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+#---------------------------------------------------------------------------
+.help change_ext Jun93 xtools
+.ih
+NAME
+change_ext -- Put the specified extension on a file name.
+.ih
+USAGE
+call change_ext (in_name, newext, out_name, max_size)
+.ih
+ARGUMENTS
+.ls in_name (I: char[ARB])
+The input pathname with which to change the arguments.
+.le
+.ls newext (I: char[ARB])
+The extension to replace the original extension with.
+.le
+.ls out_name (O: char[max_size])
+The resultant pathname with the new extension inserted.  May be the
+same as the in_name.
+.le
+.ls max_size (I: int)
+The maximum length of the string out_name.
+.le
+.ih
+DESCRIPTION
+This routine replaces the old extension on a pathname with the new
+extension specified in the argument "newext".  Thus:
+
+.nf
+        dir$root.ext --> dir$root.newext
+.fi
+.ih
+SEE ALSO
+fparse
+.endhelp
+#---------------------------------------------------------------------------
+procedure change_ext (in_name, newext, out_name, max_size)
+
+char    in_name[ARB]            # I:  Original input name.
+char    newext[ARB]             # I:  Extension to replace old one.
+char    out_name[max_size]      # O:  File name with new extension.
+int     max_size                # I:  Maximum size out_name.
+
+# Misc.
+pointer dir                     # Directory part of pathname.
+int     index                   # Group index in pathname.
+pointer ksection                # Unparsable part of pathname.
+int     ngroup                  # Number of groups.
+pointer root                    # Root part of pathname.
+pointer section                 # Section part of pathname.
+pointer sp                      # Stack pointer.
+pointer sx                      # Generic string.
+
+begin
+        call smark (sp)
+        call salloc (dir, SZ_LINE, TY_CHAR)
+        call salloc (root, SZ_LINE, TY_CHAR)
+        call salloc (section, SZ_LINE, TY_CHAR)
+        call salloc (ksection, SZ_LINE, TY_CHAR)
+        call salloc (sx, SZ_LINE, TY_CHAR)
+
+        # Parse the file name COMPLETELY.
+        call fparse (in_name, Memc[dir], SZ_LINE, Memc[root], SZ_LINE,
+                     Memc[sx], SZ_LINE, index, ngroup,
+                     Memc[section], SZ_LINE, Memc[ksection], SZ_LINE)
+
+        # Put directory and root together.
+        call strcpy (Memc[dir], out_name, max_size)
+        call strcat (Memc[root], out_name, max_size)
+
+        # Change the extension.
+        call strcat (".", out_name, max_size)
+        call strcat (newext, out_name, max_size)
+
+        # Handle group syntax.
+        if (index > 0) {
+            call sprintf (Memc[sx], SZ_LINE, "[%d")
+            call pargi (index)
+            call strcat (Memc[sx], out_name, max_size)
+            if (ngroup > 0) {
+                call sprintf (Memc[sx], SZ_LINE, "/%d")
+                call pargi (ngroup)
+                call strcat (Memc[sx], out_name, max_size)
+            }
+            call strcat ("]", out_name, max_size)
+        }
+
+        # Append the "unparsable" parts.
+        call strcat (Memc[ksection], out_name, max_size)
+
+        # Finally image sections.
+        call strcat (Memc[section], out_name, max_size)
+
+        call sfree (sp)
+end
+#---------------------------------------------------------------------------
+# End of change_ext
+#---------------------------------------------------------------------------