mountmgr: Replace some malloc/sprintf/strcpy calls with asprintf.

dlls/mountmgr.sys/unixlib.c

@@ -89,22 +89,14 @@ static NTSTATUS errno_to_status( int err )
 
 static char *get_dosdevices_path( const char *dev )
 {
-    const char *home = getenv( "HOME" );
     const char *prefix = getenv( "WINEPREFIX" );
-    size_t len = (prefix ? strlen(prefix) : strlen(home) + strlen("/.wine")) + sizeof("/dosdevices/") + strlen(dev);
-    char *path = malloc( len );
+    char *path = NULL;
+
+    if (prefix)
+        asprintf( &path, "%s/dosdevices/%s", prefix, dev );
+    else
+        asprintf( &path, "%s/.wine/dosdevices/%s", getenv( "HOME" ), dev );
 
-    if (path)
-    {
-        if (prefix) strcpy( path, prefix );
-        else
-        {
-            strcpy( path, home );
-            strcat( path, "/.wine" );
-        }
-        strcat( path, "/dosdevices/" );
-        strcat( path, dev );
-    }
     return path;
 }
 
@@ -420,9 +412,9 @@ static NTSTATUS read_volume_file( void *args )
 {
     const struct read_volume_file_params *params = args;
     int ret, fd = -1;
-    char *name = malloc( strlen(params->volume) + strlen(params->file) + 2 );
+    char *name = NULL;
 
-    sprintf( name, "%s/%s", params->volume, params->file );
+    asprintf( &name, "%s/%s", params->volume, params->file );
 
     if (name[0] != '/')
     {
@@ -508,9 +500,7 @@ static NTSTATUS set_shell_folder( void *args )
     if (link && (!strcmp( link, "$HOME" ) || !strncmp( link, "$HOME/", 6 )) && (home = getenv( "HOME" )))
     {
         link += 5;
-        homelink = malloc( strlen(home) + strlen(link) + 1 );
-        strcpy( homelink, home );
-        strcat( homelink, link );
+        asprintf( &homelink, "%s%s", home, link );
         link = homelink;
     }