Simplify nested '#ifdef' by replacing it with '#elif defined()'

p4raw-id: //depot/perl@26954

diff --git a/mg.c b/mg.c
index 8efed16..c277576 100644 (file)
--- a/mg.c
+++ b/mg.c
@@ -680,15 +680,14 @@ Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
        break;
     case '\005':  /* ^E */
         if (nextchar == '\0') {
-#ifdef MACOS_TRADITIONAL
+#if defined(MACOS_TRADITIONAL)
             {
                  char msg[256];
 
                  sv_setnv(sv,(double)gMacPerl_OSErr);
                  sv_setpv(sv, gMacPerl_OSErr ? GetSysErrText(gMacPerl_OSErr, msg) : "");
             }
-#else
-#ifdef VMS
+#elif defined(VMS)
             {
 #                include <descrip.h>
 #                include <starlet.h>
@@ -700,8 +699,7 @@ Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
                  else
                       sv_setpvn(sv,"",0);
             }
-#else
-#ifdef OS2
+#elif defined(OS2)
             if (!(_emx_env & 0x200)) { /* Under DOS */
                  sv_setnv(sv, (NV)errno);
                  sv_setpv(sv, errno ? Strerror(errno) : "");
@@ -714,8 +712,7 @@ Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
                  sv_setnv(sv, (NV)Perl_rc);
                  sv_setpv(sv, os2error(Perl_rc));
             }
-#else
-#ifdef WIN32
+#elif defined(WIN32)
             {
                  DWORD dwErr = GetLastError();
                  sv_setnv(sv, (NV)dwErr);
@@ -734,9 +731,6 @@ Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
                 errno = saveerrno;
             }
 #endif
-#endif
-#endif
-#endif
             SvRTRIM(sv);
             SvNOK_on(sv);      /* what a wonderful hack! */
         }