win32: Add a 'git__' prefix to the directory reading routines

This reduces the global namespace pollution and allows for
a win32 compiler (eg. Open Watcom) to provide these routines
in a header other than <dirent.h> (eg in <io.h>).

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>

src/dir.h

@@ -9,7 +9,7 @@
 
 #ifdef GIT_WIN32
 
-struct dirent {
+struct git__dirent {
 	int  d_ino;
 	char d_name[261];
 };
@@ -17,15 +17,24 @@ struct dirent {
 typedef struct {
 	HANDLE h;
 	WIN32_FIND_DATA f;
-	struct dirent entry;
+	struct git__dirent entry;
 	char *dir;
 	int first;
-} DIR;
-
-extern DIR *opendir(const char *);
-extern struct dirent *readdir(DIR *);
-extern void rewinddir(DIR *);
-extern int closedir(DIR *);
+} git__DIR;
+
+extern git__DIR *git__opendir(const char *);
+extern struct git__dirent *git__readdir(git__DIR *);
+extern void git__rewinddir(git__DIR *);
+extern int git__closedir(git__DIR *);
+
+# ifndef GIT__WIN32_NO_WRAP_DIR
+#  define dirent git__dirent
+#  define DIR git__DIR
+#  define opendir   git__opendir
+#  define readdir   git__readdir
+#  define rewinddir git__rewinddir
+#  define closedir  git__closedir
+# endif
 
 #endif
 

src/win32/dir.c

+#define GIT__WIN32_NO_WRAP_DIR
 #include "dir.h"
 
 static int init_filter(char *filter, size_t n, const char *dir)
@@ -15,10 +16,10 @@ static int init_filter(char *filter, size_t n, const char *dir)
 	return 1;
 }
 
-DIR *opendir(const char *dir)
+git__DIR *git__opendir(const char *dir)
 {
 	char filter[4096];
-	DIR *new;
+	git__DIR *new;
 
 	if (!dir || !init_filter(filter, sizeof(filter), dir))
 		return NULL;
@@ -45,7 +46,7 @@ DIR *opendir(const char *dir)
 	return new;
 }
 
-struct dirent *readdir(DIR *d)
+struct git__dirent *git__readdir(git__DIR *d)
 {
 	if (!d || d->h == INVALID_HANDLE_VALUE)
 		return NULL;
@@ -66,7 +67,7 @@ struct dirent *readdir(DIR *d)
 	return &d->entry;
 }
 
-void rewinddir(DIR *d)
+void git__rewinddir(git__DIR *d)
 {
 	char filter[4096];
 
@@ -83,7 +84,7 @@ void rewinddir(DIR *d)
 	}
 }
 
-int closedir(DIR *d)
+int git__closedir(git__DIR *d)
 {
 	if (d) {
 		if (d->h != INVALID_HANDLE_VALUE)