*** empty log message ***

[gnulib.git] / lib / localcharset.c

diff --git a/lib/localcharset.c b/lib/localcharset.c
index 86f43b5..e80a2c5 100644 (file)
--- a/lib/localcharset.c
+++ b/lib/localcharset.c
@@ -45,9 +45,17 @@
 # endif
 #endif
 
+#include "path-concat.h"
+
 char *xmalloc ();
 char *xrealloc ();
 
+/* The following static variable is declared 'volatile' to avoid a
+   possible multithread problem in the function get_charset_aliases. If we
+   are running in a threaded environment, and if two threads initialize
+   'charset_aliases' simultaneously, both will produce the same value,
+   and everything will be ok if the two assignments to 'charset_aliases'
+   are atomic. But I don't know what will happen if the two assignments mix.  */
 /* Pointer to the contents of the charset.alias file, if it has already been
    read, else NULL.  Its format is:
    ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0'  */
@@ -63,10 +71,10 @@ get_charset_aliases ()
   if (cp == NULL)
     {
       FILE *fp;
+      char *file_name = path_concat (LIBDIR, "charset.alias", NULL);
 
-      fp = fopen (LIBDIR "/" "charset.alias", "r");
-      if (fp == NULL)
-       /* File not found, treat it as empty.  */
+      if (file_name == NULL || (fp = fopen (file_name, "r")) == NULL)
+       /* Out of memory or file not found, treat it as empty.  */
        cp = "";
       else
        {
@@ -124,6 +132,8 @@ get_charset_aliases ()
        }
 
       charset_aliases = cp;
+      if (file_name != NULL)
+       free (file_name);
     }
 
   return cp;