| 0,0 → 1,76 |
|---|
| /* |
| * echo |
| */ |
| |
| static int cmd_echo(struct cmd_funcparam *p) { |
| unsigned short offs = FP_OFF(p->cmdline) + 5; |
| unsigned short segm = FP_SEG(p->cmdline); |
| unsigned char far *echostatus = MK_FP(p->rmod_seg, RMOD_OFFSET_ECHOFLAG); |
| |
| /* display help only if /? is the only argument */ |
| if ((p->argc == 1) && (imatch(p->argv[0], "/?"))) { |
| outputnl("Displays messages, or turns command-echoing on or off"); |
| outputnl(""); |
| outputnl("ECHO [ON | OFF]"); |
| outputnl("ECHO [message]"); |
| outputnl(""); |
| outputnl("Type ECHO without parameters to display the current echo setting."); |
| return(-1); |
| } |
| |
| /* ECHO without any parameter: display current state */ |
| if (p->argc == 0) { |
| if (*echostatus) { |
| outputnl("ECHO is on"); |
| } else { |
| outputnl("ECHO is off"); |
| } |
| return(-1); |
| } |
| |
| /* ECHO ON */ |
| if ((p->argc == 1) && (imatch(p->argv[0], "on"))) { |
| *echostatus = 1; |
| return(-1); |
| } |
| |
| /* ECHO OFF */ |
| if ((p->argc == 1) && (imatch(p->argv[0], "off"))) { |
| *echostatus = 0; |
| return(-1); |
| } |
| |
| /* ECHO MSG (start at cmdline+5 since first 5 are "ECHO" + separator) */ |
| _asm { |
| push ax |
| push dx |
| push ds |
| push si |
| |
| mov si, [offs] |
| cld /* clear direction flag (DF) so lodsb increments SI */ |
| mov ah, 0x02 /* display char from DL */ |
| mov ds, [segm] |
| NEXTYBTE: |
| lodsb /* load byte at DS:[SI] into AL and inc SI (if DF clear) */ |
| or al, al /* is AL == 0? then end of string reached */ |
| jz DONE |
| mov dl, al |
| int 0x21 |
| jmp NEXTYBTE |
| |
| /* output a final CR/LF */ |
| DONE: |
| mov dl, 0x0D |
| int 0x21 |
| mov dl, 0x0A |
| int 0x21 |
| |
| pop si |
| pop ds |
| pop dx |
| pop ax |
| } |
| |
| return(-1); |
| } |