->has_arg || pfound->flag != p->flag || pfound->val != p->val)
+                        ambig = 1;
+                }
+            if (ambig && !exact)
+            {
+                if (print_errors)
+                {
+                    fprintf(stderr, "%s: option '-W %s' is ambiguous\n", argv[0], d->optarg);
+                }
+                d->__nextchar += strlen(d->__nextchar);
+                d->optind++;
+                return '?';
+            }
+            if (pfound != NULL)
+            {
+                option_index = indfound;
+                if (*nameend)
+                {
+                    if (pfound->has_arg)
+                        d->optarg = nameend + 1;
+                    else
+                    {
+                        if (print_errors)
+                        {
+                            fprintf(stderr, "%s: option '-W %s' doesn't allow an argument\n", argv[0], pfound->name);
+                        }
+                        d->__nextchar += strlen(d->__nextchar);
+                        return '?';
+                    }
+                }
+                else if (pfound->has_arg == 1)
+                {
+                    if (d->optind < argc)
+                        d->optarg = argv[d->optind++];
+                    else
+                    {
+                        if (print_errors)
+                        {
+                            fprintf(stderr, "%s: option '-W %s' requires an argument\n", argv[0], pfound->name);
+                        }
+                        d->__nextchar += strlen(d->__nextchar);
+                        return optstring[0] == ':' ? ':' : '?';
+                    }
+                }
+                else
+                    d->optarg = NULL;
+                d->__nextchar += strlen(d->__nextchar);
+                if (longind != NULL)
+                    *longind = option_index;
+                if (pfound->flag)
+                {
+                    *(pfound->flag) = pfound->val;
+                    return 0;
+                }
+                return pfound->val;
+            }
+        no_longs:
+            d->__nextchar = NULL;
+            return 'W';
+        }
+        if (temp[1] == ':')
+        {
+            if (temp[2] == ':')
+            {
+                if (*d->__nextchar != '\0')
+                {
+                    d->optarg = d->__nextchar;
+                    d->optind++;
+                }
+                else
+                    d->optarg = NULL;
+                d->__nextchar = NULL;
+            }
+            else
+            {
+                if (*d->__nextchar != '\0')
+                {
+                    d->optarg = d->__nextchar;
+                    d->optind++;
+                }
+                else if (d->optind == argc)
+                {
+                    if (print_errors)
+                    {
+                        fprintf(stderr, "%s: option requires an argument -- '%c'\n", argv[0], c);
+                    }
+                    d->optopt = c;
+                    if (optstring[0] == ':')
+                        c = ':';
+                    else
+                        c = '?';
+                }
+                else
+                    d->optarg = argv[d->optind++];
+                d->__nextchar = NULL;
+            }
+        }
+        return c;
+    }
+}
+int _getopt_internal_a(int argc, char *const *argv, const char *optstring, const struct option_a *longopts, int *longind, int long_only, int posixly_correct)
+{
+    int result;
+    getopt_data_a.optind = optind;
+    getopt_data_a.opterr = opterr;
+    result = _getopt_internal_r_a(argc, argv, optstring, longopts, longind, long_only, &getopt_data_a, posixly_correct);
+    optind = getopt_data_a.optind;
+    optarg_a = getopt_data_a.optarg;
+    optopt = getopt_data_a.optopt;
+    return result;
+}
+int getopt_a(int argc, char *const *argv, const char *optstring) _GETOPT_THROW
+{
+    return _getopt_internal_a(argc, argv, optstring, (const struct option_a *) 0, (int *)0, 0, 0);
+}
+int getopt_long_a(int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index) _GETOPT_THROW
+{
+    return _getopt_internal_a(argc, argv, options, long_options, opt_index, 0, 0);
+}
+int getopt_long_only_a(int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index) _GETOPT_THROW
+{
+    return _getopt_internal_a(argc, argv, options, long_options, opt_index, 1, 0);
+}
+int _getopt_long_r_a(int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index, struct _getopt_data_a *d)
+{
+    return _getopt_internal_r_a(argc, argv, options, long_options, opt_index, 0, d, 0);
+}
+int _getopt_long_only_r_a(int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index, struct _getopt_data_a *d)
+{
+    return _getopt_internal_r_a(argc, argv, options, long_options, opt_index, 1, d, 0);
+}
+
+
+static struct _getopt_data_w
+{
+    int optind;
+    int opterr;
+    int optopt;
+    wchar_t *optarg;
+    int __initialized;
+    wchar_t *__nextchar;
+    enum ENUM_ORDERING __ordering;
+    int __posixly_correct;
+    int __first_nonopt;
+    int __last_nonopt;
+} getopt_data_w;
+wchar_t *optarg_w;
+
+static void exchange_w(wchar_t **argv, struct _getopt_data_w *d)
+{
+    int bottom = d->__first_nonopt;
+    int middle = d->__last_nonopt;
+    int top = d->optind;
+    wchar_t *tem;
+    while (top > middle && middle > bottom)
+    {
+        if (top - middle > middle - bottom)
+        {
+            int len = middle - bottom;
+            register int i;
+            for (i = 0; i < len; i++)
+            {
+                tem = argv[bottom + i];
+                argv[bottom + i] = argv[top - (middle - bottom) + i];
+                argv[top - (middle - bottom) + i] = tem;
+            }
+            top -= len;
+        }
+        else
+        {
+            int len = top - middle;
+            register int i;
+            for (i = 0; i < len; i++)
+            {
+                tem = argv[bottom + i];
+                argv[bottom + i] = argv[middle + i];
+                argv[middle + i] = tem;
+            }
+            bottom += len;
+        }
+    }
+    d->__first_nonopt += (d->optind - d->__last_nonopt);
+    d->__last_nonopt = d->optind;
+}
+static const wchar_t *_getopt_initialize_w(const wchar_t *optstring, struct _getopt_data_w *d, int posixly_correct)
+{
+    d->__first_nonopt = d->__last_nonopt = d->optind;
+    d->__nextchar = NULL;
+    d->__posixly_correct = posixly_correct | !!_wgetenv(L"POSIXLY_CORRECT");
+    if (optstring[0] == L'-')
+    {
+        d->__ordering = RETURN_IN_ORDER;
+        ++optstring;
+    }
+    else if (optstring[0] == L'+')
+    {
+        d->__ordering = REQUIRE_ORDER;
+        ++optstring;
+    }
+    else if (d->__posixly_correct)
+        d->__ordering = REQUIRE_ORDER;
+    else
+        d->__ordering = PERMUTE;
+    return optstring;
+}
+int _getopt_internal_r_w(int argc, wchar_t *const *argv, const wchar_t *optstring, const struct option_w *longopts, int *longind, int long_only, struct _getopt_data_w *d, int posixly_correct)
+{
+    int print_errors = d->opterr;
+    if (argc < 1)
+        return -1;
+    d->optarg = NULL;
+    if (d->optind == 0 || !d->__initialized)
+    {
+        if (d->optind == 0)
+            d->optind = 1;
+        optstring = _getopt_initialize_w(optstring, d, posixly_correct);
+        d->__initialized = 1;
+    }
+    else if (optstring[0] == L'-' || optstring[0] == L'+')
+        optstring++;
+    if (optstring[0] == L':')
+        print_errors = 0;
+    if (d->__nextchar == NULL || *d->__nextchar == L'\0')
+    {
+        if (d->__last_nonopt > d->optind)
+            d->__last_nonopt = d->optind;
+        if (d->__first_nonopt > d->optind)
+            d->__first_nonopt = d->optind;
+        if (d->__ordering == PERMUTE)
+        {
+            if (d->__first_nonopt != d->__last_nonopt && d->__last_nonopt != d->optind)
+                exchange_w((wchar_t **)argv, d);
+            else if (d->__last_nonopt != d->optind)
+                d->__first_nonopt = d->optind;
+            while (d->optind < argc && (argv[d->optind][0] != L'-' || argv[d->optind][1] == L'\0'))
+                d->optind++;
+            d->__last_nonopt = d->optind;
+        }
+        if (d->optind != argc && !wcscmp(argv[d->optind], L"--"))
+        {
+            d->optind++;
+            if (d->__first_nonopt != d->__last_nonopt && d->__last_nonopt != d->optind)
+                exchange_w((wchar_t **)argv, d);
+            else if (d->__first_nonopt == d->__last_nonopt)
+                d->__first_nonopt = d->optind;
+            d->__last_nonopt = argc;
+            d->optind = argc;
+        }
+        if (d->optind == argc)
+        {
+            if (d->__first_nonopt != d->__last_nonopt)
+                d->optind = d->__first_nonopt;
+            return -1;
+        }
+        if ((argv[d->optind][0] != L'-' || argv[d->optind][1] == L'\0'))
+        {
+            if (d->__ordering == REQUIRE_ORDER)
+                return -1;
+            d->optarg = argv[d->optind++];
+            return 1;
+        }
+        d->__nextchar = (argv[d->optind] + 1 + (longopts != NULL && argv[d->optind][1] == L'-'));
+    }
+    if (longopts != NULL && (argv[d->optind][1] == L'-' || (long_only && (argv[d->optind][2] || !wcschr(optstring, argv[d->optind][1])))))
+    {
+        wchar_t *nameend;
+        unsigned int namelen;
+        const struct option_w *p;
+        const struct option_w *pfound = NULL;
+        struct option_list
+        {
+            const struct option_w *p;
+            struct option_list *next;
+        } *ambig_list = NULL;
+        int exact = 0;
+        int indfound = -1;
+        int option_index;
+        for (nameend = d->__nextchar; *nameend && *nameend != L'='; nameend++);
+        namelen = (unsigned int)(nameend - d->__nextchar);
+        for (p = longopts, option_index = 0; p->name; p++, option_index++)
+            if (!wcsncmp(p->name, d->__nextchar, namelen))
+            {
+                if (namelen == (unsigned int)wcslen(p->name))
+                {
+                    pfound = p;
+                    indfound = option_index;
+                    exact = 1;
+                    break;
+                }
+                else if (pfound == NULL)
+                {
+                    pfound = p;
+                    indfound = option_index;
+                }
+                else if (long_only || pfound->has_arg != p->has_arg || pfound->flag != p->flag || pfound->val != p->val)
+                {
+                    struct option_list *newp = (struct option_list*)alloca(sizeof(*newp));
+                    newp->p = p;
+                    newp->next = ambig_list;
+                    ambig_list = newp;
+                }
+            }
+        if (ambig_list != NULL && !exact)
+        {
+            if (print_errors)
+            {
+                struct option_list first;
+                first.p = pfound;
+                first.next = ambig_list;
+                ambig_list = &first;
+                fwprintf(stderr, L"%s: option '%s' is ambiguous; possibilities:", argv[0], argv[d->optind]);
+                do
+                {
+                    fwprintf(stderr, L" '--%s'", ambig_list->p->name);
+                    ambig_list = ambig_list->next;
+                } while (ambig_list != NULL);
+                fputwc(L'\n', stderr);
+            }
+            d->__nextchar += wcslen(d->__nextchar);
+            d->optind++;
+            d->optopt = 0;
+            return L'?';
+        }
+        if (pfound != NULL)
+        {
+            option_index = indfound;
+            d->optind++;
+            if (*nameend)
+            {
+                if (pfound->has_arg)
+                    d->optarg = nameend + 1;
+                else
+                {
+                    if (print_errors)
+                    {
+                        if (argv[d->optind - 1][1] == L'-')
+                        {
+                            fwprintf(stderr, L"%s: option '--%s' doesn't allow an argument\n", argv[0], pfound->name);
+                        }
+                        else
+                        {
+                            fwprintf(stderr, L"%s: option '%c%s' doesn't allow an argument\n", argv[0], argv[d->optind - 1][0], pfound->name);
+                        }
+                    }
+                    d->__nextchar += wcslen(d->__nextchar);
+                    d->optopt = pfound->val;
+                    return L'?';
+                }
+            }
+            else if (pfound->has_arg == 1)
+            {
+                if (d->optind < argc)
+                    d->optarg = argv[d->optind++];
+                else
+                {
+                    if (print_errors)
+                    {
+                        fwprintf(stderr, L"%s: option '--%s' requires an argument\n", argv[0], pfound->name);
+                    }
+                    d->__nextchar += wcslen(d->__nextchar);
+                    d->optopt = pfound->val;
+                    return optstring[0] == L':' ? L':' : L'?';
+                }
+            }
+            d->__nextchar += wcslen(d->__nextchar);
+            if (longind != NULL)
+                *longind = option_index;
+            if (pfound->flag)
+            {
+                *(pfound->flag) = pfound->val;
+                return 0;
+            }
+            return pfound->val;
+        }
+        if (!long_only || argv[d->optind][1] == L'-' || wcschr(optstring, *d->__nextchar) == NULL)
+        {
+            if (print_errors)
+            {
+                if (argv[d->optind][1] == L'-')
+                {
+                    fwprintf(stderr, L"%s: unrecognized option '--%s'\n", argv[0], d->__nextchar);
+                }
+                else
+                {
+                    fwprintf(stderr, L"%s: unrecognized option '%c%s'\n", argv[0], argv[d->optind][0], d->__nextchar);
+                }
+            }
+            d->__nextchar = (wchar_t *)L"";
+            d->optind++;
+            d->optopt = 0;
+            return L'?';
+        }
+    }
+    {
+        wchar_t c = *d->__nextchar++;
+        wchar_t *temp = (wchar_t*)wcschr(optstring, c);
+        if (*d->__nextchar == L'\0')
+            ++d->optind;
+        if (temp == NULL || c == L':' || c == L';')
+        {
+            if (print_errors)
+            {
+                fwprintf(stderr, L"%s: invalid option -- '%c'\n", argv[0], c);
+            }
+            d->optopt = c;
+            return L'?';
+        }
+        if (temp[0] == L'W' && temp[1] == L';')
+        {
+            wchar_t *nameend;
+            const struct option_w *p;
+            const struct option_w *pfound = NULL;
+            int exact = 0;
+            int ambig = 0;
+            int indfound = 0;
+            int option_index;
+            if (longopts == NULL)
+                goto no_longs;
+            if (*d->__nextchar != L'\0')
+            {
+                d->optarg = d->__nextchar;
+                d->optind++;
+            }
+            else if (d->optind == argc)
+            {
+                if (print_errors)
+                {
+                    fwprintf(stderr, L"%s: option requires an argument -- '%c'\n", argv[0], c);
+                }
+                d->optopt = c;
+                if (optstring[0] == L':')
+                    c = L':';
+                else
+                    c = L'?';
+                return c;
+            }
+            else
+                d->optarg = argv[d->optind++];
+            for (d->__nextchar = nameend = d->optarg; *nameend && *nameend != L'='; nameend++);
+            for (p = longopts, option_index = 0; p->name; p++, option_index++)
+                if (!wcsncmp(p->name, d->__nextchar, nameend - d->__nextchar))
+                {
+                    if ((unsigned int)(nameend - d->__nextchar) == wcslen(p->name))
+                    {
+                        pfound = p;
+                        indfound = option_index;
+                        exact = 1;
+                        break;
+                    }
+                    else if (pfound == NULL)
+                    {
+                        pfound = p;
+                        indfound = option_index;
+                    }
+                    else if (long_only || pfound->has_arg != p->has_arg || pfound->flag != p->flag || pfound->val != p->val)
+                        ambig = 1;
+                }
+            if (ambig && !exact)
+            {
+                if (print_errors)
+                {
+                    fwprintf(stderr, L"%s: option '-W %s' is ambiguous\n", argv[0], d->optarg);
+                }
+                d->__nextchar += wcslen(d->__nextchar);
+                d->optind++;
+                return L'?';
+            }
+            if (pfound != NULL)
+            {
+                option_index = indfound;
+                if (*nameend)
+                {
+                    if (pfound->has_arg)
+                        d->optarg = nameend + 1;
+                    else
+                    {
+                        if (print_errors)
+                        {
+                            fwprintf(stderr, L"%s: option '-W %s' doesn't allow an argument\n", argv[0], pfound->name);
+                        }
+                        d->__nextchar += wcslen(d->__nextchar);
+                        return L'?';
+                    }
+                }
+                else if (pfound->has_arg == 1)
+                {
+                    if (d->optind < argc)
+                        d->optarg = argv[d->optind++];
+                    else
+                    {
+                        if (print_errors)
+                        {
+                            fwprintf(stderr, L"%s: option '-W %s' requires an argument\n", argv[0], pfound->name);
+                        }
+                        d->__nextchar += wcslen(d->__nextchar);
+                        return optstring[0] == L':' ? L':' : L'?';
+                    }
+                }
+                else
+                    d->optarg = NULL;
+                d->__nextchar += wcslen(d->__nextchar);
+                if (longind != NULL)
+                    *longind = option_index;
+                if (pfound->flag)
+                {
+                    *(pfound->flag) = pfound->val;
+                    return 0;
+                }
+                return pfound->val;
+            }
+        no_longs:
+            d->__nextchar = NULL;
+            return L'W';
+        }
+        if (temp[1] == L':')
+        {
+            if (temp[2] == L':')
+            {
+                if (*d->__nextchar != L'\0')
+                {
+                    d->optarg = d->__nextchar;
+                    d->optind++;
+                }
+                else
+                    d->optarg = NULL;
+                d->__nextchar = NULL;
+            }
+            else
+            {
+                if (*d->__nextchar != L'\0')
+                {
+                    d->optarg = d->__nextchar;
+                    d->optind++;
+                }
+                else if (d->optind == argc)
+                {
+                    if (print_errors)
+                    {
+                        fwprintf(stderr, L"%s: option requires an argument -- '%c'\n", argv[0], c);
+                    }
+                    d->optopt = c;
+                    if (optstring[0] == L':')
+                        c = L':';
+                    else
+                        c = L'?';
+                }
+                else
+                    d->optarg = argv[d->optind++];
+                d->__nextchar = NULL;
+            }
+        }
+        return c;
+    }
+}
+int _getopt_internal_w(int argc, wchar_t *const *argv, const wchar_t *optstring, const struct option_w *longopts, int *longind, int long_only, int posixly_correct)
+{
+    int result;
+    getopt_data_w.optind = optind;
+    getopt_data_w.opterr = opterr;
+    result = _getopt_internal_r_w(argc, argv, optstring, longopts, longind, long_only, &getopt_data_w, posixly_correct);
+    optind = getopt_data_w.optind;
+    optarg_w = getopt_data_w.optarg;
+    optopt = getopt_data_w.optopt;
+    return result;
+}
+int getopt_w(int argc, wchar_t *const *argv, const wchar_t *optstring) _GETOPT_THROW
+{
+    return _getopt_internal_w(argc, argv, optstring, (const struct option_w *) 0, (int *)0, 0, 0);
+}
+int getopt_long_w(int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index) _GETOPT_THROW
+{
+    return _getopt_internal_w(argc, argv, options, long_options, opt_index, 0, 0);
+}
+int getopt_long_only_w(int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index) _GETOPT_THROW
+{
+    return _getopt_internal_w(argc, argv, options, long_options, opt_index, 1, 0);
+}
+int _getopt_long_r_w(int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index, struct _getopt_data_w *d)
+{
+    return _getopt_internal_r_w(argc, argv, options, long_options, opt_index, 0, d, 0);
+}
+int _getopt_long_only_r_w(int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index, struct _getopt_data_w *d)
+{
+    return _getopt_internal_r_w(argc, argv, options, long_options, opt_index, 1, d, 0);
+}

externals/getopt/getopt.h

@@ -0,0 +1,136 @@
+/* Getopt for Microsoft C
+This code is a modification of the Free Software Foundation, Inc.
+Getopt library for parsing command line argument the purpose was
+to provide a Microsoft Visual C friendly derivative. This code
+provides functionality for both Unicode and Multibyte builds.
+
+Date: 02/03/2011 - Ludvik Jerabek - Initial Release
+Version: 1.0
+Comment: Supports getopt, getopt_long, and getopt_long_only
+and POSIXLY_CORRECT environment flag
+License: LGPL
+
+Revisions:
+
+02/03/2011 - Ludvik Jerabek - Initial Release
+02/20/2011 - Ludvik Jerabek - Fixed compiler warnings at Level 4
+07/05/2011 - Ludvik Jerabek - Added no_argument, required_argument, optional_argument defs
+08/03/2011 - Ludvik Jerabek - Fixed non-argument runtime bug which caused runtime exception
+08/09/2011 - Ludvik Jerabek - Added code to export functions for DLL and LIB
+02/15/2012 - Ludvik Jerabek - Fixed _GETOPT_THROW definition missing in implementation file
+08/01/2012 - Ludvik Jerabek - Created separate functions for char and wchar_t characters so single dll can do both unicode and ansi
+10/15/2012 - Ludvik Jerabek - Modified to match latest GNU features
+06/19/2015 - Ludvik Jerabek - Fixed maximum option limitation caused by option_a (255) and option_w (65535) structure val variable
+
+**DISCLAIMER**
+THIS MATERIAL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+EITHER EXPRESS OR IMPLIED, INCLUDING, BUT Not LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE, OR NON-INFRINGEMENT. SOME JURISDICTIONS DO NOT ALLOW THE
+EXCLUSION OF IMPLIED WARRANTIES, SO THE ABOVE EXCLUSION MAY NOT
+APPLY TO YOU. IN NO EVENT WILL I BE LIABLE TO ANY PARTY FOR ANY
+DIRECT, INDIRECT, SPECIAL OR OTHER CONSEQUENTIAL DAMAGES FOR ANY
+USE OF THIS MATERIAL INCLUDING, WITHOUT LIMITATION, ANY LOST
+PROFITS, BUSINESS INTERRUPTION, LOSS OF PROGRAMS OR OTHER DATA ON
+YOUR INFORMATION HANDLING SYSTEM OR OTHERWISE, EVEN If WE ARE
+EXPRESSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+*/
+#ifndef __GETOPT_H_
+#define __GETOPT_H_
+
+#ifdef _GETOPT_API
+#undef _GETOPT_API
+#endif
+
+#if defined(EXPORTS_GETOPT) && defined(STATIC_GETOPT)
+#error "The preprocessor definitions of EXPORTS_GETOPT and STATIC_GETOPT can only be used individually"
+#elif defined(STATIC_GETOPT)
+#pragma message("Warning static builds of getopt violate the Lesser GNU Public License")
+#define _GETOPT_API
+#elif defined(EXPORTS_GETOPT)
+#pragma message("Exporting getopt library")
+#define _GETOPT_API __declspec(dllexport)
+#else
+#pragma message("Importing getopt library")
+#define _GETOPT_API __declspec(dllimport)
+#endif
+
+// Change behavior for C\C++
+#ifdef __cplusplus
+#define _BEGIN_EXTERN_C extern "C" {
+#define _END_EXTERN_C }
+#define _GETOPT_THROW throw()
+#else
+#define _BEGIN_EXTERN_C
+#define _END_EXTERN_C
+#define _GETOPT_THROW
+#endif
+
+// Standard GNU options
+#define null_argument 0
+#define no_argument 0
+#define required_argument 1
+#define optional_argument 2
+
+// Shorter Options
+#define ARG_NULL 0
+#define ARG_NONE 0
+#define ARG_REQ 1
+#define ARG_OPT 2
+
+#include <string.h>
+#include <wchar.h>
+
+_BEGIN_EXTERN_C
+
+extern _GETOPT_API int optind;
+extern _GETOPT_API int opterr;
+extern _GETOPT_API int optopt;
+
+// Ansi
+struct option_a
+{
+    const char* name;
+    int has_arg;
+    int *flag;
+    int val;
+};
+extern _GETOPT_API char *optarg_a;
+extern _GETOPT_API int getopt_a(int argc, char *const *argv, const char *optstring) _GETOPT_THROW;
+extern _GETOPT_API int getopt_long_a(int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index) _GETOPT_THROW;
+extern _GETOPT_API int getopt_long_only_a(int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index) _GETOPT_THROW;
+
+// Unicode
+struct option_w
+{
+    const wchar_t* name;
+    int has_arg;
+    int *flag;
+    int val;
+};
+extern _GETOPT_API wchar_t *optarg_w;
+extern _GETOPT_API int getopt_w(int argc, wchar_t *const *argv, const wchar_t *optstring) _GETOPT_THROW;
+extern _GETOPT_API int getopt_long_w(int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index) _GETOPT_THROW;
+extern _GETOPT_API int getopt_long_only_w(int argc, wchar_t *const *argv, const wchar_t *options, const struct option_w *long_options, int *opt_index) _GETOPT_THROW;
+
+_END_EXTERN_C
+
+#undef _BEGIN_EXTERN_C
+#undef _END_EXTERN_C
+#undef _GETOPT_THROW
+#undef _GETOPT_API
+
+#ifdef _UNICODE
+#define getopt getopt_w
+#define getopt_long getopt_long_w
+#define getopt_long_only getopt_long_only_w
+#define option option_w
+#define optarg optarg_w
+#else
+#define getopt getopt_a
+#define getopt_long getopt_long_a
+#define getopt_long_only getopt_long_only_a
+#define option option_a
+#define optarg optarg_a
+#endif
+#endif  // __GETOPT_H_

src/citra/CMakeLists.txt

@@ -16,8 +16,11 @@ create_directory_groups(${SRCS} ${HEADERS})
 add_executable(citra ${SRCS} ${HEADERS})
 target_link_libraries(citra core common video_core)
 target_link_libraries(citra ${GLFW_LIBRARIES} ${OPENGL_gl_LIBRARY} inih)
+if (MSVC)
+    target_link_libraries(citra getopt)
+endif()
 target_link_libraries(citra ${PLATFORM_LIBRARIES})
 
 if(${CMAKE_SYSTEM_NAME} MATCHES "Linux|FreeBSD|OpenBSD|NetBSD")
     install(TARGETS citra RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}/bin")
-endif()
+endif()

src/citra/citra.cpp

@@ -3,6 +3,15 @@
 // Refer to the license.txt file included.
 
 #include <string>
+#include <thread>
+#include <iostream>
+
+#ifdef _MSC_VER
+#include <getopt.h>
+#else
+#include <unistd.h>
+#include <getopt.h>
+#endif
 
 #include "common/logging/log.h"
 #include "common/logging/backend.h"
@@ -18,12 +27,39 @@
 
 #include "video_core/video_core.h"
 
+
+static void PrintHelp()
+{
+    std::cout << "Usage: citra <filename>" << std::endl;
+}
+
 /// Application entry point
 int main(int argc, char **argv) {
+    int option_index = 0;
+    std::string boot_filename;
+    static struct option long_options[] = {
+        { "help", no_argument, 0, 'h' },
+        { 0, 0, 0, 0 }
+    };
+
+    while (optind < argc) {
+        char arg = getopt_long(argc, argv, ":h", long_options, &option_index);
+        if (arg != -1) {
+            switch (arg) {
+            case 'h':
+                PrintHelp();
+                return 0;
+            }
+        } else {
+            boot_filename = argv[optind];
+            optind++;
+        }
+    }
+
     Log::Filter log_filter(Log::Level::Debug);
     Log::SetFilter(&log_filter);
 
-    if (argc < 2) {
+    if (boot_filename.empty()) {
         LOG_CRITICAL(Frontend, "Failed to load ROM: No ROM specified");
         return -1;
     }
@@ -31,7 +67,7 @@ int main(int argc, char **argv) {
     Config config;
     log_filter.ParseFilterString(Settings::values.log_filter);
 
-    std::string boot_filename = argv[1];
+
     EmuWindow_GLFW* emu_window = new EmuWindow_GLFW;
 
     VideoCore::g_hw_renderer_enabled = Settings::values.use_hw_renderer;