1 files changed, 117 insertions, 0 deletions

diff --git a/v4.0/src/MAPPER/EXECPGM.ASM b/v4.0/src/MAPPER/EXECPGM.ASM
new file mode 100644
index 0000000..738b950
--- /dev/null
+++ b/v4.0/src/MAPPER/EXECPGM.ASM
@@ -0,0 +1,117 @@
+;
+page 60,132
+;
+title CP/DOS  DOSExecPrg  mapper
+
+buffer  segment word public 'buffer'
+                        public  DosExecPgmCalled
+DosExecPgmCalled        db      0                         ;????????????
+                        public  DosExecPgmReturnCode
+DosExecPgmReturnCode    dw      0
+
+DosExecParameterBlock   label   word
+EnvironmentSegment      dw      0
+ArgumentPointer         dd      0
+Default_5C_FCB          dd      0
+Default_6C_FCB          dd      0
+
+buffer  ends
+
+dosxxx  segment byte public 'dos'
+        assume  cs:dosxxx,ds:nothing,es:nothing,ss:nothing
+;
+; ************************************************************************* *
+; *
+; *      MODULE: DosExecPgm
+; *
+; *      FUNCTION:  Allows a program to execute another program
+; *
+; *      CALLING SEQUENCE:
+; *
+; *             push    Asyncindic      ; execute asynchronously
+; *             push    TraceIndic      ; trace process
+; *             push    Argpointer      ; address of arguments string
+; *             push    Envpointer      ; address of environment string
+; *             push    Processid       ; address to put process id
+; *             push    PgmPointer      ; address of program filename
+; *             call    dosexecpgm
+; *
+; *      RETURN SEQUENCE:    AX = error code
+; *
+; *
+; *
+; *      MODULES CALLED:   INT 21H   function 4BH and 4DH
+; *
+; *
+; *
+; *************************************************************************
+
+        public  dosexecpgm
+        .sall
+        .xlist
+        include macros.inc
+        .list
+
+inv_parm equ 0002
+not_suf_mem equ 0004
+
+str     struc
+old_bp  dw      ?
+return  dd      ?
+Pgmpointer dd   ?       ; address of program file name
+Processid  dd   ?       ; this is used when only sync exec
+EnvPointer dd   ?       ; address of environment string
+ArgPointer dd   ?       ; address of argument string
+Traceindic dw   ?       ; ignored,  what is a trace process?
+Asyncindic dw   ?       ; ignored,  PC-DOS always waits!
+str     ends
+
+dosexecpgm proc   far                           ; push registers
+        Enter   dosexecpgm
+
+        mov     ax,seg buffer                   ; setup buffer segment
+        mov     ds,ax                           ;   and copy info into
+        assume  ds:buffer                       ;      data buffer
+
+        mov     ax,word ptr [bp+2].EnvPointer   ; seg portion only for pc-dos
+        mov     EnvironmentSegment,ax           ; copy environment string
+
+        les     di,[bp].ArgPointer
+        mov     word ptr ArgumentPointer+0,di   ; copy argument string
+        mov     word ptr ArgumentPointer+2,es
+
+        xor     ax,ax
+        mov     word ptr Default_5C_FCB+0,ax    ; setup defaults
+        mov     word ptr Default_5C_FCB+2,ax
+
+        mov     word ptr Default_6C_FCB+0,ax
+        mov     word ptr Default_6C_FCB+2,ax
+
+        mov     bx,ds
+        mov     es,bx
+        mov     bx,offset buffer:DosExecParameterBlock
+
+        lds     dx,[bp].PgmPointer         ; setup program name
+        mov     ax,4b00h
+        int     21h                        ; exec program  and
+        jc      ErrorExit                  ;   check for error
+
+        mov     ah,4dh
+        int     21h                        ; get return code of program
+        jc      ErrorExit                  ;   just executed and jump if
+                                           ;       error
+        mov     bx,seg buffer
+        mov     ds,bx
+        mov     DosExecPgmReturnCode,ax    ; else, save return code
+
+        xor     ax,ax                      ; set no error code
+
+ErrorExit:
+        Mexit                              ; pop registers
+        ret     size str - 6               ; return
+
+dosexecpgm  endp
+
+dosxxx  ends
+
+        end