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/* 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.
*/
/*
* time [time]
*/
/* read a one or two digit number and write it to buff */
static int cmd_time_get_item(char *buff, const char *s) {
unsigned short i;
for (i = 0; i < 3; i++) {
if ((s[i] < '0') || (s[i] > '9')) {
buff[i] = 0;
return(0);
}
buff[i] = s[i];
}
/* err */
*buff = 0;
return(-1);
}
/* parse a NULL-terminated string int hour, minutes and seconds, returns 0 on success
* valid inputs: 0, 7, 5:5, 23:23, 17:54:45, 9p, 9:05, ...
*/
static int cmd_time_parse(const char *s, signed char *ho, signed char *mi, signed char *se, struct nls_patterns *nls) {
unsigned short i;
const char *ptrs[2] = {NULL, NULL}; /* minutes, seconds */
char buff[3];
char ampm = 0;
*ho = -1;
*mi = 0;
*se = 0;
/* validate input - must contain only chars 0-9, time separator and 'a' or 'p' */
for (i = 0; s[i] != 0; i++) {
switch (s[i]) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
break;
case 'a':
case 'A':
case 'p':
case 'P':
/* these can be only at last position and never at the first */
if ((s[i + 1] != 0) || (i == 0)) return(-1);
ampm = s[i];
if (ampm >= 'a') ampm -= ('a' - 'A');
break;
default:
if ((s[i] != nls->timesep[0]) || (i == 0)) return(-1);
if (ptrs[0] == NULL) {
ptrs[0] = s + i + 1;
} else if (ptrs[1] == NULL) {
ptrs[1] = s + i + 1;
} else { /* too many separators */
return(-1);
}
break;
}
}
/* read hour */
if (cmd_time_get_item(buff, s) != 0) goto FAIL;
if (atous(&i, buff) != 0) goto FAIL;
*ho = i;
/* if minutes provided, read them */
if (ptrs[0] != NULL) {
if (cmd_time_get_item(buff, ptrs[0]) != 0) goto FAIL;
if (atous(&i, buff) != 0) goto FAIL;
*mi = i;
}
/* if seconds provided, read them */
if (ptrs[1] != NULL) {
if (cmd_time_get_item(buff, ptrs[1]) != 0) goto FAIL;
if (atous(&i, buff) != 0) goto FAIL;
*se = i;
}
/* validate ranges */
if ((*ho > 23) || (*mi > 59) || (*se > 59)) goto FAIL;
/* am? */
if ((ampm == 'A') && (*ho > 12)) goto FAIL;
if ((ampm == 'A') && (*ho == 12)) *ho = 0; /* 12:00am is 00:00 (midnight) */
/* pm? */
if (ampm == 'P') {
if (*ho > 12) goto FAIL;
if (*ho < 12) *ho += 12;
}
return(0);
FAIL:
*ho = -1;
return(-1);
}
static enum cmd_result cmd_time(struct cmd_funcparam *p) {
struct nls_patterns *nls = (void *)(p->BUFFER);
char *buff = p->BUFFER + sizeof(*nls);
unsigned short i;
signed char ho = -1, mi = -1, se = -1;
if (cmd_ishlp(p)) {
nls_outputnl(22,0); /* "Displays or sets the system time." */
outputnl("");
nls_outputnl(22,1); /* "TIME [time]" */
outputnl("");
nls_outputnl(22,2); /* "Type TIME with no parameters to display the current time and (...)" */
return(CMD_OK);
}
i = nls_getpatterns(nls);
if (i != 0) {
nls_outputnl_doserr(i);
return(CMD_FAIL);
}
/* display current time if no args */
if (p->argc == 0) {
/* get cur time */
_asm {
push ax
push bx
push cx
push dx
mov ah, 0x2c /* DOS 1+ -- Query DOS Time */
int 0x21 /* CH=hour CL=minutes DH=seconds DL=1/100sec */
mov [ho], ch
mov [mi], cl
mov [se], dh
pop dx
pop cx
pop bx
pop ax
}
buff[0] = ' ';
nls_format_time(buff + 1, ho, mi, se, nls);
nls_output(22,3); /* "Current time is" */
outputnl(buff);
ho = -1;
} else { /* parse time if provided */
if (cmd_time_parse(p->argv[0], &ho, &mi, &se, nls) != 0) {
nls_outputnl(22,4); /* "Invalid time" */
ho = -1;
}
}
/* ask for time if not provided or if input was malformed */
while (ho < 0) {
nls_output(22,5); /* "Enter new time:" */
output(" ");
/* collect user input into buff */
_asm {
push ax
push bx
push dx
mov ah, 0x0a /* DOS 1+ -- Buffered String Input */
mov bx, buff
mov dx, bx
mov al, 16
mov [bx], al /* max input length */
mov al, 1
mov [bx+1], al /* zero out the "previous entry" length */
int 0x21
/* terminate the string with a NULL terminator */
xor ax, ax
inc bx
mov al, [bx] /* read length of input string */
mov bx, ax
add bx, dx
mov [bx+2], ah
/* output a \n */
mov ah, 2
mov dl, 0x0A
int 0x21
pop dx
pop bx
pop ax
}
if (buff[1] == 0) break; /* empty string = do not change time */
if (cmd_time_parse(buff + 2, &ho, &mi, &se, nls) == 0) break;
nls_outputnl(22,4); /* "Invalid time" */
return(CMD_FAIL);
}
if (ho >= 0) {
/* set time */
_asm {
push ax
push bx
push cx
push dx
mov ah, 0x2d /* DOS 1+ -- Set DOS Time */
mov ch, [ho] /* hour (0-23) */
mov cl, [mi] /* minutes (0-59) */
mov dh, [se] /* seconds (0-59) */
mov dl, 0 /* 1/100th seconds (0-99) */
int 0x21
pop dx
pop cx
pop bx
pop ax
}
}
return(CMD_OK);
}