Using a Macro to Determine the Current Segment

ID: Q58864

The information in this article applies to:

Microsoft Macro Assembler for MS-DOS, versions 5.1, 5.1a

SUMMARY

The following macro can be used to determine the segment from which the macro is called during assembly of a source file.

In the following example, the "findseg" macro is called from within two individual segments named code1 and code2, respectively. The macro then uses IF statements to determine the segment. Then, depending upon the segment, any desired code can be assembled.


        findseg macro segname
          ifidn <code1>, <segname> ; if in segment code1
                  :                ; do what is desired
          endif

          ifidn <code2>, <segname> ; if in segment code2
                  :                ; do what is desired
          endif
          endm                     ; end macro


          findseg code1   ;macro call in segment code1
                     .
                     .
                     .
          findseg code2   ;macro call in segment code2

Note that invoking the findseg macro with the @curseg equate as a macro argument will not yield a true condition for the ifidn expression. The value of "segname" is resolved to the string "@curseg" which, in the example, is identical to "code1".

Additional query words: 5.10 5.10a

Keywords :
Version : :5.1,5.1a
Platform :
Issue type :