Dirent for win32.

src/unix_file_system.cpp

@@ -23,7 +23,12 @@
 
 #include <sys/types.h>
 #include <fstream>
-#include <dirent.h>
+#ifdef _MSC_VER
+// MSVC doesn't include dirent.h, so we use this emulated win32 version
+#  include "win32/dirent.h"
+#else
+#  include <dirent.h>
+#endif
 #include <stdlib.h>
 #include <string.h>
 

src/win32/dirent.c

@@ -0,0 +1,150 @@
+/*
+
+    Implementation of POSIX directory browsing functions and types for Win32.
+
+    Author:  Kevlin Henney (kevlin@acm.org, kevlin@curbralan.com)
+    History: Created March 1997. Updated June 2003 and July 2012.
+    Rights:  See end of file.
+
+*/
+
+#include "precompiled.h"
+
+#include "dirent.h"
+#include <errno.h>
+#include <io.h> /* _findfirst and _findnext set errno iff they return -1 */
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+typedef ptrdiff_t handle_type; /* C99's intptr_t not sufficiently portable */
+
+struct DIR
+{
+    handle_type         handle; /* -1 for failed rewind */
+    struct _finddata_t  info;
+    struct dirent       result; /* d_name null iff first time */
+    char                *name;  /* null-terminated char string */
+};
+
+DIR *opendir(const char *name)
+{
+    DIR *dir = 0;
+
+    if(name && name[0])
+    {
+        size_t base_length = strlen(name);
+        const char *all = /* search pattern must end with suitable wildcard */
+            strchr("/\\", name[base_length - 1]) ? "*" : "/*";
+
+        if((dir = (DIR *) malloc(sizeof *dir)) != 0 &&
+           (dir->name = (char *) malloc(base_length + strlen(all) + 1)) != 0)
+        {
+            strcat(strcpy(dir->name, name), all);
+
+            if((dir->handle =
+                (handle_type) _findfirst(dir->name, &dir->info)) != -1)
+            {
+                dir->result.d_name = 0;
+            }
+            else /* rollback */
+            {
+                free(dir->name);
+                free(dir);
+                dir = 0;
+            }
+        }
+        else /* rollback */
+        {
+            free(dir);
+            dir   = 0;
+            errno = ENOMEM;
+        }
+    }
+    else
+    {
+        errno = EINVAL;
+    }
+
+    return dir;
+}
+
+int closedir(DIR *dir)
+{
+    int result = -1;
+
+    if(dir)
+    {
+        if(dir->handle != -1)
+        {
+            result = _findclose(dir->handle);
+        }
+
+        free(dir->name);
+        free(dir);
+    }
+
+    if(result == -1) /* map all errors to EBADF */
+    {
+        errno = EBADF;
+    }
+
+    return result;
+}
+
+struct dirent *readdir(DIR *dir)
+{
+    struct dirent *result = 0;
+
+    if(dir && dir->handle != -1)
+    {
+        if(!dir->result.d_name || _findnext(dir->handle, &dir->info) != -1)
+        {
+            result         = &dir->result;
+            result->d_name = dir->info.name;
+        }
+    }
+    else
+    {
+        errno = EBADF;
+    }
+
+    return result;
+}
+
+void rewinddir(DIR *dir)
+{
+    if(dir && dir->handle != -1)
+    {
+        _findclose(dir->handle);
+        dir->handle = (handle_type) _findfirst(dir->name, &dir->info);
+        dir->result.d_name = 0;
+    }
+    else
+    {
+        errno = EBADF;
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+/*
+
+    Copyright Kevlin Henney, 1997, 2003, 2012. All rights reserved.
+
+    Permission to use, copy, modify, and distribute this software and its
+    documentation for any purpose is hereby granted without fee, provided
+    that this copyright and permissions notice appear in all copies and
+    derivatives.
+    
+    This software is supplied "as is" without express or implied warranty.
+
+    But that said, if there are any problems please get in touch.
+
+*/

src/win32/dirent.h

@@ -0,0 +1,50 @@
+#ifndef DIRENT_INCLUDED
+#define DIRENT_INCLUDED
+
+/*
+
+    Declaration of POSIX directory browsing functions and types for Win32.
+
+    Author:  Kevlin Henney (kevlin@acm.org, kevlin@curbralan.com)
+    History: Created March 1997. Updated June 2003.
+    Rights:  See end of file.
+    
+*/
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+typedef struct DIR DIR;
+
+struct dirent
+{
+    char *d_name;
+};
+
+DIR           *opendir(const char *);
+int           closedir(DIR *);
+struct dirent *readdir(DIR *);
+void          rewinddir(DIR *);
+
+/*
+
+    Copyright Kevlin Henney, 1997, 2003. All rights reserved.
+
+    Permission to use, copy, modify, and distribute this software and its
+    documentation for any purpose is hereby granted without fee, provided
+    that this copyright and permissions notice appear in all copies and
+    derivatives.
+    
+    This software is supplied "as is" without express or implied warranty.
+
+    But that said, if there are any problems please get in touch.
+
+*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif