Wrap fopen calls under Windows

The idea is that all filenames we deal with are encoded as UTF-8, but the
Windows functions that take a char string interpret it using the ANSI codepage.
So instead, we convert the UTF-8 string to a wchar string, and then use the
wchar functions for proper extended character filename support.

Alc/ALc.c

@@ -893,7 +893,7 @@ static void alc_initconfig(void)
     str = getenv("ALSOFT_LOGFILE");
     if(str && str[0])
     {
-        FILE *logfile = fopen(str, "wt");
+        FILE *logfile = al_fopen(str, "wt");
         if(logfile) LogFile = logfile;
         else ERR("Failed to open log file '%s'\n", str);
     }

Alc/alcConfig.c

@@ -32,13 +32,13 @@
 #include <stdio.h>
 #include <ctype.h>
 #include <string.h>
-
-#include "alMain.h"
-
 #ifdef _WIN32_IE
 #include <shlobj.h>
 #endif
 
+#include "alMain.h"
+#include "compat.h"
+
 
 typedef struct ConfigEntry {
     char *key;
@@ -304,7 +304,7 @@ void ReadALConfig(void)
         snprintf(buffer+p, sizeof(buffer)-p, "\\alsoft.ini");
 
         TRACE("Loading config %s...\n", buffer);
-        f = fopen(buffer, "rt");
+        f = al_fopen(buffer, "rt");
         if(f)
         {
             LoadConfigFromFile(f);
@@ -315,7 +315,7 @@ void ReadALConfig(void)
     str = "/etc/openal/alsoft.conf";
 
     TRACE("Loading config %s...\n", str);
-    f = fopen(str, "r");
+    f = al_fopen(str, "r");
     if(f)
     {
         LoadConfigFromFile(f);
@@ -346,7 +346,7 @@ void ReadALConfig(void)
             buffer[sizeof(buffer)-1] = 0;
 
             TRACE("Loading config %s...\n", next);
-            f = fopen(next, "r");
+            f = al_fopen(next, "r");
             if(f)
             {
                 LoadConfigFromFile(f);
@@ -362,7 +362,7 @@ void ReadALConfig(void)
         snprintf(buffer, sizeof(buffer), "%s/.alsoftrc", str);
 
         TRACE("Loading config %s...\n", buffer);
-        f = fopen(buffer, "r");
+        f = al_fopen(buffer, "r");
         if(f)
         {
             LoadConfigFromFile(f);
@@ -381,7 +381,7 @@ void ReadALConfig(void)
     if(buffer[0] != 0)
     {
         TRACE("Loading config %s...\n", buffer);
-        f = fopen(buffer, "r");
+        f = al_fopen(buffer, "r");
         if(f)
         {
             LoadConfigFromFile(f);
@@ -393,7 +393,7 @@ void ReadALConfig(void)
     if((str=getenv("ALSOFT_CONF")) != NULL && *str)
     {
         TRACE("Loading config %s...\n", str);
-        f = fopen(str, "r");
+        f = al_fopen(str, "r");
         if(f)
         {
             LoadConfigFromFile(f);

Alc/backends/wave.c

@@ -183,7 +183,7 @@ static ALCenum wave_open_playback(ALCdevice *device, const ALCchar *deviceName)
 
     data = (wave_data*)calloc(1, sizeof(wave_data));
 
-    data->f = fopen(fname, "wb");
+    data->f = al_fopen(fname, "wb");
     if(!data->f)
     {
         free(data);

Alc/compat.h

@@ -23,6 +23,9 @@ inline int alsched_yield(void)
 
 WCHAR *strdupW(const WCHAR *str);
 
+/* Opens a file with standard I/O. The filename is expected to be UTF-8. */
+FILE *al_fopen(const char *fname, const char *mode);
+
 #define HAVE_DYNLOAD 1
 
 #else
@@ -50,6 +53,8 @@ void Sleep(ALuint t);
 
 #define alsched_yield sched_yield
 
+#define al_fopen(_n, _m) fopen((_n), (_m))
+
 #if defined(HAVE_DLFCN_H) && !defined(IN_IDE_PARSER)
 #define HAVE_DYNLOAD 1
 #endif

Alc/helpers.c

@@ -375,6 +375,37 @@ WCHAR *strdupW(const WCHAR *str)
     return ret;
 }
 
+
+FILE *al_fopen(const char *fname, const char *mode)
+{
+    WCHAR *wname=NULL, *wmode=NULL;
+    FILE *file = NULL;
+    int len;
+
+    if((len=MultiByteToWideChar(CP_UTF8, 0, fname, -1, NULL, 0)) > 0)
+    {
+        wname = calloc(sizeof(WCHAR), len);
+        MultiByteToWideChar(CP_UTF8, 0, fname, -1, wname, len);
+    }
+    if((len=MultiByteToWideChar(CP_UTF8, 0, mode, -1, NULL, 0)) > 0)
+    {
+        wmode = calloc(sizeof(WCHAR), len);
+        MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, len);
+    }
+
+    if(!wname)
+        ERR("Failed to convert UTF-8 filename: \"%s\"\n", fname);
+    else if(!wmode)
+        ERR("Failed to convert UTF-8 mode: \"%s\"\n", mode);
+    else
+        file = _wfopen(wname, wmode);
+
+    free(wname);
+    free(wmode);
+
+    return file;
+}
+
 #else
 
 #include <pthread.h>
@@ -526,7 +557,7 @@ FILE *OpenDataFile(const char *fname, const char *subdir)
     /* If the path is absolute, open it directly. */
     if(fname[0] != '\0' && fname[1] == ':' && (fname[2] == '\\' || fname[2] == '/'))
     {
-        if((f=fopen(fname, "rb")) != NULL)
+        if((f=al_fopen(fname, "rb")) != NULL)
         {
             TRACE("Opened %s\n", fname);
             return f;
@@ -554,7 +585,7 @@ FILE *OpenDataFile(const char *fname, const char *subdir)
                 buffer[len] = '\\';
         }
 
-        if((f=fopen(buffer, "rb")) != NULL)
+        if((f=al_fopen(buffer, "rb")) != NULL)
         {
             TRACE("Opened %s\n", buffer);
             return f;
@@ -566,7 +597,7 @@ FILE *OpenDataFile(const char *fname, const char *subdir)
 
     if(fname[0] == '/')
     {
-        if((f=fopen(fname, "rb")) != NULL)
+        if((f=al_fopen(fname, "rb")) != NULL)
         {
             TRACE("Opened %s\n", fname);
             return f;
@@ -581,7 +612,7 @@ FILE *OpenDataFile(const char *fname, const char *subdir)
         snprintf(buffer, sizeof(buffer), "%s/.local/share/%s/%s", str, subdir, fname);
     if(buffer[0])
     {
-        if((f=fopen(buffer, "rb")) != NULL)
+        if((f=al_fopen(buffer, "rb")) != NULL)
         {
             TRACE("Opened %s\n", buffer);
             return f;
@@ -612,7 +643,7 @@ FILE *OpenDataFile(const char *fname, const char *subdir)
         buffer[len] = '\0';
         snprintf(buffer+len, sizeof(buffer)-len, "/%s/%s", subdir, fname);
 
-        if((f=fopen(buffer, "rb")) != NULL)
+        if((f=al_fopen(buffer, "rb")) != NULL)
         {
             TRACE("Opened %s\n", buffer);
             return f;