add underscores to _poserror and _stroserror

include/stdio.h

@@ -147,7 +147,11 @@ int __fastcall__ vfscanf (FILE* f, const char* format, __va_list ap);
 FILE* __fastcall__ fdopen (int fd, const char* mode);   /* Unix */
 int __fastcall__ fileno (FILE* f);                      /* Unix */
 #endif
-void __fastcall__ _poserror (const char* msg);          /* cc65 */
+void __fastcall__ __poserror (const char* msg);          /* cc65 */
+#if __CC65_STD__ == __CC65_STD_CC65__
+/* define old name with one underscore for backwards compatibility */
+#define _poserror __poserror
+#endif
 
 /* Masking macros for some functions */
 #define getc(f)         fgetc (f)               /* ANSI */

libsrc/common/_poserror.c

@@ -39,10 +39,10 @@
 
 
 
-void __fastcall__ _poserror (const char* msg)
+void __fastcall__ __poserror (const char* msg)
 {
     /* Fetch the message that corresponds to _oserror */
-    const char* errormsg = _stroserror (_oserror);
+    const char* errormsg = __stroserror (_oserror);
 
     /* Different output depending on msg */
     if (msg) {

libsrc/common/stroserr.s

@@ -1,11 +1,11 @@
 ;
 ; Ullrich von Bassewitz, 17.07.2002
 ;
-; const char* __fastcall__ _stroserror (unsigned char errcode);
+; const char* __fastcall__ __stroserror (unsigned char errcode);
 ; /* Map an operating system error number to an error message. */
 ;
 
-        .export         __stroserror
+        .export         ___stroserror
         .import         __sys_oserrlist
         .importzp       ptr1, tmp1
 
@@ -21,7 +21,7 @@
 ; and terminated by an entry with length zero that is returned if the
 ; error code could not be found.
 
-__stroserror:
+___stroserror:
         sta     tmp1                    ; Save the error code
 
         ldy     #<__sys_oserrlist

libsrc/geos-common/common/_poserror.c

@@ -9,9 +9,9 @@
 #include <errno.h>
 #include <geos.h>
 
-void __fastcall__ _poserror (const char* msg)
+void __fastcall__ __poserror (const char* msg)
 {
-    const char *errmsg = _stroserror(_oserror);
+    const char *errmsg = __stroserror(_oserror);
 
     ExitTurbo();
     if (msg && *msg) {