WebSVN – SvarDOS – Diff – /svarcom/tags/svarcom-2023.1/cmd/echo.c


/* This file is part of the SvarCOM project and is published under the terms
 * of the MIT license.
 *
 * Copyright (C) 2021-2022 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 enum cmd_result cmd_echo(struct cmd_funcparam *p) {
  const char *arg = p->cmdline + 5;
 
  /* display help only if /? is the only argument */
  if ((p->argc == 1) && (imatch(p->argv[0], "/?"))) {
    nls_outputnl(31,0); /* "Displays messages, or turns command-echoing on or off" */
    outputnl("");
    outputnl("ECHO [ON | OFF]");
    nls_outputnl(31,1); /* "ECHO [message]" */
    outputnl("");
    nls_outputnl(31,2); /* "Type ECHO without parameters to display the current setting." */
    return(CMD_OK);
  }
 
  /* ECHO without any parameter: display current state */
  if (p->argc == 0) {
    if (p->rmod->flags & FLAG_ECHOFLAG) {
      nls_outputnl(31,3); /* "ECHO is on" */
    } else {
      nls_outputnl(31,4); /* "ECHO is off" */
    }
    return(CMD_OK);
  }
 
  /* ECHO ON */
  if ((p->argc == 1) && (imatch(p->argv[0], "on"))) {
    p->rmod->flags |= FLAG_ECHOFLAG;
    return(CMD_OK);
  }
 
  /* ECHO OFF */
  if ((p->argc == 1) && (imatch(p->argv[0], "off"))) {
    p->rmod->flags &= ~FLAG_ECHOFLAG;
    return(CMD_OK);
  }
 
  /* ECHO MSG (start at cmdline+5 since first 5 are "ECHO" + separator) */
  _asm {
    push ax
    push dx
    push si
 
    mov si, [arg]
    cld           /* clear direction flag (DF) so lodsb increments SI */
    mov ah, 0x02  /* display char from DL */
    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 dx
    pop ax
  }
 
  return(CMD_OK);
}
 

Rev 989	Rev 1203
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) 2021-2022 Mateusz Viste`	4	`* Copyright (C) 2021-2022 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 enum cmd_result cmd_echo(struct cmd_funcparam *p) {`	29	`static enum cmd_result cmd_echo(struct cmd_funcparam *p) {`
30	`const char *arg = p->cmdline + 5;`	30	`const char *arg = p->cmdline + 5;`
31		31
32	`/* display help only if /? is the only argument */`	32	`/* display help only if /? is the only argument */`
33	`if ((p->argc == 1) && (imatch(p->argv[0], "/?"))) {`	33	`if ((p->argc == 1) && (imatch(p->argv[0], "/?"))) {`
34	`nls_outputnl(31,0); /* "Displays messages, or turns command-echoing on or off" */`	34	`nls_outputnl(31,0); /* "Displays messages, or turns command-echoing on or off" */`
35	`outputnl("");`	35	`outputnl("");`
36	`outputnl("ECHO [ON \| OFF]");`	36	`outputnl("ECHO [ON \| OFF]");`
37	`nls_outputnl(31,1); /* "ECHO [message]" */`	37	`nls_outputnl(31,1); /* "ECHO [message]" */`
38	`outputnl("");`	38	`outputnl("");`
39	`nls_outputnl(31,2); /* "Type ECHO without parameters to display the current setting." */`	39	`nls_outputnl(31,2); /* "Type ECHO without parameters to display the current setting." */`
40	`return(CMD_OK);`	40	`return(CMD_OK);`
41	`}`	41	`}`
42		42
43	`/* ECHO without any parameter: display current state */`	43	`/* ECHO without any parameter: display current state */`
44	`if (p->argc == 0) {`	44	`if (p->argc == 0) {`
45	`if (p->rmod->flags & FLAG_ECHOFLAG) {`	45	`if (p->rmod->flags & FLAG_ECHOFLAG) {`
46	`nls_outputnl(31,3); /* "ECHO is on" */`	46	`nls_outputnl(31,3); /* "ECHO is on" */`
47	`} else {`	47	`} else {`
48	`nls_outputnl(31,4); /* "ECHO is off" */`	48	`nls_outputnl(31,4); /* "ECHO is off" */`
49	`}`	49	`}`
50	`return(CMD_OK);`	50	`return(CMD_OK);`
51	`}`	51	`}`
52		52
53	`/* ECHO ON */`	53	`/* ECHO ON */`
54	`if ((p->argc == 1) && (imatch(p->argv[0], "on"))) {`	54	`if ((p->argc == 1) && (imatch(p->argv[0], "on"))) {`
55	`p->rmod->flags \|= FLAG_ECHOFLAG;`	55	`p->rmod->flags \|= FLAG_ECHOFLAG;`
56	`return(CMD_OK);`	56	`return(CMD_OK);`
57	`}`	57	`}`
58		58
59	`/* ECHO OFF */`	59	`/* ECHO OFF */`
60	`if ((p->argc == 1) && (imatch(p->argv[0], "off"))) {`	60	`if ((p->argc == 1) && (imatch(p->argv[0], "off"))) {`
61	`p->rmod->flags &= ~FLAG_ECHOFLAG;`	61	`p->rmod->flags &= ~FLAG_ECHOFLAG;`
62	`return(CMD_OK);`	62	`return(CMD_OK);`
63	`}`	63	`}`
64		64
65	`/* ECHO MSG (start at cmdline+5 since first 5 are "ECHO" + separator) */`	65	`/* ECHO MSG (start at cmdline+5 since first 5 are "ECHO" + separator) */`
66	`_asm {`	66	`_asm {`
67	`push ax`	67	`push ax`
68	`push dx`	68	`push dx`
69	`push si`	69	`push si`
70		70
71	`mov si, [arg]`	71	`mov si, [arg]`
72	`cld /* clear direction flag (DF) so lodsb increments SI */`	72	`cld /* clear direction flag (DF) so lodsb increments SI */`
73	`mov ah, 0x02 /* display char from DL */`	73	`mov ah, 0x02 /* display char from DL */`
74	`NEXTYBTE:`	74	`NEXTYBTE:`
75	`lodsb /* load byte at DS:[SI] into AL and inc SI (if DF clear) */`	75	`lodsb /* load byte at DS:[SI] into AL and inc SI (if DF clear) */`
76	`or al, al /* is AL == 0? then end of string reached */`	76	`or al, al /* is AL == 0? then end of string reached */`
77	`jz DONE`	77	`jz DONE`
78	`mov dl, al`	78	`mov dl, al`
79	`int 0x21`	79	`int 0x21`
80	`jmp NEXTYBTE`	80	`jmp NEXTYBTE`
81		81
82	`/* output a final CR/LF */`	82	`/* output a final CR/LF */`
83	`DONE:`	83	`DONE:`
84	`mov dl, 0x0D`	84	`mov dl, 0x0D`
85	`int 0x21`	85	`int 0x21`
86	`mov dl, 0x0A`	86	`mov dl, 0x0A`
87	`int 0x21`	87	`int 0x21`
88		88
89	`pop si`	89	`pop si`
90	`pop dx`	90	`pop dx`
91	`pop ax`	91	`pop ax`
92	`}`	92	`}`
93		93
94	`return(CMD_OK);`	94	`return(CMD_OK);`
95	`}`	95	`}`
96		96

Subversion Repositories SvarDOS

(root)/svarcom/tags/svarcom-2023.1/cmd/echo.c – Rev 989 → 1203