Merge pull request #30 from philbudne/master

more shell work: can run "cat" (requires modified a7out)

src/other/sh.s

@@ -28,6 +28,8 @@ newcom:
    dzm argv0			" clear out argv0 for chdir comparison
    dzm argv0+1
    dzm argv0+2
+   lac argcptr
+   dac argptr
    lac iopt			" reset output pointer
    dac opt
    dac nextarg
@@ -106,7 +108,9 @@ eoname:
    sza
     jmp 1f			" last name was a redirect file, skip increment
 
-   isz argc			" increment argc
+   lac argc			" increment argc
+   tad d4
+   dac argc
    lac nextarg
    tad d4			" advance nextarg
    dac nextarg
@@ -242,19 +246,16 @@ error:			" here for error in child: filename pointer in AC
   lac d1; sys write; qmsp; 1
   lac d1; sys write; 1: 0; 4
   lac d1; sys write; nl; 1
-" XXX smes to parent???
   lac d2; sys close
   sys exit
 
 " end code from init.s
 " ================
 
+" here in parent, child pid in AC
 parent:
-   dac pid
+"  sys smes		" hangs until child exits
-1: sys rmes
-   sad pid
    jmp newline
-   jmp 1b
 
 " chdir command:
 changedir:
@@ -389,6 +390,8 @@ outfilep: outfile
 outfile: .=.+4			" buffer for output redirect file name
 infile: .=.+4			" buffer for input redirect file name
 
+argcptr: argc
+
 " leave room for maxargs items of 4 words each
 maxargs=8
 

tools/as7

@@ -213,7 +213,7 @@ elsif ($format eq 'list') {
     dump_labels($OUT);
 }
 elsif ($format eq 'ptr') {	# dump absolute memory in PTR binary
-    for my $loc ( 0 .. $#Mem ) {
+    for my $loc ( $Var{'..'} .. $#Mem ) {
 	punch($Mem[$loc] || 0);
     }
 }