WebSVN – SvarDOS – Diff – /svarcom/trunk/cmd/echo.c


/* This file is part of the SvarCOM project and is published under the terms
 * of the MIT license.
 *
 * Copyright (C) 2021 Mateusz Viste
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
/*
 * echo
 */
 
static int cmd_echo(struct cmd_funcparam *p) {
  unsigned short offs = FP_OFF(p->cmdline) + 5;
  unsigned short segm = FP_SEG(p->cmdline);
 
  /* 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 (p->rmod->flags & FLAG_ECHOFLAG) {
      outputnl("ECHO is on");
    } else {
      outputnl("ECHO is off");
    }
    return(-1);
  }
 
  /* ECHO ON */
  if ((p->argc == 1) && (imatch(p->argv[0], "on"))) {
    p->rmod->flags |= FLAG_ECHOFLAG;
    return(-1);
  }
 
  /* ECHO OFF */
  if ((p->argc == 1) && (imatch(p->argv[0], "off"))) {
    p->rmod->flags &= ~FLAG_ECHOFLAG;
    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);
}
 

Rev 450	Rev 475
1	`/* This file is part of the SvarCOM project and is published under the terms`	1	`/* This file is part of the SvarCOM project and is published under the terms`
2	`* of the MIT license.`	2	`* of the MIT license.`
3	`*`	3	`*`
4	`* Copyright (C) 2021 Mateusz Viste`	4	`* Copyright (C) 2021 Mateusz Viste`
5	`*`	5	`*`
6	`* Permission is hereby granted, free of charge, to any person obtaining a`	6	`* Permission is hereby granted, free of charge, to any person obtaining a`
7	`* copy of this software and associated documentation files (the "Software"),`	7	`* copy of this software and associated documentation files (the "Software"),`
8	`* to deal in the Software without restriction, including without limitation`	8	`* to deal in the Software without restriction, including without limitation`
9	`* the rights to use, copy, modify, merge, publish, distribute, sublicense,`	9	`* the rights to use, copy, modify, merge, publish, distribute, sublicense,`
10	`* and/or sell copies of the Software, and to permit persons to whom the`	10	`* and/or sell copies of the Software, and to permit persons to whom the`
11	`* Software is furnished to do so, subject to the following conditions:`	11	`* Software is furnished to do so, subject to the following conditions:`
12	`*`	12	`*`
13	`* The above copyright notice and this permission notice shall be included in`	13	`* The above copyright notice and this permission notice shall be included in`
14	`* all copies or substantial portions of the Software.`	14	`* all copies or substantial portions of the Software.`
15	`*`	15	`*`
16	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	16	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
17	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	17	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
18	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	18	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
19	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	19	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
20	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	20	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
21	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER`	21	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER`
22	`* DEALINGS IN THE SOFTWARE.`	22	`* DEALINGS IN THE SOFTWARE.`
23	`*/`	23	`*/`
24		24
25	`/*`	25	`/*`
26	`* echo`	26	`* echo`
27	`*/`	27	`*/`
28		28
29	`static int cmd_echo(struct cmd_funcparam *p) {`	29	`static int cmd_echo(struct cmd_funcparam *p) {`
30	`unsigned short offs = FP_OFF(p->cmdline) + 5;`	30	`unsigned short offs = FP_OFF(p->cmdline) + 5;`
31	`unsigned short segm = FP_SEG(p->cmdline);`	31	`unsigned short segm = FP_SEG(p->cmdline);`
32		32
33	`/* display help only if /? is the only argument */`	33	`/* display help only if /? is the only argument */`
34	`if ((p->argc == 1) && (imatch(p->argv[0], "/?"))) {`	34	`if ((p->argc == 1) && (imatch(p->argv[0], "/?"))) {`
35	`outputnl("Displays messages, or turns command-echoing on or off");`	35	`outputnl("Displays messages, or turns command-echoing on or off");`
36	`outputnl("");`	36	`outputnl("");`
37	`outputnl("ECHO [ON \| OFF]");`	37	`outputnl("ECHO [ON \| OFF]");`
38	`outputnl("ECHO [message]");`	38	`outputnl("ECHO [message]");`
39	`outputnl("");`	39	`outputnl("");`
40	`outputnl("Type ECHO without parameters to display the current echo setting.");`	40	`outputnl("Type ECHO without parameters to display the current echo setting.");`
41	`return(-1);`	41	`return(-1);`
42	`}`	42	`}`
43		43
44	`/* ECHO without any parameter: display current state */`	44	`/* ECHO without any parameter: display current state */`
45	`if (p->argc == 0) {`	45	`if (p->argc == 0) {`
46	`if (p->rmod->echoflag) {`	46	`if (p->rmod->flags & FLAG_ECHOFLAG) {`
47	`outputnl("ECHO is on");`	47	`outputnl("ECHO is on");`
48	`} else {`	48	`} else {`
49	`outputnl("ECHO is off");`	49	`outputnl("ECHO is off");`
50	`}`	50	`}`
51	`return(-1);`	51	`return(-1);`
52	`}`	52	`}`
53		53
54	`/* ECHO ON */`	54	`/* ECHO ON */`
55	`if ((p->argc == 1) && (imatch(p->argv[0], "on"))) {`	55	`if ((p->argc == 1) && (imatch(p->argv[0], "on"))) {`
56	`p->rmod->echoflag = 1;`	56	`p->rmod->flags \|= FLAG_ECHOFLAG;`
57	`return(-1);`	57	`return(-1);`
58	`}`	58	`}`
59		59
60	`/* ECHO OFF */`	60	`/* ECHO OFF */`
61	`if ((p->argc == 1) && (imatch(p->argv[0], "off"))) {`	61	`if ((p->argc == 1) && (imatch(p->argv[0], "off"))) {`
62	`p->rmod->echoflag = 0;`	62	`p->rmod->flags &= ~FLAG_ECHOFLAG;`
63	`return(-1);`	63	`return(-1);`
64	`}`	64	`}`
65		65
66	`/* ECHO MSG (start at cmdline+5 since first 5 are "ECHO" + separator) */`	66	`/* ECHO MSG (start at cmdline+5 since first 5 are "ECHO" + separator) */`
67	`_asm {`	67	`_asm {`
68	`push ax`	68	`push ax`
69	`push dx`	69	`push dx`
70	`push ds`	70	`push ds`
71	`push si`	71	`push si`
72		72
73	`mov si, [offs]`	73	`mov si, [offs]`
74	`cld /* clear direction flag (DF) so lodsb increments SI */`	74	`cld /* clear direction flag (DF) so lodsb increments SI */`
75	`mov ah, 0x02 /* display char from DL */`	75	`mov ah, 0x02 /* display char from DL */`
76	`mov ds, [segm]`	76	`mov ds, [segm]`
77	`NEXTYBTE:`	77	`NEXTYBTE:`
78	`lodsb /* load byte at DS:[SI] into AL and inc SI (if DF clear) */`	78	`lodsb /* load byte at DS:[SI] into AL and inc SI (if DF clear) */`
79	`or al, al /* is AL == 0? then end of string reached */`	79	`or al, al /* is AL == 0? then end of string reached */`
80	`jz DONE`	80	`jz DONE`
81	`mov dl, al`	81	`mov dl, al`
82	`int 0x21`	82	`int 0x21`
83	`jmp NEXTYBTE`	83	`jmp NEXTYBTE`
84		84
85	`/* output a final CR/LF */`	85	`/* output a final CR/LF */`
86	`DONE:`	86	`DONE:`
87	`mov dl, 0x0D`	87	`mov dl, 0x0D`
88	`int 0x21`	88	`int 0x21`
89	`mov dl, 0x0A`	89	`mov dl, 0x0A`
90	`int 0x21`	90	`int 0x21`
91		91
92	`pop si`	92	`pop si`
93	`pop ds`	93	`pop ds`
94	`pop dx`	94	`pop dx`
95	`pop ax`	95	`pop ax`
96	`}`	96	`}`
97		97
98	`return(-1);`	98	`return(-1);`
99	`}`	99	`}`
100		100

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd/echo.c @ 533 – Rev 450 → 475