apinames: Fix a buffer overrun for VMS platform.

Some output formats may rewrite symbol names during the output,
like the concatenation of "64__" suffix on VMS.  To estimate
sufficient size to store symbol name, pass the output format
info to `names_add`.  For VMS, `names_add` allocates longer
buffer to append "64__".

* apinames.c (SUFFIX_VMS_64ADDR): New macro of "64__".
(main): Pass the format info to `read_header_file`.
(read_header_file): Pass the format info to `names_add`.
(names_add): Receive the format info, and reserve the symbol
name buffer 4 byte longer in the case of VMS, to append the
suffix in `names_dump`.

src/tools/apinames.c

@@ -42,6 +42,7 @@ typedef enum  OutputFormat_
 
 } OutputFormat;
 
+#define SUFFIX_VMS_64ADDR "64__"
 
 static void
 panic( const char*  fmt,
@@ -76,11 +77,12 @@ static int   max_names;
 
 
 static void
-names_add( const char*  name,
-           const char*  end )
+names_add( const char*   name,
+           const char*   end,
+           OutputFormat  format )
 {
   unsigned int  h;
-  int           nn, len;
+  int           nn, len, len_suffix;
   Name          nm;
 
 
@@ -116,8 +118,18 @@ names_add( const char*  name,
   }
   nm = &the_names[num_names++];
 
+  switch ( format )
+  {
+  case OUTPUT_VMS_OPT:
+    /* VMS mode would join the symbol name with a suffix */
+    len_suffix = sizeof ( SUFFIX_VMS_64ADDR );
+    break;
+  default:
+    len_suffix = 0;
+  }
+
   nm->hash = h;
-  nm->name = (char*)malloc( len + 1 );
+  nm->name = (char*)malloc( len + len_suffix + 1 );
   if ( !nm->name )
     panic( "not enough memory" );
 
@@ -229,7 +241,7 @@ names_dump( FILE*         out,
 
       /* Also emit a 64-bit symbol, as created by the `vms_auto64` tool. */
       /* It has the string '64__' appended to its name.                  */
-      strcat( the_names[nn].name , "64__" );
+      strcat( the_names[nn].name , SUFFIX_VMS_64ADDR );
       if ( vms_shorten_symbol( the_names[nn].name, short_symbol, 1 ) == -1 )
         panic( "could not shorten name '%s'", the_names[nn].name );
       fprintf( out, "symbol_vector = ( %s = PROCEDURE)\n", short_symbol );
@@ -277,8 +289,9 @@ typedef enum  State_
 
 
 static int
-read_header_file( FILE*  file,
-                  int    verbose )
+read_header_file( FILE*         file,
+                  int           verbose,
+                  OutputFormat  format )
 {
   static char  buff[LINEBUFF_SIZE + 1];
   State        state = STATE_START;
@@ -350,7 +363,7 @@ read_header_file( FILE*  file,
           if ( verbose )
             fprintf( stderr, ">>> %.*s\n", (int)( p - name ), name );
 
-          names_add( name, p );
+          names_add( name, p, format );
         }
 
         state = STATE_START;
@@ -519,7 +532,7 @@ main( int                 argc,
   } /* end of while loop */
 
   if ( from_stdin )
-    read_header_file( stdin, verbose );
+    read_header_file( stdin, verbose, format );
   else
   {
     for ( --argc, argv++; argc > 0; argc--, argv++ )
@@ -534,7 +547,7 @@ main( int                 argc,
         if ( verbose )
           fprintf( stderr, "opening '%s'\n", argv[0] );
 
-        read_header_file( file, verbose );
+        read_header_file( file, verbose, format );
         fclose( file );
       }
     }