| 15,6 → 15,11 |
|---|
| * installs it by creating a new PSP, set int 22 vector to the routine, set my "parent PSP" to the routine |
| * and quit. |
| * |
| * |
| * |
| * good lecture about PSP and allocating memory |
| * https://retrocomputing.stackexchange.com/questions/20001/how-much-of-the-program-segment-prefix-area-can-be-reused-by-programs-with-impun/20006#20006 |
| * |
| * PSP structure |
| * http://www.piclist.com/techref/dos/psps.htm |
| * |
| 278,14 → 283,14 |
|---|
| |
| for (;;) { |
| char far *cmdline = MK_FP(rmod_seg, RMOD_OFFSET_INPBUFF + 2); |
| unsigned char far *echostatus = MK_FP(rmod_seg, RMOD_OFFSET_ECHOFLAG); |
| |
| if (*echostatus != 0) outputnl(""); /* terminate the previous command with a CR/LF */ |
| /* revert input history terminator to \r */ |
| if (cmdline[-1] != 0) { |
| cmdline[(unsigned short)(cmdline[-1])] = '\r'; |
| } |
| |
| SKIP_NEWLINE: |
| |
| /* print shell prompt (only if ECHO is enabled) */ |
| if (*echostatus != 0) { |
| { |
| /* print shell prompt */ |
| char *promptptr = BUFFER; |
| buildprompt(promptptr, *rmod_envseg); |
| _asm { |
| 299,11 → 304,6 |
|---|
| } |
| } |
| |
| /* revert input history terminator to \r */ |
| if (cmdline[-1] != 0) { |
| cmdline[(unsigned short)(cmdline[-1])] = '\r'; |
| } |
| |
| /* wait for user input */ |
| _asm { |
| push ax |
| 336,13 → 336,6 |
|---|
| int 0x2f |
| |
| DONE: |
| /* terminate command with a CR/LF */ |
| mov ah, 0x02 /* display character in dl */ |
| mov dl, 0x0d |
| int 0x21 |
| mov dl, 0x0a |
| int 0x21 |
| |
| pop ds |
| pop dx |
| pop cx |
| 349,9 → 342,10 |
|---|
| pop bx |
| pop ax |
| } |
| outputnl(""); |
| |
| /* if nothing entered, loop again (but without appending an extra CR/LF) */ |
| if (cmdline[-1] == 0) goto SKIP_NEWLINE; |
| /* if nothing entered, loop again */ |
| if (cmdline[-1] == 0) continue; |
| |
| /* replace \r by a zero terminator */ |
| cmdline[(unsigned char)(cmdline[-1])] = 0; |
| 370,10 → 364,11 |
|---|
| |
| /* try matching (and executing) an internal command */ |
| { |
| int ecode = cmd_process(rmod_seg, *rmod_envseg, cmdline, BUFFER); |
| int ecode = cmd_process(*rmod_envseg, cmdline, BUFFER); |
| if (ecode >= 0) *lastexitcode = ecode; |
| if (ecode >= -1) { /* internal command executed */ |
| redir_revert(); /* revert stdout (in case it was redirected) */ |
| outputnl(""); |
| continue; |
| } |
| } |